Category Archives

I just received this question regarding a recent posting on my blog… Blog Reader You mentioned pressure loss with respect to the importance of maintaining a consistent cushion, could you quickly expand that thought? My Response All plastics are compressible… therefore there is a compression that takes place with the polymer in front of the […]

I received this question yesterday… MJ Could you explain the phenomena of back-flow inside the mold? I have in-mold sensors, but I don’t think I am seeing this. My Response Basically, there are two areas within the molding process where back-flow typically occurs: 1) Transfer From Fill To Pack: If the mold is completely full during […]

I was recently asked this question… e-Mailer We currently use a target transfer position of 0.25″ for all our processes. to avoid uneven barrel wear should we adjust the our standard transfer to something larger? My Response A standard cutoff is helpful when initially establishing your fill… but you ultimately want to target a percentage of shot size. […]

I received a few follow-up questions from a previous post, so I will address the most common one… JMG I was wondering if you have a chart showing proper torque spec for mold c lamps and bolts for 250 up to 1100 Ton machines?  My Response Sorry, but I do not have such a chart, but […]

I was at a customers facility the other day and they had a problem which is becoming more common with today’s electric molding machines… Joe We bought these fancy, new, direct-drive electric molding machines. Overall, we like them, but we have already snapped three screws and the manufacturer has no idea why this is happening. Do you have any ideas? Note: After further […]