Fluid transfer multi-layer tube based on a polyamide and an ethyl vinyl alcohol or polyvinyl alcohol
AssigneeArkema Inc.
InventorsMehdi M. Emad, Franck Bertoux, Gregory S. O'Brien
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Abstract
The present invention relates to a symmetrical multi-layer tube based on polyamide and ethyl vinyl alcohol (EVOH) or polyvinyl alcohol (PVOH) for transferring fluids. As examples of tubes for transferring fluids, mention may be made of fuel (gasoline, diesel fuel) pipes, in particular for carrying fuel from the tank to the engine of motor vehicles. Other examples of fluid transfer include, but are not limited to, the fluids used in fuel cells, CO2 systems for cooling, hydraulic systems, cooling circuits and air-conditioning circuits, and medium-pressure power transfer.
Claims6
A symmetrical multi-layer tube comprising, in its radial direction from the outside inwards:
- a) a polyamide outer layer (1);
- b) an adhesive layer (2);
- c) an ethyl vinyl alcohol and/or polyvinyl alcohol layer (3);
- d) an adhesive layer (4);
- and
- e) a polyamide inner layer (5),
- wherein said inner and outer polyamide layers have essentially the same thickness and essentially the same composition;
- wherein said adhesive layers (2) and (4) have essentially the same thickness and essentially the same composition, and wherein the layers being successive and adhering to one another in their respective contact region.
Dependencies are inferred from the claim text.