Transcription of Materials and their Flow Properties - Dynisco
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Materials and their Flow Properties - Dynisco
Materials and their Flow Properties 1. Polymers and Plastics 2. 2. Thermopalstic Materials 7. 3. Viscosity and Viscosity Terms 13. 4. Flow Properties Measurement 16. 5. Elastic Effects in Polymer Melts 19. 6. Die Swell 19. 7. Melt Fracture 21. 8. Sharkskin 22. 9. Frozen-In Orientation 23. 10. Draw Down 24. 38 Forge Parkway | Franklin, MA 02038 USA | Tel: +1 (508) 541-9400 | Fax: +1 (508) 541-6206. - 1- Polymers and Plastics A polymer is a chemical compound made up of a large number of identical molecular repeating units. A plastic material is a polymer, generally modified with additives, which is capable of being shaped or molded under reasonable conditions of temperature and pressure. It generally is solid at room temperature and is distinguished from a rubber/elastomer by having a higher stiffness/modulus and a lack of reversible elasticity. A thermoplastic is a plastic material that will soften (melt) on heating and harden on cooling. This softening (or melting) by heat and hardening by cooling can be repeated.
THERMOPLASTIC MATERIALS Over the past 50 years the usage of plastic materials throughout the world has increased dramatically and now stands at well over 100 million tons. In terms of tonnage, thermoplastics are by far the most important, as they are approximately 80% of all plastics used throughout the world. Advantages of Plastics
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