Meaning
Computational techniques that track the progression of molten plastic as it fills a mould cavity analyze the pressure, temperature and velocity profiles of the melt during the filling phase. Mold designers use injection moulding flow front simulation to optimize gate locations and predict where weld lines will form. This digital tool models the non-newtonian behavior of polymer melts under high shear rates.
It determines the flow path boundaries beyond which short shots or burns occur.
Weld Avoidance
Converging melt streams create weak areas known as weld lines where the flow fronts meet. Running an injection moulding flow front simulation identifies these meeting points before manufacturing begins. Moving the injection gate shifts these weak zones to low-stress regions of the part.
Pressure Analysis
High flow resistance in thin sections requires injection pressure that can cause flash or mold deflection. The simulation calculates the required clamp tonnage and packing pressure to ensure complete cavity replication.
Fiber Orientation
The velocity gradient near the flow front controls how glass fibers or polymer chains align during the injection process. This alignment determines the directional mechanical properties of the finished product. Modifying the injection speed alters this velocity profile, allowing the operator to tailor the orientation to resist specific stresses.
