Package making – Methods – Enclosing contents within progressively formed web means
Reexamination Certificate
2001-06-08
2004-03-02
Rada, Rinaldi I. (Department: 3721)
Package making
Methods
Enclosing contents within progressively formed web means
C053S370600, C053S202000, C053S450000, C053S459000, C053S567000, C053S568000
Reexamination Certificate
active
06698164
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The disclosure of Italian Application Serial No. PD2000A000013 filed Jan. 24, 2000 is incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing containers particularly suitable for containing liquids or viscous or granular fluids by using a film of heat-sealable flexible material.
Containers produced by means of a single- or multilayer film of flexible material and suitable to contain liquids, such as beverages or viscous fluids of various kinds, particularly foodstuffs, are known.
These packages are produced by folding and heat-sealing, along predefined lines and operating sequences, a sheet of heat-sealable flexible film unwound from a roll.
The problems of these containers are connected to the use of flexible film, which in itself does not give shape stability to the container when the latter is filled with a liquid product which also does not have a shape of its own.
This problems affects production processes, which have to obtain structures which are as much as possible locally strengthened or stable so that the container changes as little as possible when an equally shapeless liquid or granular product is introduced.
According to known methods, various kinds of container have been devised in which the local stiffenings and reinforcements are obtained through production processes which entail starting from films in which multiple heat-sealed folds have already been prepared before the use of said films for production of the container.
It is thus possible to obtain ribs which are located in chosen points and allow to strengthen the resulting container.
This method is not convenient, since it entails preparing rolls which already have overlap regions, and this entails much larger volumes for such rolls.
Moreover, these rolls can only allow to obtain containers of a certain type, shape and size, since the stiffening overlaps cannot be located randomly in the container.
SUMMARY OF THE INVENTION
The aim of the present invention is to eliminate the drawbacks of the known art, providing a method which allows to obtain a container having a predefined shape which substantially cannot be modified by the filling product.
Within this aim, an object is to provide a method which starts from a film which is not necessarily prepared beforehand with reinforced regions.
Another object is to provide a method which allows to use conventional machines and systems, albeit with appropriate modifications to the fixtures that are used.
This aim and these and other objects which will become better apparent hereinafter are achieved by a method for producing containers from a film of heat-sealable flexible material, characterized in that it comprises the following steps:
a) unwinding from a roll a portion of film made of heat-sealable flexible material;
b) folding the film, arranging flaps of the film side by side, possibly with an overlap thereof;
c) tucking in folded lateral edges of the film so as to form longitudinal accordion-like portions;
d) providing a transverse heat-sealed portion so as to form a bottom, blocking the accordion-like portions and simultaneously cutting said heat-sealed portion in a median region thereof;
e) inserting the heat-sealed bottom by an extent which is equal to half a width of the accordion-like portion;
f) providing a longitudinal heat-sealed portion in a region where the flaps lie side by side and/or overlap, blocking the bottom and the accordion-like portion and simultaneously cutting the longitudinal heat-sealed portion in a median region thereof.
REFERENCES:
patent: 3581457 (1971-06-01), Gerlach et al.
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patent: 4079662 (1978-03-01), Puccetti et al.
patent: 5570569 (1996-11-01), Masuda
patent: 5806284 (1998-09-01), Gifford
patent: 5832698 (1998-11-01), Huguenin
patent: 1 130 714 (1957-02-01), None
patent: 966 708 (1964-08-01), None
patent: 00 07903 (2000-02-01), None
patent: 01 25111 (2001-04-01), None
Sterner Marion
Trani Giorgio
BP Europack S.p.A.
Kudirka & Jobse LLP
Nash Brian
Rada Rinaldi I.
LandOfFree
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