Mixing device (1) for dispensing a multi-component polymeric mixture, comprising a main body (2) comprising a mixing chamber (3) for mixing a first and a second component of the mixture, the mixing chamber having a main development along a longitudinal direction (100) and comprising a respective longitudinal open end (4); a movable body (5) having a central axis (101) with longitudinal development and slidably housed in the main body (2) to alternatively assume, by sliding along the longitudinal direction (100), an occlusion position of the mixing chamber (3) and a mixing position, wherein the movable body (5) comprises a first channel (6) and a second channel (7) each comprising a respective end portion (20) both displaced from the central axis (101) of the movable body (5) and developing substantially along the longitudinal direction (100) up to a longitudinal end face (8) of the movable body (5) facing the open longitudinal end (4) of the mixing chamber (3), wherein the respective end portions (20) of the first (6) and second channel (7) develop inside the movable body (5) or they are made by respectively a first (9) and a second groove (10) obtained on a longitudinal surface (11) of the movable body (5), each groove (9, 10) having development with a component perpendicular to the longitudinal direction (100).

Planetary gear mechanisms require internal toothed gears in housings. A drive rotor and driven rotors are accommodated in a mixing space in a housing, and chemical inflow paths to the mixing space are formed in an upper portion of the housing. A mixture outflow path is formed in a lower portion of the housing. The mixing space is formed to allow the drive rotor and the driven rotors to rotate and to regulate the positions of the drive rotor and the driven rotors. Meshing the drive rotor with the driven rotors allows the driven rotors to rotate opposite to the rotating direction of the drive rotor accompanying the rotation of the drive rotor while the lower ends of the driven rotors are located above a bottom portion of the mixing space and the upper ends of the driven rotors are located below the lower surface of the lid body.

A method of making a urea containing powder by injecting an amine and an isocyanate simultaneously into a mixing chamber is disclosed. The method comprises mixing in a high-pressure impingement mixing device at a pressure of at least 2500 psi for a time less than 10 seconds. The resulting urea containing powders have defined particle sizes and molecular weight distributions as well as a stoichiometric mole ratio of isocyanates and amine functionalities. Methods of making a thickened polyurea containing master batch with the urea containing powders using a shear thickening step, and making a grease by gelling the first or second urea containing powder under heat and in the presence of an oil are also disclosed.

A high-pressure mixing device adapted to form a polymeric mixture from the reaction of two or more reactive liquid components or resins, comprises a head-body with a mixing chamber having an inner cylindrical surface with inlet and outlet openings for injecting and recirculating reactive components; a duct for delivering the mixture, a valve body with recirculation longitudinal slots; the delivery duct, of the self-cleaning type, is a single-piece tubular element, insertable into a hole passing through the head-body, having an intermediate transversal hole aligned with the mixing chamber with a diameter greater than a diameter of the mixing chamber for avoiding protrusions of the walls of the transversal hole from forming inwardly of the mixing chamber of the head-body. Sealing elements duly arranged between the coupling interfaces of the various components prevent the leakage of polymeric mixture and lubricant liquid. There is also disclosed a related method.

A device and a method for producing reaction plastics, including a first metering device with a first metering unit and a second metering unit, each of which is suitable for receiving and dispensing a first mixing component in a metered manner, a second metering device which is suitable for receiving and dispensing a second mixing component in a metered manner, and a mixing device which is suitable for receiving and mixing the first mixing component dispensed by the first metering unit and/or the second metering unit of the first metering device and the second mixing component dispensed by the second metering device. For this purpose the first metering unit and the second metering unit are connected to the mixing device such that prior to beginning the mixing process, the first mixing component can be brought to an operating state required for the mixing process, in particular an operating pressure, by guiding the first mixing component from the first metering unit to the second metering unit via the mixing device.

A device and a method for producing reaction plastics, including a first metering device with a first metering unit and a second metering unit, each of which is suitable for receiving and dispensing a first mixing component in a metered manner, a second metering device which is suitable for receiving and dispensing a second mixing component in a metered manner, and a mixing device which is suitable for receiving and mixing the first mixing component dispensed by the first metering unit and/or the second metering unit of the first metering device and the second mixing component dispensed by the second metering device. For this purpose the first metering unit and the second metering unit are connected to the mixing device such that prior to beginning the mixing process, the first mixing component can be brought to an operating state required for the mixing process, in particular an operating pressure, by guiding the first mixing component from the first metering unit to the second metering unit via the mixing device.

Planetary gear mechanisms require internal toothed gears in housings.

A drive rotor and driven rotors are accommodated in a mixing space in a housing, and chemical inflow paths to the mixing space are formed in an upper portion of the housing. A mixture outflow path is formed in a lower portion of the housing. The mixing space is formed to allow the drive rotor and the driven rotors to rotate and to regulate the positions of the drive rotor and the driven rotors. Meshing the drive rotor with the driven rotors allows the driven rotors to rotate opposite to the rotating direction of the drive rotor accompanying the rotation of the drive rotor while the lower ends of the driven rotors are located above a bottom portion of the mixing space and the upper ends of the driven rotors are located below the lower surface of the lid body.

Polymeric Materials An injector (14) for injecting liquid formulation into molten polymer includes a conduit (117) having regions (44, 46) which are secured within a wall of an extruder (19). Conduit (117) includes an annular collar (120) having an upwardly facing annular surface (122) which is arranged to bear against part of a sleeve nut (124). Conduit (117) is arranged within a port (125) which includes a screw-threaded wall (126). The sleeve nut (124) includes a cylindrical body (146) having an inwardly facing cylindrical wall which is arranged to define a cylindrical air gap (148) between itself and an outer wall (147) of conduit (117). Region (150) of the sleeve nut is screw-threadedly engaged in wall (126) of the extruder. In use, cool compressed air is introduced into the assembly in the direction of arrow (170) and it flows through the assembly to cool it.

A high-pressure mixing device adapted to form a polymeric mixture from the reaction of two or more reactive liquid components or resins, comprises a head-body provided with a mixing chamber having an inner cylindrical surface with inlet and outlet openings for injecting and recirculating reactive components; a duct for delivering the mixture, communicating with the mixing chamber; a valve body with recirculation longitudinal slots, sliding into the mixing chamber between a backward position in which it clears the inlet openings and enables to mix components, and an advanced position, in which the slots put inlet openings in communication with outlet openings for recirculating the reactive components; the delivery duct, of the self-cleaning type, is a single-piece tubular element, removably fastenedby means of fixing membersand can be inserted into a hole transversal to the mixing chamber passing through the head-body; the tubular element has an intermediate transversal hole aligned with the mixing chamber with a diameter greater than a diameter of the mixing chamber for compensating, while assembling, for possible inevitable errors of alignment and mutual positioning due to processing tolerances of the parts to be coupled and for avoiding protrusions of the walls of the transversal hole from forming inwardly of the mixing chamber of the head-body, protrusions that might interfere with the end the walls of the valve member during the movement in the hole passing through the thickness of the tubular element until the end of said hole leading into the delivery chamber and that extends the mixing chamber to the wall of the self-cleaning delivery duct. Between the tubular element and the pass-through hole in the head-body a gap is defined, i.e. a certain coupling tolerance with a clearance between the tubular element and the hole, enabling to insert and remove the tubular element into/from the pass-through hole. Sealing elements prevent the leakage of polymeric mixture and lubricant liquid in the aforesaid gap; analogously, between the surface of the cap and the second holeobtained in a opposite position with respect to the holea respective gap with clearance is defined where an elastic or elasto-plastic sealing is interposed; the valve member, in the advanced and penetrating position into the hole of the tubular element, is separated therefrom by a gap, with a sealing member interposed therebetween; the gap prevents the metal-on-metal contact on the front part of the valve element when it enters into the intermediate hole; generally, thanks to gaps, the assembly and coupling of respective components is eased, facilitating the centering and mutual angular posit

A cleaning piston for a mixing head of a reaction moulding machine includes a main part which has a cylindrical casing region, and a clearing part. The material and geometry of the clearing part are designed to remove residual material adhering to a channel of the mixing head. The clearing part is at least partly made of non-polar material.