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Process for preparing recovered pulp with high whiteness and high cleanliness

A technology with high cleanliness and preparation technology, which is applied in the field of papermaking raw material processing, and can solve the problems of dusty impurities and low pulp whiteness

Inactive Publication Date: 2012-09-19
DONGGUAN NINE DRAGONS PAPER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only is there a great dependence on high-quality office waste paper raw materials, but also the prepared pulp has low whiteness and a lot of dust impurities, which limits its use in the manufacture of low-grade cultural paper.

Method used

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  • Process for preparing recovered pulp with high whiteness and high cleanliness
  • Process for preparing recovered pulp with high whiteness and high cleanliness
  • Process for preparing recovered pulp with high whiteness and high cleanliness

Examples

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Effect test

Embodiment 1

[0051] The preparation process of a high-whiteness and high-cleanliness recycled pulp in this embodiment includes the following process steps: A. Waste paper raw material selection and feeding: the mass ratio of each waste paper raw material is US waste 37#: Japanese waste 5#: U.S. waste 10#: U.S. waste 8# is 20%: 40%: 30%: 10%, and it is put on the chain conveyor, and the waste paper raw materials are evenly put into the drum pulper after being processed by the bulk bag machine and the leveling roller; B , Disintegration: Add 0.4% NaOH, 0.6% NaOH to the disintegration area in the front section of the drum pulper 2 Sio 2 , 0.2% industrial soap and 0.03% H 2 o 2 , and then add white water at 70°C, so that the concentration of the disintegration zone is 20%, the temperature is 50°C, and the pH value is 9, and the waste paper raw material is gently pulped to obtain a slurry; C. Screening and purification: the slurry is firstly used Two-stage high-concentration slag remover for...

Embodiment 2

[0053]The preparation process of a high-whiteness and high-cleanliness recycled pulp in this embodiment includes the following process steps: A. Waste paper raw material selection and feeding: the mass ratio of each waste paper raw material is US waste 37#: Japanese waste 5#: U.S. waste 10#: U.S. waste 8# is 25%: 35%: 25%: 15%, and it is put on the chain conveyor, and the waste paper raw materials are evenly put into the drum pulper after being processed by the bulk bag machine and the leveling roller; B , Disintegration: add 0.5% NaOH, 0.65% NaOH to the disintegration area in the front section of the drum pulper 2 Sio 2 , 0.25% industrial soap and 0.05% H 2 o 2 , and then add white water at 75°C, so that the concentration of the disintegration zone is 21%, the temperature is 55°C, and the pH value is 10, and the waste paper raw material is gently pulped to obtain a slurry; C. Screening and purification: the slurry is firstly used Two-stage high-concentration slag remover f...

Embodiment 3

[0055] The preparation process of a high-whiteness and high-cleanliness recycled pulp in this embodiment includes the following process steps: A. Waste paper raw material selection and feeding: the mass ratio of each waste paper raw material is US waste 37#: Japanese waste 5#: U.S. waste 10#: U.S. waste 8# is 30%: 30%: 20%: 20%, and it is put on the chain conveyor, and the waste paper raw materials are evenly put into the drum pulper after being processed by the bulk bag machine and the leveling roller; B , Disintegration: add 6% NaOH, 0.7% Na 2 Sio 2 , 0.3% industrial soap and 0.06% H 2 o 2 , and then add white water at 80°C, so that the concentration of the disintegration zone is 22%, the temperature is 60°C, and the pH value is 10.5, and the waste paper raw material is gently pulped to obtain a slurry; C. Screening and purification: the slurry is firstly used Two-stage high-concentration slag remover for impurity removal, and then through a first-stage two-stage coarse s...

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Abstract

The invention relates to the technical field of papermaking raw material processing, in particular to a process for preparing recovered pulp with high whiteness and high cleanliness in a papermaking industry. The process comprises the following steps of: selecting and feeding of waste paper raw materials; disintegration; screening purification; first flotation deinking; first concentrated heat dispersion; second flotation deinking; second concentrated heat dispersion; oxidation bleaching; reduction bleaching; and storage in a storage tower. According to the process, 20-30 percent of high-quality office waste paper and 70-80 percent of other low-quality waste paper raw materials are matched, so that the cost of the waste paper raw materials is effectively reduced, and the corporate profit is increased. An advanced rotary drum pulper, a pulping machine and a production line of office waste paper screening purification, flotation deinking, concentrated heat dispersion and pulp bleaching are introduced, and the recovered pulp is prepared through the efficient use of chemicals and an effective production control process. The whiteness of the recovered secondary pulp achieves 90 percent ISO, and the cleanliness is high. The whiteness and the cleanliness of finished culture paper are increased.

Description

technical field [0001] The invention relates to the technical field of papermaking raw material processing, in particular to a preparation process for recycled pulp with high whiteness and high cleanliness in the papermaking industry. Background technique [0002] Cultural paper refers to the writing and printing paper used to spread cultural knowledge, which is called to distinguish it from other daily papers. Mainly include: coated paper, writing paper, offset paper, light coated paper and newsprint, etc. At present, due to the limitations of technology and equipment, the waste paper pulp used for making cultural paper in China is mainly high-quality office waste paper, such as US waste 37#, such waste paper It has the characteristics of less solid impurities and high whiteness, and can realize the whiteness and cleanliness of the prepared slurry, so the purchase standard is high. However, with the shortage and high price of high-quality waste paper raw materials, the c...

Claims

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Application Information

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IPC IPC(8): D21C5/02D21C9/147
CPCY02W30/64
Inventor 刘名中林新阳明星邵珠明刘祥星
Owner DONGGUAN NINE DRAGONS PAPER IND
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