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A high-efficiency production method of small-diameter composite materials

A production method and technology of small-diameter timber, applied in wood treatment, wood treatment details, wood processing equipment, etc., can solve the problems of high straightness of logs, low material utilization rate, cumbersome processing, etc., and achieve good dimensional stability, High production efficiency and good quality

Active Publication Date: 2021-06-25
NANJING FORESTRY UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the lack of large-diameter log resources, large-diameter beams and columns are still in short supply. Scholars and manufacturers have explored how to combine small-diameter timber and branch timber into large-diameter timber, such as processing the end faces into trapezoidal timber. , regular hexagons, etc. to splice, there are special equipment required, and the processing is cumbersome, the straightness of logs is high, and the material utilization rate is low. The small-diameter timber after high-temperature saturation treatment is hot-glued, and then paved in the same direction. Pack it and compress it, so that the small-diameter wood with a round appearance will be easily extruded into a hexagonal shape due to heat to fill the gaps between each other. The small-diameter wood has mutual contact surfaces and is glued into a whole. It can be made into a Composite materials with various cross-sections such as square, round and rectangular, etc., are fixed in the mold and cured and dried in a high-temperature tunnel kiln to obtain small-diameter composite materials

Method used

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  • A high-efficiency production method of small-diameter composite materials
  • A high-efficiency production method of small-diameter composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, the method for manufacturing cylindrical composite material, is made up of following steps:

[0018] a) Small-diameter wood pretreatment: first peel off the outer skin of the small-diameter wood, polish the scars, cut it to a fixed length, control the moisture content at 20%, 30% or 40%, and heat the small-diameter wood with too much curvature Straighten, tie a certain volume of small-diameter timber with steel wire or string between the head and the tail, and measure its volume by water immersion method. The small-diameter timber in the outer layer requires high strength, less scarring, and small diameter grade. It is recommended to place the timber with a diameter grade greater than 35mm in the middle of the composite material;

[0019] b) Saturated steam is heated and softened. Put the bundled small-diameter timber into a closed pressure tank, and pass high-temperature saturated steam into it. Start timing when the temperature reaches 150°C, and the ti...

Embodiment 2

[0022] Embodiment 2, the method for manufacturing rectangular column type composite material, is made up of following steps:

[0023] a) Small-diameter wood pretreatment, first peel off the outer skin of the small-diameter wood, polish the scars, cut it to a fixed length, and control the moisture content at 20%, 30%, 40% or 60%, and the small diameter with too much curvature The wood is straightened by heating, and a certain volume of small-diameter wood is tied tightly with steel wires or strings alternately between the head and the tail, and its volume is measured by the water immersion method. The outer layer of small-diameter wood requires high strength, less scarring, and small diameter grades. Wood with a diameter grade greater than 35mm is recommended to be placed in the middle of the composite material;

[0024] b) Saturated steam heating and softening: put the bundled small-diameter timber in a closed pressure tank, and pass high-temperature saturated steam into it. T...

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Abstract

The invention is a high-efficiency production method of small-diameter composite materials, which includes the following process steps: a) pre-treatment of small-diameter materials; b) heating and softening with saturated steam; c) sizing and hot-pressing forming; d) continuous heating and curing of slabs and dry. Advantages: The small-diameter timber after high-temperature saturation treatment is heat-applied, and then paved and compressed in the same direction. The small-diameter timber will be easily extruded into a hexagonal shape due to heat to fill the gaps between each other. The small-diameter timber is in contact with each other and glued Combined into a whole, composite materials with different cross-sections are made according to the needs. The composite materials are fixed in the mold and cured and dried in a high-temperature tunnel kiln. The composite materials produced by this process have high utilization rate of small-diameter materials, high production efficiency and high quality. Well, the source of the material is sustainable.

Description

technical field [0001] The invention relates to a high-efficiency production method of small-diameter composite materials, which belongs to the technical field of wood-based panel manufacturing in the wood industry. Background technique [0002] Sub-small fuelwood refers to sub-grade logs whose material is inferior to the lowest grade of processed logs, but still has a certain use value; wooden sticks, wooden poles, short logs and fuelwood with a length of less than 2m or a diameter class of less than 8cm. These small-diameter materials cannot be effectively utilized and are burned as firewood. For this reason, how to use small-diameter materials through processing and reorganization to make better use of inferior materials is a problem for my country, which is short of forests and materials. Said it is especially necessary. [0003] Commonly used wood compression deformation fixation methods mainly include: heat treatment, steam treatment, cross-linking reaction, etc. Heat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27D1/08B27D5/00B27K5/06
CPCB27D1/08B27D5/00B27K5/06
Inventor 许斌李延军梁星宇张齐生
Owner NANJING FORESTRY UNIV
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