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Compressed wood and preparation method thereof

A technology for compressing wood and wood, applied in wood processing, manufacturing tools, wood processing appliances, etc., can solve the problems of easy springback of compressed wood, uneven heat of wood, rise, etc., short time to achieve, low water absorption recovery rate, Overcome the effect of serious environmental pollution

Active Publication Date: 2014-04-30
JIUSHENG WOOD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, this preparation method uses a cold press. After high-frequency heating, the core temperature of the wood rises rapidly. At this time, the cold press plate will absorb a large amount of heat, resulting in uneven heat inside the wood. Deformation fixation
It was found that the compressed wood obtained by the above-mentioned high-frequency heating technology is prone to rebound phenomenon

Method used

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  • Compressed wood and preparation method thereof

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preparation example Construction

[0018] The invention provides a kind of preparation method of compressed wood, wherein, the method comprises the following steps:

[0019] (1) Carrying out the first high-frequency heating to the wood with a moisture content of 12-30% by weight, so that the core temperature of the wood reaches 80-120°C;

[0020] (2) hot pressing the wood obtained in step (1);

[0021] (3) Carrying out the second high-frequency heating to the wood obtained in step (2), so that the core temperature of the wood reaches 180-220°C.

[0022] In the present invention, hot pressing refers to compressing wood under a certain pressure under the heating condition of a hot pressing plate.

[0023] According to the present invention, the first high-frequency heating, the second high-frequency heating and hot pressing can be implemented on the same equipment, or can be implemented separately on different equipment, as long as the purpose of the present invention can be achieved. Preferably, the first high...

Embodiment 1

[0048] This embodiment is used to illustrate the preparation method of the compressed wood provided by the present invention and the compressed wood prepared by the method.

[0049] (1) The artificial forest poplar is made into a chord-oriented board with a size of 500mm (length) × 150mm (width) × 60mm (thickness) and a moisture content of 18% by weight, and placed on a high-frequency hot press (Shijiazhuang Development Zone Era Electric Co., Ltd., the model is GJW-PI-336-JY, the same below) Preheating, the preheating temperature is 180 ° C, and the preheating time is 2 seconds;

[0050] (2) Carry out the first high-frequency heating on the preheated plate, the frequency of the high-frequency electromagnetic wave is 6.78MHz, and the heating time is 4min, so that the core temperature of the plate reaches 100°C, and then maintain the core temperature at 100°C , hold time is 1min;

[0051] (3) Then press the plate on both sides in the radial direction for hot pressing, the compr...

Embodiment 2

[0059] (1) Make chordal plates with dimensions of 500mm (length)×150mm (width)×75mm (thickness) and a moisture content of 16% by weight from Chinese fir, and preheat them on a high-frequency hot press at a temperature of 200 ℃, the preheating time is 5 seconds;

[0060] (2) Carry out the first high-frequency heating on the preheated plate, the high-frequency electromagnetic wave frequency is 6.78MHz, and the heating time is 5min, so that the core temperature of the plate reaches 105°C, and then maintain the core temperature at 105°C , the holding time is 1.5min;

[0061] (3) Then press the plate on both sides in the radial direction for hot pressing, the compression rate of hot pressing is 45%, the hot pressing temperature is 200°C, the hot pressing pressure is 20MPa, and the closing speed is 0.5mm / s;

[0062] (4) Carry out the second high-frequency heating on the compressed plate, the high-frequency electromagnetic wave frequency is 6.78MHz, and the heating time is 1min, so ...

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Abstract

The present invention discloses a compressed wood preparation method and compressed wood prepared through the method. The method comprises: (1) carrying out first high-frequency heating on wood with a water content of 12-30 wt%, such that the wood material core temperature achieves 80-120 DEG C; (2) carrying out hot pressing on the wood obtained in the step (1); and (3) carrying out second high-frequency heating on the wood obtained in the step (2), such that the wood material core temperature achieves 180-220 DEG C. The compressed wood prepared by using the preparation method has characteristics of resilience resistance, simple steps, short required time, substantially-increased density, substantially-increased surface hardness, substantially-increased wear resistance, low water absorption recovery rate, and low moisture absorption recovery rate.

Description

technical field [0001] The invention relates to compressed wood and compressed wood produced by the method. Background technique [0002] Compressed wood is a reinforced material with hard texture, high density and high mechanical strength produced after light wood is processed under certain external conditions such as temperature and pressure. After the wood is compressed and compacted, due to the great changes in the internal tissue structure, the physical and mechanical properties have also undergone corresponding changes. Among them, the most significant changes are manifested in the enhancement of mechanical strength, reduction of deformation, and improvement of surface wear resistance, thereby effectively improving the quality of wood and increasing the utilization value of wood. [0003] Wood must be softened before it is compressed, otherwise the wood's cell walls will be destroyed during compression. Softening methods are generally divided into hydrothermal treatm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K5/00
Inventor 黄荣凤吕建雄张耀明赵有科周永东夏捷郭飞
Owner JIUSHENG WOOD
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