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US 4,050,361 AGranted
Plow folding and heat sealer apparatus for continuous business forms
AssigneeMoore Business Forms, Inc.
InventorJohn E. Traise
Life of this patent
Estimating the term…
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AssigneeMoore Business Forms, Inc.
InventorJohn E. Traise
Estimating the term…
An apparatus to effect longitudinal plow folding and subsequent heat sealing of previously computer printed continuous business forms stationary includes a folder and a plurality of elongated heating ribbons disposed parallel to the direction of web travel in spaced apart parallel relationship and being convexly curved for supporting the continuous web passing thereover. Hot melt adhesive applied during manufacture of the stationary is disposed between the plies of the folded-over web, to be locally heated through the web as it lays against, and advances directly over, the multiplicity of parallel heating ribbons. Upon exiting the heater bed, a sandwich platen is provided to maintain the plies in intimate contact, while removing heat from the web and adhesive to bond the plies at each of the multiplicity of spots so heated. The folded and sealed web may then be processed by conventional bursting into individual sealed documents, for mail processing or confidential distribution.
An apparatus for effecting plow folding and subsequent heat sealing of a continuous web, comprising, a plow folding station for effecting a longitudinal folding of the web about a longitudinal line of weakening thereof, a heat sealing station for effecting a sealing together of the folded-over portions of the web as hot-melt adhesive disposed between the portions is melted by heating, first means for feeding the web in a flat and unfolded condition at a first rate of speed into said plow folding station, second means at said heat sealing station for feeding the folded and sealed web outwardly of the apparatus at a second rate of speed faster than said first rate to thereby tension the web at said heat sealing station to a greater extent than at said folding station, and a combined wb drive and snubber roll means disposed between said stations for initially feeding the folded web into said second feed means at said heat sealing station and for subsequently snubbing the web, whereby the higher tensioned web at said heat sealing station is isolated from the lesser tensioned web at said folding station, said web drive and snubber roll means including a roll mounted for movement between a drive and a snubbing position.
An apparatus for effecting plow folding and subsequent heat sealing of a continuous web, comprising, means for continuously folding opposing edges of the web into overlying relationship from a flat condition of the web as it moves through the apparatus, heat sealing means downstream of said folding means for sealing folded-over portions of the web together as hot-melt adhesive disposed between the portions is melted by heating, first means for feeding said web into said fold means at a first rate of speed, second means for feeding said folded web at said heat sealing means at a rate faster than said first rate to thereby increase web tension at said sealing means as compared to that at said folding means, a combined drive and snub roll means disposed between said folding means and said sealing means for initially feeding the web into said second feed means and for subsequently snubbing the web for isolating the increased web tension at said sealing means from the web tension at the folding means.
Dependencies are inferred from the claim text.