Laminated fuel and vapor return lines

Details Laminated fuel and vapor return lines Laminated fuel and vapor return lines

B - Operations, Transporting

32

B

B32B 1/08 (2006.01) B29C 47/06 (2006.01) B32B 27/08 (2006.01) F16L 9/12 (2006.01) F16L 11/06 (2006.01) F16L 11/12 (2006.01)

Patent

CA 2253222

A multi-layer hydrocarbon vapor-impermeable tube (11) is formed with a nylon outer layer (12) and a vapor barrier inner layer (15) such as ETFE, bonded together by two adhesive layers. The laminated tube is coextruded. The shear on the two adhesive layers are adjusted to bias the first adhesive layer (13) towards the nylon outer layer and the second adhesive layer (14) towards the ETFE barrier layer (15). This permits rapid coextrusion of the laminated tubing. Preferably, both adhesive layers are formed from a blend of nylon and ETFE. The ratio of nylon to ETFE can be adjusted so that the first adhesive layer is preferentially adherent to the nylon layer, and the second adhesive layer is preferentially adherent to the ETFE layer, and both adhesive layers are adherent to each other.

L'invention concerne un tube multicouche (11), imperméable aux vapeurs d'hydrocarbures, qui est constitué d'une couche externe de nylon (12) et d'une couche interne faisant barrière aux vapeurs (15) telle que l'éthylène tétrafluoroéthylène, liées par deux couches adhésives. Le cisaillement exercé sur les deux couches adhésives est ajusté afin de solliciter la première couche adhésive (13) vers la couche externe de nylon, et la seconde couche adhésive (14) vers la couche barrière d'éthylène tétrafluoroéthylène (15). De préférence, les deux couches adhésives sont formés à partir d'un mélange de nylon et d'ETFE. Le rapport de nylon et d'ETFE peut être ajusté de sorte que la première couche adhésive adhère de préférence à la couche de nylon, et que la seconde couche adhésive adhère de préférence à la couche d'ETFE, les deux couches adhésives étant ainsi collées l'une à l'autre.

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