B-SIM V2.5 Reference - Blow molding simulation
AWT / PWT control specification
AWT (Axial Wall Thickness) control
The axial wall thickness (AWT) control enables to adjust the annular
die gap along the length (axis) of the extruded parison. The adjusting
is achieved by hydraulic shifting of a conical core part (mandrel) in
the die:
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The maximum value (100%) specified in the AWT / PWT control settings box corresponds to the maximum opening of the extrusion die. This means that to get the maximum thickness at the die exit using AWT control, the setting must be 100%. To get the minimum thickness, setting must be 0%.
PWT (Partial Wall Thickness) control
The partial wall thickness (PWT) is much more sophisticated way of controlling
the extruded parison thickness. PWT controls allow to vary the circumferential
wall thickness distribution dynamically over the parison length. Two
servohydraulic actuators deform the dynamic flexible deformable ring
by pushing and pulling, so that the required parison wall thickness
is achieved at every desired point, circumferentially and axially:
The PWT angle orientation value (in AWT/PWT view) estimates the angle used to rotate the PWT control about Z axis. This angle is used also for SFDR rotation.
