Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With means applying wave energy or electrical energy...
Patent
1993-06-08
1996-04-09
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With means applying wave energy or electrical energy...
156438, 156466, 156498, 1565835, B30B 504, B30B 1534
Patent
active
055058132
ABSTRACT:
An apparatus for the production of tubular bodies, in particular for packaging tubes, from a foil strip (48) which comprises weldable plastic material and the longitudinal edges of which are thermally joined together has a shaping belt (46) which co-operates with shaping rollers (59, 60) and which shapes the foil strip (48) around a mandrel (45) to provide a tubular body, a lower driven transportation belt (20) which runs in the mandrel (45) and an upper driven transportation belt (33), the longitudinal edges of the foil strip (48) being accommodated in mutually overlapping relationship between the transportation belts. The upper transportation belt (20) is in the form of an endless belt which passes beneath a heating means, a pressing means and a cooling means and the heating means is in the form of an inductively operative high frequency heating means. In a process which can be carried out with that apparatus, the foil strip (48) is formed into a tube with an overlap formed from the edges of the foil, for the purposes of forming a welded seam in its longitudinal direction, and the overlap is introduced with its outer and inner sides of the tube into a belt gap (70) which is formed from the two transportation belts (20, 33) which are driven and circulate endlessly in parallel relationship, is melted therein by the transportation belts (20, 33) at least until phases which are capable of flow are formed, is pressed with preliminary hardening of the phases which are capable of flow, and is then cooled under the application of pressure.
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Burger Hans
Scheifele Freddy
Ball Michael W.
Crispino Richard
KMK Lizence Ltd.
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