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Chris,

I think you mean the Dynamic Check Ring Repeatability Test which checks the repeatability and not tightness of the check ring.
I would like to know how you evaluate if the check ring...

Hi,

Long story short, if I want to check if my check ring is leaking (or barrel is the cause but that's not the point) I turn off HR (for example) and then at different screw positions I increase...

Thank you guys for your answers.

I understand electric presses do not deviate a lot under verious loads?

Brent, do the tests show more sensitivity as the machine gets more wear? I suppose it...

And there is this formula for calculation of the load sensitivity:
((FT1 – FT2) ÷ FT1) ÷ ((PK1 – PK2) ÷ 1000) × 100 = % error/1000 psi

How does the formula looks like if I work with hydraulics...

Hi guys,

I have a question to those of you who conduct Load Sensitivity Tests. I have the procedure from here:...

Hi,

I read this article: https://www.rjginc.co.uk/paperclip/uploads/36/original/April_2013.pdf
The article mentions the Price 32-shot technique. Do you know how to use it?

Robert

Rick,
The PA6 melt temperature was 265 deg C - I measured that. None of the resins are glass filled. I played with decompression for PA6, but it didn't work. The one thing that I didn't check was...

Great, thank you!

Hi guys,

One of the setters called me to show that the screw bottoms out when processing PA6. We did a static nonreturn valve test and the result was that it leaks. I repeated the same procedure...

Hi guys,

I read that vents should be located on the movable half of the mold, but cannot understand why... Why not on the stationary side?

Robert

The operating temperature would be room temperature so way below the Tg. That was a theoretical question rather than a real life application.
My thinking now is that if the degree of crystallinity...

Suhas, thanks for the comment.

I am thinking of best processing parameters to make parts with best impact resistance (the material is PA6). If I set mold temperature at let's say 20 deg C then the...

Hi,

I have been thinking recently which material is more impact resistant - the one with higher or lower degree of crystallinity? For example PA6 at room temperature. What does your commom sense...

I wrote it wrong (English is not my mother tongue). I meant that we can dry the material very well, but if the residence time of the material in the hopper (after it leaves the dessicants) is e.g. 5...

Thank you guys for your answers. All your guidelines are very valuable.

I have been 4 years in the industry, but I have noticed many times that people use dessicant dryers with pretty low dew...

Hey MTUHusky,

Thank you for your answer.

BTW, I also noticed that some material suppliers put the same max moisture content for non GF filled and GF filled resins in their TDS which seems...

Many thanks guys!

Robert

Hello,

Do you know some methods to measure flashes on plastic parts (very small e.g. up to 1 mm)? I mean a situation when it is not allowed for the flash to be bigger than x. We used to use a...

Rick,
I think we are on the same page, but to clarify. When I do this test for example on Arburg machines I turn off the pack/hold pressure as well as pack/hold timer, but I need to add appropriate...

Rick,

I am time travelling a bit browsing the old threads.
I think it is a bit dangerous for some machines to leave the time counter on in the pack/hold phase as for some machines it is...

Hi guys,

Simple question, but what methods do you use to check moisture content in your resins before processing? We use the weight loss method, but I doubt this method has been validated properly...

Thank you for replies. Yes, it is a barrier screw. What methods do you recommend to clean it. My maintenance department do not do this so I'm asking. Do you use something else after brass brush?

Hello,

I wanted to ask for help those familiar with processing of EVA. I came across with an issue on parts that are made of natural color EVA. The problem is that with every start-up there is a...