Method and apparatus for the extrusion of tubular...

Details Method and apparatus for the extrusion of tubular... Method and apparatus for the extrusion of tubular...

B - Operations, Transporting

29

C

18/528

B29C 47/90 (2006.01) B29C 47/00 (2006.01) B29C 47/88 (2006.01)

Patent

CA 1047722

METHOD AND APPARATUS FOR THE EXTRUSION OF TUBULAR THERMOPLASTIC FILM ABSTRACT OF THE DISCLOSURE The present invention relates to a method and apparatus for the extrusion of tubular thermoplastic film which comprises extruding a melt of thermoplastic material through an annular orifice to form a bubble or tube and while the tube is still in a semi-molten condition, passing the tube through an extrusion cooling and shaping means having a plurality of multi-perforated air rings shaped in congruance to the desired shape of the inflating tube. This method allows increased production speeds and minimized guage variation while maintaining bubble stability.

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