发明名称 |
Menetelmä ja laitteisto muovikalvon valmistamiseksi ja muovikalvo |
摘要 |
A method and an apparatus for making a plastic film, and to a plastic film wherein the method includes extruding a film from plastic material by an extruder and orientating the film after extrusion. Material is mixed into the plastic so that when the plastic film is stretched, cavitation bubbles are formed in the material particles mixed into the plastic. After orientation, gas is arranged to act on the plastic film under high pressure so that the gas diffuses in the cavitation bubbles and causes overpressure in them. Thus it is possible to make a thin foamed film with a foaming degree of over 70%. |
申请公布号 |
FI107035(B) |
申请公布日期 |
2001.05.31 |
申请号 |
FI19990001934 |
申请日期 |
1999.09.10 |
申请人 |
NATURAL COLOUR KARI KIRJAVAINEN OY, |
发明人 |
KIRJAVAINEN,KARI |
分类号 |
B29C55/02;B29C44/20;B29C55/00;B29C55/14;B29C67/20;B29K105/04;B29L7/00 |
主分类号 |
B29C55/02 |
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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