A kneader internal inspection device according to the present invention suspends and supports a photographing unit, which is arranged in an interior of a kneader and which photographs the interior, so as to be vertically movable in the interior of the kneader. Therefore, such a kneader internal inspection device is capable of easily inspecting the interior of the kneader.

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.

Provided are a method for producing pellets that are easy to be uniformly molded at the time of using the pellet for molding even when the pellets include a large amount of inorganic substance particles, the pellets, and a method for molding a resin molded article. The method for producing pellets according to the present invention includes a method for producing pellets formed from a resin composition including a crystalline macromolecule and an inorganic fine powder or organic fine powder in a mass ratio of 50:50 to 20:80, the method including the step of kneading the crystalline macromolecule and the inorganic fine powder or the organic fine powder so that the microcrystalline size of the crystalline macromolecule is 190 ? or smaller. The pellets according to the present invention are pellets formed from a resin composition including a crystalline macromolecule having a microcrystalline size of 190 ? or smaller, and inorganic substance particles in a mass ratio of 50:50 to 20:80.

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.

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.

A method for manufacturing a rubber composition includes kneading a rubber component, an inorganic filler and a thioester-based silane coupling agent, and adding a vulcanizing agent and one or more compounds selected from the group of an imide compound and an N-oxyl compound to a mixture of the rubber component, the inorganic filler, and the thioester-based silane coupling agent such that the vulcanizing agent and the imide compound and/or the N-oxyl compound are kneaded with the mixture including the rubber component, the inorganic filler, and the thioester-based silane coupling agent.

A kneader includes a kneader main body including a casing including a kneading chamber and a kneading portion that is disposed in the casing and kneads a material in the kneading chamber. The material supplied to the kneading chamber includes a resin material, an inorganic additive added to the resin material, and a coupling agent for enhancing affinity of the inorganic additive for the resin material. The kneader further includes a kneading monitoring portion that monitors a kneading state of the material by detecting a reaction product that is generated by a reaction between the coupling agent and the inorganic additive.

Provided is a method for producing a vulcanized rubber composition, including: a first kneading step of obtaining a kneaded mixture comprising a rubber component comprising at least one selected from the group consisting of natural rubbers and synthetic rubbers, a filler comprising an inorganic filler, and a sulfur-containing silane coupling agent; a second kneading step of adding sulfur and a vulcanization accelerator to the kneaded mixture, followed by kneading, to thereby obtain an unvulcanized rubber composition; and a vulcanization step of vulcanizing the unvulcanized rubber composition to thereby obtain a vulcanized rubber composition having a glass transition temperature of 30 C. to 0 C. by; wherein specific aminoguanidines are added, followed by kneading, in the first kneading step.

A mixing and extrusion machine (10) for the manufacture of rubber mixtures includes 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) in such a way as to move in translational movement between an opening (22) arranged upstream and an outlet (25) arranged downstream of the sleeves. The screws are mounted in the sleeves with removable doors including sliding shutters (40) installed relative to the outlet (25). The sliding shutters move linearly between a closed position, in which the sliding shutters prevent the mixer from discharging the mixture, and an open position, in which the sliding shutters prevent discharge of the mixture through the sides of two counter-rotating rollers (32) of a roller nose type system located just downstream of the outlet.

A kneading state determination system includes a kneading unit and a determination unit. The kneading unit kneads a kneading material, and transmits a kneading state value indicating a kneading state to the determination unit. Based on the kneading state value transmitted from the kneading unit, the determination unit determines kneading of the kneading material in the kneading unit in accordance with a preset determination condition. The determination condition includes a determination period and a state value range. The state value range is set as a range for the kneading state value. The determination period is a partial period of a period from start to completion of the kneading in the kneading unit.