Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1983-06-29
1984-07-10
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264279, 2643288, 264336, 264348, B29C 602, B29D 300, B29D 900
Patent
active
044592574
ABSTRACT:
The process for producing a shaped article comprising a polythene terephthalate (PETP) core containing from 0 to 50% of mineral fillers and a covering layer of a second thermoplastics material having a softening point below that of the PETP. The second material and the PETP are injected one after the other into a mould which is maintained at a temperature below the crystallization point of the PETP having regard to its fillers. The second material injected in the first phase acts as a thermal buffer slowing down temperature equalization between the PETP injected in the second injection phase and the mould, thus ensuring the required properties in the PETP core.
REFERENCES:
patent: 3187072 (1965-06-01), Morin
patent: 3263013 (1966-07-01), Morin
patent: 3785217 (1974-01-01), Peura
patent: 3878282 (1975-04-01), Bonis et al.
patent: 3966870 (1976-06-01), Vecchiotti
patent: 4048361 (1977-09-01), Valyi
patent: 4092391 (1978-05-01), Valyi
patent: 4155972 (1979-05-01), Hauser et al.
Cibie Projecteurs
Hoag Willard E.
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