Patent · US Expired

Calender and process for treatment of paper web

US6230615A · kind A · utility

1Cited by

4References

26Claims

0Family size

Assignee

Voith Sulzer Papiertechnik Patent GmbH · DE

Inventors

Lothar Zimmermann · Krefeld, DE
Hans-Rolf Conrad · Dormagen, DE

Key dates

Filing date	Mar 26, 1999
Grant date	May 15, 2001
Priority date	—
Expiry date	Mar 26, 2019

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21G1/00
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Calender for the treatment of a paper web including a roll stack of at least three rolls and with least one double-soft nip. The double-soft nip(s) are formed by two rolls, each with an elastic surface layer. At least one of the rolls forming the double-soft nip is heated. In a process using the calendar to treat a material web, the web is introduced into a roll stack having at least two rolls formed with an elastic surface layer over a rigid core, agglomerated in an elastic double-soft nip between the two rolls, heated to introduce energy into the material web and promote agglomerating, and smoothed in the elastic double-soft nip.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.