Fts Co., Ltd.

Toshiaki Asahara

Tomohide Aoki

Koji Sugiura

Yasuyuki Washiyama

Shinji Yukimaru

Kouji Ito

A blow molding device and method capable of forming a blow molded article having a built-in part with a good yield rate. The blow molding device has a die core, a blow mold, a parison holding unit and a built-in part holding unit. The parison holding unit has parison expanders and a parison outer holding plate. The built-in part holding unit has an airtight guide tube and a holding rod. After a lower end of a parison is expanded with a plurality of parison expanders, and an upper end of the airtight guide tube is inserted in the lower end of the parison, the lower end of the parison is held between the upper end of the airtight guide tube and the parison outer holding plate, and the pre-blowing is carried out. After the built-in part is positioned in an interior space of the parison, and the parison and built-in part are held between the slide cores, the blow mold is closed and blowing is carried out.

Blow molding device and blow molding method

A fuel tank capable of strongly fusion-bonding a built-in part to an inner surface of an outer wall thereof while protecting the outer wall even when an impact, etc. are applied thereto. In the fuel tank for a motor vehicle, which is formed by blow molding, in which the built-in part is mounted, and which has the outer wall composed of a synthetic resin, a plurality of mounting members adapted to mount the built-in part to the fuel tank are provided on the built-in part so as to be fusion-bonded to the inner surface of the outer wall of the fuel tank. An abutment portion is formed on each of the mounting members for contacting the inner surface of the outer wall of the fuel tank, and an abutment surface and a plurality of abutment pins, each projecting from the abutment surface, are formed in the abutment portion. The abutment pin is formed into a columnar or frustum-shaped configuration, each having a circular or elliptical cross-section, and a diameter or a main axis of a projecting end of the abutment pin along with the height of the abutment pin from the abutment surface are formed less than the thickness of the outer wall of the fuel tank.

Growing community of inventors

Aichi Prefecture, Japan

Toshiaki Asahara