Litho Fall 2010

Litho Fall 2010 - Web Offset GrC 329 Kevin Cooper Not Only...

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1 Web Offset GrC 329 Kevin Cooper Not Only Cold but Not Always Happy! Big Ideas… Lithography is a popular, high-quality process for printing on paper Web offset is cost-effective in many situations New equipment has helped improve web offset print quality.
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2 Web offset products Books Business forms Commercial printing Publications Magazines Catalog Directories Direct Mail Folding cartons Newspapers Retail inserts. Quad Movie Quad Folder\VIDEO_TS.IFO Comparisons to RRD movie? Is a successful web printer just a printer? What else do they concern themselves with? What drives their business? Quad Culture
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3 Not Your Typical Print Plant Press Foundation Reinforced Press Pad Prep
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4 Commercial Ink Totes Lots of Totes! Ink Piping at Quad
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5 Resemblance? Special Color Consideratons Unique to some presses including our Goss newspaper press S-wrap S-wrap Used for printing 4-color on 3 units S-wrap unit prints 2 colors on 1 side of web Direct litho.
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6 Web Folding Folding Combination folder Double former Ribbon. Combination folder Used for commercial and newspapers Components Former board Jaw folder Quarter folder Flexible Folded broadsheet Tabloid Magazine (Double digest). Click here
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7 Former board “V” for folding parallel to web RTF Slit/perf Broadsheet Tabloid Magazine Former nose makes fold Nippers pull. Jaw folder Fold against the grain Double jaws make 2 folds Double parallel 2-up digest (6 X 9) or pocket size (4 ½ X 11) Steps Pins – to transport sheet Cut from web Tucker blade – to create “protrusion” Jaw (grippers) – grabs/folds at tucker blade Tucker blade and pins retract. Quarter folder – chopper Fold parallel to web – perpendicular to jaw fold Slowest fold.
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8 Perforating Why? Tear out – on blanket cylinder Eliminate gussets RTF perf Rotary perf Cross Perf Full web – magazine. Backbone Head Inside Sheet Inside Sheet Ribbon folder Used for high-speed wide-web publications Web split into single-width ribbons Angle bars direct ribbons into a jaw fold Jaw folds in ½ - straight or collect May delivers a short-grain signature Deliver in 1 or 2 streams. Image courtesy of PressTech Controls LTD Web before slitting to ribbons
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9 Ribbon Folders
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10 Ribbon Collection Double former Used for pub/commercial Web split into ribbons Ribbons sent over former boards (only fold) Rotary cutter Produces long grain sigs.
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Newspaper Press – Folder in Middle of the Units Collect vs. straight Possible to collect 2 Sections in jaw before releasing Collect is used with “2 around” presses Top ½ of plate is collected with bottom ½. Older Combo Folder
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This note was uploaded on 12/05/2011 for the course GRC 421 taught by Professor Dougspeer during the Fall '11 term at Cal Poly.

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Litho Fall 2010 - Web Offset GrC 329 Kevin Cooper Not Only...

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