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Posted by admin on July 20th, 2012

Based on a simplification of classic fluid mechanics theory, the injection pressure required to fill the delivery system (the sprue, runner, and gate) and cavities can be correlated with several relevant material, design, and processing parameters. In the following equations, P is the injection pressure and n is a material constant (the power-law coefficient), which typically ranges from 0.15 to 0.36 (with 0.3 being a good approximation) for a variety of polymer melts. Figure 2 shows injection pressure as a function of several of these parameters.

  Circular channel flow 

The melt flow in the sprue, runner, and cylindrical gates

FIGURE 2. Injection pressure as a function of melt viscosity, flow length, volumetric flow rate, and part thickness

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