Готові списки джерел за темами / Papermaking Quality control

Добірка наукової літератури з теми "Papermaking Quality control"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Papermaking Quality control"

Su, Dong Hai, and Zhi Zhang. "Paper Machine Boots Type Press Control System Analysis." Advanced Materials Research 711 (June 2013): 291–93. http://dx.doi.org/10.4028/www.scientific.net/amr.711.291.

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In the papermaking process, improve the efficiency of dehydration is the most important part of the control system of the paper machine press section, in order to improve the the papermaking efficiency and the quality of paper, the paper analyzed, the shoe working hydraulic oil passage analyzed.

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Kälviäinen, H. "Machine vision based quality control from pulping to papermaking for printing." Pattern Recognition and Image Analysis 21, no. 3 (September 2011): 486–90. http://dx.doi.org/10.1134/s1054661811020441.

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PRUSZYNSKI, PRZEMYSLAW, LEBO XU, and PETER W. HART. "Water chemistry challenges in pulping and papermaking – fundamentals and practical insights: Part 1: Water chemistry fundamentals and pH." June 2022 21, no. 6 (July 1, 2022): 313–24. http://dx.doi.org/10.32964/tj21.6.313.

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Water is an essential component of the papermaking process. Nevertheless, papermakers often overlook its importance compared to fibers and chemical additives. A better understanding of water properties and chemical interactions associated with water at the wet end leads to a sound foundation for high-quality paper production and smooth operation. Not all fresh water and process water is the same. Fresh water varies from mill to mill, primarily due to the location and availability of water sources. Some industrial trends, such as enhancing water conservation and production yield, gradually shift process water quality over time. The current work serves as a primer on water and water chemistry fundamentals to help the papermaker prepare for the future challenges of increased contamination of process water associated with reduced fresh water usage. This paper focuses on basic water chemistry definitions and discusses the impact of pH on wet-end operation. It is clear that pH is a fundamental factor that directly affects the process and impacts other factors relevant to the papermaking process. It is crucial to understand what pH represents, how it is measured, how to select the proper pH and carefully control it, and how to closely maintain the process at target setpoints. Understanding the sensitivity of operation to pH change will lead to an appropriate focus on these issues. In addition to basic theory, we also review onsite experience and practical mill cases. It is imperative to stress that, although critical, pH is not the only chemical parameter impacting papermaking operations. Other factors, such as ionic concentration measured by conductivity, surface, soluble charge, and hardness, are critical and will be discussed in Part II of this series. As pH is a primary and independent factor that impacts various forms of charge and conductivity, the authors decided to start the current series of papers by discussing pH.

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KUMAR, VARUN, PUNEET PATHAK, and NISHI KANT BHARDWAJ. ""PRODUCTION OF ADVANCED FIBRILLATED CELLULOSIC MATERIAL FROM WHEAT STRAW BY REFINING PROCESS TO IMPROVE PAPER QUALITY"." Cellulose Chemistry and Technology 56, no. 5-6 (June 21, 2022): 625–35. http://dx.doi.org/10.35812/cellulosechemtechnol.2022.56.55.

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"In this study, a simple refining approach was tested to prepare an advanced fibrillated cellulosic material from wheat straw to avoid harmful oxidative pretreatment chemicals and to sort out cost and drainage issues. The wheat straw was delignified by pulping (soda-anthraquinone) and bleaching, and converted into advanced fibrillated cellulosic material by pretreatment with mild potassium hydroxide, followed by refining using a Valley beater. Scanning electron microphotographs analyzed by Image J software confirmed the micro-nano scale fibrillation in the prepared advanced fibrillated cellulosic material. After addition of 5% advanced fibrillated cellulosic material as a strength additive, the pulp drainability (36 °SR) was found suitable for papermaking. Paper handsheets containing 5% advanced fibrillated cellulosic material showed 4.7% reduction in bulk and 30%, 17% and 124% increment in breaking length, burst factor and double fold, respectively, when compared with the control set. Comparable tear and optical properties were also observed with better surface properties. The laboratory results confirmed the potential of the prepared advanced fibrillated cellulosic material as an appropriate additive for paper quality improvement."

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Yang, Xiangjun, Lu Li, Wuyun Zhao, Mengyang Wang, Wanxia Yang, Yuhang Tian, Ruizhe Zheng, Shuhang Deng, Yongsong Mu, and Xiaodong Zhu. "Characteristics and Functional Application of Cellulose Fibers Extracted from Cow Dung Wastes." Materials 16, no. 2 (January 9, 2023): 648. http://dx.doi.org/10.3390/ma16020648.

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The widespread use of petroleum-based products has led to increasing environmental and ecological problems, while the extraction and application of various natural cellulose fibers have received increasing attention. This research focuses on the extraction of cellulose fibers from cow dung using different treatments: hot water, hydrogen peroxide (H2O2), sodium hydroxide (NaOH) and potassium hydroxide (KOH) boilings, as well as a selection of the best quality cow dung fibers for papermaking with quality control. The study’s objective is to find a sustainable method to extract as much material as possible from renewable biomass feedstock. The results show that the best extraction rate is obtained by KOH boiling with 42% cellulose fibers extracted. Corresponding handmade paper has a burst index of 2.48 KPam2/g, a tear index of 4.83 mNm2/g and a tensile index of 26.72 Nm/g. This project expands the sources of natural cellulose fibers to an eco-friendly and sustainable one and opens up new applications for cow dung.

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SHAN-CONG, HUANG, LIU CHANG, DAI LEI, DOU SHENG, DING MING-QI, and XIA XIN-XING. "Control of malodorous gases emission from wet-end white water with hydrogen peroxide." October 2021 20, no. 10 (November 1, 2021): 615–22. http://dx.doi.org/10.32964/tj20.10.615.

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White water is highly recycled in the papermaking process so that its quality is easily deteriorated, thus producing lots of malodorous gases that are extremely harmful to human health and the environment. In this paper, the effect of hydrogen peroxide (H2O2) on the control of malodorous gases released from white water was investigated. The results showed that the released amount of total volatile organic compounds (TVOC) decreased gradually with the increase of H2O2 dosage. Specifically, the TVOC emission reached the minimum as the H2O2 dosage was 1.5 mmol/L, and meanwhile, the hydrogen sulfide (H2S) and ammonia (NH3) were almost completely removed. It was also found that pH had little effect on the release of TVOC as H2O2 was added, but it evidently affect-ed the release of H2S and NH3. When the pH value of the white water was changed to 4.0 or 9.0, the emission of TVOC decreased slightly, while both H2S and NH3 were completely removed in both cases. The ferrous ions (Fe2+) and the copper ions (Cu2+) were found to promote the generation of hydroxyl radicals (HO•) out of H2O2, enhancing its inhibition on the release of malodorous gases from white water. The Fe2+/H2O2 system and Cu2+/H2O2 system exhibited similar efficiency in inhibiting the TVOC releasing, whereas the Cu2+/H2O2 system showed better perfor-mance in removing H2S and NH3.

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Pathak, Puneet, Varun Kumar, Nishi Kant Bhardwaj, and Chhavi Sharma. "Slime control in paper mill using biological agents as biocides." Physical Sciences Reviews 6, no. 6 (April 30, 2021): 149–73. http://dx.doi.org/10.1515/psr-2019-0049.

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Abstract The environmental conditions of paper mills are suitable for the growth of slime-forming microorganisms due to the supply of nutrients, favorable temperature, and moisture. The slime formation causes the spoilage of raw materials & additives, breaks in the paper during papermaking, loss of production, reduces the hygienic quality of the end products, produces off-spec and rejected products, creates microbiological corrosion, and produces harmful gases. The main microorganisms are Bacteria (mainly Bacillus spp., Achromobacter spp., Enterobacter spp., Pseudomonas spp., Clostridium, etc.), Fungi (Aspergillus, Penicillium, Saccharomyces, etc.), and Algae. Besides the use of conventional toxic chemical biocides or slimicides, slime formation can also be controlled in an eco-friendly way using enzymes, bacteriophages, biodispersants, and biocontrol agents alone or along with biocides to remove the slime. Enzymes have shown their effectiveness over conventional chemicals due to nontoxic and biodegradable nature to provide clean and sustainable technology. Globally enzymes are being used at some of the paper mills and many enzymatic products are presently being prepared and under the trail at laboratory scale. The specificity of enzymes to degrade a specific substrate is the main drawback of controlling the mixed population of microorganisms present in slime. The enzyme has the potential to provide the chemical biocide-free solution as a useful alternative in the future with the development of new technologies. Microorganisms control in the paper mill may appear as a costly offer but the cost of uncontrolled microbial growth can be much higher leading to slime production and large economic drain.

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Hu, Song, Jigeng Li, Mengna Hong, and Yi Man. "ANALYSIS OF ENERGY SAVING AND EMISSION REDUCTION OF SECONDARY FIBER MILL BASED ON DATA MINING." Journal of Environmental Engineering and Landscape Management 29, no. 2 (May 13, 2021): 85–93. http://dx.doi.org/10.3846/jeelm.2021.14219.

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Waste paper recycling is an important way to realize the environmental protection development of the papermaking industry. The quality of the pulp will affect the pulp sales of the secondary fiber paper mills. The waste paper pulp can be adjusted by controlling the pulping process working conditions, but the working conditions of the waste paper pulping process have too many parameters. And the parameters are coupled with each other, it is difficult to control. In order to find the best working conditions and improve the quality of the pulp, this study uses the association rules algorithm to optimize the parameters for the waste paper pulping process. These parameters are power of refiner, waste paper concentration of refiner, the volume of slurry that enters deinked process, deinking agent amount, deinking time, deinking temperature, bleaching agent amount, bleaching time, and bleaching temperature. The test results show that the qualified rate of the pulp produced under the improved working conditions is 92.56%, an increase of 6.93%, and the average electricity consumption per ton of pulp is reduced by 5.76 kWh/t. In addition to potential economic benefits, this method can reduce carbon emissions.

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Chen, Qi Jie, Ping Wang, and Yong Xiang Yan. "Study on the High Charge Density Polyamine System in Controlling Dissolved and Colloidal Substances of High-Yield Pulp." Advanced Materials Research 236-238 (May 2011): 1363–66. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1363.

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In recent years High yield pulp (HYP) is being used at an increasing rate to replace bleached hardwood kraft pulp in the manufacturing of high quality paper products. However, HYP has more dissolved and colloidal substances (DCS), when compared with fully bleached kraft pulp. In general these DCS have an anionic character, and they often disturb the papermaking process. In the paper, the effects of high charge density polyamine (PA) single, dual and triple system on DCS control in high yield pulp were studied. The results showed that the DCS control effects of the PA/HCS (high cationic starch)/CPAM (cationic polyacrylamide) triple system were better than the PA/HCS dual system and the PA single system. In the PA/HCS/CPAM triple system, when the dosage of the PA was 0.06% and the dosage was 0.1% and 0.05% for HCS and CPAM, respectively, the zeta potential of pulp increased by a certain degree, drainage property of pulp improved remarkably, the turbidity of the DCS water was near to zero, and the cationic demand of DCS water decreased by 70.8%. The microscope photograph of fibers also confirmed that the polymers in the PA/HCS/CPAM triple system had very good synergetic effects on the removal of DCS in high yield pulp.

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"118 Mill-wide on-line simulation and analysis of quality variations in papermaking processes." Control Engineering Practice 1, no. 5 (October 1993): 895. http://dx.doi.org/10.1016/0967-0661(93)90374-z.

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Книги з теми "Papermaking Quality control"

Puumalainen, Pertti. Paperin laadun ja siihen valmistusprosessissa vaikuttavien tekijöiden on-line mittaukset. Lappeenranta: Lappeenrannan teknillinen korkeakoulu, 1993.

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Jaehn, Al. Quality improvement team handbook. Atlanta, GA: Tappi Press, 1997.

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Managing Quality: Techniques for Measuring, Controlling, and Monitoring Paper Quality Seminar (1987 Elizabeth, N.J.). 1987 Managing Quality, Techniques for Measuring, Controlling, and Monitoring Paper Quality Seminar: Sheraton Newark Airport, Elizabeth, NJ, October 11-14. Atlanta, GA, USA: TAPPI Press, 1987.

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Process, and Product Quality Conference (1993 Atlanta GA). 1993 Process and Product Quality Conference, Ritz-Carlton Buckhead, Atlanta, Ga., October 31-November 3: Proceedings. Atlanta, GA: TAPPI Press, 1993.

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International, Process and Product Quality Conference (1990 Copthorne England). 1990 International Process and Product Quality Conference: Effingham Park Gatwick Conference Center, Copthorne, England, October 16-18. Atlanta, GA, USA: TAPPI Press, 1990.

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Process and Product Quality Conference (1994 Savannah, Ga.). 1994 Process and Product Quality Conference, Hyatt Regency, Savannah, Georgia, October 17-20: Proceedings. Atlanta, GA: TAPPI Press, 1994.

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Process, and Product Quality Division Symposium (1991 Rochester N. Y. ). Proceedings, 1991 Process & Product Quality Division Symposium: Holiday Inn Genessee Plaza, Rochester, NY, October 29-31. Atlanta, GA: TAPPI Press, 1991.

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Process, and Product Quality Conference (1992 Appleton Wis ). 1992 Process and Product Quality Conference: Paper Valley Hotel, Appleton, WI, October 26-29. Atlanta, GA: TAPPI Press, 1992.

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Process and Product Quality Division Symposium (1989 New Orleans, La.). 1989 Process and Product Quality Division Symposium, New Orleans Marriott, New Orleans LA, October 1-4. Atlanta, GA, USA: Tappi Press, 1989.

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Paper Machine Audits Short Course (2001 Destin, Florida). 2001 paper machine audits short course: Hilton Sandestin Hotel, Destin, Florida, January 22-24, 2001. Atlanta, GA: TAPPI Press, 2001.

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Більше джерел

Тези доповідей конференцій з теми "Papermaking Quality control"

Rudolf, Maja, Irena Bates, Ivana Plazonić, Valentina Radić Seleš, Katja Petric Maretić, and Marija Magdalena Mendeš. "Evaluation of the line and edge quality of printed letters on recycled paper with straw pulp." 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-p33.

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Traditional papermaking is based on the use of an aqueous suspension consisting of cellulose fibres obtained by processing wood, non-wood plants or waste paper. With growing environmental concerns regarding deforestation and CO2 production, the paper industry has been always looking for new sources of non-wood pulp that would produce papers of similar quality to those made from wood pulp. Cereal straw from wheat, barley or triticale crops that remains on fields as a residue after grain harvesting has proven to be a good substitute for virgin wood fibres needed in the production of recycled paper. In this study, the quality of printed text on recycled paper with added straw pulp is evaluated mainly based on the line and edge characteristics of the printed letters. For this purpose, three types of laboratory paper substrates were first prepared using recycled wood pulp with the addition of 30% wheat, barley, or triticale straw pulp. The same letter pattern was printed with black ink on each paper substrate at a standard size of 12 pt with two common typefaces: Arial and Times New Roman. The quality of the printed letters was assessed through the measured print quality parameters such as blurriness, raggedness, fill and contrast. The resulting measurements were compared with the results obtained on the reference and control samples made exclusively from recycled wood pulp as a substrate from laboratory and commercial production. In terms of fill and contrast values, the uniformity of lines printed on the recycled papers with added straw pulp is the same or very similar to the reference and control papers. Letters printed in Arial (sans-serif) typeface show slightly better reproduction quality than letters printed in Times New Roman (serif) typeface. The measured parameters blurriness and raggedness of all laboratory-made paper substrates (with and without straw pulp) had similar values between 0.17 mm and 0.20 mm, resulting in a very similar reproduction quality compared to the reference paper substrate.

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