초록 ▼

A polymeric, multiple-layer tube suitable for use as a filler neck is disclosed. The tube is comprised of a generally cylindrical wall having an outer surface and an inner surface. The inner surface is approximately parallel to the outer surface and defines a generally cylindrical interior having a

A polymeric, multiple-layer tube suitable for use as a filler neck is disclosed. The tube is comprised of a generally cylindrical wall having an outer surface and an inner surface. The inner surface is approximately parallel to the outer surface and defines a generally cylindrical interior having a diameter D. The cylindrical interior, which provides a flow path for fuel, extends throughout the length of the tube. The tube is divided into one or more contiguous first and second longitudinal segments. In the first longitudinal segment, D is approximately constant along the length of the segment; in the second longitudinal segment, D varies with axial position. This variation defines a convolution, which allows the filler tube to be bent without crimping. The cylindrical wall of the multiple-layer tube further comprises an outer layer composed of a thermoplastic elastomer, and an inner layer composed of an extrudable melt-processible thermoplastic having an elongation of at least 150%. Though in contact, the two layers are not bonded together. When compounded with suitable additives, the filler neck tube exhibits good abrasion resistance, is nearly impermeable to hydrocarbons present in fuel, and is less susceptible to electrostatic discharge.

대표청구항 ▼

[ What is claimed is:] [1.] A tube suitable for use as a filler neck comprising:a generally cylindrical wall having an outer surface and an inner surface, the inner surface approximately parallel to the outer surface and defining a generally cylindrical interior having a diameter D, the cylindrical

[ What is claimed is:] [1.] A tube suitable for use as a filler neck comprising:a generally cylindrical wall having an outer surface and an inner surface, the inner surface approximately parallel to the outer surface and defining a generally cylindrical interior having a diameter D, the cylindrical interior extending longitudinally through the tube coaxial to a longitudinal axis;a first longitudinal segment in which D is approximately constant along the longitudinal axis; anda second longitudinal segment in which D varies with position along the longitudinal axis, the variation of D defining a convolution for facilitating bending of the filler tube, the cylindrical wall of the multiple-layer tube further comprising:an outer layer comprised of a thermoplastic elastomer; andan inner layer comprised of an extrudable melt-processible thermoplastic having an elongation of at least 150%;wherein the outer layer and the inner layer are in non-adhesive contact.