Academic literature on the topic 'LCD vat 3D printing'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'LCD vat 3D printing.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "LCD vat 3D printing"
1
Xenikakis, Iakovos, Konstantinos Tsongas, Emmanouil K. Tzimtzimis, Dimitrios Tzetzis, and Dimitrios Fatouros. "ADDITIVE MANUFACTURING OF HOLLOW MICRONEEDLES FOR INSULIN DELIVERY." International Journal of Modern Manufacturing Technologies 13, no. 3 (December 25, 2021): 185–90. http://dx.doi.org/10.54684/ijmmt.2021.13.3.185.
Full textAbstract:
Microneedles (MN) are miniature devices capable of perforating painlessly stratum corneum and delivering active ingredients in the inner epidermal layers. Hollow microneedles (HMNs) are highly detailed objects due to their internal microchannels and thus, their fabrication with Additive Manufacturing (AM) is a challenging task. Vat polymerization techniques provide a sufficient accuracy for such microstructures. Differentiated from other approaches where stereolithography and 2-photon polymerization were adopted, this paper presents the 3D-printing of HMNs purposed for insulin delivery, using the more economic Liquid Crystal Display (LCD) method. First, different geometries (hexagon, square pyramid, beveled) were 3D printed with constant height and varying curing time, printing angle and layer resolution. Quality features in each case were captured with optical and scanning electron microscopy (SEM). The most promising geometry was found to be the beveled one due to the more refined tip area and the feasibility of non-clogged microchannel formation. Among printing parameters, printing angle proved to be the most influential, as it affects resin flow phenomenon during printing process. Lastly, optimized HMN geometry was the beveled configuration, where the average height was measured 900μm, 3D printing angle was set at -45°, the curing time was 10s per layer and the optimal layer height was 30μm.
2
Xenikakis, Iakovos, Konstantinos Tsongas, Emmanouil K. Tzimtzimis, Constantinos K. Zacharis, Nikoleta Theodoroula, Eleni P. Kalogianni, Euterpi Demiri, Ioannis S. Vizirianakis, Dimitrios Tzetzis, and Dimitrios G. Fatouros. "Fabrication of hollow microneedles using liquid crystal display (LCD) vat polymerization 3D printing technology for transdermal macromolecular delivery." International Journal of Pharmaceutics 597 (March 2021): 120303. http://dx.doi.org/10.1016/j.ijpharm.2021.120303.
Full text
3
Tsolakis, Ioannis A., William Papaioannou, Erofili Papadopoulou, Maria Dalampira, and Apostolos I. Tsolakis. "Comparison in Terms of Accuracy between DLP and LCD Printing Technology for Dental Model Printing." Dentistry Journal 10, no. 10 (September 28, 2022): 181. http://dx.doi.org/10.3390/dj10100181.
Full textAbstract:
Background: The aim of this study is to evaluate the accuracy of a Liquid Crystal Display (LCD) 3D printer compared to a Direct Light Processing (DLP) 3D printer for dental model printing. Methods: Two different printers in terms of 3D printing technology were used in this study. One was a DLP 3D printer and one an LCD 3D printer. The accuracy of the printers was evaluated in terms of trueness and precision. Ten STL reference files were used for this study. For trueness, each STL file was printed once with each 3D printer. For precision, one randomly chosen STL file was printed 10 times with each 3D printer. Afterward, the models were scanned with a model scanner, and reverse engineering software was used for the STL comparisons. Results: In terms of trueness, the comparison between the LCD 3D printer and DLP 3D printer was statistically significant, with a p-value = 0.004. For precision, the comparison between the LCD 3D printer and the DLP 3D printer was statistically significant, with a p-value = 0.011. Conclusions: The DLP 3D printer is more accurate in terms of dental model printing than the LCD 3D printer. However, both DLP and LCD printers can accurately be used to print dental models for the fabrication of orthodontic appliances.
4
Sameni, Farzaneh, Basar Ozkan, Hanifeh Zarezadeh, Sarah Karmel, Daniel S. Engstrøm, and Ehsan Sabet. "Hot Lithography Vat Photopolymerisation 3D Printing: Vat Temperature vs. Mixture Design." Polymers 14, no. 15 (July 23, 2022): 2988. http://dx.doi.org/10.3390/polym14152988.
Full textAbstract:
In the vat photopolymerisation 3D printing technique, the properties of the printed parts are highly dependent on the degree of conversion of the monomers. The mechanisms and advantages of vat photopolymerisation at elevated temperatures, or so called “hot lithography”, were investigated in this paper. Two types of photoresins, commercially used as highly accurate castable resins, with different structural and diluent monomers, were employed in this study. Samples were printed at 25 °C, 40 °C, and 55 °C. The results show that hot lithography can significantly enhance the mechanical and dimensional properties of the printed parts and is more effective when there is a diluent with a network Tg close to the print temperature. When processed at 55 °C, Mixture A, which contains a diluent with a network Tg = 53 °C, was more readily impacted by heat compared to Mixture B, whose diluent had a network Tg = 105. As a result, a higher degree of conversion, followed by an increased Tg of the diluents, and improvements in the tensile strength and dimensional stability of the printed parts were observed, which enhanced the outcomes of the prints for the intended application in investment casting of complex components used in the aero and energy sectors. In conclusion, the effectiveness of the hot lithography process is contained by a correlation between the process temperature and the characteristics of the monomers in the mixture.
5
Sirrine, Justin M., Alisa Zlatanic, Viswanath Meenakshisundaram, Jamie M. Messman, Christopher B. Williams, Petar R. Dvornic, and Timothy E. Long. "3D Printing Amorphous Polysiloxane Terpolymers via Vat Photopolymerization." Macromolecular Chemistry and Physics 220, no. 4 (January 7, 2019): 1800425. http://dx.doi.org/10.1002/macp.201800425.
Full text
6
Sotov, Anton, Artem Kantyukov, Anatoly Popovich, and Vadim Sufiiarov. "LCD-SLA 3D printing of BaTiO3 piezoelectric ceramics." Ceramics International 47, no. 21 (November 2021): 30358–66. http://dx.doi.org/10.1016/j.ceramint.2021.07.216.
Full text
7
Saptono, Marcell Petrus, and Romdani Paris Fuad. "PROTOTYPE RANCANGAN PRINTER 3D DENGAN SMART LCD BERBASIS ARDUINO MEGA 2560 MENGGUNAKAN TEKNOLOGI FUSED FILAMENT FABRICATION." Electro Luceat 6, no. 1 (July 1, 2020): 20–27. http://dx.doi.org/10.32531/jelekn.v6i1.191.
Full textAbstract:
Dalam Pembangunan system industry 4.0 salah satu yang menopang pembangunan adalah teknologi 3D Printing. Tujuan dari Penelitian ini adalah merancang mesin Printer 3D dengan Microkontroller Arduino MEGA 2560, RAMPS 1.4 Shield, Motor stepper NEMA 17, DVR8825 motor driver, Filament PLA, E3D v6 HotEnd, Memory Card, Smart LCD. Konstruksi rangka rancang bangun alat Printing 3D dengan melakukan perakitan rangka mesin printing 3D, Motor Stepper Mesin 3D, Limit Endstop XYZ, dudukan exstruder, dudukan bed, perakitan HotEnd untuk heater pemanas. Proses pencetakan dapat terhubung dengan PC atau menggunakan dukungan memory card, dan instruksi pengoperasian ditampilkan dalam monitor LCD. Penelitian ini menghasilkan printer 3D berbasis Arduino dengan teknologi FFF (Fused Filament Fabrication) yang akan memudahkan pengguna dalam mengoperasikan printer 3D dengan layar LCD dan Pencetakan tidak harus selalu terbuhung dengan PC karena menggunakan memory card yang dapat menyimpan file dan menghasilkan pencetakan yang lebih baik. Penelitian ini menggunakan metode penelitian model Linier Sequential Model (LSM). Model ini sering disebut dengan “Classic Life Cycle” atau model waterfall. Metode ini terdiri 5 tahapan yang berulang yaitu tahap analisis studi literatur, tahap desain/perancangan sistem, tahap perakitan hardware, tahap pengkodean, dan tahap pengujian (Pressman, R.S, 2012).
8
Wilts, Emily M., Allison M. Pekkanen, B. Tyler White, Viswanath Meenakshisundaram, Donald C. Aduba, Christopher B. Williams, and Timothy E. Long. "Vat photopolymerization of charged monomers: 3D printing with supramolecular interactions." Polymer Chemistry 10, no. 12 (2019): 1442–51. http://dx.doi.org/10.1039/c8py01792a.
Full text
9
Weems, Andrew C., Kayla R. Delle Chiaie, Joshua C. Worch, Connor J. Stubbs, and Andrew P. Dove. "Terpene- and terpenoid-based polymeric resins for stereolithography 3D printing." Polymer Chemistry 10, no. 44 (2019): 5959–66. http://dx.doi.org/10.1039/c9py00950g.
Full text
10
Mohamed, Mohamed, Hitendra Kumar, Zongjie Wang, Nicholas Martin, Barry Mills, and Keekyoung Kim. "Rapid and Inexpensive Fabrication of Multi-Depth Microfluidic Device using High-Resolution LCD Stereolithographic 3D Printing." Journal of Manufacturing and Materials Processing 3, no. 1 (March 20, 2019): 26. http://dx.doi.org/10.3390/jmmp3010026.
Full textAbstract:
With the dramatic increment of complexity, more microfluidic devices require 3D structures, such as multi-depth and -layer channels. The traditional multi-step photolithography is time-consuming and labor-intensive and also requires precise alignment during the fabrication of microfluidic devices. Here, we present an inexpensive, single-step, and rapid fabrication method for multi-depth microfluidic devices using a high-resolution liquid crystal display (LCD) stereolithographic (SLA) three-dimensional (3D) printing system. With the pixel size down to 47.25 μm, the feature resolutions in the horizontal and vertical directions are 150 μm and 50 μm, respectively. The multi-depth molds were successfully printed at the same time and the multi-depth features were transferred properly to the polydimethylsiloxane (PDMS) having multi-depth channels via soft lithography. A flow-focusing droplet generator with a multi-depth channel was fabricated using the presented 3D printing method. Experimental results show that the multi-depth channel could manipulate the morphology and size of droplets, which is desired for many engineering applications. Taken together, LCD SLA 3D printing is an excellent alternative method to the multi-step photolithography for the fabrication of multi-depth microfluidic devices. Taking the advantages of its controllability, cost-effectiveness, and acceptable resolution, LCD SLA 3D printing can have a great potential to fabricate 3D microfluidic devices.
Dissertations / Theses on the topic "LCD vat 3D printing"
1
Sirrine, Justin Michael. "Tailoring Siloxane Functionality for Lithography-based 3D Printing." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/97196.
Full textAbstract:
Polymer synthesis and functionalization enabled the tailoring of polymer functionality for additive manufacturing (AM), elastomer, and biological applications. Inspiration from academic and patent literature prompted an emphasis on polymer functionality and its implications on diverse applications. Critical analysis of existing elastomers for AM aided the synthesis and characterization of novel photopolymer systems for lithography-based 3D printing. Emphasis on structure-processing-property relationships facilitated the attainment of success in proposed applications and prompted further fundamental understanding for systems that leveraged poly(dimethyl siloxane)s (PDMS), aliphatic polyesters, polyamides, and polyethers for emerging applications.
The thiol-ene reaction possesses many desirable traits for vat photopolymerization (VP) AM, namely that it proceeds rapidly to high yield, does not undergo significant side reactions, remains tolerant of the presence of water or oxygen, and remains regiospecific. Leveraging these traits, a novel PDMS-based photopolymer system was synthesized and designed that underwent simultaneous chain extension and crosslinking, affording relatively low viscosity prior to photocuring but the modulus and tensile strain at break properties of higher molecular weight precursors upon photocuring. A monomeric competition study confirmed chemical preference for the chain-extension reaction in the absence of diffusion. Photocalorimetry, photorheology, and soxhlet extraction measured photocuring kinetics and demonstrated high gel fractions upon photocuring. A further improvement on the low-temperature elastomeric behavior occurred via introduction of a small amount of diphenylsiloxane or diethylsiloxane repeating units, which successfully suppressed crystallization and extended the rubbery plateau close to the glass transition temperature (Tg) for these elastomers. Finally, a melt polymerization of PDMS diamines in the presence of a disiloxane diamine chain extender and urea afforded isocyanate-free polyureas in the absence of solvent and catalyst. Dynamic mechanical analysis (DMA) measured multiple, distinct α-relaxations that suggested microphase separation. This work leverages the unique properties of PDMS and provides multiple chemistries that achieve elastomeric properties for a variety of applications.
Similar work of new polymers for VP AM was performed that leveraged the low Tg poly(propylene glycol) (PPG) and poly(tri(ethylene glycol) adipate) (PTEGA) for use in tissue scaffolding, footwear, and improved glove grip performance applications. The double endcapping of a PPG diamine with a diisocyanate and then hydroxyethyl acrylate provided a urethane/urea-containing, photocurable oligomer. Supercritical fluid chromatography with evaporative light scattering detection elucidated oligomer molecular weight distributions with repeat unit resolution, while the combination of these PPG-containing oligomers with various reactive diluents prior to photocuring yielded highly tunable and efficiently crosslinked networks with wide-ranging thermomechanical properties. Functionalization of the PTEGA diol with isocyanatoethyl methacrylate yielded a photocurable polyester for tissue scaffolding applications without the production of acidic byproducts that might induce polymer backbone scission. Initial VP AM, cell viability experiments, and modulus measurements indicate promise for use of these PTEGA oligomers for the 3D production of vascularized tissue scaffolds.
Similar review of powder bed fusion (PBF) patent literature revealed a polyamide 12 (PA12) composition that remained melt stable during PBF processing, unlike alternative commercial products. Further investigation revealed a fundamental difference in polymer backbone and endgroup chemical structure between these products, yielding profound differences for powder recyclability after printing. An anionic dispersion polymerization of laurolactam in the presence of a steric stabilizer and initiator yielded PA12 microparticles with high sphericity directly from the polymerization without significant post-processing requirements. Steric stabilizer concentration and stirring rate remained the most important variables for the control of PA12 powder particle size and melt viscosity. Finally, preliminary fusion of single-layered PA12 structures demonstrated promise and provided insight into powder particle size and melt viscosity requirements.PHD
2
Nath, Shukantu Dev. "FABRICATION AND PERFORMANCE EVALUATION OF SANDWICH PANELS PRINTED BY VAT PHOTOPOLYMERIZATION." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/theses/2883.
Full textAbstract:
Sandwich panels serve many purposes in engineering applications. Additive manufacturing opened the door for easy fabrication of the sandwich panels with different core structures. In this study, additive manufacturing technique, experiments, and numerical analysis are combined to evaluate the mechanical properties of sandwich panels with different cellular core structures. The sandwich panels having honeycomb, re-entrant honeycomb, diamond, square core topologies are printed with the vat photopolymerization technique. Uniaxial compression testing is performed to determine the compressive modulus, strength, and specific strength of these lightweight panels. Elasto-plastic finite element analysis having good similarities with the experimental results provided a preview of the stress distribution of the sandwich panels under applied loading. The imaging of the tested samples showed the fractured regions of the cellular cores. Dynamic mechanical analysis of the panels provided scope to compare the performance of panels and solid materials with the variation of temperature. Sandwich panels with the diamond structure exhibit better compressive properties and specific strength while the re-entrant structure offers high energy absorption capacity. The sandwich structures provided better thermo-mechanical properties than the solid material. The findings of this study offer insights into the mechanical properties of sandwich panels printed with vat photopolymerization technique which can benefit a wide range of engineering applications.
3
Chartrain, Nicholas. "Designing Scaffolds for Directed Cell Response in Tissue Engineering Scaffolds Fabricated by Vat Photopolymerization." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/95939.
Full textAbstract:
Vat photopolymerization (VP) is an additive manufacturing (AM) technology that permits the fabrication of parts with complex geometries and feature sizes as small as a few microns. These attributes make VP an attractive option for the fabrication of scaffolds for tissue engineering. However, there are few printable materials with low cytotoxicity that encourage cellular adhesion. In addition, these resins are not readily available and must be synthesized. A novel resin based on 2-acrylamido-2-methyl-1-propanesulfonic acid (NaAMPS) and poly(ethylene glycol) diacrylate (PEGDA) was formulated and printed using VP. The mechanical properties, water content, and high fidelity of the scaffold indicated promise for use in tissue engineering applications. Murine fibroblasts were observed to successfully adhere and proliferate on the scaffolds.
The growth, migration, and differentiation of a cell is known to dependent heavily on its microenvironment. In engineered constructs, much of this microenvironment is provided by the tissue scaffold. The physical environment results from the scaffold's geometrical features, including pore shape and size, porosity, and overall dimensions. Each of these parameters are known to affect cell viability and proliferation, but due to the difficulty of isolating each parameter when using scaffold fabrication techniques such as porogen leaching and gas foaming, conflicting results have been reported. Scaffolds with pore sizes ranging from 200 to 600 μm were fabricated and seeded with murine fibroblasts. Other geometric parameters (e.g., pore shape) remained consistent between scaffold designs. Inhomogeneous cell distributions and fewer total cells were observed in scaffolds with smaller pore sizes (200-400 μm). Scaffolds with larger pores had higher cell densities that were homogeneously distributed. These data suggest that tissue scaffolds intended to promote fibroblast proliferation should be designed to have pore at least 500 μm in diameter.
Techniques developed for selective placement of dissimilar materials within a single VP scaffold enabled spatial control over cellular adhesion and proliferation. The multi-material scaffolds were fabricated using an unmodified and commercially available VP system. The material preferences of murine fibroblasts which resulted in their inhomogeneous distribution within multi-material scaffolds were confirmed with multiple resins and geometries. These results suggest that multi-material tissue scaffolds fabricated with VP could enable multiscale organization of cells and material into engineered constructs that would mimic the function of native tissue.Doctor of Philosophy
Vat photopolymerization (VP) is a 3D printing (or additive manufacturing) technology that is capable of fabricating parts with complex geometries with very high resolution. These features make VP an attractive option for the fabrication of scaffolds that have applications in tissue engineering. However, there are few printable materials that are biocompatible and allow cells attachment. In addition, those that have been reported cannot be obtained commercially and their synthesis requires substantial resources and expertise. A novel resin composition formulated from commercially available components was developed, characterized, and printed. Scaffolds were printed with high fidelity. The scaffolds had mechanical properties and water contents that suggested they might be suitable for use in tissue engineering. Fibroblast cells were seeded on the scaffolds and successfully adhered and proliferated on the scaffolds. The growth, migration, and differentiation of cells is influenced by the environmental stimuli they experience. In engineered constructs, the scaffold provides many of stimuli. The geometrical features of scaffolds, including how porous they are, the size and shape of their pores, and their overall size are known to affect cell growth. However, scaffolds that have a variety of pore sizes but identical pore shapes, porosities, and other geometric parameters cannot be fabricated with techniques such as porogen leaching and gas foaming. This has resulted in conflicting reports of optimal pore sizes. In this work, several scaffolds with identical pore shapes and porosities but pore sizes ranging from 200 μm to 600 μm were designed and printed using VP. After seeding with cells, scaffolds with large pores (500-600 μm) had a large number of evenly distributed cells while smaller pores resulted in fewer cells that were unevenly distributed. These results suggest that larger pore sizes are most beneficial for culturing fibroblasts. Multi-material tissue scaffolds were fabricated with VP by selectively photocuring two materials into a single part. The scaffolds, which were printed on an unmodified and commercially available VP system, were seeded with cells. The cells were observed to have attached and grown in much larger numbers in certain regions of the scaffolds which corresponded to regions built from a particular resin. By selectively patterning more than one material in the scaffold, cells could be directed towards certain regions and away from others. The ability to control the location of cells suggests that these printing techniques could be used to organize cells and materials in complex ways reminiscent of native tissue. The organization of these cells might then allow the engineered construct to mimic the function of a native tissue.
4
Cashman, Mark Francis. "Siloxane-Based Reinforcement of Polysiloxanes: from Supramolecular Interactions to Nanoparticles." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/100134.
Full textAbstract:
Polysiloxanes represent a unique class of synthetic polymers, employing a completely inorganic backbone structure comprised of repeating –(Si–O)n– 'siloxane' main chain linkages. This results in an assortment of diverse properties exclusive to the siloxane bond that clearly distinguish them from the –(C–C)n– backbone of purely organic polymers.
Previous work has elucidated a methodology for fabricating flexible and elastic crosslinked poly(dimethyl siloxane) (PDMS) constructs with high Mc through a simultaneous crosslinking and chain-extension methodology. However, these constructs suffer the poor mechanical properties typical of lower molecular weight crosslinked siloxanes (e.g. modulus, tear strength, and strain at break). Filled PDMS networks represent another important class of elastomers in which fillers, namely silica and siloxane-based fillers, impart improved mechanical properties to otherwise weak PDMS networks. This work demonstrates that proper silicon-based reinforcing agent selection (e.g. siloxane-based MQ copolymer nanoparticles) and incorporation provides a synergistic enhancement to mechanical properties, whilst maintaining a low viscosity liquid composition, at high loading content, without the use of co-solvents or heating. Rheological analysis evaluates the viscosity while photorheology and photocalorimetry measurements evaluate rate and extent of curing of the various MQ-loaded formulations, demonstrating theoretical printability up to 40 wt% MQ copolymer nanoparticle incorporation. Dynamic mechanical analysis (DMA) and tensile testing evaluated thermomechanical and mechanical properties of the cured nanocomposites as a function of MQ loading content, demonstrating a 3-fold increase in ultimate stress at 50 wt% MQ copolymer nanoparticle incorporation. VP AM of the 40 wt% MQ-loaded, photo-active PDMS formulation demonstrates facile amenability of photo-active PDMS formulations with high MQ-loading content to 3D printing processes with promising results.
PDMS polyureas represent an important class of elastomers with unique properties derived from the synergy between the nonpolar nature, unusual flexibility, and low glass transition temperature (Tg) afforded by the backbone siloxane linkages (-Si-O)n- of PDMS and the exceptional hydrogen bond ordering and strength evoked by the bidentate hydrogen bonding of urea. The work herein presents an improved melt polycondensation synthetic methodology, which strategically harnesses the spontaneous pyrolytic degradation of urea to afford a series of PDMS polyureas via reactions at high temperatures in the presence of telechelic amine-terminated oligomeric poly(dimethyl siloxane) (PDMS1.6k-NH2) and optional 1,3-bis(3-aminopropyl)tetramethyldisiloxane (BATS) chain extender. This melt polycondensation approach uniquely circumvents the accustomed prerequisite of isocyanate monomer, solvent, and metal catalysts to afford isocyanate-free PDMS polyureas using bio-derived urea with the only reaction byproduct being ammonia, a fundamental raw ingredient for agricultural and industrial products.
As professed above, reinforcement of polysiloxane materials is ascertained via the incorporation of reinforcing fillers or nanoparticles (typically fumed silica) or blocky or segmented development of polymer chains eliciting microphase separation, in order to cajole the elongation potential of polysiloxanes. Herein, a facile approach is detailed towards the synergistic fortification of PDMS-based materials through a collaborative effort between both primary methods of polysiloxane reinforcement. A novel one-pot methodology towards the facile, in situ incorporation of siloxane-based MQ copolymer nanoparticles into segmented PDMS polyureas to afford MQ-loaded thermoplastic and thermoplastic elastomer PDMS polyureas is detailed. The isocyanate-free melt polycondensation achieves visible melt dispersibility of MQ copolymer nanoparticles (good optical clarity) and affords segmented PDMS polyureas while in the presence of MQ nanoparticles, up to 40 wt% MQ, avoiding post-polymerization solvent based mixing, the only other reported alternative. Incorporation of MQ copolymer nanoparticles into segmented PDMS polyureas provides significant enhancements to modulus and ultimate stress properties: results resemble traditional filler effects and are contrary to previous studies and works discussed in Chapter 2 implementing MQ copolymer nanoparticles into chemically-crosslinked PDMS networks. In situ MQ-loaded, isocyanate-free, segmented PDMS polyureas remain compression moldable, affording transparent, free-standing films.Master of Science
Polysiloxanes, also referred to as 'silicones' encompass a unique and important class of polymers harboring an inorganic backbone. Polysiloxanes, especially poly(dimethyl siloxane) (PDMS) the flagship polymer of the family, observe widespread utilization throughout industry and academia thanks to a plethora of desirable properties such as their incredible elongation potential, stability to irradiation, and facile chemical tunability. A major complication with the utilization of polysiloxanes for mechanical purposes is their poor resistance to defect propagation and material failure. As a result polysiloxane materials ubiquitously observe reinforcement in some fashion: reinforcement is achieved either through the physical or chemical incorporation of a reinforcing agent, such as fumed silica, or through the implementation of a chemical functionality that facilitates reinforcement via phase separation and strong associative properties, such as hydrogen bonding. This research tackles polysiloxane reinforcement via both of these strategies. Facile chemical modification permits the construction PDMS polymer chains that incorporate hydrogen bonding motifs, which phase separate to afford hydrogen bond-reinforced phases that instill vast improvements to elastic behavior, mechanical and elongation properties, and upper-use temperature. Novel nanocomposite formulation through the incorporation of MQ nanoparticles (which observe widespread usage in cosmetics) facilitate further routes toward improved mechanical and elongation properties. Furthermore, with growing interest in additive manufacturing strategies, which permit the construction of complex geometries via an additive approach (as opposed to conventional manufacturing processes, which require subtractive approaches and are limited in geometric complexity), great interest lies in the capability to additively manufacture polysiloxane-based materials. This work also illustrates the development of an MQ-reinforced polysiloxane system that is amenable to conventional vat photopolymerization additive manufacturing: chemical modification of PDMS polymer chains permits the installation of UV-activatable crosslinking motifs, allowing solid geometries to be constructed from a liquid precursor formulation.
5
Wu, Kun-Ta, and 巫昆達. "Research on High-speed UV LCD Vat Photopolymerization 3D Printing System Development." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/jjp39t.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
107
Based on the 3D printing system developed by the laboratory, this thesis develops the LCD-type photo-curing system with UV light source for the first time, and analyzes the influence of the light source factor on the printing. Since it is the first time to use this UV LED light source film group, in order to measure the power supply of the film group, the power supply is used to supply the voltage and current required by the light source film group and the POWERMETER instrument is used to measure the supply wattage. The intensity of light energy. In addition, the pattern exposure experiment was used to test the uniformity of light, formability and precision. Design a heat dissipation system to reduce the temperature of the high-energy light source module to increase the service life of the module and prevent excessive heat energy from affecting the speed at which the resin is cured. In the machine control and LCD panel graphic display, the Raspberry Pi with Python program for transmission control, in order to do the overall print test. At the end of the experiment, the 405nm wavelength UV LED light source module was compared with the commercial machines Phrozen and Arkuretta used by most consumers. Although the three are the LCD type machine, they use different light source modules. The difference in exposure light source can affect the results of printing, such as dimensional accuracy, sharpness of the edge of the object, and so on.
6
Liu, De-Feng, and 劉德風. "Research and Development of Mobile Device Vat Photopolymerization 3D Printing System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5g2c5w.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
105
This study is about a mobile device vat photopolymerization 3D printing system. The system uses a mobile device instead of an expensive laser or a UV lamp to be the light source and pattern generator. Using a timing belt and a linear slide instead of a screw and a shaft to drive the Z-axis stage. This system allows larger positioning tolerance and has high z-axis resolution at the same time by virtue of the flexibility of timing belt. Besides, this study established a standard operating procedure for adjusting the important parameter in the 3D printing process, the “exposure time”. This procedure can quantify the curing degree of the resin by using the Fourier Transform Infrared Spectrometer (FTIR). The quantified curing degree can be used to readjust the exposure time of the 3D printing system when the light source is changed (e.g., the light source is changed from a smartphone to a tablet or another smartphone), let the 3D printing system can operate like the light source is never changed. Finally, measuring the dimensional deviation of the mobile device 3D printing system by printing some samples. The result shows that the dimensional deviation of the X-Y axis is under 260μm by using commercial resin “NT-01” and is under 180μm by adding inhibitor into the resin “NT-01”. The Z-axis dimensional deviation is under 60μm no matter adding inhibitor or not.
7
Chen, Yun-Han, and 陳蘊函. "Research and Development of Multi - colour Multi-function Vat Polymerization 3D Printing System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/twt6rc.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
105
The DLP system is still under development, but most of the DLP system of the resin can be printed monochrome, and this study using the smart phone under the 3D printing system with multi-resin disc,To change the resin tank with the material. In the match with the multi-resin disc after the movement of the body can use the rotation characteristics of the phone's multi-functional features camera, Bluetooth, control, to achieve scanning function, and the use of different colors with the resin to print out multi-color 3D objects,but in different The printing between the materials will cause the resin tank in the mutual doping of resin, and different colors of the resin may be in the connection will be a some problem. At present, in the cleaning is the organic solvent with the ultrasonic cleaner is the most clean and clean way to clean up in this experiment is the newly developed machine can be changed for the resin slot to do printing, so to avoid mutual doping must increase the cleaning system,But to increase the ultrasonic shock cleaning system will increase the complexity and weight on the machine too much, so through the machine to print out the multi-color three-dimensional model, analysis of visible light multi-color light curing technology characteristics, and test change cleaning method to find in The most convenient or clean cleaning on the machine is to prevent the cleaning of the resin.
8
Deng, Jin-Yu, and 鄧晉宇. "Research and Improvement of Multi-color Multi-Material Vat Polymerization 3D Printing System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7mqfp4.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
106
The DLP systems is still in development, but most of the systems use DLP or laser as the light source. Most multi-material machines are top-illuminated and there are few down-lit multi-color multi-material 3D printing. This multi-color multi-material 3D printing system used a mobile device, with a rotating disc that can be assembled with several material slots. This study is to improve the multi-color light-curing 3D printing system and is the same as the original system, which uses a portable device and a rotating disk. The improved machine has the function of printing multi-color and printing Multi-materials, and corrects problems that occurred on the original system. The improved positioning accuracy of the rotating disc can be increased by more than 50%. When printing large objects, it will not directly hit the resin tank; and the problem that the Mobile phone is dragged by the turntable will also be sloved, the Mobile phone platform will keep away before the turntable turns away. When the dial is positioned and then returned to the original position, the mobile phone will not be driven by the rotating disc during printing, which improves the success rate of printing.
9
Robles-Martinez, P., X. Xu, S. J. Trenfield, A. Awad, A. Goyanes, Richard Telford, A. W. Basit, and S. Gaisford. "3D Printing of a Multi-Layered Polypill Containing Six Drugs Using a Novel Stereolithographic Method." 2019. http://hdl.handle.net/10454/17370.
Full textAbstract:
YesThree-dimensional printing (3DP) has demonstrated great potential for multi-material fabrication because of its capability for printing bespoke and spatially separated material conformations. Such a concept could revolutionise the pharmaceutical industry, enabling the production of personalised, multi-layered drug products on demand. Here, we developed a novel stereolithographic (SLA) 3D printing method that, for the first time, can be used to fabricate multi-layer constructs (polypills) with variable drug content and/or shape. Using this technique, six drugs, including paracetamol, cffeine, naproxen, chloramphenicol, prednisolone and aspirin, were printed with dfferent geometries and material compositions. Drug distribution was visualised using Raman microscopy, which showed that whilst separate layers were successfully printed, several of the drugs diffused across the layers depending on their amorphous or crystalline phase. The printed constructs demonstrated excellent physical properties and the different material inclusions enabled distinct drug release profiles of the six actives within dissolution tests. For the first time, this paper demonstrates the feasibility of SLA printing as an innovative platform for multi-drug therapy production, facilitating a new era of personalised polypills.
Books on the topic "LCD vat 3D printing"
1
Wang, Xiaolong. Vat Photopolymerization 3D Printing: Processes, Materials, and Applications. Elsevier, 2024.
Find full text
2
Narayan, Roger J., ed. Additive Manufacturing in Biomedical Applications. ASM International, 2022. http://dx.doi.org/10.31399/asm.hb.v23a.9781627083928.
Full textAbstract:
Volume 23A provides a comprehensive review of established and emerging 3D printing and bioprinting approaches for biomedical applications, and expansive coverage of various feedstock materials for 3D printing. The Volume includes articles on 3D printing and bioprinting of surgical models, surgical implants, and other medical devices. The introductory section considers developments and trends in additively manufactured medical devices and material aspects of additively manufactured medical devices. The polymer section considers vat polymerization and powder-bed fusion of polymers. The ceramics section contains articles on binder jet additive manufacturing and selective laser sintering of ceramics for medical applications. The metals section includes articles on additive manufacturing of stainless steel, titanium alloy, and cobalt-chromium alloy biomedical devices. The bioprinting section considers laser-induced forward transfer, piezoelectric jetting, microvalve jetting, plotting, pneumatic extrusion, and electrospinning of biomaterials. Finally, the applications section includes articles on additive manufacturing of personalized surgical instruments, orthotics, dentures, crowns and bridges, implantable energy harvesting devices, and pharmaceuticals. For information on the print version of Volume 23A, ISBN: 978-1-62708-390-4, follow this link.
Book chapters on the topic "LCD vat 3D printing"
1
Bongiovanni, Roberta, and Alessandra Vitale. "Vat Photopolymerization." In High Resolution Manufacturing from 2D to 3D/4D Printing, 17–46. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-13779-2_2.
Full text
2
Vladić, Gojko, Bojan Banjanin, Nemanja Kašiković, and Živko Pavlović. "Vat photopolymerization." In Polymers for 3D Printing, 65–74. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-818311-3.00018-5.
Full text
3
Murphy, Caroline A., Cesar R. Alcala-Orozco, Alessia Longoni, Tim B. F. Woodfield, and Khoon S. Lim. "Vat Polymerization." In Additive Manufacturing in Biomedical Applications, 39–47. ASM International, 2022. http://dx.doi.org/10.31399/asm.hb.v23a.a0006882.
Full textAbstract:
Abstract Vat polymerization is a form of three-dimensional (3D) printing. Historically, it is the oldest additive manufacturing technique, with the development of stereolithography apparatus (SLA) by Charles Hull in 1986. This article outlines the various forms of vat polymerization techniques used for biomedical applications. Due to the complex nature of this printing process, many key print parameters and material properties need to be considered to ensure a successful print. These influential parameters are addressed throughout the article to inform the reader of the considerations that should be taken when using the vat polymerization technique. The article provides information on vat polymerization printer setup, the photo-cross-linking mechanism, and considerations using vat polymerization. In addition, it outlines and discusses the advancements of vat polymerization in the biomedical industry.
4
Khosravi, Rooz. "Additively Manufactured Dental Appliances." In Additive Manufacturing in Biomedical Applications, 466–71. ASM International, 2022. http://dx.doi.org/10.31399/asm.hb.v23a.a0006901.
Full textAbstract:
Abstract This article provides an overview of the adoption of additively manufactured materials in dentistry. It discusses the practical workflows of a three-dimensional printing technology, vat photopolymerization. Three subgroups of the vat photopolymerization process are laser beam or classic stereolithography apparatus (SLA), direct light processing, and liquid-crystal-display-masked SLA. The article covers two subgroups of 3D printing resins-based appliances, namely intraoral and extraoral appliances. Information on various types of dental appliances and the fabrication of in-office appliances is provided. The article also reviews fourth-dimension printing and discusses the applications of the personalized care model in medicine and dentistry.
5
Novak, James I. "Self-Directed Learning in the Age of Open Source, Open Hardware and 3D Printing." In Research Anthology on Makerspaces and 3D Printing in Education, 122–40. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-6295-9.ch007.
Full textAbstract:
This chapter investigates the role of online communities in the future of learning. It considers the paradigm shift from the “push” of more formal educational models, to the notion of “pull” whereby people actively pursue personalized learning experiences. Empowered by the internet and the ability to access information and connect to each other at any time, massive online communities are building vast pools of information around specialized topics such as 3D printing, coding and electronics. This chapter discusses the role of digital technologies in transforming educational models. It provides an argument that practice-led, self-directed research is changing the way people engage with learning. The argument is supported by examples of practice from online communities, university and school education, drawing together key considerations for the future of education that are particularly relevant for technology and educational researchers, teachers across disciplines and those developing higher-level curriculum directives.
6
Novak, James I. "Self-Directed Learning in the Age of Open Source, Open Hardware and 3D Printing." In Ubiquitous Inclusive Learning in a Digital Era, 154–78. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-6292-4.ch007.
Full textAbstract:
This chapter investigates the role of online communities in the future of learning. It considers the paradigm shift from the “push” of more formal educational models, to the notion of “pull” whereby people actively pursue personalized learning experiences. Empowered by the internet and the ability to access information and connect to each other at any time, massive online communities are building vast pools of information around specialized topics such as 3D printing, coding and electronics. This chapter discusses the role of digital technologies in transforming educational models. It provides an argument that practice-led, self-directed research is changing the way people engage with learning. The argument is supported by examples of practice from online communities, university and school education, drawing together key considerations for the future of education that are particularly relevant for technology and educational researchers, teachers across disciplines and those developing higher-level curriculum directives.
7
Whenish, Ruban, Pearlin Hameed, Revathi Alexander, Joseph Nathanael, and Geetha Manivasagam. "Powder-Bed Fusion of Polymers." In Additive Manufacturing in Biomedical Applications, 57–74. ASM International, 2022. http://dx.doi.org/10.31399/asm.hb.v23a.a0006883.
Full textAbstract:
Abstract According to International Organization for Standardization (ISO)/ASTM International 52900, additive manufacturing (AM) can be classified into material extrusion, material jetting, vat photo polymerization, binder jetting, sheet lamination, powder-bed fusion (PBF), and directed-energy deposition. This article discusses the processes involved in polymer powder 3D printing using laser fusion/ sintering and fusing agents and energy, as well as the thermally fused PBF. It provides information on polymer powder parameters and modeling, the powder-handling system, powder characterization, the flowability of powder feedstock, and polymer part characteristics. The article describes the types of polymers in PBF, the processes involved in powder recycling, and the prospects of PBF in AM. In addition, the biomedical application of polyether ether ketone (PEEK) is also covered.
8
Sing, S. L., S. Huang, and W. Y. Yeong. "Additive Manufacturing of Titanium and Titanium Alloy Biomedical Devices." In Additive Manufacturing in Biomedical Applications, 1–9. ASM International, 2022. http://dx.doi.org/10.31399/asm.hb.v23a.a0006857.
Full textAbstract:
Abstract Additive manufacturing (AM), or three-dimensional (3D) printing, has been widely used for biomedical devices due to its higher freedom of design and its capability for mass customization. Additive manufacturing can be broadly classified into seven categories: binder jetting, directed energy deposition (DED), material extrusion, material jetting, powder-bed fusion (PBF), sheet lamination, and vat photopolymerization. Due to their capability for manufacturing high-quality parts that are fully dense, PBF and DED are the most widely used groups of AM techniques in processing metals directly. In this article, the processing of titanium and its alloys by PBF and DED is described, with a specific focus on their use in biomedical devices. The article then covers the density and mechanical properties of both commercially pure titanium and titanium-aluminum-vanadium alloy. Lastly, the challenges and potential of using new titanium-base materials are discussed.
Conference papers on the topic "LCD vat 3D printing"
1
Shan, Yujie, Aravind Krishnakumar, Zehan Qin, and Huachao Mao. "Smart Resin Vat: Real-Time Detecting Failures, Defects, and Curing Area in Vat Photopolymerization 3D Printing." In ASME 2022 17th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/msec2022-85691.
Full textAbstract:
Abstract Real-time and in-situ printing performance diagnostic in vat photopolymerization is critical to control printing quality, improve process reliability, and reduce wasted time and materials. This paper proposed a low-cost smart resin vat to monitor the printing process and detect the printing faults. Built on a conventional vat photopolymerization process, we added equally spaced thermistors along the edges of the resin vat. During printing, polymerization heat transferred to the edges of the resin vat, which increased thermistors’ temperature and enhanced resistances. The heat flux received at each thermistor varied with the distance to the place of photopolymerization. The temperature profiles of all thermistors were determined by the curing image pattern in each layer, and vice versa. Machine learning algorithms were leveraged to infer the printing status from the measured temperatures of these thermistors. Specifically, we proposed a simple and robust Failure Index to detect if the printing was active or terminated. Gaussian process regression was utilized to predict the printing area using the temperature recordings within a layer. The model was trained, validated, and tested using the data set collected by printing six parts. Different printing abnormalities, including printing failures, manual printing pause, and missing features (incorrect printing area), were successfully detected. The proposed approach modified the resin vat only and could be easily applied to all vat photopolymerization processes, including SLA, DLP, and LCD based 3D printing. The limitation and future work are also highlighted.
2
Paquet, Chantal, Bhavana Deore, Hendrick W. de Haan, Antony Orth, Thomas Lacelle, Yujie Zhang, and Katie Sampson. "Diffusion and phase separation in vat polymerization 3D printing." In Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XV, edited by Georg von Freymann, Eva Blasco, and Debashis Chanda. SPIE, 2022. http://dx.doi.org/10.1117/12.2607132.
Full text
3
Meem, Asma Ul Hosna, Kyle Rudolph, Allyson Cox, Austin Andwan, Timothy Osborn, and Robert Lowe. "Impact of Process Parameters on the Tensile Properties of DLP Additively Manufactured ELAST-BLK 10 UV-Curable Elastomer." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-64002.
Full textAbstract:
Abstract Digital light processing (DLP) is an emerging vatphotopolymerization-based 3D-printing technology where full layers of photosensitive resin are irradiated and cured with projected ultraviolet (UV) light to create a three-dimensional part layer-by-layer. Recent breakthroughs in polymer chemistry have led to a growing number of UV-curable elastomeric photoresins developed exclusively for vat photopolymerization additive manufacturing (AM). Coupled with the practical manufacturing advantages of DLP AM (e.g., industry-leading print speeds and sub-micron-level print resolution), these novel elastomeric photoresins are compelling candidates for emerging applications requiring extreme flexibility, stretchability, conformability, and mechanically-tunable stiffness (e.g., soft robotic actuators and stretchable electronics). To advance the role of DLP AM in these novel and promising technological spaces, a fundamental understanding of the impact of DLP manufacturing process parameters on mechanical properties is requisite. This paper highlights our recent efforts to explore the process-property relationship for ELAST-BLK 10, a new commercially-available UV-curable elastomer for DLP AM. A full factorial design of experiments is used to investigate the effect of build orientation and layer thickness on the quasi-static tensile properties (i.e., small-strain elastic modulus, ultimate tensile strength, and elongation at fracture) of ELAST-BLK 10. Statistical results, based on a general linear model via ANOVA methods, indicate that specimens with a flat build orientation exhibit the highest elastic modulus, ultimate tensile strength, and elongation at fracture, likely due to a larger surface area that enhances crosslink density during the curing process. Several popular hyperelastic constitutive models (e.g., Mooney-Rivlin, Yeoh, and Gent) are calibrated to our quasi-static tensile data to facilitate component-level predictive analyses (e.g., finite-element modeling) of soft robotic actuators and other emerging soft-matter applications.
4
Jiang, Yuan, and Yan Zhang. "High performance micromixers by 3D printing based on split-and-recombine modules and twisted-architecture microchannel." In Intelligent Human Systems Integration (IHSI 2022) Integrating People and Intelligent Systems. AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1001085.
Full textAbstract:
Micromixers present essential roles in providing homogeneous mixtures in microfluidic systems. As the typical passive micromixers, the split-and-recombine (SAR) micromixer and twisted-architecture micromixer have the advantages of high mixing efficiency and low mixing consumption.To enhance the mixing performance , the twisted-architecture micromixer was optimized and improved by introducing 1 to 4 split-and-recombine modules. All micromixers in this work could be fabricated by LCD 3D printers, a rapid prototyping technology. Combined with mixing experiments and numerical simulation, it is proved that the mixing speed and mixing efficiency of these new micromixers are enhanced greatly. Among these new provided micromixers with a 10 mm mixing distance, the torsional micromixer with 4 split-and-recombine modules has the best mixing efficiency of more than 60% as well as a low mixing cost in the Reynolds number range of 0.1 to 100, which shows a quite good application prospects in the accurate and rapid microfluidic devices.
5
Baumgarner, Julia, and Davide Piovesan. "Irradiation and Thermal Post-Processing for Vat-Polymerization Additive Manufacturing: Tensile Properties of Four Formlabs Resins." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-73152.
Full textAbstract:
Abstract With the introduction and recent advances of additive manufacturing there are a number of materials available for creating medical prototypes. Of particular interest are materials used for imitating bone properties for the execution of mock preparatory surgeries. However, when designing a print for a model it is important to understand the mechanical properties of each material. One of the most common methods of 3d printing is stereolithography. In this paper, four Formlabs resins were tested in tensile loading. Clear, Durable, Tough, and High Temperature resins were used for testing. Samples were tested with and without post-processing curing. Curing was performed in a customized curing oven that follows the Formlabs requirements. After testing, mechanical properties were calculated for all sample groups.
6
Junk, Stefan, and Felix Bär. "Comparison of Technical and Economic Properties of Additively Manufactured Components Using Masked Stereolithography and Fused Layer Modeling." In 2022 International Additive Manufacturing Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/iam2022-94087.
Full textAbstract:
Abstract Additive manufacturing with plastics enables the production of lightweight and resilient components with a high degree of design freedom. In the low-cost sector, Material Extrusion as Fused Layer Modeling (FLM) has so far been the leading method, as it offers simple 3D printers and a variety of inexpensive 3D materials. However, printing times for 6FLM are very long and dimensional accuracy and surface finish are rather poor. Recently, new processes from the field of Vat Polymerization have appeared on the market, such as masked Stereolithography (mSLA), which offer a significant improvement in component quality and build speed at equally favorable machine costs. This paper therefore analyzes the technical and economic capabilities of the two competing additive processes. For this purpose, the achievable dimensional and surface qualities are determined using a test specimen which represents various important geometry elements. In addition, the machine and material costs are determined and compared with each other. Finally, the resulting environmental impact is determined in the form of the CO2 footprint. In order to optimize the strength of the printed components, material properties of the tensile specimens produced additively with mSLA are determined. The use of ABS-like resins will also be investigated to determine optimal processing settings.
7
Alrashdan, Abdulrahman, William Jordan Wright, and Emrah Celik. "Light Assisted Hybrid Direct Write Additive Manufacturing of Thermosets." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24525.
Full textAbstract:
Abstract In the past recent years, numerous studies have been conducted on additive manufacturing of thermosets and thermoset composites. Thermosets are an important class of polymers used in engineering applications. Monomer units in these material systems irreversibly cross-link when external stimuli or a chemical crosslinking agent is applied in terms of the curing or photopolymerization process. Thermally curing thermosets mark unique mechanical properties including, high temperature resistance, strong chemical bond, and structural integrity and therefore these materials find wide range of applications currently. However, direct write additive manufacturing of these material systems at high resolution and at complex geometries is challenging. This is due to the slow curing rate of thermally curing thermoset polymers which can adversely affect the printing process, and the final shape of the printed object. On the other hand, VAT Polymerization additive manufacturing, which is based on curing the photopolymer resin by Ultraviolet (UV) light, can allow the fabrication of complex geometries and excellent surface finish of the printed parts due to the fast curing rate of photopolymers used in this technique. Mechanical properties of photopolymers, however, are usually weaker and more unstable compared to the thermally curing polymers used in the direct write additive manufacturing method. Therefore, this study focuses on taking the advantages of these two thermoset additive manufacturing methods by utilizing both the thermally cured epoxy and photopolymer resins together. Using the direct writing, the resin mixture is extruded though a nozzle and the final 3D object is created on the print bed. Simultaneously, the deposited ink is exposed to the UV light enhancing the yield strength of the printed material and partially curing it. Therefore, thermally cured epoxy is used to obtain the desirable mechanical properties, while the addition of the photopolymer resin allows the thermoset mixture to partially solidify the printed ink when exposed to the UV light. The results achieved in this study showed that, the hybrid additive manufacturing technology is capable of fabricating complex and tall structure which cannot be printable via additive manufacturing method. In addition, mechanical properties of the hybrid thermoset ink are comparable to the thermally cured thermoset polymer indicating the great potential of the light-assisted, hybrid manufacturing to fabricate mechanically strong parts at high geometrical resolution.
8
Divjak, Alan, Mile Matijević, and Krunoslav Hajdek. "Review of photopolymer materials in masked stereolithographic additive manufacturing." In 11th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design, 2022. http://dx.doi.org/10.24867/grid-2022-p46.
Full textAbstract:
Among the many types of additive manufacturing, stereolithography (SLA) stands out as one of the most versatile technologies, especially in the production of large prototypes of extremely high surface quality. The basic working principle of this technology has not changed for almost thirty years, but the recent rapid development of the mask-based variant of stereolithographic 3D printing technology (MSLA) has significantly increased its popularity and made it available to a wider range of users. This is especially true for MSLA 3D printers that use liquid crystal displays (LCD) for mask forming. These 3D printers are characterized by large build volume, high resolution and speed of model production, and low price. These factors make them extremely attractive for rapid prototyping or small-scale serial production. However, although they are superior to classical laser-based stereolithography in many technical aspects, their current main drawback is the smaller range of available materials. The development of modern stereolithographic technology has clearly shown that the capabilities of 3D printers themselves are just as important as the materials from which the models are made, the diversity of their mechanical characteristics, available colours, and optical properties. The materials used in all variants of SLA technology are liquid thermoset polymers that are sensitive to UV light (photopolymers). A wide range of areas of application requires a wide range of materials that meet the specific needs of each application. MSLA, as a newer technology, still does not have the same range of materials as 3D printers based on the laser variant of stereolithography. The situation is significantly improving with the increase in the number of available MSLA 3D printers, their popularity, and improved technical characteristics, and it can be said that this is the last step in legitimizing MSLA technology as a competitor to laser stereolithography. The aim of this paper is to analyse the material market for MSLA technology, categorize the supply of materials and objectively compare the available materials with those offered by reputable manufacturers of materials for classic SLA 3D laser printers. Special emphasis is placed on the quality and scope of technical specifications of MSLA materials, which is crucial for their professional use. In addition, the impact of thermoset polymers on user health and the environment is an especially important topic, so an overview of plant-based materials was also made.
Reports on the topic "LCD vat 3D printing"
1
Ovalle, Samuel, E. Viamontes, and Tony Thomas. Optimization of DLP 3D Printed Ceramic Parts. Florida International University, October 2021. http://dx.doi.org/10.25148/mmeurs.009776.
Full textAbstract:
Digital Light Processing (DLP) 3D printing allows for the creation of parts with advanced engineering materials and geometries difficult to produce through conventional manufacturing techniques. Photosensitive resin monomers are activated with a UV-producing LCD screen to polymerize, layer by layer, forming the desired part. With the right mixture of photosensitive resin and advanced engineering powder material, useful engineering-grade parts can be produced. The Bison 1000 is a research-grade DLP printer that permits the user to change many parameters, in order to discover an optimal method for producing 3D parts of any material of interest. In this presentation, the process parameter optimization and their influence on the 3D printed parts through DLP technique will be discussed. The presentation is focused on developing 3D printable slurry, printing of complex ceramic lattice structures, as well as post heat treatment of these DLP-produced parts.