Handbook of Molded Part Shrinkage and Warpage

Handbook of Molded Part Shrinkage and Warpage

1st Edition - June 2, 2003

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  • Authors: Jerry Fischer, Jerry Fischer
  • eBook ISBN: 9780815517603

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Description

The handbook explains in plain terms why moldings shrink and warp, shows how additives and reinforcements change the picture, sets out the effect of molding process conditions, and tells why you never can have a single ""correct"" shrinkage value. But that's not all. The handbook shows how to alleviate the problem by careful design of the molded part and the mold and by proper material selection. It also examines computer-aided methods of forecasting shrinkage and warpage. And most important of all, the handbook gives you the data you need to work with.This is the most complete collection of shrinkage data ever made and includes an extensive compilation of hard-to-find multi-point information on how processing, part design, mold design, material and post mold treatment affect the part's final dimensions. Manufacturers' figures for thousands of grades, along with an exhaustive search of magazines, journals, conference papers, books, web sites and brochures combine to make this a powerful resource.A lot depends on a dimensionally correct molding. Quality, speed to market, profit margins for the molder and toolmaker, the efficiency of secondary and assembly operations, reputation; all these are on the line. The Mold Shrinkage and Warpage Handbook is the book for people who have to live with shrinkage and warpage. It is the only book for people who have to commit themselves.

Readership

Plastics engineers, technicians, and scientists in injection molding facilities.

Table of Contents

  • Pressure-Volume-Temperature (PVT) Behavior
    Recrystallization and Stress Relief
    Mold Shrinkage (<24 hours)
    Post Mold Shrinkage (>24 hours)
    Material
    Crystalline vs. Amorphous
    Anisotropic Behavior
    Effect of Fillers
    Effect of Pigments
    Moisture Absorption
    Low Warp Materials
    Part Design
    Geometry & Thickness
    Sink Marks
    Mold Design
    Gate Design and Location
    Runner and Mold Cooling Design
    Part Ejection
    Processing
    Mold and Injection Temperature
    Holding Pressure and Time
    Injection Speed and Pressure
    Molded In Stress
    Annealing/Stress Relieving
    Post Mold Fixturing
    Factors Affecting Post Mold Shrinkage
    Pitfalls to Avoid
    Gas Assist and Multi Component Molding Options
    Computerized Shrinkage and Warpage Analysis
    How Does It Work?
    Does It Work?
    How Much Does It Cost?
    How and When to Use It
    Shrinkage and Warpage in Specific Applications
    Material Specific Data Collection of Hundreds of Graphs and Tables
    Shrinkage versus:
    Wall Thickness and Part Geometry
    Mold and Injection Temperatures
    Holding and Injection Pressures
    Time at Various Temperature and Humidities
    Filler Content
    PVT Curves
    Shrinkage Comparison for Thousands of Grades
    Discussions on Mold Shrinkage, Post Mold Shrinkage and Warpage
    Glossary
    Index

Product details

  • No. of pages: 263
  • Language: English
  • Copyright: © William Andrew 2003
  • Published: June 2, 2003
  • Imprint: William Andrew
  • eBook ISBN: 9780815517603

About the Authors

Jerry Fischer

Affiliations and Expertise

Tools and Troubleshooting, Inc.

Jerry Fischer

Affiliations and Expertise

Tools and Troubleshooting, Inc.

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