Plastic tube with varying layer thickness

A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant, wherein the thicknesses of said layers are varied in a first area to provide higher temperature resistance.

A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant, wherein said thicknesses of said layers are, varied in a first area to provide resistance to chemicals.

A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant, wherein said thicknesses of said layers are varied in a fourth area to provide optimal impermeability properties.

A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant, wherein said thicknesses of said layers are varied in a fifth area to provide higher fire resistance.

A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant, wherein said thicknesses are varied in a first area, a second area axially spaced from said first area, a third area axially spaced from said first area and said second area, wherein said thicknesses are varied in said first area to provide higher temperature resistance than in said second area and said third area, said thicknesses are varied in said second area to provide higher flexibility than in said first area and said third area, and said thicknesses are varied in said third area to provide higher resistance to chemicals than said first area and said second area.

A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant, wherein the number of said plurality of layers varies in said axial direction.

A plastic tube, especially for use in the construction of automotive vehicles, comprising:

• a plurality of layers each having a thickness;
• a first area axially spaced from a second area,
• a third area axially spaced from said first area and said second area, wherein said thicknesses are varied in said first area to provide higher temperature resistance than in said second area and said third area, said thicknesses are varied in said second area to provide higher flexibility than in said first area and said third area, and said thicknesses are varied in said third area to provide higher resistance to chemicals than said first area and said second area.

A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant, wherein said thicknesses are varied in a first area, a second area axially spaced from said first area, and a third area axially spaced from said first area and said second area, said layer thicknesses of said plurality layers varying in each of said first, second and third areas to provide different properties.

A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant, wherein said plurality of layers comprises at least three layers, each of said three layers varying in said axial direction, each of said three layers varying in thickness in a complementary manner in said axial direction to maintain constant total thickness.