Hello and welcome to a new post. Today we discuss the topic of melt residence times of high performance polymers in injection moulding.
In a
previous blog post, I presented already a practical way to estimate the
residence time and the online calculation tool can be found here.
Often comes
the following question: I have calculated the residence time of the melt in my
injection moulding machine. And now what should I do with this value? To what
should this value be compared to?
One answer
to this question is that generally, if your estimated shot size is between 30%
and 60% of the plasticizing barrel capacity, the residence time will be in an
acceptable range.
The other
answer is that one needs to know the recommended and maximal residence time
before thermal degradation of the resin takes place. These recommendations can
be often found in the processing guides of the polymer manufacturers.
The figure
below shows the recommended and maximal residence time of selected high
performance polymers for injection moulding.
 |
| Recommended and maximal residence time of selected high performance polymers for injection moulding |
Thanks and #findoutaboutplastics
Greetings,
Herwig Juster
#ResidenceTime #Verweilzeit #InjectionMoulding
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