Heater Band Evaluation

When running the heater band for the first time, we were wondering why it was taking so long to heat up and start melting the plastic. We had lots of smoke and no melting. Doing a thermal analysis of our current set up, its obvious why it takes so long.  This image is if the heater band is set to constant 500 F and nothing else acting on it. This is after ten minutes. The pineapple ranges from 400-500 and the nozzle still is not even close to temp.

The picture shows the comparison between an Al and a 1018 steel pineapple. You can see after ten minutes the Al pineapple has heated up much better. The issue with this design is the fact that the nozzle still is not heated up enough. Even after 30 min (in video), the nozzle and valve are still not to temp. The next test will be with the new pineapple design and see if the nozzle heat up better.

The above video is the current setup, without the nozzle. This video shows that by removing the valve, the nozzle gets to temp in about 10 min. This is a lot more reasonable than the 30+ min it took before. The thought behind removing the nozzle is that when there is no piston pushing the plastic, there might not be any flow. Even a little oozing out would be tolerable.  The picture below is the same setup but with an AL pineapple. The pineapple distributes the heat better and quicker.


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