Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1997-06-24
1998-06-23
Culver, Horace M.
Package making
Progressively seamed cover web or web folds
With closing of web between package units
53552, B65B 920, B65B 922
Patent
active
057688613
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a bag forming, filling, and sealing machine. Machines of this kind for producing so-called 4-edge bag packages have already been disclosed. These bag packages have two sealed longitudinal seams and two sealed lateral seams. For this purpose, the known bag forming, filling, and sealing machines work with two heat-sealable devices which are superposed one covering the other, whereupon sealing devices disposed laterally to the sheets of packaging material form the two longitudinal seals. The tube thus formed is then supplied to a lateral sealing device for the production of the two lateral seams. Furthermore, vertical bag forming, filling, and sealing machines have been disclosed which have a tube forming device comprised of a forming shoulder and a forming tube. However, the production of the above-mentioned 4-edge bag packages with bag forming, filling, and sealing machines of this kind by means of a single sheet of packaging material has not been possible up to this point.
ADVANTAGES OF THE INVENTION
The bag forming, filling, and sealing machine, has the advantage over the prior art that 4-edge bag packages with two longitudinal seams and two lateral seams can be produced from a single sheet of packaging material using bag forming, filling, and sealing machines which have a forming shoulder and a forming tube. This is achieved according to the invention by means of a one-piece, angled forming tube and a wedge-shaped element. With these two elements, it is possible to form the second longitudinal seam from one part of the tube wall, without tensions being produced in the tube which otherwise would harm the form or functionality of the bag packages.
Other advantages and advantageous improvements of the bag forming, filling, and sealing machine according to the invention ensue from the description set forth hereinafter. An improved formation of the longitudinal seal and a more precise supply of the longitudinal seal to the subsequent longitudinal seam sealer can be achieved by means of two guides, which are disposed on both sides of the shoulder element. The width of the longitudinal seam can be adjusted in a simple manner by means of a cutting device connected to the longitudinal seam sealer.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is shown in the drawing and explained in detail in the description below.
FIG. 1 is a perspective view of a bag forming, filling, and sealing machine,
FIG. 2 is a perspective view of a part of the machine according to FIG. 1, and
FIG. 3 is a simplified side view of the machine according to FIG. 1.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The bag forming, filling, and sealing machine 10 shown in FIG. 1 is used for the production of bag packages 1 with two longitudinal seams 11, 12 and two lateral seams 13, 14 out of one heat-sealable sheet of packaging material 15. For this purpose, the bag forming, filling, and sealing machine 10 has a tube forming device 17, which is comprised of a forming shoulder 18 and a forming tube 19 connected to it. The endless sheet of packaging material 15 is formed into a tube 20 by means of the tube forming device 17. On the forming tube 19, a device 21 is disposed that has two preferably vacuum supported conveyor belts 22, 23 for feeding the tube 20 downwardly.
The cylindrical forming tube 19 has two sections 24, 25 with equal outer diameters, which are connected flush to each other in order to avoid producing shoulders or edges. The symmetry axis 26 of the first section 24, which is connected to the forming shoulder 18, is inclined in relation to the symmetry axis 27 of the second section 25 by an angle .alpha., wherein the angle .alpha. points in the direction of the incoming sheet of packaging material 15. On the first section 24 of the forming tube 19, on the side of the incoming sheet of packaging material 15, a wedge-like, plate-shaped element 28, which protrudes perpendicularly from the first section 24 and continuously tapers in its width H toward the second section
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Culver Horace M.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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