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Middle-or low-pressure explosion method for making pulp with broad-leaf wood

A broad-leaved wood, low-pressure technology, applied in the field of papermaking, can solve the problems of high paper brittleness, deep color of blasting pulp, poor bleachability, etc., and achieve the effect of short processing time, simple process equipment and small dosage

Inactive Publication Date: 2005-05-11
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

For example, the high-pressure blasting method, due to improper control of blasting pressure, pretreatment dosage, temperature and other process conditions, the blasting pulp developed has a darker color, poor bleachability, and high paper brittleness, so the blasting pulp currently produced can only be used for production. Building board, fiberboard, or very low-grade paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] Take the raw material of Eucalyptus Leylin No. 1 as an example:

[0031] ——Raw material pretreatment: Add the following dosage of drugs to the raw materials (the dosage of drugs is calculated relative to the absolute dry weight of raw materials):

[0032] Caustic soda 5%

[0033] Sodium 6%

[0034] JFC Penetrant 0.1%

[0035] Stirring at 80°C for 2 hours;

[0036] ——Middle and low pressure treatment: put the pretreated material into the blasting tank, and treat it at 210°C and 2.20mpa pressure for 8 minutes;

[0037] ——Spraying: the raw material is blasted and sprayed into the receiving container instantly;

[0038] - 2 stage refining;

[0039] ——Beating to 55°SR.

[0040] The pulp whiteness is 50%, the yield is 83%, the breaking length is 6800M, and the tearing index is 6.35mN.m 2 / g, burst index 2.58kPa.m 2 / g.

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PUM

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Abstract

A kind of pulping method of medium and low pressure blasting method for hardwood, comprising: raw material pretreatment: adding the following dosage of medicine to the hardwood raw material (the dosage of medicine is calculated relative to the dry weight of raw material): 1-6% of alkali, sodium-sulfur compound 1-16%, 0-1% additives, stirring at room temperature -90°C for 0-24 hours; high temperature and high pressure treatment: put the pretreated material into a blasting tank, at 140-220°C, 0.8mpa- 2. Treat for 3-15 minutes under the pressure of 28mpa; blowing: the raw material is blasted and sprayed into the receiving container; the invention makes the hardwood blasting pulp maintain high strength, high yield, low energy consumption, and has high whiteness, The advantages of good bleachability and toughness enable hardwood blasting pulp to be used in the manufacture of medium and high-grade paper.

Description

technical field [0001] The invention relates to a pulping technology in the field of papermaking, in particular to a pulping method for hardwood with medium and low pressure blasting. Background technique [0002] Due to the lack of greening and wood raw materials, a large number of fast-growing broad-leaved woods such as eucalyptus and poplar are planted in the south and north of my country. With the development of the western region, more fast-growing hardwoods will be planted in the western region. These woods are currently mainly used for processing plywood, and the leftovers are basically used as fuel. The demand for wood for plywood is also far less than the growth rate of fast-growing wood. Therefore, although my country's timber resources are generally scarce, a large amount of fast-growing timber is in urgent need of development and utilization. [0003] Pulping of hardwood by blasting has become a research hotspot in our country for a time, and various blasting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02
Inventor 胡键黄干强詹怀宇郑炽嵩刘焕彬
Owner SOUTH CHINA UNIV OF TECH
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