Package making – Methods – Enclosing contents within progressively formed web means
Patent
1989-01-23
1990-12-04
Ball, Michael W.
Package making
Methods
Enclosing contents within progressively formed web means
53373, 53479, 53551, 53DIG2, 1562724, 1562737, 1562751, 156290, 1563084, 1563096, 219 1075, 219 1079, B65B 908, B65B 922
Patent
active
RE0334677
ABSTRACT:
A method and apparatus for use in form, fill, and seal machines wherein a polyfoil material is compressed between two jaws, one jaw having a secondary induction coil which passes through an electromagnetic field and induces a current in the metallic layer of the polyfoil, to heat and then seal the polyfoil. In a preferred embodiment, a plurality of nonconductive sealing jaws, each containing a secondary induction coil, are mounted on an endless carrying means and a plurality of opposing corresponding rigid pressure jaws are also mounted on an endless carrying means and are arranged so that, as the carrying means advance continuously, each sealing jaw and corresponding pressure jaw contact and compress together facing thermoplastic layers of a polyfoil material and each secondary coil passes through an electromagnetic field to induce a current in the secondary induction coil which in turn induces a current in the area of the metallic foil layer proximate to the secondary induction coil to heat the foil and soften the adjacent thermoplastic materials which, because they are pressed together, will fuse and harden upon cooling. In continuous transverse sealing of a filled polyfoil tube, the pressure jaws may include a knife to sever the seals, the polyfoil tube may be preformed before it is sealed, and the sealing and pressure jaws may have an alignment means to facilitate severing and sealing. The secondary induction coil is preferably an enlongated twin loop coil folded so that one loop is fully subjected to the electromagnetic field and the second loop induces a current in the polyfoil tube.
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High Frequency Heating Review, vol. 1, No. 8, Lepel High Frequency Laboratories, Inc.
Baartman, III John L.
Steck Robert F.
Ball Michael W.
International Paper Company
Isackson Robert M.
Knable Geoffrey L.
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