Статті в журналах: "Spinneret Designs"

1

Gursoy, Akin, Kamran Iranshahi, Kongchang Wei, Alexis Tello, Efe Armagan, Luciano F. Boesel, Fabien Sorin, René M. Rossi, Thijs Defraeye, and Claudio Toncelli. "Facile Fabrication of Microfluidic Chips for 3D Hydrodynamic Focusing and Wet Spinning of Polymeric Fibers." Polymers 12, no. 3 (March 10, 2020): 633. http://dx.doi.org/10.3390/polym12030633.

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Microfluidic wet spinning has gained increasing interest in recent years as an alternative to conventional wet spinning by offering higher control in fiber morphology and a gateway for the development of multi-material fibers. Conventionally, microfluidic chips used to create such fibers are fabricated by soft lithography, a method that requires both time and investment in necessary cleanroom facilities. Recently, additive manufacturing techniques were investigated for rapid and cost-efficient prototyping. However, these microfluidic devices are not yet matching the resolutions and tolerances offered by soft lithography. Herein, we report a facile and rapid method using selected arrays of hypodermic needles as templates within a silicone elastomer matrix. The produced microfluidic spinnerets display co-axially aligned circular channels. By simulation and flow experiments, we prove that these devices can maintain laminar flow conditions and achieve precise 3D hydrodynamic focusing. The devices were tested with a commercial polyurethane formulation to demonstrate that fibers with desired morphologies can be produced by varying the degree of hydrodynamic focusing. Thanks to the adaptability of this concept to different microfluidic spinneret designs—as well as to its transparency, ease of fabrication, and cost-efficient procedure—this device sets the ground for transferring microfluidic wet spinning towards industrial textile settings.

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2

Wang, Xin, Yuan Zhao, Hao Wang, and Guang Ming Cai. "Electric Field and Spinning Performance in Needleless Electrospinning." Advanced Materials Research 1048 (October 2014): 26–30. http://dx.doi.org/10.4028/www.scientific.net/amr.1048.26.

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Different spinnerets can be used to generate needleless electrospinning with the potential to scale up the production of nanofibers. However, the electrospinning performance, normally refers to the quality of the as-spun fiber and the production rate, is dramatically different from different spinnerets. This study focuses on the electric field of different spinnerets under the same experimental parameters so as to understand the key factors that affect the electrospinning performance of upward needleless electrospinning. Modeling analysis suggested that the electric field could be further concentrated by optimizing the geometry of spinneret. Experimental investigation on needleless electrospinning from different spinnerets proved that the electrospinning performance was improved greatly with the optimization of the electric field of spinneret. Understanding of the relationship between electric field and spinning performance would benefit the design and development of needleless electrospinning.

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3

Gao, Wei Jie, Xiao E. Wang, Kun Wang, Jie Fan, and Yong Liu. "Preparation of Continuous Electrospun Nanofiber Yarn with an Auxiliary Rotating Circular Plate." Applied Mechanics and Materials 423-426 (September 2013): 109–12. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.109.

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Nanofiber yarn, since it might be used in weaving and knitting, has been of great interest recently due to the potential application in many fields. A modified method to produce continuous nanofiber yarn using two oppositely spinnerets system with an auxiliary rotating circular plate is suggested in this work. The influence of process parameters, such as applied voltage, spinneret-plate distance and the angle between the two spinnerets, on the morphologies and properties of nanofiber yarn were investigated in detail. The optimum process parameters obtained include that the applied voltage was 15kv, the spinneret-plate distance was 7cm and the angle between the two spinnerets was 130o. The mechanical properties of these yarns have been evaluated, including twist and tensile strength. This work can provide a novel and general approach to design and produce nanofiber yarns for textiles, biomedical and industrial applications.

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4

Widjojo, Natalia, Tai-Shung Chung, Davis Yohanes Arifin, Martin Weber, and Volker Warzelhan. "Elimination of die swell and instability in hollow fiber spinning process of hyperbranched polyethersulfone (HPES) via novel spinneret designs and precise spinning conditions." Chemical Engineering Journal 163, no. 1-2 (September 2010): 143–53. http://dx.doi.org/10.1016/j.cej.2010.07.048.

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5

Potter, Gregory, Raul Barbosa, Alexa Villarreal, Alexandra Salinas, Hector Guzman, Heriberto De Leon, Javier A. Ortega, and Karen Lozano. "Design and Validation of a Portable Handheld Device to Produce Fine Fibers Using Centrifugal Forces." Instruments 4, no. 3 (September 14, 2020): 27. http://dx.doi.org/10.3390/instruments4030027.

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In the present research project, a novel portable battery-powered handheld device able to produce micron and submicron fibers using centrifugal forces is proposed. The design includes spinnerets with a clamshell configuration with multiple chambers or reservoirs (2, 4, and 8) and different exit orifice diameters (400, 500, 600, and 800 µm). The rotational speed is controlled via an Arduino microcontroller. To validate the design, a series of experiments were conducted and the effect of the orifice diameter, number of chambers, and velocity on the resulting fibers’ diameter and yield was studied. For the experiments, a polymeric solution of Polyvinyl Alcohol (PVA) was prepared. The fiber yield was gravimetrically quantified, and the fiber morphology and diameter were analyzed by means of scanning electron microscopy (SEM). The experimental results showed that spinnerets with an orifice diameter of 500 microns yielded the greatest amount of fibers (0.0777 g). In addition, the number of chambers also affected the amount of fibers produced, and it was determined that the fiber diameter size is dependent on the spinneret speed. Fibers 80 nm in diameter were observed at 6500 rpm.

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6

Han, Koohee, Gašper Kokot, Shibananda Das, Roland G. Winkler, Gerhard Gompper, and Alexey Snezhko. "Reconfigurable structure and tunable transport in synchronized active spinner materials." Science Advances 6, no. 12 (March 2020): eaaz8535. http://dx.doi.org/10.1126/sciadv.aaz8535.

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Ensembles of actuated colloids are excellent model systems to explore emergent out-of-equilibrium structures, complex collective dynamics, and design rules for the next generation materials. Here, we demonstrate that ferromagnetic microparticles suspended at an air-water interface and energized by an external rotating magnetic field spontaneously form dynamic ensembles of synchronized spinners in a certain range of the excitation field parameters. Each spinner generates strong hydrodynamic flows, and collective interactions of the multiple spinners promote a formation of dynamic lattices. On the basis of experiments and simulations, we reveal structural transitions from liquid to nearly crystalline states in this novel active spinner material and demonstrate that dynamic spinner lattices are reconfigurable, capable of self-healing behavior and that the transport of embedded inert cargo particles can be remotely tuned by the parameters of the external excitation field. Our findings provide insights into the behavior of active spinner materials with reconfigurable structural order and tunable functionalities.

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7

Taylor, R. A., and R. S. Brown. "A Design for Spinning Tension Control." Journal of Engineering for Industry 107, no. 2 (May 1, 1985): 220–27. http://dx.doi.org/10.1115/1.3185987.

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A new cap-spinning design is described. A unique feature enables the cap to be operated at different speeds from the bobbin to increase or decrease yarn tension as needed. The new spinner will operate as a modification on a conventional ring spinning frame. However, it eliminates the need for rings and travelers. Due to the spinners independent tension control, it can be operated at extremely high speeds without increasing the ends down rate. Yarn grade and tension comparisons with a ring spinning are reported.

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8

II, Terry F. Pettijohn, and Victoria Riley-Lomedico. "Using Fidget Spinners and Stress Balls Do Not Impact College Introductory Psychology Test Scores." Advances in Research 24, no. 6 (August 29, 2023): 9–13. http://dx.doi.org/10.9734/air/2023/v24i6978.

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Aim: To determine if the use of fidget spinners and stress balls impact college test scores in Introductory Psychology courses. Study Design: A between-participants experimental design was used. Students were randomly assigned into conditions. Place and Duration of Study: The study was conducted at Coastal Carolina University, Conway, South Carolina, USA. Fall semester. Methodology: 170 college students enrolled in Introductory Psychology courses participated in the study. Participants were randomly assigned to use a fidget spinner, a stress ball, or sit quietly for 3 minutes before a unit test in their Introductory Psychology course. Results: Quantitative data was analyzed using SPSS. There were no statistically significant differences in test scores between the three groups (P=.28). The fidget spinner group (M=75.82, SD=13.12), the stress ball group (M=76.41, SD=13.89), and the control group (M=79.33, SD=11.17) scored similarly to each other on the unit test. Conclusion: Using fidget spinners or stress balls do not impact Introductory Psychology test scores.

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9

Wang, Dong, Yang Zhou, and Chong Chang Yang. "Study and Design on the Automatic Drying Machine of Spinneret." Advanced Materials Research 945-949 (June 2014): 1318–21. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.1318.

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This paper introduced spinneret cleaning technology. Aiming at the probles of noisy, low-efficiency, high-intensity, artificial drying in actual spinneret drying process of the factory, the process of spinneret automatic drying is studied and an automatic spinneret drying machine is designed. An experiment is conducted on the prototype of the machine, which shows that the work efficiency has increased dramatically and the noise has decreased obviously.

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10

Afzal, Ali, Jean-Yves Drean, Omar Harzallah, Nabyl Khenoussi, Sheraz Ahmad, and Niaz-Ahmad Akhtar. "Development of multifunctional different cross-sectional shaped coaxial composite filaments for SMART textile applications." Textile Research Journal 87, no. 16 (September 2, 2016): 1991–2004. http://dx.doi.org/10.1177/0040517516663144.

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The aim of this study is to design a spinneret that can be used efficiently for the manufacturing of coaxial composite filaments. Poly(ethylene terephthalate) was used as resin matrix with 99.9% pure copper filament as the core. The characterization of the polymer was done to determine polymer thermal and rheological properties. Multi-shaped coaxial composite filaments were obtained after successful laboratory-scale melt extrusion machine modification and spinneret development. The cross-sectional surface and shape were analyzed with a scanning electron microscope. Coaxial filaments having the cross-section including elliptical, triangular, rectangular and circular shapes were developed. The characterization of spinneret design and coaxial composite filaments were also reported. The effect of spinneret design parameters on the cross-sectional shape of the filament were analyzed.

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11

Matveev, Dmitry N., and Vladimir P. Vasilevsky. "Influence of Spinneret Dimensional Parameters on Gas Separation Properties of Polysulfone Hollow Fiber Membranes." Key Engineering Materials 899 (September 8, 2021): 451–55. http://dx.doi.org/10.4028/www.scientific.net/kem.899.451.

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The design and dimensional characteristics of the spinneret affect not only the geometry of the hollow fiber, but also the transport properties of the hollow fiber membranes. In the literature available today, there is a limited number of works in which the influence of the design and dimensional characteristics of the spinneret is studied. In this work, using the example of polysulfone hollow fiber membranes, it was shown that the use of a spinneret with smaller annular diameters leads to an increase in the gas permeability of the hollow fiber membrane with a decrease in the value of the ideal selectivity for the He/CO2 gas pair. It was found that using the spinneret with large annular diameters, the hollow fiber membrane is obtained with a smaller value of the average pore size of the flow, which is in agreement with the obtained data on gas permeability.

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12

Jiang, Guo Jun, and Sai Zhang. "Design of Terraced Spinneret Based on Simulation of Electric Field Distribution in Electrospinning." Advanced Materials Research 690-693 (May 2013): 3132–35. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.3132.

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The low productivity of conventional single-needle electrospinning inhibits the application of nanofibers to a commercial level. In order to improve the productivity of the electrospinning technique, a terraced spinneret has been designed based on the finite element analysis in this paper. The electric field distribution was modeled with the use of Ansoft Maxwell software. The experiment results demonstrated this special design spinneret has the potential to produce smooth nanofibers on a large scale.

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13

Jiang, Jiaxin, Xiang Wang, Wenwang Li, Juan Liu, Yifang Liu, and Gaofeng Zheng. "Electrohydrodynamic Direct-Writing Micropatterns with Assisted Airflow." Micromachines 9, no. 9 (September 11, 2018): 456. http://dx.doi.org/10.3390/mi9090456.

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Electrohydrodynamic direct-writing (EDW) is a developing technology for high-resolution printing. How to decrease the line width and improve the deposition accuracy of direct-written patterns has been the key to the promotion for the further application of EDW. In this paper, an airflow-assisted spinneret for electrohydrodynamic direct-writing was designed. An assisted laminar airflow was introduced to the EDW process, which provided an additional stretching and constraining force on the jet to reduce the surrounding interferences and enhance jet stability. The flow field and the electric field around the spinneret were simulated to direct the structure design of the airflow-assisted spinneret. Then, a series of experiments were conducted, and the results verified the spinneret design and demonstrated a stable ejection of jet in the EDW process. With assisted airflow, the uniformity of printed patterns and the deposition position accuracy of a charged jet can be improved. Complex patterns with positioning errors of less than 5% have been printed and characterized, which provide an effective way to promote the integration of micro/nanosystems.

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14

Wu, Hui Hui, Xiao Hua Meng, and Yong Chun Zeng. "A Method for Scale-Up of Grooved Nanofibers via Flat Off-Centered Core-Shell Structure Spinneret." Advanced Materials Research 989-994 (July 2014): 556–59. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.556.

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An approach to the scale-up of grooved nanofibers via a flat off-centered core-shell structure spinneret has been developed in this study. The spinneret with a flat surface involves shell-holes and off-centered core-needles. The position of the core-needle in the hole and the electrospinning process do influence the formation and structure of the grooved nanofibers. The production rate of the core-shell nanofibers can be enhanced by increasing the hole and needle number of the spinneret. This novel design is expected to provide a promising method towards the massive production of grooved nanofibers.

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15

Chu, Wei Cheng, Chin Pan Huang, Tien Wei Shyr, Li Chou Chen, and Shu Ping Chiu. "Design and Evaluation of Spinneret Module with Line-Type and Multi-Holes of Electro-Spun." Applied Mechanics and Materials 311 (February 2013): 243–48. http://dx.doi.org/10.4028/www.scientific.net/amm.311.243.

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For the wide application in the field of filtration and bio-medicine, the purpose of this study is to design a spinneret module of electro-spun which can produce composite nonwoven with sub-micrometer fiber continually. Applying the principle of melt-blown, a spinneret module with line-type and multi-holes which was assembled with small beads and filtering net, was designed. In order to construct a continual electro-spun production line, a traversal device was designed to control the traverse-motion of spinneret module for the even lapping and a stainless plate was adopted as collecting plate. In condition of 41KV working voltage, 0.3573 mL/min throughput and 42cm CSD (Capillary-Screen-Distance), a continual PEO nonwoven can be produced with average fiber diameter of 576nm and of CV% 13.4%. To a sampling area of 10cm×10cm and basis weight of 7.257 g/m2 electro-spun nonwoven, the CV% of gray level of its image is 2% and its filtration efficiency is up to 91.2% with pressure drop 13.8mm-H20 by TSI 8130 (32LPM, 5% NaCl).

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16

Liu, Hong-Yan, Zhi-Min Li, Yan-Ju Yao, and Frank Ko. "Analytical modelling of dry-jet wet spinning." Thermal Science 21, no. 4 (2017): 1807–12. http://dx.doi.org/10.2298/tsci160110072l.

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This paper introduces an analytical method for the analysis and design of a dry-jet wet spinning system. The 1-D mass conservation equation is used, and velocity distribution is assumed to derive a simple relationship among various spinning parameters. The effect of spinneret mass flow rate, solution density, spinneret structure including velocity and air-gap length, and drawing velocity on the dry-jet wet spinning was simulated using the proposed analytical model. Theoretical prediction of fiber diameter is obtained, which depends upon spinning conditions, solution properties, and spinneret structure. The theoretical results were verified by comparing experimental data with the numerical solution. It was found obviously that the theoretical prediction has comparable accuracy as that by numerical computation. The analytical model can be useful for preliminary design of a spinning process for fabrication of fibers with controllable diameter by adjusting parameters in spinning conditions.

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17

Latiffah, Efa, Bertolomeus Haryanto Agung, Dian Ahmad Hapidin, and Khairurrijal Khairurrijal. "Fabrication of Polyvinylpyrrolidone (PVP) Nanofibrous Membranes using Mushroom-Spinneret Needleless Electrospinning." Journal of Physics: Conference Series 2243, no. 1 (June 1, 2022): 012101. http://dx.doi.org/10.1088/1742-6596/2243/1/012101.

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Abstract Mushroom-spinneret is an improved spinneret design for needleless electrospinning apparatus, which has a bowl-shaped base with a mushroom-shaped cover. The mushroom spinneret can overcome some limitations that is often associated with the needleless electrospinning technique, i.e., high excitation voltages, poor stability of free liquid, and difficulty of controlling the spatial motion of multiple jets. In this study, we fabricate polyvinylpyrrolidone (PVP) nanofibrous membranes using mushroom-spinneret needleless electrospinning and determine the effect of solution concentration and applied voltage on the fiber morphology and diameter. The solution concentration had significant effect on the fibers diameter. When the solution concentration was increased from 8 wt% to 12 wt%, the average fibers diameter increased from 0.99 μm to 1.31 μm and the fibers diameter distribution became wider. Moreover, the average fiber diameter decreased from 1.31 μm to 1.16 μm when the applied voltage was increased from 30 kV to 45 kV. The coefficient of variations (CV) for all membrane samples ranged from 0.12 - 0.26, indicated uniform fibers.

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18

Afzal, Ali, Omar Harzallah, Jean-Yves Drean, Niaz-Ahmad Akhtar, and Sheraz Ahmad. "Performance characterization of multifunctional different cross-sectional-shaped coaxial composite filaments for SMART textile applications." Journal of Industrial Textiles 48, no. 6 (February 6, 2018): 1059–80. http://dx.doi.org/10.1177/1528083718757522.

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The aim of this study is to investigate the effect of spinneret design parameters on cross-sectional shape and mechanical performance characteristics of coaxial composite filaments. A number of different cross-sectional-shaped metal/polymer core/sheath coaxial composite filaments were developed by changing spinneret design parameters. The cross-sectional shapes obtained were circular, rectangular, triangular and elliptical shapes. The mechanical performance of filaments was evaluated for application in sensors and actuators. The change of cross-sectional shape significantly influences mechanical properties of developed filaments which express their vulnerability during applied stresses in their life cycle.

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19

Yang, Zhanping, Li Zhang, Rouxi Chen, Ji-Huan He, Jian-Hua Cao, and Minfeng Song. "Nozzle design in a fiber spinning process for a maximal pressure gradient." Thermal Science 17, no. 5 (2013): 1529–32. http://dx.doi.org/10.2298/tsci1305529y.

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The thickness of a spinneret is always a geometrical constraint in nozzle design. The geometrical form of a nozzle has a significant effect on the subsequent spinning characteristics. This paper gives an optimal condition for maximal pressure gradient through the nozzle.

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20

Khamforoush, M., and T. Asgari. "A Modified Electro-Centrifugal Spinning Method to Enhance the Production Rate of Highly Aligned Nanofiber." Nano 10, no. 02 (February 2015): 1550016. http://dx.doi.org/10.1142/s1793292015500162.

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In this paper, for the aim of increasing the production rate of highly aligned nanofibers, electrocentrifuge spinning (ECS) technique was modified by equipping it with two nozzles as the spinneret. This new setup obviously doubles the production rate of nanofibers relative to the conventional ECS. To investigate the effect of this modification on the degree of nanofibers alignment (DeNA), the values of DeNA were measured for 30 distinctive experiments and the results were compared with that of ECS setup with a single nozzle. The originality of this work has lain in the fact that for these 30 experiments, which were designed by Design Expert Software (DES), the DeNA of the new ECS was the same as the conventional setup. Additionally, a spinneret with four nozzles was employed to evaluate the influence of number of nozzles on the DeNA. Lastly, the optimum values of voltage, polymer concentration, spinneret rotational speed and collector diameter were determined in order to maximize the DeNA of the modified ECS setup.

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21

Raheja, Anant, T. S. Chandra, and T. S. Natarajan. "Design of a low cost spinneret assembly for coaxial electrospinning." Applied Physics Letters 106, no. 25 (June 22, 2015): 254101. http://dx.doi.org/10.1063/1.4922948.

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22

Zheng, Yuansheng, and Yongchun Zeng. "Electric field analysis of spinneret design for multihole electrospinning system." Journal of Materials Science 49, no. 5 (December 3, 2013): 1964–72. http://dx.doi.org/10.1007/s10853-013-7882-8.

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23

Wang, Xin, Xungai Wang, and Tong Lin. "Electric field analysis of spinneret design for needleless electrospinning of nanofibers." Journal of Materials Research 27, no. 23 (October 30, 2012): 3013–19. http://dx.doi.org/10.1557/jmr.2012.346.

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Fábián, Hunor, and Attila Gergely. "Design of a High Performance Fiber-producing Machine." Acta Materialia Transylvanica 5, no. 2 (October 1, 2022): 62–65. http://dx.doi.org/10.33924/amt-2022-02-03.

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Анотація:

Abstract The aim of this work is to design a high-productivity, continuously operating fiber producing device utilizing the centrifugal force to yield polymeric nanofibers. The requirements for the design were 1) to provide a capillary-to-collector distance of 50–200 mm that could be adjusted automatically, 2) allow the rotational speed of the spinneret to be changed in the range of 0–25000 1/min and have continuous feeding. The equipment will form the basis of several research topics, such as the creation and study of solid dispersions of drugs, the development of pressure sensors, and the creation of porous filter membranes.

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Li, Yi, and Masaya Kotaki. "Influence of additive on structure of PVDF nanofibers electrospun via new spinneret design." Journal of Applied Polymer Science 130, no. 3 (May 6, 2013): 1752–58. http://dx.doi.org/10.1002/app.39336.

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Clarizia, Gabriele, Franco Tasselli, and Paola Bernardo. "Effect of Physical Aging on Gas Transport in Asymmetric Polyimide Hollow Fibers Prepared by Triple-Orifice Spinneret." Polymers 12, no. 2 (February 13, 2020): 441. http://dx.doi.org/10.3390/polym12020441.

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Анотація:

The systematic evaluation of the gas transport properties related to differences in the history of the samples is a useful tool to appropriately design a membrane-based gas separation system. The permeation rate of six pure gases was measured over time in asymmetric hollow-fiber (HF) samples, that were prepared according to the non-solvent-induced phase separation in different operation conditions, in order to identify their response to physical aging. Four types of HFs having a different structure were analyzed, comparing samples spun in a triple-orifice spinneret to HFs prepared using a conventional spinneret. A generalized gas permeance decline, coupled to a maintained permselectivity for the different gas pairs, was observed for all HFs. Instead, H2/N2 permselectivity values were enhanced upon aging. Cross-linked hollow-fiber samples showed a marked size-sieving behavior that favored the separation of small species, e.g., hydrogen, from other larger species and a good stability over time. Some HFs, post-treated using different alcohols, presented a permeance decay independently on the alcohol type and a greater selectivity over time.

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Wang, Shu Wen, and Te Li Su. "Design Optimization of Processing Parameters for Polypropylene Fiber Based on the Taguchi Method." Applied Mechanics and Materials 239-240 (December 2012): 1600–1603. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.1600.

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Анотація:

Melt spinning is the method that is most frequently used for manufacturing man-made fibers, while as-spun-fiber is the most important physical nature mainly of breaking strength for processing parameter will base on spinneret temperature, cooling temperature, cooling wind speed, and winding speed and so on to affect its physicality. First of all, suitable orthogonal arrays will be chosen to be applied on experiment plan to conduct experiment, and then it will work with SN (signal-to-noise) ratio and main effect analysis to appreciate the extent of impact of processing parameter on the quality, and confirm its reproducibility. As such, the optimized combination of processing parameters can be obtained.

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Graziano, Paulo A., Alexis M. Garcia, and Taylor D. Landis. "To Fidget or Not to Fidget, That Is the Question: A Systematic Classroom Evaluation of Fidget Spinners Among Young Children With ADHD." Journal of Attention Disorders 24, no. 1 (April 20, 2018): 163–71. http://dx.doi.org/10.1177/1087054718770009.

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Objective: To examine how fidget spinners affect children with ADHD’s gross motor activity and attentional functioning in class, both during the initial and final phase of an intensive evidence-based behavioral treatment. Method: Using an A-B-A-B design, 60 children ( Mage= 4.86 years, 83% Hispanic) diagnosed with ADHD participated in the study. Following a baseline period, four random children from each classroom were given fidget spinners across three separate days ( n = 48). Children wore accelerometers and were videotaped for 5-min during class in which attentional data were coded. Results: During the initial phase of treatment (but not during the final phase), the use of fidget spinners was associated with a decrease in activity levels. Children’s use of fidget spinners was associated with poorer attention across both phases of treatment. Conclusion: Fidget spinners negatively influence young children with ADHD’s attentional functioning, even in the context of an evidence-based classroom intervention.

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29

Zhao, Tienan, Yuansheng Zheng, and Yongchun Zeng. "Design of a novel co‐electrospinning system with flat spinneret for producing helical nanofibers." Journal of Polymer Science Part B: Polymer Physics 57, no. 22 (October 26, 2019): 1496–505. http://dx.doi.org/10.1002/polb.24894.

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30

Zhao, Xiao Ying. "Simulation Analyzing for Spinner Institutions of Iron Roughneck Based on ADAMS." Applied Mechanics and Materials 488-489 (January 2014): 1264–67. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.1264.

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Анотація:

The structure and working principle on Spinner institutions of iron roughneck are introduced. The stress analysis on Spinner institutions is done according to the theory of mechanics and the load formula of the hydraulic cylinder is obtained. Spinner model is set up using professional three-dimensional design software: Inventor, and imported into the ADAMS for simulation analysis, the clamping force curve of spinner institutions and stress value of the key components are obtained. The article verified the correctness of the system and provided theoretical basis for the parameter setting of the system practical action and control.

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31

Annathur, Gopinath V., Jennifer L. Pierce, Rodney G. Combs, Anurag S. Rathore, Amit Banerjee, and David E. Steinmeyer. "Improvements in spinner-flask designs for insect-cell suspension culture." Biotechnology and Applied Biochemistry 38, no. 1 (August 1, 2003): 15. http://dx.doi.org/10.1042/ba20030001.

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32

Guo, Bing Hua, Yu Dong Ren, Lei Chen, Jun Rong Yu, Jing Zhu, and Zu Ming Hu. "Application of Orthogonal Design on Optimization of Spinning Conditions for BTDA-TDI/MDI Ternary Copolyimide Fiber." Materials Science Forum 789 (April 2014): 209–14. http://dx.doi.org/10.4028/www.scientific.net/msf.789.209.

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A polyimide fiber derived from benzophenone-3,3’,4,4’-tetracarboxylic acid dianhydride (BTDA), toluene diisocyanate (TDI) and 4,4’-methylenebis (phenyl isocyanate) (MDI) has been prepared by wet spinning. The chemical structure of the synthetic polyimide was characterized by Fourier transform infrared (FTIR) spectrometry. Also, field emission scanning electron microscope (FESEM) was used to observe the surface and cross-section morphologies of the resulting fibers. In addition, the obtained fibers possessed good thermal and thermo-oxidative stabilities with the initial degradation temperatures in air and nitrogen 499°C and 527°C, respectively. In order to obtain the optimized processing conditions, orthogonal design was applied. An optimal parameter combination was determined which leaded to maximum of tensile strength . As evidenced by variance analysis, the tensile strength of resultant fibers was influenced by negative draw ratio of spinneret remarkably making it the significant factor.

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33

Liu, Zongwei, Wensong Wu, Jing Du, and Shuang Wang. "Lightweight Design Of Composite Spinner For Large Wind Turbine." Journal of Physics: Conference Series 1820, no. 1 (March 1, 2021): 012042. http://dx.doi.org/10.1088/1742-6596/1820/1/012042.

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34

Praneeth, K., S. Kalyani, Y. V. L. Ravikumar, J. Tardio, and S. Sridhar. "Development of polyethersulfone and polyacrylonitrile hollow fiber membranes for clarification of surface water and fungal enzyme broth." Water Supply 13, no. 1 (February 1, 2013): 44–55. http://dx.doi.org/10.2166/ws.2012.074.

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Hollow fiber membranes are of great commercial interest with several applications at the forefront of research to carryout bioseparations, drinking water purification, wastewater treatment besides liquid phase separations and gaseous separations. An experimental study was carried out to synthesize hollow fiber membranes from polyethersulfone (PES) and polyacrylonitrile (PAN) polymers to fabricate modules for surface water treatment and clarification of fungal enzyme broth. Design drawings of a manual hollow fiber spinning machine and spinneret were prepared to fabricate the necessary equipment for extrusion of hollow fibers. Effect of various spinning conditions on specific macroscopic fiber properties, such as outer diameter and wall thickness and membrane pore structure was studied. Concentrations of 15–20 wt% PES in n-methylpyrrolidone (NMP) and PAN in dimethyl formamide (DMF) solvents with important additives and pore formers were prepared. These polymer solutions were extruded through the spinneret and subjected to phase inversion in a water bath. The membranes were characterized by scanning electron microscopy (SEM) and pure water flux studies. PAN and PES exhibited 99.8 and 95.4% turbidity rejection. PAN exhibited a 5 log reduction of Escherichia coli bacteria for surface water treatment at a low hydraulic pressure of 1 bar with a flux of 54.2 L/m2 h at a water recovery of 80% whereas PES gave a flux of 36.6 L/m2 h with 4 log reduction of E. coli. PAN and PES membranes exhibited 54.9 and 69.3% xylanase enzyme recoveries from fungal broth at reasonable flux with turbidity rejection of 94.8 and 95.7% respectively.

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35

Fulton, John P., Ravinder K. Thaper, Simerjeet S. Virk, Timothy McDonald, and Oladiran Fasina. "Effect of Vane Shape on Fertilizer Distribution for a Dual-Disc Spinner Spreader." Applied Engineering in Agriculture 36, no. 5 (2020): 743–51. http://dx.doi.org/10.13031/aea.13634.

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Abstract.Spinner-disc spreaders are commonly used for application of granular fertilizers with components (divider, spinner-discs, and vanes) influencing material flow behavior and distribution. Fertilizer ricocheting off these components is an uncontrolled aspect of material flow that negatively impacts spread uniformity. Therefore, an investigation using potash (KCl) was conducted to understand the impact of vane shape on fertilizer flow, ricocheting and distribution for a dual-disc spinner spreader. Four different vane shapes were used in this study. The first two vanes (Vanes 1 and 2) were common to this type of spinner spreader with a tapered and open-faced design. However, Vane 1 had a forward tapered top edge at an angle of 32° while Vane 2 had a top edge that was tapered backwards at 15°. Vanes 3 and 4 both had C-channel cross sections with Vane 3 tapered from inside out but Vane 4 had a constant height. Treatments included application rates of 220 and 440 kg/ha using three spinner disc speeds (600, 700, and 800 rpm). Stationary tests were conducted using a collection device that mounted around the spinner discs and vanes in order to estimate fertilizer particle exit points off the vanes. Standard pan tests were conducted to characterize resulting spread patterns, effective spread width, and spread uniformity. Results indicated that the level of ricocheting was significantly impacted by top edge design of a vane and increased with disc speed. The forward, upward facing top edge of Vane 1 caused on average, 26% of the material flow to be ricocheted by the vanes thereby inducing an uncontrolled nature of spread. However, the rearward facing top edge of Vane 2 reduced ricocheting by 13% plus generated a backward particle rotation for those contacting it. The majority of ricocheting occurred when particles contacted the vanes compared to the spinner discs. Ricocheting generated an uncontrollable aspect of the spread pattern with these particles applied along the centerline of the spreader. The effective spread width increased with disc speed. All four vane shapes generated equal effective spread widths of 18.3 and 21.3 m at 600 and 700 rpm, respectively. However, at 800 rpm, Vane 4 generated the greatest effective spread width of 24.4 m compared to 22.9 m for the other three vanes. The wider spread width for Vane 4 was contributed to the rectangular U cross-section maximizing the horizontal velocity of potash particles when exiting the vanes compared to the other three, more open faced vanes. Finally, the spread uniformity varied by vane shape with Vane 2 consistently generating the lowest CVs. Keywords: Distribution, Ricocheting, Vane Design, Spread uniformity, pattern.

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Syafiq Sadun, Amirul, Jamaludin Jalani, Suziana Ahmad, Amiera Saryati Sadun, and Sumaiya Mashori. "Development of wireless vertical bar spinner combat robot." Indonesian Journal of Electrical Engineering and Computer Science 18, no. 2 (May 1, 2020): 759. http://dx.doi.org/10.11591/ijeecs.v18.i2.pp759-765.

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Recently, combat robot competition has become one of the most famous engineering competitions among schools and universities. The robots are usually built with a destructive weapon, which can immobilize or disable opponent’s robot and win the match. Despite the variety of robot design and concept, the trend has shown that most of the local contestant tend to design a horizontal axis weapon type. In this project, a wireless vertical axis bar spinner combat robot is designed and developed for the 3rd Malaysia Combat Robot Competition which was held at National Science Centre (PSN) in 2017. The robot is controlled using radio control (RC) and powered by a highly discharge 22.2V Lithium Polymer (LiPo) chemical battery. Furthermore, related analysis has been conducted to meet the design and performance requirement of the competition. With the DC brush motor and thick metal bar rotating in vertical axis, the robot has proven to produce high power, torque and speed during the competition.

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Sulharman, Sulharman. "Rekayasa Alat Peniris Amplang Sistem Sentrifugal dengan Penggerak Manual untuk Industri Kecil Krupuk Amplang." Jurnal Riset Teknologi Industri 8, no. 16 (August 25, 2016): 104–11. http://dx.doi.org/10.26578/jrti.v8i16.1558.

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Engineering research has been done spinner manual tool of amplang and the goal is to accelerate spinner tool of amplang that accelerate the draining oil time and larger production quantities of amplang also saving electricity. This reseach method are (1) design tools, (2) making tools and (3) test tools. Testing the tool by; enter amplang that had been fried in container of spinner machine and then turning it by the handle, and then calculate the length of draining time. Based on the results obtained by means of engineering; frame spinner machine of iron: height 14.5 cm, length 100 cm, width 60 cm, thick 5 cm. Frame player mechanism of iron: height 70 cm, length 23 cm, width 40 cm, thick 5 cm. Frame buffer spinner of iron: top diameter 48 cm, bottom diameter 42 cm, height 50 cm, diameter 1 cm of iron axle. Containers spinner of plastic: top diameter 45.5 cm, bottom diameter of 37.5 cm, height 56 cm.Mechanism player spinner container: top diameter of dish 18 cm and number of teeth 44 pieces, down diameter of dish 6.5 cm and a number of teeth 16 pieces, distance above and below the disc is 53 cm. Results spinner manual tool performance can accommodate 7 kg manual and spinner without rotation only 5 kg.ABSTRAKRekayasa alat peniris amplang manual untuk industri kecil amplang dilakukan dengan tujuannya meningkatkan produktivitas alat peniris amplang sehingga mempercepat waktu penirisan dan jumlah produksi yang lebih besar serta hemat listrik. Metode pembuatan alat peniris, meliputi: (1) desain alat, (2) pembuatan alat, (3) menguji alat. Pengujian alat dilakukan dengan cara; memasukkan amplang yang telah digoreng ke dalam wadah peniris kemudian memutarnya menggunakan handel pemutar, lalu menghitung lama waktu penirisan. Berdasarkan hasil rekayasa alat diperoleh; rangka peniris dari besi: tinggi 14,5 cm, panjang 100 cm, lebar 60 cm, tebal 5 cm Rangka mekanisme pemutar wadah peniris dari besi: tinggi 70 cm, panjang 23 cm, lebar 40 cm, tebal 5 cm. Rangka penyangga peniris dari besi: diameter atas 48 cm, diameter bawah 42 cm, tinggi 50 cm, diameter besi 1 cm. Wadah peniris dari plastik: diameter atas 45,5 cm, diameter bawah 37,5 cm, tinggi 56 cm. Mekanisme pemutar wadah peniris: diameter piringan atas 18 cm dengan jumlah gigi 44 buah, diameter piringan bawah 6,5 cm dengan jumlah gigi 16 buah, jarak piringan atas dan piringan bawah 53 cm. Hasil unjuk kerja alat peniris rekayasa manual dapat menampung 7 kg sebelumnya peniris tanpa putaran hanya 5 kg.Katakunci : alat peniris manual, sentrifugal, kerupuk amplang

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38

Rysiński, Jacek, Robert Drobina, and Marek Praszkiewicz. "Influence of Teeth Manufacturing Tolerances of Cylindrical Geared Wheels on GearOperating Characteristics Based on Spinner Stretching Apparatus." Fibres and Textiles in Eastern Europe 25 (June 30, 2017): 0. http://dx.doi.org/10.5604/01.3001.0010.1702.

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In the paper, issues related to the errors and inaccuracies resulting from improper operation of the drive system of the stretching apparatus of a ring spinner are discussed. The aim of the paper was an analysis of a design solution for the driving system of a ring spinner and its operating behaviour influencing the quality parameters of the fiber jet. In the paper, modelling of the involute teeth shape by means of a BEASY package was done. Based on the model prepared, an assessment of the sensivity of geometrical teeth outline on particular dynamical quantities for the gear of the stretching apparatus was performed. An improvement in the parameters of operating of the spinner can be achieved via changing of the design characteristics of elements of the driving system; in particular, modification of the teeth shape was considered. Within the scope of the work, numerical analyses of the meshing geared wheels were conducted taking into consideration the unevenness of operating of the drive system as well as load distribution acting along the line of action. In the paper, the boundary element method was utilised for evaluation of the load distribution in relation to spectral analysis connected with the unevenness of the fibers’ jet mass.

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39

Tsukanov, Ruslan. "Design of circular air intakes for subsonic turbofans." Aerospace technic and technology, no. 4 (August 11, 2022): 4–13. http://dx.doi.org/10.32620/aktt.2022.4.01.

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The subject matter of this article is the process of subsonic air intake shaping for high-bypass ratio turbofan at the airplane preliminarily designing stage. The goal was to improve a mathematical model of V. I. Polikovskii method of subsonic air intake shaping for high-bypass ratio turbofan. The tasks are to consider the presence of cant of inlet cross-section, required to perform effective operation at airplane cruising angle-of-attacks; to increase the radius of curvature of the air intake lip to provide air flow near it without flow separation, which was definitely determined and could not be increased in the existing method; to improve constant length velocity gradient law (used in this method) so that too large duct expansion angles near the air intake outlet cross-section can be avoided; to consider the engine inlet spinner presence. The methods used are analytical and digital mathematical methods, implemented in MathCAD and Microsoft Visual Studio systems. The following results were obtained: based on the proposed method, new calculation module for the Power Unit software version 11.8 has been developed (С-language Win32 UNICODE application) with a friendly user interface. Conclusions. The scientific novelty of the results obtained is as follows: 1) mathematical model (algorithm and its program implementation) for circular turbofan air intake shaping has been improved considering cant of the inlet cross-section, air intake lip rounding with two radiuses, presence of engine inlet spinner, and zero expansion angles in the diffuser outlet cross-section; 2) adequacy of calculation results using the improved mathematical model is shown using comparison with shapes of circular turbofan air intakes, developed by the leading aviation companies.

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40

Kalluri, Lohitha, and Yuanyuan Duan. "Parameter Screening and Optimization for a Polycaprolactone-Based GTR/GBR Membrane Using Taguchi Design." International Journal of Molecular Sciences 23, no. 15 (July 24, 2022): 8149. http://dx.doi.org/10.3390/ijms23158149.

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Our objective was to determine and optimize the significant parameters affecting mechanical properties and mean fiber diameter (MFD) of a novel GTR/GBR membrane composed of polycaprolactone (PCL) and chicken eggshell membrane (ESM). For this, we prepared electrospun membrane specimens (n = 16) with varying concentrations of PCL, ESM, nano-hydroxyapatite (HAp), and altered electrospinning parameters as generated by DOE++ software. After the determination of MFD and mechanical properties for all specimens, Taguchi orthogonal array L8 design was used to screen significant factors affecting the MFD and mechanical properties. PCL wt%, ESM wt%, HAp wt%, applied voltage (AV), flow rate (FR), and spinneret-collector distance (SCD) were the independent variables investigated. The response variables analyzed were MFD, tensile strength (TS), and elastic modulus. ANOVA outlined ESM wt%, HAp wt%, AV, FR, SCD, and an interactive effect between PCL wt% and AV to be the significant factors affecting modulus values of an electrospun PCL/ESM membrane (p < 0.05). Furthermore, concentrations of PCL and ESM were the significant factors affecting MFD (p < 0.05) and there were no significant factors affecting the TS values. Optimization using DOE++ software predicted that the maximal TS of 3.125 MPa, modulus of 278.168 MPa, and MFD of 882.75 nm could be achieved.

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41

Sonnenschein, Mark F. "Improved spinnerette design for extrusion of polymeric large internal diameter hollow fiber membranes." Journal of Applied Polymer Science 83, no. 10 (January 3, 2002): 2157–63. http://dx.doi.org/10.1002/app.10170.

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42

Garau, M., G. Carta, M. J. Nieves, I. S. Jones, N. V. Movchan, and A. B. Movchan. "Interfacial waveforms in chiral lattices with gyroscopic spinners." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 474, no. 2215 (July 2018): 20180132. http://dx.doi.org/10.1098/rspa.2018.0132.

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We demonstrate a new method of achieving topologically protected states in an elastic hexagonal system of trusses by attaching gyroscopic spinners, which bring chirality to the system. Dispersive features of this medium are investigated in detail, and it is shown that one can manipulate the locations of stop-bands and Dirac points by tuning the parameters of the spinners. We show that, in the proximity of such points, uni-directional interfacial waveforms can be created in an inhomogeneous lattice and the direction of such waveforms can be controlled. The effect of inserting additional soft internal links into the system, which is thus transformed into a heterogeneous triangular lattice, is also investigated, as the hexagonal lattice represents the limit case of the heterogeneous triangular lattice with soft links. This work introduces a new perspective in the design of periodic media possessing non-trivial topological features.

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43

Ouyang, Yu, and Yu Yi. "Retrofitting and Strengthening Design for the Former Yihe Spinner Factory in Shanghai." Advanced Materials Research 133-134 (October 2010): 935–39. http://dx.doi.org/10.4028/www.scientific.net/amr.133-134.935.

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The building of the formerly Yihe Spinner Factory in Shanghai is a protected. To ensure its serviceability, appropriate retrofitting is necessary. Structural analysis based on the inspection result was performed. It is shown that the bearing capacity or the ductility of some members in the original structure as well as the retrofit proposal are inadequate. Strengthening design was then performed. The effect of the subsequent retrofitting process on the strengthened structure was analyzed. The historical building is then properly protected and the new manufacturing requirements are meet through the retrofitting and strengthening design. The proposed methods can serve as references for relative research or engineering practices.

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Nurwaha, Deogratias, Wanli Han, and Xinhou Wang. "Investigation of a New Needleless Electrospinning Method for the Production of Nanofibers." Journal of Engineered Fibers and Fabrics 8, no. 4 (December 2013): 155892501300800. http://dx.doi.org/10.1177/155892501300800413.

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This paper presents the possibility of nanofiber formation by a new multiple jet method. A novel needleless electrospinning apparatus was used to produce nanofibers. This employs a new design for supplying solution to a metal roller spinneret. The advantage of this setup is its ease of scaling-up for increased output. Using this new method it was possible to increase the nanofiber production rate because of the multiple jets. The productivity rate has been significantly enhanced and was 24–30 times higher than single needle electrospinning. It was also possible to produce thinner fibers than the single needle method. It was found that fibers produced by this novel needleless electrospinning had fewer beadings than fibers produced by the conventional electrospinning method. The effects of processing parameters including applied voltage and spinning electrospinning distance on eletrospun fiber diameter were also investigated. The study showed that the electrospun fiber diameter was strongly governed by the processing parameters. It was observed that there was a strong interaction between these parameters.

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Ramdani, Rifki, and Kadarismansyah. "PERANCANGAN MESIN PEMERAS SANTAN DENGAN SISTEM SPINNER." Jurnal Permadi: Perancangan, Manufaktur, Material dan Energi 3, no. 2 (May 31, 2021): 101–13. http://dx.doi.org/10.52005/permadi.v3i2.52.

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Coconut plants are very abundant natural resources and useful for humans. One of the benefits of coconut plants is: coconut flesh which is the raw material for coconut milk which is generally used as food preparations. In general, the process of squeezing coconut milk is still using a manual extortion process, so it requires energy and time which is quite long. To overcome this, it is necessary to design a machine efficient coconut milk squeezer, this machine is designed using materials that economical so that it can be reached by all people, especially those who have a culinary business. This coconut milk squeezer works on the principle of the system rotate, the grated coconut meat is placed in a tube in the machine, at that time the coconut meat will be rotated at high speed so that The liquid coconut milk contained in the coconut meat is separated from the coconut meat. Motorcycle the driving force used is an electric motor, the power on the electric motor will transmitted from the rotation of the pully motor through the v-belt to the pully and the shaft which moved. The extortion process is carried out by pressing the on button so that the tube will rotate automatically. Coconut meat in the tube will not be damaged because there is no pressing process when the engine is rotating.

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Thoriq, Ahmad, Totok Herwanto, and Drupadi Ciptaningtyas. "MODIFIKASI MESIN PENIRIS MINYAK DAN KELAYAKAN FINANSIAL PRODUKSI KERIPIK BAYAM." Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) 7, no. 2 (August 13, 2018): 63. http://dx.doi.org/10.23960/jtep-l.v7i2.63-71.

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Spinach chips is one of the snack products with the main ingredients of fried spinach using flour. The quality of spinach chips is influenced by the amount of oil contained in spinach chips. The use of spinner machine is proven to reduce or eliminate the oil content quickly and improve the quality of the product but the spinner machine available on the market can not be used to drain the oil contained in spinach chips because the rotational speed in the setting of more than 400 rpm can cause damage to spinach chips . This study aims to modify the spinner by lowering the speed of rotation and do the financial feasibility analysis of spinach chips production. The method used in this research is through the approach of engineering design and financial feasibility. The design approach consists of problems identification, formulation of modification concept, functional and performance test while some parameters calculated in financial feasibility analysis are: cost of production (HPP), net present value (NPV), benefit cost ratio (BCR), internal rate of return (IRR), and payback period (PBP). The results showed a decrease in rotational speed from 532.50 rpm to 258.18 rpm was proven to be able to remove the oil content on spinach chips and avoid the damage of spinach chips from 50% to no broken spinach chips. At production capacity of spinach chips 150 kg / month obtained cost of production amounted to Rp. 43,087 / kg. When spinach chips sold at market price Rp.50,000 / kg obtained NPV of Rp. 15,088,782/ month, BCR of 1.10, IRR of 12% and capital will return in the eigth month.

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47

Ndaro, Mbwana Suleiman, Xiang-yu Jin, Ting Chen, and Chong-wen Yu. "Splitting of Islands-in-the-Sea Fibers (PA6/COPET) during Hydroentangling of Nonwovens." Journal of Engineered Fibers and Fabrics 2, no. 4 (December 2007): 155892500700200. http://dx.doi.org/10.1177/155892500700200402.

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This paper summarizes the investigations of hydroentangled islands-in-the-sea (PA6/COPET) fiber webs. An increase in water jet pressure improved the tensile strength and fiber splitting while elongation at break decreased. Scanning Electron Microscope (SEM) micrographs and ANOVA (MS Excel ™) were used for characterizing fiber splitting and data analyses respectively. It can be concluded that with a new innovation in spinnerette design and modification of co-polyester structure, PA6/COPET, fibers can be split in the hydroentanglement process without dissolution of the sea component.

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48

Siswanto, Heru, Slamet Riyadi, Siswadi Siswadi, Gatot Setyono, Dwi Khusna, and Wahyu Nugroho. "Design And Build The Appropriate Technology Machinery For Shredded Fish Processing." Journal of System Engineering and Technological Innovation (JISTI) 2, no. 01 (April 14, 2023): 106–10. http://dx.doi.org/10.38156/jisti.v2i01.38.

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Анотація:

The Shredded fish is produced by machines automatically, which can facilitate the production process. Previously the process was done conventionally in one production run. This problem prompted researchers to create a machine by combining three tool systems to become a shredded fish processing machine, including a system for separating meat and fish bones, a cooking furnace system, and a shredded dryer/spinner system that can be controlled electrically in the production process, in addition to the shredded produced more cleanly and efficiently in one production process. This machine utilizes the power of an electric motor of ¾ Hp, which is the driving force for the meat separator machine with a rotation speed of 2840 rpm and a production capacity of 30 Kg/hour.

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Sugandi, Wahyu K., Ade Moetangad Kramadibrata, Fetriyuna Fetriyuna, and Yoga Prabowo. "Analisis Teknik dan Uji Kinerja Mesin Peniris Minyak (Spinner) (Technical Analysis and Test Performance of Oil Spinner Machine)." Jurnal Ilmiah Rekayasa Pertanian dan Biosistem 6, no. 1 (March 22, 2018): 17–26. http://dx.doi.org/10.29303/jrpb.v6i1.65.

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Technical specification of the spinner at the Pilot Plant of FTIP Unpad was needed to be reviewed through technical analysis and performance test. Experimental Design method of the research was carried out by on the spot observations, measurements, and recalculating machine main components. Results obtained from technical analysis showed that the machine required a driven power of 216 W, one single belt, a minimum shaft diameter of 16 mm, as well as a pin diameter at the main roller and at the pulley of 5,46 mm and 6 mm, respectively. It had a deflection torsion of 0,0460 a critical shaft speed of 1338 RPM, a bearing life of 3.227.817,96 hours, a frame deflection of 0,24 mm, and a frame welding load of 503,74 N. Sofar, the machine has fulfilled its technical feasibility. While the results of performance tests showed that the best taste sensation of the crackers was termed at an engine speed of 650 rpm at an actual capacity of 3.6 kg/h and at a power of 120 W, a specific spin energy of 120 kJ/kg, a spin yield of 97.38 %, an engine efficiency of 65.60 %, an engine performance index of 0.95 at a level of noissiness of 86.86 dBA. The data has fulfilled the performance requirement, but due to its vibration frequency of 21.44 mm/s – which was dangerous, improvements related to it had to be done. Keywords: technical analysis, oil spinner, performance test ABSTRAK Spesifikasi teknis mesin peniris minyak (spinner) di laboratorium Pilot Plant FTIP UNPAD perlu dikaji-ulang melalui analisis teknik dan uji kinerja. Metode analisis deskriptif dalam penelitian ini dilakukan melalui pengukuran, pengamatan dan perhitungan terhadap komponen-komponen utama mesin. Hasil analisis teknik menunjukkan bahwa untuk mengoperasikan mesin ini dibutuhkan daya penggerak 216 Watt, satu sabuk, diameter poros minimum 16 mm, defleksi puntiran 0,0460, putaran kritis poros 1338 RPM, diameter pin pada motor penggerak 5,46 mm, diameter pin pada roll utama dan diameter puli 6 mm. Sementara umur bantalan 3.227 jam, lendutan rangka 0,24 mm, dan beban las rangka 503,74 N. Secara teknis mesin ini telah memenuhi kelayakan teknis. Hasil uji kinerja mesin menunjukkan bahwa sensasi rasa kerupuk terbaik diperoleh pada kecepatan putaran motor 650 RPM dengan kapasitas aktual 3,6 kg/jam pada daya 120 Watt, energi spesifik penirisan 120 kJ/kg, rendemen penirisan 97,376 %, efisiensi mesin 65,60 %, indeks performansi mesin 0,95, dan tingkat kebisingan 86,86 dBA. Data ini telah memenuhi spesifikasi kinerjanya. Namun dengan frekuensi getaran 21,44 mm/s (berbahaya). Perbaikan teknis terkait masalah ini masih perlu dilakukan. Kata kunci: analisis teknik, mesin peniris minyak, uji kinerja

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50

Liu, Jia-Jia, Li-Li Wu, and Ting Chen. "Investigation on the Polymer Drawing Model of the Centrifugal Spinning." Recent Patents on Nanotechnology 14, no. 1 (April 24, 2020): 21–26. http://dx.doi.org/10.2174/1872210513666190801110145.

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Background and Objective: Some patents have reported the centrifugal spinning method which utilizes the centrifugal force produced by a high speed rotating device to fabricate fibers from polymer melts or solutions. Recently, with the development of technologies, centrifugal spinning was employed to produce ultrafine fibers and nanofibers. In order to improve the equipment and technology of centrifugal spinning and obtain finer fibers, it is important to model the polymer drawing of the centrifugal spinning. Methods: The polymer drawing in the centrifugal spinning is modeled and simulated. The force balance equation and heat transfer balance equation are established after analyzing the motion and heat transfer of the polymer melts. These nonlinear equations are solved based on the least square method to obtain the radius of excircle and the shape of streamline. A fourth order Runge-Kutta method is utilized to obtain the diameter and temperature of the threadline because there are initial value problems of first order ordinary differential equations. Streamlines and diameter of polymer melts at different viscoelasticities and different spinning temperatures are obtained. The simulation results are compared with the measured results to verify the polymer drawing model. Results: The viscoelastic force in the centrifugal spinning changes constantly at a fixed rotation speed of the rotating spinneret. As the spinneret is rotating, the radius of excircle R1 increases slowly when the time passes, which means the viscoelastic force decreases slowly. The change of the viscoelastic force accelerates the increase of the radius vector. The simulation results show that the threadline diameter under the condition of changing viscoelastic forces is smaller than that under the condition of fixed visoelastic forces. The temperature of the polymer melts decreases faster under the condition of changing viscoelastic forces than that under the condition of fixed visoelastic forces. The threadline diameter decreases with the increase of the rotation speed. Higher initial polymer temperatures yield smaller fiber diameters. Conclusion: The polymer drawing in the centrifugal spinning is modeled and simulated. The simulation results tally with the measured results confirming the effectiveness of the polymer drawing model. The simulation results show that the change of the viscoelastic force is favorable to the polymer drawing and both larger rotation speeds and higher initial polymer temperatures can produce finer fibers, which lays a good foundation for the computer-assisted design of the centrifugal spinning.

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