Package making – Methods – Applying a partial cover
Patent
1992-11-09
1994-12-06
Johnson, Linda B.
Package making
Methods
Applying a partial cover
53176, 53449, 53586, B65B 1102, B65B 1158, B65B 2712, B65B 4906
Patent
active
053699351
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a process and a device.
BACKGROUND OF THE INVENTION
It has been known in practice that the cover films, which are stretched above and below between the pressed bale and the pressure rams, are wrapped by pins and placed on the lateral surfaces of the pressed bale after the press box has been pulled off. If desired, a belly band is placed around the bale, and the package is finally fixed by straps. The relatively inaccurate wrapping with the cover film has proved to be disadvantageous in practice, because the usually rectangular cover film, which projects beyond the base of the bale on all sides, is crumpled in the corners in an undefined manner, and it may become detached, despite strapping, when the pressed bale expands after releasing the pressure exerted by the pressure rams or later, during storage. As a result, the bale package may open, as a consequence of which the pressed bale will be exposed to environmental effects, such as soiling, rain water, etc., in an undesired manner.
SUMMARY AND OBJECTS OF THE INVENTION
It is therefore the task of the present invention to provide a process and a device for reliably and durably wrapping a cover film around a pressed bale.
According to the present invention, a defined fold is formed in the corner zones of the cover film when the cover film is placed on the lateral surfaces of the pressed bale, and this fold is subsequently folded over with a likewise defined movement, and is placed on the pressed bale or the lateral film web already placed around the bale. The entire cover film is thus wrapped around the head area of the pressed bale as a flat envelope in contact with the bale. Due to the defined shaping and end position of the fold in the corner zone, the fold cannot become loose later. The package remains tight, and the pressed bale is protected. In addition, one strapping device is sufficient. Crosswise strapping is not necessary.
The fold can be formed and folded over in the same manner with the upper as well as the lower cover film. The fold is preferably folded over toward the broad side of the pressed bale, because it is fixed directly there by the strapping, which is usually placed around the broad sides. Due to the strapping and the accurate fold formation, the upper edge of the bale, which sometimes tends to bulge out after removal of the pressure ram, is held down better as well. The fold is stretched down by a counteracting force, which is directed downward and inward, counteracts bulging out, and fixes the edge of the bale.
To secure the fold position until strapping, the fold is temporarily held by a folding finger. If the straps or other bale fixing means are placed in another manner rather than over the broad sides of the bale in the case of different packing techniques, the fold is shaped and folded over in a correspondingly different manner, so that it will ultimately be held by the final bale fixing means in the same manner.
The folds are formed by a movable folding frame, which may have different shapes and be moved in different manners. In one of the two preferred embodiments, the folding frame is designed as a rigid stripping frame with stripping openings made in one piece with it for the folds. This embodiment is particularly suitable for the lower cover film, because the stripping frame can be connected to the press box and can be pulled off. As a result, the cover film is also folded and wrapped around along with the pulling off of the box. This makes it possible to eliminate the need for a separate drive for the folding frame. However, the stripping frame can also be used to wrap around the upper cover film. In this case, it is a multiple-part that is movable in itself in order to provide place for the box pulled off and to subsequently close it again around the pressed bale for the folding function.
The second variant provides for a multipart folding frame, which consists of a plurality of rakes, which are movable around a plurality of axes and are able to perform a hor
REFERENCES:
patent: T893007 (1971-12-01), McCormick
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patent: 2858657 (1958-11-01), Guthrie
patent: 2937484 (1960-05-01), Wiman
patent: 3816970 (1974-06-01), VanDoorn et al.
patent: 3893279 (1975-07-01), Bostrom
patent: 3962846 (1976-06-01), Neitzel et al.
patent: 5131210 (1992-07-01), Kiya
Hirschek Herwig
Lang Jurgen
Autefa Maschinenfabik GmbH
Johnson Linda B.
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