Double-screw fiberizer with tooth-shape disc

Abstract

The present invention relates to one kind of double screw pulp grinder with toothed disc. The double screw pulp grinder features that inside the mutually buckled upper casing and lower casing, two parallel meshed screws with equal thread inner and outer diameter are mounted and made to rotate in the same direction and constitute one combined structure together with the toothed disc. The width of the inclined slot of the toothed disc is reduced gradually from the material inlet to the outlet, and the screws and the toothed disc are assembled onto the spline shaft with the splines. The present invention is used in producing paper pulp through extruding and shearing plant fiber between two rotating screws and has the features of great fiber length and high brooming effect of paper pulp, low power consumption, low water consumption and less exhaust.

Description

[0001] Field [0002] The invention relates to a refiner for producing pulp for papermaking with plant fiber raw materials, in particular to a twin-screw refiner with toothed discs. Background technique [0003] At present, the production of pulp for papermaking from plant fiber raw materials usually adopts mechanical treatment, chemical treatment or a combination of both. Due to the unique characteristics of mechanical pulping, which can meet special pulping requirements, it cannot be replaced by other pulping methods, so mechanical pulping is a main production method. At present, mechanical pulping generally adopts a stone grinder or a disc refiner. The principle is to separate the fiber after grinding the plant fiber raw material under a certain pressure. The mechanical pulp made by disc refiner has higher fiber content, and its performance is better than that of stone grinder. However, during the refining process of the disc refiner, the fibers are subjected to a large c...

AI Technical Summary

Problems solved by technology

However, during the refining process of the disc refiner, the fibers are subjected to a large cutting and chopping effect, which destroys the fiber structure, reduces the strength, and the knife teeth are easy to wear and affect the refining quality.

In addition, the energy consumption of the disc mill is relatively large, and the operation and maintenance costs are relatively high

[0004] The latest twin-screw refiner was patented by the applicant at the end of 2003 (named "co-rotating twin-screw refiner"). The twin-screw refiner uses reverse spirals for reverse extrusion cutting The disadvantage is that the structure is more complicated, the manufacture is difficult, and the cost is higher

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