A method is disclosed for preparing and dispensing a mixture obtained by mixing at least one first chemically reactive component and at least one second chemically reactive component containing a dispersed solid material by a high pressure mixing device comprising a mixing chamber for mixing the components, in which a valve member is slidable, in particular a slide-valve, provided with longitudinal slots for recirculating the components to respective storage tanks. The method provides removing from at least one tank, a dosed quantity of the at least second chemically reactive second component to with filler material is added; recirculating the second component through the slots of the slide-valve for a period of time that is comparatively very reduced with respect to a recirculating step of the at least first component through the slide-valve. An apparatus for preparing and dispensing the mixture is also disclosed.

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.

Installation for manufacturing cross-linkable polyethylene compounds which comprises a melting machine (101), a melt pump (102) and a filtration unit (103). The installation allows to produce cross-linkable polyethylene compounds that may be further used for manufacturing insulating parts of medium, high and extra-high voltage power cables. A method for manufacturing cross-linkable polyethylene compounds is further provided.

A foam dispensing apparatus is capable of dispensing a mixture of a resin component and an isocyanate component. The foam dispensing apparatus includes a resin line and an isocyanate line connected to a manifold. A nozzle is connected to the manifold and the mixture is dispensed through the nozzle. The manifold defines a resin duct in communication with the resin line and the nozzle and an isocyanate duct in communication with the isocyanate line and the nozzle. At least one valve is connected to the resin and isocyanate lines and is moveable between an open position allowing flow through the resin and isocyanate lines and a closed position preventing flow through the resin and isocyanate lines. The valve is disposed exterior to the manifold and the flow is unregulated in the manifold for reducing maintenance of the manifold.

Methods and mechanisms for mixing and dispensing multipart materials is provided. The methods and mechanisms may be used for mix on demand operations as well as for encapsulation of electronic components. The methods and mechanisms may incorporate a mixer assembly from which material is substantially directly dispensed. The methods and mechanisms may incorporate mix on demand where first and second material supply sources include pumping arrangements for pumping first and second materials through a mixing arrangement. The pumping forces provided by the pumping arrangements also provide the force to dispense the mixed material where it will ultimately be formed, such as a potting location or a mold.

In the manufacturing method and manufacturing arrangement according to the invention for a silicone composition the mixer mixing the different subcomponents of the silicone composition are removed for the duration of downtime and cooled to a temperature, in which the chemical reaction between the different subcomponents of the silicone composition stops. In the manufacturing method of the invention the mixer is reconnected to the manufacturing apparatus arrangement after downtime without cleaning it from the silicone composition subcomponents remaining in the mixer.

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.

A non-aqueous inkjet ink comprising a near infrared absorbing particle, a dispersant, a solvent, the dispersant is a polymer comprising an amine group or an acidic group and the solvent is selected from the group consisting of ketones, esters, ethers and alcohols. The non-aqueous inkjet ink can act as a fusing agent in a high speed sintering process. The non-aqueous inkjet ink is suitable for printing transparent or coloured 3D-objects.

A non-aqueous inkjet ink comprising a near infrared absorbing particle, a dispersant, a solvent, the dispersant is a polymer comprising an amine group or an acidic group and the solvent is selected from the group consisting of ketones, esters, ethers and alcohols. The non-aqueous inkjet ink can act as a fusing agent in a high speed sintering process. The non-aqueous inkjet ink is suitable for printing transparent or coloured 3D-objects.

The invention relates to a method for metering a foamed or foamable plastic (5) in a preferably discontinuous manner. At least one first component (2) for forming the plastic (5) is conveyed into a mixing chamber (11) of a mixing device (10) in which a stirring mechanism (30) that can be rotated about a rotational axis (31) is arranged. The first component (2) is loaded with a gas (4) in order to influence the formation of foam, and the plastic (4) is metered out of the mixing chamber (11) through an outlet nozzle (18). According to the invention, the pressure in the mixing chamber (11) ranges from 0.2 bar to 15 bar, the gas (4) is injected into the first component (2), preferably directly into the mixing chamber (11), by a valve device (50), and the stirring mechanism (30) disperses the gas (5) in the first component (2).