Open capillary channel structures, improved process for making capillary channel structures, and extrusion die for use therein
US5200248A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1991 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Oct 8, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/298
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Capillary channel structures having one or more intrastructure capillary channels, said structures comprising a polymer composition, wherein: said structures have a capillary channel base, and at least two polymeric capillary channel walls extending from said base along the length of said base in the axial direction for at least about 0.2 cm, said walls having a base end and a distal end, wherein said base and walls form said capillary channels; and said structures have a Specific Capillary Volume of at least about 1.2 cc/g, a Specific Capillary Surface Area of at least about 500 cm.sup.2 /g, and a Compressive Strength (Dry) of at least about 13,800 dynes/cm.sup.2. The structures can be in the form of fibers or sheets. The fibers have a Specific Capillary Volume of at least about 2.0 cc/g and a Specific Capillary Surface Area of at least about 2000 cm.sup.2 /g. An improved process, and extrusion dies for use therein, wherein the extrusion die has an annular orifice with wall orifices extending radially therefrom, are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.