Filter exchange device for an extrusion molding machine
US4880374A · kind A · utility
6Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | May 20, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/693
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter exchange device in a molten resin passage in an extrusion molding machine, which includes at least one filter casing for airtightly enclosing a spare filter and having port means for exhausting air out of the filter casing and filling the interior thereof with a gas inactive to molten resin. Fish eyes contained in the molded product after filter exchange reduced in number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.