发明名称 |
Pneumatic thermoforming of plastic products involves additional heating of local areas with radiant heating source |
摘要 |
<p>A sheet or film(3) of thermoplastic material is clamped in a tool(1), heated and thermoformed using either positive or negative pressure. In selected areas(T) the plastic is additionally subjected to radiation(15) which increases the temperature before and/or during the thermoforming stage to control local stretching of the film or sheet. Radiation is provided by a laser beam(15), preferably a pulsed infra-red laser beam and more particularly a carbon dioxide laser(16). The beam is directed onto specified areas(T) of the plastic sheet(3) by a fast acting optical beam diverting system(19). Following container forming the beam may be employed to form a consolidated edge(B) to the container. Sensors(22) measure the sheet properties, in particular temperature and thickness, in the specific areas. An independent claim is included for the process equipment which includes a radiant heater(14) for localized heating of the film or sheet.</p> |
申请公布号 |
DE10349156(A1) |
申请公布日期 |
2005.06.16 |
申请号 |
DE2003149156 |
申请日期 |
2003.10.22 |
申请人 |
BLZ BAYERISCHES LASERZENTRUM GEMEINNUETZIGE FORSCHUNGSGESELLSCHAFT MBH;HITHERMA AG |
发明人 |
FRICK, THOMAS;SCHOELLHORN, MARCELLUS;HUBER, ERICH;SCHMIDT, MICHAEL;ESER, GERD |
分类号 |
B29C35/08;B29C51/42;B29C51/46;(IPC1-7):B29C51/10;B29C51/18 |
主分类号 |
B29C35/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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