| 摘要 |
PROBLEM TO BE SOLVED: To produce a mold having a good mirror surface or embossed surface on the outer surface thereof and having a foamed layer therein by short cycle blow molding by foaming a foaming component to pressurize a parison from the hollow inferior thereof and closely bonding the outer surface of the parison to a molding surface under specific pressure and subsequently cooling the molding surface to specific temp. SOLUTION: A parison P is suspended between molding surfaces 30, 30 and, after the hollow part of the parison P is hermetically closed, air is supplied from an air supply source 90 to press the outer surface of the parison P to the molding surfaces under pressure of 100[kg/cm<2> ] or less to closely bond the same to the molding surfaces. At the same time, a foaming component P1 is supplied and, further, heated steam is injected to the space B on the rear side of the molding surfaces from a nozzle 70. By this constitution, the foaming component P1 in the hollow part of the parison is foamed to expand throughout the hollow part of the parison. Next, the heating steam in the space B is discharged to expand troughout the hollow part of the parison P. Next, the heating steam in the space B is discharged and cooling water + cooling air is injected into the space B through the nozzle 70. By this constitution, the prison P is rapidly cooled to (Vicat softening temp. -10 deg.C) or lower. |
