| 摘要 |
PURPOSE:To improve yield by improving thermal efficiency by performing heating and vacuum molding of a resin sheet in a closed space and enabling uniform heating to be conducted, by a method wherein after the resin sheet is fixed by clamping a mold and vacuum molding is performed by heating the resin sheet, raw material resin is put into a cavity and foamed by blowing heating gas into the cavity. CONSTITUTION:It is preferable that an air gap 19 is provided on an outer circumferences of molding faces 8, 9 of a sheet side mold 2 and foam side mold 3 and a slidable moving frame 17 is provided on a side 19 of the molding face 9 of the mold 3. A plurality of small holes 11, 12 are provided into mold faces (molding faces) 8, 9. It is preferable that the small hole 12 of the mold face 9 is divided into blocks and made into a heating gas feed hole 12 and discharge hole 13. Mold clamping is formed and a sheet 1 is fixed. Then after heating steam is blown into the mold 3 through the small holes 11, 12 and the sheet 1 is softened, the sheet 1 is stuck to the mold face 8 by performing sucking. Then the moving frame 17 is slid, the cavity is formed, for example, prefoamed styrene beads are put into the cavity and foamed by blowing the steam into the cavity. |
