Patent ID: 6254368
Filing Date: 2001-07-03
Classification: B29C

Abstract:
Apparatus for producing plastic film by extrusion, comprising:a. a plastic extrusion machine comprising:i. an extrusion screw within an extrusion barrel for providing molten plastic material at an extrusion head defining an outlet end of said barrel; andii. a motor for turning said screw relative to said barrel and converting plastic resin from solid to viscous form;b. a die connected to said barrel outlet end for forming said plastic material into molten film upon exit therefrom;c. a manifold having a central opening receiving said die for channeling cooling air about said molten plastic material upon exit from said die;d. a blower for delivering cooling air to said manifold;e. means for collecting said film upon transition thereof from molten to solid phase downstream from said die;f. means for monitoring phase transition of said molten plastic into solidified plastic film and adjusting operation of said apparatus to maintain plastic material phase transition occurrence at a preselected position downstream of said die.