There is provided a rotor for use in an tangential internal batch mixer, the rotor comprising a main body configured to rotate about a rotor axis, a wing extending from the main body, and arranged helically about a portion of the main body, the wing comprising a wing tip surface, a first portion of the wing tip surface extending between a first edge and a second edge of the wing, wherein the first edge comprises a first helix angle and the second edge comprises a second helix angle, the first helix angle being different to the second helix angle.

Fiber-reinforced composite materials include a matrix of a thermoplastic polyamide resin, at least 3 weight% of at least one impact modifier, and 7-60 wt% fiber reinforcing agent of discontinuous meta-aramid fibers. The composite material is melt processable, and is impact resistant as measured by an unnotched Izod test method according to ASTM D4812 having a value of at least 12 ft-lbs/in (640 J/m). The composite materials can be used to prepare articles such as safety articles.

A production line (100) has an internal mixer (MI); at least one hot mixing line (102) disposed downstream of the internal mixer and including at least one twin-screw mixing machine (B.sub.Xc) that performs a process of mixing the rubber mixture exiting the internal mixer; at least one cold mixing line (104) disposed downstream of the hot mixing line and including at least one twin-screw mixing machine (B.sub.XF) that performs a process of mixing the rubber mixture exiting the hot mixing line; a batch-off installation (BO) disposed downstream of the cold mixing line that performs an anti-sticking and cooling process of the rubber mixture exiting the cold mixing line; and an end-of-line installation (FL) disposed downstream of the batch-off installation that performs one or more end-of-line processes of the rubber mixture.

An internal mixer includes a mixing chamber enclosed by a housing, a feeding neck in which a ram is guided, a closable discharge door, and an intermeshing rotor system, composed of a pair of rotors that can each be rotated about a rotor longitudinal axis, each rotor comprising a rotor main body on which at least one respective rotor blade is arranged, and the rotor blades of the two rotors meshing with one another, is to be refined in such a way that an improved, that is, faster, pull-in behavior is achieved, while optimizing the dispersion and distribution of the introduced materials. To this end, it is provided that in the case of at least one of the rotors, the rotor main body, at least in sub-regions, is non-cylindrical and has a non-circular cross-section, in the surface sections in which no rotor blades are arranged on the rotor main body.

A mixing and extrusion machine (10) for the manufacture of rubber mixtures has a mixer with a converging conical twin screw (12) with a fixed frame (14) that supports sleeves (16). Two screws (18), being mounted at an angle, are mounted in the mixer (12) so as to move in translational movement between an opening (22) arranged upstream and an outlet (25) arranged downstream of the sleeves, so that the thread tips of each screw contact tangentially the surfaces of the opposite screw so that the screws remain substantially in contact with each other when the screws rotate at an angle and at a center distance that facilitates self-cleaning. The screw threads maintain tangential contact with the inner surfaces of the sleeves, thus preventing the retention of mixing material on these surfaces.

A kneading device for dispersing a dispersoid in a dispersion medium includes a casing in which a kneading material containing the dispersion medium and the dispersoid is accommodated, a rotor disposed in the casing and kneading the kneading material while dispersing the dispersoid in the dispersion medium by rotating about a rotation axis, and a detection unit detecting a dispersion degree of the dispersoid in the dispersion medium by observing a state of the kneading material in the casing.

In the field of tire production, systems and methods make it possible to selectively carry out monopassage and multipassage rubber production sequences in a common rubber production facility. A tire is formed according to the methods described.

In the field of tire production, systems and methods utilize a feed belt (150) for directing a rubber mixture from an initial mixing installation (20) toward at least one of two mixing and cooling installations (100, 100′). It is possible to selectively carry out monopassage and multipassage rubber production sequences in a common rubber production facility. A tire is formed according to the methods described.

In kneading rotors, a twist angle of long wing constituting kneading wings is between 38 degrees and 53 degrees inclusive. The long wing includes, between the long wings and an inner surface of a casing, wing tops configured to form, along a wing longitudinal direction, a first tip clearance, and a second tip clearance narrower than the first tip clearance in width. A central angle of the long wing forming the second tip clearance is between 5 degrees and 10 degrees inclusive.

Provided is a dust stop device for a sealed kneader, the device being capable of excellent supply of lubricating oil. The sealed kneader includes a pair of rotors and a supporting member. The dust stop device includes a rotating ring attached to each rotor and a stationary ring attached to the supporting member. Both the rings have respective contact surfaces which make surface contact with each other. The stationary ring has a lubricating-oil supply portion with a through-hole. A part of the through-hole, the part including a part opened in the contact surface, is a long hole extending along a circumferential direction of rotation of the rotating ring.