Method for compressing and compacting wood materials in vacuum

A wood material and vacuum compression technology, which is applied in the direction of wood processing appliances, wooden veneer joints, manufacturing tools, etc., can solve the problems of low utilization efficiency of production equipment, poor mechanical properties of products, and high bending strength, so as to improve mechanical properties. Effects of strength, molecular number reduction, and crystallinity improvement

Active Publication Date: 2019-04-09
NANJING FORESTRY UNIV
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Problems solved by technology

[0012] In view of the defects existing in the existing impregnation treatment, as well as the problems of long production cycle, high production cost, low utilization efficiency of production equipment and poor mechanical properties of products in wood compression and densification technology and conventional wood composite material manufacturing and processing, the present invention discloses A method for compressing and densifying wood materials is developed, which can simultaneously compress, color and shape wood materials, and the mechanical strength of wood materials after treatment fully meets the requirements, which is comparable to that of compressed wood materials prepared by ordinary hot pressing. Ratio, small color difference, high bending strength, large specific modulus, and also improves the bonding strength of existing wood-glued materials

Method used

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  • Method for compressing and compacting wood materials in vacuum
  • Method for compressing and compacting wood materials in vacuum
  • Method for compressing and compacting wood materials in vacuum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The specific test steps of this experiment are as follows:

[0043] 1) Drying and surface sanding treatment of fir boards: sanding fir boards with a thickness of 23-24mm to 22mm, and the moisture content after drying is 10%.

[0044] 2) Cutting the dried and surface-sanded Chinese fir board: use a sliding table saw to make a fir specimen of 200mm×100mm×20mm (axial direction×chord direction×radial direction). Accurately measure the quality, width, thickness and length of the test piece (mark the position when measuring the thickness), accurate to 0.02mm, record and number the data of the test piece.

[0045] 3) Use a hot press to compress the numbered specimens under the conditions of vacuum and normal pressure (vertical wood chord direction compression): the pressure of the high-temperature thermal compression treatment is 2MPa, the compression rate is 30%, and the heat The pressing time is 30 minutes, and the hot pressing temperature is 180°C, 200°C and 220°C. After ...

Embodiment 2

[0059] The implementation steps of this test are the same as in Example 1, the difference is that

[0060] 1) Sawing: sand the fir board with a thickness of 21-23mm to 20mm, and the moisture content is 10%.

[0061] 2) Vacuum hot pressing: the hot pressing pressure is 2 MPa, the compression ratio is 30%, the hot pressing time is 15 min, and the hot pressing temperatures are 180°C, 200°C and 220°C.

[0062] 4) Pressure relief.

[0063] The detection data of the wood material obtained according to the procedure of Example 2 are as follows.

[0064] Table 4 Experimental detection data

[0065]

[0066] The vacuum compression time in Example 2 was shortened by 15min compared with Example 1. Compared with Example 1, the strength improvement rate of the compressed wood was lower, and the color difference value was smaller, that is, the surface color was less likely to change.

Embodiment 3

[0068] The steps are the same as in Example 2, except that the sanding is to 18mm, the water content is 12%, the compression rate during vacuum hot pressing is 20%, and the compression time is 30 minutes.

[0069] According to the detection data table 5 of the wooden material that the operation of embodiment 3 obtains:

[0070] Table 5 Experimental detection data

[0071]

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Abstract

The invention discloses a method for compressing and compacting wood materials in vacuum, and belongs to the field of wood material production and preparation. According to the method, the wood materials undergo hot-pressing setting treatment under the vacuum condition, the treated wood materials are large in specific modulus, so that the technical problems that in the case of an existing wood material compression and compaction technology, the hot-pressing setting time is long, the manufacturing efficiency is low, the color change and the size are not stable are solved, the compression and compaction manufacturing of the wood materials is performed under the vacuum condition, so that the gluing strength of the wood gluing materials is also improved.

Description

[0001] The application of the present invention is a divisional application, the application number of the parent application: 201711474145.5, the invention name of the parent application: a method for compressing and densifying wood materials, and the application date of the parent application: December 29, 2017. technical field [0002] The invention belongs to the field of production and preparation of wood materials, and more specifically relates to a method for compressing and densifying wood and improving the bonding strength of wood composite materials. Background technique [0003] my country's planted forests amount to 53.25 million hectares, ranking first in the world. Compared with natural forests, artificial forests have the characteristics of fast growth, high growth volume, convenient development and early benefit, timber specifications, stable quality, and easy processing and utilization. However, due to some material defects in artificial forests, such as poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04
CPCB27D1/04
Inventor 卢晓宁洪璐李志远何倩鞠泽辉
Owner NANJING FORESTRY UNIV
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