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AssigneeResearch Institute of Wood Industry, Chinese Academy of Forestry
InventorsLiang CHANG, Zheng Wang, Wenjing Guo, Li Gao, Yiping Ren
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The present invention discloses a method for preparation of formaldehyde-free plywood from scrap plastic alloys. Different scrap plastics are used to prepare plastic alloy film, which is then used as an adhesive material for the preparation of new plywood without formaldehyde emission. The formaldehyde-free plywood according to the present invention is prepared by the following steps: different scrap plastics are crushed, cleaned separately, and then corresponding fillers and additives are added to the above crushed material or their mixtures which mixed according to a certain blending ratio; plastic alloy film of certain size and thickness is prepared after the film blowing and rolling processes; after being assembled with wood veneers to form a lay-up mat, the mat is hot pressed and then cold pressed. The present invention provides a method of preparing non-toxic and environmentally friendly formaldehyde-free plywood, solving the problem that the environment and human beings being poisoned by the free formaldehyde released from ordinary plywood and at the same time providing a way of recycling and reusing scrap plastics.
A formaldehyde-free plywood, comprising at least two wood veneers, wherein the two wood veneers are bonded through scrap plastic alloy film free of formaldehyde, said scrap plastics comprising polypropylene and one or more selected from the group consisting of low density polyethylene, high density polyethylene, polyvinyl chloride, polystyrene and polycarbonates, the mass fraction of polypropylene in the scrap plastics being in a range from 40% to 80%.
Dependencies are inferred from the claim text.