Abstract: A process and a degassing unit for the degassing of plastic melt in a screw extruder in which a surface of the degassing unit facing the screws of the extruder are heated to prevent deposition of entrained plastic particles, particularly at the corners or edges of the degassing unit. Prior to the commencement of the treatment process, the degassing unit is heated to a temperature which is at least as high as the melting point of the plastic to be treated. Heating can be effected by conveying a heating medium through a channel in the degassing unit located in proximity to the surface facing the extrusion screws and especially the corner or edge regions.

Abstract: A continuous, self-wiping, multiple parallel shaft processing and/or extruding system wherein material is charged to a barrel in which the shafts extend at one end and discharged at another. The barrel has an interior chamber defined by parallel intersecting cylinders providing generally V-shaped saddles at their confluence, and parallel shaft rotate within the cylinders at the same speed of rotation and in the same direction of rotation Radially co-wiping helical processing elements are fixed respectively on the shafts and are configured to also wipe the walls of said cylinders. A vent for egressing volatiles leads from the chamber, and a vent bypass passage has a first section leading from the chamber upstream from the vent, a midsection extending coextensively with the chamber within the barrel, and a return section returning to the chamber.

Abstract: Equipment for briqueting plant stalk-produce, includes a conical-screw compactor, a tubular press-cavity, an annular degassing device and a control device including a molding pressure sensor. The annular degassing device adjoins a discharge aperture of a compactor space with a plurality of narrow-axial degassing slits open to the atmosphere, which issue into the discharge aperture of the compactor space.

Abstract: Cleaning of vacuum presses is facilitated by providing a vacuum press housing that is composed of pivotable housing elements which are in turn pivotally attached to the press frame. The horizontally hinged cylinder halves that serve as housing elements of the preliminary press are connected by way of a flange connection to a sieve plate holder which is likewise arranged on a U-shaped support of the press frame so that it is pivotally movable horizontally. Arranged displaceably at the other end of the press is a joint washer with radial and lateral sealing means. The vacuum chamber which can be raised and lowered vertically and which can be pivoted horizontally is releasably connected to the joint washer by snap closure means. Pivotal movement of the vacuum chamber is ensured by a hinge connection to the U-shaped support. The vacuum chamber is placed upon the filler opening of the lower press, and is secured by means of snap closure means.

Abstract: A twin screw extruder for processing plastic material having a housing provided with a plurality of juxtaposed housing segments arranged axially in succession and defining two longitudinal, overlapping bores respectively containing two coaxially arranged extruder screws, rotatable about respective longitudinal axes, and having intermeshing threads. One of the housing segments serves as a degassing housing segment for degassing the plastic material and it is connected to a degassing chamber. The degassing housing segment has a transverse, radial opening in which an insert member is fitted, the insert member having a degassing opening providing communication between the degassing chamber and the bores in the housing. The degassing opening tapers in widening fashion in the direction from the longitudinal bores to the degassing chamber, and the degassing opening has a longitudinal axis disposed in a plane passing through the longitudinal axes of the screws.

Abstract: The process is used to remove the solvent from an elastomeric polymer solution containing at least 8% by weight of elastomeric polymer. The elastomeric polymer solution undergoes a preprocessing step in order to remove a large part of the solvent. Thereafter, the elastomeric polymer solution is fed into a main extruder in order to remove the remaining solvent. The preprocessing step includes: (a) introducing a heating fluid and the elastomeric polymer solution into a static mixer in order to mix the heating fluid and the elastomeric polymer solution and heat rapidly the elastomeric polymer solution to a temperature of 60.degree.-250.degree. C.

Abstract: A vacuum cast molding apparatus includes a plurality of vacuum chambers which can be brought into communication with each other, a plurality of depressurizing devices to evacuate each of the vacuum chambers respectively, a plurality of mixing and injecting devices installed in each of the vacuum chambers, to mix, agitate and inject molding materials into dies installed in each of the vacuum chambers, and separators installed removably between the vacuum chambers for partitioning each of the vacuum chambers. The vacuum chambers can be used independently when the separators are installed to partition them from each other. The vacuum chambers can also be used as one large vacuum chamber when the separators are removed bringing the chambers into communication with each other.

Abstract: The specification is concerned with a process and apparatus for continuous manufacture of moisture curable silicone compositions.

Abstract: In general, used thermoplastic liquid containers such as oil and solvent bottles are discarded. When recycling oil bottles, the usual practice is to wash the bottles with a solvent to remove oil therefrom. Washing of the bottles results in large quantities of used, oil-containing solvent, which present a disposal problem. A simple solution to the problem of recycling liquid containers with no preliminary washing or cleaning operation includes the steps of tumbling the bottles to promote liquid separation, shredding the bottles into small pieces and draining the liquid therefrom, grinding the pieces of plastic to yield a particulate thermoplastic, and mixing the particulate thermoplastic and any liquid remaining therein with an additive, e.g. an oil absorbent and a filler such as calcium carbonate, glass, mica or talc, and when the liquid is an oil, an absorbent to produce an extrudable mixture which can be used to form new containers.

Abstract: An extruder for elastomeric material has an axial screw in an extruder chamber defined by a cylindrical housing. Two radial planes of vented kneading pins are provided upstream of the extruder housing succeeded by spaced-apart planes of non-vented kneading pins. Each vented kneading pin includes small apertures at the inlet end of the pin which communicate with a stepped bore of gradually increasing crosssectional area from the inlet to the outlet thereof whereby gases within the elastomeric material can be vented through the apertures communicating with the stepped bore to the exterior of the extruder housing.

Abstract: A rotary extruder having an integral auger feed assembly operatively connected to the extruder barrel, the auger feed assembly being adapted to introduce feed material directly into the annular space between the rotor and barrel of the rotor extruder. The apparatus is particularly useful for feeding low bulk density feed materials to a rotary extruder.

Abstract: Polyester sheets are produced by melting a low-viscosity polyester such as a recovered polyester under reduced pressure, extruding the melt into a sheet, and stretching the sheet in the direction of width by 2.5 to 120%. The polyester resin of the oriented sheet thus obtained has an intrinsic viscosity of 0.40 to 0.63. Polyester sheets can be produced readily and continuously from recovered polyester resins or polyester resins below standards, which have a low intrinsic viscosity, and the cost of production of polyester sheets is reduced. These sheets can be formed into various shaped articles by vacuum forming, pressure forming or the like without occurrence of draw-down and without giving defective shaped articles.

Abstract: Remoldable panels of a high melting point, high tenacity thermoplastic polymer and a thermosensitive organic filler are produced by forming a mixture of polymer and filler, extruding the mixture to form a web and calendaring the web prior to its solidification. The mixture is formed and extruded in a single step by separately feeding the polymer and the thermosensitive filler into an integral mixing and extruding space that has a feed end and an extrusion end and includes a pair of co-rotating parallel elongated elements. Each of the co-rotating parallel elements has a length extending between the feed end and the extrusion end of the integral space. At least three helical extrusion sections are distanced along the length of the elements and at least two kneading sections are included.

Abstract: An apparatus for extracting a liquid from a workable mass of material includes a first screw section for transporting the material, a second screw section which applies a force on the material in a direction generally opposite that of the transport direction, and a second screw extruder at or near a liquid extraction location which provides a pinch point on the material. The pinch point substantially eliminates liquid flow countercurrent to the material transport direction.

Abstract: A device for filling molds with a casting resin or the like. An elastic casting container, with at least one fill and discharge opening, is arranged in the pressure box, which casting container selectively receives the casting resin therein from a feed pipe and delivers the casting resin to the mold through a fill pipe. The casting container is emptied by a pressure buildup inside of the pressure box, either by means of a gaseous or a liquid pressure medium. In this manner, the casting container can be loaded with the casting resin such that a renewed gas loading of the already degassed casting resin prior to the filling of the mold no longer occurs, while simultaneously limiting cleaning operations.

Abstract: A single-screw degassing extruder for thermoplastic plastics materials and rubber is provided, wherein the pin-barrel and transfer sections, which are known per se and have only been used individually hitherto, are jointly used in one extruder. Throttle pins, which are disposed in the transfer section in the region of the greatest housing thread volume, permit universal use of the extruder in respect of the extruded material or combinations of extruded material and stripping agent, since the mixing efficiency of the extruder and the pressure of the extruded material upstream of a degassing opening in the extruder are thereby advantageously controllable.

Abstract: A supply device for supplying a friction material to a conveyor provided in a devolatizing device. The friction material is agitated by an agitator and discharged therefrom to the conveyor. The supply device includes a pair of roller members each having at its outer periphery a plurality of annular grooves and a plurality of annular land portions. The annular grooves and the land portions extend circumferentially of the roller member and alternate. The axes of the pair of roller members are disposed parallel to each other. The land portions of one of the two roller members are engaged respectively in the annular grooves of the other roller member, and the land portions of the other roller member are engaged respectively in the annular grooves of the one roller member.

Abstract: A method for reverse degassing a melt of thermoplastic plastics material and an extrusion device therefor. Thermoplastic plastics materials are fed into the extrusion device either in the form a melt or as a granulated, which latter is fused to form a melt. A portion of the melt is separated from the main melt stream. The extrusion device includes, in a downstream direction, a return-blocking zone, a degassing zone, a feed zone and a conveying zone. The separated portion is removed from the feed zone, the conveying zone or even a feed conduit leading into the feed zone if the material is already molten. The extrusion device also includes screw means rotating in a barrel. The screw has at least two different flight portions, one in the returning-blocking zone and the other in at least the degassing zone.

Abstract: A method of degassing a molten mass of thermoplastic, plastics material containing residual monomers and a twin-screw extruder capable of effecting such degassing. A molten mass of plastics material and a stripping agent are intermixed at a pressure which prevents the stripping agent from changing from liquid to gas at the temperature of the molten mass. The pressure necessary is achieved by the use of a pressure restrictor, which is yoke-shaped and is connected to the extruder housing in a force-fitting manner using centering means but which effectively blocks the processing chamber of the extruder downstream thereof to the molten material with the exception of a maximum of two throughbores for such material.

Abstract: A vent housing for use with an extruder having a rotatable screw positioned within a tubular barrel. The vent housing includes a vent passageway that provides communication between the interior surface of the extruder barrel and a source of reduced pressure in order to draw from within the barrel any gasses and vapors that might be generated or liberated during plastication. The inlet portion of the vent housing is spherically recessed to provide a gap or recess between the barrel inner surface and the vent passageway inlet. The longitudinal axis of the vent passageway is offset from the longitudinal axis of the vent housing axis, and the vent passageway inlet is positioned on the upstream side of the vent housing, relative to the direction of flow of plasticated material.

Abstract: A supercritical fluid such as CO.sub.2 is injected under pressure into a fully cooked dough in an extruder. The dough is prepared and after being preconditioning with water and steam, is supplied to an extruder/cooker where it is subjected to high cooking temperatures, which may be on the order of 120.degree. C. The cooked dough is conveyed through an optional steam vent section and is cooled to a temperature of usually less than 100.degree. C. to prevent puffing of the extruded product by the conversion of water to steam. Supercritical CO.sub.2 is injected into the cooked and cooled dough, and under the pressure conditions existing in the extruder, the CO.sub.2 dissolves into the water phase of the dough. Since the conditions within the extruder are either subcritical or near-critical, various flavors, colorants, or other materials soluble in and carried by the supercritical CO.sub.2 are deposited and mixed into the dough before exiting the extruder. The dissolved CO.sub.

Abstract: A multi-shaft thin-layer reactor for treating fluid materials in which gaseous material is present during such treatment. The treatment involves the addition of gas to the fluid material or the removal of gas therefrom. The reactor includes a housing in which a plurality of axis-parallel conveying shafts are disposed. The housing is cylindrical and the shafts are disposed around the inner periphery thereof in such a manner that each shaft meshes with the two shafts adjacent thereto. The meshing shafts jointly define the outer periphery of a treatment chamber within the housing. At least one sun-and-planet roller extrusion assembly rotates the shafts and is adjacent at least one end of the shafts in a form-locking manner. The conveying shafts also scrape against the internal wall of the housing so that thin layers of the fluid materials fed into the reactor are formed and these thin layers become disposed on the conveyor shafts.

Abstract: Fiber-reinforced polymer compositions containing resin components including (a) 30-90 weight % of polyamide resins, and (b) 10-70 weight % of polyolefins+unsaturated carboxylic acid-modified polyolefins, based on the resin components; and (c) 5-50 parts by weight of glass fibers per 100 parts by weight of the total compositions, a molar ratio of end amino groups in the polyamide resins to carboxyl groups in the modified polyolefins being 10-1000. The compositions have a morphology in which polyolefin domains having an average size of 0.5-5 .mu.m are uniformly dispersed in polyamide matrix phases.

Abstract: An apparatus for treating molten material wherein a gas is present during such treatment either by being removed from the molten material or by being added thereto. The apparatus comprises a housing having a continuous spindle or a pair of spindles disposed therein. The continuous spindle is externally threaded at least in its end regions, and the pair of spindles is externally threaded. A plurality of planet spindles are dispoed circumferentially around the spindle are spindles. The planet spindles are also threaded and intermesh with one another as well as with the spindle or spindles. Furthermore, the internal wall of the housing is threaded and intermeshes with the threaded planet spindles. A treatment chamber is defined within the housing and the planet spindles define a wall surface of such chamber. The intermeshing components produce thin layers of the molten material which is carried, by the planet spindles, into the treatment chamber.

Abstract: The invention relates to a process for the processing of a thermoplastic polycondensation polymer by supplying the polymer in finely distributed form to a first vented extruder in which the polymer is devolatilized at a temperature below its melting temperature. The polymer is then placed in a second extruder where the polymer is transported below the melting temperature of the polymer over a first length of the screw from the inlet of the extruder, with constant evacuation of volatile components by means of a vacuum exhausting device at a vacuum of less than 10 mbar and the polymer is compressed and melted over a second length of the screw and then leaves the extruder as an end product of a semimanufacture.

Abstract: The removal of impurities, for example monomeric low-molecular substances, solvents or the like, from polymeric synthetic plastics materials takes place by the admixture of extraction gas in a first extruder in a supercritical state. The mixture is transferred to a second extruder where, in a first separating zone, and by a counter-current method, it is cleansed of the major part of the extraction gas containing the impurities, this being passed through a discharge orifice. Separation of any residue takes place in a vacuum zone on the downstream side. The high pressure in the first extruder is maintained by a counter-pressure valve in the connecting pipe between the first and second extruders. By the separation of contaminated extraction gas from molten synthetic plastics material in a closed space, namely the second extruder, it is possible to achieve an ordered dissipation of extraction gas on the one hand and molten synthetic plastics material on the other hand.

Abstract: A rotating spinning centrifuge is described for spinning yarns of a filament forming spinning material and which includes a centrifugal wheel and an elongate tubular central inlet sleeve fixed to the wheel. A pump is mounted in the inlet sleeve which serves to supply the spinning material under pressure and in a liquid state to the centrifugal wheel, and the pump is preferably designed and constructed as an extruder pump which includes an extruder screw and defining a rotating cylindrical jacket so that the spinning material is advanced under pressure to the centrifugal wheel.

Abstract: A distributor for a falling strand devolatilizer which is a closed top upwardly facing projection having one or more inclined faces and being centered on a tray having strand forming holes there through. The distributor holds polymer melt in a devolatilizer for a longer period of time resulting in lower levels of monomer, oligomer, and diluent in the treated polymer.

Abstract: A method and an apparatus for extruding a ceramic batch supplied from a vacuum auger machine into a formed body by a plunger molding machine, wherein the temperature distribution of the ceramic batch at the outlet portion is measured and is controlled so as to supply the ceramic batch having substantially a uniform temperature to the plunger molding machine from the vacuum auger machine.

Abstract: Described herein is an internal mixer of the type including a mixing chamber rotatably accommodating mixing rotors therein, a hopper frame erected on the mixing chamber, a charge hopper provided on one lateral side of the hopper frame for charging a mixing material therethrough, and a floating weight provided in the hopper frame for upward and downward movements therein, the floating weight being held in an upper lifted position when charging a mixing material into the mixing chamber and then lowered into a pressing position in a mixing stage to apply pressure on the charged material in the mixing chamber, wherein the floating weight is dimensioned to have an axial length sufficient for closing an inlet opening formed in the side wall of the hopper frame in communication with the charge hopper, when in the lower pressing position, and lift means for lifting the floating weight up and down in the hopper frame is provided separately from a pressing means with a function of pressing the floating weight resilient

Abstract: A method for extruding polyvinyl alcohol which includesadding sufficient energy to the polyvinyl alcohol to both melt it and essentially eliminate the crystallinity in the melt, andsimultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol andrapidly cooling the extruded melt reduces the heat history and improves the resulting color of the extrudable polyvinyl alcohol.

Abstract: Disclosed is a process for the preparation of a modified methacrylic resin molding material, wherein a volatile component is removed from a methacrylic polymer composition containing a volatile component including an unreacted monomer, a solvent or a by-product, and a modifying polymer is added to the methacrylic polymer composition to prepare a modified molding material.

Abstract: A finishing process for water-slurried elastomers wherein a partially dewatered elastomer is presented to an enclosed, low shear, self-cleaning, long residence time dryer for drying at low temperatures in order to remove the remaining water and residual volatiles. The dried product is then cooled in a pneumatic conveyor to temperatures required for baling.

Abstract: An apparatus for supplying a resin material to molds of a resin press molding machine includes a supply cylinder for supplying the resin material to the molds, resin material charge hopper mounted to the supply cylinder, a plunger for extruding the resin material within the supply cylinder, a drive device for moving forward and backward the plunger in an axial direction, an opening and closing device for opening and closing an opening of a fore end of the supply cylinder, and a die positioned between the opening and closing device and the molds to form the resin material into a predetermined shape.

Abstract: A method for manufacturing molded products of thermoplastic material by injection molding or extrusion molding a material containing a thermoplastic material as a primary component and a second polymer or a blend of the thermoplastic material and second polymer as a primary component and an inorganic material. The material is molded under the following mold conditions by a general type or vent type molding machine. The material is provided with a water content of less than about 1% by weight. The wall temperatures of the molding cylinder are controlled at different locations of the molding machine. The residence time of the molding material in the cylinder is controlled in response to the cylinder temperature so that the residence time is reduced as the temperature is increased whereby the residence time of said material in the cylinder is less than about 23 minutes. The temperatures of the discharge end is maintained within the range of plus 35.degree. C. or minus 25.degree. C.

Abstract: An extrusion head for processing rubber or thermoplastic plastics material including a housing flange-mountable on a screw extrusion device. The head further including an inlet region for receiving material from the extrusion device and for receiving the downstream end of the screw, the inlet leading into a flow channel portion and a nozzle outlet which receives the material from the flow channel for extrusion in the form of a shaped profile. A sealable air discharge device is disposed in the flow channel portion to remove air bubbles, particularly that which is formed during the start up phase of the extrusion downstream of the downstream end of the screw.

Abstract: In an extruder for processing material to form an extruded product, the extruder including an elongated extruder barrel having a material inlet end and an outlet end remote from the inlet end, and a pair of elongated, axially co-rotatable, flighted extrusion screws within the barrel for moving materials from the inlet end towards and through the outlet end, the barrel is provided with a pair of parallel bores which are formed with spiral grooved surfaces along at least a portion of their lengths. An inlet opening is provided adjacent the inlet end of the barrel such that one of the co-rotating screws of the extruder rotates in a direction outward and downward from the inlet opening and the other screw rotates upward and toward the inlet opening. The bore receiving the upturning screw is provided with a smooth surface region adjacent the opening which prevents material entering the inlet opening from being delivered back into the opening by the upturning screw.

Abstract: Spiro(bis)indane polycarbonates, including homo- and copolycarbonates, are devolatilized by extrusion under conditions of low viscous dissipation and low residence time. By this method, volatile impurities including spiro(bis)indane cyclic dimer may be removed.

Abstract: In the case of the extruder, the thread of the screw, or that of the screws, is partly left-handed and partly right-handed, so that one part of the material to be processed is conveyed in direction A, while the other part is conveyed in the opposite direction B. The process is a degasifying-extrusion-process and the extruder is a degasifying extruder. The apparatus includes a reverse-degasifying assembly (7,22) at the end (8,19) of the screw (1,16), or screws (1,16), if the material to be processed is carried away from this end, and/or a reverse-degasifying assembly (41,52) at the location between the threaded sections of the screw (1,16) or screws (1,16), so that the material to be processed is carried away in opposite directions B and A.

Abstract: A devolatilizer, especially suitable for high viscosity polymers, comprising a vacuum chamber into the top of which the polymer is introduced after having passed through a tubular or equivalent heat exchanger, with a low shear mixer located in the vacuum chamber and a pumping device for removing the devolatilized polymer from the bottom of the vacuum chamber. Devolatilization of high viscosity polymers is achieved in this apparatus and method without severe degradation.

Abstract: In a vent type injection molding machine having a screw contained in a heating cylinder, there are provided a plurality axially spaced apart vent openings located at intermediate points of the heating cylinder for venting inside of the heating cylinder to the outside and control means for selectively opening and closing the vent openings in accordance with the position of the screw in the heating cylinder or the pressure of a thermoplastic resin injected by the injection molding machine.

Abstract: Ionomers can be injection molded and extruded in wet condition using a vented, two-stage barrier screw wherein the barrier flight melt channel is operated only partially filled.

Abstract: The process uses a vented barrel to decrease the mositure content of the ionomeric resin cover stock prior to injection molding of a golf ball cover or the formation of semi-circular cover halves. The vent is located at a point on the barrel where the temperature of the melted ionomeric resin melt is between 400.degree. F. (204.degree. C.) and 500.degree. F. (260.degree. C.). The venting drops the moisture content of the ionomeric resin to below 800 ppm.

Abstract: The invention relates to a process and a device for degassing and converting into pellets polyolefins from a gas-phase reactor.A device according to the invention comprises, in combination (FIG. 1):a reactor (1) for the catalytic polymerization in the gas phase of alpha-olefins, equipped with a polyolefin outlet (9);A device (12) for primary degassing by separation of the solid and gas phases, connected to the said outlet;A device for secondary degassing (14) to substantially free the particles of the gases accompanying them and which is connected to the outlet of the primary degassing (12) and which comprises a mechanical stirrer (14a) making it possible to raise the temperature of the particles to a temperature close to the minimum sintering temperature by conversion of the mechanical energy into heat;and a device (15) for pelleting the particles by extrusion through a die, this device being connected to the outlet of the said secondary degassing device.

Abstract: A process includes first preparing an adhesive composition containing electron beam-curable PSA polymer matrix, fillers and solvent. The composition is introduced and conveyed through a twin screw extruder. In the extruder, solvent is removed in one or more solvent removal units, and a solvent-free composition is extruded as the carrier layer. Skin layers may be co-extruded with the carrier layer.

Abstract: A method of degassing thermoplastic plastic melts over a wide range of viscosities in a degassing extruder including a plurality of sequential degassing sections. Each degassing section includes at least one screw section having flights formed thereon. Each section includes a degassing region and a metering section downstream thereof. The height and length with which the flights are filled in the degassing regions in the individual degassing sections is controlled by the comparison of a pressure gradient measured in the metering region of that section with a desired pressure gradient and on the basis of this, the melt is conveyed with substantially the same throughput capacity in each degassing section. As a result of these measures, the degassing is effected in all of the degassing sections with optimally partially filled screw threads and with an optimum filling length of the worm threads, which is independent of the viscosity of the melt.

Abstract: An apparatus including a single screw extruder for extruding a fused molten mass of thermoplastic material and for reverse degassing the melt. The device includes an extrusion screw rotatable in a hollow cylindrial barrel, and a hopper for introducing the melt into the barrel. The screw has at least one flight for conveying the introduced melt and a return delivery flight disposed upstream, in the direction of extrusion, of the hopper. Reverse degassing of the melt is effected by a vacuum source disposed upstream of the hopper in communication with the return delivery section, and provided with a degassing dome generating a reduced pressure or vacuum. At least one radially adjustable separating member for effecting mechanical separation of fused mass from the gas is provided in at least one location in the return delivery section. The method includes degassing of the melt by producing a reduced pressure in the return delivery section. The gas extracted from the melt is discharged.

Abstract: A steam venting extruder feeder is provided for gravity feeding of flowable solid materials into a food extruder downstream of the first normal first zone feed port. The steam venting extruder feeder feeds the material down a tube while simultaneously venting steam from within the extruder around the periphery of the feed tube inside an outer tube in which compressed air is forced to assist in the flow of steam and pulls air in with the feed material preventing steam condensation and build-up in the feed tube.

Abstract: A dental mixer apparatus including an upright mixing chamber having an upper open end for receiving dental impression materials and a plunger member suspended coaxially upon an elongated rotary driven mixer shaft for vertical reciprocable movement between a lower operative position in which the plunger is received within the mixing chamber and an upper inoperative position above the mixing chamber. A rotary mixer head is driven by the mixer shaft below the mixing chamber for mixing the materials within the mixing chamber. A suction conduit is provided to suck air from the mixing chamber in order to minimize voids and bubbles within the mixed ingredients. The mixer shaft is supported by a support bracket which is pivotally mounted to permit the mixer shaft and plunger to swing away from their normal vertical position above the mixing chamber to provide more working space above the mixing chamber.

Abstract: A degassification device for a screw extruder which processes plastic material in which the extruder has a hollow housing and an extruder screw rotatable in the housing, the degassification device having a pair of degassification screws disposed adjacent to the extruder screw for rotation about axes parallel to the axes of rotation of the extruder screw. A housing headpiece accommodates the degassification screws and is in communication with the extruder housing such that gas and vapor produced in the extruder housing can flow radially therefrom into the housing headpiece for discharge therefrom. The degassification screws have threads which interengage one another and they are driven in the same direction of rotation. The housing headpiece has adjacent longitudinal bores which overlap one another and respectively receive the degassification screws therein with their threads interengaged with one another.