Stock material or miscellaneous articles – Sheets or webs edge spliced or joined
Patent
1984-09-07
1986-08-12
Cannon, James C.
Stock material or miscellaneous articles
Sheets or webs edge spliced or joined
156 734, 156157, 156216, 1562751, 1562753, 1563084, 1563244, 428190, 428191, 428200, 428286, B32B 304, B32B 306, B32B 710, B32B 714
Patent
active
046055789
ABSTRACT:
A method of interconnecting first and second material plies, each having one side coated with a thermoplastic material uses pressing means in the form of continuously rotatable pressing rollers and heating means in the form of a heating gas. The marginal edge portion of an uncoated side of the first ply is folded back upon itself to form a pocket along its edge and after a strip of thermoplastic material or a strip having thermoplastic coating on each side is folded lengthwise, it is inserted into the pocket. The marginal edge portion of a thermoplastically coated face of the second ply is then positioned over the folded-over marginal edge portion of the first ply. Thermoplastic material between the folded-over portion of the first ply and the marginal portion of the second ply and between the folded portions of the strip are then heated so that they become thermoplastic and they are pressed together to press the portions to be bonded together. The invention also includes an apparatus for guiding the first ply so that its edge may be folded back upon itself to form the pocket and the firm thermoplastic strip which is first folded is directed into the pocket and guided so that its upper leg portion is positioned within the edge of the lower leg portion and the folded over pocket is guided by a curved extension of the guide so as to facilitate the continuous insertion of a lengthwise folded strip of thermoplastic material into the pocket. The second ply is applied over the folded portion of the first ply and it overlaps the lower leg of the folded-over strip of thermoplastic material. Heating is accomplished by means of gas heating nozzles which are directed between the portions of the folded-over strip and between the folded-over portion of the first ply and the second ply. The location before these plies are directed between rotating pressing rollers.
REFERENCES:
patent: 3172798 (1965-03-01), Rosenbaum
patent: 3695971 (1972-10-01), Corning
Appel Kurt
Emrich Reinhard
Cannon James C.
Pfaff Industriemaschinen GmbH
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