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

A hardwood, 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 effects of short processing time, simple process equipment and small dosage.

Inactive Publication Date: 2003-02-19
SOUTH CHINA UNIV OF TECH +1
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • 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

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
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] Take the raw material of Eucalyptus Leylin No. 1 as an example:

[0023] ——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):

[0024] Caustic soda 5%

[0025] Sodium 6%

[0026] JFC penetrant 0.1%, stirred at 80°C for 2 hours;

[0027] ——High temperature and high pressure treatment: put the pretreated material into the blasting tank, and treat it at 210°C and 2.20mpa pressure for 8 minutes;

[0028] ——Spraying: the raw material is blasted and sprayed into the receiving container instantly;

[0029] - 2 stage refining;

[0030] ——Beating to 55°SR.

[0031] 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.

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
Login to view more

PUM

No PUM Login to view more

Abstract

A low-and medium-pressure blasting method for pulping the broad-leaf wood includes proportioning the alkali (1-6 wt%), Na-S compound (1-16 wt%), assistant (0-1 wt%) and broad-leaf wood (rest), stirring at ordinary temp -90 deg.C for 0-24 hr, treating at 140-220 deg.C and 0.8-2.28 MPa for 3-15 min, and sudden blasting. Its advantages are high strength, output rate, whiteness, toughness and rinsability, and low energy consumption.

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

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
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap