| 摘要 |
PURPOSE:To improve the pliability, flexing properties, and cushioning properties, by compressing a rigid synthetic resin foamed body under a temperature at or below its softening point and a high compression rate, and thereafter stopping the compression so as to allow it to be restored spontaneously. CONSTITUTION:First, a rigid synthetic resin foamed body (preferably of a polystyrene foamed at a high forming rate of 20-50) is compressed at a temperature <= its softening point until the length thereof in the direction of the compression becomes 60%, preferably, 40% <= the original length, and after stopping the compression, the foamed body is allowed to stand under atmospheric pressure to be restored spontaneously. It is preferable that the compression is gradually performed at a compression speed of 1-50mm.. |
