Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1978-07-07
1981-01-06
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 464, 264513, 264516, 264532, 264537, 264255, 264279, 264312, 26432812, 425533, 425577, B29C 1707, B29D 2302, B29F 110
Patent
active
042436206
ABSTRACT:
The present invention is concerning a manufacturing process of an object made of plastic material in a mould comprising especially a die and a punch, this process being particularly interesting in that the obtained preforms may be formed by every known method, including thermoforming, blowing, etc. The process according to the invention is characterized in that a quantity of plastics material is introduced into the cavity of the mould, in that the flow of the material is controlled while it is being introduced into the mould cavity, by displacing at least part of the punch relatively to the die, in that the punch is subjected to a restraining action while the material is being introduced, and in that the cavity is closed and the plastics material contained therein is then compressed by displacing at least part of the punch in relation to the die.
REFERENCES:
patent: 3025567 (1962-03-01), Sherman
patent: 3186600 (1965-06-01), Guignard
patent: 3305892 (1967-02-01), Heider
patent: 3511845 (1970-05-01), Scalora
patent: 3759315 (1973-09-01), Smart
patent: 3778211 (1973-12-01), Moen et al.
patent: 3906066 (1975-09-01), Barrie
patent: 3947176 (1976-03-01), Rainville
patent: 4005164 (1977-01-01), Procter
patent: 4012386 (1977-03-01), Davis
Collombin Andre M.
Curetti Ennio G.
Motosacoche S.A.
Silbaugh Jan H.
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