Patent ID: 6234419
Filing Date: 2001-05-22
Classification: B65H,D01G

Abstract:
A process for winding up a paper or cardboard web comprising the steps of:(a) supporting a windup roll against a support roller having a volume-compressible outer layer of a thickness of at least 5 mm and composed of a cellular plastic material with a multitude of evenly distributed pores and a modulus of compression .kappa. of less than 10 MPa;(b) driving said support roller with a speed sufficient to produce a final production speed of a wound-up web;(c) feeding said web onto said support roller at a location upstream from a nip formed between said windup roll and said support roller and then through said nip onto said windup roller;(d) controlling a contact pressure of said windup roll against said support roller to produce a width of said nip in a direction of rotation of said support roller and along a periphery thereof which is at least:5 mm when said final production speed exceeds 1000 m/min,15 mm when said final production speed exceeds 2000 m/min,40 mm when said final production speed exceeds 3000 m/min, and70 mm when said final production speed exceeds 4000 m/min; and(e) driving said windup roll relative to said support roller to exert a traction on the web as the web is wound onto said windup roll of at least 1 N/cm of web width.