Patent ID: 6474973
Filing Date: 2002-11-05
Classification: B29C

Abstract:
An extruder die head, having an internal cylindrical mandrel and a cylindrical jacket, which envelops concentrically said mandrel, an annular channel formed between said mandrel and said jacket for emptying into a die slit, and at least one borehole, which feeds a melt into said annular channel in an area opposite said die slit, the improvement comprising:said mandrel being made as one piece with a flange-like foot, and a ring shrunk onto said mandrel adjacent to said foot to seal the bottom of said annular chabbel between said mandrel and said jacket, said mandrel exhibits in an area adjacent to said foot at least one helical groove which exhibits a depth that decreases in a direction of said die slit and which closes in a direction of said foot and in an initial region in a vicinity of said foot empties said at least one borehole, and said shrunk-on ring encloses sealingly a groove-free end of said mandrel and said initial region that a provided with said grooves.