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.
Claims19
A layered tubing for conveying a vapor or liquid, the layered tubing comprising:
- an outer layer having an inner and an outer face and a thickness, the outer layer consisting essentially of an extrudable thermoplastic selected from the group including polyanude, thermoplastic elastomers and mixtures of polyamide and thermoplastic elastomers;
- an intermediate layer connected to the inner face of the outer layer, the intermediate layer consisting essentially of an extrudable melt processible thermoplastic which is chemically dissimilar to the extrudable thermoplastic employed in the outer layer;
- and
- an intermediate layer having a thickness less than the thickness of the outer layer, the interior layer bonded to the intermediate layer, the interior layer consisting of an extrudable, melt-processible thermoplastic which is chemically dissimilar to the thermoplastic employed in the intermediate layer;
- wherein the material employed in the interior, outer and intermediate layers are thermoplastic materials when the tubing is in a use condition.
A layered tubing for conveying a vapor or liquid, the layered tubing comprising:
- an outer layer having an inner and an outer face, the outer layer consisting essentially an extrudable thermoplastic polyamide;
- an intermediate layer consisting essentially of an extrudable non-polyamide thermoplastic capable of sufficiently permanent laminar adhesion to the polyamide outer layer and exhibiting at least some resistance to short-chain hydrocarbon molecule conveyed through the tubing;
- and
- an inner layer consisting essentially of an extrudable, melt processible thermoplastic polyamide capable of sufficiently permanent laminar adhesion with the intermediate layer, the inner layer selected from the group consisting of Nylon 11, Nylon 12, Nylon 6, an mixtures thereof,
- wherein the materials employed in the outer layer, inner layer and intermediate layers are thermoplastic when the layered tubing is in a use condition.
A layered tubing for conveying a vapor or liquid, the layered tubing comprising:
- an outer layer having an inner and an outer face, the outer layer consisting essentially fan extrudable polyamide;
- an intermediate layer consisting essentially of an extrudable non-polyamide thermoplastic capable of sufficiently permanent laminar adhesion to the polyamide outer layer and exhibiting at least some resistance to short-chain hydrocarbon molecule conveyed through the tubing, wherein the extrudable thermoplastic of the intermediate layer is a thermoplastic polyester selected from the group consisting of polybutylene terephthalate, polyethylene terephthlate and mixtures thereof, and
- an intermediate layer consisting essentially of an extrudable, melt processible polyamide capable of sufficiently permanent laminar adhesion with the intermediate layer selected from the group consisting of Nylon 11, Nylon 12, Nylon 6, and mixtures thereof;
- wherein the materials employed in the outer layer, inner layer and intermediate layer are thermoplastic when the tubing is in a use condition.
A layered tubing for conveying vapor or liquid, the layered tubing comprising:
- an inner fled-contacting layer, the inner layer composed of a melt-processible thermoplastic;
- an intermediate layer positioned radially outward of the inner fluid contacting layer and in contact therewith, the intermediate layer containing a melt-processible thermoplastic consisting essentially of a thermoplastic material which is chemically dissimilar to the melt-processible thermoplastic employed in the inner fluid-contacting layer;
- an outer layer positioned radially outward of the intermediate layer, the outer layer composed of a melt-processible thermoplastic consisting essentially of a thermoplastic which is chemically dissimilar to the melt-processible thermoplastic employed in the inner fluid contacting layer, the melt processible thermoplastic selected from the group consisting of polyantide, thermoplastic elastomers and mixtures thereof, and
- wherein the inner, intermediate and outer layers are in fixed positional relationship to each other and are composed of thermoplastic material when the layered tubing is in a use condition.
Dependencies are inferred from the claim text.