Process for manufacturing a triple-wall container

Details Process for manufacturing a triple-wall container Process for manufacturing a triple-wall container

1974-03-07

1976-06-08

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264173, 425DIG234, B29C 1707

Patent

active

039623963

ABSTRACT:
A process for manufacturing a thermoplastic polymer container having a triple-wall structure is provided in which the outer and inner laminates are composed of an olefin polymer and the medial laminate is composed of polyamide. The medial polyamide laminate is characterized as containing, incorporated therein, 3 to 45% by weight of an ethylene copolymer containing 0.1 to 10% by mole, in polymerized form, of at least one metal salt of acrylic or methacrylic acid, and having a thickness of 2 to 30% by weight based on the total thickness of the three laminates. The container is manufactured by extruding the polymer melts while the three independent streams of the polymer melts to be formed into the three laminates are joined together within a die such that the thickness of said medial laminate is 2 to 30%, based on the total thickness of the three laminates, and then blow-molding the extruded composite polymer tube into the shape of a container.

REFERENCES:
patent: 3457337 (1969-07-01), Turner
patent: 3819792 (1974-06-01), Ono et al.

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