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④ By controlling the actuator for the core, control the thickness of the parison at the core die gap portion.
⑤ During ② to ④, DigiPackⅢ functions as a digital interface with the PLC of the blow molding machine
and provides information such as the end of the program and the point status of the program sequen-
tially.
1.2.1.2. Accumurator type molding machines
When used with accumulator machines, the DigiPackⅢ controls the parison wall thickness relative to the
accumulator position as the plastic is being extruded.
As the total quantity or volume of plastic extruded is proportional to the accumulator position, then it follows
that the resulting parison wall thickness at any given point on the length of the container must be related
to the accumulator position. Given that the physical properties of the plastic and its temperature are con-
stant from container to container, then each container’s weight and strength will be consistent.
Figure 1-3 Basic Accumulator Machine Control Diagram
A potentiometer measures the accumulator position and controls the vertical axis of the program display.
The operator can also set the accumulator operating stroke, shot size, and accumulator injection comple-
tion position (cushion). In addition, DigiPackⅢ also provides interface signals to the machine's PLC for
these functions. After that, the operation of the accumulator is controlled by the PLC.
With an accumulator type blow molding machine, DigiPackⅢ operates / processes as follows.
① The operator sets the core position (core die gap opening / closing amount) necessary to obtain the
desired wall thickness (usually constant wall thickness) product on the DigiPackⅢ controller panel.
② When the start signal switches from OFF to ON, the DigiPackⅢ controls the servo valve so that the
core follows the set position according to the position of the accumulator.
③ The servo valve adjusts the flow rate to the core actuator according to the (flow rate) command from
DigiPackⅢ.
④ By controlling the actuator for the core, control the thickness of the parison at the core die gap portion.
Tooling
Accumulator Push Cylinder
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