Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With means applying wave energy or electrical energy...
Patent
1985-01-07
1987-02-03
Wityshyn, Michael
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With means applying wave energy or electrical energy...
1563808, 156 69, 156 731, 1562751, 1565801, 156581, 53361, 53362, 53328, 53489, B31F 700
Patent
active
046407332
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for forming and inserting an internal lid in a tubular package of cardboard or any other material having equivalent strength properties and for sealed connection of the lid to the inner surface of the package by constant heat welding, high frequency welding or ultrasonic welding, comprising a carrier for supporting the package tube while introducing and weld connecting the lid in the interior of the tube, a support for positioning a plane punched lid blank having a larger periphery than the package or container tube, a piston means for forcing said lid blank into the container tube during which operation an edge of the lid blank is folded upwards, the piston means comprising a lower part and an upper part which are axially movable in relation to each other and between said two parts an expandable means which is pressed radially outwards when the two piston parts are moved axially towards each other.
An apparatus of the above defined type is known from applicant's own Swedish patent (patent application No. 810005334-0, equivalent to U.S. application Ser. No. 414,056). The patent shows an apparatus in which both the press piston and the carrier for the container tube are at least slightly conically widened adjacent the area in which the piston is to be introduced in the container tube and welded to the inner surface of said container tube. The patent mainly discusses containers having a body of cardboard or similar material.
It has been shown that the conical form of the press piston and of the carrier is not necessary and that a conical form thereof may even in some cases provide problems in the manufacture of containers made of stiff cardboard or a bulky cardboard material. Said problems especially relate to sealing problems at the joint between the lid edge and the container tube. The problems also may relate to the exact adjustment of the position of the press piston. In case of a slightly too high position of the press piston in relation to the cone of the carrier the contact pressure between the lid edge and the container tube is too low and the joint, especially the weld joint between said two parts, becomes imperfect and may provide a leakage. On the other hand, in case of a too low position of the press piston the contact pressure is too high, which may cause the joining material, for instance the weldable plastic material, to be pressed out of the joint, whereby a too narrow thickness of material is obtained in the press joint, and in addition thereto these may even be a risk of burning through. In both cases there is a risk of leakage.
Further when the lid is forced into the end of the container tube, folds and wrinkles unavoidably appear in the folded up lid edge or lid rim by means of which the lid is connected to the container tube. Said folds or wrinkles become heavier the thicker the material is in the lid, and further the size of said folds and wrinkles increases with increasing distance from the bottom surface of the lid. The joint, especially the weld joint between the lid edge or lid rim and the inner surface of the container tube therefore should be placed as close to the bottom of the lid as possible, and at the same time the height of the lid rim may be reduced. Also considering the consumption of the material and the wish to utilize as much of the volume of the container tube as possible it is a wish that the lid rim is as low as possible. In applicant's above mentioned previous patent the lid is welded to the container tube over a relatively large portion of the height of the lid rim, and the metal ring for providing the constant welding, the high frequency welding or the ultrasonic welding is provided relatively close to the upper end of the lid rim.
For providing a good and sealed weld joint it is important that the pressure between the lid rim and the container is maintained between a specific lowest and highest pressure. A pressure that is too low gives an imperfect weld joint and a risk of leakage, a pressure that is too high in turn
REFERENCES:
patent: 1888397 (1932-11-01), Slick
patent: 2402943 (1946-07-01), Bogoslowsky
patent: 2423965 (1947-07-01), Coyle
patent: 3346435 (1967-10-01), Beck
patent: 3549440 (1970-12-01), Adcock et al.
patent: 3700513 (1972-10-01), Haberhauer
patent: 4282699 (1981-08-01), Embro, Jr.
Cashion Merrell C.
Nilles James E.
Wityshyn Michael
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