Surface sizing with cationic starch: its effect on paper quality and the papermaking process.Application: To solve problems associated with oxidized oxidized having been modified by the process of oxidation. oxidized cellulose see absorbable cellulose. starches, we prepared cationic cationic having qualities dependent on having free cations available. cationic detergents are wetting agents that disrupt or damage cell membranes, denature proteins and inactivate enzymes. starches and investigated their effects on paper properties and papermaking processes in laboratory and mill settings. Characteristics of starches used in surface sizing greatly affects not only paper properties but also the efficiency of broke recycling processes. Oxidized starches commonly used for surface sizing have disadvantages in improving paper properties since they tend to penetrate deeply into the paper structure rather than remaining on the surface. Furthermore, oxidized starches act as anionic an·i·on n. A negatively charged ion, especially the ion that migrates to an anode in electrolysis. [From Greek, neuter present participle of anienai, to go up : ana-, ana- trash in the broke recycling process. Our study used four cationic starches (CS) with different degrees of substitution (DS) and viscosity, ammonium persulfate starch, and oxidized starch. We determined optical and strength properties of surface sized paper after surface sizing. We also measured printing properties and the effect of starch types on broke. Results showed that cationic starches have significant effects in improving opacity Refers to being "opaque," which means to prevent light from shining through. For example, in an image editing program, the opacity level for some function might range from completely transparent (0) to completely opaque (100). , brightness, print gloss, and ink density due to their better holdout property on paper surface. The coating layer formed on the substrate surface sized with cationic starches (versus oxidized starch) had greater pore volume. Surface sizing with cationic starch improved brightness and opacity for coated papers. We examined the benefits of using cationic starch at the size press on a paper machine equipped with a film transfer size press. Improvement in stiffness, opacity, brightness, printing quality, and picking resistance was observed when cationic starch was used in the film transfer size press, which allowed the use of more filler for cost reduction. Cationic size press starch improved internal bond strength, also. We noted diverse beneficial effects of improving white water quality when cationic size press starch was used, also. Hak Lae Lee and Shin are with the Department of Forest Products, Seoul National University Not to be confused with the University of Seoul. Seoul National University (SNU) is a national research university in Seoul, South Korea. Founded in 1946, SNU was the first national university in South Korea, and served as a model for the many national and public , Suwon, 441-744; Koh and Ryu Ryū (竜 or りゅう or リュウ Ryū are with Samyang Genex Corp., 285, Gajwa-Dong, Seo-Gu, Inchon, 204-350; Dong-Ju Lee is with Hansol Paper Mfg. Co. Ltd., 481-8, Whachon-Ri, Changhang Up, 325-908; Sohn is with Hansel han·sel n. & v. Variant of handsel. Institute of Science and Technology, San 56-1, Oeibang-Ri, Namyangju, 472-850; all in the Republic of Korea. Address correspondence to Lee by email at lhakl@plaza.snu.ac.kr |
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