B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
220/17, 219/2, 9
B31B 1/90 (2006.01) B29C 65/00 (2006.01) B31B 19/90 (2006.01) B31B 19/94 (2006.01)
Patent
CA 1224190
-21- ABSTRACT An improved method and mechanism for forming a chain of laterally interconnected plastic bags which have confronting releasably interlocking rib and groove profile elements on the inner confronting wall surfaces or at the edge of said surface including advancing a tube or a folded film of plastic bag material having inter- locked rib and groove profile elements, forming spaced spot seals at the profile element and alternately at another location to permanently join the layers of material and permanently join the rib and groove elements over the area of the spot, forming lateral seals extending the width of the material at the location of the spot seals to provide side seams for the adjacent bags, and cutting through the material along the center of the seam to partially separate the bags with the cuts extending a predetermined distance partially into the spot seals to control their remaining strength and control the separation force needed to separate adjacent bags.
440818
Minigrip Inc.
Ridout & Maybee Llp
LandOfFree
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