| 摘要 |
A method for cold-forming a sheet of stretched or unstretched thermoplastic synthetic resin to form a domed body by tightly clamping said sheet in edge portions, heating only the clamped portions above the freezing point of the resin, cooling the heated clamped portions slightly below the freezing point of the resin, releasing the clamping, and further cooling the edges to room temperature. Single-wall and double-wall domes useful as structural elements, e.g. skylights, can be formed by this method. |
