STMC Solves PPS Burr Problem with Cryogenic Deflashing

STMC recently helped a customer solve a tough burr problem.

The customer makes PPS injection molded parts.
These parts had burrs on the edges and inside small holes.
Manual deflashing was slow and difficult.
Workers could not reach the burrs inside the holes easily.

PPS material is very brittle.
If you put the parts directly into a cryogenic deflashing machine, they hit each other.
This causes cracks, chips, or scratches.
So STMC designed a custom fixture for each part.
The fixture holds the part firmly in place.
It stops parts from touching each other during the process.

STMC used a double-nozzle cryogenic deflashing machine.
The machine freezes the parts with liquid nitrogen.
Burrs become brittle and break off easily.
Small plastic pellets are shot at high speed to remove the burrs.
Because the parts are fixed in the fixture, only the burrs are hit.
The main body of the part stays safe.

The test results were very good.
All burrs were removed from the edges and holes.
The parts had no damage at all.
No cracks, no dents, no scratches.
The surface quality remained perfect.

This solution saves time and labor.
It also improves product consistency.
Every part is deflashed the same way.
There is no risk of human error or part breakage.

STMC now offers this method for other brittle plastic parts.
We combine cryogenic deflashing machines with custom fixtures.
This works well for PPS, LCP, PEEK, and other engineering plastics.

Do you have burr problems on fragile parts?
Contact STMC for a test.
We can help you remove burrs safely and efficiently.

— STMC: Simple, Safe, Reliable —