Sequentially coextruded coolant conduit

Details Sequentially coextruded coolant conduit Sequentially coextruded coolant conduit

1994-12-22

1996-10-01

Scherbel, David

Pipes and tubular conduits

Flexible

Corrugated

138137, 138141, 138DIG2, 138DIG3, 138DIG7, F16L 1115

Patent

active

055603980

ABSTRACT:
A coolant conduit which is an elongate tubular article for an apparatus requiring cooling by a cooling agent, such as an engine, for example, an internal combustion engine, includes a plurality of layers which are provided by sequential coextrusion thereof and which are adjoined thereby, each layer of the plurality being comprised of a polymeric material which is thermoplastically processable. The plurality of layers may include an inner layer which is composed of a polymeric material which is substantially inert to cooling agent and which is substantially non-swelling, and an outer layer which is composed of at least one polyamide and which is pressure resistant. The coolant conduit may include a plurality of longitudinal sections, and at least one layer of the plurality of layers may then be composed of a polymeric material which differs between longitudinal sections thereof as is made possible by sequential coextrusion thereof.

REFERENCES:
patent: 3900048 (1975-08-01), Isham et al.
patent: 3917898 (1975-11-01), Iketani et al.
patent: 3990479 (1976-11-01), Stine et al.
patent: 3998715 (1976-12-01), Bohm et al.
patent: 4165765 (1979-08-01), Gilbu et al.
patent: 4167953 (1979-09-01), Carlstrom
patent: 4867269 (1989-09-01), Lalikos et al.
patent: 5024667 (1991-06-01), Malcolm et al.
patent: 5062456 (1991-11-01), Cooke et al.
patent: 5170011 (1992-12-01), Martucci
patent: 5284184 (1994-02-01), Noone et al.

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