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Method for fill feeding in papermaking

A calcium carbonate filler, high-efficiency technology, applied in the field of papermaking industry, can solve the problems of reduced strength and sizing degree, difficult to achieve paper ash content, increased chemical consumption, etc., to improve ash content, surface strength and wire filler retention rate Improvement and reduction of drying steam consumption

Active Publication Date: 2012-09-19
YUEYANG FOREST & PAPER CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, increasing the amount of filler will reduce the strength and sizing degree of the paper sheet, and at the same time, the retention of the wire part will decrease, the amount of chemicals will increase, and the wear of the wire will increase.
Therefore, it is difficult to achieve ash content of more than 30% in paper pulp directly

Method used

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  • Method for fill feeding in papermaking
  • Method for fill feeding in papermaking

Examples

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Effect test

Embodiment 1

[0017] Light offset paper (quantitative 75g / m 2 ) according to the ratio of 4% bleached kraft softwood pulp, 86% chemical mechanical pulp (APMP), and 10% CTMP pulp; the beating concentration of bleached kraft softwood pulp is 3.0±0.5%, and the beating degree is 45±2 0 SR; chemical mechanical pulp (APMP) beating concentration 2.5-4.0%, beating degree ≥ 42 0 Sr. The filler is light calcium carbonate, quaternary ammonium cationic starch: the concentration is 1%, the ratio of starch to filler is 1:100, the light calcium carbonate is filtered through a 80-120 mesh multi-layer sieve, and mixed with cationic starch through a high-efficiency mixer to sieve , and then join the paper machine sieve together. Addition of retention aid PAM: 0.52kg / T paper, cationic starch addition: 9.5 kg / T paper, AKD addition: 11 kg / T paper, of which 5.5 kg / T paper in pulp, 5.5 kg surface sizing / T paper. From the test results of the wet end, after using filler + starch pre-flocculation, the retention...

Embodiment 2

[0020] Lightweight offset paper (quantitative 65g / m 2 ) according to the ratio of 4% bleached kraft softwood pulp, 80% chemical mechanical pulp (APMP), and 16% CTMP pulp; the beating concentration of bleached kraft softwood pulp is 3.0±0.5%, and the beating degree is 45±2 0 SR; chemical mechanical pulp (APMP) beating concentration 2.5-4.0%, beating degree ≥ 42 0 Sr. The filler is heavy calcium carbonate, quaternary ammonium cationic starch: the concentration is 1%, the ratio of starch to filler is 0.5:100, the heavy calcium carbonate is filtered through a 80-120 mesh multi-layer sieve, and then mixed with cationic starch and sieved through a high-efficiency mixer , and then join the paper machine sieve together. Addition of retention aid PAM: 0.50kg / T paper, cationic starch addition: 9.6 kg / T paper, AKD addition: 10 kg / T paper, of which 5.0 kg / T paper for pulp, 5.0 kg for surface sizing / T paper. From the test results of the wet end, after using filler + starch pre-floccul...

Embodiment 3

[0022] Light offset paper (quantitative 75g / m 2 ) according to the ratio of 4% bleached kraft softwood pulp, 86% chemical mechanical pulp (APMP), and 10% CTMP pulp; the beating concentration of bleached kraft softwood pulp is 3.0±0.5%, and the beating degree is 45±2 0 SR; chemical mechanical pulp (APMP) beating concentration 2.5-4.0%, beating degree ≥ 42 0 Sr. The filler is light calcium carbonate and heavy calcium carbonate (filler ratio: light calcium: heavy calcium = 50:50), quaternary ammonium cationic starch: concentration 1%, starch to filler ratio 0.5:100, calcium carbonate through 80-120 After being filtered through a multi-mesh sieve, it is mixed with cationic starch and sieved through a high-efficiency mixer, and then added to the paper machine sieve together. Addition of retention aid PAM: 0.52kg / T paper, cationic starch addition: 9.6 kg / T paper, AKD addition: 11 kg / T paper, of which 5.5 kg / T paper in the pulp, 5.5kg surface sizing / T paper. From the test result...

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Abstract

The invention discloses a method for fill feeding in papermaking, which is characterized by comprising the following steps of: (1) firstly gelatinizing quaternary ammonium type cation starch, diluting to 1-3 percent concentration, conveying to a high-efficient mixer by a piston pump; conveying calcium carbonate with 10-30 percent concentration to the high-efficient mixer by a centrifugal pump; and (2) completing pre-flocculation of the quaternary ammonium type cation starch and the calcium carbonate in the high-efficient mixer, conducting multilayer filtering on the pre-flocculation bodies in the mixer, thus obtaining the pre-flocculation bodies with proper granules. With the adoption of the method, on the premise that the strength property of paper is guaranteed, the ash content can be effectively improved, the ash content of facial gummed paper can be improved from 25% to 35%, and the dry steam consumption can be reduced by 10%, moreover, the fiber materials can be greatly reduced, thus the method has wide application prospects.

Description

technical field [0001] The invention relates to a method for adding fillers in papermaking, and belongs to the technical field of papermaking industry. Background technique [0002] High filling capacity has become one of the important development trends of papermaking technology. Increasing the amount of filler in the papermaking process can save the consumption of raw materials, reduce the consumption of steam in the drying process, and improve the optical properties and printing suitability of paper. However, if the amount of filler is increased, the strength and sizing degree of the paper sheet will decrease, while the retention of the wire part will decrease, the amount of chemicals will increase, and the wear of the wire will increase. Therefore, it is difficult to achieve more than 30% paper ash content by directly filling the papermaking pulp. Contents of the invention [0003] The purpose of the present invention is to provide a papermaking high-filling method t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H23/76D21H23/78
Inventor 陈金山李庆秋刘春景贺晓文刘成良李嘉微
Owner YUEYANG FOREST & PAPER CO LTD
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