Category Archives

I received this questions from one of our advanced blog readers… Milan Before I perform the dynamic check ring repeatability test, must I optimize the screw recovery, decompression, back pressure, and feed zone temperature. note: The Dynamic Check Ring Repeatability Test monitors the ability of the check ring to mold consistent short shots by weighing and comparing the part […]

I received the following question in an email yesterday.Since it was lengthy, I have done my best to reduce it to a more concise inquiry… Nathan We have an LCP process where the tolerances for cushion, charge time, fill time, and pressure are very narrow. We are maintaining a consistent cushion with only 0.2mm deviation, yet we […]

I was recently involved in a consulting job and was asked the following question… Project Manager The tooling vendor is charging extra for the mold prints and CAD drawings. Should we purchase these? My Response You should always obtain prints and CAD files from your tooling vendor… even if you plan on using this vendor for […]

I received an interesting follow-up question regarding one of my earlier posts… Steve One of our techs stated that there is back-flow in the barrel. Is this true? How does this happen? My Response Yes, back flow does occur within the barrel in three ways: 1) Material will flow back over the check ring – […]

I received this e-mail from a molder overseas… Nathan We are molding PS 750 (NL)  tubes in an eight cavity mold. When we use a higher mold temperature, part ejection is good, but the parts display sinks near the slides. With a lower temperature, we can mold parts which look good, but are difficult to eject. We […]