A continuous kneading device including a pair of kneading rotors, capable of increasing mesh between the kneading rotors while also suppressing a kneading load applied to the kneading rotors. The continuous kneading device including a barrel and a pair of kneading rotors housed in the barrel. The kneading rotors rotate in mesh in directions different from each other. Each kneading rotor includes a plurality of kneading flights for kneading a material supplied into the barrel. The material is fed axially from the upstream kneading section to the downstream kneading section to be sequentially kneaded. The kneading flight constituting the downstream kneading section has a rotational outer diameter larger than a rotational outer diameter of the kneading flight constituting the upstream kneading section.

A continuous kneading device including a pair of kneading rotors, capable of increasing mesh between the kneading rotors while also suppressing a kneading load applied to the kneading rotors. The continuous kneading device including a barrel and a pair of kneading rotors housed in the barrel. The kneading rotors rotate in mesh in directions different from each other. Each kneading rotor includes a plurality of kneading flights for kneading a material supplied into the barrel. The material is fed axially from the upstream kneading section to the downstream kneading section to be sequentially kneaded. The kneading flight constituting the downstream kneading section has a rotational outer diameter larger than a rotational outer diameter of the kneading flight constituting the upstream kneading section.

Provided is an apparatus for dispensing a composition that includes a barrel having an inlet and outlet, an extrusion screw, and a drive mechanism operatively coupled to the extrusion screw. The extrusion screw includes a shaft having a shank end for connection to the drive mechanism and a distal end opposite the shank end. A first helical flight extends around a first section of the shaft, and a second helical flight extends around a second section of the shaft. The second section is located distal to the first section and the first helical flight has a nominal outer radius less than that of the second helical flight, and optionally the first helical flight has a pitch shorter than that of the first helical flight.

Provided is an apparatus for dispensing a composition that includes a barrel having an inlet and outlet, an extrusion screw, and a drive mechanism operatively coupled to the extrusion screw. The extrusion screw includes a shaft having a shank end for connection to the drive mechanism and a distal end opposite the shank end. A first helical flight extends around a first section of the shaft, and a second helical flight extends around a second section of the shaft. The second section is located distal to the first section and the first helical flight has a nominal outer radius less than that of the second helical flight, and optionally the first helical flight has a pitch shorter than that of the first helical flight.

The present disclosure relates to devices for extruding plastics, notably mixtures of elastomers which are intended to be used in the manufacture of tires.

The present disclosure relates to devices for extruding plastics, notably mixtures of elastomers which are intended to be used in the manufacture of tires.

Disclosed is a composite material manufacturing equipment including a raw material cylinder, an oil hydraulic piston and a rotating mold. The raw material cylinder has a raw material chamber, a material inlet and a material outlet, the raw material chamber can be filled with a substrate and a reinforcing phase material. The oil hydraulic piston is arranged at a side of the material inlet of the raw material cylinder for pushing the substrate and the reinforcing phase material to move towards the material outlet. The rotating mold is arranged at a side of the material outlet of the raw material cylinder, and includes an outer mold and a rotating flow channel inside the outer mold, the outer mold can rotationally rub the substrate to plasticize the substrate, the rotating flow channel can disperse and mix the plasticized substrate and the reinforcing phase material to form a composite material.

A screw to be used in an extruder has a modular structure so that it can be adapted very flexibly to new tasks and conditions. The modular structure of a screw contains a rod-shaped mandrel and individual screw components which are slidable onto the mandrel. The components perform the classic functions of the screw during the extrusion process, such as conveying, kneading, mixing or shearing of the plastic to be guided into and through the plant.

For transmission of the occurring high torque, the components are connected with the mandrel so that they positively engage and are axially braced in addition. The connection is to be performed such that it can be released by simple means.

A method is disclosed for manufacturing a plastic optical fiber composed of a plurality of layers including a core and a cladding, which includes forming at least one layer formed of the plurality of layers by melt extrusion molding of a material resin using a melt extrusion unit including an extrusion screw, wherein a pellet of the material resin is fed to the melt extrusion unit, and a relation expressed by the following inequality (I) is satisfied by a flight height H.sub.f (mm) of the extrusion screw in a feed zone L.sub.f of the melt extrusion unit and a maximum dimension L.sub.max (mm) of the pellet to be fed: 0H.sub.fL.sub.max3 (I); and a volume V (mm.sup.3) of the pellet satisfies the following inequality (II): 4<V<25. The manufacturing method is suitable for further improvement of the quality of plastic optical fibers.

In a method and an apparatus for increasing the intrinsic viscosity of a polycondensate melt at negative pressure, the melt enters a chamber, in which a negative pressure of less than 20 mbar prevails, through a perforated plate or a screen having openings with a diameter of less than 0.5 mm. The melt passes through this chamber in free fall in thin threads and remains in a reservoir beneath the chamber for at least one minute. The melt is moved constantly in the reservoir, and discharged from the reservoir, by a helical mixing and discharge part.