Method and apparatus for making a butt seam having a cover strip

Details Method and apparatus for making a butt seam having a cover strip Method and apparatus for making a butt seam having a cover strip

1986-06-18

1987-09-01

Schmidt, Frederick R.

Manufacturing container or tube from paper; or other manufacturi

Tube making

Assembling of distinct members

156203, 219 85, 493193, 493210, 493302, B31C 106

Patent

active

046906681

ABSTRACT:
A method and an apparatus for heat welding a butt seam on a tube of packaging material, in which the welding heat is generated by applying a high-frequency alternating electromagnetic field of a pair of induction coils. To prevent current arcing at the cut edges of a metal inlay of the packaging material in the vicinity of the abutting edges of a sheet of packaging material, the edges are guided spaced apart from one another by a predetermined distance. To this end, the apparatus has a separating blade, which in the operative range of the electromagnetic alternating field protrudes in between the abutting edges of the sheet of packaging material and between the induction coils.

REFERENCES:
patent: 3131285 (1964-04-01), Kohler et al.
patent: 4210477 (1980-07-01), Gillespie et al.
patent: 4478670 (1984-10-01), Hegse et al.
patent: 4563231 (1986-01-01), Porrmann et al.

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