In the previous two tech tips, we began a three part discussion on how our industry looks at the viscosity of a polymer. We reviewed capillary rheometers and melt flow index machines up to this point. We pointed out various benefits and flaws for each method. Now we are going to take a look at a newer approach to evaluating a polymer’s viscosity called Therma-flo™.
Tag Archives: tech tips
The Tech Tip about Tips
For this tech tip the focus will be on the actual hot tip itself which will include those tips used in full direct gated hot runner systems and hot-to-cold runner systems (one or more hot drops feeding a cold runner system).
Sizing Up Your Runner System
The topic of runner sizing always comes up during our plastics education courses. Everyone wants a magic formula for sizing every runner for every mold regardless of machine capabilities, pressure to fill the part, cycle time requirements and packing. So let’s take a look at various methods people use for sizing runner systems.
“Of all the training seminars that I have attended over the past 10 years, this one ranks at the top! The explanations of clamp tonnage, cooling strategies, viscosity, and key mold design components are just a few of the takeaways that will be very useful in my job function.”
“I was amazed at the amount of expertise and knowledge presented in just two days. Many myths were debunked, numerous scientific explanations for the way we should be thinking about plastic flow were given, and various real-world examples were used to show how plastic flows.”
