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Position control method of compression layer for wood laminated compression

A control method and compression layer technology, which is applied to wood processing appliances, wooden veneer joints, veneer presses, etc., can solve problems such as how to control the compression layer without explaining, so as to improve the performance and price of use, and resist Effects of increased flexural strength and elastic modulus

Active Publication Date: 2017-09-01
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

However, these previous studies only reported that layered compression can be achieved, but did not explain how to control the location of compressed layer formation.

Method used

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  • Position control method of compression layer for wood laminated compression
  • Position control method of compression layer for wood laminated compression
  • Position control method of compression layer for wood laminated compression

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the compression layer position control method of wood laminar compression, as attached figure 1 As shown, the method specifically includes the following specific steps:

[0025] 1) Seal or soak the wood according to the difference in moisture content;

[0026] For wood with a moisture content below 14%, use hydrophobic materials such as paraffin for end-sealing treatment, and then soak in room temperature water or hot water below 100°C, or soak directly without end-sealing, for 10 minutes to 6 hours, preferably 30 minutes to 3 hours, preheating after soaking; wood with a moisture content of 14% to 30% can be preheated directly, or soaked for a short time, and preheated after soaking for 30 minutes to 3 hours treatment; wood with a moisture content greater than 30% is directly used for subsequent preheating treatment;

[0027] 2) Put the wood on a press that is preheated to 70-250°C (that is, heat the briquette of the press to 70-250°C first), and the pre...

Embodiment 2

[0054] Embodiment 2: the fitting equation of compression layer position and preheating temperature and time is as shown in table 1,

[0055]

[0056] Table 1

[0057] 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 relation of or The exponential function relationship of...

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Abstract

The invention discloses a position control method of a compression layer for wood laminated compression. The method specifically comprises the following steps of (a) preheating: putting spare wood on a pressing machine to be preheated; (b) compressing: compressing the spare wood by using the pressing machine, wherein the compression speed is 0.05 to 3 mm / s; (c) insulating: insulating and standing for 20 minutes or above after compression is completed; and (d) cooling: starting the pressing machine, so that laminated compression wood is obtained. By adopting the position control method, the position control over the compression layer in wood laminated compression can be effectively realized, the selective directional densification of wood is realized, the use performance and the use price of the wood are greatly increased, and the position control method has high economic benefits and social benefits.

Description

technical field [0001] The invention relates to a compression layer position control method for wood layer compression, and relates to the fields of wooden floors and furniture. Background technique [0002] Wood compression technology first appeared in the United States and Germany in the 1930s (Walsh et al., 1923; Olesheimer, 1929). The initial compressed wood was used in military aircraft to replace metal materials in order to prevent detection by radar. Until the 1990s, the research on wood compression technology aimed at improving the performance of soft wood and broadening the application range of plantation wood was paid attention to by scholars and industries all over the world. After more than 20 years of research, wood compression technology, especially moisture-heat softening wood compression technology, has been gradually improved in terms of wood softening, plastic deformation, performance change of compressed wood, compression deformation fixation and its mecha...

Claims

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Application Information

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IPC IPC(8): B27D1/02B27D3/00
CPCB27D1/02B27D3/00
Inventor 黄荣凤高志强李任伍艳梅
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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