Package making – Methods – Enclosing contents within progressively formed web means
Patent
1990-07-26
1992-03-24
Terrell, William E.
Package making
Methods
Enclosing contents within progressively formed web means
493 89, 493110, B65B 302, B31B 1564, B31B 3964
Patent
active
050976516
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process and a device for improving the stiffness of a substantially parallelepipedal container made of a synthetic material, the said container being obtained by shaping and weldings from a film which is made of the said synthetic material and is to enclose the liquid to be packaged.
It also relates to containers obtained in this way.
Processes and devices of this type are already generally known per se.
They have, for example, but not in a limiting way, been the subject of patents and/or patent applications filed by the Applicant.
Thus in French Patent 2,554,785 process has been proposed for attaching a stiff or semi-stiff handle to a carton made of a flexible synthetic material. This process is still relatively complex to implement because of compatibility problems between the different materials used. Moreover the stiffening is strictly linked to the grip and the said stiffening is not uniformly ensured over all the surfaces.
In French Patent 2,577,893 filed by the Applicant it has been proposed to equip a flexible bag with rigid stiffening and stabilization means, specifically ribs formed from the material of the film. The implementation of this process in industry remains difficult.
In French Patent Application 2,611,163, also filed by the Applicant, it is envisaged to shape a bag filled with the liquid to be packaged and then to enclose the said bag and to shape it with a sleeve made of a synthetic material which can be drawn, said sleeve being cold-formed by jaws capable of translational movement and at a distance from each other. This device is satisfactory but can be improved as regards the sequence of operations since in this case the stiffening has an effect on the bag which is already filled, this being a source of potential problems for the container of the said bag.
The object of the invention is to overcome these disadvantages of the prior art by proposing a process and a device making it possible for a substantially parallelepipedal container to be obtained which is stiffened uniformly over its four vertical surfaces.
According to the invention this objective is achieved with a process for improving the stiffness of a flexible, substantially parallelepipedal container which has been obtained by shaping and weldings from a film which is made of the said synthetic material and is to enclose the liquid to be packaged, characterized in that it comprises applying, before shaping, to the surface of the said film which does not subsequently come into contact with the liquid to be packaged a second layer of a film of identical or different material, referred to as top film, the said top film comprising a plurality of strips corresponding to the vertical surfaces of the final carton, the said strips being welded to the said film, before its shaping, along lines corresponding to the edges of the final parallelepipedal container.
The invention also relates to a device for the implementation of the said process, said device being characterized in that it comprises, in an apparatus for shaping a first film of flexible synthetic material to give containers, a second apparatus supplying top film unwinding perpendicular or parallel to the said first film, the said second film being applied to the first film by means of longitudinal and transverse weld seams corresponding to the edges of the final parallelepipedal container.
The top film can advantageously be printed and will function as a label.
The invention will be better understood by means of the description which follows of an embodiment given by way of non-limiting example, reference being made to the attached drawings in which:
FIGS. 1a and 1b are diagrammatic views of two variant embodiments of the process according to the invention;
FIG. 2 is an illustration of the shaping of a film obtained by the processes illustrated in FIGS. 1a and 1b;
FIG. 3 illustrates the subsequent stages, namely:
FIG. 3A: filling, then transverse welding and cutting,
FIG. 3B: carton before final shaping,
FIG. 3C: formation of the horns a
REFERENCES:
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patent: 1627811 (1927-05-01), Smith
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patent: 2502117 (1950-03-01), Anderson
patent: 3130649 (1964-04-01), Striplin et al.
patent: 3249286 (1966-05-01), Palmer
Chatourel Daniel
Decottignies Laurent
Societe Generale des Eaux Minerales de Vittel
Terrell William E.
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