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Single-side surface layer compressed wood and preparation method thereof

A technology for compressing wood and surface layers, which is applied in lamination, lamination devices, wood compression, etc., can solve the problems of difficult control of compressed wood density distribution, affecting wood yield, and unsatisfactory use effects, so as to prevent tile bending deformation and peak dense layer movement, easy control, and the effect of reducing thermal stress

Inactive Publication Date: 2018-09-28
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The one-sided surface compression technology of wood is still in the research stage. When the existing technology produces one-sided surface compressed wood, due to the existence of certain moisture inside the wood, the moisture transfers from the hot end to the cold end during asymmetric heating to form a moisture content gradient, and The structure of the compressed wood on one side surface is asymmetrical, and the compressed wood will inevitably have tile bending deformation, which will affect the wood yield, and in severe cases, the wood will be scrapped. At the same time, the existence of moisture will make the internal density distribution of the compressed wood difficult to control, so use The effect is not ideal

Method used

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  • Single-side surface layer compressed wood and preparation method thereof
  • Single-side surface layer compressed wood and preparation method thereof
  • Single-side surface layer compressed wood and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Double-sided planing of Populus tomentosa wood is prepared into a board with a size of 920×120×23.5 mm, which is put into a drying oven and gradually heated to 150° C. to dry to a super dry state;

[0032] (2) Turn on the hot press, raise the temperature of the upper platen (hot plate) to 150°C, and keep the lower platen (cold plate) unheated, and pave the 3 pieces of poplar wood after ultra-high temperature drying neatly in a single row on the cold plate. On the board, a thickness gauge of 21 mm is placed on both sides of the wood;

[0033] (3) closing the press, making the hot plate on the press contact with the poplar wood upper surface, preheating for 90 seconds;

[0034] (4) The pressure of the press is set to 8 MPa, and the wood is compressed to the required thickness at a feed rate of 0.08 mm / s, and then maintained for 120 seconds;

[0035] (5) Reduce the pressure to 1 MPa, and maintain this pressure, the temperature is 150 ° C, and the pressure holding time...

Embodiment 2

[0039] (1) Plane the rubber wood on both sides to prepare a board with a size of 1100×105×20.5 mm, put it into a drying oven and gradually heat it up to 190°C and dry it to a super dry state;

[0040](2) Turn on the hot press, raise the temperature of the upper platen (hot plate) to 190°C, and keep the lower platen (cold plate) unheated, and pave the 3 pieces of rubber wood after ultra-high temperature drying in a single row on the cold plate 18 mm thickness gauges are placed on both sides of the wood;

[0041] (3) Close the press, make the hot plate on the press contact with the upper surface of the rubber wood, and preheat for 120 seconds;

[0042] (4) The pressure of the press is set to 15 MPa, and the wood is compressed to the required thickness at a feed rate of 0.15 mm / s, and then maintained for 250 seconds;

[0043] (5) Reduce the pressure to 3 MPa, and maintain this pressure, the temperature is 190 ° C, and the pressure holding time is 40 minutes;

[0044] (6) The pr...

Embodiment 3

[0047] (1) Double-sided planing of Poplar tomentosa wood is prepared into a board with a size of 980×150×23.5 mm, and it is put into a drying oven and gradually heated to 210° C. to dry to a super dry state;

[0048] (2) Turn on the hot press, raise the temperature of the upper platen (hot plate) to 210°C, and keep the lower platen (cold plate) unheated, and pave the 3 pieces of poplar wood after ultra-high temperature drying neatly in a single row on the cold plate. On the board, a thickness gauge of 21 mm is placed on both sides of the wood;

[0049] (3) closing the press, making the hot plate on the press contact with the poplar wood upper surface, preheating for 180 seconds;

[0050] (4) The pressure of the press is set to 12 MPa, and the wood is compressed to the required thickness at a feed rate of 0.18 mm / s, and then maintained for 360 seconds;

[0051] (5) Reduce the pressure to 2 MPa, and maintain this pressure, the temperature is 210 ° C, and the pressure holding ti...

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Abstract

The invention discloses a single-side surface layer compressed wood and a preparation method thereof. The single-side surface layer compressed wood comprises a peak density layer, a dense layer and awood original density layer, wherein the connection between the peak density layer, the dense layer and the wood original density layer is a natural connection of wood fibers of the wood; the preparation method of the single-side surface layer compressed wood comprises the following steps that a hot pressing plate on a press machine is heated to 150-220 DEG C, and the wood is laid on a cold pressing plate after the wood is dried; the upper surface of the hot pressing plate and the upper surface of the wood are in contact and pre-heating; under the pressure of 6-15 Mpa, the pressure is maintained after the wood is compressed to the required thickness; at the temperature of 150-220 DEG C, the pressure is maintained after reducing the pressure to 1-3 Mpa; and the single-side layer compressedwood and the preparation method thereof is obtained after unloading. According to the single-side surface layer compressed wood and the preparation method thereof, the problem of single-side compressed wood tile bending deformation is solved by utilizing a temperature difference method, the single-side surface layer compression of the wood is realized, the production time is short, the energy consumption is low, the operation is simple and convenient, chemical drugs do not need to be added in the treatment process, and the method has the advantages of being efficient, environmentally friendlyand the like; and the hardness, the flatness, the production efficiency and the percent of pass of the surface of the compressed wood are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of wood product production technology, and more specifically relates to a single-side-surface compressed wood and a preparation method thereof. Background technique [0002] Among the four major materials that human beings rely on for survival, wood is the only natural material that is renewable, degradable, low-carbon and environmentally friendly. Wood has a high strength-to-weight ratio, superior processing performance, and beautiful patterns and colors, and is deeply loved by consumers. At present, my country has completely stopped the commercial logging of natural forests, and the timber structure has gradually changed from natural forests to fast-growing plantations. However, fast-growing plantation wood has low density, soft material and poor stability. It is mainly used in plywood, pulp and paper making, logistics packaging and other fields, and the utilization of solid wood is not high. Improving th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27M1/02B32B21/13B32B21/14B32B7/08B32B37/06B32B37/10
CPCB27M1/02B32B7/08B32B21/13B32B21/14B32B37/06B32B37/10B32B2307/734B32B2309/02B32B2309/04B32B2309/12
Inventor 涂登云周桥芳赵湘玉胡传双谢迪武
Owner SOUTH CHINA AGRI UNIV
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