KR20030020751A - Production method and products of high density wood by plastic process - Google Patents

Abstract

PURPOSE: A firing processed wood having the high quality and the high density and a preparation method thereof are provided. The wood has a merit that the manufacturing process is simple, the yield is high and the dimensional stability is excellent. CONSTITUTION: The firing processed high density wood is characterized in that it is prepared by humidity control treating a wood to be processed to have a moisture content state near a fiber saturation point(25% to 30%), thermal compressing the humidity control treated wood by the hot press of 90 to 180 deg.C to have a pressure of 0.05 to 1.5 kg.f/mm2, standing as it is, separating, cooling spontaneously, and then humidity controlling to the existed state.

Description

High density plastic processed wood and its manufacturing method {Production method and products of high density wood by plastic process}

The present invention relates to a high-density plastic processed wood and a manufacturing method thereof having excellent solidity and dimensional stability using general wood as a material, and the manufacturing process is simple and simple, and can be used in various fields throughout the industrial field.

General wood materials have a specific gravity of 1 or less, which is low in hardness and has weaknesses in hardness and durability compared to general industrial materials such as metal or plastic.

Because of these advantages, wood is widely used as daily necessities, but due to its weak surface hardness and high swelling and shrinkage rate, it is accompanied by defects such as splitting and warping. It is a situation that is not used as the material of the intended use.

However, if general wood is processed into high-density dimensional stability wood material, it can be used in a variety of industries such as crafts, living, building materials, and industrial materials.

Therefore, conventionally, processing methods for providing a high density wood material from wood has been proposed.

As an example, wood materials such as jujube trees are thermally compressed to produce high-density wood with a specific gravity of 1 or more, and are used for crafts and tensile materials. Yield that can be produced is extremely low.

In addition, the manufacturing method is an energy waste type that not only decreases the manufacturing efficiency but also requires a lot of energy, moreover, causes a lot of damages in terms of material yield, and has a disadvantage in that it cannot escape the form of a very small domestic domestic industry. As such, there is a need for a high density wood material having excellent dimensional stability and simple manufacturing process.

The present invention is to provide a high-quality high-density plastic processed wood with a simple manufacturing process and high material yield and excellent dimensional stability in order to meet these conventional needs.

In order to achieve the above object, the present invention is to obtain a high-density plastic processed wood by hot pressing using a wood, which is generally widely used as a material, using a hot press (hot press).

It is preferable to pre-treat the wood before heat-hydraulic, and as a pretreatment means, by the method of humidity control and immersing in normal temperature water, the test material is dried to a water content near the fiber saturation point of about 25 to 30%. Humidity treatment.

At this time, the humidity control solution may use moisture to adjust the initial water content of the wood to the fiber saturation point by water spraying or water immersion.

There are two ways to process high density wood materials.

First, high-density wood material is obtained by removing humidity after pre-treatment of fiber-saturated wood in a state of pre-treatment and separating it after a certain period of time in a state of thermal compression with one stage or multi-stage heat compression. To get.

As another method, the wood material is heat-treated in hot water in the range of 30 to 100 ° C., and then the wood is dried and humidified to a moisture content near the fiber saturation point, and then thermally compressed in one or multiple stages as a thermohydraulic machine. After leaving for a certain time, the processed wood material is separated and naturally cooled to obtain high density wood, and the compressed wood is humidified in a dry state to obtain a high density wood material.

At this time, in the first method, it is extremely simple and economically advantageous to obtain the high-density wood material obtained by the present invention by simple heat-hydraulic treatment without softening the wood material of the fiber saturation point. There is also the potential for incompatibility of the finishing material due to non-uniform softening.

According to the prior art, it is well known that the thermal softening pretreatment at a high temperature of 100 ° C. or higher results in softening, but the dimensional stabilization effect is inferior due to loss of wood components, mass loss, and increased hydrophilicity of hemicellulose.

In addition, the second method is a little cumbersome to add a hot water heat treatment process at a weak temperature, but it can be expected to increase the dimensional stability of the manufactured heavy wood, and to control the appropriate softening degree during heat compression. There is this.

Therefore, it may be desirable to select and use any of the above two methods according to the conditions.

Hereinafter, embodiments of the present invention will be described in detail for each process.

Example 1

In Example 1, the wood material is adjusted to a fiber saturation point by humidity pretreatment, and then a high-density plastic processed wood having high hardness and excellent dimensional stability by thermal hydraulic pressure is manufactured.

First step: humidity control process

As a pretreatment method for the wood to be processed, the pretreatment method is a method by humidity control and immersion in normal temperature water to dry and test the test material to a water content near fiber saturation point (25-30%).

The humidity control solution uses water and the humidity control process is completed by adjusting the initial water content of the wood to the fiber saturation point state by water spraying or water immersion.

2nd process: manufacturing process of high density dimensional stabilized wood material

In a state in which the wood of the humidified fiber saturation point in the first step is not softened, heat-compressed at a pressure of 0.05 to 1.5 kgf / mm2 in a single stage or a multi-stage with a heat hydraulic pressure of 90 to 180 ° C. (10 ˜90 minutes) After separation, the mixture is naturally cooled, and the wood is humidified in a dry state, thereby completing the manufacture of the high-density plastic processed wood to be obtained in the present invention.

Example 2

In Example 2, after the low temperature pretreatment process, the wood material is treated with humidity to control the fiber saturation point, and the wood is hot pressed to produce high-density plastic processed wood having high hardness and dimensional stability.

First step: pre-heating and humidity control

The wood to be processed is heat treated in hot water in the range of 30 to 100 ° C. for 2 to 6 hours, followed by a humidity treatment while the wood is dried to a water content near the fiber saturation point.

2nd process: manufacturing process of high density dimensional stabilized wood material

After the hot water treatment in the first step, the wood moistened to the moisture content near the fiber saturation point is compressed to a pressure of 0.5 to 1.5 kgf / mm 2 in one or multiple stages by a heat or hydraulic press at 90 to 180 ° C. After leaving for a time (10 to 90 minutes), the processed wood is separated and naturally cooled, and the wood is air-conditioned to prepare a high-density plastic processed wood to be obtained by the present invention.

Therefore, the present invention is to express the beautiful pattern of the natural wood as a natural material by heat-compressing the general wood using a thermo-hydraulic and then conditioning the wood using a constant temperature and humidity without performing chemical pretreatment such as chemicals At the same time, it is possible to obtain a high-density wood with excellent dimensional stability, so that it can be used for a wide range of industries such as crafts and building materials.

Claims (3)

Humidity is controlled by controlling the wood to be processed to a moisture content near fiber saturation point (25-30%), and the humidity-treated wood is 0.05 to 1.5 kgf with a heat oil pressure of 90 to 180 ° C. A high-density plastic processed wood, characterized in that it is produced by heat compression at a pressure of / mm2, left for 10 to 90 minutes in the above state, separated, cooled naturally, and then humidified in an air condition. Humidity treatment process to control the wood to be processed (humidity control) to the moisture content near the fiber saturation point (25-30%), and the humidity-treated wood 0.05 ~ 1.5 with a thermal oil pressure of 90 ~ 180 ℃ A method for producing a high-density plastic processed wood, characterized in that the thermal compression at a pressure of kgf / ㎠, left for 10 to 90 minutes in the above state, separated, naturally cooled and then humidified in air condition. The high-density plastic working according to claim 1, wherein the wood to be humidified is heat-treated in hot water in the range of 30 to 100 ° C. for about 2 to 6 hours, and then the wood is dried and humidified to a moisture content near the fiber saturation point. wood.