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Ramp time down for your pack and hold with % of pressure. Its like a pack and hold profile.

How much post decomp are you using and is the screw decompressing back to the same position every cycle? I work with a Husky with 4 injection units and had the issue with inconsistent post...

I currently run a four cavity family tool (PMMA material) in a 500 ton. Two parts are 14" long 4" wide the other two parts are4" long 4" wide all hav a wall stock of 2mm. The hot runner system is...

It can be cost effective! Just make sure the cavities are balanced.

If memory serves me right, I think it was 100 to 150 psi.

Sogeka, using regrind at 40% you defiantly have a difference in melt, the virgin may not be seeing total melt down. I had a similar problem with TPE 50 to 1 concentrate the defect appears as white...

What other types of material and color do you run in this press? The regrind being 1/8" can still act as a purging compound. Do you have allot of fines in your regrind?

I have always used LOTO when performing any work on the machine. All the companies I have worked for use LOTO at the pump motor stop or e-stop. If maintenance is replacing pumps motors or anything...

Can you physically see if the screw is starving? If you increased the hopper throat temp and this improved the inconsistency, you might consider pre drying the material.

Thanks everyone for your time suggestions and remedies. I found the rear zone on one of the machines too hot due to a faulty thermal couple, along with improper shut down. I have implemented a...

Yes that is correct.

One of many problems in the injection molding shop I work in is the screws are getting wrapped. This only occurs with the acrylic material on our new machines that have screws designed for acrylic. ...

I agree with you both! Arturo what is the filler in the PP, glass mineral mica? Is it possible that what you are seeing is degraded material moisture or the filler migrating to the surface.

I work with PC myself and have found that shut down is the key.. I would recommend the screw be pulled and cleaned. You also might try some purging compound. Thru DOE I have found ASACLEAN to be the...