The Plastic Film and Foil Web Handling Guide: 1st Edition (Hardback) book cover

The Plastic Film and Foil Web Handling Guide

1st Edition

By William E. Hawkins

CRC Press

192 pages | 90 B/W Illus.

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Hardback: 9781587161520
pub: 2002-10-29
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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

Subject Categories

BISAC Subject Codes/Headings:
TEC012000
TECHNOLOGY & ENGINEERING / Food Science
TEC016010
TECHNOLOGY & ENGINEERING / Industrial Design / Packaging
TEC021000
TECHNOLOGY & ENGINEERING / Material Science