A thermal modification method of wood based on normal pressure heating and negative pressure heat preservation process
A technology of thermal modification and wood, which is applied in wood heating, pressurized wood treatment, wood treatment, etc., can solve the problems of complicated and few devices and processes, and achieve the effects of reducing energy consumption, corrosion, and cost
Active Publication Date: 2017-03-15
宿迁亚森械友新材料有限公司
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The mixed treatment process decomposes the heat treatment process into several relatively independent steps. Through the optimization of equipment ratio and process, smaller equipment can be used to achieve higher output, but overall it is much more complicated than other processes in terms of equipment and process. , so it is rarely used
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[0032] The wood thermal modification method based on the normal pressure heating and negative pressure heat preservation process, the specific process steps are as follows:
[0033] 1) Wood pretreatment: This method is suitable for wood sawn timber. The wood to be treated should be dried at high temperature first, and the moisture content should be at a low level, generally around 3%, to prevent the wood from drying out during high temperature treatment. quality problems.
[0034] 2) Wood heating: The treated wood is heated in an atmospheric air environment. see Figure 4, this step can be divided into two stages, the first stage is heated to about 120°C to preheat the wood and further reduce the moisture content of the wood. Due to the low moisture content of wood, the heating rate at this stage can be set at a relatively high level without causing cracking or deformation of the wood. Generally, the initial temperature in the kiln can be set at 70°C. Rapidly raise the temp...
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The invention provides a wood thermal modification method based on a normal-pressure heating and negative-pressure heat-preserving process, and the wood thermal modification method does not need to heat or protect a medium, can quickly heat, is low in energy consumption, is simple in implementation equipment, and is free of potential safety hazard. The wood thermal modification method comprises the following steps: placing wood sawn timber into a treatment kiln and heating the wood sawn timber to a temperature of 115-125 DEG C in a normal-pressure air environment, keeping the temperature for 50-70 minutes, pre-heating wood, and reducing moisture content of the wood; then, rising the wood temperature to a temperature of 150-190 DEG C at a heating rate of 8-12 DEG C / h; then, carrying out vacuum pumping on the treatment kiln, reducing pressure in the kiln to 0.2-0.3atm, and keeping the temperature unchanged for 1-3 hours; and finally, stopping heating, gradually reducing the temperature of the treatment kiln, introducing air into the treatment kiln and gradually restoring the pressure to the normal-pressure level.
Description
technical field [0001] The invention relates to a novel wood modification method for adjusting the appearance color and dimensional stability of wood, and belongs to the field of wood modification. Background technique [0002] Wood thermal modification, also known as wood heat treatment, is a method of heat-treating wood in an inert environment around 200°C. At this temperature level, the hemicellulose in the wood is partially degraded, the crystallinity of the cellulose increases, and the chemical components of the lignin also reorganize, reducing the moisture and hydrophilic groups in the wood, and the chromophoric groups Changes to adjust its material color and increase its dimensional stability. [0003] The laboratory exploration of thermal modification of wood originated in the 1930s, and the industrialization began in the 1990s. According to the pressure level of the processing medium, there are currently four main processes: normal pressure type, negative pressure...
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IPC IPC(8): B27K5/00
CPCB27K5/001B27K5/0075
Inventor 丁涛李延军蔡家斌董会军
Owner 宿迁亚森械友新材料有限公司