Within Pressurizing Chamber Patents (Class 425/207)
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Patent number: 4373892Abstract: Apparatus for preparing bread dough comprises a hopper for bulk dough, a rotary pump communicating with the hopper, a die through which dough is extruded by the pump in a continuous ribbon, conveyor means for receiving and conducting the ribbon of dough in succession through proofing means, guide rolls, means for cutting the ribbon of dough into individual pieces, means to roll the individual pieces into cylindrical shapes, and means to divide the cylindrical shapes into at least two further pieces. High production is achieved with a minimum of labor, and excessive working and kneading of the dough are avoided.Type: GrantFiled: January 11, 1982Date of Patent: February 15, 1983Inventor: Joseph Nordmann
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Patent number: 4290701Abstract: A plasticizing screw of an injection-molding machine, axially movable in an extruder barrel, is driven by a tubular input shaft via a splined quill partly retractable into the shaft with which the quill is coupled through an internally and externally splined bushing. Another such bushing is removably seated, for possible replacement by a similar bushing of different inner diameter, in an internally splined cup-shaped head of the quill and engages the splined rear end of the screw. The quill head rests via a thrust bearing against the front end of a nonrotatable tubular piston coaxially surrounding the quill and entering by its rear end an annular cylinder which is hydraulically connected with a pressure accumulator including a gas cushion. The accumulator creates a back pressure by which molding material, plasticized by the screw during the preceding phase in which the screw was repressed into a rear position, is introduced via a check valve into a shooting pot alongside the extruder barrel.Type: GrantFiled: July 6, 1979Date of Patent: September 22, 1981Assignee: Husky Injection Molding Systems Inc.Inventor: Robert D. Schad
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Patent number: 4249877Abstract: An extruder for thermoplastics having a directly motor-driven high-speed feed screw which mechanically force-feeds raw plastic pellets, pushing them forward under high pressure into a heat-transfer zone for melting, and finally through a static mixer, to deliver a pressurized homogeneous melt to an extrusion die. Melt pressurization results entirely from the mechanical force-feeding action of the screw rather than through the viscous shear action found in conventional screw extruders.Type: GrantFiled: March 26, 1979Date of Patent: February 10, 1981Inventor: James F. Machen
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Patent number: 4247501Abstract: Methods and apparatus for marbleizing molded parts produced by screw extruder machines. Liquid colorant is advantageously injected at a comparatively high pressure into a melt containing portion of the machine between the screw and its housing, where the melt is either completely molten or more than fifty percent molten.Type: GrantFiled: November 6, 1978Date of Patent: January 27, 1981Assignee: Gillette CompanyInventors: Wiley L. Easley, Richard J. Hoeske, Silvio Petrucci
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Patent number: 4246224Abstract: A process for the production of compact, shaped articles from vulcanizable rubber mixtures in powder form by means of a screw plasticizing unit, wherein the powder-form rubber mixture is first introduced through a delivery-active feed pocket into the extruder, subsequently plasticized in a mixing zone, compacted by combining the plasticized rubber particles and subsequently shaped in plasticized and homogenized form, and an apparatus for carrying out the above process.Type: GrantFiled: August 21, 1978Date of Patent: January 20, 1981Assignee: Bayer AktiengesellschaftInventors: Josef P. Lehnen, Gerd Zingelmann
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Patent number: 4243629Abstract: The heating of the powder of rigid polyvinyl chloride in an extrusion machine of known type presents difficulties and causes burning. According to the invention this is avoided by introducing continuously the raw material in the form of powder after intense mixing with stabilizer and plasticizer in the feed opening of a monoscrew extruder. The said monoscrew extruder has eight different zones: an introduction zone preferably without heating; a slightly heated compression zone; a heated homogenization zone (H); a plasticizing zone; a heated decompression zone (D); a heated degasifying zone (G); a heated compression zone (K.sub.2) and a heated expulsion zone.For the plasticizing there is inserted in the extrusion screw before the decompression zone (D) a ring (3) provided with calibrated bores (4 and 5) which obstruct, that is, delay the flow so as to plasticize it without having to increase the temperature.Type: GrantFiled: March 13, 1979Date of Patent: January 6, 1981Assignee: P.W.T. Plastic World Technology LimitedInventor: Gicancarlo Tramezzani
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Patent number: 4242944Abstract: An improved plastics moulding machine comprises an oil cylinder, an injection ram in said oil cylinder adapted to move forward and backward by the actuation of the hydraulic system, and a shafting consisting of a main driving shaft, a transmission shaft and a screw rod; wherein a fixed protection sleeve is provided between the main driving shaft and the injection ram for preventing the friction therebetween.Type: GrantFiled: October 27, 1978Date of Patent: January 6, 1981Inventor: Jui-Lieh Su
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Patent number: 4213710Abstract: An extruder machine for processing thermoplastic materials such as low density polyethylene, the extruder incorporating a body having a bore therethrough with a rotor or screw journalled therein. The rotor has several successive mixing and pumping sections. The mixing sections on the rotor are multiple flighted defining primary and secondary channels having their discharge and entrances respectively blocked or restricted by annular dam arrangements. The rotor includes a plurality of adjustable dams, arranged across the channels, permitting a variation in the degree of homogenization which may be performed upon the extrudite. The dams may be radially displaceable to vary the distance between the radially outer surface of the dam and the surface of the bore.Type: GrantFiled: September 26, 1978Date of Patent: July 22, 1980Assignee: USM CorporationInventors: Peter Hold, Zehev Tadmor, Hans R. Scharer
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Patent number: 4202658Abstract: A glide-casting machine for the manufacturing of hollow concrete elements. The machine is movable in relation to a casting base and comprises means for feeding concrete mix onto a number of screw feeders with vibrator sleeves constituting extension of each screw feeder. In addition, the machine comprises external vibrating means. In connection with each screw feeder there are provided on one hand, two guide plates parallel to the axis of the screw feeder, which guide plates follow the shape of the screw feeders in the bottom portion of the screw feeders. Between the guide plates there is an elongated space parallel to the axis of the screw feeder so as to allow concrete mix to fall straight onto the base on a substantial portion of the length of the screw feeder. On the other hand there are provided flow plates which follow the shape of the outermost screw feeders from above and from the sides.Type: GrantFiled: July 13, 1978Date of Patent: May 13, 1980Assignee: Paraisten Kalkki Oy-Pargas Kalk ABInventor: Esko M. Ahonen
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Patent number: 4194842Abstract: Liquid-containing radioactive wastes are bound into thermoplastic material by introducing particles of thermoplastic material at a non-sticking temperature into a kneading machine, heating the thermoplastic material in the absence of radioactive wastes to at least 100.degree. C., adding the liquid-containing wastes to the heated thermoplastic material, mixing and concurrently increasing the temperature of the mixture to a temperature of about 200.degree. C. or more to vaporize liquid in the mixture, maintaining the mixture at a vaporization temperature to dry to the mixture, releasing evolved vapors and discharging the dried mixture from the kneading machine. Difficulties due to clogging of the kneading machine and fluctuations in the consistency of the dried end product are minimized.Type: GrantFiled: July 7, 1977Date of Patent: March 25, 1980Assignee: Kraftwerk Union AktiengesellschaftInventor: Anwer Puthawala
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Patent number: 4192617Abstract: A screw extruder for processing rubber or plastics material, comprising a cylinder jacket with a feed hopper, a central geared shaft and geared planet shafts disposed between the central shaft and the cylinder jacket and drivably engaged with the central shaft and the cylinder jacket, wherein parts of at least some of the planet shafts are bare of gearing.Advantageously each alternate planet shaft is only partly geared, the gearing extending for only approximately half the length of the shaft, at one end or the other end or in two quarter length portions at the opposite ends. Alternatively each third planet shaft is only partly geared.Preferably each geared part of a planet shaft which is only partly geared overlaps with a geared part of the planet shaft which follows it in the direction of rotation.Type: GrantFiled: April 20, 1978Date of Patent: March 11, 1980Assignee: Hermann Berstorff Maschinenbau GmbHInventor: Horst Spielhoff
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Patent number: 4185951Abstract: A process for the extrusion of patterned sheets of thermoplastic synthetic resins wherein a transparent basic synthetic resin material is combined with at least one differently colored secondary synthetic resin material, and wherein the combined stream of material made up of the basic material and the secondary material flows, during the extrusion, at least in partial zones at right angles to the extrusion flow direction, based on the flow cross section, is disclosed.Type: GrantFiled: May 10, 1977Date of Patent: January 29, 1980Assignee: Dynamit Nobel AGInventors: Kurt Webermeier, Waldemar Wissinger, Otto Rulle
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Patent number: 4176967Abstract: Apparatus for the preparation and extrusion of plastics material or rubber, comprising a planet rolling extruder and a feed portion disposed upstream thereof with a main shaft of the planet rolling extruder being surrounded by planet shafts and being driven jointly with a feed-screw of the feed portion, in which some of the planet shafts at their ends adjacent the feed-screw are reduced in section to form transfer shaft portions and thereby receiving chambers for material fed to the planet rolling extruder by the feed portion. The transfer shaft portions may be cylindrical with a diameter smaller than the diameter of the root circle of the planet shaft gearing or may have, adjacent the feed-screw, a diameter smaller than the root circle of the planet shaft gearing and increase in diameter in a direction away from the feed-screw until they achieve the full shaft outline.Type: GrantFiled: June 8, 1978Date of Patent: December 4, 1979Assignee: Hermann Berstorff Maschinenbau GmbHInventors: Heinz Brinkmann, Horst Spielhoff
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Patent number: 4152076Abstract: 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.Type: GrantFiled: March 14, 1977Date of Patent: May 1, 1979Assignee: General Electric CompanyInventor: Roger D. Driskill
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Patent number: 4106113Abstract: A feeding screw assembly of a molding machine for plasticizable masses, particularly, plastics and rubber, comprises a passage part of the screw which has a passage therethrough having mixing means therein for intermixing a plasticizable material which passes through the passage. The material is diverted into the mixing passage which extends completely through the length of the mixing part by communicating passages located upstream for the inflow of the material and downstream for the discharge of the material after it is mixed. The construction may also include a passage portion which comprises an annular displaceable part having an end or side bounding a communicating passage upstream and which will move in a direction to close off this passage after a part of the other material has been fed into the mixing passage.Type: GrantFiled: November 4, 1976Date of Patent: August 8, 1978Assignee: Netstal-Maschinen AGInventors: Friedrich Laimer, Bernhard Roth
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Patent number: 4082488Abstract: The invention relates to an apparatus for the extrusion of temperature sensitive thermoplastics to form structural rib-free semi-finished products in contra-rotating driven screws.Type: GrantFiled: November 29, 1976Date of Patent: April 4, 1978Assignee: Bayer AktiengesellschaftInventors: Franz-Jurgen Brinkschroder, Axel Sandquist, Friedrich Johannaber
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Patent number: 4077756Abstract: Mixer apparatus for use with injection molding, extrusion or mixing and compounding machines wherein a melt chamber is lined with a series of stacked Belleville spring washers to provide a series of axially narrow, annular extrusion passages between the washers. A quantity of thermoplastic material is supplied to the melt chamber at the inner diameter of the washers and is therein subjected to pressure to cause extrusion of the material through the passages. From the washers, the material is directed through axially extending slots about the washers to a mold cavity or forming die.Type: GrantFiled: September 8, 1976Date of Patent: March 7, 1978Assignee: Peerless Machine & Tool CorporationInventor: William R. Meadors
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Patent number: 4059374Abstract: The proposed device for producing polymer articles from monomers is characterized in that the means for preparing the polymer melt is made in the form of at least one chamber of elastic material, the height of which is several times less than its width and length. Said chamber is placed inside a heated housing filled with a medium intended to exert the required pressure on the chamber walls.Type: GrantFiled: December 16, 1976Date of Patent: November 22, 1977Inventors: Nikolai Alexandrovich Mikhalev, Boris Petrovich Shtarkman, Jury Ivanovich Gladyshev
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Patent number: 4057379Abstract: 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.Type: GrantFiled: October 29, 1974Date of Patent: November 8, 1977Assignee: Sato Iron Works Co., Ltd.Inventor: Takuya Sato
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Patent number: 4022556Abstract: A machine is provided for forming hollow cored concrete slabs in which the hollow core may be produced with shapes other than circular in cross section. The machine may produce a noncircular cross sectioned core by utilizing a novel auger assembly construction which employs an open spiral auger, in the form of a corkscrew, which is supported by an initial core forming member which constitutes a surface of revolution and which conforms substantially to the internal surface of the spiral auger member so as to permit the auger to move over the surface thereof and thus continuously wipe clean the surface and prevent any build up on the initial core forming member. The rotating auger is utilized to compress and form concrete material firstly over the initial core forming member and secondly over the final trowel member, in a manner such that the final slab product will have a core with a cross sectional shape approximating that of the final trowel member.Type: GrantFiled: April 30, 1975Date of Patent: May 10, 1977Assignee: The George Hyman Construction CompanyInventor: Ted G. Goetjen
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Patent number: 4013391Abstract: An apparatus for mixing and molding a chemically foamable reaction mixture is comprised of a mold with a mixing chamber which has its outlet aperture in a wall of the mold and a displacement piston mounted in the opposite wall. An ejector piston is displaceable within the mix chamber and may be so channelled as to serve as a control piston. This ejector piston is displaceable from a position wherein the injection apertures lie between it and the mold cavity to a position wherein its end surface is flush with the mold wall. The displacement piston is so mounted that it may extend across the mold cavity and intrude into the outlet aperture of the mixing chamber. This displacement piston has a diameter smaller than the diameter of those portions of the mixing chamber into which it protrudes so that when this piston is within the mixing chamber an annular cavity is formed between it and the side walls of the mixing chamber. It is withdrawable to a position flush with the mold wall it protrudes through.Type: GrantFiled: March 14, 1975Date of Patent: March 22, 1977Assignee: Bayer AktiengesellschaftInventors: Heinrich Boden, Ulrich Knipp
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Patent number: 3989434Abstract: Mixing means in the form of a torpedo for an injection molding machine having a plurality of alternately isolated and intersecting flow paths for repeatedly dividing and recombining material flow streams to achieve uniform properties throughout the material. The paths are formed as right and left-hand helical channels on the circumference of the torpedo body, with the helixes of one hand having a pitch different from that of the other such that the flow paths intersect in a pattern which is bilaterally asymmetrical with respect to an axial net flow direction. The nonsymmetrical arrangement is formed to provide substantially greater mixing action than that obtainable with similar symmetrical arrangements.Type: GrantFiled: October 29, 1975Date of Patent: November 2, 1976Assignee: McDowell-Wellman Engineering CompanyInventor: James R. Mercer
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Patent number: 3975128Abstract: A housing is formed with a quieting chamber which opens in one direction into a mold and with a mixing chamber opening in another direction at right angles to the first-mentioned direction into the quieting chamber. A pair of reactive components are introduced into the mixing chamber to form a mixture therein. Thereupon a mixing piston or plunger is shifted along this mixing chamber at right angles to the quieting chamber so as to force the mixture out of the mixing chamber and into the quiescence chamber. This piston at the end of its stroke lies with is end face flush and contiguous with a planar inner surface of the quieting chamber. Thereupon a displacement piston or plunger moves the full length of the quieting chamber so as to press the mixture from this chamber into the mold. The quieting chamber has the cross-sectional shape of a circular segment and the mixing chamber is of uniform circular cross-section.Type: GrantFiled: May 28, 1974Date of Patent: August 17, 1976Assignee: Krauss-Maffei AktiengesellschaftInventor: Klaus Schluter
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Patent number: 3966177Abstract: This invention is addressed to a new and improved feeding device for feeding plastic materials, such as thermoplastic materials, to a processing machine including a fixed plate and a rotatable plate having an annular channel therebetween and a feed hopper to supply plastic material to the annular channel in which the feeding device comprises a metering screw to feed plastic material from the feed hopper to the annular channel and a hook-crown including a plurality of deflecting hooks mounted on the rotatable plate in the annular channel whereby the deflecting hooks sweep the volume of the annular channel and deflect the plastic material fed thereto by the metering screw to permit regular and efficient feeding to the processing device.Type: GrantFiled: September 27, 1973Date of Patent: June 29, 1976Assignee: Societe d'Etudes VerrieresInventors: Serge Lagoutte, Andre Lanciaux
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Patent number: 3957210Abstract: An apparatus for the continuous dispersion and fine grinding of substances in a liquid or liquefiable dispersion medium, comprises of a cylindrical vessel, in the grinding chamber of which is disposed a coaxial stirrer shaft, which is adapted to be driven rotationally and is equipped with mixing tools, and a filling of grinding elements, the grinding chamber being immediately preceded by a device for mixing the substances with the dispersion medium.Type: GrantFiled: August 9, 1974Date of Patent: May 18, 1976Assignee: Draiswerke GmbHInventor: Herbert Durr
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Patent number: 3953006Abstract: Elastomeric compositions of discrete parts of curable polymer and a curing agent are converted, by means of a portable, hand held conversion and dispensing apparatus, to a curable mass. The apparatus in a single compact package includes means for (1) receiving the uncured composition or article (2) breaking or fragmenting the composition (3) conveying the fragmented composition to a mixing zone (4) mixing the curable composition and (5) discharging or dispensing the mixed curable material into or on a substrate for in situ curing thereat. Also included is a power source and power transmission means wherein different rotational speeds and directions are obtained between the conveying and mixing means.Type: GrantFiled: August 9, 1974Date of Patent: April 27, 1976Assignee: Thiokol CorporationInventors: Adam J. Patarcity, Daniel J. Smith