An assembly for processing viscous material comprises a process duct extending along a longitudinal axis, wherein viscous material advances in one advancing direction, at least one pumping device provided with a stator comprising a cylindrical seat, and at least one cylindrical rotor. The at least one cylindrical rotor is housed in the stator and is coupled to the stator with a sliding seal. The rotor rotates around a rotating axis substantially parallel to the longitudinal axis and has an outer face with at least one groove, which forms with the inner surface of the stator one pumping channel. The pumping device is configured so that the pumping channel extends between at least one inlet and at least one outlet and the inlet and the outlet are in fluid connection with the process duct.

An optical resin formed body manufacturing method includes: (i) depressurizing an inside of a container holding a molten optical resin; (ii) pressurizing the inside of the container holding the molten optical resin; and (iii) shaping the optical resin taken out of the container into a given shape. The steps (i) and (ii) are sequentially performed once each or are alternately performed two or more times each. In the step (i), a duration t1 [min] of the depressurization of the inside of the container is set such that the duration t1 and a viscosity .Math.1 [Pa•s] of the molten optical resin satisfy a relation .Math.1/t1 < 200. In the step (ii), a duration t2 [min] of the pressurization of the inside of the container is set such that the duration t2 and a viscosity .Math.2 [Pa•s] of the molten optical resin satisfy a relation .Math.2/t2 < 200.

Injector (14) for injecting a liquid formulation into a molten polymer includes outlet (21) at one end and, at its other end, is arranged to be connected to upstream conduit (25) via a coupling housing (26) so that liquid formulation can pass from conduit into the injector, and further includes an elongate conduit (27) in which an elongate pin is slideably arranged being capable of expelling all liquid formulation from conduit. To address the risk the outlet could become blocked in use, whilst avoiding the need to depressurize and/or stop the flow or polymer in extruder (19), the injection apparatus includes a spool (34) which is rotatably mounted within wall (35) of the extruder and is arranged to be rotated about an axis which extends substantially perpendicularly to the elongate extent of the extruder through which a polymer stream (18) flows. The spool may be moved between a first configuration and a second configuration wherein a flow path is interrupted, but wherein molten polymer continues to flow in said polymer flow conduit.

The present disclosure relates to extruder systems and processes thereof. In at least one embodiment, a method of forming a thermoplastic vulcanizate (TPV) composition includes introducing a thermoplastic polymer to an extruder through a feed throat. The elastomeric polymer is introduced to a melt feeder and an elastomeric polymer melt including the elastomeric polymer is formed. The melt feeder is coupled to the extruder. Elastomeric polymer melt from the melt feeder is introduced to the extruder. The thermoplastic polymer and the elastomeric polymer melt are fed separately to the extruder. The thermoplastic polymer and the elastomeric polymer melt in the extruder are mixed with a plurality of intermeshing screws having a plurality of mixing zones.

Disclosed herein is a system comprising a first pump; a pelletization system that comprises an underwater pelletizer; where the pelletization system is located downstream of the first pump and is in fluid communication with it; a direct line that is located downstream of the first pump and upstream of the pelletization system; where the direct line does not contain a pump or a heat exchanger; and a bypass line that is located downstream of the first pump and upstream of the pelletization system; where the bypass line comprises a second pump; where the first pump is operative to discharge the polymer to the pelletization system via the direct line when the polymer has a melt viscosity greater than 10.sup.5 centipoise; and where the first pump is operative to discharge the polymer to the pelletization system via the bypass line when the polymer has a melt viscosity less than 10.sup.5 centipoise.

The present invention relates to water and solvent-free polymers, in particular water and solvent-free synthetic rubber products like non-halogenated and halogenated butyl rubber products as well as a process for the production thereof. The invention further relates to a device suitable to accomplish said process.

The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.

A method for manufacturing a dull polyamide 56 fiber includes steps as follows. Bright polyamide 56 chips are provided. A viscosity adjusting step is provided, wherein a relative viscosity in sulfuric acid of the bright polyamide 56 chips is adjusted to a range of 2.90 to 3.00. A moisture adjusting step is provided, wherein a moisture content of the bright polyamide 56 chips is adjusted to a range of 350 to 550 ppm. A spinning step is provided, which includes providing dull polyamide 6 chips and a blending step. The dull polyamide 6 chips include TiO.sub.2. In the blending step, the dull polyamide 6 chips and the bright polyamide 56 chips dealt with the viscosity adjusting step and the moisture adjusting step are melted and blended, and then spun at a temperature ranging from 275° C. to 285° C., thus the dull polyamide 56 fiber is obtained.

A method is disclosed for die coating a moving substrate with a high viscosity material such as a polymer. The method includes heating and mixing ingredients to form a homogenous mixture, pumping the mixture around a circulation loop with a first pump, maintaining a predetermined pressure of the mixture within the circulation loop, drawing mixture from the circulation loop with a second pump, delivering the mixture using the second pump to an extrusion die adjacent the moving substrate to coat the substrate, and controlling the second pump as a function of at least the speed of the moving substrate to maintain predetermined characteristics of the coating mixture applied to the moving substrate. An apparatus for carrying out the method also is disclosed.

A method is disclosed for die coating a moving substrate with a high viscosity material such as a polymer. The method includes heating and mixing ingredients to form a homogenous mixture, pumping the mixture around a circulation loop with a first pump, maintaining a predetermined pressure of the mixture within the circulation loop, drawing mixture from the circulation loop with a second pump, delivering the mixture using the second pump to an extrusion die adjacent the moving substrate to coat the substrate, and controlling the second pump as a function of at least the speed of the moving substrate to maintain predetermined characteristics of the coating mixture applied to the moving substrate. An apparatus for carrying out the method also is disclosed.