Troubleshooting Short Shots
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- Опубліковано 25 тра 2024
- What causes short shots? And how can you determine the root cause? Jason walks through some troubleshooting techniques to help determine why short shots happen and how to prevent them.
Read a related article on preventing short shots on our blog: rjginc.com/short-shots-whats-...
RJG Training: rjginc.com/training/
#injectionmolding #moldsmart #plastic #shortshots - Наука та технологія
good method but if you would allow me i would like to add that problems are not only coming from the IMM settings. the lack of knowledge on the material handling process (recycling conveying drying dosing blending). If u have a bad dosing and blending then the viscosity isn't ideal meaning to the rheological study which will gives short shot, over pack, void, delamination, cracks, and color defect to name few. Same with drying (u checked and this is good), which is the only auxiliaries that can act of the gas related issues. Indeed, gas can creates also short shot. People will talk about the vent but if u handle the drying in a proper way, u have less gas issue and therefore u act positivily on the gas from the additives. Thermoregulation is also a big factor on how to avoid defects. The problem is that people are not setting the water flow and delta T precisely enough. It always an approximative settings compare to the settings on an IMM.
A good trouble shooting method. I use a checklist, the same way that a pilot does a pre flight. that way, nothing left to chance. So before any knobs are twisted, and changes are identified.
I also ref to 3 independent feedback outputs- cushion position, max cavity pressure, and fill time. Lest hear a 'yay' for the scientific moulding method.
I really like the pre-flight checklist! Make sure to ask the Co-Pilot :) . One suggestion is to reference the fill only weight along with the fill time.
Love your videos! Keep them coming!
We're so glad you love them! Thanks for watching!
I once had shorts hots due to wrong material.
There were two kinds of material bags which looked similar. The wrong bags were used to fill the material bunker. This material was tougher. Hence the short shots.
If you’re not bottoming out on you’re cushion lowering the transfer can get you 90-95 percent on fill only.
Thank you very much
Thanks for watching!
I am a Process Engineer for Infiltrator Water Technologies in Winchester, KY. Does RJG offer training at your facility?
Hi Jeremy, thanks so much for reaching out! Yes! We offer training at our facilities in Michigan, North Carolina, and Georgia as well as online and in-person. You can learn more about our training and contact us on our website: rjginc.com/training/
Sir what could be the reason for thermal gate freezing issue in running machine?
Can i have a take look on your set-up sheet., Cause I'm wonder in my prod. Process we do have several mould wich is the same size and tonnage and also moulded same parts, inj. machines brand, but using the same clamping force.
Could I see an example of a setup sheet? We are trying to figure out if Injection Moulding is a process we could introduce in our company but lack knowledge.
Hello, Peter! We'd be happy to help. If you give us your contact info, we could have someone reach out, or feel free to email us at info@rjginc.com. Thank you! :)
Why the shot size and not work with the transfer position?
Either setting would work but generally the transfer position has less room to move.
Cushion size will be affected by moving transfer position. That I don’t want to mess with!
Poly is easy to mold. Try 14 inch cpvc sch 80 tees 😅.
Common sense is very uncommon
Who changed the shot weight??. Did you check the master setting sheet to the settings of the machine? 😂😂😂