Automation and Vision Systems
 

Felt and wire stretcher Optimum fabric tension for paper production

Made in Germany. Since 1919.
About Erhardt+Leimer

Felt and wire stretchers guarantee a constant fabric tension

In paper production, it is essential to ensure that the correct fabric tension is maintained. If the tension is too high or too low, this will adversely affect the quality and quantity of the output. E+L fabric tension control systems (felt and wire stretchers) ensure that constant fabric tension is maintained during the production process. 

Function 

Lever-arm type stretching systems monitor and control the fabric tension of wires. Externally mounted fabric tension sensors continuously measure the fabric tension. A digital three-point controller continuously compares the actual value with the set target value and sends a correction value to the actuating drive of the lever-arm type stretcher. The tension on the wire is increased or decreased via the lever-arm type stretcher.

Area of use

The lever-arm type stretching system is used in the area of the wire section for wire tension.

Application

Lever-arm type stretching systems can be freely mounted in terms of position. The adjustment stroke should be dimensioned for a 1-2 % change in length of the wire and the necessary length required for changing the wire. The fabric tension sensor should be installed in the running direction of the wire as close to the stretch roll as possible. Only one lever-arm type stretcher can be operated in automatic mode per wire.  Additional lever-arm type stretchers are to be positioned "manually" for optimum wire tension.

Lever-arm type stretching systems

Lever-arm-type-stretcher SP 09
Lever-arm-type-stretcher SP 09

Fabric tension controller and command station

Command station DO 20 (felt and wire tension)
Command station DO 20 (felt and wire tension)
Function 

Spindle-type stretcher systems monitor and control the fabric tension of revolving felts. Integrated fabric tension sensors acquire the fabric tension continuously and without delay. A digital three-point controller continuously compares the actual value with the set target value and sends a correction value to the actuating drive, as necessary. The tension on the felt is increased or decreased via the spindle-type stretcher.

Area of use

The spindle-type stretcher system is used in the press section of a paper machine.

Application

Spindle-type stretcher systems can be freely mounted in terms of position. Wrapping of 180° is desirable for the stretch roller. The adjusting plane of the spindle-type stretcher should be positioned in the bisecting line between the infeed and outfeed. Wrap angle compensation needs to be incorporated if the overall wrap around the stretch roll is smaller than 150°.

Spindle-type stretcher systems

Spindle-type stretcher SP 08
Spindle-type stretcher SP 08

Fabric tension controller and command station

Command station DO 20 (felt and wire tension)
Command station DO 20 (felt and wire tension)
Function 

Chain-type stretcher systems control the tension in dryer wires. Integrated fabric tension sensors acquire the fabric tension continuously and without delay. A digital three-point controller continuously compares the actual value with the set target value and sends a correction value to the actuating drive, as necessary. The tension on the dryer wire is increased or decreased via the chain-type stretcher.

 
Area of use

The chain-type stretcher system is used in the dryer section of a paper machine.

 
Application

Chain-type stretcher systems can be freely mounted in terms of position. Wrapping of 180° is desirable for the stretch roller. The adjusting plane of the chain-type stretcher should be positioned in the bisecting line between the infeed and outfeed. Wrap angle compensation needs to be incorporated if the overall wrap around the stretch roll is greater than 150°.

Fabric tension controller and command station

Command station DO 20 (felt and wire tension)
Command station DO 20 (felt and wire tension)
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