Wood chip extrusion method and equipment for chemimechanical pulping

A technology of chemical mechanical and extrusion methods, applied in the field of chemical mechanical pulping, which can solve the problems of uneven extrusion, large hardness differences, and poor uniformity of wood chips, so as to reduce ineffective consumption, stable operation, and good extrusion effect Effect

Active Publication Date: 2012-06-13
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the extrusion process that often occurs in extruding wood chips with a cantilever single-screw extruder when the existing chemical-mechanical pulp production line uses various commercial air-dried wood chips with poor uniformity and large hardness differences as raw materials for chemical-mechanical pulp production. The pressing screw is "locked", uneven wood chip extrusion, poor effect and other serious defects. A wood chip extrusion method and equipment used in chemical mechanical pulping are provided to improve the extrusion stability of wood chips and improve the extrusion effect. technology to improve the drug absorption performance of the subsequent chemical impregnation section of wood chips, reduce power consumption for refining, improve pulp quality and improve the stability of chemical-mechanical pulp production

Method used

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  • Wood chip extrusion method and equipment for chemimechanical pulping
  • Wood chip extrusion method and equipment for chemimechanical pulping

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Embodiment 1

[0029] Commercial eucalyptus wood chips are first screened to remove oversized wood chips and wood chips; the screened wood chips are washed to remove heavy impurities such as metal and sediment; after washing, the wood chips are soaked for 10 hours to remove free water in the wood chips, and then heated at 100~105 °C Pre-steaming under normal pressure for 15 minutes, so that the raw material lignin is initially softened, and the damage to the fiber caused by screw extrusion is reduced; the steamed wood chips are then respectively set in the axial direction with a compression ratio of 2.8:1, 4 : 1, 6: 1 (volume ratio), extruded by a non-cantilever twin-screw extruder with 3 press zones, so that the wood chips are subjected to gradually increasing extrusion along the spiral axis, and the two press zones are equipped with The water washing device washes the extruded wood chips, and the extruded wood chips are sent to the impregnator for chemical pretreatment. After extrusion, th...

Embodiment 2

[0031] Commercial Chinese fir chips are first screened to remove oversized wood chips and sawdust; the screened wood chips are washed with water to remove heavy impurities such as metal and sediment; after washing, the wood chips are soaked for 12 hours, dehydrated to remove free water in the wood chips, and then heated at 100~105oC Pre-steaming under normal pressure for 20 minutes, so that the raw material lignin is initially softened, and the damage to the fiber caused by screw extrusion is reduced; the steamed wood chips are then respectively set in the axial direction with a compression ratio of 2.8:1, 4 : 1, 6: 1 (volume ratio), extruded by a non-cantilever twin-screw extruder with 3 press zones, so that the wood chips are subjected to gradually increasing extrusion along the spiral axis, and the two press zones are equipped with The water washing device washes the extruded wood chips, and the extruded wood chips are sent to the impregnator for chemical pretreatment. Afte...

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Abstract

The invention relates to a novel wood chip extrusion method for chemimechanical pulping. The method is characterized in that a wood chip is extruded by a multi-pressure area double helix extruder of which the axial compression ratio increases step by step; and a washing device is arranged between two pressure areas, so as to provide convenience for removing extractive of the raw material of the wood chip, ensure that the wood chip is structurally compressed and deformed uniformly, improve the extrusion effect of the wood chip, and reduce invalid consumption of chemicals caused by the extractive of the raw material during the follow-up pulping process. The invention has the advantages that the extrusion effect of the wood chip, the liquid medicine absorbability of the wood chip, and the operation stability of the wood chip extrusion member in CTMP (chemithermomechanical pulp) production are improved; invalid consumption of chemicals caused by the extractive of the raw material can be reduced; and the reduction of pulping power consumption and improvement on pulp quality are facilitated.

Description

technical field [0001] The invention belongs to the technical field of chemical mechanical pulping, in particular to a novel extrusion method of wood chips in chemical mechanical pulping. Background technique [0002] Chemimechanical pulping technology is a new type of pulping technology developed in the late 1980s. It has been rapidly promoted in North America, Northern Europe and other countries and regions. With the application of new papermaking machinery and wet end chemistry, chemical mechanical pulp The application of it has been greatly promoted, and it has been able to be applied to the manufacture of multi-layer cardboard, household paper, coated or uncoated printing, writing paper and other special papers such as release paper, carbonless paper, industrial filter paper, etc. . In addition, through modification, chemical mechanical pulp can also be used in the production of environmentally friendly functional new materials such as high adsorption, packaging shock ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/30D21H11/02
Inventor 邓拥军房桂干丁来保盘爱享韩善明焦健李红斌梁芳敏施英乔沈葵忠李萍
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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