• Helps the reader visualize concepts with illustrations of major concepts
• Introduces a new way to analyze web behavior
• Makes troubleshooting web handling problems easier
• Condenses 35 years of web handling experience into one resource
• Presents information in an easy-to-read and understand style

Written to assist anyone who works with webs directly or indirectly, The Plastic Film and Foil Web Handling Guide is a handbook for diagnosing and correcting problems with web handling technology. Covering web handling fundamentals, process-related technologies, troubleshooting, and solutions, it includes sufficient technical information to identify and correct defects in rolls (of film or foil). Readers will appreciate this unbiased look at web handling that also serves as a counterpoint to information from equipment suppliers.

The text presents guidelines on:

• Roller alignment in machines
• Tensioning of webs
• Use of web spreading and guiding devices
• Use of razor slitters
• Shear knife slitters
• Edge trim removal
• Trim disposal
• Management of electrostatic charges on webs
• Waste storage equipment

Winding technology is presented that addresses gage variation issues, cores and mandrels, vibration, speed issues, web thickness issues, web strength issues, coated web issues, laminated web issues, clear film issues, winding tension profile issues, and lay-on roller issues. A guide for troubleshooting web-handling problems and a glossary of terms for quick reference is also provided.

Contents

1. WEB STABILITY
   • Imaginary Resistive Tension Member Concepts
   • Alignment Requirements
   • Structure & Stresses Affect Film Web Behavior
   • Tension Limitations
   • Tensions Limitations with Temperature

2. TENSION ISOLATION
   • NIP Roller Tension Isolators
   • Three-Roller NIP Systems
   • "S" Wrapped Driven Rollers
   • Vacuum Rollers
   • Vacuum Belts

3. WEB TENSION MEASURING AND CONTROL DEVICES
   • Web Tension Sensing
   • Dancer-Roller Systems
   • Load- Cell Rollers
   • Mass-Free Dancer Sensing

4. WEB SPREADING
   • Increased Diameter under Web Edges
   • Concave Rollers
   • Bowed Spreader Rollers
   • Air-Bearing Spreading
   • Angled Opposed-Edge NIPS
   • Flexible-Leaf Spreading Rollers

5. WEB GUIDING/STEERING
   • Lateral Shifting of the Unwind and Windup Stands
   • Pivoting Steering/Guide Rollers

6. STATIC MANAGEMENT
   • Charge Buildup Theory
   • Static Removal from Webs

7. SLITTING TECHNOLOGY
   • Razor Blade Slitting
   • Overspeed Settings
   • Other Slitting Techniques
   • Trim Disposal
   • Trim Chopping and Shredding
   • Automatic Trim and Bleed Trim Thread Up
   • Pneumatic Trim Disposal System

8. WINDING TECHNOLOGY
   • Affects of Gage/Caliper Variation
   • Gage Band Randomization
   • Cores and Mandrels
   • Rigidity and Vibration
   • Lay-On Roller Issues
   • Lay-On Roll Parameters
   • Winding Tension/Profiles by Products and Processes
   • Clear Film Issues
   • Winding with Edge Knurls
   • Laminated Web Issues
   • Web Spreading During Winding
   • Issues with Coated Low Strength Films
   • Web Strength Issues
   • Speed Issues

9. TROUBLESHOOTING WEB HANDLING PROBLEMS
   • Wrinkle Problems
   • Web Steering Problems
   • Pucker Problems on Laminated Webs
   • Scratch Problems
   • Curl Problems
   • Web Flatness Problems
   • Tin Canning/MD Wrinkles
   • An MD Wrinkle Theory
   • TD Wrinkles
   • Slip Pimples
   • Snail Trails and Other Defects
   • Static Management

Glossary
Index

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