The Plastic Film and Foil Web Handling Guide

ISBN-13: 9781587161520 / Angielski / Twarda / 2002 / 192 str.

William E. Hawkins

Opis

Written to assist anyone who works with webs, this book is a handbook for diagnosing and correcting problems with web handling technology. Covering web handling fundamentals, process related technologies, and troubleshooting, 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. Topics include web stability, tension isolation, web spreading, static generation, slitting technology, shear knife technology, trim disposal, wrinkle problems, boundary air entrapment problems, unwinding technology, and winding technology.

Spis treści

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

O autorze

William E. Hawkins