Plastics

Download Design Data for Plastics Engineers by Natti S Rao PDF

By Natti S Rao

Presents a brief reference on easy layout facts for resins, machines, components, and strategies displaying the way to observe those facts to unravel sensible difficulties. Softcover. DLC: Plastics.

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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. lg/i where Q is the volume flow rate per second and R, the radius of capillary.

Charpy notched impact strengths of some plastics as functions of notch radius are given in Fig. 25 [5]. Ductile behaviour Ductile/brittle transition Brittle behaviour Temperature Fig. 24: Impact curve [6] PVC Polyethersulfone Charpy Impact Strength (kj/m2) Nylon 66 (dry) Acetal ABS Glass-filed nylon Acrylic Radius (mm) Fig. 25: Charpy impact strength vs. 8 90 Example [8]: The following example illustrates the use of physical and performance properties of polymers in dealing with design problems.

Pressure of the melt (see Fig. 6) Pressure p R= 1mm R=0,6 mm Pc Capillary geometry L/R Fig. 1: Resin-Dependent Constants c and m in Eq. 614 Shear rate f • s] Pa Shear stress T Fig. 4) Ya and is shown in Fig. 8 as a function of shear rate and temperature for a PE-LD. Viscosity functions for several polymers are given in Figs. 10. Pa-s U X||5O3SI/\ Shear rate j s"1 Fig. 8: Viscosity functions of a PE-LD [2] Shear viscosity of different polymer melts PE-HD (19O0C) Melt viscosity (Pa s) ABS0 (250 C) PE-LD (2000C) POM (21 OX) PA66 (2800C) PP (260°C) PA6 (275°C) PBT (290°C) Shear rate ( s1 ) shear viscosity of different polymer melts PE-HD POM PA66 melt viscosity (Pa s) PE-LD ABS PA6 PP PBT melt temperature (0C) Fig.

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