A motor-driven and controlled packaging machine for forming pouches from a web of material. The controls allow the machine to be run with either a continuously or intermittently advancing web. Seal bars are mounted on moveable carriages which move with the web as they form the seals. A web unwind is...http://www.google.es/patents/US6393809?utm_source=gb-gplus-sharePatente US6393809 - Servo-controlled pouch making apparatus
