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Preparation method of self-bonding bark board with three-layered structure

A three-layer structure, bark technology, applied in the direction of wood layered products, wood veneer bonding, chemical instruments and methods, etc., can solve the problem of low static bending strength, long hot pressing time, The problem of high temperature of hot pressing forming can achieve the effect of high strength, improved static bending strength and good heat resistance

Inactive Publication Date: 2012-04-18
NORTHEAST FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problems of low static bending strength, high hot-pressing temperature and long hot-pressing time of the glue-free glued bark board prepared by the existing method, and to provide a three-layer structure glue-free Preparation method of glued bark board

Method used

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  • Preparation method of self-bonding bark board with three-layered structure
  • Preparation method of self-bonding bark board with three-layered structure
  • Preparation method of self-bonding bark board with three-layered structure

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specific Embodiment approach 1

[0008] Specific embodiment one: the preparation method of the three-layer structure glue-free glued bark board in the present embodiment is as follows: Step 1, bark thermal grinding activation: add the bark with moisture content 35%~75% in the thermal grinding machine, Then heat grinding at a temperature of 130°C to 195°C, a pressure of 0.1MPa to 1.3MPa, a grinding disc gap of 0.08 mm to 1.1 mm, and a grinding disc speed of 1000 rpm to 2400 rpm. 0.5 minute~6 minutes, obtain the mixture of bark fiber and bark powder, then dry the mixture of bark fiber and bark powder to moisture content 3.5%~12%; 40% to 90% of coniferous wood chips are added to the thermal grinder, and then heated at a temperature of 130°C to 195°C, a pressure of 0.1MPa to 1.3MPa, and a gap between the grinding discs of the thermal grinder of 0.08mm to 1.1mm. Heat grinding for 1 to 5 minutes under the condition of rotating speed of 1000 rpm to 2400 rpm to obtain coniferous wood fiber, and then dry the coniferou...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, the bark with a moisture content of 35% to 75% is activated by heat grinding at a temperature of 140° C. to 192° C. Others are the same as in the first embodiment.

[0012] The glueless glued bark board density of present embodiment gained is 900kg / m 3 ~1100kg / m 3 , the internal bonding strength is 1.09MPa ~ 1.85MPa, and the static bending strength is 10.50MPa ~ 20.40MPa.

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the bark with a moisture content of 35% to 75% is activated by thermal grinding under the condition of a pressure of 0.3 MPa to 1.2 MPa. Others are the same as in the first or second embodiment.

[0014] The glueless glued bark board density of present embodiment gained is 900kg / m 3 ~1100kg / m 3 , the internal bonding strength is 1.09MPa ~ 1.85MPa, and the static bending strength is 10.50MPa ~ 20.40MPa.

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Abstract

The invention relates to a preparation method of a self-bonding bark board with a three-layered structure, in particular to a preparation method of a bark board. The invention solves the problems of low static bending strength, high hot-press forming temperature and long hot-press time existing in a self-bonding bark board prepared by the prior method. The preparation method comprises the following steps: firstly, hot grinding and activating a bark; secondly, hot grinding wood fiber; thirdly, paving a board blank; and fourthly, hot-press forming to obtain the self-bonding bark board with the three-layered structure. The density of the self-bonding bark board with the three-layered structure obtained by adopting the method is 9000-1100 kg / m3, the internal bonding strength is 1.09-1.85 MPa,and the static bending strength is 10.50-20.40 MPa.

Description

technical field [0001] The invention relates to a preparation method of a bark board. Background technique [0002] Chow disclosed a glueless glued bark board in 1975 (Chow S. Bark board without synthetic resins. Forest Products Journal, 1975, Vol.25, No.11: 32-37), but he used Bark powder (the bark powder passes through a 5-mesh sieve) to prepare the bark board, hot-pressed at 300°C for 5 minutes or 280°C for 20 minutes to prepare a free board with an internal bonding strength of 1.38MPa (200PSI). Glue the bark board, but the static bending strength of the bark board is very low, and its static bending strength is 13.1MPa (1900PSI). Troughton mentioned a kind of glue-free glued bark board (Troughton G.E., Chan K.L., Love K.G.Manufactureofhog fuel board.US Patent 5725818) that adopts bark scraps to prepare in his firewood board preparation patent, and its static bending strength is also Very low, the static bending strength of the bark board obtained by hot pressing at 300...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27D1/08B32B21/13
Inventor 高振华王向明万辉吉尔斯·布鲁特尼
Owner NORTHEAST FORESTRY UNIVERSITY