Manufacturing container or tube from paper; or other manufacturi – Assembling or disassembling of distinct members – Comprising bringing two members together
Patent
1988-03-02
1990-02-20
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
Assembling or disassembling of distinct members
Comprising bringing two members together
493341, 493213, B31B 184, B31B 2190, B65H 3704
Patent
active
049022695
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for sealing a port or fitment on a thermoplastic film.
There are well known machines for manufacturing pouches or bags having a port or fitment constructed from a thermoplastic film. In one step of the manufacturing process of such bags, the ports or fitments must be sealed on the thermoplastic film, generally perpendicular to perforations which have previously been made in the film. The sealing of the port or fitment on the film may be done either by ultrasound, or by a sealing member that is continuously heated, or even by means of a heating resistance intermittently fed an electric current.
In an embodiment of the invention, the present invention relates to a sealing device that includes a welding head with a heating resistance intermittently fed an electric current, and more specifically a ring-shaped heating resistance designed to create a circular seal, for an electric current around a tubular member of the port or fitment to be fixed on the thermoplastic film. In that case, the ring-shaped heating resistance is fed an electric current by means located at two diametrically opposed points. In known devices, an overheating generally occurs at a level of connection between the current supply means and the heating resistance, so a high risk exists that thermoplastic material will be deposited on the heating resistance. This causes a gumming up of the heating resistance and the necessity of an intervention.
SUMMARY OF THE INVENTION
A first purpose of the present invention is to provide a sealing device with a heating resistance having a structure such that it permits a homogenous heating during the feeding of electric current, in order to achieve a high quality feeding of electric current, in order to achieve a high quality seal without any deposit of thermoplastic material on the heating resistance.
Furthermore, in existing devices, the port or fitment is not always suitably positioned with respect to the welding head, so that a risk exists of crushing the port or fitment during the sealing operation.
Another purpose of the present invention is to ensure a precise, relative positioning of the ports or fitments with respect to the welding head.
To accomplish these ends, there is proposed, according to the present invention, a device for sealing a port or fitments on a thermoplastic film that includes a chassis, a support plate attached to the chassis and movable relative to the chassis, a welding head rigidly connected to the support plate, at least one ring-shaped heating resistance carried by the welding head and having electric current feeding rods in two diametrically opposed points, and means for diffusing a cooling gas near the fixation of the feeding rods on the heating resistance.
In that way, the cooling gas regulates the temperature in a point of the heating resistance that is directly acted upon.
In a preferred embodiment of the invention, the means for the diffusion of the cooling gas includes ducts that extend inside the welding head and surround the feeding rods. In that way, the cooling gas ensures not only a regulating of temperature near the fixation point of the feeding rods, but also the cooling of the feeding rods themselves.
According to a further embodiment of the invention, the sealing device includes positioning means located below the welding head. The welding head has cavities facing the positioning means, and preferably, the positioning means includes movable jaws carried by consoles connected to the chassis and maneuvered by means of jacks. In this way, the ports or fitments are positioned in a precise manner immediately prior to the sealing as the ports or fitments are maintained in position by the positioning means until the time when a part of the ports or fitments is received in the cavities of the welding head.
According to still another embodiment of the present invention, the chassis is mounted on a pivoting shaft carried by a chassis adjacent to the film. The pivoting shaft extends parallel to one
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Soubrier Pierre
Susini Etienne
Barrett Robert M.
Baxter International Inc.
Flattery Paul C.
Lavinder Jack
Schaafsma Paul E.
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