This book provides a concise overview of blown film extrusion, progressing from materials through equipment and processing, to film properties and troubleshooting. A primary objective is to ensure a useful balance of theory and practice — the reader will learn the underlying causes of certain effects in the blown film process, allowing more effective troubleshooting and process improvement.

The companion CD-ROM enhances the learning process. This simulator software was developed specifically to teach blown film extrusion equipment operation and processing principles. Throughout the book, exercises using the simulator are described to complement the test: the reader is encouraged to take a break from the book and spend a few minutes with the simulator to reinforce the understanding of the content.

From the Introduction: “...Polymer chemistry and molecular structure are vital in establishing film properties, but bubble geometry resulting from processing conditions is also significant. Molecular orientation and crystalline structure — controlled by bubble dimensions — affect properties such as tensile strength, impact toughness, and clarity...The strong interdependence of process variables is another aspect of the process that requires a high level of operator skill and has led to extensive advancements in measurement and control techniques. There are many process variables — screw speed, nip speed, internal bubble air volume, and cooling rate (frost line height) — that influence bubble geometry and, as a result, fim properties...”

Target Audience: This book/CD-ROM is essential for all manufacturing personnel seeking a broad understanding of the blown film extrusion process.

Table of Contents:

Introduction

Materials for Blown Film

Extrusion Overview

Hardware for Blown Film

Processing

Coextrusion

Film Properties

Troubleshooting

Appendix A: The Blown Film Extrusion Simulator

Appendix B: Useful Equations

Index