Manufacturing method of low-glue environmental protecting plywood

A manufacturing method and technology of plywood, applied in the direction of manufacturing tools, joining of wooden veneers, chemical instruments and methods, etc., can solve problems such as difficulties in importing high-quality large-diameter logs, rising prices of plywood raw materials, and expensive chemical raw materials, etc. Achieve low production cost, increase product value, and reduce production cost

Active Publication Date: 2016-08-03
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although my country's plywood products are becoming more and more competitive in the international market and occupying a higher and higher share, they are also facing severe challenges, mainly reflected in: the politicization of forest issues and the economic and social development of log producing countries The import of high-quality large-diameter logs is becoming more and more difficult, and the price of chemical raw materials is becoming more and more expensive, leading to a rapid rise in the price of raw

Method used

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  • Manufacturing method of low-glue environmental protecting plywood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The small-diameter fast-growing poplar is cut into a certain length of wood with a circular saw. The length of the wood is determined according to the requirements of the plywood product format, usually the length of the plywood product is ±100-150mm. Put the wood section in the cooking tank for softening treatment to increase the plasticity of the wood to improve the quality of the rotary cut veneer. In order to ensure the quality of plywood, a special stripping machine is required to remove the bark of the wood section. Then, use a mechanical centering machine to determine the center of rotation of the wood section, and then use a wooden machine to place the wood section on a rotary cutting machine, and then rotary cut it into a veneer with a thickness of 1mm.

[0024] Put the poplar veneer in a hot plate dryer to dry under a certain pressure (less than 0.1MPa). The drying temperature should not be too high and should be controlled below 80°C to prevent warping and de...

Embodiment 2

[0028] The small-diameter fast-growing poplar is made into a veneer with a thickness of 2mm and a moisture content of 6% by the same steps as in Example 1.

[0029] Put the dried veneer on the feeding conveyor belt of the integrated device of low-temperature plasma modification and micro-sizing of wood veneer, enter the low-temperature plasma treatment area driven by the feeding roller, and adjust the upper and lower four pairs of discharge The distance between the electrodes was 10 mm. Turn on the low-temperature plasma power supply and adjust the processing power to 4.5KW. When the voltage between the electrodes reaches the air discharge voltage, a dielectric barrier discharge is formed between the electrodes to generate low-temperature plasma. Poplar veneers are suspended in the air at a speed of 10m / min. The four pairs of electrodes pass continuously through the gap, and the low-temperature plasma modification treatment is performed on the upper and lower surfaces of the v...

Embodiment 3

[0035] Masson pine logs were made into veneers with a thickness of 2mm and a moisture content of 6% by the same steps as in Example 1.

[0036] Put the dried veneer on the feeding conveyor belt of the integrated device of low-temperature plasma modification and micro-sizing of wood veneer, enter the low-temperature plasma treatment area driven by the feeding roller, and adjust the upper and lower four pairs of discharge The distance between the electrodes was 10 mm. Turn on the low-temperature plasma power supply and adjust the processing power to 4.5KW. When the voltage between the electrodes reaches the air discharge voltage, a dielectric barrier discharge is formed between the electrodes to generate low-temperature plasma. Masson pine veneers are suspended in the air at a speed of 10m / min. The four pairs of electrodes pass continuously through the gap, and the low-temperature plasma modification treatment is performed on the upper and lower surfaces of the veneer at the sam...

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Abstract

The invention discloses a manufacturing method of low-glue environmental protecting plywood, and belongs to the technical field of manufacturing of artificial boards. The process comprises the following steps: a wood section is rotationally cut to 1-3 mm wood veneers; the wood veneers are dried to adjust the water content to 2-15%; the normal-pressure and low-temperature plasma modifying treatment is performed for two surfaces of the veneers; through ultrasound and cyclone synergistic effect, adhesive is atomized as particles with a diameter of smaller than 40 microns to spray the surfaces of the veneers; the applying quantity of the adhesive on one surface is controlled within 10-80 g/m2; the veneers are assembled to a blank by perpendicular fiber grain directions of the veneers on adjacent layers; and the blank is hotly pressed to prepare the low-glue environmental protecting plywood. The performance of the product prepared by the method accords with the national plywood standard requirement; the formaldehyde emission reaches the E0-grade requirement; the adhesive dosage is reduced by 30-70% compared with a traditional gluing mode; the product quality is prominently promoted; and the production cost is obviously reduced. In addition, the method is energy-saved and environment-friendly in production process; and production equipment is convenient for operation, high in efficiency, excellent in controllability and capable of realizing continuous automatic operation.

Description

technical field [0001] The invention relates to a method for manufacturing an environment-friendly plywood with low sizing amount. It belongs to the technical field of wood-based panel manufacturing. Background technique [0002] Since the 21st century, my country's wood-based panel industry has developed rapidly and has become the largest country in the world's wood-based panel production, consumption and import and export trade. Among the many wood-based panel products, the output and export volume of plywood products have always ranked first. According to relevant data, the output of plywood in my country reached 174 million m3 in 2014, accounting for 57.6% of the total wood-based panel output. The products are exported to more than 100 countries and regions in the world, with an export volume of 10.2614 million m 3 , is the largest category of wood-based panel exports, accounting for 72% of the total export volume of wood-based panels. Although my country's plywood p...

Claims

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Application Information

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IPC IPC(8): B27D1/08B27D1/00B27K5/00B27G11/00B32B37/10B32B37/12
CPCB27D1/005B27D1/08B27G11/00B27K5/002B32B37/10B32B37/12B32B37/1284
Inventor 周晓燕曹倚中陈敏智陈卫民王翔史书凯蒋帅南万京林卞杰
Owner NANJING FORESTRY UNIV
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