Patent · US Expired

Filter apparatus for the uniform filtration of plastic melts

US4849103A · kind A · utility

15Cited by

8References

7Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Robert Schmidt · Eltville am Rhein, DE
Herbert Peiffer · Mainz, DE

Key dates

Filing date	May 18, 1987
Grant date	Jul 18, 1989
Priority date	—
Expiry date	May 18, 2007

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C48/694
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A filter apparatus is provided comprising a number of cylindrical candle filters, each of which contains a displacement body forming a space of uniform width between itself and the candle filter. The filter material of the candle filter is supported by a cylindrical supporting body which has passages through which a plastic melt to be filtered can flow. A number of filter apparatuses can be arranged on concentric circles on a cylindrical filter housing so as to minimize the dwelling time of the plastic melt flow through the filters and to minimize the pressure loss over the length of the filters.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.