Flexible bags – With closure – For access opening in sidewall
Patent
1996-11-26
1998-12-22
Pascua, Jes F.
Flexible bags
With closure
For access opening in sidewall
383 41, 383109, 383202, 383906, 220258, B65D 3336
Patent
active
058510729
ABSTRACT:
An improved bulk bag or bulk box liner and spout fitment construction for the liner discharge and/or fill openings. The liner is of liquid impervious thermoplastic multiple-ply sheet material, and the spout fitment is a rigid thermoplastic spout of either open or closed flange type. The spout tube extends through the liner fitment opening and has an external flange base adjacent the liner-interior tube end that is permanently affixed and heat sealed to the liner in a first annular heat weld zone formed between an outward facing surface of the flange base and the interior surface of the liner. A first backing piece of liquid impervious plastic sheet material overlies the inward-facing flange surface and has a marginal portion overlying the liner interior surface. A second annular heat seal is formed between this backing piece and flange base in a second annular weld zone spaced radially inwardly from the first heat weld seal zone. A third annular heat seal is formed between the backing piece marginal portion and the liner interior surface in a third heat annular weld zone spaced radially outwardly from the first heat weld zone. The spout-liner construction is thus held in assembly by the three separate and distinct concentric weld zones. The attachment of backing seals to the flange base is separate and distinct from the attachment of the three liner plies to the opposite surface of the flange base. Likewise, the attachment of the two larger diameter backing pieces at their outer edge to the inner ply of the liner wall is separate and distinct from both of the aforementioned attachment and sealing weld zones. When the rigid spout is of the "open flange" type, the backing piece has an aperture to fit in close surrounding relation to the flange tube with the flange base end protruding through the backing piece aperture into the interior of the liner. When the spout is of the "closed flange" type, the backing piece is imperforate and pierceable to open the spout tube liner-interior end for discharge of liquid therethrough from the liner interior.
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Custom Packaging Systems, Inc.
Pascua Jes F.
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