Скачать или смотреть Plastic Injection Molding - Nozzle Leak - Carriage Cylinders

Today’s opportunity for improvement is correcting a nozzle leak. Specifically, a leakage only during the last few second of holding pressure.

Notice how the cushion appears to hold around .65/.64 then suddenly plummets to zero

The correction for this example, was to replace the carriage cylinders that had bad seals.

A waste of time, would be to change the nozzle tip and/or nozzle body....may sound silly....but it was suggested by someone will a little less experience and would do nothing to correct this issue. Was able to prove that by reducing the holding time by 6 seconds and the problem stopped.

If ever facing a similar issue, you can disconnect the hydraulic lines, close the mold with the nozzle against the mold and using the mold as pressure, see if any fluid comes out of the open ports. This would indicate a bad seal. I may not have worded that perfectly (Not a Mech or Machine Engineer!)