The other week, I received a multiple part question regarding many aspects of materials, this is one part… Nathan Although the 1st stage injection time is the same, the virgin PC/ABS (<0.06% moisture) has a 1RMPa higher peak injection pressure than virgin PC/ABS (0.08% moisture). Is this change in pressure common? My Response Moisture in the polymer causes hydrolysis to occur. As […]
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Routsis Training
Determining Intensification Ratio Using Specifications…
I was asked this question during an on-site visit earlier this week… Technician I know this machine is rated with a maximum injection pressure of 38,000psi, but I am not sure how to convert this to an intensification ratio. note: The intensification ratio is a factor which is used to convert the hydraulic pressure being applied to the […]
The Importance of Consistency…
Many processors often experiment in training without a clear-cut goal. One year, they might send some people to a seminar, another year, they might buy some products or try making something themselves. Develop a Structured Approach Although most industry training has some merit, you need to develop a structured approach. For instance, if one form of training turns out to […]
Attribute Data vs. Variables Data…
I have often encounter confusion on these two terms when talking to molders… Attribute Data Attribute data has two different outcomes. An example of such an outcome would be a GO / NO-GO gauge which is used when testing parts. This test results in only two different outcomes, Pass or Fail. Variable Data Variables are […]
MW vs. MWD…
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 […]