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11th October 2011, 10:43 AM
#1
1st filling ( Injection phase )
During 1st filling ( Injection phase ) , is it right practice to turn off both holding pressure and holding time ?
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11th October 2011, 07:38 PM
#2
When first setting up the filling phase I do trun off the pack/hold pressures and leave the times there so the maching cycle time is consistant. I also start with the initial injection pressure set very high so the process will not be pressure limited. On some critical jobs I record the weight and take a picture of the part with the holding pressures turned off (95% filled). I don't do viscosity studies that often. When I have the fill phase set I set the injection pressure a couple of hundred psi (machine pressure) above what is used to fill at the speeds I have indicated. Then add the holding pressures after doing a gate freeze. I mostly do the gate freeze graphs for larger parts.
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11th October 2011, 11:25 PM
#3
I leave a time in the press, normally using a similar part's numbers for hold time, until I finish. Then I do the gate freeze. Nowperfrom the viscosity study since it has been saving me lots of time and scrap, first; then the gate freeze. I also try to run my hold pressure at about 60% of peak injection; another one of those time and scrap savers.
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27th December 2011, 11:42 AM
#4
Set the minimum value of the second stage pressure. [ some machine the minimum value was available ]
Set the holding time with the consideration of gate size, melt and mold temperature by right.
To minimize the screw bounce back at the transfer position time.
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19th January 2012, 03:42 PM
#5
The answer to the original question is yes. Turn off hold time and pressure. Some machine slope/ramp 1st stage hold pressure so if there is any time on the clock it will use that time to ramp down from pressure at transfer to 0.
GBYA
Aahz
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23rd January 2012, 11:50 AM
#6
Correct Aahz, One must study the controller to understand this.
Suhas
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