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Production method for craft paper

A production method and technology for kraft paperboard, applied in the field of papermaking, can solve the problems of insufficient compression resistance of cartons, high production cost and high power consumption, and achieve the effects of highlighting environmental protection advantages, increasing production costs and reducing yields

Active Publication Date: 2014-11-19
ZHEJIANG JINGXING PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of bleached wood pulp, forest resources are consumed and production costs are high
[0004] (2) At present, the deinking methods of waste paper are still mainly washing method and flotation method. The former needs to use a large amount of water, and the power consumption is high, and the pollution load of wastewater treatment is high, while the latter has high investment in equipment and is suitable for small ink The removal effect of particles is poor, the fiber loss is more, the fiber bonding performance is poor, and it causes serious problems such as paper machine foaming
[0005] (3) The strength performance is low, resulting in insufficient compressive performance of the carton
The main reason for the low strength performance is that the concentration of the refining process in the pulping process of most papermaking enterprises adopts the traditional low-consistency refining, resulting in excessive cutting of waste paper fibers

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Production method for craft paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Kraft cardboard is produced according to the method steps of the specific embodiment, wherein the MOW concentration in the first step is 10%-15%, the cellulase activity is 1700IU / ml, the pulping and deinking temperature is 40°C-50°C, and the pulping The time is 15-20min, the concentration of cellulase is 0.02-0.03%, Na 2 SiO 3 The concentration of NaOH is 0.5-0.7%, and the concentration of NaOH is 0.5-0.8%.

[0117] The average length of MOW long fibers in step 4 is 2.5mm, the average length of MOW short fibers is 0.5mm-1.5mm, the concentration of MOW long fiber pulp in step 5 is 13-15%, and the bleaching temperature is 60°C-65°C , the concentration of FAS is 0.3%-0.4%, the concentration of NaOH is 0.8%-1.0%, and the bleaching time is 40-50min. The wet weight of lining pulp is 2.5-3g, and the beating degree is 43-45°SR

[0118] In step 6, the concentration of the MOW long fiber pulp is 4.5%-4.7%, the wet weight of the refined MOW long fiber pulp is 5g-5.5g, and the b...

Embodiment 2

[0123] Other steps are all identical with embodiment 1, and only difference is that the proportion of surface slurry, liner slurry, core slurry and base slurry is 20%, 20%, 44%, 16%.

[0124]

Embodiment 3

[0126] Other steps are the same as in Example 1, the only difference is that the amount of cellulase is 0.03-0.04%, and the MOW pulping time is 10-15min.

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Abstract

The invention belongs to the technical field of papermaking, relates to a production method for craft paper, and aims to solve the problem of difficulty in the production of feather-weight, strong-strength and high-whiteness craft paper under the condition of not using wood pulp. The production method for the craft paper comprises steps of a MOW pretreatment step for forming surface pulp and lining pulp, an OCC pretreatment step for forming core pulp and prime pulp, and a step for subsequently treating the surface pulp, the lining pulp, the core pulp and the prime pulp, and is characterized in that the MOW pretreatment step comprises the following steps: a, simultaneously performing pulping and biological enzyme deinking on MOW, and b, performing heat dispersion on MOW, wherein the step a comprises a step of adding 1,600 to 1,800 IU / ml cellulase, Na2SiO3 and NaOH into MOW pulp at the mass concentration of 10 to 15 percent for pulping under the condition of 40 to 50 DEG C, wherein the mass concentration of the cellulase, the Na2SiO3 and the NaOH is 0.01 to 0.05 percent, 0.5 to 1.0 percent and 0.5 to 1.0 percent respectively, and the pulping time is 10 to 20 min. Due to the adoption of the technical scheme, the method can effectively solve the technical problem.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and relates to a production method of kraft cardboard. The MOW in the invention is mixed office waste paper, and the OCC is an old corrugated box. The concentration in the invention, unless otherwise specified, refers to mass percent concentration. Background technique [0002] White-faced kraft cardboard is a variety of white board paper, which is often used to make paper bags, record sleeves, envelopes, files and sandpaper. At present, the production technology of white flour linerboard mainly has the following problems: [0003] (1) There are two types of white-faced linerboard, one is linerboard with bleached wood pulp vermicelli, and the other is linerboard with surface coating. If there is no special description in the domestic market, it generally refers to the former. At present, in the production of white-faced kraftboard in China, bleached wood pulp is usually used for the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02D21B1/34D21F11/00
CPCY02W30/64
Inventor 徐清凉张小红沙力争陈华赵会芳
Owner ZHEJIANG JINGXING PAPER
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