To produce a fuel tank excellent not only in mechanical capacity and lightweight properties but also in fuel impermeability with high moldability (the enhancement of the degree of freedom of a design and wall thickness uniformity, the shortening of a molding cycle and the reduction of a recycling ratio in a process).
At the time of injection molding of two divided objects of a fuel tank, as an injection mold used in injection molding, a pair of molds wherein the male and female molds molding the divided objects respectively are provided to one mold and the female and male molds respectively opposed to the male and female molds are provided to the other mold are used and a molten resin is injected in the cavities formed between the mutually opposed male and female molds to mold the respective divided objects and, subsequently, one mold is slid to register the respective molds in such a state that the divided objects left in the respective female molds are opposed to each other to mutually abut the respective divided objects and a molten resin is injected to the peripheral edge of the registered surface to mutually weld and bond two divided objects to mold a fuel tank.
YAMAGUCHI KO
YAMAZAKI MASAYUKI
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