| 摘要 |
PURPOSE:To deep-draw foam sheet in uniform thickness without break by a method wherein the thermoplastic resin foam sheet is temporarily formed at nearly ordinary temperature and heated up to its plastic deformation temperature while being kept under said temporarily formed state and then cooled. CONSTITUTION:Temporarily forming is performed by pinching thermoplastic resin foam sheet 1 at ordinary temperature between a bottom force 2 and a top force 3 and holding horizontally. The foam sheet 1 is temporarily shaped by pressing said top and bottom forces 2 and 3. Next, the heat forming is performed by heating the foam sheet 1 as is pressed by the temporarily forming forces 2 and 3 up to its plastic deformation temperature in order to shape the foam sheet 1. After that, the foam sheet 1 is cooled in order to obtain a form. Thus, the foam sheet can be deep-drawn in uniform thickness and at the same time without break. |
