Method and apparatus for making skirtless seals

Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container

Reexamination Certificate

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Details

C083S016000, C083S171000, C156S251000, C156S515000, C156S583200, C493S199000, C493S203000, C493S205000, C493S208000

Reexamination Certificate

active

08029428

ABSTRACT:
A machine and method for making bags is described and includes a web traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a single sealing zone, and a weakening zone disposed within the single sealing zone. The single sealing zone may be a heated perforator, and may include a heating wire. The heating wire may be an NiCr wire stitched into the heater, and be disposed on a cap or on the seal bar. The weakening zone may create a line of weakness that is uniform or varies in intensity. The sealing zone may include temperature zones, cartridge heaters, cooling air, or heated air, or a source of ultrasonic, microwave or radiative energy.

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Heat Transfer, A Basic Approach, M. Necati Ozisik, 7 pages (pp. 2, 59, 60, 745-747), publisher unknown, date unknown.
Search report for PCT/US08/12573, mailed Jan. 8, 2009, 2 pages, and Search report for PCT/US07/00981, mailed Jan. 15, 2009, 3 pages.

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