I received this follow-up questions from a previous blog… Milan If I use a reverse profile, could I have problem with melted pellets or trapped air? My Response Basically, the purpose of a higher feed temperature in a reverse profile is to ensure the pellets soften enough to stick to the barrel so they convey […]
Monthly Archives
March 2010
DECOUPLED-I vs. DECOUPLED-II Process…
I received this question the other day… Rafael In a D1 (DECOUPLED MOLDING 1) process the first stage is filling and packing, yet a D2 process isolates filling in the first stage. Could you please explain the difference? My Response In a D1 process, the mold cavity is completely filled using velocity controlled first stage. […]
Purpose of Reverse Temperature Profiling
I got this question and felt it would make a good discussion on the blog… Larry Where and why is a reverse profile barrel temperature used? My Response A reverse profile is typically used when processing materials such as nylon and LCP. In fact it is quite common for many semi-crystalline polymers. Basically, such polymers have […]