Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1979-02-23
1981-03-10
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264216, 264DIG84, 425224, 425817C, B29D 2704
Patent
active
042553709
ABSTRACT:
A method and apparatus for making flat topped foamed buns (e.g. polyurethane) in a continuous foaming process. In accordance with the method, continuous thin film tubular members are guided onto each side of the central trough defining conveyor of a continuous pouring system, and a central trough defining film member generally covering the central conveyor is guided thereover prior to the dispensing head. The edges of the tubular members are subsequently guided upward over guides at each side of the trough so that the tubular define upward sloping side walls traveling at an angle and rate determined in accordance with the rate of longitudinal travel and the rate of rise of the foaming reactants so as to encourage the sides of the bun to the same height of rise as the center region of the bun. Continuous slitting of the tubular members at an appropriate elevation allows the material thereof to progress longitudinally with the cured bun.
REFERENCES:
patent: 3091811 (1963-06-01), Hackert
patent: 3123856 (1964-03-01), Dye et al.
patent: 3719734 (1973-03-01), Petzetakis
patent: 3726623 (1973-04-01), Ferstenberg
patent: 3751197 (1973-08-01), Petzetakis
patent: 3768937 (1973-10-01), Haga et al.
patent: 3809512 (1974-05-01), Blackwell et al.
patent: 3812227 (1974-05-01), Blackwell et al.
patent: 3875276 (1975-04-01), Haga et al.
patent: 4069285 (1978-01-01), Morgan
Anderson Philip
Behr Omri M.
Science Union et Cie Societe Francaise de Recherche Med.
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