| 摘要 |
Blanks ( 12 ) of thermoplastic material are heated, and a thermoforming step is performed in which the heated blanks are deformed plastically by stretching. Before the thermoforming step, a die-punching step is performed in which the peripheral regions of the blanks are deformed by die-punching while the material of the blanks is held captive on the outside. The installation includes heater means ( 16 ) for heating said blanks, thermoforming means ( 24 ), and a die-punching tool ( 26, 28 ) suitable for deforming the peripheral regions of the blanks before they are thermoformed.
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