I received this question as a follow-up to a previous blog posting… YM Is there any standard (ISO or ASTM) that can be reference for a polypropylene spiral flow test? My Response Yes, there is a standard for this within ASTM D-4101. If you are looking to publish the results, then this can be very helpful. Unfortunately, […]
Category Archives
Plastics Technology
Part Sticking and Machine-Independent Documentation…
I received a detailed request for help from a blog reader last month. Below if a distilled rendition of the discussion… Issue The mold has run without issues for years. Now the parts stick in the mold almost every shot, there is more flash, and the cushion is much lower than recollection. All the machine and temperature settings are the same, […]
Rule of Thumb for Packing…
I am often asked the following question… JH What is a good rule of thumb for second stage packing? My Response In the old days of pressure-controlled injection molding machines, the first stage pressure was used to completely fill the mold slowly while a lower pressure (approx. 40-60%) was used to compensate for shrinkage while waiting for […]
Training Certificates…
I received this comment the other day regarding a recent post… Manager Two of our techs recently received training certification, but I don’t see any real change between them and the other technicians. My Response Most certifications are based on the participants ability to pass some tests in a class setting. This process is beneficial in introducing new techniques […]
NPE 2012 Passes…
If you are visiting NPE this April, I recommend you take advantage of our free passes (a $120 value): http://www.npe2012guest.org/?e=314 For more about NPE2012, please visit: http://www.npe.org/ -Andy