Guide to Troubleshooting for the Web Offset Press (Hurt)

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Editor: Peter Oresick

An indispensable book that helps the press operator analyze more than 100 press problems encountered in all areas of web offset printing, including these areas: infeed, printing unit, ink feed, dampening, plate, blanket, paper, ink, dryer and chill roll, delivery, and print quality. In this revision of Solving Web Offset Press Problems, an all-new layout and binding format make help to make this problem-solving guide easier to use in the pressroom.

Table of Contents: The Infeed: Splice Breaks • Web Break (no splice) • Uneven Web Surface • Web Weave The Printing Unit: Gear Streaks • Nongear Streaks • Uneven Impression • Slurring • Doubling • Delamination • Rusting • Overheating The Inking System: Roller and Blanket Streaks • Uneven Ink Feed • Decreasing Print Density • Mechanical Ghosting The Dampening System: Dampening Solution Variations • Wash Marks • Snowflaky Solids • Scum Streaks • Water Streaks • Plate Scum • Halftone Sharpening • White Spots • Image Wear • Plate Scumming or Tinting • Nondrying Ink The Plate: Improper Roll-Up • Scumming • Tinting • Low-Density Printing • Image Blinding • Grainy Halftone • Plate Cracking • Packing Creep • Image Loss • Slow Roll-Up • Scratches The Blanket: Imcomplete Image Transfer • Ghosting • Picking • Uneven Impression • Smashed Blanket • Streaks • Slur Paper: Telescoped Roll • Corrugated Roll • Dented Roll • Out-of-Round Roll • Starred Roll • Wrinkles or Creases • Tight Edge • White Spots • Web Breaks • Rough Printed Solids • Picking or Splitting • Delamination • Piling • Decreased Paper Gloss • Tinting • Yellowing Ink: Setoff • Smudging • Chalking • Picking/Splitting • Backing Away • Piling • Scumming • Tinting • Poor Trapping • Color Change • Mottle • Mechanical Ghosting • Hickeys • Misting • Dull Print • Dot Gain Dryer and Chill Roll: Uneven Ink Drying • Wet Ink • Setoff • Hue Change • Reduced Gloss • Blistering The Delivery: Variable Cutoff Misregister • Gusset Wrinkles • Wrinkling • Cutoff Misregister • Sidelay Variation • Poor Folding • Smudging and Scuffing • Static • Curl Print Quality Problems: Misregister • Fan-out • Snowflaky Solids • Dot Gain • Dull Print • Fiber Puffing • Mottle (solids) • Ghosting