Method for manufacturing a storage tank comprising an inner liner, an outer filament winding and a connecting part. The method comprises the steps of: blow molding the inner liner by extruding a parison, pinching the inner liner at least at one extremity to create a pinch and then blowing the pariso
Method for manufacturing a storage tank comprising an inner liner, an outer filament winding and a connecting part. The method comprises the steps of: blow molding the inner liner by extruding a parison, pinching the inner liner at least at one extremity to create a pinch and then blowing the parison; providing the connecting part with a slot of appropriate shape and size to receive a part of the pinch; inserting the part of the pinch in the slot so as to secure the inner liner and the connecting part; and applying the outer filament winding around the liner and the connecting part.
대표청구항▼
1. A method for manufacturing a storage tank, the storage tank comprising an inner liner comprising a shaped pinch, a connecting part having a slot corresponding to the shape of the pinch, and an outer filament winding; the method comprising:placing an extruded parison between two halves of a mold,c
1. A method for manufacturing a storage tank, the storage tank comprising an inner liner comprising a shaped pinch, a connecting part having a slot corresponding to the shape of the pinch, and an outer filament winding; the method comprising:placing an extruded parison between two halves of a mold,closing the two halves of the mold thereby compressing the parison at least at one extremity to create a shaped pinch conforming to an internal surface of the two mold halves, wherein the shaped pinch is obtained from the compression of the parison before the parison is blown;blowing the parison to conform to the inner surface of the mold to obtain the inner liner;providing the connecting part with a slot of appropriate shape and size to receive a part of the shaped pinch;inserting the part of the pinch in the slot of the connecting part,securing the inner liner and the connecting part to obtain an assembly of the inner liner and connecting part; andapplying the outer filament winding around the assembly of the inner liner and the connecting part to obtain the storage tank. 2. The method according to claim 1, further comprising: pinching the parison around a blowing needle placed between the two mold halves to seal the parison to the blowing needle. 3. The method according to claim 2, wherein the internal surface of the closed mold halves is a cylindrical housing having an extension at the shaped pinched extremity. 4. The method according to claim 3, wherein the blowing needle is inserted and sealed in a bottom of the cylindrical housing mold and the pinch is formed in a top of the cylindrical housing mold so that the internal part of the mold is sealed during the blow molding of the inner liner. 5. The method according to claim 3, further comprising opening the extension, wherein the connecting part comprises an extension of tubular shape matching the opening of the extension of the housing and the assembly comprises a communication opening from an inner chamber of the storage tank to an exterior. 6. The method according to claim 1, wherein the shape of the shaped pinch is one selected from the group consisting of an inverted cone, a T-shape boss, a stud and a snap fit shape and the slot of the connecting part has a shape that corresponds to the shape of the shaped pinch. 7. The method according to claim 1, wherein the inner liner comprises: at least one structural layer and at least one barrier layer. 8. The method according to claim 7, wherein the inner liner further comprises an adhesive layer which is between the structural layer and the barrier layer. 9. The method according to claim 7, wherein the structural layer comprises polyethylene (PE) or polyamide (PA). 10. The method according to claim 7, wherein the barrier layer comprises ethylene vinyl alcohol copolymer (EVOH). 11. The method according to claim 1, further comprising placing an elastomeric seal between the inner liner and the connecting part. 12. The method according to claim 11, further comprising machining a groove into the connecting part to accommodate the elastomeric seal. 13. The method according to claim 12 wherein the elastic seal is an O-ring. 14. The method according to claim 7, wherein the inner liner comprises two structural layers and one barrier layer and the barrier layer is sandwiched between the structural layers. 15. The method according to claim 14, wherein the barrier layer comprises an ethylene vinyl alcohol copolymer and a thickness of the barrier layer is less than 500 μm. 16. The method according to claim 1, wherein the outer filament winding comprises a carbon fiber filament composite. 17. The method according to claim 16, further comprising winding a layer of impact resistant material over the outer filament. 18. The method according to claim 17, wherein the layer of wound filament and the layer of impact resistant material are not connected and can expand or contract at different rates.
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