Package making – Methods – With contents treating
Patent
1990-11-05
1992-10-13
Sipos, John
Package making
Methods
With contents treating
53450, 53511, 53550, B65B 906, B65B 3104
Patent
active
051540401
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process and an apparatus for continuous vacuum packaging of products in the form of sheets or plates. This invention is particularly adapted to photosensitive products such as x-ray products.
BACKGROUND ART
Known processes for vacuum packaging such photosensitive products comprise, for example, first producing the packaging itself, which may comprise a wrapping sheet folded along its longitudinal axis and welded on both transverse side edges. Then at a feeding station a sheet is inserted into each folded wrapper by applying suction on one side of the wrapper while the other side is maintained by a holding device so as to produce an opening through which sheets may be inserted one at a time in each open folded wrapper. Then the wrappers are sealed in a vacuum sealing apparatus with a small sealing compartment provided with heat-sealing bars for sealing the open edges of each folded wrapper. With such an apparatus, each wrapper must be brought into the sealing compartment; a valve must be opened to create the vacuum immediately; the heating bars must be put into action to heat the open edges of the wrapper so that the adhesive layer melts and the longitudinal open edge is sealed; the valve must be opened to return to atmospheric pressure and the compartment must be opened. All these operations take time, are difficult to monitor and do not allow high speed series packaging. In addition, it is often long and difficult to adapt the system to other packaging sizes.
German Patent No. 1,511,628 describes a vacuum packaging process and apparatus in which a partial vacuum is applied after the web of packaging material has been formed into a longitudinally extending tube and sealed along its longitudinal edge and across one transverse edge. Because the package is partially formed before the product is inserted and the vacuum then applied, the jet around the product could be irregular. A similar process and apparatus are disclosed in U.S. Pat. No. 4,177,622.
SUMMARY OF THE INVENTION
Therefore, one object of the present invention is to provide a simple vacuum packaging process, which is a high speed continuous process for wrapping products such as x-ray films or plates.
Another object of the present invention is to provide a process allowing a great versatility as regards the packaging size.
Other objects of the invention will appear in the course of the following detailed description.
These and other objects are achieved by the present invention of a continuous vacuum process for packaging individual articles such as plates or sheets within a wrapping sheet folded along its horizontal axis, such process comprising the following steps: is in formation; to delimit a substantially enclosed space; defined in order to bring into contact one over the other the two free half portions of the wrapping sheet so that the article is tightly wrapped; and
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a packaging of the type obtained when carrying out the process of the invention.
FIG. 2 illustrates schematically an example of an apparatus of the type used to carry out the process of the invention.
FIG. 3A illustrates a perspective view of a forming device of the type used in the apparatus of FIG. 2 to fold a wrapping sheet along its longitudinal axis.
FIG. 3B illustrates schematically a view of the apparatus of FIG. 2, taken along line B--B.
FIG. 3C illustrates schematically a view of the apparatus of FIG. 3B, taken along line C--C and of the forming device as viewed directly in FIG. 2.
FIG. 3D illustrates schematically a view of the apparatus of FIG. 3C, taken along line D--D.
FIG. 4A is a schematic diagram of the vacuum pipe used in the apparatus of FIG. 2 to carry out the process of the invention.
FIG. 4B is a section view on line A--A of FIG. 4A.
FIG. 5 illustrates diagrammatically the position of the vacuum pipe in the apparatus of FIG. 2, within the former for the wrapping sheet.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows an example of
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Eastman Kodak Company
Johnson Linda B.
Sipos John
Snee, III Charles E.
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