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A production method of solid wood compression and densification board with controllable density distribution

A technology of density distribution and board production, which is applied in the direction of wood compression, wood processing equipment, and the joining of wooden veneers. It can solve the release of harmful substances and other problems, and achieve the effect of increasing value, expanding the field of use, and improving quality and performance

Active Publication Date: 2019-10-29
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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  • A production method of solid wood compression and densification board with controllable density distribution
  • A production method of solid wood compression and densification board with controllable density distribution
  • A production method of solid wood compression and densification board with controllable density distribution

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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 solid wood compression and densification board with controllable density distribution, which adjusts the moisture content of each layer in the thickness direction of the solid wood board, forms a dry area and a wet area in the thickness direction inside the solid wood board, and the difference between the dry area and the wet area If the yield stress difference is above 0.2MPa, adjust the position distribution of the dry area and the wet area, and then compress with a hot press to form a high-density compressed layer in the wet area of ​​the solid wood board, and obtain a solid wood compressed and densified board with controllable density distribution. The invention can precisely compress the solid wood board, so that the position distribution of the densified layer and the uncompressed layer of the wood can be precisely and controllable; in addition, the invention has more superior mechanical properties and dimensional stability, and further improves the quality of the compressed wood .

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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Patent Type & Authority Patents(China)
IPC IPC(8): B27M1/02B27D1/08
CPCB27D1/08
Inventor 黄荣凤
Owner JIUSHENG WOOD
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