The invention is directed to an apparatus for making a finished rubber mixture which includes a reactive additive. The apparatus includes a tandem mixer with an upper machine having an upper mixing chamber and a lower machine having a lower mixing chamber. The lower mixing chamber is larger than the upper mixing chamber and there are rotors disposed in each mixing chamber. Mixture components are introduced into the lower mixing chamber via a loading shaft of a loading unit. The loading unit has at least two metering devices, a cutting or preheating unit connected upstream of a metering device and a first conveyor belt to the loading shaft. All conveyor belts of the apparatus can be switched on and off automatically, such that mixture components weighed in can be held in a “wait position” thereon.

The present invention relates to a splint bendable in a curved shape and a method of forming thereof. According to an embodiment of the present invention, there may be provided a splint bendable in a curved shape comprising a lower splint portion having a plurality of first ventilation holes formed at a certain interval; an extension splint portion in which a plurality of extension holes are formed at a certain interval; and an upper splint portion in which a plurality of second ventilation holes are formed at a certain interval, and wherein the lower splint portion, the extension splint portion, and the upper splint portion are bent into an arc shape by a first bending, and a second bending wherein the lower splint portion and the upper splint portion are bent at different angles by a plurality of extension holes is performed for the extension splint portion.

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.

A method for producing a powder comprising at least one polymer for use in a method for the additive manufacture of a three-dimensional object is described. The method includes the step of mechanically treating the powder in a mixer with at least one rotating mixing blade, wherein the powder is exposed to a temperature T.sub.B and T.sub.B is at least 30° C. and is below the melting point T.sub.m of the polymer (determined according to DIN EN ISO 11357) if the polymer is a semi-crystalline polymer, or wherein T.sub.B is at least 30° C. and wherein T.sub.B is at most 50° C. above the glass transition temperature T.sub.g of the polymer (determined according to DIN EN ISO 11357) if the polymer is a melt-amorphous polymer. Compared to a time before the start of the treatment, it may be achieved that after the treatment, the bulk density of the powder is increased by at least 10% (or in the case of polymer, copolymer or polymer blend of polyamide at least 2% and more) and the BET surface area is decreased by at least 10%, and optionally also the pourability is improved by at least 10%.

A method for producing a powder comprising at least one polymer for use in a method for the additive manufacture of a three-dimensional object is described. The method includes the step of mechanically treating the powder in a mixer with at least one rotating mixing blade, wherein the powder is exposed to a temperature T.sub.B and T.sub.B is at least 30° C. and is below the melting point T.sub.m of the polymer (determined according to DIN EN ISO 11357) if the polymer is a semi-crystalline polymer, or wherein T.sub.B is at least 30° C. and wherein T.sub.B is at most 50° C. above the glass transition temperature T.sub.g of the polymer (determined according to DIN EN ISO 11357) if the polymer is a melt-amorphous polymer. Compared to a time before the start of the treatment, it may be achieved that after the treatment, the bulk density of the powder is increased by at least 10% (or in the case of polymer, copolymer or polymer blend of polyamide at least 2% and more) and the BET surface area is decreased by at least 10%, and optionally also the pourability is improved by at least 10%.

In the field of mixing rubber mixtures, the invention is directed to a rotor (100) for use in an internal mixer having a mixing vessel in which the rotor rotates, the rotor having one or more blades (104), each blade having a tip (104a) with a profile having a predefined curvature; and an anti-wear device detachably fixed to the tip (104a) of at least one blade, the anti-wear device including a plate (110) with a profile defined by a lower surface (112) with a curvature complementary to that of the tip 104a and an upper surface (114) with a curvature complementary to that of a wall of the vessel to define, between them, a zone of minimum distance that allows passage of the mixture between the plate (110) and the wall of the vessel. The invention is also directed to an internal mixer having at least one mixing vessel in which the disclosed rotor (100) rotates.

Provided are a polymer ready for introduction into a kneading machine which is milled with good milling efficiency in a kneading machine and which provides a kneaded mixture with excellent filler dispersion, and a rubber composition and a pneumatic tire containing the polymer. The present invention relates to a polymer ready for introduction into a kneading machine, excluding natural rubber, the polymer having a temperature within the range of 20 C. to 80 C. and satisfying the following formula (I):
(Tip clearance d of kneading machine).sup.3(Volume V of polymer ready for introduction into kneading machine)2.010.sup.4 cm.sup.3(I).

A mixer control device having a function of a monitoring device acquires measurement data of monitoring target information that is obtained through measurement when a rubber material is kneaded by a mixer. In addition, the mixer control device compares the measurement data and reference data that is selected in past measurement data of the monitoring target information and performs abnormality determination. The mixer control device acquires measurement data that is measured from predetermined mixing operation initiation timing in a series of mixing operations of a rubber material in the mixer for every unit of the series of mixing operation.

A process for preparing a polyolefin composition including the steps of supplying a bimodal or multimodal polyolefin in form of a polyolefin powder having an mass-median-diameter D50 in the range from 300 m to 2500 m and one or more additives to a mixing device, mixing the polyolefin powder and the additives at a temperature from 10 C. to 120 C., transferring the mixture into a extruder device, melting and homogenizing the mixture within the extruder device to form a molten polyolefin composition, and pelletizing the molten polyolefin composition.

A process for producing a rubber mixture in a mixing apparatus having at least one mixing chamber (4, 4) in which rotors (5) are disposed, wherein a plant control system by means of which process parameters (especially the speed of the rotors (5), the suction output of a suction device (13, 14, 15) and the mixing time) are controlled by open- and closed-loop control is provided, wherein at least one rubber is mixed in the mixing chamber with at least one filler, especially silica, preferably with addition of at least one coupling agent, especially a silane, and wherein the gas mixture present in and above the mixing chamber is sucked out by means of the suction device, wherein volatile organic compounds, especially alcoholic gases, present in the gas mixture sucked in are detected continuously, wherein, in the event of exceedance of a concentration of organic compounds in the gas mixture sucked in that has been defined as the control limit, the concentration measured is employed as control variable in the plant control system for closed-loop control of at least one of the process parameters, and wherein, in the event of exceedance of a concentration of organic compounds in the gas mixture sucked in that has been defined as the safety limit, there is a safety shutdown of the mixing apparatus by means of the plant control system.