Package making – Methods – Closing package or filled receptacle
Patent
1998-03-16
2000-02-15
Kim, Eugene L.
Package making
Methods
Closing package or filled receptacle
531333, 531336, 533742, 533893, B65B 728
Patent
active
060239174
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The EP-A-659 645 discloses a method and a device for the cross-sealing and separating of a packaging tube. The device has two rotating cross-sealing jaws, which divide a foil tube into individual bags and at the same time separate the individual bags from each other with the aid of a zigzag blade. The blade is built into one of the sealing jaws, while the other jaw holds a counter support. The zigzag cut is designed to facilitate the tearing open. However, it has become apparent that only a very sharp blade will permit an easier tearing open by the consumer. The blade must be resharpened correspondingly often.
Another cross-sealing device with two sealing jaws moving in opposite direction is described in the U.S. Pat. No. 4,254,601. A saw-tooth shaped blade is inserted into one of the jaws, which blade separates the packages with a straight-line cut during the cross-sealing. In order to permit an easier tearing open of the packages, respectively one longitudinal slit is cut on both sides of the separating cut during the cross-sealing with respectively one additional blade adjacent to the cross-cutting blade and parallel to the tube conveying direction.
It is the object of the present invention to eliminate this disadvantage. This object is solved with the combination of features in the claims.
Exemplary embodiments of the invention are explained in the following with the aid of the drawing. Shown are in:
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 A diagrammatic view from the side of a cross-sealing device;
FIG. 2 A section through a crush blade;
FIGS. 3-5 Views in the direction of arrows III, IV and V in FIG. 2;
FIGS. 6 and 8 Sections through two other embodiments;
FIGS. 7 and 9 Views in the direction of arrows VII or IX in FIG. 6 or 8; and
FIG. 10 A detail of a package.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a cross-sealing device for a packaging machine. A foil-type tube 3 formed with a longitudinal seam 1 contains at regular intervals the products 2 to be packaged and is transported in conveying direction 4. A sealing jaw 7 and a counter jaw 8 are mounted on two parallel shafts 5, 6, driven synchronously in opposite directions. The one jaw 7 holds a crush blade 9, the other one a counter support 10. The crush blade 9 cuts through the center of the cross-sealing seam, formed with the jaws 7, 8. During the rotational movement, the jaws 7, 8 seal the tube 3 initially at a first location 11. This is followed by the separating cut and subsequent cross sealing at a second location 12. The separated, finished package is removed with a conveyor belt 13.
FIGS. 2 to 5 show an enlarged illustration of the crush blade 9, having a zigzag-shaped crush edge 16, which is formed by the penetration of V-shaped grooves 17, 18. The forward grooves 17, in movement direction 19, are displaced relative to the lagging grooves 18 by one half the groove width. The sides 20, 21 of the grooves 17, 18 are level and are displaced on the side in a mirror symmetry to the center plane 22 of blade 9. The crush edge 16 thus forms a plane 23. Respectively two neighboring sides 20, 21 of adjacent grooves 17 or 18 form a forward cutting edge 24 or a lagging cutting edge 25. Each lagging cutting edge is offset from its adjacent cutting edge by a width of one groove. Forward corners 26 are formed at the intersection of forward cutting edges 24 and the crush edge 16. Lagging corners 27 are similarly formed at the intersection of lagging cutting edges 25 and the crush edge 16. The two sides 20, 21 of grooves 17, 18 form an obtuse angle .beta. of 95-150.degree., preferably about 120.degree., perpendicular to their cutting edges 24, 25 as seen in the cross section. The crush edge 16 does not have to be sharp-edged, but can be blunt with a width of 0.02-0.1 mm.
It has turned out that the serration by means of the sharp-edged cutting edges 24, 25, in particular with the forward cutting edge 24, makes it considerably easier to tear open the packages. An extraordinarily long service life is achieved, owing
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patent: 3943686 (1976-03-01), Crawford et al.
patent: 4254601 (1981-03-01), Prager et al.
patent: 4455808 (1984-06-01), Netzhammer
patent: 4582555 (1986-04-01), Bower
patent: 4949846 (1990-08-01), Lakey
patent: 5477656 (1995-12-01), Loewenthal
patent: 5564263 (1996-10-01), Boulanger et al.
Kim Eugene L.
SIG - Schweizerische Industrie-Gesellschaft
Spencer George H.
Voorhees Catherine M.
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