Screw intended for the extrusion or mixing of elastomers and method for fitting same

1. A screw intended for the extrusion or mixing of elastomers or plastic products, comprising:

a support,

at least one sleeve having at least one relief projecting from an external face of the sleeve, and

at least one piece split annular securing member, the member being tightened between the sleeve and the support in a radial direction with respect to an axis of the screw so as to secure the sleeve rigidly to the support, the member and the sleeve having frustoconical faces in mutual contact.

2. The screw according to claim 1 , in which the sleeve, or at least one of the sleeves, exhibits a wall thickness smaller than or equal to 10 mm.

3. The screw according to claim 1 , in which the member or the one at least of the securing members is split in a parallel direction with respect to a principal axis of the member.

4. The screw according to claim 1 , in which the securing member exhibits at least two splits.

5. The screw according to claim 4 , in which the splits or at least two of the splits extend from respective different end edges of the member.

6. The screw according to claim 1 , in which the member exhibits a total length lower than a total length of the sleeve.

7. The screw according to claim 1 , in which the securing member is in contact with the sleeve via a single frustoconical contact face of the member.

8. A device for the extrusion or mixing of elastomers or plastic products, comprising a screw according to claim 1 .

9. The screw according to claim 2 , wherein the wall thickness is smaller than or equal to 3 mm.

10. The screw according to claim 4 , wherein the securing member exhibits at least four splits.