1st Edition

The Plastic Film and Foil Web Handling Guide

By William E. Hawkins Copyright 2003
    192 Pages 90 B/W Illustrations
    by CRC Press

    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.

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

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

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

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

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

    STATIC MANAGEMENT
    Charge Buildup Theory
    Static Removal from Webs

    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

    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

    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 OF TERMS
    APPENDIX

    Biography

    William E. Hawkins