Method for manufacturing shaped articles by injection-blow molding
AssigneesShowa Denko K.K., Nissei Plastic Industrial Co., Ltd.
InventorsWasuke Sato, Fumio Iriko, Yoshihiko Yuzawa, Setsuyuki Takeuchi, Nobukuni Ibe
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Abstract
A method for manufacturing shaped articles by injection-blow molding. A thermoplastic material is first formed into a bottomed parison by injection-molding said material onto the surface of an injection molding core. The bottomed parison formed on the surface of the core is cooled to a temperature at which it is easily removed from the core, and is removed therefrom. The parison is heated again to a predetermined temperature and the reheated parison is transferred to a blow molding mold, wherein the parison is blow-molded.
Claims3
A method for manufacturing shaped articles by injection blow molding comprising injection-molding a thermo-plastic material onto the surface of an injection molding core to form a bottomed parison;
- cooling the parison to a temperature at which it is easily removed from said core;
- removing the cooled parison from said core and transferring the cooled parison to a reheating mold;
- reheating the removed parison to a predetermined temperature;
- transferring the reheated parison to a blow molding mold;
- stretching longitudinally the reheated parison disposed within the blow-molding mold by extending a stretching rod downwards within the parison;
- and blow-molding said parison;
- characterized in that said reheating is performed in a manner that the stretching rod is disposed in contact with the inside bottom of the parison, so that the stretching rod is heated to much the same temperature as the parison and so that in the stretching step, the parison portion contacted with the stretching rod is prevented from being destroyed.
Dependencies are inferred from the claim text.