UID:
almahu_9948026559602882
Format:
1 online resource (265 p.)
ISBN:
1-282-00274-0
,
9786612002748
,
0-08-095045-0
,
0-8155-1760-2
Series Statement:
Plastics Design Library
Content:
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 c
Note:
Description based upon print version of record.
,
Front Cover; Handbook of Molded Part Shrinkage and Warpage; Copyright Page; Table of Contents; Chapter 1. Introduction to Plastics Processing; 1.0 Introduction; 1.1 Interactivity Basics; 1.2 Thermodynamic Principles Governing Injection Molding; Chapter 2. Shrinkage and Warpage; 2.1 In-Mold Shrinkage; 2.2 Warpage; 2.3 Post-Mold Shrinkage; Chapter 3. Causes of Molded-Part Variation: Part Design; 3.1 Wall Thickness; 3.2 Ribs; 3.3 Bosses; 3.4 Example of Proper Part Design; 3.5 Other Design Considerations; Chapter 4. Causes of Molded-Part Variation: Material
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4.1 Amorphous and Semicrystalline Resins4.2 Effects of Fillers, Reinforcements, Pigments, Time, and Stress; 4.3 Shrinkage Predictions: Using Pressure-Volume-Temperature (PVT) Relationships; Chapter 5. Causes of Molded-Part Variation: Mold Design; 5.1 Cavity Dimensions and Design Factors; 5.2 Gate Types; 5.3 Gate Location; 5.4 Gate Size; 5.5 Gate-Design Systems; 5.6 Runner Design; 5.7 Mold-Cooling Design; 5.8 Mold Construction Materials; 5.9 Prototype Molding with SLA or Similar Type Molds; 5.10 Pitfalls to Avoid; Chapter 6. Causes of Molded-Part Variation: Processing; 6.1 Molding Conditions
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6.2 Injection Melt Temperature6.3 Injection Rate and Pressure; 6.4 Holding Pressure and Time; 6.5 Mold Temperature; 6.6 Demolding Temperature; 6.7 Molded-In Stresses; 6.8 Other Molding Processes; Chapter 7. Factors Affecting Post-Mold Shrinkage and Warpage; 7.1 Effects of Temperature on Dimensions; 7.2 Effects of Moisture on Dimensions; 7.3 Creep; Chapter 8. Controlling Mold and Post-Mold Shrinkage and Warpage; 8.1 Finding the Cause; 8.2 Processing Considerations; 8.3 Material Considerations; 8.4 Tooling Considerations; 8.5 Part Geometry; 8.6 Controlling Warpage
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Chapter 9. Computer-Aided Analysis9.1 Capabilities of CAA; 9.2 Limitations of CAA; 9.3 Selecting a CAA Program; 9.4 Customer Requirements; 9.5 Management Tools; 9.6 Filling Analysis; 9.7 Packing and Holding Simulation; 9.8 Shrinkage/Warpage Simulation; 9.9 Cooling Analysis; 9.10 Costs; 9.11 Conclusions; Chapter 10. Case Studies; 10.1 Unexpected Housing Shrink; 10.2 Changing Materials Triggers Warpage; 10.3 Creep in a Water Heater Stand; 10.4 Oversize Part Injection-Molding Alkyd Thermoset; 10.5 Inadequate Baby Dish Mold; 10.6 Gas Entrapment in Baby Dish Mold; 10.7 Warpage in a Molded Spool
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10.8 Daisy-Wheel Breakage10.9 PVC Part-Flashing Problems; 10.10 Polycarbonate Switch Failure; 10.11 Square Poker Chip Tray, Inadequate Shot Size; 10.12 Problem Ejecting Square Poker Chips; 10.13 Military Cup Material "Shrinkage"; 10.14 Core-Deflection Problems; 10.15 Elevator Gib Warpage; 10.16 Sucker-Rod Guide Brittleness; 10.17 Bottle-Cap Thread Distortion; 10.18 Plastic Post Creep; 10.19 Excessive Shrinkage of Glass-Filled Nylon; 10.20 Preventing Warpage in Thin Molded Lids; Chapter 11. Data; 11.1 Unfilled Materials; 11.2 Effects of Fillers; 11.3 Shrinkage vs Various Parameters
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11.4 Moisture Absorption Curves
Additional Edition:
ISBN 1-884207-72-3
Language:
English
