Module forming part of a static mixer arrangement for a plastically flowable material to be mixed having a critical dwell time

A static mixer for a plastic flowable, composition to be mixed, which is critical with respect to the dwell time, the mixer comprising a tubular housing and a plurality of modules, each module comprising:

• a sleeve that can be pushed into the tubular housing;
• and
• at least four arms that are arranged at an incline with respect to the longitudinal axis of the housing and cross substantially on a straight line perpendicular to the longitudinal axis, the arms being formed in the shape of rods each having a tip directed opposite to the direction of movement of the composition to be mixed and a base that is fastened to the inner side of the sleeve, each tip forming an intermediate space with respect to the inner side of the sleeve;
• wherein an inner wall of the mixer that conducts the composition to be mixed is defined by the inner sides of the sleeve;
• wherein crossing lines of the arms of two neighboring modules are transversely disposed with respect to one another;
• and
• wherein the arms of a module project out of their module's respective sleeve and protrude into a free space of an adjacent sleeve.

A plant for the processing of plastic, flowable hard PVC or of another material which is critical with respect to the dwell time, the plant comprising a screw extruder and a molding tool lying downstream, and a static mixer located between the screw extruder and the molding tool, the mixer comprising a tubular housing and a plurality of modules, each module comprising:

• a sleeve that can be pushed into the housing;
• and
• at least four arms that are arranged at an incline with respect to the longitudinal axis of the housing and cross substantially on a straight line perpendicular to the longitudinal axis, the arms being formed in the shape of rods each having a tip directed opposite to the direction of movement of the composition to be mixed and a base that is fastened to the inner side of the sleeve, each tip forming an intermediate space with respect to the inner side of the sleeve;
• wherein an inner wall of the mixer that conducts the composition to be mixed is defined by the inner sides of the sleeve.

A module for a static mixer for a plastic flowable, composition to be mixed, which is critical with respect to the dwell time, the mixer comprising a tubular housing, the module comprising:

• a sleeve that can be pushed into the tubular housing;
• and
• at least four arms that are arranged at an incline with respect to the longitudinal axis of the housing and cross substantially on a straight line perpendicular to the longitudinal axis, the arms being formed in the shape of rods each having a tip directed opposite to the direction of movement of the composition to be mixed and a base that is fastened to the inner side of the sleeve, each tip forming an intermediate space with respect to the inner side of the sleeve;
• wherein the inner wall of the mixer that conducts the composition to be mixed is defined by the inner sides of the sleeve.
• wherein the arm cross-section is substantially elliptical, with the major diameter of the ellipse being perpendicular to the longitudinal axis of the housing and not being substantially greater than the minor diameter of the ellipse;
• and
• wherein at least one of downstream sides and upstream sides of the arms each have a longitudinal strip that is made at least approximately flat.

A module for a static mixer for a plastic flowable, composition to be mixed, which is critical with respect to the dwell time, the mixer comprising a tubular housing, the module comprising:

• a sleeve that can be pushed into the tubular housing;
• and
• at least four arms that are arranged at an incline with respect to the longitudinal axis of the housing and cross substantially on a straight line perpendicular to the longitudinal axis, the arms being formed in the shape of rods each having a tip directed opposite to the direction of movement of the composition to be mixed and a base that is fastened to the inner side of the sleeve, each tip forming an intermediate space with respect to the inner side of the sleeve;
• wherein an inner wall of the mixer that conducts the composition to be mixed is defined by the inner sides of the sleeve;
• and
• wherein adjacent arms are connected to one another along a crossing line.

A module for a static mixer for a plastic flowable, composition to be mixed, which is critical with respect to the dwell time, the mixer comprising a tubular housing, the module comprising:

• a sleeve that can be pushed into the tubular housing;
• and
• at least four arms that are arranged at an incline with respect to the longitudinal axis of the housing and cross substantially on a straight line perpendicular to the longitudinal axis, the arms being formed in the shape of rods each having a tip directed opposite to the direction of movement of the composition to be mixed and a base that is fastened to the inner side of the sleeve, each tip forming an intermediate space with respect to the inner side of the sleeve;
• wherein an inner wall of the mixer that conducts the composition to be mixed is defined by the inner sides of the sleeve;
• and
• wherein surfaces intended for contact with the composition to be mixed are coated.

A static mixer for a plastic flowable, composition to be mixed, which is critical with respect to the dwell time, the mixer comprising a tubular housing and a plurality of modules, each module comprising:

• a sleeve that can be pushed into the tubular housing;
• and
• at least four arms that are arranged at an incline with respect to the longitudinal axis of the housing and cross substantially on a straight line perpendicular to the longitudinal axis, the arms being formed in the shape of rods each having a tip directed opposite to the direction of movement of the composition to be mixed and a base that is fastened to the inner side of the sleeve, each tip forming an intermediate space with respect to the inner side of the sleeve;
• wherein an inner wall of the mixer that conducts the composition to be mixed is defined by the inner sides of the sleeve;
• and
• wherein crossing lines of the arms of two neighboring modules are transversely disposed with respect to one another.