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does injection pressure increase the pressure at the cavity when the cavity is not filled? My understanding is that until the mold is filled completely and plastic can move around, the injection pressure will be higher than the pressure inside the cavity. When you say injection pressure, where and how is it being measured?

54768 Wyman Club

it's so refreshing to see it in the industrial sense. I've really only seen them in academic labs. Very helpful video to get out of the academic bubble.

Terry Divide

7704 Will Inlet

The saddest thing is that eDART is retiring after 20 years in the industry and in 2024 there are still companies around the World like mine that have no idea about it and no injection mold has even a single sensor placed in the cavity...

Where can I buy this device for melt temperature measurement?

1st step is to look inside the mold for and plastic stuck or crushed.

I can't get my white to melt in lense mould using advance400 mixing uv protection and white never had an issue before someone fiddled

Hi. Any in depth intros to molding and how the different machine parts work? I'm still very new to this and I have a job in a mold room. Still a bit Greek to me. Thank you!!1

This was super helpful

Good job, enjoyed your story telling to convey knowledge

If the orifice on the mold sprue bushing is 7/32nds and the nozzle tip orifice is 5/32nds would this be suitable or cause an issue with injection pressure?

Hello sir, can I talk with you about injection molding machine

Answer.. parts out of spec?

Thanks for useful sharing. How can we measure melt temperature with IR thermometer?

Definitely some good ideas but this only covers the basics and i know you said simple but the mold design is pretty simple. Some molds take a very long time to properly clean especially if there are multiple injection units and many different core positions to be set once clamped depending on how often you are cycling a press too it will not matter how often you try to clean the tool to prevent corosion or rusting is a definite enivitablity at that point you need to have a good tool shop to properly pm the mold internally there are just some things you cannot prevent due to mold design and your just going to have to pull the mold to be worked on

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Amazing video!!!

Not enough clamping pressure. Mold to hot or possibly over hesting of the nold. There are so mwny variables eheb it comes to plastics that's why i love it. Actual mold damahe cojld cause flashing too

Great video. Does using larger diameter channels help or hinder If you have a large mold with 1/2npt lines and 1"npt baffles, vs 3/8"npt channels and 3/4" baffles. Some of my customers want bigger holes but if you can't feed it with proper gpm/pressure, the flow may not be strong enough. I notice on North American molds, it's always big lines, 500 series fittings and 3/4 id hose. Then I saw Euro and Asian molds of similar size and it's 10mm water lines with smaller clear plastic hose as they can't use same type of hose we have in NA

they're great!

😊

interesting! what's the difference between specific and back pressure?

Video is very helpful, thanks. I have a question though, Duponts nylon guide says to use the maximum pressure for the holding stage. This bottoms out the screw though. Or if I increase the shot size too far I get flash. Should I not use such a high pressure?

Another thing i have seen is guys increase the shot size when the shit goes short and i have to fix the fucking nozzle leak plastic everywhere!

Flash could be caused by a lot. Over venting the mold, big shot size, barrel heates too high, or mold damage/tool damage. Shorts are usually just not a big enough shot but usually if you are short on one side and flasing on the other there is a problem with the mold or how the press is leveled.

You forgot the real reason for Back Pressure - air will travel to the area of least resistance - no bp - air goes to the front of the screw

Clamp tonnage not set right and mold cooling working correctly will cause flash....now is the die-height set correctly is your lockup position correct. Do you have a broken tie-bar and is the mold there damage causing the flash?

Please make a detailed video that how a molding machine works …like each step …injection pressure ,injection speed ,injection position in barrel ,screw recovery back pressure suck back

Sir u mean we should fill the part by using two profiles?

Poly is easy to mold. Try 14 inch cpvc sch 80 tees 😅.

Sad times, I will miss the edart

excellent explanation, thank you

thank you for your presentation. I would like to ask you, what do you recommend to use instead of safety couplings?

why dont you do one course in algeria ? alot of people here are interessted in the injection machines

I never was a big fan of flash… kind of a wimp, only power he had was speed, but Superman was just as fast if not even faster

Great video. Just wondering why there is 2ejection cycles instead of one?.... lol

We call them cams. Never heard of a slide.

Ahh perfect. Building a machine myself and this was a question ive had that hasnt been well answered or addressed. Thanks

Too much hold pressure or hold time will cause flash also incorrect shot size and not enough tonnage

So after that semi confusing information you advise to not adjust backpressure? All that nonsense about 'drying the material' via the back pressure setting was just added confusing drivel too. Hygroscopic material needs to bd suitably prepared and conditioned pre moulding, end of. Backpressure is purely an adjustable parameter to ensure consistency in melt preparation. Multiple factors can add inconsistency, wear, polymer, additives and environmental changes. You should use scientific optimisation to determine the ideal backpressure for each and every product you trial/run. Once the process is optimised and passed IQ there is no reason to adjust backpressure (or anything else for that matter) as any defects witnessed at this stage during normal production will stem from an underlying issure that needs revolving NOT by adjusting machine settings. Setters/techs - Dont piss about with machine settings if production was running fine beforehand, examine route cause first. Only once everything has been tripple checked should you consider batch to batch material variation and make minute changes to settings while informing your process engineer.

this video was very informative , didnt know that you had to grease the leader pins . Could you use alchol for an alternative cleaning solution for the mold .

How long does resin needs to dry before going into production.

Excellent lecture.

Hi sir, background noise disturb a lot.

Hi there, we are mold maker in Shenzhen China, please contact us if need make injection molds.