发明名称 |
VERFAHREN ZUR HERSTELLUNG EINES VERPACKUNGSBANDES |
摘要 |
PET(polyethylene terephthalate), preferably scrap material, is extruded by a twin screw extruder(4) while being degassed. Melt pressure is measured in front of and behind a filter screen(11) at the output end of the extruder. Dependent on the measured pressures the metering of PET material into the extruder and/or the extruder speed are varied. Molten plastic enters a spinning head(13) following the filter screen and emerge in the form of a band which is subsequently cooled and stretched. The PET material is fed to the extruder by a metering screw(3) which under feeds the twin extruder screws so that they are only 25-60%, preferably 30-50% full. Both screws rotate in the same direction. Degassing is effected by a pump. PET melt is fed to the spinning head(13) by a melt pump(12). Band emerging from the spinning head is cooled in a water bath. |
申请公布号 |
AT359904(T) |
申请公布日期 |
2007.05.15 |
申请号 |
AT20030001687T |
申请日期 |
2003.01.25 |
申请人 |
MOTECH GMBH TECHNOLOGY & SYSTEMS |
发明人 |
MORTON-FINGER, JUERGEN, DIPL.-ING. |
分类号 |
B29C47/10;B29C47/40;B29C47/68;B29C47/76;B29C47/92;(IPC1-7):B29C47/10 |
主分类号 |
B29C47/10 |
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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