Layered fuel-line hose

Details Layered fuel-line hose Layered fuel-line hose

1990-10-31

1991-12-31

Coe, Philip R.

Pipes and tubular conduits

Flexible

Distinct layers

138140, 138DIG7, F16L 1104

Patent

active

050763296

ABSTRACT:
A layered tubing for use in a motor vehicle has five layers, namely a thick tubular outer layer formed of a Nylon 11 or Nylon 12, a thick tubular intermediate layer of Nylon 6, a thin tubular intermediate bonding layer between and bonded to the thick outer and intermediate layers and formed of polyethylene or polypropylene, a thin tubular intermediate solvent-blocking layer inside the thick layers and formed of a copolymer of ethylene and vinylalcohol, and an inner layer of Nylon 6 inside the blocking layer. The thick outer and intermediate layers each have a thickness of between 0.2 mm and 0.7 mm. The thin intermediate blocking layer comprises by weight 30% to 45% polyethylene and the intermediate blocking layer has a thickness of between 0.1 mm and 0.2 mm. The inner layer has a thickness of at most 0.1 to 0.5 mm and the bonding layer has active side chains of maleic acid anhydride and a thickness of between 0.05 mm and 0.2 mm.

REFERENCES:
patent: 3584656 (1971-06-01), Assendelet et al.
patent: 4614208 (1986-09-01), Skarelius
patent: 4617213 (1986-10-01), Asano et al.
patent: 4647483 (1987-03-01), Tse et al.
patent: 4657285 (1987-04-01), Akiyama et al.
patent: 4746562 (1988-05-01), Fant
patent: 4758454 (1988-07-01), Wood
patent: 4842024 (1989-06-01), Palinchak
patent: 4862923 (1989-09-01), Kitami et al.
patent: 5004649 (1991-04-01), Yamasaki et al.

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