High-whiteness yellowing-resistant coated ivory board and preparation method thereof

A technology of cloth white cardboard and high whiteness, which is applied in the field of high whiteness anti-yellowing coated white cardboard and its preparation, which can solve the problems of low paper strength, unnaturalness, dazzling paper hue and visual sense, etc., and achieve improvement Resistance to yellowing and the effect of reducing paper odor

Active Publication Date: 2020-06-12
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 pap

Method used

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  • High-whiteness yellowing-resistant coated ivory board and preparation method thereof
  • High-whiteness yellowing-resistant coated ivory board and preparation method thereof
  • High-whiteness yellowing-resistant coated ivory board and preparation method thereof

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preparation example Construction

[0041] The invention provides a preparation method of high-whiteness coated yellow-returning-resistant white cardboard, comprising: S1) pulp treatment: after bleaching kraft hardwood pulp is mixed with a first biological enzyme for treatment, after pulping treatment, Obtain broad-leaf fiber pulp; mix bleached kraft softwood pulp with a second biological enzyme for treatment, and then undergo pulping treatment to obtain soft-leaf fiber pulp; or bleach kraft broad-leaf pulp and bleached kraft softwood pulp After the mixed wood pulp is mixed with the second biological enzyme for treatment, it is refined to obtain mixed fiber pulp; the first biological enzyme and the second biological enzyme are each independently selected from cellulase and / or hemicellulase ; S2) slurry mixing: mixing one or more of the broadleaf fiber slurry, coniferous fiber slurry and mixed fiber slurry to obtain surface layer slurry; One or more of the slurry and the mixed fiber slurry are mixed with the fluo...

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 the pulper 1, and add 1.5kg / ton of kraft pulp to the pre-grinding tank 1 in terms of dry pulp. Dry pulp cellulase, after the slurry is treated with biological enzymes in the pre-grinding pool 1 for 100 minutes, the concentration is adjusted to a refining concentration of 4.25%, and sent to the disc mill 1 refining machine for refining treatment, and the freeness after refining is controlled to 539ml. Get Fiber 1.

[0068] Bleached kraft hardwood pulp 2: Dilute and disintegrate the air-dried bleached kraft hardwood pulp board in the pulper 2 at a concentration of 5%. Dry pulp cellulase, after the slurry is treated with biological enzymes in the pre-grinding pool 2 for 110 minutes, the concentration is adjusted to a re...

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 the pulper 1, and add 1.5kg / ton of kraft pulp to the pre-grinding tank 1 in terms of dry pulp. Dry pulp cellulase, after the slurry is treated with biological enzymes in the pre-grinding pool 1 for 100 minutes, the concentration is adjusted to a refining concentration of 4.14%, and sent to the disc mill 1 refining machine for refining treatment, and the freeness after refining is controlled to 531ml. Get Fiber 1.

[0089] Bleached kraft hardwood pulp 2: Dilute and disintegrate the air-dried bleached kraft hardwood pulp board in the pulper 2 at a concentration of 5%. Dry pulp cellulase, after the slurry is treated with biological enzymes in the pre-grinding pool 2 for 110 minutes, the concentration is adjusted to a ref...

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Abstract

The invention provides a high-whiteness yellowing-resistant coated ivory board and a preparation method thereof. Firstly wood pulp is pretreated by using biological enzyme, the pulp grinding degree ofthe pulp can be greatly reduced and thus the pulping energy consumption is reduced; the whiteness of the paper can be indirectly improved by improving the opacity of the pulp, and the bulk of the paper can be improved on the premise of ensuring the strength index of the paper so that the dependence on mechanical pulp is greatly reduced, the ratio of bleached sulfate hardwood pulp to bleached sulfate softwood pulp can be increased, and the use of a fluorescent whitening agent in the pulp is reduced; in addition, the fluorescent whitening agent is added into the core layer pulp and the surfacesizing material so that the whitening effect can be improved, the dosage of the fluorescent whitening agent in the pulp is further reduced, the rapid adjustment of the whiteness of the raw paper is realized, and the raw paper layer with uniform and stable whiteness is obtained; the use amount of the fluorescent whitening agent in the ivory board pulp is small through the adjustment, the whitenessand hue adjusting speed is high, the control is stable, the natural and soft perception is shown under the ultrahigh whiteness, and the yellowing resistance is good.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a high-whiteness anti-yellowing 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 factors such as the type of fluorescent whitening agent, pulp whiteness, pulp lignin content, cationic chemicals, system pH, and fillers. In order to give full play to the whitening effect of fluorescent whitening agents and improve the whiteness of paper, the influencing factors such as fluorescent whitening agent type, cationic chemicals, system pH, and fillers can be optimized through relatively simple process design. However, pulp whiteness and pulp lignin content are affected by the d...

Claims

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Application Information

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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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