Packaging machine

Details Packaging machine Packaging machine

1996-01-11

1998-01-13

Larson, Lowell A.

Package making

With contents treating

Vacuum or inert atmosphere

53550, 533744, B65B 3100

Patent

active

057066353

ABSTRACT:
A packaging machine (1) is adapted to form a web (8) of packaging material into a tube to surround items (3) to be packed, the tube then being closed, sealed and severed between successive items to produce individual packages (5). The tube is formed by sealing one surface of an edge zone of the web to the same surface of the opposite edge zone of the web so that, in the finished package, the sealed zones form a flap (45) extending longitudinally of the package. The machine comprises a support surface (2) having a longitudinal slot (43) therein, the slot being adapted to accommodate the flap, the machine further comprising at least two pairs of rollers (18,22), at least the first (18) of the pairs of rollers being located beneath the support surface (2), the pairs of rollers forming successive nips for gripping the flap (45) and driving the partly formed packages along the support surface (2) towards a closing, sealing and severing station (23) and for forming the required seal between the edge zones of the web (8), and means (32,34) for applying a vacuum to the tube adjacent the point where the edge zones of the web are brought together to form the tube, wherein the width of the longitudinal slot (43) for at least a section of the slot downstream of the point of application of the vacuum, is sufficiently great relative to the distance of at least the first pair of rollers (18) below the support surface (2) to allow an air passage to be formed within the tube as it moves towards the closing, sealing and severing station (23).

REFERENCES:
patent: 4170863 (1979-10-01), Schwarz
patent: 4715166 (1987-12-01), Kameda
patent: 5014496 (1991-05-01), Davis et al.
patent: 5052166 (1991-10-01), Ziegler et al.
patent: 5109654 (1992-05-01), Suga
patent: 5177935 (1993-01-01), Jones et al.
patent: 5311726 (1994-05-01), Rauscher et al.
patent: 5435115 (1995-07-01), Simmons
patent: 5447012 (1995-09-01), Kovacs et al.
patent: 5473867 (1995-12-01), Suga

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