发明名称 |
VERFAHREN ZUM HERSTELLEN DUENNWANDIGER ARTIKEL AUS KRISTALLINEM THERMOPLASTISCHEM MATERIAL |
摘要 |
A method for manufacturing thin- walled articles, for example cups and plates, by thermoforming a sheet of crystalline thermoplastics material which has a critical crystalline melting temperature range. The method includes temperature conditioning the sheet for thermoforming, and the conditioning comprises developing a preliminary temperature profile across the sheet such that the core part of the sheet is at a temperature lower than the said range, the outer surface regions of the sheet being at a still lower temperature. A final temperature profile for thermoforming is developed by reheating the outer surface regions to a temperature such that those regions become at least elastically deformable, the core part being kept in an elastically deformable state at a temperature lower than the said range. |
申请公布号 |
DE2830740(A1) |
申请公布日期 |
1979.02.15 |
申请号 |
DE19782830740 |
申请日期 |
1978.07.13 |
申请人 |
BELLAPLAST GMBH |
发明人 |
W. THIEL,ALFONS;GEPPERT,BARBARA,ING. |
分类号 |
B29C45/00;B29C47/88;B29C51/00;B29C51/42 |
主分类号 |
B29C45/00 |
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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