Plastic article or earthenware shaping or treating: apparatus – Including ventilating type hood or chamber encasing a...
Patent
1994-06-29
1996-12-31
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Including ventilating type hood or chamber encasing a...
425 4R, 4251291, 425546, 425557, 425812, 425817R, 425DIG60, B28B 150
Patent
active
055892027
ABSTRACT:
A method and apparatus for producing a molded polyurethane foam without using low-boiling solvents such as Freon and methylene chloride which present problems when used as a blowing agent. The polyurethane foam has the same good appearance and soft feeling as that produced with low-boiling solvents. A polyurethane foam is produced by injecting a polyurethane material into an evacuated cavity and permitting it to expand so that it flows and fills the cavity, said polyurethane material being composed of 100 parts by weight of polyol component and 0.1-0.6 part by weight of water as a blowing agent. The cavity pressure may be maintained high spontaneously or low while the polyurethane material is flowing in the cavity. When the polyurethane material has reached the final fill position in the cavity, the fore-end of the polyurethane material is discharged from the cavity.
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Okano Hidenobu
Watanabe Katsunori
Dang Vi Duong
Silbaugh Jan H.
Toyoda Gosei Co,., Ltd.
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