| 摘要 |
PURPOSE:To obtain easily and reliably a hot molded product which is free from a defect of a blister and well-balanced, by a method wherein after the fringe part of a resin sheet has been clamped by a clamp of a molding machine, deaeration through vacuum drawing between both the resin sheets is begun about synchronously with starting of heating. CONSTITUTION:A vinyl chloride resin sheet (PVC sheet) 1 and PVC sheet 2 are put between a top and bottom pair of clamps 6, 7 for a hot molded film and fixed under a state where an air suction frame 3 of a rectangular cross section is interposed between the fringe parts of the sheets. Then after starting of deaeration operation through suction between both the PVC sheets 1, 2 through a suction hole 5 of the air suction frame 3, the same is heated by a top and bottom heaters 8, 9. Consequently, the PVC sheets 1, 2 becomes a state where they adhere closely to each other due to softening of them and a laminated material 10 is formed by performing hot fusion. Therefore, the laminated material 10 which is heated and under a softened state is set up onto a mold 12 of an air-pressure forming machine 11. Simultaneously with sending in of compressed air (a) through the upper part ventilation (b) is performed through the lower part, molding is performed at 4 development magnifications and then a molded product A which is free from a defect of a blister in a box-like state is obtained by performing cooling and demolding.
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