Crosshead with static mixers

Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion

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Details

425376A, 425467, B29D 2304, B29F 304, B29F 302, B01F 724

Patent

active

045740674

ABSTRACT:
A crosshead (10) and a method are provided for extruding a tubular layer of a thermoplastic material, or for coextruding tubular layers of various thermoplastic materials, without incurring a weld line in any of the layers. The crosshead (10) includes a supply passage (42), a distribution passage (46) which provides an annular flow of thermoplastic material around a mandrel (18) by providing separate flows that merge distal from the supply passage (42), a mixing passage (110) which serves as a first static mixer by dividing the stream of thermoplastic material into a plurality of streams (96) and subsequently merging the divided streams, and a forging passage (118) which serves as a second static mixer by compressively forging that thermoplastic material into a cross section of increased area prior to extruding the thermoplastic material through a die opening (38).

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