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1. WO2007090831 - PROCESS FOR MANUFACTURING A FUEL TANK AND TOOL FOR ITS IMPLEMENTATION

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]
CLAIMS

1. Process for manufacturing a plastic fuel tank, the tank being provided with at least one accessory connected to the internal space of the tank via at least one orifice in the wall of this tank, said process comprising the steps consisting in:

- supplying a flexible film and placing it on the tank so as to cover the interface between the tank and the accessory; and

- welding the film over its entire peripheral area to the wall of the tank;

characterized in that, before the film is welded to the wall of the tank, a vacuum is created between the flexible film and the wall of the tank using a vacuum tool having:

- a suction chamber comprising an opening directed towards both the flexible film and the support, the opening in the suction chamber being peripheral and formed in such a way as to rest over the edge of the flexible film over its entire periphery; and

- at least one suction channel for sucking out the air from the suction chamber.

2. Process according to the preceding claim, characterized in that the vacuum lies within a range from -800 to -60 mbar.

3. Process according to either of the preceding claims, characterized in that the welding takes place by laser radiation and in that, after and/or before welding, pressure is exerted on the weld region.

4. Process according to the preceding claim, characterized in that the pressure exerted lies within a range from 6 to 18 bar.

5. Process according to any one of the preceding claims, characterized in that the flexible film has a multilayer structure comprising at least one fuel barrier layer.

6. Process according to any one of the preceding claims, characterized in that the vacuum tool comprises, at the opening in the suction chamber, a peripheral seal, a first portion of which is intended to bear on the flexible film and a second portion of which is intended to bear on the support, the suction chamber being placed between the first portion and the second portion.

7. Process according to the preceding claim, characterized in that the peripheral seal is a lipped seal and is arranged so as to form an enlarged suction chamber close to the opening in the suction chamber.

8. Process according to any one of the preceding claims, characterized by the use of at least one pressure device placed so as to exert pressure on the film, in the weld zone, before and/or after welding.

9. Process according to the preceding claim, characterized in that the pressure device includes a pressure regulator.