Multi-layer fuel and vapor tube
AssigneeITT Industries, Inc.
InventorsDavid L. Noone, Frank L. Mitchell
Life of this patent
Estimating the term…
Abstract
A layered tubing for use in a motor vehicle composed of a thick outer tubing having an inner and an outer face, the outer tubing made of an extrudable thermoplastic such as a polyamide like Nylon 12; a thin intermediate bonding layer bonded to the inner face of the thick outer layer, the bonding layer composed of an extrudable melt-processible thermoplastic such as poly butylene terepthalate capable of sufficiently permanent laminar adhesion to the polyamide outer tubing; and an inner layer bonded to the intermediate bonding layer, the inner layer composed of an extrudable, melt-processible thermoplastic such as Nylon 12.
Claims20
A layered tubing for use in a motor vehicle, the tubing comprising:
- a thick flexible outer tubing having an inner and an outer face, the outer tubing consisting essentially of an extrudable thermoplastic having an elongation value of at least 150% and an ability to withstand impacts of at least 2 ft/lbs at temperatures below about −20° C.;
- a thin intermediate bonding layer bonded to the inner face of the thick outer tubing, the bonding layer consisting essentially of an extrudable melt processible thermoplastic resistant to permeation by short-chain hydrocarbons, the bonding layer consisting of a thermoplastic which is chemically dissimilar to the extrudable thermoplastic employed in the outer tubing and is capable of sufficiently permanent laminar adhesion to the inner face of the thick outer tubing;
- and
- an interior layer having a thickness less than the thickness of the outer tubing bonded to the intermediate bonding layer, the inner layer consisting of an extrudable, melt-processible thermoplastic capable of sufficiently permanent laminar adhesion with the intermediate bonding layer having an elongation value of at least 150% and an ability to withstand impacts of at least 2 ft/lbs at temperatures below about −20° C.
A layered tubing for use in a motor vehicle, the tubing comprising:
- an outer tubing having an inner and an outer face, the outer tubing consisting essentially of an extrudable polyamide having an elongation value of at least 150% and an ability to withstand impacts of at least 2 ft/lbs at temperatures below about −20° C.;
- an intermediate bonding layer having a thickness between about 0.05 mm and about 0.2 mm bonded to the inner face of the thick outer tubing, the bonding layer consisting essentially of an extrudable non-polyamide thermoplastic capable of sufficiently permanent laminar adhesion to the polyamide outer tubing and exhibiting at least some resistance to short-chain hydrocarbon molecules conveyed through the tubing;
- and
- an inner layer bonded to the intermediate bonding layer having a thickness between about 0.05 mm and about 0.2 mm, the inner layer consisting essentially of an extrudable, melt processible polyamide capable of sufficiently permanent laminar adhesion with the intermediate bonding layer selected from the group consisting of Nylon 11, Nylon 12, zinc chloride resistant Nylon 6, and mixtures thereof.
Dependencies are inferred from the claim text.