Apparatus for casting multi-layer composite film

Abstract

Abstract AN END-FEED DIE PLUG AND INLET BLOCK FOR A PLASTIC EXTRUSION MACHINE FOR CASTING MULTI-LAYER FILMS. ONE EMBODIMENT OF THE DIE PLUG IS A GENERALLY V-SHAPED GUIDE MEANS THAT RECEIVES A PORTION OF THE PLASTIC MELT INTO THE ENCLOSED PORTION THEREOF AND ANOTHER PORTION ON THE OUTSIDE SO THAT THE FIRST PORTION FORMS AN INNER LAYER AND THE OTHER PORTIONS FORM SURROUNDING OUTER LAYERS OF A COMPOSITE MULTI-LAYER FILM. A SECOND EMBODIMENT OF THE ENDFEED DIE PLUG IS A PREDETERMINABLY OFFSET PLANAR GUIDE MEANS DIRECTING PLASTIC MELTS TO A DIE MEANS IN PRESELECTED THICKNESS RATIOS FOR A TWO-LAYER COMPOSITE FILM. THE INLET BLOCK IS PROVIDED WITH ONE PASSAGEWAY FEEDING MELT ALONG A STRAIGHT LINE PATH INTO THE DIE MEANS AND ANOTHER PASSAGEWAY FEEDING MELT AT AN ACUT ANGLE TO THE STRAIGHT LINE PATH SO THAT THE PLASTIC MELT PASSING THROUGH THE SECOND PASSAGEWAY REACHES THE DIE OUTLET PRIOR TO THE MELT PASSING THROUGH THE FIRST PASSAGEWAY.

Inventors

• 👤 Larry O Stafford

Bibliographic Details