Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1989-09-01
1992-04-07
Terrell, William E.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493256, 493264, 493936, B31B 3326, B31B 3300
Patent
active
051023849
ABSTRACT:
A method is disclosed of constructing a flat bottom in a plastic film tube having an open upper end, a closed lower end formed by a transverse seal, forward and rearward sides and a pair of opposing pleated sides that interconnect the forward and rearward sides. The method includes the steps of releasably engaging a lower vacuum and a lower clamp with a transverse section of the rearward side of the tube to provisionally hold the transverse section. A lateral section of the forward side is gripped and raised by an upper vacuum and an upper clamp to expose a portion of the pleated sides such that first and second pockets are formed, respectively, in the sides. The sealed lower end is drawn toward the upper end to fold the tube along first and second transverse fold lines in the forward side, along a third transverse fold line in the transverse section of the rearward side, and along fourth and fifth fold lines, respectively, in the pleated sides such that the first and second pockets are located in the pleated sides, respectively between the first and third fold lines and the lower end of the bag. Pressure is applied to the tube to form creases along the first, third, fourth and fifth fold lines, which define the perimeter of the flat bottom of the tube.
REFERENCES:
patent: 736673 (1903-08-01), Bartholomew
patent: 3646856 (1972-03-01), Worndl
patent: 3886850 (1975-06-01), Cole
patent: 3896709 (1975-07-01), Brinkmeier
patent: 3896714 (1975-07-01), Bosse
patent: 3988970 (1976-11-01), Hanson et al.
Brown, deceased Martin J.
Brown, heir Letitia A.
Hagenburg, heir Maureen
Ross Philip E.
Weiss, heir Christine M.
Noonan William E.
Terrell William E.
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