Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1978-06-23
1980-10-21
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 455, 26432813, 264DIG83, 425166, 425552, 425588, 4254501, 425451, B29D 2700, B29F 106
Patent
active
042293952
ABSTRACT:
Molten synthetic resin material containing foaming agent in an amount of 0.05 to 5 percent by weight is injected into a pre-pressurized mold cavity in a mold which is closed by a relatively low clamping force having a coefficient in the range of 10 to 40, said coefficient being represented as a ratio of clamping force to maximum injection shot volume. The above injection step is carried out for at least 3 seconds. After the injection step has been initiated, the pre-pressurized mold is released to atmosphere during the injection step at the soonest. At least two molds may be used to be alternately charged with said material.
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Weir, Clifford L. "New Foam Molding Process Offers New Product Versatility", in Modern Plastics, Mar. 1969, pp. 68-70, 72.
"Krauss-Maffei TSG Injection Machines", in British Plastics, Nov. 1970, pp. 129-132.
Meyer, Wolfgang "Do Advanced Structural Foam Molding Processes Reduce Part Cost?" in Journal of Cellular Plastics Jan./Feb., 1978, pp. 50-58.
Kataoka Hiroshi
Nagumo Tadashi
Yasuike Akio
Anderson Philip
Asahi-Dow Limited
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