Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1995-11-01
1996-12-10
Sipos, John
Package making
Progressively seamed cover web or web folds
With closing of web between package units
53510, 53167, B65B 906
Patent
active
055819842
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a tubular bag machine having a device for keeping the inside of a flexible film tube free from dust in its sealing region. German Auslegeschrift 2,017,401 discloses such a tubular bag machine whose shaping tube has in the lower region air-outlet openings on the outer circumference. In the shaping tube there is formed by a filling tube arranged therein an annular space which is connected to a source of compressed air or inert gas. In operation of the tubular bag machine, compressed air or inert gas flows through the air-outlet openings, so that there forms, between the shaping tube and the region of the film of a bag pack later forming the transverse seam, a cushion of air or inert gas which prevents dust formed during the filling operation from adhering to this region of the film.
It is disadvantageous in the case of the known tubular bag machine that the compressed air or the inert gas flows at a relatively high speed over the lower edge of the shaping tube in the flexible tube, in the region of the filling-product outlet, and thus results in additional turbulence of the filling product or dust located in the flexible tube. This necessitates waiting a time until the dust has settled in the flexible tube before the region of film forming the transverse seam is transported further, which reduces the output of the known tubular bag machine.
Furthermore, German Auslegeschrift 1,511,636 discloses a congeneric tubular bag machine having a longitudinally displaceable shaping mandrel for delivering the filling product close to the end of the tubular bag and having a suction line for venting the annular space between the shaping mandrel and the filling tube. It is disadvantageous in the case of this tubular bag machine that the displaceable shaping mandrel entails considerable mechanical complexity and, with the use of inert gas instead of air, part of the inert gas is lost from the tubular bag machine.
It is therefore desirable for it to be possible not only to keep the region of film forming the transverse seam of the bag pack reliably free from dust but also to remove the dust by suction. Furthermore, if inert gas is used, as little inert gas as possible should be lost.
ADVANTAGES OF THE INVENTION
The tubular bag machine according to the invention, having a device for keeping the inside of a flexible film tube free from dust in its sealing region, has in comparison, the advantage that air or inert gas is circulated by means of a suction device with a filter and can be fed specifically to the sealing region. This ensures on the one hand that the region of film of the bag pack forming the later transverse seam is reliably kept free from dust and on the other hand that, if inert gas is used, it is to a great extent returned or reused.
Further advantages and advantageous developments of the invention emerge from the description hereinafter.
A simple separation of the annular space between the shaping tube and the filling tube into two elongate regions is possible by means of two sealing elements.
Particularly good conduction of the air stream or gas stream, and a low discharge of filling product are obtained by virtue of an overflow region free from sealing elements in the region of the delivery end of the filling tube.
BRIEF DESCRIPTION DRAWING
An exemplary embodiment of the invention is represented in the drawing and is explained in more detail in the following description. FIG. 1 shows a front view of a tubular bag machine having a device for keeping the inside of a flexible film tube free from dust in its sealing region in a simplified form; and FIG. 2 shows a cross section of the tubular bag machine according to FIG. 1 in the plane II--II of FIG. 1.
DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT
A tubular bag machine 10 known per se has a shaping shoulder 11 and a shaping tube 12, with the aid of which a flexible tube 15 is shaped from a packaging material web 13 of sealable material. Arranged on the outside of the shaping tube 12 is at least one transporting dev
REFERENCES:
patent: 3681892 (1972-08-01), Satranski
patent: 4396582 (1983-08-01), Kodera
patent: 4783947 (1988-01-01), Posey et al.
patent: 4803827 (1989-02-01), Posey et al.
patent: 4825623 (1989-05-01), Ross
patent: 5014493 (1991-05-01), West
Domke Klaus
Nieskens Anton
Stotkiewitz Herbert
Greigg Edwin E.
Greigg Ronald E.
Kim Gene L.
Robert & Bosch GmbH
Sipos John
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