摘要:
A preheating screw for the simultaneous mixing and heating of fine-grained or paste-like substances, in which intensive heat transfer takes place during transport of the substance by use of a rotating hollow screw that is filled with a heat-transfer medium, preferably a fluid, heat being transfered from the heat-transfer medium to the product by way of the heated hollow screw. An electrical heating device is installed in a hollow screw shaft, and is supplied with electrical energy via sliding contacts positioned on the outside of the screw shaft.
摘要:
Rotor zone cooling method for channeling liquid coolant flow in rotors in continuous mixers provides for predetermined zones along the lengths of the rotors to be cooled as may be desired and provides for other predetermined zones to remain neutral. A sequence of alternating cooling/neutral/cooling/neutral/cooling/neutral zones can be provided, including zones of various possible lengths, locations and numbers of such zones for tailoring or customizing these zones to optimize temperature conditions along a rotor depending upon mixing requirements and characteristics of plastic materials being mixed. A central coolant feed tube conveys coolant from an entrance into the bore to a discharge end of the feed tube positioned near the bore terminus in a first cooling zone. Coolant flow is diverted into isolation channels within isolation tubing sections spaced inwardly from the rotor bore wall for creating a neutral zone. Coolant flow is diverted outwardly from an isolation channel through ports into a cooling augmentation channel located closely adjacent to the rotor bore wall being confined outside of a cooling booster tubing sections. Coolant is diverted to flow outwardly from an isolation channel into an augmentation channel and thereafter coolant flow is diverted inwardly from the augmentation channel.
摘要:
A plasticizing extruder having a pair of counterrotating worms in a housing with the helical ribs thereof interengaged in which respective axial zones of the worms are individually heated to respective temperatures and with the height of the rib means on each worm being decreased in at least one selected axial region of the respective worm.
摘要:
An improved rotary joint comprises an assembly wherein all of the fluid-passing and heat-exchange communicating tubes, which are concentrically assembled and circumferentially rotatable as a unit, rotate as a single unit in and with the roll or screw being heated and/or cooled and the tubes terminate at their feed inlet and vent exhaust ends within a fixed housing. Reduced wear is noted for this variety of joint which is advantageously employed for the feeding of various heat-exchange liquids or other fluids to milti-zone extruder screws or the like, and for analogous applications.
摘要:
A FEED SCREW FOR ADVANCING A THERMOPLASTIC RESIN HAS AN INTERIOR BORE THROUGH WHICH A COOLING MEDIUM IS ADAPTED TO BE CIRCULATED BY CONDUITS ENTERING FROM AN OPEN ENTRANCE END OF THE BORE. ADJUSTABLE MEANS INSERTED INTO THE BORE FORMS A DESIRED BORE SEGMENT THROUGH WHICH THE COOLING MEDIUM IS FREELY CIRCULATED, THEREBY PROVIDING A DESIRED TEMPERATURE GRADIENT ALONG THE SCREW LENGTH.
摘要:
The present disclosure relates to an oral, extended release, abuse deterrent pill containing at least one active pharmaceutical ingredient susceptible to abuse which is homogenously spread throughout a matrix used to deter abuse. The pill can be prepared using a hot melt extrusion process and a forming unit. The formed pill meets regulatory guidelines for extended release formulations and is abuse deterrent to parenteral administration due at least to particle size, viscosity, or purity limitations.
摘要:
A method of extruding a mixture made of a granulate, chips, or powder, etc. of a first thermoplastic and a second thermoplastic is described, the melting range of the first thermoplastic differing from the melting range of the second thermoplastic, using an extruder which has a heatable housing and a screw, which has an intake zone, a melting zone, a delivery zone, and a hole, extending from the intake zone up to the delivery zone, into which a temperature control media may be introduced, in which the temperature control medium causes heating of the screw in the intake zone to a temperature below the melting range of the thermoplastic having the lower melting range and temperature control of the screw in the delivery zone to a temperature which lies between the melting range of the first thermoplastic and the second thermoplastic.
摘要:
A screw extruder (10), including a barrel assembly (12) having a central bore (36) which defines an inner surface (37). An extruder screw (38) is positioned within the barrel assembly's (12) central bore (36). The barrel assembly (12) has an input end (20) which includes a feed housing portion (25), the feed housing portion (25) having an opening for introduction of material into the central bore (36). There is a shaping die (18) situated at the output end (16) of the barrel assembly (12) to shape the extruded material. The feed housing portion (25) also has one or more groove channels (44) opening into the inner surface (37) of the feed housing portion (25) with a key (48) disposed in each of these groove channels (44). Contacting each key (48) are one or more independently activated actuators (28) which can be used to adjust the radial depths of the keys (48) in the groove channels (44) thus controlling the depth of grooves (46) formed between the keys (48) and the central bore (36) of the barrel (12). A control loop may be established by monitoring a process parameter such as barrel assembly pressure by a sensor (32). This data is fed to a process controller (34), which then adjusts the actuators (28) independently to control the groove (46) depths and thus control the process parameter. Also disclosed is a method for controlling extrusion from a screw extruder (10).