Hello,
We are setting up to do some process development on a tool. We have not been to able to figure out why our injection pressure is peaking around the same position during injection...
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Hello,
We are setting up to do some process development on a tool. We have not been to able to figure out why our injection pressure is peaking around the same position during injection...
Hello all. We acquired an old press and tool from our customer who has asked us to re-qualify the process. Currently working on the viscosity study and having a bit of trouble (maybe machine...
Sorry all, it has been a crazy month with furloughs at the plant and I am just now getting back into work!
Suhas, we do not purge through the manifold before starting. After the press shuts down...
Factors to consider
1. Location of closest service technician
2. 24/7 service if available
3. Location of spare parts
4. Spare parts list at that location
In my experience KM/Netstal have...
Hello,
We are seeing what our team calls embedded bubbles and were wondering if anyone has any insight or experience.
Cavities: 64
Material: PET
Delivery: Direct Valve Gates
If you...
Thank you Suhas!
Hello all!
We are molding HDPE lids with an electric press. The material recommended back pressure (and everywhere online) says 50-150 psi for back pressure. I was under the impression that this...
Thanks for replies!
I did some processing this afternoon and hope my findings can spark a good discussion!
It might help to explain the graphic. The red line indicates the injection velocity...
This is a hydraulic injection unit.
Hey all!
I’m working on a new valve gated hot runner mold and have reached the Cosmetic Process Window study to determine appropriate pack pressures.
Transfer pressure is around 17,500 psi
I...
Thanks for the input.
I just looked at several process sheets for our current machines running and we have fill time as a critical to quality validated parameter.
Plenty of times I have talked...
Here is an example of a rheology study and the parts made at each speed.
407
Hi all,
I just finished reading the Optimization of the Injection Phase - Rheology Study and found myself confused
The procedure is to establish a 95-98% filled shot at close to the machines...
Back again to get some processing advice :)
I have been working on processing a few new test tube molds and was wondering if anyone has any input on how to eliminate a visual defect I am seeing at...
Thanks Jay! The images show the profile for the injection phase and then the pack that might be useful for you to view at a later time.
High Injection Speeds - The faster the injection speed, the...
Hi all!
We had an applications engineer in last week for a new mold and machine we are working on. Upon viewing our current process, he recommended we adjust our injection velocity in order to...
Hey all!
We have been divided!
Today our team was having a discussion about the proper short shot of our 100mm test tube (and various other lengths). Team Wavy Tube vs Team Cosmetically...
Sorry for the delay! We are running a 96 Cavity Valve Gated Hot Runner and material is from one dryer and has a minimum of 4 hours of drying. We tested the material for moisture and we were...
Hello all! It has been too long since I have been on to post any questions/responses.
Today I was taking pictures of PET tubes with extra back lighting for our quality department and they...
From my experiences over the last few months - not so great on the service end.
Our team here won't even consider them for future machines for this reason alone, and I believe our other plants...
Hi all!
I have been troubleshooting a 96 cavity valve gate hot runner tube mold and have become a little confused on the functions of the mold gate (which I am assuming is the valve gate).
In...
Thanks Chris!
By ramping to zero, do you mean adding a second stage to my holding pressure such as:
Stage 1
Velocity: 1 in/s
Pressure: 10,000 psi
Time: 1 second
Stage 2
Hello all!
I pulled an injection graphic as well as the pack/hold in hopes of getting an explanation of what is happening. We have 4 identical machines and molds, but each graphic looks...
Hi all! I hope all is well.
I was doing a study today to see the effect of process parameters on a “bubble” defect in PET tubes. I say “bubble” because I’m not sure that I can call it trapped...
Let me know what solution works for you! I believe some operators here had the same issue. I will ask them next week if they ever resolved the issue.