Bubbles seen through the Window
Low Melt Pressure - Medium Melt Pressure - High Melt Pressure
Description of the Apparatus
The 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