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A process to improve the drain age rate and retention of fines during paper making

A technology of water filtration and speed, applied in papermaking, non-fibrous pulp addition, textile and papermaking, etc., can solve problems such as uneconomical and ineffective polyacrylamide

Inactive Publication Date: 2001-09-12
BETZEARBORN INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In "Retention Aids for Quality Improvements in Newsprint", D.S. Honig, 1988 Paper Makers Conference 219, based on numerous research articles on newsprint retention aids, The general conclusion is that conventional polyacrylamides (as single or composite component systems) are ineffective or uneconomical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Table 1 summarizes the results of the cationic starch / alum (cationic polyelectrolyte) / anionic polyacrylamide treatment sequence with and without colloidal silica. Additionally, the order of addition of cationic starch and alum was reversed. A control is also given when the alum is replaced by the EPI / DMA / EDA polycondensate. The materials used in Table 1 are as follows: cold water soluble amphoteric potato starch with a degree of cationic substitution of 0.3 mole %; ANPAM, a high molecular weight polyacrylamide with a sodium acrylate / acrylamide ratio of 30 mole %. In Table 1, all amounts listed in parentheses are in pounds per ton of active material. For control purposes, an untreated control and the EPI / DMA / EDA coagulant plus cationic polyacrylamide conventional dicationic treatment procedure were performed.

[0021] Table 1 Treatment CTD (Sec.) FPFR% PEVR Starch (20) / Alum (5) / 2.46 17.19 1.49 ANPAM (0.5) / Colloidal Silica (2) Starch (20) / Alum (5) 2.52 1...

Embodiment 2

[0024] In Table 2, the tests as summarized in Table 1 were repeated with a second batch of separately prepared ingredients. In addition, independent experiments with starch, ANPAM and alum were performed.

Embodiment 3

[0026] In Table 3, tests were performed to evaluate the effect of the amount of cationic starch. The data show a significant sensitivity of the drainage and retention responses to the amount of starch used when the formation indicator is held relatively constant.

[0027] Table 3 Treatment CTD(Sec.) FPFR% PEVR Starch (20) / EPI / DMA / EDA(0.5) / 3.18 22.80 1.15ANPAM(0.5)EPI / DMA / EDA(0.5) / Starch(20) 3.22 22.89 1.14 / ANPAM (0.5)Starch(10) / EPI / DMA / EDA(0.5) / 3.26 18.57 1.13ANPAM(0.5)EPI / DMA / EDA(0.5) / Starch 3.44 18.18 1.15(10) / ANPAM(0.5)Starch(5) / EPI / DMA / EDA 3.38 16.84 1.15(0.5) / ANPAM(0.5)EPI / DMA / EDA(0.5) / starch(5) / 3.47 17.84 1.16ANPAM(0.5)starch(0) / EPI / DMA / EDA(0.5) / 3.77 13.38 1.15ANPAM(0.5)EPI / DMA / EDA(0.5) / starch(0) / 3.77 13.38 1.15ANPAM(0.5)

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PUM

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Abstract

A method of improving drainage rate and retention of fines which is effective in unfilled, newsprint-type furnish without a silica / bentonite-type particle is disclosed. The method comprises adding a cationic or amphoteric starch, and a cationic polyelectrolyte followed by the addition of a high molecular weight anionic polyacrylamide copolymer.

Description

field of invention [0001] The present invention relates to the production of paper or board, in particular to a method of improving the retention and / or drainage of mechanical wood pulp-based furnishes in the formation of newsprint, catalog pulp, groundwood specialty pulp. Background of the invention [0002] The production of paper involves the forming and dewatering of a web of cellulosic fibers and optional fillers, usually in the presence of additives capable of improving the end product or paper production. Many grades of paper include higher levels of inorganic fillers such as kaolinite, calcium carbonate and titanium dioxide. For example, premium paper, often called fine paper, can be made from high-grade bleached chemical pulp and can contain 5-35% inorganic fillers by dry paper weight. In the production of this paper, the use of retention and drainage aids is common. Such retention and drainage aids have been proven for some time to be cost-effective and effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/10D21H11/08D21H17/07D21H17/29D21H17/37D21H17/42D21H17/44D21H17/45D21H17/55D21H17/56D21H17/66D21H21/06D21H23/04D21H23/14D21H23/76
CPCD21H17/55D21H17/07D21H17/56D21H17/29D21H17/66D21H23/765D21H17/44D21H11/08D21H17/42D21H21/10D21H17/375
Inventor 弗兰克·J·苏特曼理查德·A·霍比克
Owner BETZEARBORN INC
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