PTP - 2873
Web Positioning Control Systems
- Edge guiding: The most popular type of web position control includes to achieve a desired edge alignment of film at various stages of process. Such a system is especially useful for flexo printing, gravure printing, extruders blown film plant, extrusion laminate, slitting machine etc.
- Chaser guiding: One another type of web position control includes chasing one or two webs to a reference web to achieve a desired edge alignment of multiple layers. This is done by either mechanically or electronically slaving two or more sensors. Such a setup is useful for lamination process.
- Center guiding: Center guiding application may involve either fixed or moving sensor system. The guide system keeps the center line of the web in an exact position. In case of moving sensor center guiding, the sensors continuously reposition themselves automatically to detect both web edges and maintain the center line of the web in an exact position irrespective of any width variation.
- Line guiding: This system uses a printed line or continuous patch or any pattern on the web. The system maintains the chosen mark (printed line or pattern) in exact lateral position irrespective of the web edge position. This system is widely used in slitting machine.