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What is the filling pattern?
The filling pattern is the transient progression of the melt front within the delivery system
and mold cavities. It plays an important role in determining the quality of the part.
Melt front velocity influences filling pattern
Constant MFV
The ideal filling pattern has melt reaching every extremity of the cavity simultaneously, with a
constant melt-front velocity (MFV) (see Chapter 3) throughout the process. Otherwise, localized
over-packing at prematurely filled regions might arise within the part.
Variable MFV
A variable MFV during filling also leads to changes in the molecular or fiber orientation that
immediately freeze at the part surface region when the molten plastic contacts the cold mold.

FIGURE 1. Computer-simulated filling pattern in a color-shaded image