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The first one pressure response is saying <0.2sec/100bar. Can you clarify why it says divide pressure difference by 1000 for melt pressure, i wonder going between melt and hydraulic should the...

When you say adjustment of the temperatures,is this reducing them?

What i cant understand is, i have very consistent fill only shots, less than 2% variation, but yet when i apply hold pressure the...

Thank you Suhas and Rick,

I forgot to include it in my first post, but this is a hot runner mould
I increased back pressure and still had the same variation afterwards
I hadnt a second slow down...

Hello,
Having some difficulty with a product and melt cushion variation.Spent a long time working on this today, and at stages thought i had a run-able process, only for the problem to return after...

Hi Suhas,
Thanks for your reply, the following would the list of outputs from those
Fill time
Melt Cushion
Plasticizing Time
Cycle Time
Peak melt pressure

As regards to alarm limits i would...

Hi,
Just interested to know what you do as regards process validation.
At the minute i set upper and lower levels of the following:

Hold pressure
Inj. Speed
Cooling Time
Changeover point...

Hi Rick
Where does the compression ratio come from, is the based on the barrel volume/volume remaining between screw flights?
processtech

Hi,
fill is 92%
increased speed along with higher hold and longer hold time show a positive effect on size.
shot weight does increase with lower clamp, but not effecting the dimension in question,...

Hi,
Im back on this again,thank you for your suggestions, sorry for not replying sooner, we moved that mould back to a smaller machine again and with one thing or another i didn't get to look at...

Hello all,
Been a while since i posted on here,
You may be able to help me with a problem i am having with size on a part we mould
It is a round thin wall,flat part approx 3.35 inch diameter ,...

Had a look at those, it has confirmed that my calculations are correct. Is it standard enough to just focus on the lane diameter within the mould and ignore the diameter of the hoses from the stacks....

Thanks for that

Hi,
Thanks for that Suhas, I put those into excel, is that the flow in gpm? that would be great if you could send me that in excel. I have attempted in calculating the Re for the 0.25 diam pipe at...

Thanks for that info brentb, I will look up those tables.
What is the law of diminishing returns?
What I am really looking at is energy efficiency of the cooling process. Why run a larger chiller...

Hi,
In the set up of cooling for a new mould, do you work out the required water velocity ,depending on lane diameter and based on a Reynolds number of 4000.
Can it be that you could be running a...

Hello,
Would set up sheet not need to be provided with validation report for the tool, from moulder to customer?

Hello,
Didn't get back to this thread in a while, Rick what is the NRV,
A different question why would we see sporadic increases in injection time, approx a half of a second increase, nothing has...

It has ran perfectly at those conditions in the past,is it pointing towards a machine issue seen as we get shorts on and off,its an 80 tonne Krauss maffei,relatively new,knocked off hold pressure and...

Hello,
Thanks for the replies.
Temp profile °C, Nozzle 181 Zones, 181,176,176,165
Screw rpm 200, back pressure 31Bar,
Material gls 273-054
Increased hopper throat temp improved the...

Hello, Why would we be seeing a variation in plasticising time of a tpe, approx. 1-1.2 sec variation.Thanks

Hello,Back again with another question, In material specification it may say to dry a material at a certain temperature for a certain period of time. Is there any way you can measure if the material...

Thanks for your reply

Hello,
As a means to estimate the required clamping force for a mould, i am working out the approximate area of the parts, and then getting force by multiplying a pressure by the area. This is where...

Thanks for your reply, Would i neeed to record peak psi though,would that not only be required when completing a viscosity study.

Hello,
Doing some validations at the minute,the one im going to ask about is injection speed linearity,im wondering am i following the correct procedure on this,i turn off hold pressure and time,i...