System information

Function

Spindle-type stretcher systems monitor and control the fabric tension of revolving felts. Integrated 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°.

ELSTRETCHER

Legend

FB = Felt width | LE = Distance to bearing center | FB = Web tension | FS = Actuating force | FG = Weight, stretch roller | FR = Resulting web tension | 1 = Spindle tension | 2 = Infeed roller | 3 = Outfeed roller | 4 = Force sensor | 5 = Outfeed roller | A-A = Web tension distribution | s = Stretching path | α, β = Infeed and outfeed angle

Felt and wire tension system

Spindle-type stretcher system ELSTRETCHER SPA08

Spindle-type stretcher system for the press section with adjustment of the stretch roll parallel to the axis by means of a self-locking trapezoidal threaded spindle

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System components

Fabric tension sensor PD 77

Fabric tension sensor with bearing bracket for external measurement on guide roller

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Fabric tension sensor PD 80

External fabric tension sensor on separate guide roller for pedestal bearing mounting

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Fabric tension sensor EM 08

Integrated fabric tension sensor in spindle-type stretchers with stainless steel press section

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Analog measuring amplifier CV 22

Single-channel measuring amplifier for connecting two fabric tension sensors to a strain gauge bridge

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Digital measuring amplifier with display PA 62

Digital two-channel measuring amplifier for connection of 2 fabric tension sensors with a strain gauge bridge

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Fabric tension controller DC 04

Extremely compact digital fabric tension controller with integrated digital inputs/outputs and three-point controller for actuation of a three-phase motor/solenoid valve for the pneumatic motor

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Command station DO 20

User interface with user-friendly plain text display

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