Multi-layer tubing assembly for fluid and vapor handling...

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 11/127 (2006.01) B29C 47/00 (2006.01) B29C 47/06 (2006.01) B32B 1/08 (2006.01) F16L 9/12 (2006.01) F16L 11/12 (2006.01)

Patent

CA 2275142

A multi-layer tubing assembly for use in fuel-line applications. An extruded innermost semi-conductive layer of ethylene tetrafluoroethylene has a surface resistivity in the range of 101 to 106 ohm/sq. An inner permeation-resistant layer of soft ethylene tetrafuoroethylene is coextruded around the innermost layer at temperatures below 600 degrees Fahrenheit. An adhesive layer of polymer blend coextruded around the inner layer has a multi-phase morphology wherein one phase is miscible with ethylene tetrafluoroethylene and another phase is miscible with polyamide. An outer layer of nylon (12) is coextruded around the adhesive layer.

L'invention porte sur un ensemble tube multicouche, utilisable dans le cadre d'applications relevant du domaine des conduits de carburant. Dans ce type de tube, la couche extrudée la plus intérieure, semi-conductrice, en tétrafluoroéthylène d'éthylène, possède une résistivité en surface de l'ordre de 10?1¿ à 10?6¿ ohm par carré. Une couche interne, résistant à la perméation, en tétrafluoroéthylène d'éthylène mou, est co-extrudée à des températures inférieures à 600 degrés Fahrenheit. Une couche adhésive faite d'un mélange polymère, co-extrudée autour de la couche interne, possède une morphologie multi-phases, avec une phase susceptible de se mélanger avec du tétrafluoroéthylène d'éthylène et une autre, avec un polyamide. Une couche externe de nylon 12 est co-extrudée autour de la couche adhésive.

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