Weight only after each shot
- Slow iteration when viscosity drifts
- Harder to diagnose fill imbalance
Glossary
What Is Cavity Pressure? Injection Molding Explained
Cavity pressure is melt pressure measured inside the mold during injection and pack.
Glossary
Cavity pressure sensors measure melt pressure inside the mold during fill and pack
High control programs use profiles to lock repeatable fill and pack windows.
Sensors in the cavity capture peak and hold pressure signatures shot to shot.
Scientific molding teams compare profiles when tuning pack before gate freeze.
Standard production quotes focus on part quality requirements unless RFQ asks for in mold data.
Glossary
How cavity pressure shows up on real programs
Library photos illustrate molding and tooling context for this term.
- Use the term in RFQs with geometry and material context, not in isolation.
- Link to the design guide when the term affects steel or part design.
- Upload CAD when the term changes tooling scope or piece price.
Control
Part weight tuning versus cavity pressure profiles
Data reduces guesswork on sensitive programs.
Cavity pressure guided setup
- Repeatable pack window when sensors are placed well
- Better documentation for high control RFQs
Go deeper
Where this term connects
Each link is a different angle on the same program, not a duplicate definition.
Scientific molding
Broader data driven method.
Scientific moldingProcess capability
Capability after stable profiles.
Process capabilityGate
Gate freeze ends pack influence.
GateValve gate
Timed drops affect pressure traces.
Valve gateVisual reference
Photos from molding and tooling programs
Images are selected from the NetProto Forge media library for this topic.
Injection molded production parts on a tray
Injection molded production parts on a tray
Engineer reviewing a molded part drawing
Engineer reviewing a molded part drawing
Plastic housing components from a steel tool
Plastic housing components from a steel tool
FAQ
Cavity pressure questions
Do buyers need cavity pressure data?
Usually only on high control programs defined on RFQ.
Can sensors be added after T1?
Retrofit is possible but costly compared with planning in steel.
Does cavity pressure replace FAI?
No. FAI still documents part dimensions versus drawing.
Next step
State stability needs on RFQ
Upload CAD and SPC requirements when in mold data is expected.