You can purge out the machine and aim the laser at the purge. The downside to this is the setting for the reflectivity of the plastic. The IR gun can give a reading that is not always 100% accurate (although it is often close enough). The positive of using an IR gun is the safety and repeatability of that technique.
that cup idea is a good one!!, also why not have an auto temp system ie like an auto loading 16" gun on a ship, have this plug go in front of the mould area automaticially, take the temp, then go back to "storage", and have these integrated into the injection machine itself; ie as part of a mould or plastic medium change process, in the controller's routine, and also perhaps have a printer, to print the results for QC purposes. or if this is too expensive, have the cup engineered on a rod, like the blade of a shovel, giving a safer access to this measurement, having a good clearence between your hands and the small space in the machine, NO risk of a Pinch or exposure to hot plastic :-)) and as a side benefit, it guides the plastic into a container, making cleaning operations a lot better, less dross on the externals to clean after a plastic change.
Very good video. One concern on the purge cup. when the melt was purged onto the cup, it will immediately cool when the melt touch the cold cup. so my concern is that the temperature measured by the probe will be a little lower than actual?
We found that with smaller shot sizes, that is true but the advantage is the repeatability. One ounce shot size or larger we did not see the temperature read lower.
What could one expect the melt temp for PE to be if all, except the feed zone, the heats were set to 480F? The screw is 160MM in diameter and the shot weight is 15 lbs. The melt temp I did yesterday on a full shots worth of purge was 350F. Does that seem normal? Issue I am having is brittle parts.
350 degrees fahrenheit is on the low end for PE and could cause brittle parts. A few questions: Did you measure the melt after the press has been running and at the normal process settings or do you load the barrel and the purge out to take the melt temp? If you just purged the machine then the reading will always be low. I would not be surprised by the actual reading being different than the set point but what you described is a bit extreme. Could the barrel or screw be worn? What type of screw is it? There are many things that could cause the problem described. We do offer onsite consulting and training.
@@rjg Hello, excuse me but could a similiar situation of brittle parts happen with Polypropylene? We're currently working with a median temperature of 375 F for all sections of the machine and recently received word that the latest batch was breaking during assembly (the part has 0.117 in. Thickness)
Can you use this process melt temperature measurement plate instead of RJG purge plate to measure the air shot fill time and peak pressure at Xfer to do the load sense study?
Normally keep all the settings the same. Sometimes the cardboard can be wedged so it will stay up near the locating ring. Remember, if you are purging out very large shots, the cardboard may not even be necessary.
Consistency is the most important thing no matter what method you decide to use. We don’t really teach to preheat the probe with a torch anymore due to things getting melted like machine controllers and other expensive stuff. We recommend using a fast response probe instead. Preheating isn’t a bad idea, it can just complicate things sometimes. If you check the actual melt temp, your ahead of the pack no matter how you do it.
Great job Jason. You were the teacher of my Master Molder I in 2017. Loved every minute of it.
Dear sir
Very relevant...
Thank you
Lots of love from India
Great Job Jason!!
Thanks for useful sharing. How can we measure melt temperature with IR thermometer?
You can purge out the machine and aim the laser at the purge. The downside to this is the setting for the reflectivity of the plastic. The IR gun can give a reading that is not always 100% accurate (although it is often close enough). The positive of using an IR gun is the safety and repeatability of that technique.
that cup idea is a good one!!, also why not have an auto temp system ie like an auto loading 16" gun on a ship, have this plug go in front of the mould area automaticially, take the temp, then go back to "storage", and have these integrated into the injection machine itself; ie as part of a mould or plastic medium change process, in the controller's routine, and also perhaps have a printer, to print the results for QC purposes. or if this is too expensive, have the cup engineered on a rod, like the blade of a shovel, giving a safer access to this measurement, having a good clearence between your hands and the small space in the machine, NO risk of a Pinch or exposure to hot plastic :-)) and as a side benefit, it guides the plastic into a container, making cleaning operations a lot better, less dross on the externals to clean after a plastic change.
Great video! Thank you Jason
Thanks for watching!
Very good video. One concern on the purge cup. when the melt was purged onto the cup, it will immediately cool when the melt touch the cold cup. so my concern is that the temperature measured by the probe will be a little lower than actual?
We found that with smaller shot sizes, that is true but the advantage is the repeatability. One ounce shot size or larger we did not see the temperature read lower.
Nice video and I will like to know where to get the purge plug from.
Hey, thanks for watching! You can purchase it here: www.plasticmelttemp.com/
good evening! I liked the video, but it would be interesting to see a video about the correct start of the machine where to start.And so thumbs up)))
Thanks for the comments! Stayed tuned for more videos.
@@rjg thank you! waiting for
What could one expect the melt temp for PE to be if all, except the feed zone, the heats were set to 480F? The screw is 160MM in diameter and the shot weight is 15 lbs. The melt temp I did yesterday on a full shots worth of purge was 350F. Does that seem normal? Issue I am having is brittle parts.
350 degrees fahrenheit is on the low end for PE and could cause brittle parts. A few questions: Did you measure the melt after the press has been running and at the normal process settings or do you load the barrel and the purge out to take the melt temp? If you just purged the machine then the reading will always be low. I would not be surprised by the actual reading being different than the set point but what you described is a bit extreme. Could the barrel or screw be worn? What type of screw is it? There are many things that could cause the problem described. We do offer onsite consulting and training.
@@rjg Hello, excuse me but could a similiar situation of brittle parts happen with Polypropylene? We're currently working with a median temperature of 375 F for all sections of the machine and recently received word that the latest batch was breaking during assembly (the part has 0.117 in. Thickness)
Excellent!! Amazing info, im very interested in getting one of those fixtures, where can i buy it from? Again. Thanks a lot, great vid.
www.plasticmelttemp.com/
Can you use this process melt temperature measurement plate instead of RJG purge plate to measure the air shot fill time and peak pressure at Xfer to do the load sense study?
I suppose so, then you can get the melt temp at the same time. Thanks for watching!
and also interested in the topic of cooling the mold
Hi when you purge on the cardboard do you lower the pressure and speeds or keep as set?
Normally keep all the settings the same. Sometimes the cardboard can be wedged so it will stay up near the locating ring. Remember, if you are purging out very large shots, the cardboard may not even be necessary.
Where can I buy this device for melt temperature measurement?
You can purchase this here www.plasticmelttemp.com/
Jason are you my cousin?
30/30 method not longer use?
Consistency is the most important thing no matter what method you decide to use. We don’t really teach to preheat the probe with a torch anymore due to things getting melted like machine controllers and other expensive stuff. We recommend using a fast response probe instead. Preheating isn’t a bad idea, it can just complicate things sometimes. If you check the actual melt temp, your ahead of the pack no matter how you do it.