Manufacturing container or tube from paper; or other manufacturi – Container making – Rigid container
Reexamination Certificate
2000-07-28
2002-08-06
Smith, Scott A. (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Container making
Rigid container
C493S129000
Reexamination Certificate
active
06428456
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for forming tubular containers with reinforced edges and to a container obtained with the apparatus.
Apparatuses for forming tubular containers with reinforced edges are known. For example, European patent 0 627 355 discloses an apparatus which comprises a square tube around which a flexible film, taken from a reel and guided along a forming collar, is wrapped.
Tabs are provided at the outer edges of the tube and form, on the film wrapped around the tube, V-shaped protruding flaps which are then joined at the facing surfaces by suitable heat-sealing bars.
Bags formed with these devices, however, suffer some drawbacks and particularly:
an unpleasant aesthetic appearance, owing to the presence of the exposed flaps;
bulk during transport;
insufficient stability, since the sides can bend and therefore cause the bag to collapse;
the impossibility to form designs thereon with continuity;
an insufficient protection for the product contained therein, since the upper part is generally shaped like a sloping roof.
Patent DE 19539832 discloses a method for manufacturing bags with reinforced edges starting from a film in which a plurality of heat-sealed folds are formed before wrapping it around the forming tube. Bags with an internal ridge or bags with an external ridge are obtained according to such method, depending on how the film is wrapped around the tube.
A drawback of this method is the great storage volume necessary for the flexible film, since the folds considerably increase the thickness of the roll, together with difficulty in operation for the packaging unit, which has to wrap onto the forming collar, a material which is not perfectly smooth.
If the fold-forming step is performed between the step for unwinding the smooth film from the roll and the step for wrapping it onto the forming collar, there is still the drawback of the excessive bulk of said apparatus.
EP-0729886 A1 discloses a tubular bag-making machine as defined in the preamble of claim 1.
SUMMARY OF THE INVENTION
The aim of the invention is to eliminate these drawbacks and to provide an apparatus for forming containers with reinforced edges which has a modest storage volume.
An object of the invention is to provide an apparatus which allows to produce a package which is monolithic yet has the physical and functional characteristics of packages composed of a plurality of elements (cardboard+composite element).
A further object of the invention is to provide an apparatus which allows to produce containers which are substantially shaped like a parallelepiped, said shape being suitable for products which do not have a shape of their own (for example granular loose products).
This aim, these objects and others which will become apparent hereinafter are achieved, according to the invention, with an apparatus for forming containers with reinforced edges, as defined in claim 1.
REFERENCES:
patent: 4041851 (1977-08-01), Jentsch
patent: 4406646 (1983-09-01), Jentsch
patent: 4685276 (1987-08-01), Kiel
patent: 5862652 (1999-01-01), Schoeler
patent: A-0 729 886 (1996-09-01), None
patent: A-0 769 367 (1997-04-01), None
Sterner Marion
Trani Giorgio
Visona' Sergio
BP Europack S.p.A.
Nathaniel Chukwurah
Oliverio M. Lawrence
Smith Scott A.
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