Colored kraft paper and production method thereof

A production method and technology for kraft paper, applied in the directions of paper, papermaking, papermaking machines, etc., can solve the problems of backward pulping process, high production cost and high cost of waste paper, reduce the amount of virgin fibers, improve the appearance quality, and reduce the production cost. Effect

Active Publication Date: 2011-11-23
YUEYANG FOREST & PAPER CO LTD +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The scheme disclosed in Chinese Patent Application No. 93109932 uses larch as raw material, adopts hypochlorite bleaching, produces organic chlorides that are not easy to biodegrade during the existence process, and pollutes the environment. The scheme of Chinese Patent Application No. 98106862 uses 100% Russian bleached softwood pulp is used as raw material, which has the disadvantages of high production cost and high dependence on foreign countries; Chinese patent application number 200610047147 proposes a method for producing refined kraft paper using American waste paper, and its waste paper pulping process is very backward and unscientific
Chines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example example １

[0021] Use the mixed waste paper raw materials of 10# waste paper with an absolute dry mass ratio of 30%, 30% coated paper, 20% 8# waste paper and 20% 37# waste paper, after shredding, screening and purification, washing and flotation , dehydration concentration, thermal dispersion, bleaching and other processes to produce deinked pulp for waste paper. The key process parameters of each process are: ① Disintegration conditions: concentration 18%, temperature 50°C, sodium silicate addition (%) 0.8%, NaOH addition (%) 0.5%, Soap addition (%) 0.5%, H 2 o 2 Addition amount (%) 0.5%; ② Screening and purification, pre-finishing sieve concentration 3.0%, pressure 280kPa; ③ Washing or flotation, flotation concentration before three stages are 1.0%, 1.0% and 1.15%, temperature 45℃, pH 9.0; ④ Dehydration and concentration, multi-disk concentration, the inlet concentration is 0.78%, the outlet concentration is 11%, the screw extruder inlet concentration is 10%, the outlet concentration ...

Embodiment ２

[0024] Using a mixed waste paper raw material of 25% dry mass ratio of 10# waste paper, 40% coated paper, 20% of 8# waste paper and 15% of 37# waste paper, after crushing, screening and purification, washing and flotation , dehydration concentration, thermal dispersion, bleaching and other processes to produce deinked pulp for waste paper. The key process parameters of each process are: ① Disintegration conditions: concentration 18%, temperature 50°C, sodium silicate addition (%) 0.8%, NaOH addition (%) 0.5%, Soap addition (%) 0.5%, H 2 o 2 Addition amount (%) 0.5%; ② Screening and purification, pre-finishing sieve concentration 3.0%, pressure 280kPa; ③ Washing or flotation, flotation concentration before three stages are 1.0%, 1.0% and 1.15%, temperature 45℃, pH 9.0; ④ Dehydration and concentration, multi-disk concentration, the inlet concentration is 0.78%, the outlet concentration is 11%, the screw extruder inlet concentration is 10%, the outlet concentration is 30%; ⑤ hea...

Embodiment 3

[0028] Using the mixed waste paper raw materials of 30% dry mass ratio of 10# waste paper, 35% coated paper, 15% of 8# waste paper and 20% of 37# waste paper, after shredding, screening and purification, washing and flotation , dehydration concentration, thermal dispersion, bleaching and other processes to produce deinked pulp for waste paper. The key process parameters of each process are: ① Disintegration conditions: concentration 18%, temperature 50°C, sodium silicate addition (%) 0.8%, NaOH addition (%) 0.5%, Soap addition (%) 0.5%, H 2 o 2 Addition amount (%) 0.5%; ② Screening and purification, pre-finishing sieve concentration 3.0%, pressure 280kPa; ③ Washing or flotation, flotation concentration before three stages are 1.0%, 1.0% and 1.15%, temperature 45℃, pH 9.0; ④ Dehydration and concentration, multi-disk concentration, the inlet concentration is 0.78%, the outlet concentration is 11%, the screw extruder inlet concentration is 10%, the outlet concentration is 30%; ⑤...

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Abstract

The invention discloses colored kraft paper and a production method thereof. The production method comprises the following steps: pulping waste paper, screening, purifying, floating, concentrating, dewatering, carrying out heat dispersion, and bleaching to obtain waste paper deinked pulp; mixing the waste paper deinked pulp with beaten commercial softwood pulp; and desanding, blending (including color mixing), screening, purifying, carrying out net shaping, squeezing, drying, calendering, winding, rewinding, and packing, wherein the absolute dry mass ratio of the waste paper deinked pulp to the commercial softwood pulp is 70-80%:20-30%. The colored kraft paper produced by the method has high physical strength, low production cost and good tissue evenness, the color of the paper can be adjusted in accordance with user preferences by adding dyes, and the appearance quality is obviously improved; as the used waste paper pulp is subjected to TCF (Total Chlorine Free) bleaching in the pulping process, organic halides (AOX) and dioxin which are difficult to biodegrade can not be produced in the production process, thereby having the advantage of realizing clean production; and 70% of regenerated fibers are used to reduce the consumption of virgin fibers, thereby saving wood and being environment friendly.

Description

technical field [0001] The invention relates to a paper and its production method, in particular to a color kraft paper produced by using waste paper deinked pulp and coniferous wood pulp as fiber raw materials and its production method. Background technique [0002] Colored kraft paper is special paper. In addition to the high strength, good appearance quality and certain printing performance of high-quality kraft paper and ordinary kraft paper to meet the needs of the growing paper packaging industry, it also needs specific colors to meet customers' pursuit of beauty. . The research literature on kraft paper that has appeared in recent years is as follows: [0003] Chinese patent application No. 931009932 discloses a process for manufacturing refined kraft paper, including the preceding process consisting of peeling, chipping, cooking, washing and slag removal, followed by beating, netting, pressing, light pressing, drying, calendering, and curling. And the subsequent pr...

Claims

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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Application Information

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IPC IPC(8): D21F11/00D21B1/32D21B1/36D21C9/16D21C9/10D21H17/32D21H21/18D21H21/28
CPCY02W30/64
Inventor 陈金山邵启超尹超李庆秋谈忠朱宏伟周金涛刘春景
Owner YUEYANG FOREST & PAPER CO LTD
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