Method for manufacturing anti-insect and anti-mold oriented strand board with full eucalyptus leftover materials

Abstract

The invention discloses a method for manufacturing an anti-insect and anti-mold oriented strand board with full eucalyptus leftover materials. The manufacturing method comprises the following steps of: preparing materials, drying, peeling and removing impurities, sorting and storing, respectively gluing on a surface core layer, hierarchically paving, in advance hot press molding, and sanding wood finishes; an isocyanate sawdust powder hybrid adhesive is coated on the surface, and an anti-insect and anti-mold composite urea-formaldehyde resin adhesive is coated on the core layer; wood shavings on the core layer are divided into three-layer structures, comprising intermediate layer of core layer, upper surface layer of core layer and lower surface layer of core layer; the intermediate layer of the core layer is paved longitudinally, and the upper surface layer of the core layer and the lower surface layer and surface layer of the core layer are paved horizontally. For the oriented strand board prepared by the method, the static bending intensity in a parallel direction is in a scope of 33-39 MPA, the parallel elasticity modulus is in the scope of 4614-4779 MPA, the vertical elasticity modulus is in the scope of 1504-1771 MPA, the thickness swelling rate of water absorption in 24 h is in the scope of 10%-17%, and the vertical nail-holding power reaches up to 89000N. In the manufacturing method, a problem that the board is easy to suffer from erosion of white ants and moths is thoroughly solved by adding an anti-insect and anti-mold additive, and the service life of the board is prolonged.

Description

technical field [0001] The invention belongs to the field of artificial board manufacturing, in particular to a method for producing insect-proof and mildew-proof oriented particle board from whole eucalyptus wood scraps. Background technique [0002] Oriented strand board is one of the new varieties of particle board. When the shavings are paved and formed, the upper and lower surface layers of the oriented strand board will arrange the rubber-mixed shavings longitudinally according to the fiber direction, and the core layer shavings will be arranged horizontally to form a three-layer structure board embryo, which is then hot-pressed into an oriented strand board. The particle shape of this particle board requires a larger aspect ratio, and the thickness is slightly thicker than that of ordinary particle board. [0003] Oriented strand board is a log that is peeled and cut into slices with a certain geometric shape along the direction of the wood grain. The size of the sli...

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Problems solved by technology

[0014] The oriented strand board disclosed in the above-mentioned literature discloses the method of pressing the oriented strand board into oriented strand board by using the remaining rotary cut veneer scraps in the plywood production process as raw materials or the broken veneer strips produced during the production of plywood as raw materials, but there is no use of fast-growing eucalyptus board The leftover wood in the production process is used as the raw material to produce the whole eucalyptus wood leftover oriented strand board, and there is no production of the oriented strand board with the function of preventing insects and mildew

Because if OSB is not kept ventilated in time in rainy days, it is easy to be deformed due to air humidity, and even moldy and rotten, resulting in serious musty smell in the room, and most OSBs are made of eucalyptus single pieces bonded by adhesives. After a long time of moisture absorption, the board will warp and deform due to the difference in expansion force

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