Design Data for Plastics Engineers by Natti S Rao

By Natti S Rao

Presents a brief reference on simple layout facts for resins, machines, components, and strategies displaying tips on how to practice those facts to resolve sensible difficulties. Softcover. DLC: Plastics.

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2 Viscous Shear Flow Macromolecular fluids like thermoplastic melts exhibit significant non-Newtonian behavior. This is noticed in the marked decrease of melt viscosity when the melt is subjected to shear or tension as shown in Fig. 4 and in Fig. 5. The flow of melt in the channels of dies and polymer processing machinery is mainly shear flow. Therefore, knowledge of the laws of shear flow is necessary for designing machines and dies for polymer processing. For practical applications the following summary of the relationships was found to be useful.

11. 12. 13. 14. 15. 16. 17. 18. 19. Birley, A. : Physics of Plastics, Hanser, Munich 1991 Rao, N. : Polyethersulfone in Engineering Thermoplastics: Properties and Applications. : James M. Margolis. : Designing Machines and Dies Polymer Processing, Hanser, Munich 1981 Brochure: Advanced CAE Technology Inc. 1992 Proceedings, 9. Colloquium, IKV, Aachen 1978 Rauwendal, C: Polymer Extrusion, Hanser, Munich 1986. : Kunststoffe 61 (1971), p 421 3 Transport Properties of Molten Polymers The basic principle of making parts out of polymeric materials lies in creating a melt from the solid material and forcing the melt into a die, the shape of which corresponds to that of the part.

1 Shift Factor for Crystalline Polymers The influence of temperature on viscosity can be taken into account by the shift factor aT [4]. 2 Shift Factor for Amorphous Polymers The shift factor O1. for amorphous polymers is derived from the WLF equation and can be written as C2 +(T-T0) where C1, c2 resin-dependent constants T = melt temperature ( 0 Q T0 = reference temperature (0C) The expression for calculating both the effect of temperature and shear rate on viscosity follows from Eq. 12) With Eq.

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