https://www.avient.com/sites/default/files/2020-10/luxury-closures-gravi-tech-design-guide-2.0-application-specific.pdf
FOUR MAIN PLASTIC VARIABLES
Flow Rate
Plastics are a non-Newtonian fluid, therefore,
with a higher shear rate, the viscosity of the
material is reduced.
The relative shear rate
is determined by the fill time.
A faster flow rate will decrease
the thickness of the frozen layer.
https://www.avient.com/sites/default/files/resources/Overmolding_of_Thermoplastic_Elastomers_Engineered_solutions_for_consumer_product_differentiation.pdf
Depending on the wall thickness of the elastomer and the substrate, the
production rate can be very high.
Figure 3: Rheological behavior of Over-molding TPEs
The viscosity is in the lower end of the spectrum as shown in the figure 3. in high shear rate regimes.
Figure 9: TPE Overmold creates value in Hand Tools Ergonomics
Electronics/Office Equipment: TPE overmolding in this market area is growing at a rapid rate.
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