Thickness control method of compressed layer of wood layered compression

A technology of thickness control and compression layer, applied in the direction of wood compression, etc., can solve the problem of not explaining how to control the thickness of the compression layer, etc., and achieve the effect of improving the elastic modulus

Inactive Publication Date: 2017-10-20
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Abstract
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  • Application Information

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Problems solved by technology

In the past, there have been some research reports on the density gradient and density distribution of wood compressed by layered compression, the formation of layered compression, the properties of hardness, strength, and deformation fixation, but these studies only reported that layered compression can Implemented, but does not explain how to control the thickness of the compressed layer

Method used

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  • Thickness control method of compressed layer of wood layered compression
  • Thickness control method of compressed layer of wood layered compression
  • Thickness control method of compressed layer of wood layered compression

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the compression layer thickness control method of wood layered compression, as attached figure 1 As shown, the method specifically includes the following specific steps:

[0034] 1) Moisture content of wood: wood with moisture content from dry to saturated

[0035] Wood with a moisture content of less than 14%, hydrophobic materials such as paraffin, are sealed and then soaked in room temperature water or water heated to below 100°C, or soaked directly without sealing, for 10 minutes to 6 hours, preferably 30 minutes to 3 hours; wood with a moisture content of 14% to 30% can be used directly, or soaked for a short time, sealed or unsealed during soaking, and the time is determined according to the position of the target compression layer; wood with a moisture content greater than 30% is directly preheated ;

[0036] 2) Wood thickness: (determined according to the preset thickness of the compressed layer, the original density of the wood and the final de...

Embodiment 2

[0063] Embodiment 2: the fitting equation of compression layer position and preheating temperature and time is as shown in table 1,

[0064]

[0065] Table 1

[0066] The applicant conducts the test on wood with a thickness of 25mm, and the required compression amount is 5mm. During the preheating treatment, the test is divided into two groups, and the first group sets the preheating temperature as the variable x 1 (or x 2 ), the warm-up time is set to 720 seconds, according to y 1 =a 1 ln(x 1 )-c 1 The logarithmic function relationship of or The quadratic function relationship of the wood is controlled by adjusting the preheating temperature to control the position of the compression layer of the wood to achieve the selective directional densification of the wood; the second group sets the preheating time as the variable x 3 and x 4 , the preheating temperature is 180°C, according to The quadratic function relationship of or The exponential function relationshi...

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Abstract

The invention discloses a thickness control method of a compressed layer of wood layered compression. The thickness control method comprises the following specific steps that a, wood is soaked with water; b, the wood is put onto a press which is preheated to 70-250 DEG C; c, the press is closed rapidly, the wood is preheated, and the preheating time is determined according to the position where the compressed layer is formed; d, the wood is compressed through the press, and the compressing speed is 0.05-3 mm/s; e, heat preservation is conducted, specifically, heat preservation and standing are conducted for 20 minutes or longer after compression is completed; and f, cooling is conducted, the press is opened, and the compressed wood is obtained. By the adoption of the thickness control method, thickness control of the compressed layer of wood layered compression can be effectively achieved, selective oriented compaction of the wood is achieved, the using performance and using value of the wood are greatly improved, and the thickness control method has high economic benefits and social benefits.

Description

technical field [0001] The invention relates to a compression layer thickness control method for wood layer compression, which relates to the fields of wooden floors and furniture. Background technique [0002] The layered compression method under hydrothermal control is a new type of compression method. Layered compression is to compress and compact the surface or middle layer of wood to form a compressed wood with both compressed and uncompressed layers (Huang et al., 2012). This compression method is realized through process design by taking advantage of the porosity and anisotropy of wood. Layered compressed wood, the density of the compressed layer can reach 0.8g / cm 3 Above, the uncompressed layer maintains the original density; the maximum hardness can be increased by more than 500%; the bending strength of the surface compressed wood is increased by more than 200%, and the elastic modulus is increased by more than 200%. This compression method overcomes the disadva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27M1/02
CPCB27M1/02
Inventor 黄荣凤高志强伍艳梅李任
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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