Category Archives

I received this question over the weekend… Ponce What is the right procedure for performing a cavity balance test for a blow molding machine with an injection, pack and hold? My Response Basically, the procedure is similar to that of an injection molding machine. You would turn off the second and third stage, and then compare the shot […]

During an on-site consultation, I was recently asked this question… George When troubleshooting a Decoupled III process for variations in overall part dimensions, what parameters should we investigate. note: A DIII process has many specific attributes, but the key aspects include a velocity controlled 1st stage fill (90%), 1st to 2nd stage transfer by position, velocity controlled […]

Recently, I was working with a customer who was looking to reduce the cycle time of a particular process… Situation In this case, the customer was buying as many parts as the molder can produce. The ejected parts were sub-gated for part removal while the parts are being dropped onto a conveyor belt. Since the material was a TPO, the parts […]

I received a quick question from a molder overseas via email… NG How deep should an eyebolt be screwed in when performing a mold change? My Response Although most bolt manufacturers recommend at least 1.5 times the bolt diameter… I believe threading the eyebolt at least 2 times the diameter will provide a much higher degree of […]

I was recently asked the question… Tom Is it worth investing in a highly conductive mold material like QC7 to minimize cooling time? My Response You can reduce your cooling time a couple ways. The first way to reduce cooling time is to increase your rate of heat transfer. That means you must increase the […]