Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1994-06-29
1995-11-07
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 50, 264 51, 264102, 264DIG78, B29C 4406
Patent
active
054645824
ABSTRACT:
A method and apparatus for producing a molded polyurethane foam without using low-boiling solvents such as Fleon 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.
REFERENCES:
patent: 3824199 (1974-07-01), Nadeao et al.
patent: 3954537 (1976-05-01), Alfter et al.
patent: 4206170 (1980-06-01), Sassaman et al.
patent: 4285893 (1981-08-01), Contastin
patent: 4510106 (1985-04-01), Hirsch
patent: 4517313 (1985-05-01), Nakatani
patent: 4572865 (1986-02-01), Gluck et al.
patent: 4576970 (1986-03-01), Ganster
patent: 4579700 (1986-04-01), Cavender
patent: 4909972 (1990-03-01), Britz
patent: 4916168 (1990-04-01), Pham et al.
patent: 4988271 (1991-01-01), Kumasaka et al.
patent: 5100926 (1992-03-01), Kondo
patent: 5132329 (1992-07-01), Lynch
patent: 5166183 (1992-11-01), Franyutti
Patent Abstracts of Japan, vol. 88, No. 1007 (M750) (1988).
U.S. Application of Maguchi, Appln. No. 07/946,077.
Patent Abstracts of Japan, vol. 5, No. 190 (M-100) (1981).
Patent Abstracts of Japan, vol. 8, No. 057 (M-283) (1984).
Patent Abstracts of Japan, vol. 4, No. 105 (M-023) (1980).
Okano Hidenobu
Watanabe Katsunori
Kuhns Allan R.
Toyoda Gosei Co,., Ltd.
LandOfFree
Method for molding polyurethane foam under subatmospheric pressu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for molding polyurethane foam under subatmospheric pressu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for molding polyurethane foam under subatmospheric pressu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-195509