Abstract: Single screw extruder for making a dryer bar.

Abstract: A processing installation for devolatilization of polymer melts comprises a first extruder and a second extruder arranged downstream thereof in a direction of conveyance. The first extruder comprises several rotatably drivable first shafts which are provided with first treatment members and several devolatilization zones with associated devolatilization ports. Correspondingly, the second extruder comprises several rotatably drivable second shafts which are provided with second treatment members and several second devolatilization zones with associated devolatilization ports. The first treatment members have an external diameter which is smaller than or equal to that of the second treatment members. A devolatilization unit is arranged in a transfer zone which interconnects the extruders. The devolatilization unit comprises a perforated plate and a clearance arranged downstream in the direction of conveyance.

Abstract: The invention relates to an apparatus for extruding thermoplastic material, comprising an extruder screw (2) which is mounted in a housing (1), comprises a plasticizing section (P) on the inlet side, a degasification section (E) upstream of an outlet section (A), a flow arrester (S) between the plasticizing section (P) and the degasification section (E) with a screw section with a counter-rotating delivery flight (3), and at least one flow channel (5) bridging the flow arrester (S) and containing a melt filter (4). In order to reduce the driving power of the extruder screw (2) it is proposed that a sleeve (7), which encompasses the screw (6) and is mounted in the housing (1) in a rotationally fixed manner, is associated with the screw section that forms the flow arrester (S), and the screw (6) in the screw section of the flow arrester (S) has a smaller screw diameter in relation to the plasticizing section (P) and preferably also to the degasification section (E).

Abstract: Improved single screw extruders systems (40) are provided including a single screw extruder (42, 92) as well as an upstream preconditioner (44). The extruders (42, 92) include a single, internal, elongated, helically flighted, axially rotatable screw assembly (52) having one or more improved screw sections (74, 74a, 76). The screw sections (74, 74a, 76) include specially configured flighting (86) wherein adjacent flighting portions (86a, 86b) have smoothly arcuate surfaces (88) extending between the respective flighting portion peripheries (90a, 90b). This flighting design provides smooth, substantially surge-free operation while increasing SME and cook values. The preferred preconditioner (44) has independently controlled mixing shafts (106, 108) allowing the shafts (106, 108) to be rotated at different rotational speeds and/or directions.

Abstract: A mixing device for synthetic leather to joint with a solid powder material includes a material mixing unit and a stirring and conveying unit. The material mixing unit includes a mixing body and two feeders. The mixing body is connected with the two feeders and has a mixing chamber therein which is intercommunicated with the two feeders. The stirring and conveying unit is connected with the material mixing unit and has a stirring and conveying chamber therein which is intercommunicated with a solid material container and the mixing chamber. Thereby, a solid powder material, a first material and a second material are respectively disposed in the solid material container and the feeders, and then guided into the mixing chamber to be well mixed for forming a mixture. The mixture is manufactured to form synthetic leather containing the solid powder material.

Abstract: The invention relates to a device for the extrusion of thermoplastic synthetic material featuring an extruder screw (2) which is mounted on a housing (1) including a plasticizing section (P) at the inlet side, a degassing section which is mounted upstream on a discharge section (A) and a conveying outlet (3) operating in the opposite direction which is located between the plasticizing section (P) and the degassing section (E). A flow channel (5) that contains a melt filter (4) is bridged over by at least one of the conveying outlets (3) in the opposite direction. To create favorable production conditions, the extruder screw (2) forms a similar conveying outlet (7) operating in the same direction between the conveying outlet (3) in the opposite direction and the downstream port (6) of the flow channel (5). The housing (1) has at least one degassing vent (8) at the transition area of the conveying outlet (3) operating in the opposite direction and the conveying outlet (7) operating in the same direction.

Abstract: The apparatus is provided for impregnating a melt of polymer with a fluid working medium, such as, an expanding agent or an additive. Impregnation is carried out for the purpose of manufacturing foamed shaped parts using an injection molding machine. The impregnating body includes at least one melt channel formed in a gas permeable segment and a channel system for fluid infeed. The gas permeable material, e.g. sintered metal, separates the fluid from the stream of melt in the melt channel(s). Each melt channel has open pores at its inner surface which enable the impregnation. The melt channels can contain static mixers in the stream of melt to promote the distribution of the diffused fluid in the flow of melt.

Abstract: An improved twin screw extruder device (14) is provided which is capable of producing a wide variety of high quality extrudates having greatly varying final properties, without the need for extensive machine modifications. The extruder (14) includes a barrel (16) together with a co-rotating twin screw assembly (22). The assembly (22) is made up of a pair of screws (50, 52) having central, tapered shafts (54, 56) equipped with outwardly extending helical flighting (58, 60); the screws (50, 52) are non-parallel and are positioned so that the flighting (58, 60) thereof is intercalated along the length of the screws (50, 52). The flighting is of specialized configuration and tapers along the length of the screws (50, 52) preferably at an angle of taper different than that of the shafts (54, 56); moreover, the width of the outer flighting surfaces (70, 72) increases along the length of the shafts (54, 56).

Abstract: An apparatus for filtering thermoplastic synthetic plastic material has a screw (5) bearingly supported within a housing (1) for rotation around its longitudinal axis for the transport and preferably also plasticizing of the synthethic plastic material. This material is supplied to the screw (5) through an intake opening (7) into the housing (1) and leaves the housing (1) through an exit opening (8). The screw (5) is subdivided into two sections (9, 10) disposed one behind the other in axial direction. A filter (40) provided with penetration openings (25) is disposed in the flow of the synthetic plastic material that is disposed between these two sections (9, 10), which filter (40) is disposed within the housing (1) between the two sections (9, 10) of the screw (5) so that it subdivides the interior of the housing. The filter (40) is connected for common rotation with at least one of the screw sections (9, 10).

Abstract: With the same screw diameter as in conventional screw extruders, the screw length is reduced, whereby the material residue is reduced, the throughput is increased, the screw motive power is reduced, the temperature control is facilitated to prevent rubber scorching, and extrusion molding of a vulcanizalbe rubber composition is made possible at a lower temperature.

Abstract: An improvement in a process of making honeycomb articles, which process utilizes a co-rotating, intermeshing twin screw extrusion apparatus to mix, screen, and extrude a batch of ceramic materials through a die, the improvement which comprises the steps of separating the mixing and screening phase from the extrusion phase, by passing the batch through a first co-rotating, intermeshing twin screw extruder or a mixer extruder to mix and screen the batch, and then directly passing the mixed and screened batch through a second co-rotating, intermeshing twin screw extruder or a pumping extruder to extrude said batch through a die assembly to produce a honeycomb article.

Abstract: An extrusion system is provided with a screen changer between in-line screw sections. An in-line seal diverts high pressure, high temperature foamable material toward the screen changer. The seal may have reverse flights to provide a visco-dynamic seal. The screw sections and the seal may be located in a common barrel housing. The screw sections and the seal may be integrally rotated as a single in-line unit. A device including an injection valve may be attached to the upstream screw section to introduce a foaming agent into the material being extruded.

Abstract: An apparatus and process for chopping and mixing a polymeric material having an elongated hollow barrel element with a material inlet end and a material outlet end and housing a rotatable extruder screw. The rotatable extruder screw includes at least one flightless screw section and at least one stationary tube element made from a bearing material and forming a plurality of serrations at at least one end, the stationary tube element being disposed around the flightless screw section within the elongated hollow barrel element and fixed against rotation with respect to the elongated hollow barrel element. The flightless screw section forms at least one material melt recess in a region corresponding to the serrations of the stationary tube element. Extruded products requiring, and characterized by, low shear, uniform dispersive mixing are made in one process step in a single screw extruder employing this invention.

Abstract: A cooking-extruding apparatus and method for the cooking-extrusion of biopolymers for the production of thermally treated food granulates, snack products, cereals or similar products. The cooker-extruder having a feeding hopper, a conveying screw, an exit nozzle, and at least one spatula-pump disposed between the conveying screw and the exit nozzle. Each spatula-pump includes a spatula element and plate having a matrix of holes. In operation, the spatula element assists the material being processed through the plate having a matrix of holes. An embodiment of the apparatus of the present invention includes the use of two conveying screws. The spatula-pumps are arranged serially such that the material being processed passes through one spatula-pump to the next until it is passed through the exit nozzle of the apparatus.

Abstract: A throttle for the adjustment of the pressure of plastic material in screw extruders in which the throttle is a cylindrical plunger submerged in the melt flow in a melt channel. In order to eliminate dead spaces downstream of the throttle, the plunger is arranged in a symmetrical and displaceable manner in a rectangular melt channel and one or more through holes are provided in the plunger in the flow direction in the submerged region of the plunger.

Abstract: Assembly for the continuous plasticising and filtration of materials. The materials include polymers in the pasty, viscous, or molten state, visco-elastic products and proteoleaginous products. The assembly includes two modules, a plasticising module and a degassing and filtration module. A stator accommodates a floating screw and, in succession, a feed zone receiving the material to be plasticised, a homogenization zone, a degassing zone, a zone for the filtration of the non-molten material, and a zone for the outlet of the plasticised material. The portions of the stator which correspond to the various zones are provided with temperature regulating means, formed of a condenser, a heating device, and an annular chamber.

Abstract: An apparatus for filtering and extruding plastic scrap consists of an extruder housing having an interior chamber and an extruder worm received and supported for axial rotation in the chamber. The extruder worm includes a centrally located set of return threads which divide the chamber into first and second chamber portions. The housing further includes an intake opening in the first chamber portion for receiving raw material, an exit opening in the second chamber portion for discharging filtered material, and a degassing opening in the second chamber portion for discharging gasses from the chamber. A drive mechanism is provided for rotating the extruder worm. A filter channel connects the first and second chamber portions wherein the plastic material passes from the first chamber portion to the second chamber portion through the channel. The channel has an inlet opening in the first chamber portion and an outlet opening in the second chamber portion.

Abstract: An extruder for processing plastic material has a housing with a longitudinal bore in which an extruder screw is coaxially fitted for rotation around an axis of the screw to advance plastic material through the bore by threads on the screw. A plurality of throttling plungers are slidably supported in rectangular slots in the housing perpendicular to the axis of the screw. The throttling plungers define an inner throttling surface facing an outer thread-free region of the screw to form an annular throttle gap therewith. In order to avoid uncontrolled changes in the throttling system, the throttling surfaces are not concentric with the outer surface of the screw, so that the throttle gap has a width which varies progressively and symmetrically around the screw.

Abstract: A compact and precision extrusion system for extruding strips of rubber compounds with profiles of accurate dimensions. Strips of rubber compound are uniformly heated and mixed in an extruder and then passed through a low pressure drop strainer to remove foreign matter. The strained compound then is fed directly into a gear pump which delivers precise volumes of the rubber compound immediately into the spread chamber of an extrusion head after which it passes through a die to form a precise strip of the rubber compound. The strainer and extrusion head are movably mounted with respect to the gear pump for axial separation from the gear pump for easy removal of the rubber compound from the various components of the system to facilitate compound changes. A control system regulates the speed of the extruder to provide a near constant pressure at the entrance port of the gear pump to precisely regulate the rate of extrusion of the compound from the extrusion head.

Abstract: A synthetic-resin article is molded by plastifying a virgin granulate into a fluent stream and plastifying a recycle granulate into another fluent stream. The recycle stream is then filtered while still plastified to removing particulate impurities from it. Then the filtered recycle stream while still plastified is combined with the virgin stream to form a combined stream and the combined stream is fed into a mold. The stream is mechanically filtered.

Abstract: A compression head for a machine for continuously densifying vegetable matter, wherein radial or virtually radial bars are included in the front face of the disc of the head and are made of a material presenting a coefficient of friction greater than that of the material of which the disc is made. The outer face of the bars is shaped so that the conventional ribs on the front face of the disc are continuous through the bars.

Abstract: An apparatus having a cylindrical structure which has therein a rotary shaft extending along the axis of the cylindrical structure to project beyond the lengthwise end portions thereof, and a plurality of dispersion chambers and an arbitrary number of rectifying chambers arranged along the rotary shaft can be used for continuous dispersing in the manufacture of several products. Each of the dispersion chambers and rectifying chambers consists of a space defined by the circumferential surface of the rotary shaft and between adjacent distance collars. Each of the distance collars is fixed at its outer circumferential surface to the inner surface of the cylindrical structure, and forms at a part of its inner circumferential surface in cooperation with the circumferential surface of the rotary shaft an annular slit which constitutes a passage for a material current.

Abstract: A screw for use in an extruder barrel for plasticizing plastic material from a solid phase to a viscous form wherein the feed screw has a cylindrical core with a helical flight extending for the full length of the screw. A selected portion or portions of the screw's core has a polygonal cross section whose apexes are parallel to the axis of rotation of such screws to thereby more precisely control the plasticizing action of the plastic material, its viscosity and temperature while providing a thoroughly mixed and homogeneous melt.

Abstract: Apparatus is disclosed for the separation of admixtures from contaminated thermoplastic materials. The apparatus has a distributor screw, a retainer chamber and return flow holes for contaminated materials to pass from the retainer chamber into an annular space formed between the distributor screw and the screening element within the pressure chamber. The materials circularly travel around saw-like teeth of the distributor screw and back through the flow holes into the retaining chamber. The retainer chamber and the annular space are openly connected to each other at the inlet side of the pressure chamber. Purified materials exit through one outlet exit and admixtures exit through a second exit.

Abstract: A method for extruding and/or refining soap, which comprises supplying soap to one end of a helix disposed in a casing and rotating the helix to move the soap lengthwise along the casing and out of the casing. The helix rotates at a speed between 20 and 50 rpm. The length of the helix is 5 to 15 times its diameter. The winding angle of the helix is between 15.degree. and 25.degree.. The helix has a diameter of about 150 mm and a helix depth between 30 and 35 mm.

Abstract: The constituents of a flow of thermoplastics material or the like are mixed and blended by passing the flow through a mixing structure which defines an array of elongate side-by-side passages. The passages are not all alike in that at least some of them have configurations which taper along their lengths to degrees or in directions that differ from the configurations of others of the passages, whereby the flows of fluid which discharge from the differently configured passages do so at differing velocities. As the discharging flows of differing velocities recombine to form a common flow having a uniform velocity, a desirable type of mixing and blending action results. In preferred practice, adjacent ones of the passages are tapered oppositely along their lengths to converge or diverge such that fluid flowing through the converging passages is caused to increase in velocity, while fluid flowing through the diverging passages is caused to diminish in velocity.

Abstract: Screw feeder or Archimedian screw for pasty materials, such as soap, wherein the winding angle of the screw ranges between 15.degree. and 25.degree., and the screw height, diameter and thrust length depend on the section of bar extrusion and/or free passage area of the refining holes.

Abstract: A kitchen appliance for and method of making farinaceous products such as spaghetti, fettucini, macaroni, manicotti, lasagna, pizza crusts, taco shells, bagels, breadsticks and like dough products, use a mixing chamber for receiving the product ingredients, a rotary mixer for mixing the ingredients, a rotary extruder for extruding the mixed ingredients through an extrusion die at a discharge outlet, and a reversible motor drive for jointly turning the rotary mixer and rotary extruder about the same axis of rotation in either circumferential direction. In one direction, only mixing is effected; in the opposite direction, extruding is effected. An arrangement for and method of adjusting the thickness of the extruded farinaceous product are also described.

Abstract: A counter current extractor in which material to be extracted is caused to move in counter current with an extracting liquid by a screw conveyor characterized in that the direction of rotation of the screw conveyor is intermittently reversed. A process for extracting soluble and dispersible materials using such a counter current extractor is also disclosed.

Abstract: In a screw extrusion device used for extruding plastics materials, a filter or tool-carrier is disposed at the downstream or outlet end of the extruder, an annular pressure element bearing on the carrier so as to secure and seal the carrier in its operative position. The carrier is displaceable perpendicularly to the flowpath of the plastics material so as to permit facile changing of the filter element. The annular pressure element is acted upon by hydraulic fluid, the hydraulic circuit including an annular pressure chamber. The inner and outer walls of the chamber are formed, respectively, by concentric metal bellows. One end of each bellows is mounted on the pressure element and the other end thereof on a housing.

Abstract: Method and apparatus are disclosed for the low energy melting, extrusion and pumping of material comprising feeding, metering, melting and mixing of such materials in an extruder having a melter screw and subsequently passing the resultant extrudate, through breaker plate and adapter means, to and through a rotary gear pump and, in turn, to a die member.

Abstract: The invention relates to a small volume outlet apparatus for multiple shaft screw machines for highly viscous materials at the discharge end of a multiple shaft screw having a sieve changing device arranged in it.

Abstract: A screw press for drying elastomeric polymers and the like having a cylindrical barrel and intermixed, substantially solid and apertured, discontinuous screw flights for more quickly initiating pressure and temperature increase of polymer in the barrel without increasing the back-up restriction and final pressure at the discharge end of the barrel.

Abstract: A filter assembly for an extrusion apparatus comprises a stationary filter having a flat, hard surface and slidable means having a plurality of apertures for both accumulating filtered debris and cleaning the filter surface when the debris is removed by sliding a clogged slide aperture out of position while replacing it with a clean aperture.

Abstract: An extruder for working rubber and other elastomeric compounds having an extruder screw with a feed section, metering section and a transition section. The transition section has a plurality of working sections in succession with each section having a pair of helical flights defining a pair of primary channels. One of such helical flights has a flight that leads off to define a secondary channel for leading off the portion of the compound subjected to a shearing action from the primary channels. The primary channels decrease in volume while their axial width remains the same. The secondary channel increases in axial width and depth to accommodate the worked rubber compound.

Abstract: The plastics processing machine employs a mixer which has a static mixing device formed of at least one insertion member composed of guide elements in layers which form flow channels. The hydraulic diameter d.sub.h is made no more than eight millimeters (8 mm) in order to obtain a high mixing quality. The hydraulic diameter may vary along the mixer, for example by decreasing from the inlet end to the outlet end.

Abstract: The invention provides apparatus for the production of cellular thermoplastic material comprising an extruder having a hollow barrel, screw means mounted in said barrel to advance material therethrough, mixer head means mounted in said barrel and gaseous blowing agent inlet means positioned in said barrel near the upstream end of said mixer head means, said mixer head means having in the surface thereof a plurality of alternate land and groove means, said land means having close clearance with the internal walls of said barrel near the upstream end thereof in the region of said blowing agent inlet means and alternately spaced and close clearance with said walls in the mixing region downstream of said blowing agent inlet means.

Abstract: A one-screw extruder in which the mechanical thrust function is assigned to a first portion of the screw and of the cylinder, and in which the uniform heating of the material to be extruded is the function of a second portion, thus making it possible for each of the two portions to be specialized and to obtain a better performance of the extruder as a whole.

Abstract: An extruder apparatus with an extrusion screw having an end member which blends molten and solid thermoplastic materials moving through the apparatus into a uniformly fluxed consistency, and a method for uniformly fluxing and blending thermoplastic materials. The extrusion screw end member is provided with a conical terminus forming an annular shoulder with openings extending therethrough.

Abstract: Aramid fiber reinforced hose having the fiber in discrete particles extruded with the elastomer to provide orientation of the aramid fibers in two oppositely helical overlapping directions. A strainer plate is located within the extruder that has a series of apertures on concentric circles with each series of apertures extending through the plate at opposite helical directions.

Abstract: Methods are provided for processing expandable thermoplastic materials with a typical compression relief design extruder screw having a helical flight for advancing and working a thermoplastic material. The screw is modified to shorten the feed and compression sections and to include a plurality of force-producing components in at least the compression section of the screw such that at least some portion of the components in any one turn of the flight lie in one plane essentially normal to the axis of rotation of the screw and such that the walls of the flight are uninterrupted. This arrangement controls the location of the rupturing or fragmenting of what is referred to as the solid bed and controls the manner in which it is fragmented to provide an extrudate at a die end of the extruder which has a constant temperature and which is uniform throughout each successive section of the thermoplastic material.

Abstract: The disclosure concerns apparatus which automatically performs screen-changing functions associated with the use of screen devices for filtering extruded plastic materials. The apparatus includes a slide assembly with two apertured recesses for receiving screen devices, and mechanisms for aligning the recesses alternatingly with a direction of advance of the extruded plastic material. A screen device is replaced within one recess, as a screen device within the other recess filters the extruded plastic material. Such screen device replacement is provided through the automatic, sequential operations of screen device ejection, screen device carrier, screen device introducing and screen device reloading mechanisms.

Abstract: A vented injection molding machine adapted to handle a wide variety of synthetic resinous materials without predrying is disclosed. The molding machine includes a two-stage screw rotatably and reciprocably mounted within a barrel. The barrel includes a pair of ends, a feed opening at one end and a vent opening intermediate the pair of ends. A first stage of the screw essentially completes material plastication. The first stage has a protruding helical screw flight with a first pitch and includes a feed section communicating with the feed opening, a transition section, and a pumping section. A second stage of the screw includes a deep flighted vent section which communicates with the vent opening and the first stage pumping section, a short transition section and a relatively short second pumping section. The second stage also includes a protruding helical screw flight having a second pitch which is greater than the first pitch of the first stage.

Abstract: A housing has a threaded bore opening to an inlet and an outlet. The outlet axis is substantially perpendicular to the bore axis while the inlet axis is off-center from the bore axis. A plug in the housing bore comprises three cylindrical portions which are threaded in the housing bore and which are joined together but spaced apart by perforate cylindrical support tubes of lesser diameter than the threaded portions. A screen mesh extends about each support tube. Bores extend radially through two of the threaded cylindrical portions and only one at a time is alignable with the housing outlet, depending upon the threaded position of the plug in the housing bore. Accordingly, molten plastic material enters into the bore from the off-center housing inlet which urges the plastic material around the exterior of the screen to limit clogging and to extend screening life.

Abstract: The charge forming barrel has a screw slidably and rotatably received therein, and the screw is specially suited for successively forming a mottle charge, a valve stud being mounted on the forward end of the screw, and this stud cooperating with a ring shaped non-return valve to close off rearward flow of the plasticized ingredients comprising the charge. The valve closes in a sliding or shearing action which avoids the propensity for such pellets to prevent the full closure of the non-return valve during the period of the cycle where a charge is injected into the mold cavities, and prior to forming of the next succeeding charge.

Abstract: A kneading and extruding apparatus for extrudable material such as soap material and its additives, comprising a perforated rotating disc at an output end of a kneading screw shaft, a perforated stationary disc adjacent to the rotating disc to form a clearance therebetween, a punching plate fixed to the stationary disc confronting the rotating disc and formed with a great number of small holes having a diameter smaller than those of the holes of the rotating and stationary discs, and a blade-like cutter for serving the material extruded through the holes of the stationary disc. The material is sheared in the clearance between the rotating disc and the punching plate to blend the material and the additives effectively.