Continuous polymer melt filtration
US6117338A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1999 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Mar 25, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus for continuously filtering molten polymer comprising: an arbor seated in a fixed support, the arbor having inlet and outlet ports for respectively receiving contaminated and discharging filtered melt, the ports communicating with openings in a pair of housings rotatably mounted on the arbor; a plurality of filter pod assemblies outwardly of and mounted on the rotatable housings, each assembly having a filter for contaminated melt and intake and discharge openings intermittently alignable with the ports on rotation of the housings to position a clean filter in the path of the contaminated melt and to remove the filter from the path when blocked with contaminants; passages associated with the inlet and outlet ports of the arbor and the housings for gradually establishing a flow of melt into a clean filter as it is rotated into filtering position; and thermally dilatable seal between the rotatable housings and the arbor to seal the housings and the arbor during the filtering of contaminated melt by a filter element of a filter pod assembly and to establish a clearance between the housings and arbor as a result of thermal expansion of the thermally dilatable seal to allow rot…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.