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Wood modification heat treatment process and treatment equipment

A technology of wood modification and treatment equipment, which is applied in the directions of wood heat treatment, wood treatment, pressurized wood treatment, etc., can solve the problems of reduced mechanical properties of wood, affecting the use performance, deepening of wood color, etc., to reduce the change of material color, The effect of reducing production costs and efficient ventilation methods

Inactive Publication Date: 2021-03-09
湖南威达尔木业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the current heat treatment modification of wood, the heat treatment temperature is generally controlled above 200°C under the condition of ensuring the dimensional stability of wood. High heat treatment temperature causes the color of wood to deepen, which affects the market application of heat-treated modified wood and fails to meet user needs

Method used

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  • Wood modification heat treatment process and treatment equipment
  • Wood modification heat treatment process and treatment equipment
  • Wood modification heat treatment process and treatment equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Taking oak planks as wood blanks as an example for modified heat treatment:

[0056] A heat treatment process for wood modification. The wood blanks are dried to a moisture content of 10%-12%. The wood blanks are placed on a trolley at intervals and stacked vertically. The wood blank is kept flat by force, and then undergoes the following processing steps in sequence:

[0057] S1. Nitrogen replacement and preheating treatment: move the trolley carrying the wood blank to the kiln, close the kiln, and vacuumize the inside, and control the pressure at 10 -3 Below Mpa; then fill the furnace with protective gas, choose nitrogen, until the pressure in the furnace is a slight positive pressure; start the atmosphere heating device in the furnace to preheat, the temperature is 40 ℃, and the circulating air is introduced into the kiln; Positive pressure is 300Pa higher than atmospheric pressure;

[0058] S2. Heating treatment: raise the temperature to 65°C, control the heating ...

Embodiment 2

[0067] Taking oak planks as wood blanks as an example for modified heat treatment:

[0068] A heat treatment process for wood modification. The wood blanks are dried to a moisture content of 10%-12%. The wood blanks are placed on a trolley at intervals and stacked vertically. The wood blank is kept flat by force, and then undergoes the following processing steps in sequence:

[0069] S1. Nitrogen replacement and preheating treatment: move the trolley carrying the wood blank to the kiln, close the kiln, and vacuumize the inside, and control the pressure at 10 -3 Below Mpa; then fill the furnace with protective gas, choose nitrogen, until the pressure in the furnace is a slight positive pressure; start the atmosphere heating device in the furnace for preheating, the temperature is 30 ° C, and the circulating air is introduced into the kiln; Positive pressure is 200Pa higher than atmospheric pressure;

[0070] S2. Heating treatment: raise the temperature to 30°C, control the he...

Embodiment 3

[0078] Taking oak planks as wood blanks as an example for modified heat treatment:

[0079] A heat treatment process for wood modification. The wood blanks are dried to a moisture content of 10%-12%. The wood blanks are placed on a trolley at intervals and stacked vertically. The wood blank is kept flat by force, and then undergoes the following processing steps in sequence:

[0080] S1. Nitrogen replacement and preheating treatment: move the trolley carrying the wood blank to the kiln, close the kiln, and vacuumize the inside, and control the pressure at 10 -3 Below Mpa; then fill the furnace with protective gas, choose nitrogen, until the pressure in the furnace is a slight positive pressure; start the atmosphere heating device in the furnace for preheating, the temperature is 50 ° C, and the circulating air is introduced into the kiln; Positive pressure is 400Pa higher than atmospheric pressure;

[0081] S2. Heating treatment: raise the temperature to 100°C, control the h...

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Abstract

The invention discloses a wood modification heat treatment process, which comprises: placing wood blanks on a trolley at intervals, vertically stacking a plurality of layers, applying a downward pressure on the top to make the stress on each position of the wood blanks balanced and keep the wood blanks flat, and sequentially carrying out the following treatment steps: S1, replacing nitrogen gas and carrying out preheating treatment, specifically, vacuumizing in a kiln, replacing nitrogen gas, and carrying out preheating; s2, carrying out heating treatment, specifically, heating and dehumidifying the kiln; s3, carrying out deep drying treatment, specifically, completely drying the inside of the kiln; s4, carrying out vacuum microwave carbonization treatment, specifically, carrying out vacuum microwave carbonization treatment in the kiln; s5, carrying out slow cooling treatment, specifically, carrying out slow cooling d under nitrogen protection; s6, carrying out rapid cooling treatment;and S7, carrying out rewetting treatment, specifically, introducing steam into the kiln to enable the blank to reach a certain water content, and then taking out of the kiln. The invention further provides treatment equipment for the treatment process, and aims to reduce the influence of high-temperature carbonization on the color of the wood on the premise of ensuring the dimensional stability of the wood.

Description

technical field [0001] The invention relates to the technical field of wood heat treatment, in particular to a wood modification heat treatment process and treatment equipment. Background technique [0002] Due to the biological characteristics of wood, its products have phenomena such as shrinkage, swelling, deformation and cracking during use. In order to improve these problems, wood is usually modified. [0003] Wood modification refers to physical or (and) chemical processing methods that improve or change the physical, mechanical, chemical properties and structural characteristics of wood. Its purpose is to improve the natural decay resistance (moth) resistance, acid resistance, alkali resistance, flame retardancy, abrasion resistance, color stability, mechanical strength and dimensional stability of wood. Wood modification technologies include: wood acetylation, wood heat treatment, wood compression and bending, wood bleaching and staining, and other modification tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K1/00B27K5/00B27M1/06F26B3/00
CPCB27K1/00B27K5/001B27K5/0055B27K5/0075B27K5/0085B27M1/06F26B3/00F26B2210/16
Inventor 周明武王雄
Owner 湖南威达尔木业科技有限公司
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