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A high temperature and high humidity rapid drying process for wood

A high-temperature and high-humidity drying and rapid drying technology, which is applied in the preliminary treatment of promoting the drying of solid materials, drying of solid materials, and arrangement of drying gases, etc. and other problems, to achieve the effect of overcoming shrinkage and collapse, uniform moisture content distribution, and small moisture content deviation.

Active Publication Date: 2016-11-02
贵州保城新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fast-growing wood grows faster and makes it more prone to deformation and cracking, especially during the drying process, it is prone to shrinkage and collapse, which not only reduces the grade of fast-growing wood and reduces the yield of wood, but also makes fast-growing wood easy to deform and crack during later use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Humidification and heating steps: stack 5 pieces of poplar wood with a thickness of 2mm together to form a whole stack, use trays and spacers with uniform specifications, and the distance between the spacers and the end of the wood during stacking is within 3cm, and the distance between the spacers At 15-25cm, the spacers are arranged in a straight line in the vertical direction, and the briquettes are pressed on the stacked wood pile; then the fast-growing poplar wood is stacked in the drying kiln, the kiln door is closed, and the humidification valve is opened. Quick humidification directly humidifies to relative humidity ≥ 98%, so that the drying kiln is filled with water vapor.

[0029] (2) Heating and humidification pretreatment steps: keep the humidification valve open, keep the relative humidity ≥ 98%, then open the heating valve for the first time and quickly heat until the dry bulb temperature is 1°C higher than the wet bulb temperature and keep it for 3 hou...

Embodiment 2

[0033] (1) Humidification and heating steps: stack 2 pieces of maple wood with a thickness of 24mm together to form a whole stack, use trays and spacers with uniform specifications, and when stacking, the distance between the spacers and the end of the wood is within 3cm, and the distance between the spacers is 15~ 25cm, the spacers are neatly arranged in a straight line in the vertical direction, and the briquettes are pressed on the stacked wood pile, then the wood is stacked in the drying kiln, the kiln door is closed, and the humidification valve is opened to quickly humidify inward and directly humidify to relative humidity. ≥98%, so that the drying kiln is filled with water vapor.

[0034] (2) Heating and humidification pretreatment steps: keep the humidification valve open, keep the relative humidity ≥ 98%, then open the heating valve for the first time and quickly heat until the dry bulb temperature is 2°C higher than the wet bulb temperature and keep it for 6 hours.

...

Embodiment 3

[0038] (1) Humidification and heating steps: Use the conventional stacking method to stack the 50mm thick Qinggang wood, use pallets and spacers with uniform specifications, and when stacking, the distance between the spacers and the end face of the wood is within 3cm, and the distance between the spacers is 15-25cm. The strips are neatly formed into a straight line in the straight direction, and the briquettes are pressed on the stacked wood pile; then the wood is stacked in the drying kiln, the kiln door is closed, and the humidification valve is opened to quickly humidify inward and directly humidify to a relative humidity of ≥98%. , so that the drying kiln is filled with water vapor.

[0039] (2) Heating and humidification pretreatment step: keep the humidification valve open, keep the relative humidity ≥ 98%, then open the heating valve for the first time and quickly heat until the dry bulb temperature is 1.5°C higher than the wet bulb temperature and keep it for 7h.

[0...

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Abstract

The invention relates to a wood drying process technology, in particular to a high-temperature and high-humidity rapid drying process method for wood, belonging to the field of wood processing. The high-temperature and high-humidity rapid drying process method comprise the following steps of: (1) humidifying and heating; (2) heating and humidifying pretreatment; and (3) high-temperature and high-humidity drying. According to the invention, the drying process problems that the traditional drying process cannot be used for drying hardwood, difficultly-dried hardwood and fast growing wood easily undergoing shrinkage and collapse after drying are solved, the dried wood is uniform in the distribution of moisture content and low in moisture content gradient in a thickness direction, and the defect that the fast growing wood is shrunk and collapsed after being dried is overcome. Meanwhile, the process flow of the traditional drying technology is simplified, and the most common drying process method with broadest applicable range is formed, is suitable for any varieties of tree wood with the thickness below 100mm and is easier to master by a technician.

Description

technical field [0001] The invention relates to a wood drying process technology, in particular to a high-temperature, high-humidity rapid drying process for wood, which belongs to the field of wood processing. Background technique [0002] Wood is an anisotropic material. The structure of sapwood and heartwood of wood is different, even if the structure of different sapwood or heartwood of the same tree is different, this determines that the "research and application of wood" is a A highly practical subject. As a key process of wood processing and utilization, wood drying also shows its practical characteristics. Therefore, for the research and application of wood drying technology, on the one hand, it is necessary to strengthen the study and research of wood drying theoretical knowledge, including wood characteristics, especially permeability, the characteristics and causes of wood drying defects, the movement state and residual moisture in wood. At the same time, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B9/06F26B3/04F26B1/00F26B21/08F26B21/10
Inventor 葛克宇潘成锋
Owner 贵州保城新材料有限公司
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