Single-side surface layer compressed wood and preparation method thereof

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...

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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

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