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PIA/GATF Guide to Troubleshooting for the Sheetfed Offset Press

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This quick-reference "press operator's bible," written by PIA/GATF experts and edited by Thomas M. Destree, helps the press operator to analyze more than 100 press problems encountered in all areas of sheetfed offset printing.
Price: $108.90

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Description

Table Of Contents

Feeder and Delivery
Feeder Misses or Feeds Double • Uneven Forwarding • Stain on Sheets • Cocking or Jamming on Conveyor • Front Register Variation • Side Guiding Variation (Push Side Guide) • Side Guiding Variation (Pull Side Guide) • Nicked or Torn Gripper Edges • Wrinkles or Creases • Sheets Pull Out of Grippers and Stick to Blanket • Marking or Smearing • Poor Jogging 

The Printing Unit
Gear Streaks • Nongear Streaks • Uneven Impression • Slurring • Doubling • Marking • Rusting • Overheating

The Inking System
Horizontal Streaks • Uneven Ink Feed • Decreasing Print Density • Mechanical Ghosting

The Dampening System
Dampening Solution Variations • Wash Marks • Snowflaky Solids • Color Variations • Scum Streaks (Around the Cylinder) • Scum Streaks (Across the Cylinder) • Plate Scums After 10,000–20,000 Impressions • Halftone Sharpening • White Spots (Fiber-Shaped) • Roller Scums or Accepts Ink • Plate Dries Up on Gear Side • Plate Wet in the Center • Water Drops Falling on Sheets • Foaming in Dampening System • Water Forms Bands on Rollers and Plate • Water Streaks • Image Wear (Plate) • Nondrying Ink

The Plate
Improper Roll-Up • Scumming • Tinting • Low-Density Printing • Image Blinding • Image Blinding (Bimetal Plate) • Image Loss • Grainy Halftone • Slow Roll-Up • Scratches • Packing Creep 

The Blanket
Incomplete Image Transfer • Ghosting • Picking • Uneven Impression • Smashed Blanket • Streaks • Slur • Misregister

Paper
Wrinkles or Creases • Poor Fit at Tail Edge • Poor Fit at Gripper Edge • Variable Fit • Poor Fit on Multicolor Press • White Spots (Fiber-Shaped) • Rough Solids • White Spots (Non-Fiber-Shaped) • Picking or Splitting • Sheets Curl on Delivery and Jog Improperly • Reverse Curl • Paper Embosses or “Waffles” in Solid Areas • Piling (Coated Paper) • Piling (Uncoated Paper) • Piling (Halftones) • Tinting • Periodic Defects • Strike-Through or Show-Through 

Ink
Ink Dries Too Slowly • Hickeys • Scumming • Setoff • Blocking • Picking/Splitting • Chalking • Ruboff • Poor Adhesion and Nonuniform Lay of Coating • Nonuniform Ink Lay and Adhesion to Plastic • Scuffing of Covers, Labels, or Cartons • Scuffing of Covers During Shipping • Poor Dry Trapping • Ink Crystallization • Poor Wet Trapping • Slur • Mottle • Mottled Appearance on Plastic • Tinting • Piling or Caking • Ink Backs Away from the Fountain Roller • Ink Flies or Mists • Color Fades or Burns Out During Drying • Gloss Ghosting • Color Change • Dot Gain

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