Description This book clarifies and quantifies many of the technical interactions in the process. It distinguishes itself from other books on the
subject by being a seamless story of the advanced aspects of the rotational molding process. There are seven chapters within the book.
The US market for rotational molding products was one billion pounds in the year 2000. The growth of the rotational molding industry
has grown at 10 to 15% per year. With this growth has come an increasing need for details on the complex, technical aspects of the process.
Audience
Engineers and technicians at manufacturing companies in the plastics industry that employ rotational molding technology processes.
Contents 1.0 Introduction
1.1 The Process
1.2 The Early Days
1.3 Materials
1.4 Advantages and Disadvantages
1.5 General Relationships
between Processing Conditions and Properties
2. Rotational Molding Polymers
2.0 Introduction
2.1 General Characteristics of Polymers
2.2 Polymers as Powders and Liquids
2.3 Polyethylene Types
2.4 Polypropylene
2.5 PVC u Plastisols, Drysols, and Powdered Flexible
Compounds
2.6 Nylons
2.7 Other Polymers
2.8 Liquid Polymers
2.9 In-Coming Material Evaluation
2.10 Product Testing Protocols
and Relationship to Polymer Characteristics
2.11 Desirable Characteristics of a Rotational Molding Resin
3. Grinding and Coloring
3.0 Introduction
3.1 General Issues Relating to Grinding
3.2 Particle Size Distribution
3.3 Particle Shape
3.4 Dry Flow
3.5
Bulk Density
3.6 Factors Affecting Powder Quality
3.7 Grinding Costs
3.8 Micropelletizing
3.9 Polyvinyl Chloride
3.10 Coloring
of Plastics for Rotational Molding
4. Rotational Molding Machines
4.0 Introduction
4.1 Types of Rotational Molding Machines
4.2
Machine Design Considerations
4.3 The Oven
4.4 Cooling
4.5 Process Monitors
4.6 Servicing
4.7 Advanced Machine Design
5.
Mold Design
5.0 Introduction
5.1 Mold Materials
5.2 Mechanical and Thermal Characteristics of Mold Materials
5.3 Mold Design
5.4 Calculation of Charge Weight
5.5 Venting
5.6 Mold Surface Finish
5.7 Mold Releases
6. Processing
6.0 Introduction to
Heating
6.1 General Anatomy of the Rotational Molding Cycle
6.2 General Process Description
6.3 Powder Behavior
6.4 Characteristics
of Powder Flow
6.5 Rheology of Powder Flow
6.6 Heat Transfer Concepts Applied to Rotational Molding
6.7 Heating the Mold
6.8
Heating Powder
6.9 Tack Temperature
6.10 Mold Cavity Air Heating Prior to Powder Adhesion to Mold Surface
6.11 Bed Depletion
6.12 Particle Coalescence
6.13 Densification
6.14 Phase Change During Heating
6.15 The Role of Pressure and Vacuum
6.16 Mathematical
Modeling of the Heating Process
6.17 Total Oven Cycle Time
6.18 Cooling and the Optimum Time for Removal from Oven
6.19 Some Comments
on Heat Transfer During Cooling
6.20 Thermal Profile Inversion
6.21 Cooling and Recrystallization
6.22 Air Cooling u Heat Removal
Rate
6.23 Water Cooling u Heat Removal Rate
6.24 Pressurization
6.25 Part Removal
6.26 Effect of Wall Thickness on Cooling Cycle
Time
6.27 Overview and Summary of Thermal Aspects of the Rotational Molding Process
6.28 Introduction to Liquid Rotational Molding
6.29 Liquid Polymers
6.30 Liquid Rotational Molding Process
6.31 Process Controls for Liquid Rotational Molding
6.32 Foam Processing
7. Mechanical Part Design
7.0 Introduction
7.1 Design Philosophy
7.2 General Design Concepts
7.3 Mechanical Design
7.4 Design
Properties of Foams
7.5 Computer-Aided Engineering in Rotational Molding
7.6 Some General Design Considerations
7.7 Process Effects
on Porosity, Impact Strength
7.8 Trimming
7.9 Surface Decoration
7.10 Troubleshooting and Quality Assurance
Appendices
Index
Bibliographic details
Hardbound, 327 pages, publication date: DEC-2001
ISBN-13: 978-1-884207-85-3
ISBN-10: 1-884207-85-5
Imprint: WILLIAM ANDREW
Price and Ordering
Price: USD 210 GBP 126.99 EUR 149.95
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