Extruder screw

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/62 (2006.01)

Patent

CA 2382110

Extruder screw having an axially extending extruding portion defined by a feed section, a barrier section and a metering section. At least one helical primary flight extends about and is coaxial with the screw body. The barrier section includes at least one helical secondary flight extending from the primary flight about the screw body which in turn defines a first surface of revolution between the primary and secondary flights. At least one helical tertiary flight is positioned between the primary and secondary flights and also extends about the screw body which defines a second helical surface of revolution between the primary and tertiary flights. A third surface of revolution is formed between the primary and tertiary fligths and extends axially along the barrier section. A series of circumaxially contiguous cam-like forms are created by a second and third surfaces of revolution.

L'invention concerne une vis d'extrudeuse présentant une partie extrudeuse s'étendant axialement, définie par une zone d'alimentation, une zone Maillefer et une zone de comptage. Au moins un filet primaire hélicoïdal s'étend coaxialement sur le corps de la vis. La zone Maillefer comporte au moins un filet secondaire hélicoïdal s'étendant à partir du filet primaire sur le corps de la vis, et définissant une première surface de révolution entre les filets primaires et secondaires. Au moins un filet tertiaire helicoïdal est disposé entre les filets primaire et secondaire et s'étend également sur le corps de la vis, et définit une deuxième surface de révolution entre les filets primaire et tertiaire. Une troisième surface de révolution est formée entre les filets primaire et tertiaire et s'étend axialement le long de la zone Maillefer. Une série de formes de type came circum-axialement contiguës sont produites par les deuxième et troisième surfaces de révolution.

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