I was discussing polymers with a technician and was asked this question: John I understand how molecular weight affects the process, but how does molecular weight distribution affect the process? My Response Polymer chain mobility is highly dependent on the length, or molecular weight, of the polymer chain. If most of the polymer chains have a similar molecular weight, or smaller […]
Monthly Archives
September 2011
Open-Loop Molding Revisited…
I have been asked about the proper use of an open-loop molding machines… Customer When implementing DECOUPLED MOLDINGsm, how should we best incorporate our open-loop molding machines? My Response Basically, open-loop molding machines are not capable of this since open-loop molding machines cannot decouple 1st stage filling from 2nd stage packing. These machines lack closed-loop, injection velocity control and inject using pressure control instead. As […]
Mean, Median, and Mode…
I heard a quality technician make the following comment the other day… Technician Mean, Median, Mode… they are all the same. Mean The mean is the average of measurements within a particular sampling. This value equals the sum of all the numbers in a sampling divided by the number of values in the sample. For example: the […]