A multipurpose sealing and severing mechanism for a bag machine capable of providing one or more seals in thermosealing wrapping material, and severing or perforating the material adjacent the seal area. The mechanism may readily be adapted to produce side weld bags from longitudinally folded wrapping...http://www.google.es/patents/US4019947?utm_source=gb-gplus-sharePatente US4019947 - Multipurpose sealing and severing method and mechanism
Multipurpose sealing and severing method and mechanism
