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A high-temperature heat treatment process for fast-growing plantation eucalyptus wood

A high-temperature heat treatment and artificial forest technology, applied in wood treatment, wood treatment details, wood processing equipment, etc., can solve the problems of long natural drying time, low drying material yield, and reduced mechanical properties, so as to shorten the drying time and produce The effect of high material rate and balanced moisture content reduction

Inactive Publication Date: 2016-04-13
GUANGXI ECO ENG VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because fast-growing plantation eucalyptus wood is prone to end cracking, warping, shrinkage and bending deformation during drying; therefore, this process has the following disadvantages for processing fast-growing plantation eucalyptus wood: (1) In the stage of wood preparation, natural drying Long time; conventional kiln drying, eucalyptus wood is very easy to crack, warp and shrink, it is difficult to control, and the drying yield is low
(2) After high temperature treatment, the mechanical properties decrease relatively greatly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of fast-growing plantation eucalyptus wood high temperature heat treatment process step of the present invention is as follows:

[0029] (1) Felling and transportation of fast-growing eucalyptus trees in plantations: First, before cutting down fast-growing eucalyptus trees in fast-growing plantations, release the growth stress: use a drill to drill a hole at the pole of the standing tree facing east and 1.3 meters above the ground, and release the part Growth stress; the direction of cutting trees should be cut in the west direction, the purpose is also to release part of the growth stress. Secondly, during the transportation of logs, end-sealing treatment is carried out: after felling and cutting according to the specified size, plastic bags are immediately used to wrap both ends of the logs to control the stress release caused by the loss of water at the ends, and the purpose is to prevent end cracks due to water loss.

[0030] (2) Log sawing: Control the relea...

Embodiment 2

[0040] A kind of fast-growing plantation eucalyptus wood high temperature heat treatment process step of the present invention is as follows:

[0041] (1) Felling and transportation of eucalyptus trees in fast-growing plantations: the felling and transportation methods are the same as those in Example 1.

[0042] (2) Log sawing: the log sawing method is the same as that in Example 1.

[0043] (3) Boil the sawn wood at high temperature: the boiling temperature is 85°C, and the boiling time is 80 minutes. After the wood is boiled at high temperature, it can reduce the drying stress, thereby avoiding drying defects, and softening to increase its plasticity.

[0044] (4) Stacking: Stacking is the same as the traditional wood dry stacking method. The requirements are: the heights of several beams supporting the stack should be consistent and kept on the same level; The top should be kept on a vertical line from top to bottom, and should land on the support beam at the bottom of t...

Embodiment 3

[0051] A kind of fast-growing plantation eucalyptus wood high temperature heat treatment process step of the present invention is as follows:

[0052] (1) Felling and transportation of eucalyptus trees in fast-growing plantations: the felling and transportation methods are the same as those in Example 1.

[0053] (2) Log sawing: the log sawing method is the same as that in Example 1.

[0054] (3) Boil the sawn wood at high temperature: the boiling temperature is 95°C, and the boiling time is 100 minutes. After the wood is boiled at high temperature, it can reduce the drying stress, thereby avoiding drying defects, and softening to increase its plasticity.

[0055] (4) Stacking: Stacking is the same as the traditional wood dry stacking method. The requirements are: the heights of several beams supporting the stack should be consistent and kept on the same level; The top should be kept on a vertical line from top to bottom, and should land on the support beam at the bottom of ...

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Abstract

The invention provides a high-temperature heat treatment process for fast-growing plantation eucalyptus wood, the steps are as follows: (1) pretreatment of fast-growing plantation eucalyptus; (2) boiling the sawed wood at high temperature; (3) stacking; (4) The stacked wood is sprayed and steamed to adjust humidity and dry; (5) preheating; (6) water vapor protection medium temperature treatment; (7) inert gas protection high temperature treatment; (8) cooling and tempering process. The process of the invention greatly shortens the drying time in the high-temperature heat treatment process of eucalyptus wood, and at the same time solves the problems that the conventional kiln-dried eucalyptus wood is easily deformed such as end cracking, warping and shrinkage, and the yield rate is low. The yield rate is high, which can reach 60%-70%; using the water vapor and nitrogen combined treatment method of the present invention, the mechanical strength of the treated eucalyptus wood decreases by an average of 28%; and the color and carbonization degree after heat treatment are uniform; dimensional stability Greatly improved, the equilibrium moisture content is 45% lower than that of untreated.

Description

technical field [0001] The invention relates to a high-temperature heat treatment process for fast-growing plantation eucalyptus wood. Background technique [0002] With the implementation of the national natural forest protection project, the development and utilization of plantation fast-growing timber has become an important way to solve the contradiction between timber supply and demand. The study of high temperature heat treatment wood technology is a physical processing method to efficiently use wood and increase the added value of wood. Heat treatment can not only make wood have good dimensional stability, corrosion resistance, weather resistance, environmental protection, etc., but also change the color of ordinary wood to imitate precious wood, and improve its use range and added value. This kind of wood heat treatment process has attracted more and more attention from enterprises and wood science researchers. Since the middle of the last century, different wood h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K5/00
Inventor 巫国富黄圣霞
Owner GUANGXI ECO ENG VOCATIONAL & TECHN COLLEGE
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