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Vacuum freeze drying forming process for wood fiber composite product

A technology of vacuum freeze-drying and composite materials, applied in the field of deep processing of wood materials, can solve the problems of low added value, poor fluidity, low thermal conductivity, etc., and achieve the effect of no color difference on the surface

Active Publication Date: 2016-10-26
宁波大世界集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the disadvantages of low thermal conductivity, poor fluidity, easy to produce pre-cured layer, difficult exhaust and easy to produce black spots during hot pressing of wood fiber materials, the utilization of wood fiberization has been developed for decades, and it is still limited to the production of flat surfaces. The thickness of fiberboard does not exceed 25mm; the added value is low, and the fiberboard needs to be processed by cutting, milling, engraving, etc., in order to produce wood fiber household products with different styles and exquisite textures

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: A vacuum freeze-drying molding process of a wood fiber composite material product comprises the following specific steps: according to the weight percentage of the wood fiber composite material, wood fiber with a screening value of 20 to 120 mesh and soybean protein adhesive and 10 % preservative, 5% zinc stearate are mixed and stirred evenly to make wood fiber composite raw material; The wood fiber composite raw material that step A is obtained is extruded in the mold that has exhaust passage and temperature measuring passage by extrusion equipment, then Place the mold in an industrial freezer for pre-freezing, set the temperature of the freezer to -40°C, and set the pre-freezing time to 36 hours; send the mold that has been pre-frozen in the industrial freezer into a vacuum freeze-drying equipment until it is completely dry For solidification, set the cold trap temperature to -60°C, vacuum degree to 10Pa, and vacuum freeze-drying time for 48 hours; after ...

Embodiment 2

[0016] Embodiment 2: A vacuum freeze-drying molding process of a wood fiber composite material product includes the following steps: according to the weight percentage of the wood fiber composite material, wood fiber with a screening value of 30 to 100 mesh and blood glue protein adhesive and 8% toner, 2% preservative, and 3% graphene are mixed and stirred evenly to make a wood fiber composite material; Put the mold in the cold storage for pre-freezing, set the temperature of the cold storage to -10°C, and set the pre-freezing time to 12 hours; send the pre-frozen mold in the cold storage to the vacuum freeze-drying equipment until it is completely dry and solidified , set the cold trap temperature to -40°C, the vacuum degree to 100Pa, and the vacuum freeze-drying time for 24 hours; after the vacuum freeze-drying and solidification is completed, it can be molded to be consistent with the mold cavity structure, without black spots, bulges, cracks, or Pre-cured layer, no color d...

Embodiment 3

[0017] Embodiment 3: A vacuum freeze-drying molding process of a wood fiber composite material product comprises the following specific steps: according to the weight percentage of the wood fiber composite material, the wood fiber with a screening value of 40 to 60 mesh and the modified starch adhesive and 5% toner, 5% preservative are mixed together and stirred evenly to make the wood fiber composite raw material; The wood fiber composite raw material obtained in step A is extruded into a mold with an exhaust channel and a temperature measuring channel through an extrusion device, and then Place the mold in the cold storage for pre-freezing, set the temperature of the cold storage to -20°C, and set the pre-freezing time to 24 hours; send the pre-frozen molds in the cold storage to the vacuum freeze-drying equipment until they are completely dry and solidified, and set the temperature of the cold trap The temperature is -30°C, the vacuum degree is set to 0Pa, and the vacuum fre...

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Abstract

The invention discloses a vacuum freeze drying forming process for a wood fiber composite product. Environment-friendly cold-bonding adhesive, wood fibers and other auxiliaries are together made into a wood fiber composite, the wood fiber composite is put into a mold of a specific cavity to be prefreezed, and after certain time is reached, the wood fiber composite is conveyed into vacuum freeze drying equipment for freeze drying curing forming. According to the vacuum freeze drying forming process, a vacuum freeze drying technology is applied to manufacturing of the wood fiber composite product with the combination with the freeze cross-linking curing performance of the environment-friendly cold-bonding adhesive. Compared with thermosetting forming of traditional wood fiber material, the advantages that the wood fiber composite product is free of a pre-cured layer completely, black spots are not generated, bumps and cracking do not appear, and the surface is free of chromatic aberration are achieved, and a brand new field of manufacturing of wood fiber composite products is exploited.

Description

technical field [0001] The invention belongs to the field of deep processing of wood materials, in particular to a vacuum freeze-drying molding process of wood fiber composite material products. Background technique [0002] As a kind of natural biomass composite functional material, trees are not only the green shield of the earth, but also the precious resources and wealth that human beings rely on for survival. With the progress of society and the improvement of living standards, people's consumption demand for high-grade solid wood products continues to increase. With its beautiful vision and comfortable touch, solid wood products have an absolute advantage in the consumption of high-end household products, satisfying people's admiration for natural high-grade wood. However, due to the shortage of timber resources and high processing costs, solid wood products can only be enjoyed by a few classes. [0003] In recent years, wood fiberization has increasingly occupied an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): B27N3/28B27N3/00F26B5/06
CPCB27N3/002B27N3/28F26B5/06
Inventor 赵存挺陈波卜伟筠
Owner 宁波大世界集团有限公司
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