| 摘要 |
PROBLEM TO BE SOLVED: To realize the uniform and forced cooling of a blow-molding in a short period of time by a method wherein the external surface of the hollow molding in a mold is cooled by the refrigerant circulating within the mold and, at the same time, the internal surface of the hollow molding is cooled by a predetermined amount or less of mist. SOLUTION: Blow-molding is performed by blasting air from the air feeding and delivering part 14 of a mist feeding part 10 in a parison housed in the cavity of a mold 11. At the forming of a hollow molding, under the condition that air is blasted in the parison, mist is jetted from the tip of a mist nozzle 13 so as to bring the mist into direct contact with the internal surface of the parison in order to quench the internal. surface of the parison by the action of the latent heat of evaporation of steam. After the quenching, the jetting is stopped. At this time, the size of the mist is set to be 200μm or less, preferably 10μm or less. Next, the feeding and delivering of air is performed under the state that the blasting pressure of air is kept so as to circulate the air within the hollow molding A in order to further uniformity cool the internal surface of the hollow molding A with the air. |
