As a response to the Fill Time, Viscosity & Molding Economics blog I received this question… E-Mailer With respect to a in-mold rheology test, why should we choose to process on the right-hand side of the curve? My Response As the shear rate, or flow rate, of the polymer increases… the viscosity decreases. This rheological behavior is […]
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Using Hold Pressure Velocity
I received this question from a frequent blog contributor, and believe it makes a good discussion on decoupled processes… Milan On some of our machines, we can adjust the hold velocity. How should this feature be used when molding a decoupled II process. My Response Before I respond, I want to relate the general attributes of […]
Fill Time, Viscosity & Molding Economics
A friend emailed me this great question the other day regarding the relationship between fill speed and pressure… JM The pressure required to fill a particular mold went up from 950 psi at 1 in/s to 1050 psi at 3 in/s. I understand the higher pressure needed to hit the higher speeds, but shouldn’t this be […]
PET Screw Design For Injection Molding
I received this blog topic request yesterday… Samer Concerning injection molding, is there a specialized screw used for PET? My Response Yes, the goal in PET processing is to (1) maximize output, (2) control shear heat, and (3) minimize melt tempertaure… yet ensure the polymer is fully melted and as homogeneous as possible. (1) The need to maximize output is […]
The Pitfalls Of Classroom Training
I was recently asked this interesting question… Customer I see that you teach at a university, are you planning on providing classroom training? My Response Classroom training is not the most effective method available for training your production employees. Some seminars provide 4-8 hours of training a day… which is far too much information to absorb in one week…never […]