Calendering method and a calender that makes use of the method
US6397739B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1999 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Sep 30, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21G1/0233
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A calendering method and calender in which a web material is passed through a calender, the calender nip being defined between a heatable hard roll and an endless, flexible and substantially non-compressible calendering belt. The heatable roll is heated in order to plasticize the surface layer of the web and the web is brought into contact with the heatable roll before the calendering of the web. After the preliminary contact of the web with the heatable roll a press treatment proper is applied to the web to be calendered in two stages. First a deformation is produced in the web in a press stage, after that the deformation that was produced is allowed to be reversed partially in a reversing stage and then a new deformation is produced in the web by pressing the web again in a finishing stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.