Non-Contact, Laser-Based Technology for Accurately Measuring the Length and Speed of Product in Web Coating and Lamination

摘要

The accurate control of product length and speed is becoming increasingly important as paper manufacturers and converters involved in web coating and lamination focus on process optimization, quality control, and improving the bottom line. As a long-time practice, length and speed measurements were obtained through tachometers and encoders attached to rollers or contact wheels. However, contact measurement methods are prone to calibration changes due to wear, and they often experience measurement errors caused by slippage between the roll and the material being measured.