Extruder screw

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/62 (2006.01)

Patent

CA 2382111

An axially elongated extruder screw (22) includes a screw body having an axially extending extruding portion defined by a feed section (F) at an inlet end of the screw, a metering section (M) at an outlet end of the screw and a barrier section (B) between thea feed and metering (M) sections. A first helical primary flight (42) extends about and is coaxial with the screw body along the length of the extruder screw (22). A second helical primary flight (48) extends at least part-way along the feed section to the outlet end of the extruder screw (22). The barrier section (B) of the extruder screw defines first and second barrier flights positioned between the primary flights (42, 48) and cooperating therewith to form first and second melt (70, 76) and solids (56, 58) channels that extend along the barriers section (B) of the extruder screw (22).

L'invention concerne une vis d'extrudeuse axialement allongée (22) comprenant un corps de vis composé d'une partie extrudeuse s'étendant axialement, définie par une zone d'alimentation (F) au niveau d'une extrémité d'entrée de la vis, d'une zone de comptage (M) au niveau d'une extrémité de sortie de la vis, et d'une zone Maillefer (B) entre les zones d'alimentation (F) et de comptage (M). Un premier filet hélicoïdal primaire (42) s'étend de manière coaxiale sur le corps de la vis, le long de la vis d'extrudeuse (22). Un deuxième filet hélicoïdal primaire (48) s'étend au moins partiellement le long de la zone d'alimentation vers l'extrémité de sortie de la vis d'extrudeuse (22). La zone Maillefer (B) de la vis d'extrudeuse (22) définit un premier et un deuxième filet Maillefer (60, 62) disposés entre les filets primaires (42, 48) et interagissant avec ceux-ci afin de former un premier et un deuxième canal de matière en fusion (70, 76) et de solides (56, 58) s'étendant le long des zones Maillefer (B) de la vis d'extrudeuse (22).

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