Out of curiosity, you say you will be making parts that weigh 25 lbs if I am reading your email right, and then the molding machine sizes are between 1250 to 1600 Tons. What size barrels/injection...
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Out of curiosity, you say you will be making parts that weigh 25 lbs if I am reading your email right, and then the molding machine sizes are between 1250 to 1600 Tons. What size barrels/injection...
You should be able to add images and videos using the buttons above the message box to your messages. 471 See attached image.
Horeki,
It looks somewhat like a voids are forming in the base of that cup and the layers of plastic are separating from each other. You said it only occurs after running non-stop for 100 hours....
I assume that your tooling is on a PM schedule. It's possible that previously it ran at a lower tonnage as you stated that seemed to fix the issue. But documenting the correct tonnage and putting the...
Saeed,
I agree with Rick on verifying the barrel utilization. Make sure you don't have too long of a residence time with the material.
Have you tried running different tool temperatures for A...
I would also throw in that before starting the mold up it might be worth purging out the manifold with fresh material just to make sure the material left in the manifold and drops are not degraded,...
I agree with Suhas, replacing it would be better than trying to "save" it. You are asking for more trouble than it's worth.
pshavela,
Can you either provide screenshots of the injection and recovery page (if separate) or just the values to the settings and outputs below.
Shot Size
Transfer position
Cushion
Screw...
Here is a slide that I put together for our operators to explain each of these settings. Take a look and if you have any other questions let me know. Just remember you must use the real time window -...
Joe,
I used Larger tonnage Haitians for about 2 years. 1100 to 1400 Ton Range. These machines ran well for the most part, actually running better than our Engel presses as far as less maintenance...
Gefran has an instrument called Sensormate. It's a set of strain gauges that attach to your Tie-Bars using magnets. These sensors will measure the stretch of your tie-bars and based on the diameter,...
I would say anywhere between 5 to 10% from lot to lot for engineering grade resins is common. Commodity resins may have potential for slightly high variation, maybe upwards of 15% depending on the...
Jshoe,
Here is a list I had compiled about a year ago of common resins and High and Low Tonnage factors, these are all Tons/sq. in.
For your TPE question, Depending on wall thickness and what...
Brent,
That would be correct, assuming the the mold height was set properly for the new tool that was put into the press.
1. To set this, clamp tools into press.
2. Close the mold in setup...
Moldingppm - more of a general question on the legitimacy of the resin manufacturers, I only look at these sheets for a baseline of recommended temperatures, however sometimes I find this is...
We recently had a new manifold built for an existing tool. During the startup of this new manifold we had issues with stringing from the drop to the back end of the runner, picture attached.
The...
Suhas,
That is exactly what I was thinking, these guys probably send there resin out for physical testing, and that molder will give them back this arbitrary information that doesn't mean a whole...
Hi all,
Something I have wondered for awhile now, when a resin manufacturer has their recommended Back Pressure, why do they specify in PSI and not PPSI. It is hard for me to believe that they...
Down,
I would definitely agree with Suhas with going and taking classes at RJG to learn what all of the pressure curves mean when looking at a graph. I'm assuming based on my experience that you...
Hendrich,
It sounds to me what you are experiencing is your process may be becoming unstable due to your machine becoming pressure limited. When dealing with your pressure setting, you need to...