Hello Rob,
It could be one of the following:
1. Your back zone temperatures are too low or too high both of which is making the pellets and/or the plastic slip.
2. The back pressure is again too...
Type: Posts; User: Suhas; Keyword(s):
Hello Rob,
It could be one of the following:
1. Your back zone temperatures are too low or too high both of which is making the pellets and/or the plastic slip.
2. The back pressure is again too...
Hello,
How about proximity switches? But these need good adjustments.
I like thin switches since they are mechanical and so 'sure'.
-Suhas
Sorry, if I misunderstood.
What are p4072 and p4055? What are the output names?
Thanks
Suhas
Hello,
All 'modern' machines, say in the last 20 years made by reputed makes such as Arburg are closed loop machines. So you may set the value to 2000 bar but the machine will only take what it...
Hi Joe,
What did you find out here? Just curious.
Suhas
Hello,
That is interesting. You have done good analysis here. It just looks like a case of incompatible additives. I am not sure what advice I can give you but it is best that you show your...
Hi,
That is an interesting observation. I have not seen that but I have always heard the large machines creak and make noise during injection.
Sorry, not of much help.
-Suhas
Hello Ken,
Zero draft is tough (almost impossible) for such long tube lengths! I am assuming the tolerances are tight also. If you find the right grade with a release agent it may be possible at...
Agree with ijchan above. Can you put an analog gage and check?
Wow! I learnt something from Rick. Those are some good suggestions. Did not know about POM - Copper. Thanks.
Just to answer one question about POM - POM bonding,: Yes, they will bond well. It is...
All we are trying to do is to reduce speed and pressure to check if it is influencing the diameter reduction. So so reducing speed and pressure may help.
Just thought of this: This can also be a...
Hello,
I hope someone can answer your question here. We are all into Injection Molding primarily.
But with my experience in Injection Molding, I am not sure if you can get good gloss via blow...
Hello,
It could be that your metal insert is not thick enough and cannot withstand the plastic pressure causing it to collapse. Try to see of you can decrease the speeds and pressures and the...
Good Q!
> MFR testing is very subjective. Each person is going to get a different result since there are a lot of variables. Even the way you pack the pellets will make a difference.
> Agree...
Hi Josue,
For PP, set it to around 150 to 200 deg F. Actually for most plastics, that is a good range.
-Suhas
Hello,
This could be a processing issue, you need better mixing. Try:
1. Increase the melt temperatures
2. Increase screw rotation speeds
3. Increase back pressures
Let us know if any of this...
Hi Joe,
I do not know the names of any companies but there are several of my clients who use these with good success.
Regards,
Suhas
Hello Hassan,
Where is the gate?
Is the crack in the same place all the time?
Suhas
Hello,
This is does to post mold shrinkage. Can you try to overmold the parts one or two days after you mold the substrate (1st part)?
Let us know.
Suhas
Hi,
Those pressures provided are hydraulic pressures. What does that translate to in plastic pressure?
For PBT, mainly work with pack and hold pressures. Are you sue the gate is sealed? Do a gate...
Does the mold have springs?
Do you have the ejector tied in? Or are they just push?
-Suhas
Hello,
1. Do you see that issue only with Nylon?
2. What is the back pressure?
3. On the JSW there is (or at least there was) a high torque and low torque setting. Have you tried using both...
DM1977,
All very valid points above.
Also try raising the zone temp next to the feed throat - in fact in the feed zone of the screw and see if that gets better.
Let us know.
Suhas
Yes, you will need to calibrate it. However, if you have not have much experience with it, it is well worth to get the KM Tech to do it.
Suhas
Hi,
When I worked in maintenance (a long time ago) I found out that since the screw turns always in one direction, that is how it would also turn to tighten something. If not, it would come lose...