MULTI-LAYERED MOTOR VEHICLE TUBE

Abstract

Multilayered motor vehicle tube, wherein the tube has at least five layers with the following layer structure from the outside to the inside: An outer layer made of at least one polymer from the group polyamide, polyolefin, a first carrier layer made of polyamide, a barrier layer made of at least one component from the group ethylene vinyl alcohol copolymer (EVOH), fluoropolymer, a second carrier layer made of polyamide, an inner layer made of a thermoplastic polyurethane (TPU).

The total layer thickness of the tube is 0.7 to 2 mm.

Claims

1. Multilayered motor vehicle tube for conducting fuels, wherein the tube has at least five layers with the following layer structure from outside to inside: an outer layer made of at least one polymer from the group polyamide, polyolefin, a first carrier layer made of polyamide, a barrier layer made of at least one component from the group ethylene vinyl alcohol copolymer (EVOH), fluoropolymer, a second carrier layer made of polyamide, and an inner layer made of a thermoplastic polyurethane (TPU), wherein the total layer thickness of the tube is 0.7 to 2.5 mm.

2. Tube according to claim 1, wherein the outer layer consists substantially of polyamide 12.

3. Tube according to claim 1, wherein the outer layer substantially consists of HDPE.

4. Tube according to claim 1, wherein the thickness of the outer layer is 5% to 60%, preferably 7% to 45% of the total wall thickness of the tube.

5. Tube according to claim 1, wherein at least one adhesion promoting is interposed between the outer layer and the first carrier layer.

6. Tube according to claim 5, wherein the thickness of the adhesion promoting layer is 3% to 30% of the total wall thickness of the tube.

7. Tube according to claim 1, wherein the first carrier layer consists substantially of polyamide 6.

8. Tube according to claim 1, wherein the first carrier layer substantially consists of at least one polyamide from the group polyamide 612, polyamide 12, polyamide 10, polyamide 11, co-polyamide 6/6.6, co-polyamide 6/12.

9. Tube according to claim 1, wherein the thickness of the first carrier layer is 5% to 70% of the total wall thickness of the tube.

10. Tube according to claim 1, wherein the thickness of the barrier layer is 5% to 50% of the total wall thickness of the tube.

11. Tube according to claim 1, wherein the second carrier layer consists substantially of polyamide 6.

12. Tube according to claim 1, wherein the second carrier layer substantially consists of at least one polyamide from the group polyamide 612, polyamide 12, polyamide 10, polyamide 11, co-polyamide 6/6.6, co-polyamide 6/12.

13. Tube according to claim 1, wherein the thickness of the second carrier layer is 5% to 70% of the total wall thickness of the tube.

14. Tube according to claim 1, wherein the thickness of the inner layer is 5% to 55%, particularly 7% to 50% of the total wall thickness of the tube.

15. Tube according to claim 1, wherein the first carrier layer and/or the second carrier layer has/have a greater thickness than the barrier layer.

16. Tube according to claim 1, wherein the first carrier layer and/or the second carrier layer has/have a greater thickness than the inner layer.

17. Tube according to claim 1, wherein the thickness of the outer layer has a greater thickness than the barrier layer.

18. Tube according to claim 1, wherein the total layer thickness of the tube is 0.8 to 2 mm.

19. Tube according to claim 1, wherein the total layer thickness of the tube is 0.85 to 1.8 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In the following, the disclosure shall be explained in more detail using a drawing showing only one embodiment. It is shown schematically in:

[0026] FIG. 1 a perspective view of a tube according to the disclosure, and

[0027] FIG. 2 a cutaway view of the subject matter according to FIG. 1.

DETAILED DESCRIPTION

[0028] In the embodiment according to the drawings, the tube 1 according to the disclosure has an outer layer 2 which consists of polyamide 12 or substantially of polyamide 12 and preferably has a layer thickness between 0.2 and 0.4 mm. This outer layer 2 is followed on the inner side by an adhesion promoting layer 3 which preferably and in the embodiment consists of polyamide 612 modified with maleic acid anhydride. This is followed on the inner side by the first carrier layer 4 which preferably and in the embodiment consists of polyamide 6 or substantially of polyamide 6 and expediently has a layer thickness between 0.2 and 0.75 mm. On the inner side, this first carrier layer 4 is followed by the barrier layer 5 which preferably and in the embodiment consists of EVOH or substantially of EVOH and preferably has a layer thickness between 0.1 and 0.3 mm. This barrier layer 5 is followed on the inner side by the second carrier layer 6 which consists of polyamide 6 or substantially of polyamide 6 and preferably has a layer thickness between 0.2 and 0.75 mm. On the inner side, the second carrier layer 6 is followed by the inner layer 7 which consists of TPU or substantially of TPU and preferably has a layer thickness between 0.1 and 0.4 mm. The motor vehicle tube 1 shown in the drawings was produced by means of coextrusion. It lies within the scope of the disclosure that the inner layer 7 can be provided with conductivity additives.