Wood chip pretreatment method and pulping method for grey paperboard production

A grey board and pretreatment technology, applied in pulp beating/refining method, pretreatment with alkaline compounds, raw material pretreatment, etc., can solve the problems of high energy consumption for refining and poor pulp quality, and improve pulp quality. , easy to operate, improve the effect of beating degree

Active Publication Date: 2021-06-18
DONGGUAN JINTIAN PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of high refining energy consumption and poor pulp quality in the existing mechanical wood pulp production process, the present invention provides a wood chip pretreatment method and a pulping method for gray cardboard production, which are simple to operate and can effectively improve the mechanical wood pulp production process. quality and reduced refining energy consumption

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  • Wood chip pretreatment method and pulping method for grey paperboard production
  • Wood chip pretreatment method and pulping method for grey paperboard production

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: a kind of wood chip pretreatment method for gray cardboard production comprises the following steps:

[0028] (1) Chipping, cutting wood chips by a chipper, controlling the length of the wood chips to be 45mm, the width to be 30mm, and the thickness to be 5mm;

[0029] (2) Screen wood chips, use a wood chip sieve to screen the wood chips, and remove the coarse wood chips and debris on the surface of the wood chips to obtain qualified wood chips, which are transported to the wood chip yard by a belt conveyor;

[0030] (3) Spray caustic soda solution. During the process of conveying qualified wood chips by the belt conveyor, use a spray device to evenly spray caustic soda solution on the wood chips to fully wet the wood chips. It will weaken the bonding force between fibers, reduce the softening temperature of hemicellulose and lignin, and make the softening effect of wood chips better;

[0031] (4) Storage: After spraying the caustic soda solution, the woo...

Embodiment 2

[0041] Embodiment 2: a kind of wood chip pretreatment method for gray cardboard production, comprises the following steps:

[0042] (1) Chipping, cutting wood chips by a chipper, controlling the length of the wood chips to be 45mm, the width to be 30mm, and the thickness to be 5mm;

[0043] (2) Screen wood chips, use a wood chip sieve to screen the wood chips, and remove the coarse wood chips and debris on the surface of the wood chips to obtain qualified wood chips, which are transported to the wood chip yard by a belt conveyor;

[0044] (3) Spray caustic soda solution. During the process of conveying qualified wood chips by the belt conveyor, use a spray device to evenly spray caustic soda solution on the wood chips to fully wet the wood chips. It will weaken the bonding force between fibers, reduce the softening temperature of hemicellulose and lignin, and make the softening effect of wood chips better;

[0045] (4) Storage: After spraying the caustic soda solution, the wo...

Embodiment 3

[0055] Embodiment 3: a kind of wood chip pretreatment method for gray cardboard production, comprises the following steps:

[0056] (1) Chipping, cutting wood chips by a chipper, controlling the length of the wood chips to be 45mm, the width to be 30mm, and the thickness to be 5mm;

[0057] (2) Screen wood chips, use a wood chip sieve to screen the wood chips, and remove the coarse wood chips and debris on the surface of the wood chips to obtain qualified wood chips, which are transported to the wood chip yard by a belt conveyor;

[0058] (3) Spray caustic soda solution. During the process of conveying qualified wood chips by the belt conveyor, use a spray device to evenly spray caustic soda solution on the wood chips to fully wet the wood chips. It will weaken the bonding force between fibers, reduce the softening temperature of hemicellulose and lignin, and make the softening effect of wood chips better;

[0059] (4) Storage: After spraying the caustic soda solution, the wo...

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Abstract

The invention relates to a wood chip pretreatment method for grey paperboard production, which comprises the following steps of: cutting wood chips by a chipping machine; screening the wood chips by a wood chip sieve to obtain qualified wood chips; uniformly spraying a caustic soda solution on the wood chips in the process of conveying the qualified wood chips by a belt conveyor; fully wetting the wood chips; and falling down the wood chips to a wood chip storage yard for storage. According to the wood chip pretreatment method for grey paperboard production, the surface of the wood chip is fully wetted through the caustic soda solution; the softening effect of the wood chip is promoted; the pulping energy consumption is reduced in the follow-up pulping production; the pulping degree of paper pulp and the fibrillation degree of fiber are improved; and therefore the quality of the paper pulp is improved.

Description

technical field [0001] The invention relates to the technical field of pulping in the papermaking industry, in particular to a wood chip pretreatment method and a pulping method for gray cardboard production. Background technique [0002] Gray cardboard is a kind of industrial cardboard with a wide range of uses. The common gray cardboard is composed of surface layer, core layer and bottom layer. Generally, waste paper and mechanical wood pulp are used as raw materials to produce the core layer of gray cardboard. The quality indicators of gray cardboard: important indicators such as weight, thickness, stiffness, and roughness are closely related to the quality of mechanical wood pulp. When mechanical wood pulp is used to produce gray cardboard, gray cardboard is prone to quality problems such as large quantitative fluctuations, thickness differences, poor roughness, and poor stiffness. The main reason for these problems is that mechanical wood pulp uses mechanical methods to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/02D21B1/06D21C1/06D21C7/00D21D1/20D21D5/02
CPCD21B1/02D21B1/06D21C7/00D21D1/20D21D5/02D21C1/06
Inventor 袁毅甘延文陈全张健
Owner DONGGUAN JINTIAN PAPER CO LTD
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