Membrane pack and method of making
US4576715A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1981 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Feb 13, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2001/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A membrane pack is constructed, which includes a highly porous carrier sandwiched between a pair of membrane structures that must be kept continuously wet, the pack having a hole and being sealed around the hole to prevent the passage of polluting liquid lying in the hole, into the porous carrier of the pack. The membrane pack is constructed by impregnating the carrier with a flowable polymer which can solidify, to leave a thin layer of the polymer on either surface of the carrier, and by then welding the polymer layers to membranes at either face of the carrier. Ultrasonic welding of the membrane structures to the carrier is performed while the membrane structures are wet, the ultrasonic welding dissipating moisture lying at the interface between the carrier and membrane structures to permit even hydrophilic polymers to be utilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.