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Artificial board fiber separation process capable of prolonging service lives of abrasive discs

A fiber separation and wood-based panel technology, which is applied in fiber raw material processing, papermaking, textiles and papermaking, etc., can solve the problems of short service life and large loss of grinding discs, and achieve extended service life, cost savings, and reduced frequency and downtime. Effect

Inactive Publication Date: 2012-10-03
DAYA WOOD IND JIANGXI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problem of short service life and high loss of grinding discs in the prior art, and proposes a fiber separation process that prolongs the service life of grinding discs and improves the production efficiency of continuous work in the production line

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of wood chips: After peeling different proportions of wood, cut wood chips with a length of 15-20mm, a width of 15-20mm, and a thickness of 3-4mm. Wash with water to remove impurities such as sand, stones and other sundries to ensure the cleanliness of wood chips;

[0019] Fiber grinding process: through pre-cooking at about 90°C, the cooking temperature is about 165-175°C, the cooking time is 2-4.5min, and the cooking pressure is 0.7-0.85Mpa to fully soften the wood chips; when the pressure of the grinding chamber is increased by 0.03 Under the condition of Mpa, the wood chips enter the mill through the belt screw, the gap between the grinding discs is between 0.4-0.55mm, and the fiber separation is carried out in the grinding area of ​​the mill running at high speed.

Embodiment 2

[0021] Preparation of wood chips: After peeling different proportions of wood, cut wood chips with a length of 15-20mm, a width of 15-20mm, and a thickness of 3-4mm. Wash with water to remove impurities such as sand, stones and other sundries to ensure the cleanliness of wood chips;

[0022] Fiber grinding process: through pre-cooking at about 90°C, the cooking temperature is about 165-175°C, the cooking time is 2-4.5min, and the cooking pressure is 0.7-0.85Mpa to fully soften the wood chips; when the pressure of the grinding chamber is higher than the pressure of the cooking cylinder 0.06 Under the condition of Mpa, the wood chips enter the mill through the belt screw, the gap between the grinding discs is between 0.4-0.55mm, and the fiber separation is carried out in the grinding area of ​​the mill running at high speed.

Embodiment 3

[0024] Preparation of wood chips: After peeling different proportions of wood, cut wood chips with a length of 15-20mm, a width of 15-20mm, and a thickness of 3-4mm. Wash with water to remove impurities such as sand, stones and other sundries to ensure the cleanliness of wood chips;

[0025] Fiber grinding process: through pre-cooking at about 90°C, the cooking temperature is about 165-175°C, the cooking time is 2-4.5min, and the cooking pressure is 0.7-0.85Mpa to fully soften the wood chips; when the pressure of the grinding chamber is higher than the pressure of the cooking cylinder 0.09 Under the condition of Mpa, the wood chips enter the mill through the belt screw, the gap between the grinding discs is between 0.4-0.55mm, and the fiber separation is carried out in the grinding area of ​​the mill running at high speed.

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Abstract

An artificial board fiber separation process capable of prolonging service lives of abrasive discs includes a wood chip preprocess step, a wood chip preboiling step, a wood chip boiling step and a fiber separation step. In the fiber separation step, the pressure of a grinding compartment is increased by 0.03-0.09MPa on the basis of the boiling pressure which ranges from 0.70MPa to 0.85MPa, and the clearance between the abrasive discs ranges from 0.4mmm to 0.55mmm. During production of high-density fiber boards, a negative pressure difference process that the pressure of the grinding compartment is smaller than the boiling pressure is utilized generally for fiber separation, and the clearance between a moving abrasive disc and a fixed abrasive disc ranges from 0.3mm to 0.45mm. In the artificial board fiber separation process, the pressure of the grinding compartment is higher than the pressure of a boiling cylinder by 0.03-0.09MPa, the clearance between the moving abrasive disc and the fixed abrasive disc is increased by 0.05-0.1mm, and the yield of a grinding machine is controlled to be 30-40t / h. Due to high pressure of the grinding compartment, resistance to the wood chips passing through a grinding area is increased, resistance time is prolonged, mutual extruding friction and rubbing of the wood chips within the grinding area are enhanced, and then fiber separation effect is strengthened, while self abrasion of the abrasive discs used for directly cutting the wood chips is lowered. Besides, as the clearance between the abrasive discs is increased, mutual friction and collision can be reduced, and the service lives of the abrasive discs are prolonged.

Description

technical field [0001] The invention belongs to the technical field of wood-based panel production, and in particular relates to the thermal grinding process in the production process of medium and high-density fiberboards. Background technique [0002] Medium- and high-density fiberboards are man-made panels made of wood and adhesives through processes such as fiber separation, sizing, drying, paving, hot pressing, and post-processing. They are widely used in furniture manufacturing, interior decoration, construction, vehicles and ships. , home appliances and other industries. The thermal grinder used for fiber separation is one of the key equipment in the wood-based panel production line. The grinding plate is easy to wear and has a large loss during the process of separating fibers. Generally, in the production line with an annual output of 200,000 cubic meters, the moving grinding plate and the fixed grinding plate The grinding discs need to be replaced at the same time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21D1/20D21B1/02D21C7/00
Inventor 吴建华钱广圣张凤生
Owner DAYA WOOD IND JIANGXI
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