Production method of chemi-mechanical pulp

Abstract

The invention provides a production method of chemi-mechanical pulp, which comprises the following steps: first pulping pulpwood and defibering and bleaching, thus obtaining defibered pulp; and then screening and thickening the defibered pulp, and conducting secondary thick grinding, thus obtaining single-fiberized chemi-mechanical pulp and directly delivering the single-fiber chemi-mechanical pulp to a papermaking shop. The production method of chemi-mechanical pulp reduces lumps in the pulp, effectively reduces power consumption during secondary thick grinding, reduces abrasion of a mill stone and improves the service life thereof, also obviously improves the pulping effect of the pulp, and leads to high single-fiberization rate and higher pulping degree of the pulp; and an adjusting tower is adopted in the production method for storing and thickening the pulp, and simultaneously the pulp can be further leached, therefore, the concentration of the pulp can be better controlled and can be even in the process, thus facilitating the follow-up working procedures.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for producing chemical-mechanical pulp. Background technique [0002] Pulping and papermaking is one of the important industries of my country's national economy. Since 1992, the output and consumption of paper and cardboard produced in my country have ranked among the top three in the world. The manufacture of chemical-mechanical pulp is an important process of papermaking. At present, the production of chemical-mechanical pulp generally uses a roller refiner to refine wood chips and other raw materials, and at the same time adds bleaching agent for bleaching; then the obtained pulp is sent to The medium-consistency disc refiner is used for medium-consistency grinding, or sent to the high-consistency disc refiner for high-consistency grinding; finally, the obtained slurry with high beating degree is directly sent to the papermaking workshop. This method is simple, ...

AI Technical Summary

Problems solved by technology

This method is simple, but the pulp raw materials that have been rolled by roller mills have many block structures, and they are directly subjected to medium-consistency grinding or high-consistency grinding. , the problem of short service life, at the same time, the single fiberization rate of the slurry obtained after medium-consistency grinding or high-consistency grinding is also low, and its beating degree is often difficult to meet the design requirements

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