| 摘要 |
PURPOSE:To stably obtain a molded body of high quality at a high cycle in low steam consumption by detecting foaming pressure at the time of final heating by a digital surface pressure gauge to stop the supply of steam on the basis of the detected pressure at a required point within a set range. CONSTITUTION:After a mold is filled with raw material beads, heated steam is supplied to a jacket part from a medium (steam) supply pipe 4 and introduced into the mold from a steam introducing opening to heat the molding space of the mold to about 105-120 deg.C and the raw material beads are plasticized and further foamed to be mutually welded by internal pressure and formed into a integrated product. At this time, foaming pressure (mold pressure) is detected by a digital surface pressure gauge 2 and, when the detected pressure reaches the predetermined set value determined within a range of a set value of 0.60-1.00kg/cm<2>, the supply of steam is stopped and heating is controlled to obtain stable foaming pressure. When the raw material beads are foamed under heating and the integral welding thereof advances, the mold is preliminarily cooled according to a usual technique and a product is cooled by the supply of a cooling medium such as cooling water and, after the mold is reduced in pressure to remove drain, the product is demolded to be taken out. |
