The invention relates to a mixing device for a twin-screw extruder, in particular a twin-screw extruder rotating in the opposite direction, comprising a first screw and a second screw, for mixing a melt flow in a screw antechamber, wherein the first screw has an extension in the form of a mixing screw tip connected to the first screw in a fixed manner, and a first melt channel, into which the first screw feeds, is arranged in a flow-connected manner via an elongated slot with a second melt channel, into which the second screw feeds.

The invention relates to a method of preparing reclaimed rubber, especially using multi-stage screw extruders, which belongs to the field of recycling and reusing of waste rubber. The rubber powder and softener which were preliminarily mixed are compacted and added into first counter rotating twin screw extruder through thermal insulation and metering apparatus, the softener permeates the waste rubber powder uniformly under the action of temperature in the extruder to finish primary desulfurization of rubber waste powder; add preliminary devulcanized material continuously into second multi screw extruder after cooling by transformation device, rapid desulfurization and regeneration can be achieved by means of activator and shear action; The desulfurized rubber powder is cooled and transported into the third multi-screw extruder in series, the performance of deprocessing can be improved by shear action under low temperature; After extrusion, the recycled rubber is obtained by molding device and cooling device. The whole process is completed under closed oxygen isolation condition, realizing safe, simple and continuous desulfurization regeneration. It is energy saving and environmental protection with excellent properties.

Methods for granulating a pharmaceutical powder in a single piece of equipment include at least the following: (a) continuously introducing the pharmaceutical powder and a granulating fluid to the single piece of equipment, (b) passing the pharmaceutical powder and the granulating fluid through a granulating zone of the single piece of equipment to form wet granules, (c) passing the wet granules through a drying zone of the single piece of equipment, (d) optionally passing granules through a discharge zone of the single piece of equipment, and (e) continuously discharging the granules from the single piece of equipment where the single piece of equipment is not a fluid bed processor.

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 mixing and cooling system (1) includes a mixing and screw-extrusion machine (10) with a mixer (12) having a converging conical twin screw; a ram (30) that moves along the inside of an introduction hopper (24) of the machine; a roller nose system disposed just downstream of an outlet (25) of the mixer to form a sheet (112) of the mixture exiting the mixer; and a mobile sleeve or sleeves (34) that move in a linear movement relative to the outlet. The system also includes a cooling system with a spray installation(s) (102, 104) that delivers water at a predetermined rate to the sheet exiting the machine; a suction installation(s) proportionate to each spray installation; and at least one transport means (114, 116) that transports the sheet in a predetermined direction.

A mixing and extrusion machine (10) has a converging conical twin-screw mixer (12) with a fixed frame (14) that supports sleeves (16) in which two screws (18) are mounted at an angle between an opening (22) arranged upstream of the sleeves, where an introduction hopper (24) of the machine (10) feeds the screws, and an outlet (25) arranged downstream of the sleeves, where the mixer discharges the mixture at the end of a mixing cycle. At least one mobile sleeve (34) is disposed towards the outlet, each mobile sleeve with a support surface (34a) of a predetermined surface area (34a) according to an elasticity of the mixture, and each mobile sleeve having one or more mobile elements that move by a linear movement with respect to the outlet in order to adjust a predetermined space between the sleeves and the screws.

A dispersive mixing element for co-rotating twin screw extruder is disclosed. The element for co-rotating twin screw extruder comprises of a continuous flight helically formed thereon having a lead ‘L’, wherein either the flight transforms at least once from an integer lobe flight into a non-integer lobe flight in a fraction of the lead ‘L’ and transforms back to an integer lobe flight in a fraction of the lead ‘L’ or the flight transforms at least once from a non-integer lobe flight into an integer lobe flight in a fraction of the lead ‘L’ and transforms back to a non-integer lobe flight in a fraction of the lead ‘L’.

A method for producing a stabilizer composition for a polymer and a stabilizer composition produced by the method. At least one carboxylic acid is reacted with at least one metal compound, such as at least one metal hydroxide and/or at least one metal oxide and/or at least one metal carbonate, thereby forming a metal carboxylate of the carboxylic acid. The reaction of the carboxylic acid with the metal compound is carried out in a continuous manner in an extruder while reaction water being formed is discharged out of the extruder.

Method for manufacturing a composite material, comprising the following steps: a) plasticizing a binder in an extruder, wherein the binder comprises a polymer; b) providing a mixture of a cellulosic material and a hydrophobic agent dissolved and/or dispersed in a liquid carrier; c) mechanically shearing and drying the mixture in an extruder whereby liquid is at least partly extracted from the mixture or is not present in liquid form anymore; and d) blending the dried mixture with the plasticized binder.

An introduction port 3 is provided on the rear side of a casing 2, and a discharge port 4 is provided at the tip of the casing 2, Inside the casing 2, two screws 7 are arranged so that a center distance thereof gradually decreases from the introduction port 3 to the discharge port 4, In a rear end wall 11, a drainage port 10 that discharges water produced from a material out of the casing 2 is provided. The drainage port 10 is provided at a position higher than the lowermost end of the rear end wall 11.