Method of molding a fuel tank having baffle plates
AssigneeMitsui Petrochemical Industries, Ltd.
InventorSadamu Hirakawa
Life of this patent
Estimating the term…
Abstract
A method of molding a fuel tank wherein two baffle plates mounted on a blow-in are inserted in a molten parison of a thermoplastic resin surrounded by a split metal mold. The split metal mold is closed around the parison and a pressurized fluid is fed through the blow-in into the molten parison to blow-mold the fuel tank. The baffle plates, during the blow-molding, are melt-adhered onto the inner wall of the fuel tank. A blow-molded fuel tank containing two baffle plates adhered to the inner wall of the fuel tank is obtained.
Claims7
A method of blow-molding a fuel tank comprising the steps of:
- providing pre-molded baffle plates having a hollow tubular portion including an inner surface and plate portions extending outwardly from said tubular portion and the inner surface of said tubular portion having protuberances, and
- providing a blow-pin having a tip and an outer surface including a plurality of grooves in said outer surface extending downwardly from said tip,
- mounting a plurality of said pre-molded baffle plates on said blow-pin by having the protuberances on the baffle plates engage the grooves in the blow-pin;
- inserting said blow-pin with the baffle plates in a molten parison of a thermoplastic resin;
- and
- closing a split metal mold from outside of the molten parison at the time of feeding a pressurized fluid into the mold via the blow-pin so that the baffle plates melt-adhere onto an inner surface of the fuel tank to be molded.
A method for blow-molding the main body of a fuel tank containing baffle plates which comprises the steps of:
- providing pre-molded baffle plates having a hollow tubular portion including an inner surface and plate portions extending outwardly from said tubular portion and the inner surface of said tubular portion having protuberances, and
- providing a blow-pin having a tip and an outer surface including a plurality of grooves in said outer surface of alternating different lengths relative to each other extending downwardly from said tip,
- mounting a plurality of said pre-molded baffle plates on said blow-pin by having the protuberances on the baffle plates engage the grooves in the blow-pin,
- inserting said blow-pin with the baffle plates mounted thereon into a molten parison of a thermoplastic resin which is surrounded by a split fuel tank metal mold, having an opening for the blow-pin,
- closing the split mold,
- feeding a pressurized fluid through the blow-pin into the molten parison to blow-mold the molten parison and to melt-adhere the end portions of the baffle plates onto the inner surface of the fuel tank.
Dependencies are inferred from the claim text.