Method for producing flame-retardant oriented strand boards with full eucalyptus wood scraps

Abstract

The invention provides a method for producing flame-retardant oriented strand boards with full eucalyptus wood scraps. The method comprises the working procedures of material preparation, drying, debarking and impurity removal, sorting and storage, respective gluing on surface layers and a core layer, graded laying, preheating pressing molding, sanding and finishing, and the like, wherein the surface layers are coated with isocyanate sawdust powder compound adhesive, the core layer is coated with flame-retardant compound urea-formaldehyde resin adhesive, core layer shavings are divided to form a three-layer structure which includes a core layer middle layer, a core layer upper surface layer and a core layer lower surface layer, vertical laying is adopted for the core layer middle layer, and transverse laying is adopted for the core layer upper surface layer, the core layer lower surface layer and the surface layers. According to the oriented strand boards produced with the method, the static bending intensity in the parallel direction ranges from 30 MPa to 40 MPa, the parallel elasticity modulus ranges from 4600 MPa to 4770 MPa, the vertical elasticity modulus ranges from 1500 MPa to 1780 MPa, the thickness swelling rate of water absorption of 24 hours ranges from 10% to 17%, the vertical nail-holding power is as high as 89000 N, and the dimensional stability and reliability are good. In addition, the oriented strand boards produced with the method further have the excellent effect of flame retardance.

Description

technical field [0001] The invention belongs to the field of artificial board manufacture, in particular to a method for producing flame-retardant oriented strand 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 slices is usually 40-...

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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 production process of plywood 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 raw material to produce eucalyptus wood leftover oriented strand board, and there is no production of oriented strand board with flame retardant function

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