Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Stratified or layered articles
Patent
1978-12-21
1981-02-03
Czala, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Stratified or layered articles
264118, B29J 506
Patent
active
042488206
ABSTRACT:
A method is provided for forming a wood product comprised of wood flakes and binder intermixed therein, and including a hole or aperture molded into the product, the aperture including a densified, high strength periphery. The method includes the steps of providing a female die plate having a forming surface and a bore extending through the die plate, the bore converging in the direction away from the forming surface. A male die plate is also provided in opposed relation to the female die plate, the male die plate having a forming surface and a tapered forming member aligned with the bore in the female die plate. A mat comprised of wood flakes and intermixed binder is placed between the die plates, and the die plates are forced together to compress the mat between the forming surfaces, thereby forming a rigid composite body. The die plates also form a tapered aperture in the composite body, the tapered forming member and the complementary converging bore in the female die plate causing localized increased density of the periphery of the formed aperture.
REFERENCES:
patent: 3158902 (1964-12-01), McPherson
patent: 3661688 (1972-05-01), Wheeler
patent: 3846219 (1974-11-01), Kunz
patent: 3873662 (1975-03-01), Cartlidge
Board of Control of Michigan Technological University
Czala Donald E.
Hall James R.
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