Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With cutting – punching – piercing – severing – or tearing
Patent
1998-03-27
2000-06-27
Vargot, Mathieu D.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With cutting, punching, piercing, severing, or tearing
156251, 156581, 1565831, B29C 6502, B65B 3100
Patent
active
060794690
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a transverse sealing device in a tubular bag forming machine for producing tubular bag packages. In such known tubular bag forming machines, first a tube is formed continuously from a sheet of packaging material and then the tube is advanced by the length of one bag at a time; a quantity of a product is placed in its sealed end portion, and this end portion is severed by means of a crosswise seam, which in the just-finished bag package forms a top seam and on the new tubular end portion forms a bottom seam. By means of a cut between the top and bottom seams, the finished bag package is severed. The tube is engaged in an upper position by two pairs of clamping jaws, which engage above and below the location of the crosswise seam, and is then advanced by the length of one bag and finally released. After that, the transverse sealing device returns to the upper position in order to begin a new work cycle. The sealing jaws of the transverse sealing device can be moved back and forth in an interstice between the two pairs of clamping jaws. The sealing face of the sealing jaws is interrupted by a groove, in which a severing knife for cutting off the finished bag package between the top seam of the bag package and the bottom seam of the tubular end portion is placed. In some devices, the severing knife is seated fixedly in one of the sealing jaws and already severs the tube upon closure of the sealing jaws, and dips into a groove in the other sealing jaw. In another embodiment, the severing knife can be advanced and retracted within a groove of the sealing jaw and has its own drive mechanism. It is thrust forward after the sealing operation, in order to carry out the severing of the crosswise seam.
Both embodiments of the known transverse sealing devices have the disadvantage that the severing knife is heated to nearly the sealing temperature by being embedded in a sealing jaw. Moreover, because of the dividing of the sealing face by the groove for receiving the severing knife, a narrow unsealed strip in which particles of the product are located remains on the tube between the top seam of the tubular bag package and the bottom seam of the tubular end portion. Particles of the product repeatedly come into contact with the heated severing knife as they penetrate this strip and then seize and burn on the hot surface of the severing knife. The residue of this burning then cause problems in severing the tubular bag packages from the tube.
ADVANTAGES OF THE INVENTION
The transverse sealing device according to the invention has the advantage over the prior art first that particles of the product are firmly bound in the crosswise seam region of the tube, and second that the severing means has a temperature at which it is not possible for the product particles to burn onto the severing knife. The result in operation of the device is the major advantage that very long service lives of the severing device are attained.
BRIEF DESCRIPTION OF THE DRAWING
One exemplary embodiment of the invention is shown in the drawing and will be described in detail below. The sole drawing shows a transverse sealing device in a tubular bag forming machine in cross section.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
A transverse sealing device 11 is disposed below the forming tube 10 of an apparatus for forming, filling and sealing bag packages 1. This transverse sealing device can preferably be raised and lowered in order to advance the tube 2 formed around the forming tube 10 from a length of packaging material. As known per se and therefore not shown in detail, the transverse sealing device 11 is disposed on a carrier which is moved up and down by the length of one bag at a time. As an alternative, the transverse sealing device may also be stationary, if the tube, as is also known per se, is transported by a tube advancing device.
The transverse sealing device 11 has two pairs of clamping jaws, 12, 13 and 14, 15, which are spaced apart from one another one above the other by an interstice 16. The cl
REFERENCES:
patent: 4050916 (1977-09-01), Gausman et al.
patent: 4255225 (1981-03-01), Evers
patent: 4490207 (1984-12-01), Achelpohl
patent: 4630429 (1986-12-01), Christine
Beck Martin
Stirnkorb Willi
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Vargot Mathieu D.
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