I was recently asked this interesting question via email…
Technician
I hear all this discussion about process outputs for injection molding. Is this also important for blow molding?
My Response
Yes, process outputs are important parameters to document. These could include parameters such as melt temperature, coolant temperature, part weight, screw RPM, and flash weight can all be useful.
In the extrusion-blow process, the outputs from both the injection and blow stages can be very helpful in both setup and troubleshooting.
-Andy
What should the finish temp be on the preform as it leaves the oven?
could you please lead me to info that describes each part of the process.
Hello,
There are many books, online courses, and websites which can provide a basic explanation of this. I recommend an online search for ‘blow molding guide’ to start.
-Andy
Good Question,
There is no specific temperature, but typically a profile this is specific to the material, mold, and equipment you are processing. For this reason, there is an average temperature such as 100°C which might be used, but it is very misleading since the range of temperatures would vary between 80-110° along the length of the preform. One of the most important aspects is to ensure you are measuring different locations on the preform at the exact same location each time. A hand-held probe will not give you repeatable, reliable, or useful results.
-Andy