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A method for preparing plywood by using discarded medical masks and plywood

A technology for plywood and masks, which is applied in the joining of wooden veneers, chemical instruments and methods, and manufacturing tools, etc., can solve the problems of difficulty in recycling, increase the burden of environmental pollution, etc., and achieve mechanical properties such as avoiding incineration treatment and gluing strength. Excellent, wide-ranging effects

Active Publication Date: 2022-06-28
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that when waste plastics are used, it is difficult to recycle, and they need to be cleaned and crushed, which increases the burden of environmental pollution; at the same time, due to the compatibility of waste plastics and wood, it is necessary to consider the modification of waste plastics.

Method used

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  • A method for preparing plywood by using discarded medical masks and plywood
  • A method for preparing plywood by using discarded medical masks and plywood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare plywood as follows:

[0046] Step 1: Cut off the mask belt and metal nose clip from the discarded medical mask, and take out and flatten the meltblown cloth and non-woven fabric in it.

[0047] In the second step, five 1.5mm thick poplar veneers are selected and placed in an oven at 60° C. to dry for 5 minutes, with a moisture content of about 14%.

[0048] The third step is to assemble the blank. Place 20g / m between adjacent layers of veneers 2 Meltblown cloth and non-woven fabric, 1% sanding powder, and the adjacent layers of veneer textures are placed perpendicular to each other.

[0049] Step four, hot pressing and activation. The assembled slab was placed in a hot press for hot pressing and voltage activation at the same time. The hot pressing temperature was 165° C., the pressure was 1.0 MPa, the time was 40 s / mm, and the negative electrode voltage was 10 kV.

Embodiment 2

[0051] Prepare plywood as follows:

[0052] Step 1: Discard the medical mask minus the mask strap and metal nose clip, and take out and flatten the meltblown cloth in it.

[0053] In the second step, seven 0.8mm thick eucalyptus veneers are selected and placed in an oven at 60° C. for drying for 10 minutes, with a moisture content of about 8%.

[0054] The third step is to assemble the blank. Place 100g / m between adjacent layers of veneers 2 Discarded meltblown cloth, 10% sawdust powder, and adjacent layers of veneer textures are placed perpendicular to each other.

[0055] Step four, hot pressing and activation. The assembled slab is placed in a hot press for hot pressing and voltage activation at the same time. The hot pressing temperature is 180°C, the pressure is 1.5MPa, the time is 90s / mm, and the negative electrode voltage is 20kV.

Embodiment 3

[0057] Prepare plywood as follows:

[0058] Step 1: Discard the medical mask minus the mask strap and metal nose clip, and take out and flatten the meltblown cloth in it.

[0059] In the second step, three 3.5mm thick fir veneers are selected and placed in an oven at 50° C. for 20 minutes, with a moisture content of about 6%.

[0060] The third step is to assemble the blank. Place 50g / m between adjacent layers of veneers 2 Meltblown cloth, 7% sanding powder, and the adjacent layers of veneer textures are placed perpendicular to each other.

[0061] Step four, hot pressing and activation. The assembled slabs were placed in a hot press for hot pressing and voltage activation at the same time. The hot pressing temperature was 190° C., the pressure was 1.2 MPa, the time was 30 s / mm, and the negative electrode voltage was 15 kV.

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Abstract

The invention belongs to the technical field of plywood production, and specifically relates to a method for preparing plywood by using discarded medical masks and the plywood. The plywood is obtained after the slab is hot-pressed and voltage-activated along the thickness direction; the thermoplastic resin-based material includes melt-blown cloth from discarded medical masks; the wood-reinforced material is wood powder or wood fiber. The invention makes full use of the meltblown cloth in the discarded medical masks, prepares the discarded masks into plywood with excellent mechanical properties and low release of free formaldehyde, and avoids the impact of the incineration of the discarded medical masks on the atmospheric environment, thus achieving environmental protection Effect.

Description

technical field [0001] The invention belongs to the technical field of plywood production, and in particular relates to a method for preparing plywood by using discarded medical masks and a plywood. Background technique [0002] Disposable medical masks (disposable medical masks, DMM) provide great convenience for people's lives, but they can only be used once and waste energy. DMM is generally composed of meltblown cloth, non-woven fabric, mask belt and nose clip. Among them, the main component of meltblown cloth and non-woven fabric is polypropylene (PP). At present, the recycling and processing methods of waste DMM are mainly high temperature incineration, landfill degradation or blending with other polymers. The above method has high energy consumption, long processing time and complicated process, and cannot make full use of waste DMM. [0003] Wood-based panels, especially plywood, are one of the main products in modern interior decoration materials. However, plywo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27D1/04B27D1/08B32B21/13B32B21/14B32B7/12B32B37/06B32B37/10B32B37/12B32B38/00B32B38/16
CPCB27D1/04B27D1/08B32B21/13B32B21/14B32B7/12B32B37/06B32B37/10B32B37/1207B32B38/0008B32B38/164B32B2037/1215B32B2038/166
Inventor 詹天翼陈威吕建雄彭辉吴俊李美英张耀丽卢晓宁
Owner NANJING FORESTRY UNIV
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