Today's KNOWLEDGE Share : How injection speed affects both part quality and mold longevity

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Today's KNOWLEDGE Share

How injection speed affects both part quality and mold longevity


Injection speed is often set based on what works for cycle time, but its impact goes much deeper. The speed at which the melt enters the mold can influence part quality, surface finish, and even the long-term health of your tooling.






Here is why this one setting deserves more attention:


1. Flow front control

A properly managed injection speed ensures uniform flow front advancement, which helps prevent flow marks, jetting, and weld line weaknesses. Too fast, and you risk trapped air and burn marks. Too slow, and you may not fill complex geometries.


2. Shear rate and heat buildup

Higher speeds increase shear in the gate and runner, which raises melt temperature. This can help with flow but also increases the chance of material degradation if not monitored closely.


3. Cavity pressure stability

Consistent injection speed leads to a more predictable cavity pressure profile, improving repeatability and reducing flash or short shots.


4. Tooling wear and erosion

Running high speeds on filled materials like glass-reinforced nylon can gradually wear down the gate or cavity edges, especially without proper gate design and surface treatments.


Injection speed is not just about cycle time. It is one of the few parameters that directly connects process control to both part function and tool life.


If you are seeing cosmetic defects, early tool wear, or weight variation, reviewing injection speed might be a smart place to start. Happy to walk through it if needed.


source : Roman Malisek


#InjectionMolding #MoldingOptimization

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