Pulping process of waste paper deinking pulp for furnishing high-grade printing paper

A technology for deinking pulp and printing paper of waste paper, which is applied in processing waste paper, pulp bleaching, papermaking, etc. It can solve the problems that the degree of control of stickies cannot reach high-grade paper products, reduce the operating performance of paper machines and product quality, etc. , to achieve the effect of reducing the consumption of forest resources, protecting the environment and saving resources

Inactive Publication Date: 2013-04-24
福建省晋江优兰发纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At the same time, the lipophilic colloidal substances dispersed in the process water or pulp water system and the non-cellulose substances dissolved in water during the bleaching process of waste paper pulping are called stickies, and the accumulation of these stickies will reduce the efficiency of the paper machine. Therefore, the treatment of stickies is also

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 35% #37 office waste paper, 45% #8 old newspaper, 20% #10 old magazine paper 1500 kg of waste paper are sorted and sent to the high consistency hydraulic pulper through the chain conveyor, after pulping, High-concentration sand removal, coarse screening, medium-concentration sand removal, fine screening, flotation, concentration, heat dispersion, bleaching, backwater and sticky matter treatment, the waste paper can be deinked pulp after the above processes.

[0035] The pulping process is as follows: the waste paper and water are placed in a high-consistency hydraulic pulper, and 1.8% of deinking agent and 0.1% of compound biological enzyme are added to the high-consistency hydraulic pulper relative to the dry weight of waste paper. and 1.0% surfactant, the deinking agent is a combination of sodium dodecylbenzenesulfonate and sodium dodecyl sulfate; the compound biological enzyme is composed of 50% cellulase and 50% lipase; surface activity The non-ionic surfactant is a...

Embodiment 2

[0048] 65% #37 office waste paper, 5% #8 old newspaper, 30% #10 old magazine paper 1500 kg of waste paper are sorted and sent to the high consistency hydraulic pulper through the chain conveyor, after pulping, High-concentration sand removal, coarse screening, medium-concentration sand removal, fine screening, flotation, concentration, heat dispersion, bleaching, backwater and sticky matter treatment, the waste paper can be deinked pulp after the above processes.

[0049] The pulping process is as follows: waste paper and water are placed in a high-consistency hydraulic pulper, and 0.1% of deinking agent and 0.8% of compound biological enzyme are added to the high-consistency hydraulic pulper relative to the dry weight of waste paper. and 2% surfactant, the deinking agent is a combination of sorbitan methyl stearate and polyoxyethylene sorbitan methyl stearate; the compound biological enzyme is composed of 50% cellulase and 50% The composition of lipase; the surfactant is an a...

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Abstract

The invention relates to the technical field of pulping and papermaking, and particularly relates to a pulping process of waste paper deinking pulp for furnishing high-grade printing paper. The pulping process comprises the following procedures of: repulping, high-concentration desanding, coarse screening, middle-concentration desanding, fine screening, floatation, concentration, heat dispersion, decoloration, backwater and gooey treatment, wherein the repulping procedure comprises the following steps of: placing waste paper and water into a high-concentration hydrapulper; adding 0.1%-1.8% by weight of deinking agents, 0.1%-0.8% by weight of compound biological enzymes and 0.1%-2.0% by weight of surface active agents relative to the bone dry weight of waste paper into the high-concentration hydrapulper; controlling the repulping concentration at 10-20%, the temperature at 50-60 DEG C and the repulping time at 10-30 minutes, and keeping the temperature for 0-20 minutes to obtain broken deinking pulp. The waste paper deinking pulp prepared through the pulping process disclosed by the invention has the advantages of high whiteness, high gooey removal ratio, high dust removal ratio and high ERIC (Entire Combined Ink Content) removal ratio and meets the requirement of the high-grade printing paper.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a pulping process for preparing waste paper deinked pulp for high-grade printing paper. Background technique [0002] Waste paper has become an important source of the paper industry, and its proportion is increasing. The recycling of waste paper is an effective way to solve the three major problems faced by the paper industry, such as shortage of raw materials, energy shortage and serious pollution. The premise of expanding the recycling of waste paper raw materials is to expand the utilization field of waste paper pulp, and deinking is the key to waste paper recycling technology. [0003] At present, the methods used for waste paper deinking mainly include alkaline chemical deinking and enzymatic deinking. The traditional alkaline chemical deinking needs to add a lot of chemicals, which will cause an increase in the pollution load of deinking wastewater, low pu...

Claims

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Application Information

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IPC IPC(8): D21C5/02D21B1/32D21B1/34D21C9/16
CPCY02W30/64
Inventor 柯吉熊曹旭
Owner 福建省晋江优兰发纸业有限公司
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