Method and apparatus for ultrasonic sealing

An apparatus for sealing flexible packaging material on a form and fill packaging machine to produce flexible bags having ultrasonically sealed end seals, comprising:

• a. cooperating land and valley regions provided on a portion of first and second movable members;
• b. a plurality of first land regions comprising an anvil on said first movable member, said first land regions extending beyond a centerline of said first and second members when closed;
• c. said first land regions interacting with a plurality of second land regions on said second member, said second land regions extending beyond said centerline;
• d. said first and second land regions cooperating such that packaging material is biased against said anvil when said first and second movable members are closed;
• e. said second movable member provided with an ultrasonic horn which effects an ultrasonic seal at the location of said anvil when the packaging material is biased thereagainst;
• and
• f. an ultrasonic back seal forming device for making continuous longitudinal ultrasonic back seals, said back seal being sealed in the direction of travel of said packaging material.

An apparatus for sealing flexible packaging material on a form and fill packaging machine to produce flexible bags having ultransonically sealed end seals, comprising:

• a. cooperating land and valley regions provided on a portion of first and second movable members;
• b. a plurality of first land regions comprising an anvil on said first movable member, said first land regions extending beyond a centerline of said first and second members when closed;
• c. said first land regions interacting with a plurality of second land regions on said second member, said second land regions extending beyond said centerline;
• d. said first and second land regions cooperating such that packaging material is biased against said anvil when said first and second movable members are closed;
• e. said second movable member provided with an ultrasonic horn which effects an ultrasonic seal at the location of said anvil when the packaging material is biased thereagainst;
• and
• f. mechanical cutting means provided on said first movable member to sever a sealed bag from said flexible packaging material.