发明名称 |
Method of making a rotatable molding element for selectively aperturing thermoplastic film |
摘要 |
An apparatus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable molding element means for receiving the film and which means has a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressure differential is applied to the surface of the film, a desired pattern of perforated areas and non-perforated areas are imparted to the film with each of said areas being continuous across the web of the film and alternating in the machine direction.
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申请公布号 |
US4644623(A) |
申请公布日期 |
1987.02.24 |
申请号 |
US19850721883 |
申请日期 |
1985.04.11 |
申请人 |
ETHYL CORPORATION |
发明人 |
RALEY, GARLAND E.;SPEAR, DEAN M. |
分类号 |
B26F1/26;B29C59/06;(IPC1-7):B21H1/18;B32B31/04 |
主分类号 |
B26F1/26 |
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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