Blown Film Line

A 1.5” diameter, 24 L/D long single screw extruder was used for plasticating polymer pellets to homogeneous melt. Normally the pellets were gravity fed through the hopper. For moisture sensitive materials, a hopper drier was used. Mounting a dosing feeder for meter feeding additive was also done. A 10 HP DC motor, the speed of which is controlled manually from the control panel, drove the extruder.  The feed throat could be heated or cooled by circulating heat transfer fluid. The barrel had four independently controlled temperature zones. Pressure and temperature transducers were mounted at the end of the barrel to monitor the melt pressure and temperature. A 4” dia. spiral mandrel die  was used for extruding the melt in tube form. The bubble was stabilized by adjusting the internal bubble air pressure, outside cooling air flow rate and the line speed. The tower was 10 ft high. The bubble was collapsed by the nip roll and was wound on 4” dia core.
 

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 Polymer Processing Institute

This line was used for the production of film in tubular form. The film was blown upward and was used for process development or for material evaluation.

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