Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1988-03-02
1989-12-19
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493254, 493439, 493248, B65H 4509, B29C 5304, B31B 2300
Patent
active
048879738
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a shaping device for a flexible film, specifically, although not exclusively for making bags containing a perfusion liquid.
There are already known machines for manufacturing bags from a flexible film of plastic material. More specifically, there are known machines for manufacturing bags from a web of thermoplastic film. These machines include a series of stations at which the thermoplastic film is treated in succession. Generally, the film is unwound from a spool then perforated. Perpendicular to the perforations, ports or fitments are heat sealed by a welding head. The film is then shaped in a shaping device principally designed to fold the film back on itself in order to obtain an edge to edge sealing. The film that has been sealed edge to edge forms a tube that is then sealed in the transverse direction at regular intervals to form individual bags. Those individual bags are filled prior to manufacture of a second transverse seal which forms the bag.
The present invention relates particularly to the film shaping device, which is a station located after the positioning and sealing of the ports or fitments and prior to the sealing of the film edge to edge. French Pat. No. 2 528 801 describes a shaping device having a shaping plate extending in a direction transverse to a direction of the film. The device has a slit, preferably a U-shaped slit, with two arms joined together by a connecting portion and an opening adjacent to the slit. When the film equipped with ports or fitments has first been fed in a flat position and passes through the slit of the shaping device, it is folded back on itself and each port or fitment passes through the opening adjacent to the slit. At the exit of the shaping device, however, no special guiding is provided. A return is generally done by transverse rollers that project on each side of the film. When the ports or fitments are positioned along an edge of the shaped film, a risk exists that the flange of the port or fitment sealed to the film may press too strongly against the return roller and cause either a tearing of the film or damage to the seal between the flange and the film.
SUMMARY OF THE INVENTION
The present invention provides a shaping device for a flexible film equipped with projecting ports or fitments to ensure an even shaping of the film without any risk of damage.
To this end, the present invention provides a shaping device for a flexible film equipped with projecting ports or fitments, the shaping device includes a shaping plate extending in a direction transverse to the film, a slit with two arms joined together by a connecting portion, and an opening adjacent to the slit. The opening is positioned so that the ports or fitments will be positioned along one edge of the shaped film when the film exits the shaping device. A return roller in the shaping device having one end recessed relative to an edge of the folded film with the ports or fitments is located downstream from the shaping plate. This allows the ports or fitments to overhang relative to the return roller and no stress is exerted on the film nor on the flange of the ports or fitments.
In an embodiment of the invention, the shaping device has a lug means affixed to one end of the arms of the slit in the shaping plate in a direction transverse to the latter.
In that way, if the film does not present itself on an axis of the shaping device, one of its edge will rub against the lug means and causes the film to shift until it is suitably positioned on the axis of the device. According to a preferred embodiment of the invention, the lug means is movable, specifically it comprises a small plate placed flat against the shaping plate and held against it by movable means, preferably by bolts that run through the small plate and are engaged in apertures in the shaping plate. In that way, the shaping device can easily be adapted to films of different widths. According to another embodiment of the invention, the slit is surrounded along one edge, a
REFERENCES:
patent: 3013301 (1961-12-01), Lang
patent: 3482491 (1969-12-01), Gustafson
patent: 3576051 (1971-04-01), Click
patent: 3577301 (1971-05-01), Gustafson
patent: 3908979 (1975-09-01), Cloud
patent: 4050361 (1977-09-01), Traise
patent: 4277302 (1981-07-01), Reid
patent: 4566250 (1986-01-01), Matsumura
patent: 4603536 (1986-08-01), de la Poype
patent: 4710157 (1987-12-01), Posey
Soubrier Pierre
Susini Etienne
Barrett Robert M.
Baxter International Inc.
Flattery Paul C.
Lavinder Jack W.
Schaffsma Paul E.
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