Design Formulas for Plastics Engineers
1st Edition
Published on 3. July 2014
182 pages
978-3-446-41300-9 (ISBN)
Description
Although designing machines and dies for plastics processing is routinely done with the help of computer modeling and design programs, the results don't always hold up in industrial application. Therefore, it is essential for the designer to have an understanding of the underlying mathematical concepts and their limitations when working with these programs and/or trying to improve their output.
This book presents a summary of the most important formulas and their applications to solve design and processing problems with plastics materials. Numerous practical examples guide the reader step-by-step through the computational routine of designing polymer machinery. The approach is unassuming and very practical to enable every engineer to apply these concepts in their daily work and improve their equipment and stabilize their processes.
Contents:
- Formulas of Rheology
- Thermodynamic Properties
- Formulas of Heat Transfer
- Designing Plastics Parts
- Designing Extrusion Equipment
- Designing Injection Molding Equipment
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Natti S. Rao | Günter Schumacher
Design Formulas for Plastics Engineers
Book
09/2004
2nd Edition
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€79.90
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Content
- Intro
- Preface
- Contents
- 1 Formulas of Rheology
- 1.1 Ideal Solids
- 1.1.1 Hooke's Law
- 1.2 Newtonian Fluids
- 1.3 Formulas for Viscous Shear Flow of Polymer Melts
- 1.3.1 Apparent Shear Rate
- 1.3.2 Entrance Loss
- 1.3.3 True Shear Stress
- 1.3.4 Apparent Viscosity
- 1.3.5 True Shear Rate
- 1.3.6 True Viscosity
- 1.3.7 Empirical Formulas for Apparent Viscosity
- 1.4 Viscoelastic Behavior of Polymers
- 1.4.1 Shear
- 1.4.2 Uniaxial Tension
- 1.4.3 Maxwell Model
- 1.4.4 Practical Formulas for Die Swell and Extensional Flow
- 2 Thermodynamic Properties of Polymers
- 2.1 Specific Volume
- 2.2 Specific Heat
- 2.3 Enthalpy
- 2.4 Thermal Conductivity
- 3 Formulas of Heat Transfer
- 3.1 Steady State Conduction
- 3.1.1 Plane Wall
- 3.1.2 Cylinder
- 3.1.3 Hollow Sphere
- 3.1.4 Sphere
- 3.1.5 Heat Conduction in Composite Walls
- 3.1.6 Overall Heat Transfer through Composite Walls
- 3.2 Transient State Conduction
- 3.2.1 Temperature Distribution in One-Dimensional Solids
- 3.2.2 Thermal Contact Temperature
- 3.3 Heat Conduction with Dissipation
- 3.4 Dimensionless Groups
- 3.4.1 Physical Meaning of Dimensionless Groups
- 3.5 Heat Transfer by Convection
- 3.6 Heat Transfer by Radiation
- 3.7 Dielectric Heating
- 3.8 Fick's Law of Diffusion
- 3.8.1 Permeability
- 3.8.2 Absorption and Desorption
- 4 Designing Plastics Parts
- 4.1 Strength of Polymers
- 4.2 Part Failure
- 4.3 Time-Dependent Deformational Behavior
- 4.3.1 Short-Term Stress-Strain Behavior
- 4.3.2 Long-Term Stress-Strain Behavior
- 5 Formulas for Designing Extrusion and Injection Molding Equipment
- 5.1 Extrusion Dies
- 5.1.1 Calculation of Pressure Drop
- 5.2 Extrusion Screws
- 5.2.1 Solids Conveying
- 5.2.2 Melt Conveying
- 5.2.3 Melting of Solids
- 5.2.4 Temperature Fluctuation of Melt
- 5.2.5 Scale-up of Screw Extruders
- 5.2.6 Mechanical Design of Extrusion Screws
- 5.3 Injection Molding
- 5.3.1 Pressure Drop in Runner
- 5.3.2 Mold Filling
- 5.3.3 Flowability of Injection Molding Resins
- 5.3.4 Cooling of Melt in Mold
- 5.3.5 Design of Cooling Channels
- 5.3.6 Melting in Injection Molding Screws
- 5.3.7 Predicting Flow Length of Spiral Melt Flows
- A Final Word
- Index
- Biography
