AN ULTRASONIC PERFORATOR AND A METHOD FOR PERFORMING AN ULTRASONIC PERFORATION

摘要

The invention includes of a system and method of ultrasonically perforating adhesive bandage backings. The invention eliminates the gap between the ultrasonic horn and the pin roll, and provides for a wear resistant release coating on the pin roll. Further, the method and system disclose cooling the ultrasonic horn with a forced air stream, and provide for a pre- or post-nip roll to control the tension of the continuous web of backing. The web of backing is kept under tension with a n ip roll, and passes between an ultrasonic horn and an immediately adjacent pin roll f or perforation by the ultrasonic horn. The resulting material of the web backin g is smoother, and has better hole quality than that seen in the prior art.