Signal Control
Modulation of the repetition rate of electrical or acoustic pulses while keeping the duration of each pulse constant provides a precise method for regulating energy delivery or fluid flow. In packaging production, pulse frequency modulation is used to control the deposition of adhesive or the emission of ultrasonic testing signals. This technique ensures that the amount of energy or material applied remains proportional to the speed of the moving paper web.
Application Method
Implementation of the control system involves a sensor that tracks web speed and adjusts the pulse rate accordingly. With pulse frequency modulation, the dosing of coatings or adhesives remains uniform even when the machinery slows down or accelerates. This prevention of excess application reduces waste and keeps the board dry.
Process Optimization
Precision in the application of adhesive lines prevents squeezing or incomplete bonding at the carton flaps during high speed folding. When pulse frequency modulation is applied to hot melt systems, it ensures that distinct droplets are deposited with uniform spacing regardless of mechanical speed variations. This consistency prevents issues such as glue buildup on folding tools or weak seals on the finished boxes.
By maintaining precise control over the application frequency, converting plants achieve higher efficiency and reduce machine maintenance intervals.
