I received this question during a seminar last week… MH When you suggest including everyone in the injection molding training initiative, are you suggesting I include my quality technicians? My Response Definitely, the more quality knows about production, the better off you are. They usually don’t need to know all the technical information… but an increase in knowledge will always […]
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Routsis Training
Common Gate Sizings…
One blog reader asked this question… Larry Would you please give me the guidelines for runner and gate sizing with respect to nominal wall thickness? My Response Below are some common guidelines… An edge gate should be approximately 1/3 of the part thickness at the mold cavity. The fan and flash gate should taper […]
Back Pressure Setting…
I received this follow-up question the other day… Kevin Once I optimize my rear temperature, what back pressure should I use? My Response Back pressure serves two important roles… 1) to help ensure proper material mixing. 2) to help ensure a homogeneous melt compression in front of the screw. Your back pressure should be high enough to provide […]
Using Shut-Off Nozzles
In a recent seminar, I was asked the following question… Participant We often use shut-off nozzles to prevent drooling, are there any other reasons I should use a shut-off nozzle? My Response Shut-off nozzles are a great resource to a technician. When processing low viscosity materials, they can reduce the need for excessive decompression. They can also […]
Identifying A Pressure Limited Process…
This question highlights a common point of confusion… Bob How do I determine if my process is pressure-limited using my machine’s pressure curve? My Response The pressure limited process will have a plateau on the pressure curve prior to transfer. This will also correspond with a drop in the velocity at the time of pressure […]