This question highlights the complexity of polymers… Saeed I came across a troubleshooting guide for oversized parts and one of the remedies was to increase the mould temperature. Now I understand it will help shrink the part to the required size, but one thing I do not understand that due to higher mould temperature, melt […]
Monthly Archives
August 2012
Inconsistent Screw Recovery…
This question came in as a follow-up to a recent post. SA Recently we were processing Acetal material with black masterbatch. During the whole run the screw recovery time kept going up excessively before coming back to normal values after a few minutes. This was repeated throughout the run and it happens on this particular […]
Old Notions of Training…
I recently encountered this comment… Manager We tried some training back in the 90’s and it helped a little, but no-one remembers any of it now. My Response What was being taught 20 years ago is now very outdated and not considered industry best practice. At that time, the industry standards were very different than […]
Clamp Open Position…
A recent blog reader send me a question last week… Reader We have recently come across multiple part issues relating to end of arm tooling damaging the part. We’ve found that a few of our {brand removed} machines have a lot more platen drift than our other machines. We tried setting our mold open tolerances tighter […]
Traditional Molding…
I was asked this question recently… Technician I am told that short-shot filling with our older, open-loop, machines will result is more variation not less. Why is this the case? My Response Older, pressure-controlled molding machines have no control over the material shear rate. Since the uses a set pressure, any attempt to short shot by time […]