Poplar ASGW pulping process

A process and pulping technology, applied in the direction of inorganic alkali pulping, pulp bleaching, cellulose pulp post-treatment, etc., can solve the problems of high fiber bundle content, poor pulp quality, papermaking and paper quality adverse effects, etc. Achieve the effects of high pulp yield, low cost, and reduced pulping pollution load

Active Publication Date: 2009-12-09
YUEYANG FOREST & PAPER CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Ordinary mechanical grinding stone groundwood pulp (SGW) generally uses coniferous wood (such as pine) for pulping. After the log is ground by a wood grinder, it is pulped at one time, and the quality of the pulp is poor, such as: whiteness after bleaching ≤ 60% ISO, breaking length ≤ 2.0Km, high fiber bundle content, and pine wood contains resin, which will have adverse effects on papermaking and paper quality. SGW pulp is only suitable for low-grade newsprint, not for high-grade culture paper copy

Method used

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Examples

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Embodiment Construction

[0007] Put the stripped Italian poplar sections with a length of 560mm into the ordinary chain-type grinding stone grinder, add 15Kg of sodium hydroxide chemicals with a concentration of 40g / L to the grinder, and grind the poplar into coarse After the slurry is screened by vibrating screen, disk refiner, and CX sieve, the coarse residue of CX sieve is then fed into the disk refiner. Add 22Kg of sodium hydroxide with a concentration of 30g / L and 4Kg of hydrogen peroxide with a concentration of 300g / L at the entrance of the screened slurry. , and pass through appropriate steam, under the process conditions of refining concentration 3.2%, refining temperature 80 ℃, refining pressure 0.5-1.0Mpa, through the φ600mm disc refiner refining treatment, the knocking after refining The density is 50°SR. After the pulp is screened, concentrated, and then bleached with hydrogen oxide, the characteristics of the prepared poplar groundwood pulp pulp are: the breaking length is 2.0Km, and the t...

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Abstract

The invention discloses an Italian poplar ASGW pulping process. The main features are: ① sawing and peeling the logs; ② rough grinding with alkali on the millstone grinder; ③ fine grinding with alkali and hydrogen peroxide on the disc mill; ④ screening, purification and bleaching; the main parameters are: wood section 560± 10mm; coarse grinding sodium hydroxide dosage 1.0-2.0% (for absolute dry pulp); fine grinding sodium hydroxide dosage 1.5-2.5% (for absolute dry pulp); H2O2 dosage 0.2-0.6% (for absolute dry pulp). Its quality characteristics are: breaking length ≥ 2.0Km, tear index ≥ 3.0Mn.m2 / g, percussion degree ≥ 65°SR, wet weight ≥ 2.6g, whiteness before bleaching / whiteness after bleaching 50-55% / 70 - 75% (ISO).

Description

1. Technical field: [0001] The invention relates to a poplar wood ASGW pulping process. 2. Background technology: [0002] Ordinary mechanical grinding stone groundwood pulp (SGW) generally uses coniferous wood (such as pine) for pulping. After the log is ground by a wood grinder, it is pulped at one time, and the quality of the pulp is poor, such as: whiteness after bleaching ≤ 60% ISO, breaking length ≤ 2.0Km, high fiber bundle content, and pine wood contains resin, which will have adverse effects on papermaking and paper quality. SGW pulp is only suitable for low-grade newsprint, not for high-grade culture Paper copy. [0003] The Italian poplar ASGW pulping process is developed by combining the pine SGW pulping and poplar APMP pulping process. Its notable feature is that the pine wood is ground into pulp by a grinding stone grinder at one time, and the poplar is first ground by a grinding stone. Coarse grinding by wood machine, then fine grinding by disc refiner, addin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/02D21B1/02D21B1/28D21B1/16D21D1/30D21C3/02D21C9/00D21C9/16
Inventor 刘曙光尹超谈忠范双喜朱绪斌刘成良肖友年周金涛彭伏龙
Owner YUEYANG FOREST & PAPER CO LTD
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