Method for sealing spiral wound filtration modules
US6068771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C53/562
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for preparing a spiral wound filtration module is provided. The module has a central permeate carrier tube. The method includes winding at least one filtration leaf about the permeate carrier tube. The filtration leaf includes a first membrane sheet, a permeate carrier sheet, and a second membrane sheet. The winding step creates an end face extending radially outwardly from the permeate tube on each end thereof. After winding, the filtration module is maintained in a wound state. An adhesive is then supplied to each end face and a vacuum is applied through each of the permeate tube. While the vacuum is applied, the permeate tube and filtration leaf assembly are spun in a centrifuge until the adhesive has solidified. After spinning, each end face of the module is severed at a distance between the level of adhesive along the feed spacer screen and the level of adhesive along the permeate carrier sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.