| 摘要 |
A vacuum forming apparatus 1 has a forming die 10, a plurality of holding devices 4, a pressing device 12 and a pair of supplemental holding devices 20. The forming die has at least one suction hole 11 for creating a vacuum. The holding devices hold a resin sheet J that has been softened by heating. The pressing device moves relative to the forming die to close a space between the device and the die and form an airtight state between them. Each of the supplemental holding devices includes a clamp member (21 figure 3) and a support member (22 figure 3). The supplemental holding devices are arranged to move toward each other to cause the sheet to sag. The clamp members clamp the resin sheet on two sides of a selected sag area (B figure 6) where the resin sheet will be made to sag. The support members extend along two side portions of the selected sag area and support a bottom surface of the resin sheet where the sheet will be made to sag. A later embodiment relates to a method of using said vacuum forming apparatus. |
