Wood and wood product drying method

A drying method and technology of wood products, applied in the processing of wood products, wood, and the drying field of wood products, can solve the problems of drying stress, drying defects, gradients, etc.

Active Publication Date: 2019-01-29
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the drying process of wood, the water moves from the inside of the wood to the surface of the wood, and then evaporates from the surface. The drying defect in the drying process is mainly due to the fact that the water on the surface of the wood evaporates too fast, and the internal water has no time to move to the surface of the wood, resulting in a moisture gradient. Drying stress and finally drying defects

Method used

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  • Wood and wood product drying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] 1. Determination of wood moisture content

[0128] Take random samples from the wood or wood products to be dried, and measure the initial moisture content of the selected wood or wood product samples: weigh the initial weight of the sampled wood (G 0 : 15.5kg), then put the wood in an oven at (100±3)°C to dry to constant weight, and weigh (G 干 : 10kg), wood initial moisture content (M 木初 ,%) is calculated according to the following formula:

[0129] m 木初 =(G 0 -G 干 ) / G 干 ×100%=(15.5-10) / 10×100%=55%

[0130] The size of the test material Daguozi sandalwood in the present embodiment is 2000mm (length) * 40mm (thickness) * 100mm (width).

[0131] 2. Pretreatment of drying medium (adjusting the moisture content of drying medium)

[0132] 2A. Dry the sea sand in the drying medium at a temperature of (100±5)°C, and dry it to a constant weight, that is, until the weight of the drying medium is constant, put the drying medium in a container with a desiccant and cool it...

Embodiment 2

[0169] 1. Determination of wood moisture content

[0170] Except that the size of the red sandalwood is 2000mm (length) * 20mm (thickness) * 100mm (width), the wood initial moisture content is 60%, all the other are identical with embodiment 1;

[0171] 2. Drying medium pretreatment

[0172] Except adding water to the sea sand dried to absolute dryness, and mixing uniformly, adjusting the water content of the drying medium sea sand to 50%, and preparing a pretreatment drying medium with a water content of 50%, the rest are the same as in Example 1 ;

[0173] 3. Palletizing and filling with drying medium

[0174]Except that the loaded pretreatment drying medium is 10cm higher than the top layer of wood in the stack; the distance between two adjacent layers of supports is 6cm (usually 3-18cm), and the top of the wood to be dried on the next layer of support is placed on the same level as the upper layer. Except that the bottoms of the supports are spaced apart by 3.5cm (usual...

Embodiment 3

[0179] 1. Determination of wood moisture content

[0180] Except that the size of the red sandalwood is 2000mm (length) * 20mm (thickness) * 100mm (width), the wood initial moisture content is 30%, all the other are identical with embodiment 1;

[0181] 2. Drying medium pretreatment

[0182] Except adding water to the sea sand dried to absolute dryness, and mixing uniformly, adjusting the water content of the drying medium sea sand to 25%, and preparing a pretreatment drying medium with a water content of 25%, the rest are the same as in Example 1 ;

[0183] 3. Palletizing and filling with drying medium

[0184] Same as embodiment 1;

[0185] 4. Drying treatment of wood / wood products

[0186] Same as Example 1, the drying time is 52h.

[0187] According to the national standard "GB / T 6491-1999 Drying Quality of Sawn Timber", the prepared dry wood was evaluated, and the evaluation results are shown in Table 1.

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Abstract

The invention discloses a wood and wood product drying method. The wood and wood product drying method comprises the following steps that the wood or the wooden product is dried by taking the porous solid particles as a drying medium, and the temperature of the drying medium is kept to be 50-90 DEG C in the drying process. According to the wood and wood product drying method, the porous medium isused as a drying medium for wood and products of the wood, the heating is uniform, the heat transfer efficiency is high, the drying time is remarkably shortened, the drying quality is high, the dryingeffect is good, so that the drying defects such as warping during the drying process are avoided, the VOC in the drying process is prevented from being released into the air, is directly retained insand, and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to a treatment method for wood and wood products, in particular to a drying method for wood and wood products, and belongs to the technical field of wood processing and energy saving and emission reduction. Background technique [0002] During the drying process of wood, the water moves from the inside of the wood to the surface of the wood, and then evaporates from the surface. The drying defect in the drying process is mainly due to the fact that the water on the surface of the wood evaporates too fast, and the internal water has no time to move to the surface of the wood, resulting in a moisture gradient. Drying stress and finally drying defects [0003] Patent 201710450541.8 discloses a drying device for wood processing, including a drying box, one side of the connecting spring is connected to a mounting plate, one side of the mounting plate is provided with a clamping plate, and the top of one side of the clamping plate is B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/00
CPCF26B3/00
Inventor 何正斌伊松林钱京王振宇曲丽洁
Owner BEIJING FORESTRY UNIVERSITY
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