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I received this question as a follow-up question regarding a different blog, and decided it warranted it’s own entry. MJ Does the screw have the same diameter in the front, middle and back screw flight diameter? My Response The typical injection molding screw has the same outer diameter along the entire length of the screw. When measuring […]

During a recent consultation, I was asked this question… Engineer Could you explain how to pack-out a thin-walled part which requires a large amount of pressure to fill? My Response In such a case, the pressure to fill the part is typically very high… therefor, the pressure at transfer is also high. In such a case, […]

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 […]