发明授权
- 专利标题： Shaping glass sheets by drop forming with improved sag control
- 专利标题（中）： 通过下降成型形成玻璃板，改善下垂控制
-
申请号： US128335申请日： 1980-03-07
-
公开(公告)号： US4300935A公开(公告)日： 1981-11-17
- 发明人: Samuel L. Seymour
- 申请人： Samuel L. Seymour
- 申请人地址： PA Pittsburgh
- 专利权人： PPG Industries, Inc.
- 当前专利权人： PPG Industries, Inc.
- 当前专利权人地址： PA Pittsburgh
- 主分类号： C03B23/025
- IPC分类号： C03B23/025 ; C03B35/14 ; C03B35/20 ; C03B35/24
摘要：
When glass sheets are shaped by drop forming a glass sheet released from vacuum engagement against the bottom perforated plate of a vacuum platen to drop onto a shaping mold of ring-like construction, the intermediate portion of the glass sheet can develop excessive downward sag. The present invention discloses different techniques to develop an upward bow in the intermediate portion of the glass sheet sufficient to compensate approximately for the undesired excessive downward sag.
公开/授权文献
- US6148555A Cover for temporarily altering traffic signs 公开/授权日：2000-11-21
信息查询
