MULTIPLE LAYER MOTOR VEHICLE HOSE LINE

Abstract

Multi-layer motor vehicle tube for conducting at least one fluid medium, in particular for conducting of motor fuels, wherein the tube comprises at least five layers, The tube features the following layer structure, from outside to inside: an outside layer made of at least one polyamide, a first adhesion-promoting layer, a barrier layer with barrier properties, a second adhesion-promoting layer, an inside layer made of at least one thermoplastic polyurethane (TPU) and/or at least one partly aromatic polyamide (PPA). The total layer thickness of the tube amounts to 0.7 to 3 mm.

Claims

1. Multi-layer motor vehicle tube for conducting at least one fluid medium, wherein the tube features at least five layers and specifically with the following layer structure, from outside to inside: an outer layer made substantially of at least one polyamide, a first adhesive layer, a barrier layer with barrier properties against at least one component of the fluid medium, a second adhesive layer, and an inside layer made substantially of at least one thermoplastic polyurethane (TPU) and/or at least one partly aromatic polyamide (PPA), wherein the total layer thickness of the tube amounts to 0.7 to 3 mm, and wherein the thickness of the first adhesive layer and/or the thickness of the second adhesive layer is less than the thickness of the barrier layer.

2. Multi-layer motor vehicle tube according to claim 1, wherein the outside layer substantially consists of polyamide 12 and/or of polyamide 6.12.

3. Multi-layer motor vehicle tube according to claim 1, wherein the thickness of the outside layer amounts to 5 to 50%, of the total layer thickness of the tube.

4. Multi-layer motor vehicle tube according to claim 1, wherein the first adhesive layer is an adhesive layer based on at least one polyamide and/or based on at least one polyolefin.

5. Multi-layer motor vehicle tube according to claim 1, wherein the first adhesive layer is an adhesive layer based on polyamide 6.12 and/or based on polypropylene.

6. Multi-layer motor vehicle tube according to claim 1, wherein the thickness of the first adhesive layer amounts to 3 to 30% of the total layer thickness of the tube.

7. Multi-layer motor vehicle tube according to claim 1, wherein the barrier layer is a barrier layer based on at least one component from the group EVOH, fluoropolymer.

8. Multi-layer motor vehicle tube according to claim 1, wherein the thickness of the barrier layer amounts to 5 to 50% of the total layer thickness of the tube.

9. Multi-layer motor vehicle tube according to one of claims 1 to 8, wherein the barrier layer features barrier properties against at least one component of a motor fuel conducted through the tube.

10. Multi-layer motor vehicle tube according to claim 1, wherein the second adhesive layer is an adhesive layer based on at least one polyamide and/or based on at least one polyolefin.

11. Multi-layer motor vehicle tube according to claim 1, wherein the second adhesive layer is an adhesive layer based on polyamide 6.12 and/or based on polypropylene.

12. Multi-layer motor vehicle tube according to claim 1, wherein the thickness of the second adhesive layer amounts to 3 to 30% of the total layer thickness of the tube.

13. Multi-layer motor vehicle tube according to claim 1, wherein the thickness of the inside layer amounts to 5 to 50% of the total layer thickness of the tube.

14. Multi-layer motor vehicle tube according to claim 1, wherein the inside layer is the innermost layer of the tube and comes into contact with the fluid media flowing through the tube and/or fuel flowing through the tube.

15. Multi-layer motor vehicle tube according to claim 1, wherein the inside layer is provided with conductive additives.

16. Multi-layer motor vehicle tube according to claim 1, wherein the tube is produced by coextrusion.

17. Multi-layer motor vehicle tube according to claim 1, wherein the total layer thickness of the tube amounts to 0.7 to 2.5 mm.

18. Multi-layer motor vehicle tube according to claim 1, wherein the total layer thickness of the tube amounts to 0.8 to 2 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The disclosure will be explained in greater detail below with reference to one exemplary embodiment depicted in the figures. The schematic depictions represent:

[0025] FIG. 1 a perspective view of a tube according to the disclosure, and

[0026] FIG. 2a cross section through the object according to FIG. 1.

DETAILED DESCRIPTION

[0027] The figures depict one multiple-layer motor vehicle tube (1) according to the disclosure, wherein the exemplary embodiment pertains to a motor fuel tube for conducting of motor fuels. The tube 1 features an outside layer 2, which in the exemplary embodiment consists of polyamide 12 or substantially of polyamide 12. This outside layer 2 may feature a layer thickness between 0.2 and 0.4 mm. Expedientlyand as in the exemplary embodimenta first adhesion-promoting layer 3 is disposed on the inside of the outside layer 2. Preferablyand as in the exemplary embodimentthis adhesion-promoting layer 3 is one based on a modified polyamide 6.12. The layer thickness of the first adhesion-promoting layer 3 in the exemplary embodiment may amount to 0.03 to 0.1 mm.

[0028] It remains within the scope of the disclosure that on the inside of the first adhesion-promoting layer 3 there is a barrier layer 4 directly adjoining thereon; in the exemplary embodiment it consists of EVOH or substantially thereof. The thickness of barrier layer 4 expediently amounts to 0.1 to 0.3 mm. As has proven positiveand as in the exemplary embodimenta second adhesion-promoting layer 5 is disposed on the inside of the outside layer 4. Preferablyand as in the exemplary embodimentthis adhesion-promoting layer 5 is one based on a modified polyamide 6.12. It is recommended that the layer thickness of the second adhesion-promoting layer 5 is 0.03 to 0.1 mm.

[0029] According to one preferred embodimentand as in the design example according to the figuresdirectly adjoining the inside of the second adhesion-promoting layer 5 there is an inner layer 6, which according to one design variant and as in the exemplary embodiment, consists of a thermoplastic polyurethane (TPU) or substantially thereof. The layer thickness of the inside layer in the exemplary embodiment may amount to 0.1 to 0.4 mm. It remains within the scope of the disclosure that the inside layer 6 can be provided with conductive additives.Expediently the total layer thickness of the tube amounts to 0.7 to 3 mm, preferably 0.7 to 2.5 mm.