Dispensing – With cutter and/or punch – To form dispensing opening in container
Reexamination Certificate
2001-10-12
2003-11-11
Mancene, Gene (Department: 3754)
Dispensing
With cutter and/or punch
To form dispensing opening in container
C222S105000
Reexamination Certificate
active
06644509
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a film packing for a pasty substance, in particular an adhesive, sealing and/or forming masses or other age-hardening substances.
Pasty substances are normally marketed in disposable packings which are inserted into application devices such that they can be applied. In some cases the disposable packings are configured as rigid cartridges having a movable bottom which is moved, like a piston, into the cylindrical housing of the cartridge to discharge the pasty substance. Due to the relatively large amount of packing material to be disposed of, flexible disposable packings in the form of film tube bags are frequently used. Said film tube packings are made of a metal or plastic film tube which is tied together by clips at its two ends. Such a film tube bag is inserted into the cylindrical chamber of an applicator which comprises an outlet piece at one end of the cylindrical chamber. A stamp-type plate of the applicator is moved into the other end of the cylindrical chamber, which plate exerts a pressure onto the film tube bag and the pasty substance contained therein so that said substance is discharged through a passage opening in the end of the film tube bag facing the outlet piece and leaves the applicator through said outlet piece. Film packings of the type described above are e.g. known from DE-U-296 17 654, DE-U-296 13 945, EP-A-0 863 088 and EP-A-0 653 362.
The known film packings have substantially proved successful in practical applications. Problems may arise concerning the sealing of the film tube bag front end facing the outlet piece within the cylindrical chamber of the applicator. Said sealing of the end is realized in DE-U-296 17 654 and DE-U-296 13 945 by means of an O-ring seal arranged at the end in a cover element covering one end of the film tube bag. This type of sealing requires that the cover portion is permanently pressed at sufficient force against the end of the cylindrical chamber carrying the outlet piece. This is not adequately ensured at least in those phases in which the film tube bag is located inside the applicator and no pressure is exerted on the film tube bag.
From EP-A-0 607 609 an applicator is known where the components to be applied are inside a film tube bag. Said components are fed through a headpiece to an outlet nozzle. The headpiece is anchored to a cylindrical container wall by means of a screw cap. Further the headpiece is sealed towards the cylindrical container wall via a sealing ring. Said sealing ring is not attached to the film tube bag. Further said sealing ring is effective only in the screwed-together condition of the applicator and is not effective with regard to the screw cap.
Further, EP-A-0 693 437 describes an applicator for two components each packed in a foil tube wherein a headpiece is arranged on each foil tube, the headpiece comprising a central outlet piece. Both outlet pieces extend into the ends of channels of a counter-part part and are sealed towards the channels via an external sealing ring.
In EP-A-0 863 088 and EP-A-0 653 362, it is described that one end of the film tube bag is permanently attached to a cap comprising an outlet piece. Said cap and its outlet piece are then arranged at the front end of the cylindrical chamber of the applicator. Thus the cap forms part of the film packing and must be disposed of together with the film packing, which is expensive because of the relatively large amount of material used for the cap.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a film packing having an improved sealing on said one end side of the film packing.
According to the invention, the above object is achieved by means of a film packing for a pasty substance, comprising
a film tube bag having a peripheral wall and two ends, and
a cover portion fastened to one of the two ends of the film tube bag,
the cover portion comprising an end face having a passage opening for the passage of pasty substance from the opened film tube bag, a peripheral face joining the end face, and a sealing element abutting to a receiving headpiece attachable to the end of the film tube bag carrying the cover portion,
the receiving headpiece surrounding at least the end face and the peripheral face of the cover portion and comprises an outlet piece which is in fluid connection with the passage opening of the cover portion when the receiving headpiece is attached.
According to the invention, the sealing element is arranged on the peripheral face and/or in the transition area between end face and peripheral face of the cover portion of said film packing. The film packing according to the present invention thus possesses a radially acting sealing towards the applicator.
The film packing according to the invention is provided with a film tube bag comprising a peripheral wall and two end faces where the film tube bag is tied together or closed in any other way. One of said two ends carries a cover portion which may be configured as a ring or a disk. Said cover portion comprises an end face and a peripheral face adjoining said end face. Said cover portion and at least a portion of the film tube bag end connected with the cover portion are inserted into a receiving headpiece of an applicator, said receiving headpiece being adapted to be positioned at one of the two ends of a cylindrical pressure chamber of the applicator. Said receiving headpiece is provided with an outlet piece communicating with a passage opening of the cover portion when the receiving headpiece is attached.
To discharge a pasty substance from the film tube bag according to the invention with the aid of an applicator comprising a stamp-type pressure plate, the film tube bag is opened in an area of its one end being in alignment with the passage opening of the cover portion, so that the pasty substance can leave the open film tube bag through the passage opening and the outlet piece being in fluid connection with the latter.
Sealing between the end of the film tube bag carrying the cover portion and the applicator is effected via a radially arranged sealing element located on the peripheral face of the cover portion and/or in the transition area between end face and peripheral face. When the film tube bag is in use, said sealing element rests against the receiving headpiece and/or the cylindrical pressure chamber of the applicator. The sealing element remains in sealing contact with the receiving headpiece and/or the cylindrical pressure chamber irrespective of the pressure exerted by the pressure plate onto the film tube bag. Thus, a reliable sealing is always ensured from the beginning of an application process. In this way the applicator can be effectively prevented from becoming soiled with pasty substance. Only the film tube bag and the cover portion must be disposed of; the receiving headpiece can be reused.
The radially arranged sealing element according to the invention may have different configurations. Appropriately a sealing ring (in particular an O-ring) is used as sealing element, which is arranged in a receiving groove arranged in the peripheral face of the cover portion. Besides a round profile a flat profile may also be used as cross-section of the sealing ring. The sealing element may also be configured as an elastic sealing lip integrally formed with the cover portion. Said sealing lip rests from the inside against the receiving headpiece or the cylindrical pressure chamber of the applicator thus sealing it. A further alternative is to configure the seal as labyrinth seal between the cover portion and the applicator (receiving headpiece and/or cylindrical pressure chamber). Such a labyrinth seal can e.g. be realized by the cover portion comprising on its peripheral face at least one and preferably a plurality of annular projections. In a preferred development of the invention the cover portion comprises on its peripheral edge a shoulder area within which the cover portion surrounds the transition area between the end and the peripheral wall of the film tube bag. Such a shoulder-ty
Bublewitz Alexander
Suchan Matthias
Buechner Patrick
Diller Ramik & Wight
Kettenbach GmbH & Co. KG
Mancene Gene
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