Depth filter sheet material and method for manufacturing same
US8181793B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2009 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Aug 31, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/05
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a method for manufacturing a depth filter sheet material, the method comprising preparing a flowable aqueous pulp composition comprising a fibrous material and a binding agent; dispensing the flowable aqueous pulp composition onto a water permeable support in a predetermined amount per unit area; at least partially draining the water content of the aqueous pulp composition through said water permeable support; drying the at least partially drained pulp composition at an elevated temperature to form a depth filter sheet raw material comprising a first and a second surface section forming an upper and a lower surface of the sheet raw material, respectively, and an intermediate section positioned in between and integrally formed with the first and the second surface sections, the intermediate section having a permeability greater than the permeability of the first and second surface sections; and removing or displacing at least portions of one of the first or second surface section of the raw material. Depth filter sheet materials obtained by the method are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.