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A Method for Reducing Residual Ink in Color Laser Coated Plate Waste Paper Deinking Pulp

A waste paper deinking pulp, color laser technology, which is applied in the processing of waste paper, pulp bleaching, cellulose pulp post-processing, etc. Small size effect

Active Publication Date: 2017-11-14
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other papers, color laser inks are mainly composed of toner, thermoplastic polymers and various dyes, which are difficult to remove effectively in the conventional deinking process, and the residual ink seriously reduces the product quality of the deinked pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Conventional color laser copperplate waste paper is used to produce deinked pulp, and the waste paper is subjected to hydropulping treatment. The treatment conditions are: NaOH dosage 1.0%, NaOH 2 SiO 3 Dosage 2.4%, H 2 o 2 The dosage is 1.3%, the dosage of deinking agent is 0.5%, the treatment time is 26min, the pulp concentration is 9.0%, and the dispersion speed is 1500rpm. After pulping, enter the deinking section. The deinking conditions are: deinking agent dosage 0.4%, pulp concentration 1.0%, deinking time 16min, flotation deinking. After deinking, wash the slurry and carry out bleaching treatment. The bleaching process conditions are: NaOH consumption 1.2%, NaOH 2 SiO 3 Dosage 2.6%, EDTA dosage 0.25%, MgSO 4 Dosage 0.05%, H 2 o 2 The dosage is 2.34%, the temperature is 70°C, and the bleaching time is 2h. The performance indicators of the prepared deinked pulp are: whiteness 78.4% ISO, residual ink content 823.6ppm, bulk thickness 2.02cm 3 g -1 , Burst ...

Embodiment 2

[0021] Conventional color laser copperplate waste paper is used to produce deinked pulp, and the waste paper is subjected to hydropulping treatment. The treatment conditions are: NaOH dosage 1.1%, NaOH 2 SiO 3 Dosage 2.3%, H 2 o 2The dosage is 1.3%, the dosage of deinking agent is 0.4%, the treatment time is 22min, the pulp concentration is 9.8%, and the dispersion speed is 1400rpm. After pulping, enter the deinking section. The deinking conditions are: deinking agent dosage 0.52%, pulp concentration 1.1%, deinking time 25min, flotation deinking. After deinking, wash the slurry and carry out bleaching treatment. The bleaching process conditions are: NaOH dosage 1.15%, NaOH 2 SiO 3 Dosage 2.5%, EDTA dosage 0.2%, MgSO 4 Dosage 0.05%, H 2 o 2 The dosage is 2.4%, the temperature is 70°C, and the bleaching time is 2.2h. The performance indicators of the prepared deinked pulp are: whiteness 79.1% ISO, residual ink amount 817.2ppm, bulk thickness 2.07cm 3 g -1 , burst index...

Embodiment 3

[0024] Conventional color laser copperplate waste paper is used to produce deinked pulp, and the waste paper is subjected to hydropulping treatment. The treatment conditions are: NaOH dosage 1.5%, NaOH 2 SiO 3 Dosage 2.6%, H 2 o 2 The dosage is 1.4%, the dosage of deinking agent is 0.3%, the treatment time is 24min, the pulp concentration is 10.2%, and the dispersion speed is 1500rpm. After pulping, enter the deinking section. The deinking conditions are: deinking agent dosage 0.44%, pulp concentration 1.0%, deinking time 20min, flotation deinking. After deinking, wash the slurry and carry out bleaching treatment. The bleaching process conditions are: NaOH consumption 1.25%, NaOH 2 SiO 3 Dosage 2.5%, EDTA dosage 0.3%, MgSO 4 Dosage 0.05%, H 2 o 2 The dosage is 2.3%, the temperature is 70°C, and the bleaching time is 2.25h. The performance indicators of the prepared deinked pulp are: whiteness 80.1% ISO, residual ink amount 832.5ppm, bulk thickness 2.02cm 3 g -1 , bur...

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Abstract

The invention relates to a method for reducing deinked pulp residual printing ink on color laser copperplate waste paper. The method is characterized in that 1-ethyl-3-methylimidazolium chloride and LiClO4.3H2O are combined to form a mixed solvent, the mixed solvent is added in the color laser copperplate waste paper, then lipase and lithium hydroxide are added, chemicals and waste paper are uniformly mixed in a medium concentration mixer, the mixed material is heated to the predetermined temperature, then is subjected to ultrasonic treatment to the predetermined time; the processed material is subjected to repulping, washing and ink removing, a washing liquid is introduced into a solvent recovery system, and the recovered solvent is circularly used. The method can effectively swell up the color laser copperplate waste paper fibers, reduces the connection of fiber and printing ink particles, realizes high efficiency removal of the color laser copperplate waste paper printing ink particles, improves the physical intensity and optical performance of the paper, and increases the product quality of deinked pulp, and the employed mixed solvent has the advantages of stable property and easy recovery, and realizes the environmentally friendly processing for the waste paper fiber.

Description

technical field [0001] The invention relates to a method for improving the quality of color laser copperplate waste paper deinking pulp, in particular to a method for improving the quality of deinked pulp by using 1-ethyl-3-methylimidazole acetate and LiClO 4 ·3H 2 O mixed liquid is used as a solvent, and the waste paper raw material is ultrasonically treated under the action of lipase and lithium hydroxide to reduce the residual ink of the color laser copperplate waste paper deinking pulp. Background technique [0002] Waste paper is an important fiber raw material in the pulp and paper industry, also known as secondary fiber (secondary fiber), which refers to the paper that is used as a paper raw material after the base paper is printed by different printing methods and then deinked. Recycling and recycling waste paper is of great significance in terms of economic benefits, social benefits and environmental protection. At present, about 100 million tons of papermaking ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/02D21C9/16
CPCD21C5/025D21C5/027D21C9/163Y02W30/64
Inventor 陈嘉川庞志强杨桂花刘小宁
Owner QILU UNIV OF TECH