Method and unit for longitudinally sealing tubular wrappings

Details Method and unit for longitudinally sealing tubular wrappings Method and unit for longitudinally sealing tubular wrappings

1996-05-09

1998-05-26

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

1562724, 1562751, 156448, 1563801, 493306, B31C 100, B29C 5356

Patent

active

057559074

ABSTRACT:
Tubular wrappings, formed from a sheet with superimposed longitudinal lateral portions and made of partly metal and partly heat-sealable material, are sealed longitudinally by successively feeding the wrappings, by means of a conveyor, in a first given direction and along a given path through a sealing station; by varying the traveling speed of the wrappings in relation to the conveyor so as to successively impart to the wrappings a pause at the sealing station; and by induction heating, for an adjustable length of time during the relative pause, the metal part of the sheet of each wrapping along the relative superimposed longitudinal lateral portions, to melt the heat-sealable part of the sheet.

REFERENCES:
patent: 4310369 (1982-01-01), Miller
patent: 5024046 (1991-06-01), Spatafora

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