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A kind of high whiteness anti-yellowing coated white cardboard and its preparation method

A cloth white card and high whiteness technology, which is applied in the field of high whiteness and anti-yellowing coated white cardboard and its preparation, can solve the problems of large loss of production, unnaturalness, high paper whiteness, etc., and reduce pulp refining. Energy consumption, increased opacity, reduced refining effect

Active Publication Date: 2022-03-25
ASIA SYMBOL SHANDONG PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of process will have many adverse effects on product quality and paper machine operation: first, it is not only difficult to achieve high paper whiteness, but also not conducive to the stable control of paper hue; second, paper hue is more visually sensitive. Dazzling, not soft, unnatural; Third, after a large amount of fluorescent whitening agent enters the white water system of the paper machine, it not only increases the cost of wastewater treatment, but also requires a long time transition or shutdown for cleaning when changing production of non-fluorescent products. Cause greater loss in production; Fourth, paper is more prone to serious yellowing under light induction and heat induction; Fifth, paper has low strength, poor toughness, and poor surface smoothness and fineness

Method used

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  • A kind of high whiteness anti-yellowing coated white cardboard and its preparation method
  • A kind of high whiteness anti-yellowing coated white cardboard and its preparation method
  • A kind of high whiteness anti-yellowing coated white cardboard and its preparation method

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preparation example Construction

[0041] The present invention provides a method for preparing high-brightness coated paperboard with resistance to yellowing and whitening, comprising: S1) Slurry treatment: after mixing bleached sulfate hardwood pulp and a first biological enzyme for treatment, refining the pulp, Obtaining hardwood fiber pulp; mixing bleached sulfate softwood pulp with a second biological enzyme for treatment, and refining to obtain softwood fiber pulp; or mixing bleached sulfate hardwood pulp and bleached sulfate softwood pulp After the mixed wood pulp is mixed with the second biological enzyme for treatment, the pulp is refined to obtain a mixed fiber slurry; the first biological enzyme and the second biological enzyme are independently selected from cellulase and / or hemicellulase ; S2) slurry mixing: one or more of the broad-leaved fiber slurry, the soft-leaved fiber slurry and the mixed fiber slurry are mixed to obtain a surface layer slurry; the broad-leaved fiber slurry, the soft-leaved f...

Embodiment 1

[0065] according to figure 2 The manufacturing process shown includes the following steps:

[0066] 1) Fiber treatment

[0067] Bleached kraft hardwood pulp 1: dilute and disintegrate the air-dried bleached kraft hardwood pulp board at a concentration of 5% in pulper 1, and add 1.5kg / ton of absolute dry pulp to tank 1 before grinding. Dry pulp cellulase, the pulp is treated with biological enzymes in the pre-milling tank 1 for 100 minutes, and the concentration is adjusted to 4.25%, and then sent to the disc mill 1 for refining treatment, and the freeness after refining is controlled to 539ml, fiber 1.

[0068] Bleached kraft hardwood pulp 2: dilute and disintegrate the air-dried bleached kraft hardwood pulp board at a concentration of 5% in pulper 2, and add 1.5kg / ton of absolute dry pulp to tank 2 before grinding. Dry pulp cellulase, the pulp is treated with biological enzymes in the pre-milling tank 2 for 110 minutes, and the concentration is adjusted to 4.22%, and then...

Embodiment 2

[0086] according to image 3 The manufacturing process shown includes the following steps:

[0087] 1) Fiber treatment

[0088] Bleached kraft hardwood pulp 1: dilute and disintegrate the air-dried bleached kraft hardwood pulp board at a concentration of 5% in pulper 1, and add 1.5kg / ton of absolute dry pulp to tank 1 before grinding. Dry pulp cellulase, the pulp was treated with biological enzymes in the pre-milling tank 1 for 100 minutes, and the concentration was adjusted to 4.14%, and the pulp was sent to the disc mill 1 for refining treatment, and the freeness after refining was controlled to 531ml. fiber 1.

[0089] Bleached kraft hardwood pulp 2: dilute and disintegrate the air-dried bleached kraft hardwood pulp board at a concentration of 5% in pulper 2, and add 1.5kg / ton of absolute dry pulp to tank 2 before grinding. Dry pulp cellulase, the pulp is treated with biological enzymes in the pre-milling tank 2 for 110 minutes, and the concentration is adjusted to 3.92%...

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Abstract

The invention provides a high-whiteness anti-yellowing coated white cardboard and a preparation method thereof. First, the wood pulp is pretreated with biological enzymes, which can greatly reduce the degree of pulp refining, thereby reducing the energy consumption of pulp refining. It can also indirectly improve the whiteness of paper by increasing the opacity of the pulp, and can also increase its bulk under the premise of ensuring the paper strength index, thereby greatly reducing the dependence on mechanical pulp, thus improving the bleaching of kraft hardwood pulp and bleaching sulfuric acid. Increase the proportion of salt softwood pulp, thereby reducing the use of fluorescent whitening agents in the pulp; moreover, adding fluorescent whitening agents to the core layer pulp and surface sizing compound can improve the whitening effect and further reduce the fluorescent whitening in the pulp. The amount of fluorescent whitening agent used, and the rapid adjustment of the whiteness of the base paper can be achieved, and a base paper layer with uniform whiteness and stability can be obtained; through the above adjustment, the amount of fluorescent whitening agent in the white card pulp is reduced, and the adjustment speed of whiteness and hue is fast and the control is stable. It presents a natural and soft appearance under ultra-high whiteness, and has good resistance to yellowing.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a high whiteness and yellowing-resistant coated white cardboard and a preparation method thereof. Background technique [0002] In the production of coated white cardboard, fluorescent whitening agents are usually added to the slurry and coating to improve the whiteness of the paper. The whitening effect of the fluorescent whitening agent added to the pulp on paper is mainly affected by the type of fluorescent whitening agent, the whiteness of the pulp, the lignin content of the pulp, cationic chemicals, system pH, fillers and other factors. In order to better exert the whitening effect of the fluorescent whitening agent to improve the whiteness of the paper, the influencing factors such as the type of fluorescent whitening agent, cationic chemicals, system pH, and filler can be optimized through relatively simple process design. However, it is difficult to adjus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/00D21C5/00D21H11/04D21H21/30D21H21/16D21H19/10D21H17/28D21H19/84D21H19/38D21H19/40D21H19/58D21H19/54D21H19/44D21H19/56D21F11/04
CPCD21H27/00D21C5/005D21H11/04D21H21/30D21H21/16D21H19/10D21H17/28D21H19/84D21H19/385D21H19/40D21H19/58D21H19/54D21H19/44D21H19/56D21F11/04
Inventor 丁鹏翔张克庆王晶晶钱凯锋
Owner ASIA SYMBOL SHANDONG PULP & PAPER
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