Method for densifying wood and densified wood

A densification and wood technology, which is applied in wood treatment, wood processing equipment, wood treatment details, etc., can solve the problems of inability to obtain densified wood, difficult to achieve industrialization, harm to human health, etc., and achieves reduced production costs and simple equipment. , the effect of less volume loss

Active Publication Date: 2011-02-09
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot obtain densified wood, but can only obtain overall densified wood, which will undoubtedly lead to a great reduction in the volume of the wood, which is very economically uneconomical
Moreover, the cross-linking reaction of low-molecular-weight resins for wood surface densification not only pollutes the environment, is harmful to human health, but also has high costs.
In recent years, there has also been a formaldehyde reaction catalyzed by sulfur dioxide. Although this method reduces the chemical degradation of the wood itself, it still pollutes the environment and is difficult to achieve industrialization.

Method used

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  • Method for densifying wood and densified wood

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Embodiment approach

[0053] According to the first embodiment of the present invention, such as figure 1 As shown, the cross-sectional shape of the dense layer 1 is rectangular, and the dense layer 1 has two layers, the two dense layers are respectively located on the two surfaces of the wood, and the undensified layer 2 is distributed in the dense layer 1 . According to this embodiment, the ratio of the total thickness of the compacted layer to the thickness of the undensified layer may be 1:60-1:0.5, and more preferably the ratio of the thickness of the compacted layer to the thickness of the undensified layer is 1:20-1 : 0.1. The thickness of one dense layer may be equal to or not equal to the thickness of another dense layer.

[0054] According to the second embodiment of the present invention, such as figure 2 As shown, the cross-sectional shape of the dense layer 1 is rectangular, and the dense layer 1 is one layer, and the undense layer 2 is two layers, and the dense layer 1 is located b...

Embodiment 1

[0066] This embodiment is used to illustrate the wood densification method provided by the present invention and the densified wood obtained by the wood densification method.

[0067] The cross-section (i.e. two end faces) of the chord-direction plate with the size of 400mm (length) × 100mm (width) × 20mm (thickness) and moisture content of 7% by weight made of plantation poplar wood is 60°C with melting point. Seal with paraffin wax, the amount of paraffin wax is 1.09 grams, then soak the sealed plate in water at 20°C for 60 minutes, take out the plate (a layer of water is attached to the surface of the plate, and the amount of water attached is 27.93 grams) and place it on a hot press for preheating , the preheating temperature is 180°C, the preheating time is 30 seconds, and then the preheated plate is pressed on both sides in the radial direction for hot pressing, the compression ratio of hot pressing is 25%, and the hot pressing temperature is 180°C , the hot pressing pre...

Embodiment 2

[0075] This embodiment is used to illustrate the wood densification method provided by the present invention and the densified wood obtained by the wood densification method.

[0076] It is 60 ℃ of paraffin seals with fusing point that the size of the plantation poplar made is 400mm (length) * 100mm (width) * 20mm (thick), moisture content is 7% by weight, paraffin sealing, paraffin consumption 1.18 grams , and then soak the sealed plate in water at 20°C for 120 minutes, then take out the plate (a layer of water is attached to the surface of the plate, and the amount of water attached is 32.9 grams) and place it on a hot press for heating. The preheating temperature is 180°C. The preheating time is 20 seconds, and then the preheated plate is hot-pressed in the radial direction, the hot-pressing temperature is 180°C, the hot-pressing pressure is 16MPa, the hot-pressing speed is 2 mm / s, and then kept for 70 minutes. A compacted wood with a compression ratio of 25% can be obtaine...

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Abstract

The invention discloses a method for densifying wood and densified wood manufactured by the same. The method comprises: sealing the cross section of wood by using a hydrophobic material, wherein the water content of the wood is less than 12 weight percent; coating softener on the surface and/or shallow layer of the sealed wood; and performing the hot pressing of the wood of which the cross section is sealed and which is coated with the softener at a temperature above the boiling point of the softener to densify the wood. The method for densifying wood can compress the wood to different extent according to needs. The method is simple and easy to operate, requires short time and simple equipment and makes product cost low. The densified wood manufactured by the method of the invention is greatly improved in surface density, hardness and wear resistance.

Description

technical field [0001] The invention relates to a method for densifying wood and densified wood produced by the method. Background technique [0002] In order to improve the physical and mechanical properties of low-density soft fast-growing wood, various treatments of wood have reached a consensus in the academic circles. Among them, the processing method of compressing low-density wood to improve its physical and mechanical properties has always been the main research topic of scholars from various countries. topic. At present, domestic and foreign studies on the mechanism of compression deformation of fir, cedar and poplar wood have been qualitatively studied, and the mechanism of deformation fixation of compressed wood has been discussed. [0003] There are many methods for wood compression treatment and its deformation fixation, which are mainly classified into two categories: physical methods and chemical methods. Among them, the chemical method is commonly used to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K5/00
Inventor 黄荣凤吕建雄王艳伟赵有科
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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