Abstract:
The present disclosure relates to a process for preparing granules from an input material or a powder material. The process comprises feeding the input material for granulation in the processor using one or more powder feeders, introducing steam as a granulation activating agent in the processor, granulating the input material in presence of the steam to form granules, and optionally collecting the granules from a discharge zone of the processor, wherein feed rate of the steam into the processor is determined based on feed rate of the input material into the processor. A co-rotating twin-screw processor for preparing granules is also discl
Abstract:
[Task] Provided is an injection unit in which whirling of a screw is suppressed and the friction between the screw and a cylinder is reduced. [Means for Resolution] An injection unit includes: a cylinder which heats a molding material; and a screw which is rotatably disposed in the cylinder, in which the screw has a rotary shaft, a helical flight which protrudes from an outer periphery of the rotary shaft, and a helical partition flight which partitions a groove which is formed by the flight, and feeds the molding material from the upstream side to the downstream side along the rotary shaft by rotation of the rotary shaft, the flight has a different diameter flight portion in which the height of a downstream-side end portion of a top is lower than the height of an upstream-side end portion of the top, and an upstream end of the partition flight is disposed on the further upstream side with respect to a downstream end of the different diameter flight portion.
Abstract:
[Task] Provided is an injection unit in which whirling of a screw is suppressed and the friction between the screw and a cylinder is reduced. [Means for Resolution] An injection unit includes: a cylinder which heats a molding material; and a screw which is rotatably disposed in the cylinder, in which the screw has a rotary shaft, and a helical flight which protrudes from an outer periphery of the rotary shaft, and feeds the molding material from an upstream side to a downstream side along the rotary shaft by rotation of the rotary shaft, the flight has a helical first flight portion, and a helical second flight portion which is disposed on the further downstream side with respect to the first flight portion, the second flight portion is a different diameter flight portion in which a height of a downstream-side end portion of a top is lower than a height of an upstream-side end portion of the top, and the ratio of a flight width of the second flight portion to a pitch of the second flight portion is larger than the ratio of a flight width of the first flight portion to a pitch of the first flight portion.
Abstract:
A co-rotating twin screw extruder for forming fragments is disclosed. The extruder comprises of an intake zone for receiving one or more excipient(s) suitable for oral dosage or one or more excipient(s) suitable for oral dosage along with one or more active pharmaceutical ingredient, a melt zone for softening at least one excipient to form a viscous mass or melt and a fragmenting zone for fragmenting and cooling the viscous mass into cooled fragments and an extruder outlet for recovering the cooled fragments from the extruder.
Abstract:
The invention discloses an apparatus for producing microcellular foams, the apparatus having an extruder cylinder (1) having an extruder screw (2) therein provided with a spiral flight (2b) and running around a core (2c), and a feeder unit (8) suitable for feeding a polymeric base material and connected to an inlet (8a) formed on the cylinder (1) and communicating with an inner space (5) delimited by the cylinder (1) and the extruder screw (2), an extrusion outlet (8b) being formed on the cylinder (1), and the apparatus further comprising means for feeding a foaming agent into the inner space (5) and means for rotating the screw (2), in which the essence of the invention is that the means for feeding foaming agent is at least one nozzle (3a) connected to a bore hole (3), a nozzle orifice (3aa) of which, opening into the inner space (5), is situated between a surface (2c1) of the core (2c) and an inner surface (1a) of the cylinder (1) in such a way that the distance between the nozzle orifice (3aa) and the surface (2c1) is greater than 0.
Abstract:
A kneading segment 1A according to the present invention is provided in each of a pair of kneading screws rotatably accommodated in a barrel 2 having a cavity therein and rotates in the same direction along with the kneading screw so as to knead a material supplied into the barrel 2, wherein the kneading segment includes at least two kneading flights 11A protruding outward in the radial direction, and a ratio of a root diameter with respect to the curvature radius of the cavity of the barrel 2 is 0.6 or less. According to the present invention, it is possible to obtain the kneading segment that increases a flow having a high elongation degree.
Abstract:
In a method and an apparatus for increasing the intrinsic viscosity of a polycondensate melt at negative pressure, the melt enters a chamber (25), in which a negative pressure of less than 20 mbar prevails, through a perforated plate or a screen (16) having a plurality of openings (26) with a diameter of less than 0.5 mm. The melt passes through this chamber (25) in free fall in thin threads and remains in a reservoir (19) beneath the chamber (25) for at least one minute. The melt is moved constantly in the reservoir (19), and discharged from the reservoir (19), by a helical mixing and discharge part (27).
Abstract:
A mixing rotor includes: a rotor shaft portion that includes a cooling passageway formed therein, and a mixing blade portion that is formed in an outer circumferential portion of the rotor shaft portion, wherein each of the long blades of the mixing blade portion includes a land portion as an end surface of the long blade facing a radially outside of the mixing rotor, a length of each of the long blades in the axis direction is set to be 0.6 times or more as large as a length of the mixing blade portion in the axis direction, a biting angle of each of the long blades is set to an angle equal to or smaller than 31°, and a center angle with respect to a land width as a width of the land portion in the cross-section of each of the long blades orthogonal to the axis direction is set to an angle equal to or larger than 7°.
Abstract:
A decompression screw for rubber compounds processing is described, characterized in that the screw core diameter in melting and metering section (3), in direction from feeding section (2), to the end of the melting and metering section (3) is decreasing, and/or the pitch of the helix in the melting and metering section (3), in direction from feeding section (2), to the end of the melting and metering section (3) is increasing, and ratio of the channel volume from the feeding section (2) to the channel volume at the end of the melting and metering section (3) is in range of 0,8 to 1.