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

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 ...

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