METHOD FOR THE MANUFACTURE OF A SLEEVE FOR A MULTI-SCREW EXTRUDING MACHINE, AND SLEEVE

摘要

ABSTRACT OF THE DISCLOSURE: The invention relates to a sheath multi-lobed and its production method, the inner wall of said sheath being comprised of n adjacent cylindrical sectors with an angle at center A and of radius r surrounding each screw on the part of the periphery of thereof external to the penetration zone. According to the invention, is carried out 1 n shells each having an inner face 10 shaped Cy lindrique sector reamed to the radius r and the central angle B less than A and n 2 rules each having two concave faces V 20 in the form of cylindrical sectors reamed to the radius r, an angle at center C = and whose axes are parallel and separated by a distance (e) equal to the distance between each screw and the shell 1 is fixed on two rules 2 so that its axis coincides with the axes of the corresponding concave faces 20 of said rules 2. the invention is applicable to machines rained-eral screw extruders kind of nested.