Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1985-10-21
1986-12-02
Husar, Francis S.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493259, 493313, 493315, 493265, 493332, 53386, B31B 180
Patent
active
046262369
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to improvements to a pinch bottomer, which is a machine that makes paper bags. A novel apparatus is disclosed for ensuring that the two layers constituting the open end of the paper bag remain separated after a hot melt sealing bead has been dispensed on the open end.
BACKGROUND ART
Paper bags are typically made with one closed end and one open end. The open end has hot melt as a thermoplastic bead or film applied so that, when the customer gets the bag, he puts in his material and then passes the open end of the bag through a heat sealer to close and seal the bag with the glue for this operation being provided by the hot melt. When the bag is passed horizontally through a conventional pinch bottomer by a pair of conveyor belts, the hot melt glue is put on by extrusion or by wheel. The end of the bag, if it is a multiple ply bag, consists of a number of layers which are staggered so the glue will be applied to the end of each layer. The problem is that, when the bags come out of the hot melt application station, they cannot be easily opened because the various layers in each bag stick together. So far, it has been proposed to blow air in between the layers. However, this introduces contaminants into the bag. As another alternative, the bags may be opened by hand, which can be quite clostly.
DISCLOSURE OF THE INVENTION
According to the present invention, a pair of specially designed suction wheels are preferably placed after the glue applicator on the pinch bottomer bag-making machine. During manufacture, the paper bags are guided horizontally through the machine by a conveyor forming part of the machine. With this arrangement, one of the suction wheels is placed under the bag, and the other wheel is placed over the bag in line. As each bag is moved by the conveyor, both suction wheels are brought into motion like a rolling operation.
Each wheel has a shaft with a hollow channel going to a suction cup at the periphery of the wheel. The number of suction cups around the circumference of the wheel could be any amount. In a preferred embodiment, there are 12 equally spaced suction cups. A vacuum pump with a hose is connected onto the shaft. The pump draws air through the channel which comes from a suction cup so that, when the bag comes into the vicinity of the suction cup, the cup sticks on the bag layer. Because the bag is moving, the suction cup travels with the bag in the same direction. This action takes place simultaneously with both wheels. By doing so, the two layers of the bag cling to the suction cups. By making a radius, up and down, the bag opens.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side plan view of one of the two identical wheels forming part of the bag opening apparatus of the present invention.
FIG. 2 is a view taken along lines 2--2 of FIG. 1.
FIG. 3 is a view taken along lines 3--3 of FIG. 2.
FIG. 4 is a schematic diagram showing a bag entering a separating station made up of a pair of suction wheels of the type shown in FIG. 1.
BEST MODE FOR CARRYING OUT THE INVENTION
According to the present invention, as shown in FIGS. 1 through 4, a pair of specially designed suction wheels 12 and 14 are preferably placed after the glue applicator on a known pinch bottomer bag-making machine. One machine found useful for practicing the present invention is made by Icoma Packtechnik GmbH, Acher, West Germany, and bears Model No. PB2350. During manufacture, paper bags 16 are guided horizontally through the machine by a conveyor forming part of the machine. With this arrangement, one of the suction wheels 14 is placed under the bag 16, and the other wheel 12 is placed over the bag in line with wheel 14. As each bag is moved by the conveyor, both suction wheels are brought into motion like a rolling operation.
Each wheel has a shaft 18 with a hollow channel 20 (FIGS. 2 and 3) of essentially uniform cross-section going to a suction cup 22 at the periphery of the wheel. The number of suction cups around the circumference of the wheel could be
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Husar Francis S.
Jones David B.
Windmoeller & Hoelscher Corporation
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