- Description
- Function drawing
Function
In production processes with moving webs, there is typically an unwinder at the machine infeed and a rewinder at the exit. During unwinding, the winding station is moved via a linear drive to feed the web in the desired position. On the other hand, during rewinding, the winding station follows the constantly changing web position via a linear drive to achieve an evenly wound reel.
Area of use
Web guiders with ELWINDER winding stations are used wherever it is not possible to use ELGUIDER or ELROLLER systems due to lack of space.
Application, unwinding
During unwinding, the sensor is mounted on the machine to define the target web position. The position should be acquired as close as possible to the final guide roller on the winding station.
Application, unwinding with synchronous roller
If, for space reasons, it is not possible to fit a guide roller to the winding station, it can be designed as a synchronous electrically coupled roller.
Application, rewinding
During rewinding, the sensor is fastened to the winding station to set the target position of the winding station for the controller. The position should be acquired as close as possible to the final guide roller on the machine. The guiding path L1 depends on the elasticity of the web. The greater the elasticity range in the transverse direction, the shorter the path L1 can be. Experience has shown that the guiding path should be the equivalent of half a web width.
Unwinding
Winding
Legend
A-A = Web tension distribution on the guiding path | K = Web correction | σ1 = Basic web tension | AB = Operating width | 1 = Linear drive | 2 = Infeed rollers | 3 = Winding station | 4 = Sensor | 5 = Locking roller | L1 = Guiding path
