Injecting plastic parts - fault diagnosis and problem solving

When injecting plastic parts and components, it's inevitable to get faults, defects and issues. You must have a robust, stable, controlled process to prevent this as much as possible.

If any injected part has been previously produced satisfactorily and it now goes wrong, something has changed. The main principle is never to change conditions immediately. The cause / reason should be identified and rectified.

Never adjust one condition to compensate for a failure or change in another condition.

For example, if melt temperature has increased, don’t reduce speeds or pressures or mold temperature to compensate. Identify the problem, that is to say reduce melt temperature, check and replacing thermocouples, etc. in order to get melt temperature back to intended.


Ask yourself questions:

Identify causes of defects:


Problem solver:

Now we'll use some method and help you solve the most common problems and issues that might show up when injecting plastic parts. Some are due to the process itself, but some come from mold issues and even from as early as part design and project!

Please find bellow comprehensive links to MoldPlast's technical and very concise troubleshooter for the injection of plastic parts and components: