I received this common question via e-mail the other day… MJ I heard that it’s good to have shot size from 20 to 80 percent of the machine’s available shot size. Has this conclusion was tested, or has somebody published a white paper study? My Response Although I am not familiar with studies to validate this specific conclusion, but […]
Category Archives
Plastics Technology
Open Loop vs. Closed Loop Controls
In a recent webinar regarding Process Documentation, I received this question regarding process controls… Frank During an In-Mold Rheology Test, should we use the closed loop or open loop option on our machines? What is the difference? note: For those new to the industry, open loop process control uses a set pressure to force polymer […]
More Accurate Clamp Tonnage Calculations
I got this intriguing question the other day… Jim I am working with a part – family mould 1 + 1. Here’s the scoop: Projected Area: 89.75 “^2 Hold Pressure: 950 psi hyd. Intensification ratio: 13.36 Plastic Pressure: […]
Weld Lines vs. Meld Lines
In a recent conversation, I got this age old processing question… George Some of my techs call them weld lines, some call them meld lines… what is the difference? My Response Both Weld and Meld Lines occur where melt fronts intersect, yet they are different… Weld Lines are formed when two melt fronts meet with […]
The Symptoms Of Machine Dependant Documentation
In a recent discussion with a brand new customer, when discussing common defects he posed this query… Steve K. Although we don’t really have one or two defects we get all the time, but we get a lot of different defects all the time. We run a lot of different molds, machines, and materials… and […]