Method of manufacturing a flexible package comprising a pouring

Package making – Methods – Enclosing contents within progressively formed web means

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Details

383 40, 383 38, 383 58, 383904, 383906, B65B 906, B65D 3301

Patent

active

058326987

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a method of manufacturing a flexible package for liquid or pasty products which includes a pouring channel, and it also relates to the package obtained by the method.


PRIOR ART

A package is already known of the forementioned type, which forms the subject of Patents CH 678,614 and EP 0,377,882 in the name of the Applicant.
It includes a channel adjacent to one of its edges, extending from one end right to a second end, at least one of the two ends being sealed off and intended to be opened in order to draw off the contents and at least one of the two ends being in communication with the main compartment.
The channel is formed conventionally by bringing together two side walls of the package, for example by welding or preferably by mechanical pinching by means of an independent pinching device.
The main aim sought was to improve the duration of preservation of the contents, after opening the package. The reason for this is that, after discharging part of the contents, the contents remaining in the main compartment have not been in contact with air during discharge.
However, the technique of separating the channel from the main compartment by welding has drawbacks from a robustness point of view--it may happen that the weld does not withstand the pressure of the contents during discharge.
Moreover, the pinching system is not always correctly used by the consumer.


SUMMARY OF THE INVENTION

The object of the present invention is to provide a novel technique for the formation of the means for separating the channel form the main compartment. The basic concept consists in forming this separation by means of an attached thin strip which is welded by its edges to the side walls of the package and in which a means of communication is provided between the main compartment and the channel.
More particularly, the invention consists of a method of forming a discharge channel during the manufacture of a flexible package, which channel is adjacent to at least one of the edges of the package and extending from a first end of the package right to the second end, at least one of the ends of the channel being sealed off and in internal communication with the main compartment, the other end being intended to be opened for discharging, characterized in that a partition in the form of a strip is inserted between the two side walls of the package, at least one longitudinal central region of which partition-forming strip has uniformly spaced means of communication arranged so as to be placed above the bottom weld of the package, and in that each side wall of the package is welded to one edge of the partition.
The invention also relates to a package obtained by the method, characterized in that it includes a partition in the form of a strip arranged parallel to one edge of the package in order to form a channel and a main chamber and connecting, in a sealed manner, the side walls of the package from one of its ends right to the other end, the said partition including, in the vicinity of one of its ends, means of communication in order to allow passage of the contents.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1: Sketch showing diagrammatically the manufacture of a first embodiment of a package according to the invention.
FIG. 2: Cross-section of the package depicted in FIG. 1.
FIG. 3: Sketch corresponding to a second embodiment.
FIG. 4: Cross-section of the package depicted in FIG. 3.
FIG. 5: Sketch corresponding to a third embodiment.
FIG. 6: Cross-section of the package depicted in FIG. 5.
FIG. 7: Sketch corresponding to a fourth embodiment.
FIG. 8: Cross-section of the package depicted in FIG. 7.
FIG. 9: Sketch corresponding to a fifth embodiment.
FIGS. 10 to 12: Embodiments of the means of communication which are provided in a separating strip according to the invention.
FIG. 13: Separating strip, the means of communication of which are provided with valve-forming means.
FIGS. 14 to 20: Cross-sections of other possible embodiments of the packages according to the inv

REFERENCES:
patent: 1053605 (1913-02-01), Johnson
patent: 2654527 (1953-10-01), Geckler et al.
patent: 2799314 (1957-07-01), Dreyer et al.
patent: 2800269 (1957-07-01), Smith
patent: 2998340 (1961-08-01), Conway et al.
patent: 3180558 (1965-04-01), Quaadgras et al.
patent: 3383017 (1968-05-01), Krings
patent: 4312473 (1982-01-01), Hoeller
patent: 4557377 (1985-12-01), Maloney
patent: 5322579 (1994-06-01), Van Erden
patent: 5351828 (1994-10-01), Becker et al.
patent: 5538155 (1996-07-01), Hoekstra
patent: 5551208 (1996-09-01), Van Erden

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