| 摘要 |
PURPOSE:To contrive prevention of generation of heat irregularity and creases at the time of molding, by a method wherein heating devices are provided respectively on the inside and outside of an airtight box, and a synthetic resin sheet is kept at a planar state by controlling air pressure in the airtight box while heating the synthetic resin sheet. CONSTITUTION:A synthetic resin sheet 21 is clamped by a frame clamp device 11, an outer frame 12 of the clamp device 11 is brought into contact in an airtight state with an airtight box 51 the inside of which is provided with an inner heating device 31, and an outer heating device 41 is arranged on the outside of the clamp device 11 through a relative displacement. The title method is constituted so that a planar state is kept on by controlling air pressure within the airtight box 51 by a positive pressure pump 71, and preventing generation of slackening on a synthetic resin sheet 21 through varying air pressure while heating the synthetic resin sheet 21 with the inner and outer heating devices 31, 41. As a product obtained through vacuum air-pressure press molding is hard to generate creases, generation rate of defective goods is reduced, and a quality of the product can be improved by heating evenly.
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