Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1981-03-06
1983-09-27
Coan, James F.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493936, B31B 2900
Patent
active
044066465
ABSTRACT:
A method of producing a synthetic foil flat-bottom bag capable of receiving liquid, fluid or pourable material and capable of standing up-right when filled, in which a bag closed at the bottom and open at the top is spread apart at opposite sides whereby at its bottom, a bottom surface with two outwardly pointed triangular tips is formed. The two tips are compressed flat with their two-foil walls and are folded downwardly by approximately 180.degree. about a fold line laterally spaced from the bottom of the bag, while the tip ends are placed against the underside of the bottom wall. Thereafter the two tip folds are crease-welded. The thus produced bag has a supporting surface which is enlarged by the welded multi-layer folds and is stabilized, and tightly sealed by the crease welds in the area of the tip. The folding of the tip is preferably effected by means of a form plate which has two parallel form edges extending beyond the bottom surface of the bag. Upon folding and prior to crease-welding of the tips the form plate is removed.
REFERENCES:
patent: 1129130 (1915-02-01), Shaw
patent: 2853225 (1958-09-01), Bauer
patent: 3282411 (1966-11-01), Jardine
patent: 3387701 (1968-06-01), Schneider et al.
patent: 4041851 (1977-08-01), Jentsch
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