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Production method of density distribution controllable solid wood compression compacted board

A density distribution and board production technology, which is applied in the direction of wood processing appliances, wooden veneer joints, manufacturing tools, etc., can solve problems such as the release of harmful substances, and achieve the effect of increasing value, expanding the field of use, and improving quality and performance

Active Publication Date: 2018-12-07
JIUSHENG WOOD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Inoue M, Gabrielli C, Liu Junliang et al. reported that the wood surface was impregnated with chemical polymers such as phenolic resin and melamine resin to compress the wood surface, and the compressed wood with significantly improved surface properties and dimensional stability could be obtained, but due to the release of harmful substances , limiting its promotion and application

Method used

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  • Production method of density distribution controllable solid wood compression compacted board
  • Production method of density distribution controllable solid wood compression compacted board
  • Production method of density distribution controllable solid wood compression compacted board

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1: A method for producing solid wood compression and densification boards with controllable density distribution, adjusting the moisture content of each layer in the thickness direction of the solid wood boards by means of immersion and / or drying, and forming a dry layer in the inner thickness direction of the solid wood boards. The wet area is formed in the high moisture content layer in the thickness direction inside the solid wood board, and the dry-wet interface is formed at the junction of the dry area and the wet area, such as the attached figure 1 shown, with figure 1 It is a schematic diagram of adjusting the moisture content of a solid wood board to form a dry area and a wet area. The abscissa x is the position in the thickness direction of the board, and the ordinate is the moisture content corresponding to the abscissa position. In the figure, area 1 is the dry area, area 2 is the wet area, and the interface between area 1 and area 2 is the dry-wet...

Embodiment 2

[0052] Embodiment 2: The specific manufacturing method of surface layer compression and densification plate:

[0053] Single surface (only one surface) compression process:

[0054] After immersing the sheet with a moisture content below the air-dried moisture content value (below 10%), or floating or wet on the water surface, make the surface moisture content greater than 20%, and then place it on a single-sided pressing plate and heat it to 100-150°C. On the upper part of the press, the water-soaked surface should be on the same side as the heating plate, and continuously compressed at a speed of 2-7mm / min, with a pressure of more than 3MPa, until the compression reaches the target thickness, forming a single-sided compressed wood soaked in water and compressed on the heating surface;

[0055] Upper and lower surface compression process:

[0056] Air-dry wood to absolute dry wood with an initial moisture content of less than 15%: soak in water after sealing or spray water w...

Embodiment 3

[0058] Embodiment 3: The specific manufacturing method of the intermediate layer compression and densification plate:

[0059] After the end (cross section) of the board with a moisture content greater than 15% is coated with materials such as bone glue, paraffin, asphalt, etc. for wood end sealing, it is carried out at a temperature above 100°C by means of contact (hot pressing plate) heat conduction. The clamping and drying treatment for more than 60s moves the dry-wet interface of the board to the predetermined position, and makes the yield stress difference between the dry area and the wet area of ​​the board 0.25MPa, and uses the displacement sensor to control the final compression amount, and then uses 100~ 150°C hot press compression, continuous compression at a speed of 2-7mm / min, and a pressure of 3MPa or more, can form a compressed and densified middle layer of compressed and densified wood with no compression on the surface and two compressed layers inside.

[0060]...

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Abstract

The invention discloses a production method of a density distribution controllable solid wood compression compacted board. The production method is characterized in that water ratios of various layersin the thickness direction of a solid wood board are adjusted; a dry region and a humid region are formed in the thickness direction in the solid wood board; the yield stress difference between the dry region and the humid region is 0.2 MPa or more; location distribution of the dry region and the humid region are adjusted; then a thermomperessor is used for compression; and a high density compression layer is formed in the humid region of the solid wood board so that the density distribution controllable solid wood compression compacted board is obtained. The solid wood board can be compressed precisely so that location distribution of a compacted layer and an uncompressed layer of wood are precisely controlled; and in addition, the solid wood board has superior mechanical properties anddimensional stability, and the quality of the compression wood is further improved.

Description

technical field [0001] The invention relates to a production method of a solid wood compressed and densified board, in particular to a production method of a solid wood compressed and densified board with controllable density distribution, and relates to the field of solid wood processing. Background technique [0002] Wood compression technology first appeared in the United States and Germany in the 1930s. The original compressed wood was used in military aircraft to replace metal materials in order to prevent it from being detected by radar. It was not until the 1990s that the research on wood compression technology aimed at improving the performance of soft wood and broadening the application range of plantation wood received attention from scholars and industries all over the world. [0003] After more than 20 years of research, wood compression technology has been gradually improved in terms of wood softening, mechanical property control of compressed wood, compression ...

Claims

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Application Information

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IPC IPC(8): B27D1/08
CPCB27D1/08
Inventor 黄荣凤
Owner JIUSHENG WOOD
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