1st Edition

The Plastic Film and Foil Web Handling Guide




ISBN 9781587161520
Published October 29, 2002 by CRC Press
192 Pages 90 B/W Illustrations

USD $200.00

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Book Description

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.

Table of Contents

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

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