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US 6,234,419 B1Granted
Winding-up process and machine for winding up paper or cardboard webs
AssigneeJagenberg Papiertechnik GmbH
InventorsReinhard Hehner, Georg M{overscore (u)}ller, Hans-Friedrich Peters
Life of this patent
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Abstract
A process and a winding machine for winding up paper or cardboard utilizes a support roller with a compressible outer layer of at least 5 mm in thickness and a modulus of compression of less than 10 MPa and the contact pressure controlled so that the width of the nip has a minimum value which is a function of the speed with which the web is wound up.
Claims10
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 κ 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, and
- 70 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.
7 more elements
A winding machine for winding up a paper or cardboard web, said winding machine comprising:
- a longitudinal cutter along a path of said web for subdividing said web into a plurality of individual web strips;
- a driven 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 κ of less than 10 MPa;
- plurality of winding stations arrayed along said support roller for winding said web strips on respective windup rolls, said of said stations including support elements movable transversely of a direction of travel of said webs and respective heads engageable in opposite ends of the respective windup roll and holding each windup roll against said support roller to form a nip therewith, each of said web strips being fed onto said support roller at a location upstream from the respective nip and then through the respective nip onto the respective windup roller;
- means for controlling a pressure of each 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, and
- 70 mm when said final production speed exceeds 4000 m/min;
- and
- a respective drive for at least one head at each station for 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.
7 more elements
Dependencies are inferred from the claim text.