Hollow, multi-layered, cross-linked plastic structures and proce

Details Hollow, multi-layered, cross-linked plastic structures and proce Hollow, multi-layered, cross-linked plastic structures and proce

1975-02-07

1976-06-29

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

260873, 264114, 264310, B29C 504, B29D 900, B29D 2308

Patent

active

039668703

ABSTRACT:
Hollow, multi-layered plastic structures are provided comprising a layer of thermoplastic polyester material and a layer of polyethylene, the polyethylene and polyester layers being cross-linked together at their interface. A process for producing such structures which comprises charging a mold with thermoplastic polyester material, rotating and heating the mold so as to fuse and form a layer of the polyester material on the inner surface of the mold, cooling the mold to a point below the melting point of the polyester but above the melting point of a subsequently added cross-linkable polyethylene material, stopping the rotation and charging the mold with the cross-linkable polyethylene material, resuming the rotation of the mold and heating it to a temperature sufficient to fuse and cross-link the polyethylene with the polyester layer, cooling the mold to a point below the melting point of the polyethylene and removing the finished structure from the mold.

REFERENCES:
patent: 2649622 (1953-08-01), Piccard
patent: 2919474 (1960-01-01), Cole
patent: 3214422 (1965-10-01), Mageli et al.
patent: 3350745 (1967-11-01), Schott et al.
patent: 3449191 (1969-06-01), Taylor
patent: 3455483 (1969-07-01), Inklaar
patent: 3816582 (1974-06-01), Tennyson

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