Method and apparatus for opening roller gap

A technology of roll gap and equipment, applied in the field of opening roll gap and equipment, can solve problems such as increasing the risk of belt damage, and achieve the effect of high web quality, structural space saving, space and material saving

Inactive Publication Date: 2011-05-11
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this type of calender, the web is drawn in by rotating secondary rolls and a close-fitting and circulating belt, which further increases the risk of belt damage

Method used

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  • Method and apparatus for opening roller gap
  • Method and apparatus for opening roller gap
  • Method and apparatus for opening roller gap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] figure 1 The belt calender 1 in is essentially composed of a belt 4 looped around three guide rolls 11, 12, 13, which contacts the counter roll 5 along a wrap angle > 5°. The belt 4 is driven, for example in a manner not shown, by means of one of the three guide rollers 11 , 12 , 13 until it reaches the peripheral speed of the auxiliary roller 5 or of the fibrous web 2 . In practice such strips may be up to 10 m wide. The fibrous web 2 runs through a nip 3 between a belt 4 and a secondary roll 5 . That is to say, the nip 3 is a contact area between the belt 4 and the counter roll 5, said contact area may have a dimension in the direction of web travel of between 100 and 1000 mm, depending on the type of fibrous web.

[0030] The secondary roll 5 is heated in a manner not shown to a surface temperature of over 130° C. and is mounted in a stationary manner. Suitable for heating are heat transfer fluids, which are guided through the interior of the rollers, but also ext...

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PUM

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Abstract

The invention relates to a method and apparatus for opening a roller gap (3) of a belt type calender. The roller gap (3) is formed by a belt (4) circularly enclosing at least two guide rollers (11, 12, 13) and an auxiliary roller (5). The belt (4) clings to the periphery of the auxiliary roller (5) along a winding angle over 5 DEG. A fiber web (2) is used for monitoring crack or wrinkle by means of a sensor (6) in front of the roller gap. When a crack or wrinkle occurs, the sensor (6) sends a signal to a separating device (8) through a controller (7). To create the possibility of the roller gap protecting the belt while being fast separated, the separating device can conduct maneuvering movement on at least one roller gap within 0.9 second during separation process under the maintenance of the belt tension, and the belt (4) can be at a certain distance from the auxiliary roller (5) after the separation process.

Description

technical field [0001] The invention relates to a method for opening a nip for processing a fibrous web, the nip being formed by a belt circulating around at least two guide rolls and counter rolls, for which purpose the belt is in close contact at a wrap angle of more than 5° On the circumference of the auxiliary roll, the fibrous web is monitored for cracks or wrinkles by means of sensors upstream of the nip, and in the event of cracks or wrinkles, the sensor sends a signal to the separating device via the controller. [0002] Furthermore, the invention relates to a device for opening a nip for processing a fibrous web, the nip being formed by a belt circulating around at least two guide rolls and auxiliary rolls, for which purpose the belt has a winding edge of more than 5° The angle is close to the peripheral surface of the auxiliary roller. Background technique [0003] A nip is the contact surface between two annular processing surfaces between which a fibrous web can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F7/04D21F3/02D21G1/00
CPCD21G1/002D21F3/02D21F7/04D21G5/005
Inventor 约肯·尼曼拉斯·克鲁格
Owner VOITH PATENT GMBH
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