Manufacturing
Mould Flow Analysis: A Practical Primer for Designers
5 min read•4 February 2026•Yetki Engineering
Why mould flow analysis catches expensive tooling mistakes before steel is cut — and the five issues it routinely prevents.
What mould flow analysis actually does
Mould flow analysis simulates the filling, packing, cooling and warpage of an injection-moulded part inside a candidate mould. The output is a heat map of what will go wrong — and where — before any steel is machined.
Five things it routinely prevents
Mould flow studies pay for themselves on the first tool revision they avoid.
- Short shots in thin-wall sections
- Excessive warpage from uneven cooling
- Weld lines in cosmetic surfaces
- Hot spots that shorten tool life
- Sink marks at thick-thin transitions
When to run it
Run mould flow during the CAD freeze stage — after the part is mostly defined but before the tool design is locked. Late-stage flow analysis still helps, but it can only confirm decisions that have already been made.
#mould design#injection moulding#DFM
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