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A kind of gray board paper and preparation method thereof

A technology for greyboard paper and pulp, applied in the field of pulping and papermaking, can solve the problems of unstable quality and low strength performance of greyboard paper, and achieve the effects of improving the bonding force between layers, saving the amount of fiber, and promoting bonding.

Active Publication Date: 2021-04-13
浙江金励环保纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quantitative, thickness, tightness, stiffness and other performance indicators of gray board paper are important standards for examining paper performance. There are still some deficiencies in the traditional papermaking process, resulting in unstable quality of gray board paper and low strength performance.

Method used

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  • A kind of gray board paper and preparation method thereof

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preparation example Construction

[0032] The preparation process of each slurry used in the present invention is as follows:

[0033] 1. MOW pulp production: Use mixed office waste paper, send it to the hydraulic pulper for crushing and separation through the chain plate conveyor, and the crushed pulp is pumped into the rougher, and then sent to the high-concentration desander to remove the coarser pulp. After impurity, deinking flotation, low-concentration sand removal, and pressure screening are carried out after coarse screening by the fiber separator. After the screening, the pulp is deconcentrated and sent to the double-disc refiner for beating, and then stored in the pulp tank;

[0034] 2. OCC pulp production: Use waste corrugated box cardboard, send it to the hydraulic pulper through the chain conveyor, and after crushing, enter the high-concentration desander to remove impurities such as sand, stones, iron, etc., and then separate the pulp from the fiber separator. After the slag is separated, low-conc...

Embodiment 1

[0039] A. Pulping step

[0040] MOW pulp is obtained by deinking the recovered mixed office waste paper;

[0041] OCC pulp is obtained by pulping, grading and screening recycled waste domestic corrugated boxboard, and the obtained long-fiber pulp is OCC pulp 长 , medium fiber pulp is OCC pulp 中 , the short fiber pulp is OCC pulp 短 ;

[0042] Wood waste is thermally treated to obtain mechanical wood pulp;

[0043] The papermaking sludge is purified and conditioned to obtain reused sludge;

[0044] B. Mixing step

[0045] Surface layer slurry: The mixed slurry of MOW pulp and recycled sludge is used as the surface layer slurry, and the weight ratio of the two is 19:1. In addition, the surface layer slurry also contains 1% of shell powder@alginic acid Sodium core-shell structure environmental protection filler, the surface layer slurry accounts for 20% of the total slurry;

[0046] Lining slurry: 100% OCC slurry 中 As the lining slurry, the lining slurry accounts for 15% of...

Embodiment 2

[0052] A. Pulping step

[0053] MOW pulp is obtained by deinking the recovered mixed office waste paper;

[0054] OCC pulp is obtained by pulping, grading and screening recycled waste domestic corrugated boxboard, and the obtained long-fiber pulp is OCC pulp 长 , medium fiber pulp is OCC pulp 中 , the short fiber pulp is OCC pulp 短 ;

[0055] Wood waste is thermally treated to obtain mechanical wood pulp;

[0056] The papermaking sludge is purified and conditioned to obtain reused sludge;

[0057] B. Mixing step

[0058] Surface layer slurry: The mixed slurry of MOW pulp and recycled sludge is used as the surface layer slurry, and the weight ratio of the two is 9:1. In addition, the surface layer slurry also contains 1% of shell powder@alginic acid Sodium core-shell structure environmental protection filler, the surface layer slurry accounts for 20% of the total slurry;

[0059] Lining slurry: 100% OCC slurry 中 As the lining slurry, the lining slurry accounts for 20% of ...

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Abstract

The invention relates to gray board paper and a preparation method thereof. The present invention uses waste as raw material, limits the composition and ratio of each layer of slurry, and innovatively uses environmentally friendly fillers to improve the slurry, fully exerts the synergistic effect between components, and improves the quality of gray board paper. Tightness, stiffness, interlayer bonding force and other properties can be obtained to obtain gray board paper products with excellent performance; the invention makes rational use of waste resources, simple process operation, energy saving and environmental protection, and has good market prospects.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to gray board paper and a preparation method thereof. Background technique [0002] Gray board paper is an environmentally friendly packaging material, which can be divided into single ash, double ash and all ash. Its manufacturing process mainly uses waste paper pulp as raw material, which can not only reduce production costs and reduce the consumption of the ecological environment, but also respond to the national The call for energy conservation and emission reduction, to achieve sustainable development. Therefore, gray board paper has become the preferred paper for printing and packaging industry substrates. The weight, thickness, tightness, stiffness and other performance indicators of gray board paper are important standards for examining paper performance. There are still some deficiencies in the traditional papermaking process, resulting in unstable quality ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/10D21H27/30B27K5/00B27K5/06B27L11/00D21B1/14D21B1/32D21B1/34D21D1/02D21D5/02D21F9/00D21H11/14D21H17/01D21H17/30D21H17/67
CPCB27K5/009B27K5/06B27L11/00D21B1/14D21B1/32D21B1/327D21B1/345D21D1/02D21D5/02D21F9/00D21H11/14D21H17/01D21H17/30D21H17/675D21H27/10D21H27/30Y02W30/64
Inventor 陈欢欢李彩鹏李文宾
Owner 浙江金励环保纸业有限公司