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US 6,058,844 AGranted
Method for minimizing web-fluting in heat-set, web-offset printing presses
AssigneeConsolidated Papers, Inc.
InventorJames P. Niemiec
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AssigneeConsolidated Papers, Inc.
InventorJames P. Niemiec
Estimating the term…
A method of and apparatus for minimizing the problem of "fluting" or "corrugating" occuring in printed webs of light weight coated paper printed on both sides with thermosetting ink on heat-set web-offset printing presses resides in spreading the web in its width-wise direction as the printed web exits from the ink drying and heat setting oven of the press and passes over the web cooling chill rolls downstream from the oven, thereby to hold the printed web in a flat and smooth condition until it is cooled and the ink has taken a permanent set. Spreading the web prior to and during cooling allows the inks to thermoset in a flat state because the web is kept flat and free of flutes during thermosetting of the inks. The method and apparatus facilitate operation of the press at higher speeds and with lighter grades of paper than conventional, and provide for increased production efficiencies, lower costs, enhanced print quality, and access to new markets for web-offset printing.
A process of minimizing fluting in a web of light weight coated paper printed on both sides with thermosetting ink in a heat-set web-offset printing press having a floater type drying oven and one or more chill rolls downstream from the oven for cooling the printed and heated web and including a smooth surfaced chill roll immediately downstream from the oven, comprising the steps of:
In a web off-set printing process comprising the steps of feeding a web of light-weight coated paper to a web off-set printing press, printing both sides of the web with thermosetting ink, passing the printed web through a floater oven wherein the web is supported under tension and by oven air flow without physical contact with any structure, heating the web and drying and thermosetting the ink to at least a plastic state in the oven, delivering the printed web from the oven to a chill roll section, contacting the printed web with a plurality of chill rolls to cool the printed web, passing the printed web from the chill rolls to a sheeter/folder/rewinder station, and applying a pulling force to the web at the sheeter/folder/rewinder station to pull the web under tension from the printing press through the oven and chill roll section to the sheeter/folder/rewinder station free of any intervening pressure nips,
Dependencies are inferred from the claim text.