The Purpose of Cushion

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 […]

Understanding Back-Flow Within the Mold…

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 […]

Targeting Cushion Size vs. Transfer Position

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. […]

Torque Values For Larger Molds…

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 […]

The ‘Too Busy To Train’ Excuse

I was asked this question during a recent webinar… Neil How do I overcome the ‘Too Busy To Train’ problem? My Response I often encounter this question when upper management does not put a priority on employee training. Many managers will state that employee training is important to them… but often neglect to set aside resources […]