Flynn, Thiel, Boutell & Tanis, P.C.
Blow molding method, blow molded product and blow molding mold
Blow-molding molds 10 and 20 having parison shutters 31 and 32 for preventing an inflation of the parison 3 toward the outside of the molds 10 and 20 are used in a blow-molding method of the present invention. In other words, a closed space for preventing the parison 3 from inflating out of the molds 10 and 20 are formed by the parison shutters 31 and 32 and a predetermined air is secured in the parison 3 in a frame clamping step (B). In the subsequent mold clamping step (C), the pressure inside the parison 3 starts to be increased when the molds 10 and 20 press the parison 3, so that the parison 3 can be continuously in contact with the die design surface 11. Accordingly, since the parison 3 can be uniformly contracted by cooling, molding failure such as streaks and uneven pattern transfer can be avoided, thus obtaining a blow-molded product having good appearance.
Idemitsu Petrochemical Co., Ltd. Toyota Shatai Kabushiki Kaisya
B B B B B B B B B B B
B29C B29C B29C B29C B29L B29C B29C B29C B29C B29C B29C
additional additional additional additional additional additional additional additional additional inventional inventional
Shoichi Katsuhiko Hirofumi Tomoyuki Sueki Shigekazu
Miura Tada Yamada Obara Sugawara Kumazaki