Method for preparing eucalyptus and poplar mixture material bleached chemical thermomechanical pulp

Abstract

The invention belongs to the technical field of preparing bleached chemical thermomechanical pulp and in particular relates to a process method for preparing the bleached chemical thermomechanical pulp from eucalyptus and poplar. The process method adopts the eucalyptus and the poplar as raw materials to prepare the bleached chemical thermomechanical pulp; through the addition of a pulp grinding accelerant, the process reduces energy consumption of pulp grinding by 10 to 15 percent compared with the prior process for the bleached chemical thermomechanical pulp, reduces production cost, saves energy and simultaneously reduces the content of pulping fasciculus.

Description

technical field [0001] The invention belongs to the technical field of preparing bleached chemical thermomechanical pulp, in particular to a process method for preparing bleached chemical thermomechanical pulp from eucalyptus and poplar. Background technique [0002] With the increase of domestic paper and cardboard production capacity, the shortage of papermaking raw materials has become increasingly prominent. Wood pulp fiber has to rely on a large amount of imports. The price of raw materials is subject to foreign suppliers, which seriously affects the economic benefits of enterprises and restricts the development of the industry. The fiber yield of traditional chemical pulp production is only 50%-55%, while the bleaching chemical thermomechanical pulping technology can achieve a fiber yield of more than 85%, which is about 70% higher than the traditional chemical pulp wood utilization efficiency. Therefore, the development of bleaching chemical Thermomechanical pulping t...

AI Technical Summary

Problems solved by technology

[0004] At present, the main problem in the actual production of bleached chemical thermomechanical pulping technology is that the energy consumption of pulping is high, which usually accounts for about 1 / 3 of the production cost, which is not conducive to reducing costs and saving energy for enterprises.

[0005] Bleached chemical thermomechanical pulp generally uses poplar as raw material, and poplar is mostly in the northern region, with a long growth cycle and insufficient resources, which cannot meet the large demand for wood raw materials in the paper industry

As the wood grows in the south where the rain is abundant, its growth is fast, the cycle is short, and the resources are abundant, but its material is dark in color and the whiteness of the pulp fiber is low. It is difficult to meet the quality requirements of high-grade paper when it is used alone to prepare pulp

[0006] However, in actual production, due to relatively thin poplar fibers, thin walls, and soft fibers; relatively thick eucalyptus fibers, thick walls, and hard fibers, it is difficult to control the degree of extrusion and loosening during the refining process. The speed also varies greatly, which will lead to a higher content of fiber bundles in the pulp, so it is relatively difficult to prepare bleached chemical thermomechanical pulp by mixing them