For automatic alignment of corrugated lines and paper strip conveying machines, the goal is to maintain precise lateral positioning of the paper web (e.g., linerboard, medium, or single-face web) during high-speed production. This ensures consistent corrugation, prevents edge damage, and reduces waste. Here's a breakdown of the key principles and typical solutions:
Core Components of an Automatic Alignment System
Sensors
Edge sensors (photoelectric, ultrasonic, or pneumatic) detect the paper edge position.
CCD cameras or laser scanners provide higher accuracy (e.g., ±0.1 mm) for demanding applications.
For corrugated lines, sensors often monitor the single-face web before the bridge or the double-backer entrance.
Controller
A PLC or dedicated web guide controller processes the sensor signal and sends correction commands.
PID (Proportional-Integral-Derivative) algorithms are commonly used to optimize response speed and stability.
Actuator / Guiding Mechanism
Steering rollers (p…