Flexible bags – Bag having means to facilitate opening it by severing bag... – Including a separate tearing element which is gripped and...
Patent
1997-01-09
1998-11-17
Pascua, Jes F.
Flexible bags
Bag having means to facilitate opening it by severing bag...
Including a separate tearing element which is gripped and...
383 66, B65D 3300
Patent
active
058366970
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is related to opening devices for flexible containers, particularly packets or envelopes for bulk food products (even under vacuum or overpressure), as well as for powders, liquids and other solid materials.
These containers, sealed by the manufacturers, are opened for removal of the contents traditionally by cutting or tearing a top portion thereof, and cannot be subsequently again closed adequately so as to prevent or at least limit accidental coming out of the products.
BACKGROUND ART
U.S. Pat. No. 3,266,965 discloses an opening device for containers of the above-referenced type formed by a pair of walls sealed around the respective peripheral edges, comprising a tape element intended to be applied to the inner face of one of said container walls and incorporating, along a substantially central area thereof, a longitudinal strip having a substantially initial portion defining a gripper tongue, and wherein said one container wall is formed with an aperture for enabling said gripper tongue to be pulled outwardly so as to perform tear separation of said longitudinal tear strip relative to said tape element and consequent tearing of said one container wall.
According to this known construction, which is specifically directed to containers at least in part made of thermoplastic sheet material, the tape element is a composite layered material having an inner core and two outer covering layers made of a thermoplastic material which is same as or compatible with the thermoplastic material of the container. This tape element is applied to the inner face of the container wall by means of heat and pressure, e.g. by heat welding.
The main drawback of this known solution resides in the complicated and thus expensive construction of the tape element, as well as in the limit that same can only be used in association with containers at least partially made of thermoplastic material.
On the other hand, the aperture of the container wall through which the gripper tongue is accessible from the outside is placed in the immediate proximity of one edge of the container wall and, consequently, the sealed region of the container walls is necessarily formed--so as to ensure airtight closure of the container before opening thereof--with an inwardly recessed region astride the tape element.
A further drawback of this known construction resides in the relatively difficult and thus expensive manufacturing of the container provided with the opening device, in connection with heat-pressure welded sealed connection both of the device onto the corresponding container wall, and between the two container walls.
Pull strip opening arrangements for containers are also generally known from U.S. Pat. No. 4,773,541 and U.S. Pat. No. 4,328,924 and from GB-A-2,172,545.
DISCLOSURE OF THE INVENTION
The object of the present invention is to overcome the above drawbacks and to provide a simple and cheap opening device, which is adapted to be applied to containers made of any kind of material, i.e. not necessarily of thermoplastic material, and which enables both to open the first time the container in a convenient and practical way, and to provide immediate visual indication of any prior opening of the container.
A further object of the invention is to provide an opening device which is adapted to be applied onto the container in a simple and mechanized way.
Another object of the invention is to provide an opening device without any limitations in connection with the material both of the device itself and of the container to which the device is intended to be associated, and also not requiring heat welding techniques for the application thereof.
Still a further object of the invention is to ensure, in the applied condition of the opening device, a total hermetic seal of the container so as to preserve any underpressure or overpressure formed therein.
The device according to the invention is primarily characterized in that said tape element is a label having an adhesive face adhesively secured to said inn
REFERENCES:
patent: 3266965 (1966-08-01), Spees
patent: 4328924 (1982-05-01), Neff et al.
patent: 4773541 (1988-09-01), Riddell
Pascua Jes F.
Sales S.p.A.
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