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Bubbles
seen through the Window
Low
Melt Pressure - Medium Melt Pressure - High Melt Pressure Description of the ApparatusThe In-Line Solubility
measurement apparatus at PPI consists of a custom designed single screw
extruder, Physical Blowing Agent injection accessories, adjustable pressure
control valve, optical window and video equipment. Metered quantities of the
polymer and the physical blowing agent are fed and mixed into the extruder. A
traveling microscope, video camera, TV monitor and VCR are used to monitor
the quality and opacity of melt-physical blowing agent through the optical
window. The melt pressure at the window is controlled by a manually
controlled valve, which is placed downstream. The melt pressure, temperature
and the blowing agent flowrate are monitored and
recorded digitally. Schematic
of the Apparatus |
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