Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1974-07-18
1976-09-28
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 54, 264328, 264DIG5, 264DIG83, 425817R, B29D 2700, B29F 106
Patent
active
039831965
ABSTRACT:
A settable foam plastic product being formed in a mold cavity is compressed, after a film has formed on the surface of the product, but before final setting of the product. This compression step, which is carried out by reducing the volume of the mold cavity, has the advantage of increasing the accuracy of reproduction of fine surface detail. The compression step also permits stops to be readily removed to enable subsequent full opening of the mold cavity. This use of movable stops in turn facilitates absorption of the forces encountered during the injection step with less massive machine structure than heretofore, resulting in the possibility of economical manufacture of larger products. The machine also includes an improved mold cavity construction in which the parting planes are perpendicular to the main plane of the product, and incorporating laterally movable end and side mold members to facilitate removal of the product and the formation of surface detail on edge surfaces of the product. The machine is also fitted with injection nozzles that incorporate a plunger as well as a valving action.
REFERENCES:
patent: 3268636 (1966-08-01), Angell
patent: 3436446 (1969-04-01), Angell
patent: 3632729 (1972-01-01), Bielfeldt
patent: 3767742 (1973-10-01), Robin
patent: 3825637 (1974-07-01), Robin
czerski, J., "Injection-Moulded Foams." In Plastics & Polymers, Dec. 1971, pp. 406-411.
Anderson Philip
Ingraham Robert B.
The Dow Chemical Company
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