Injection Molding Machine Chapter 4
V3.0
4-21
2. PT mm: 92~98% of the entire injection travel is the approximate position for P/V TRANS.
POINT. In the case of high injection speed
，
uses small value of 92%
，
in the case of slow
injection speed
，
higher value of 98% shall be used.
Method for obtaining the P/V TRANS. POINT: First of all
，
set the pressure holding TIME of
all sections to be 0
，
change P/V TRANS. POINT PT mm(e.g.
，
the injection ending position
without pressure holding process)
，
so that the cavities can be fully filled but parts are with
serious shrinkage
，
this is the ideal P/V TRANS. POINT.
P Holding pressure control
1. Pressure holding V % is usually set at 10~20%
，
and shall not set to 0%.
2. Set the pressure holding TIME to 0 can reduce the sections of holding pressure. Or the
holding pressure sections required can be directly set on the INJECTION PAR. screen.
3. To reduce the INJ. HOLD PRESS < > SECTION according to the solidification process
of the product thus reducing the stress of the product.
4. CUSHION MONITOR: When set on
，
the injection end position will be compared with the
low and high cushion limit every shot
，
if the end position is within the limits
，
parts will be
seen as good
，
if not
，
part is seen as bad
，
bad parts counter is increased by one and an
alarm will be fired.
If the total bad parts counter is reached
，
production is stopped.
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