Process for producing insulating paper where the paper is frictionally calendered
US3957573A · kind A · utility
22Cited by
14References
29Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 8, 1972 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Nov 8, 1992 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H5/202
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Polyolefin fibers containing at least 70% by weight of polypropylene fibers having a denier of at least 0.5 and a birefringence of at least 2.5 .times. 10.sup.-.sup.2 are formed into a sheet. The sheet is then frictionally calendered in the dry state at a frictional ratio of at least 15% and at a temperature in the range from 90.degree.C to 160.degree.C whereby an insulating paper having excellent air-impermeability and oil-resistance is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.