Shaping Orifice And Either A Downstream Preform Reshaping Means Or Vulcanizing Means Including Conforming Preform Support Patents (Class 425/325)
  • Patent number: 4708841
    Abstract: A pipe plug apparatus and method for its use are described herein. A pipe plug is provided which includes a first portion, and second and third portions which radially extend from the exterior surface of the first portion so as to surround the first portion. When the plug is positioned in a pipe, liquid is introduced into the space as defined between the second and third portions, and as defined between the pipe interior surface and first portion exterior surface, so as to at least partially fill the space with the liquid.
    Type: Grant
    Filed: October 31, 1985
    Date of Patent: November 24, 1987
    Assignee: Phillips Petroleum Company
    Inventor: Olaf E. Larsen
  • Patent number: 4704244
    Abstract: Thermoplastic articles such as fenders, of large cross-sectional dimensions, may be made by extrusion without shrinkage voids by extruding a first stream of thermoplastic as a hollow profile, and extruding a second stream of molten thermoplastic by a second extruder and forcing same under pressure into the hollow profile to fill the voids of shrinkage on cooling.
    Type: Grant
    Filed: November 9, 1984
    Date of Patent: November 3, 1987
    Assignee: Oy Wilk & Hoglund AB
    Inventor: John T. Back
  • Patent number: 4696779
    Abstract: Apparatus and method for extruding and cooling self-adhering elastomeric materials to obtain substantial uniform consistency. This is accomplished by bisurfacially exposing the material to cooling while supporting the material as a foraminous means.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: September 29, 1987
    Assignee: Kimberly-Clark Corporation
    Inventor: Ronald H. Wideman
  • Patent number: 4685879
    Abstract: The calibrator for plate like extruded products, particularly a wall section composed of a plastic, comprises an upper portion, a lower portion connected to the upper portion and a gap for the extruded material formed between them, the upper and lower portions being pivotally connected on one side by a pivot member. To allow a rapid and easy closing and opening of this calibrator a pivoting member pivotally attached to these portions and positioned for locking of the upper with the lower portion is provided. Further in the calibrator a cooling means through which a cooling medium, for example water, flows is provided. For even more efficient cooling a snake like channel for the cooling medium running transverse to the extrusion direction is provided. Both the above features can be employed independently of each other or used jointly.
    Type: Grant
    Filed: June 13, 1986
    Date of Patent: August 11, 1987
    Inventors: Franz Purstinger, Siegfried Topf
  • Patent number: 4682941
    Abstract: Flattening and take-off apparatus for use with a device for providing a blown tubular film. The apparatus includes a flattening device for flattening the tubular film, and a cutting device for cutting one lateral edge of the flattened film. A pair of pinch rollers is provided and is driven to carry the cut and flattened film to an unfolding device, which is defined by a pair of edges that are inclined relative to the direction of movement of the film web, and over which respective ones of the juxtaposed portions of the cut flattened web are adapted to pass to define a single ply web. The pinch rolls include removable spacing rings to prevent the formation of a fold line on the opposite lateral edge from the cut edge of the flattened film. The unfolding device is movable laterally and parallel to the direction of movement of the film.
    Type: Grant
    Filed: June 10, 1986
    Date of Patent: July 28, 1987
    Assignee: Windmoller & Holscher
    Inventors: Hartmut Upmeier, Rudolf Peters
  • Patent number: 4675199
    Abstract: A process for the production of pasta characterized in that flour is mixed with from 15% to 33% by weight of water based on the weight of flour and water to form a dough, the dough is extruded through a pasta die provided with at least three superimposed nozzles for forming dough sheets, and the extruded, superimposed dough sheets are compressed into one dough sheet which is then cut to form the desired pasta shape.
    Type: Grant
    Filed: May 30, 1985
    Date of Patent: June 23, 1987
    Assignee: Nestec S.A.
    Inventor: Jau Y. Hsu
  • Patent number: 4674969
    Abstract: Apparatus for extruding and reshaping plastic tubes including cooperating circulating molds attached to continuous belts or chains. The molds circuits at generally constant level. A wheeled carriage is provided to support the molds and to permit axial adjustment of the molds relative the extruder nozzle. Means also is provided for vertical adjustment of mold support means.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: June 23, 1987
    Assignee: Frankische Rohrwerke Gebr. Kirchner GmbH & Co.
    Inventor: Gunther Korn
  • Patent number: 4649008
    Abstract: Interlocking vinyl siding panels are formed from vinyl sheets. A sheet of vinyl is extruded with a V-shaped bend along one of its edges, and a Z-shaped bend intermediate its edges. The extruded sheet of vinyl is then formed, while in a hot, semi-viscous state into the final siding profile. As the siding profile is formed, the V-shaped bend is formed into a first locking profile and the Z-shaped bend is formed into a second locking profile. The first locking profile is dimensioned for a snap-type engagement with the second locking profile of another similarly formed siding member.
    Type: Grant
    Filed: February 16, 1984
    Date of Patent: March 10, 1987
    Assignee: Alcan Aluminum Corp.
    Inventors: Thomas O. Johnstone, Thomas W. Dawe
  • Patent number: 4645631
    Abstract: Extrusion of a mixture of vegetable bits with a binder, particularly wood chips with a weather-resistant binder, involves precompressing in a compression chamber of an extrusion press the mixture by a compression stroke transverse to the extrusion axis, the compression stroke being delivered by at least one precompression piston. Prior to the precompression elongated bits of the mixture are acted on by an orienting influence so that the elongated bits are deposited substantially parallel to the extrusion axis. The outer layers of the mixture are compressed with a reduced precompression ratio so that the bits oriented prior to precompression remain fixed in position during the subsequent extrusion stroke.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: February 24, 1987
    Assignee: Anton Heggenstaller
    Inventors: Anton Hegenstaller, Xaver Spies
  • Patent number: 4626187
    Abstract: A synthetic resin plate having at least two different colors is prepared by a process having the steps of supplying at least two polymerizable liquid materials differing in the color from at least two inlets, passing them through at least two groups of flow paths alternately arranged, extruding and injecting the polymerizable liquid materials into a polymerization apparatus, polymerizing the liquid materials, and withdrawing a plate-shaped product having a striped pattern extending from the surface to the interior or a plate-shaped product having said striped pattern in which the boundary area between the adjacent stripe lines of different colors is gradated.
    Type: Grant
    Filed: June 13, 1984
    Date of Patent: December 2, 1986
    Assignee: Mitsubishi Rayon Company Ltd.
    Inventor: Isao Kamada
  • Patent number: 4609509
    Abstract: A process and apparatus for the vulcanization of the insulation of an electric cable in which the cable core with the insulation thereon are passed through a tube filled with a liquid having a specific weight substantially equal to the specific weight of the insulation. The section of the tube nearer the entrance end is supplied with degassed liquid at vulcanizing temperature and the following section is supplied with degassed liquid at a temperature for cooling the insulation, and because the liquid has different viscosities at the two temperatures, a liquid interface is produced between the two portions which interface is maintained during the vulcanizing of the insulation. During the vulcanizing of the insulation, a portion of the liquid in at least one section is removed and treated to remove vulcanization products.
    Type: Grant
    Filed: September 25, 1984
    Date of Patent: September 2, 1986
    Assignee: Societa' Cavi Pirelli S.p.A.
    Inventor: Marcello Sarracino
  • Patent number: 4592274
    Abstract: The machine continuously produces pasta filata cheese by stretching curds while adding hot water then moulding the pasta filata obtained into cheese such as mozzarella, provolone, etc.The curds are sprayed with hot water by nozzles (52, 55) and are pushed by twin augers (53) along a channel (54) into a vertical, substantially cylindrical stretching chamber (68) where a rotating stretching swift (74, 79) having radially projecting, arched paddles (79) stretches the curds into pasta filata against the reaction of a stationary, wall-mounted paddle (78). This spills over a partition (72) onto other augers (57) that feed the pasta filata to moulding means.The moulding means preferably comprise a rotating moulding drum (90) having surface cavities (99), against which pasta filata is pushed through apertures (94) in a distributor block (92). A piston mould (100) mounted on a slide (98) for reciprocating motion between a filling position and a delivery position is also preferably provided as an alternative.
    Type: Grant
    Filed: April 23, 1985
    Date of Patent: June 3, 1986
    Assignee: CMT Costruzioni Meccaniche e Tecnologie S.p.A.
    Inventor: Stefano Tomatis
  • Patent number: 4577998
    Abstract: Process for producing flexible PVC irrigation pipe by extruding a plasticized PVC composition containing a melt strength-enhancing aid and a chemical blowing agent and (a) the extruded melt being expanded by foaming thereof immediately on leaving the die into a substantially closed-cell extrudate of outer diameter greater than the die orifice with the extrudate surfaces being substantially unpunctured, (b) drawing down the extrudate in the atmosphere causing rupturing of the foam cell walls of the extrudate to form a substantially open-cell extrudate having punctured surfaces, and (c) when the extrudate has been drawn down to a degree which is prior to any cellular collapse which would lead to the formation of water-impervious pipe, cooling the extrudate by passing it through a cooling means in order to prevent said collapse. Preferably the extrudate passes through a tubular guide into a water bath in step (c).
    Type: Grant
    Filed: October 4, 1982
    Date of Patent: March 25, 1986
    Assignee: Imperial Chemical Industries, PLC
    Inventor: Clive Dorrn
  • Patent number: 4576773
    Abstract: An extrusion head is disclosed, for extruding weather strips of elastomeric material, particularly for motor vehicles, of the type comprising an anchoring section and a longitudinal sealing section in the form of a tab coextruded with the anchoring section. The extrusion head comprises a die with an extrusion orifice having a shape corresponding to the cross-section of the weather strip to be extruded, and a deflector device adapted, when actuated, to change the inclination or orientation of the sealing section relative to the anchoring section during extrusion.
    Type: Grant
    Filed: February 3, 1984
    Date of Patent: March 18, 1986
    Assignee: S.A.I.A.G. S.p.A.
    Inventors: Roberto Azzola, Luciano Carrera
  • Patent number: 4576769
    Abstract: A method of sizing thermoplastic foamed cigarette filter rods and apparatus therefore. The apparatus comprises a rotating drum member having a plurality of stationary heated block members mounted about the periphery thereof. The block members are positioned such that a specific gap is created through which the thermoplastic polymeric filter rods are rolled and compressed to a uniform circumference.
    Type: Grant
    Filed: March 29, 1984
    Date of Patent: March 18, 1986
    Assignee: Celanese Corporation
    Inventor: Wyatt P. Hargett, Jr.
  • Patent number: 4563320
    Abstract: An extruder delivers an extrudate at a temperature in the low end of the extruding range between 250.degree. and 550.degree. F. between opposed rollers carrying mating dies. The dies are sprayed with mold release agent when away from the extrudate. The extrudate is cooled after leaving the region between a pair of rollers and may enter the region between other similar pairs of rollers. Cold plastic inserts may be inserted into molded items.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: January 7, 1986
    Assignee: Hummor, Inc.
    Inventor: Allan C. Morgan
  • Patent number: 4556382
    Abstract: A die assembly for generating a green tread extrudate for pneumatic tire fabrication is presented. Fundamentally, the invention includes a preform die of fixed configuration, having passages and openings therein for passing both a base stock material and a cap stock material. The openings are separated by a partition. Upper and lower final die plates are then formed to communicate with the openings, one for the cap stock, and the other for the base stock. The configuration of the die portion of the die plates control not only the external geometry of the resulting extrudate, but also the geometry of the junction between the cap stock and the base stock in the extrudate. The invention accommodates a broad range of tire specifications with the simple change of die plates.
    Type: Grant
    Filed: October 11, 1984
    Date of Patent: December 3, 1985
    Assignee: The Firestone Tire & Rubber Company
    Inventors: John F. Nadeau, Jr., Alexander J. Varvaro
  • Patent number: 4555230
    Abstract: In an apparatus such as a corrugator for manufacturing thermoplastic pipe with a corrugated outer wall and a smooth inner wall, a calibrator is employed to provide a smoother inner wall and a more rapid inner wall cooling. The calibrator includes a tube wound into a helical coil and an adjustment mechanism for adjusting the coil diameter. A cooling fluid may be passed through the tube.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: November 26, 1985
    Inventor: Manfred A. A. Lupke
  • Patent number: 4552708
    Abstract: A method for producing a crosslinked, uniformly expanded article of thermoplastic resin is provided.Thermoplastic resin containing a crosslinking agent and a foaming agent is extruded through a long-land die which is provided with a choking orifice at an end and/or an intermediate portion thereof; a lubricant is provided on the inner surface of the long-land die; the crosslinking agent is decomposed in the long-land die to lower the flow rate of the resin and the foaming agent is decomposed or heated to its boiling point in the long-land die to provide an expandable resin and the crosslinked, expandable resin is then released into an atmospheric or controlled pressure zone to produce the uniform, finely expanded article.
    Type: Grant
    Filed: October 14, 1983
    Date of Patent: November 12, 1985
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Takao Kimura, Yoshinobu Nagaoka
  • Patent number: 4548775
    Abstract: A method of producing thermoplastic resin foams is disclosed. The method comprising extruding an expandable resin through a plurality of holes bored in a die in the inside of a frame fitted to the extrusion end surface of the die in an adjacent relation therewith and fusing together the thus-extruded materials while they are expanded and still softened, wherein the inner surfaces of the frame are inclined at an angle of inclination ranging between 5.degree. and 30.degree., so that the cross-sectional area of the frame is increased toward the outer end thereof, and the extruded materials are fused together while kept in contact with the inner surfaces of the frame.
    Type: Grant
    Filed: January 5, 1984
    Date of Patent: October 22, 1985
    Assignee: Sekisui Kaseihin Kogyo Kabushiki Kaisha
    Inventors: Motoshige Hayashi, Toshiro Kobayashi
  • Patent number: 4543051
    Abstract: A vat under vacuum bears in its sidewall a sizing sleeve, the cylindrical downstream portion of which includes annular channels interconnected by distribution channels. Injection ducts leave the bottoms of the annular channels and open out in the inside surface of the sleeve. The interior of the sleeve communicates with the interior of the vat via rows of radial suction ducts. During operation, the injection ducts are supplied with water under pressure which forms a film between the outside of the tubing and the inside surface of the sleeve even when the tubing is pressed against that inside surface owing to the partial vacuum prevailing within the vat.
    Type: Grant
    Filed: December 14, 1982
    Date of Patent: September 24, 1985
    Assignee: Maillefer S.A.
    Inventor: Charles E. Maillefer
  • Patent number: 4534724
    Abstract: A sealing profiled strand of elastomeric materials provided with sealing lips along portions of the strand. The strands emerge from the nozzle or orifice of the extruder, at which point they still have a complete cross section. While still in the plastic state, the strands are cut by a transversely movable cutting knife which is curved in conformity to the outer contour of the strand. The strand is cut pursuant to a prescribed pattern in such a way as to remove portions of the sealing lip.
    Type: Grant
    Filed: July 1, 1983
    Date of Patent: August 13, 1985
    Assignee: Continental Gummi-Werke Aktiengesellschaft
    Inventors: Rolf Fischer, Dietmar Hermann
  • Patent number: 4530650
    Abstract: An apparatus for sizing extruded plastics sections is proposed in which, in order to increase the heat transfer capacity between the hot plastics mass of the section and a cooling vehicle in a reduced space and to allow high production rates, there is interposed between metal block-type sizing gauges a cooling tank to be traversed by the section to be cooled between one sizing gauge portion and a subsequent sizing gauge portion. In this tank, which can also be placed under vacuum, the section is subjected to the action of a cooling fluid such as water or air which acts directly on its outer walls.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: July 23, 1985
    Assignee: Milani Resine S.p.A.
    Inventor: Francesco Milani
  • Patent number: 4509911
    Abstract: A plurality of internal couplers (A, B, C, D) are integrally connected end to end in a single tubing construction of indeterminant length. Between each coupler is an annular, frangible region (14, 24) of thin plastic. In the field, the individual couplers are readily broken manually from the tubing construction. Each coupler includes a plurality of cleats (40) which are partially surrounded by a region (50) of relatively thin plastic material. The couplers are manufactured by continuously blow molding a sleeve of softened plastic into the tubing construction of indeterminent length.
    Type: Grant
    Filed: July 11, 1983
    Date of Patent: April 9, 1985
    Assignee: Hancor, Inc.
    Inventor: Larry A. Rosenbaum
  • Patent number: 4492548
    Abstract: A headpiece for a collapsible tube is a unitary member made up of two different plastics, each plastic providing a different property for the headpiece. The headpiece is formed by extruding on top of one another a first torus like annulus of a first plastic and a second torus like annulus of a second plastic. The two plastic annuli are simultaneously molded to form the headpiece. One plastic forms, primarily, the outer portion of the headpiece and the other plastic forms, primarily, the inner portion of the headpiece.The machine for molding the plastic head includes a work table rotatably indexed from station to station at which various operations are performed. The mandrel which holds the cylindrical body, to which the head is molded, is movable from an inboard position to an outboard position so that operations can be performed relative to it. The molding operation is performed at the inboard position. The loading, extruding, capping and ejection operations are performed at the outboard position.
    Type: Grant
    Filed: December 1, 1981
    Date of Patent: January 8, 1985
    Assignee: RJR Archer, Inc.
    Inventor: Warren N. Hubert
  • Patent number: 4465649
    Abstract: A process and system for the formation of a polymer foam sheet of comparatively uniform biaxially orientation and comparatively uniform dimensions prepared by extruding polymer foam so that it rides on a fluid bearing film between the point of extrusion and a point of diameter expansion of the extruding tube.
    Type: Grant
    Filed: December 20, 1982
    Date of Patent: August 14, 1984
    Assignee: Mobil Oil Corporation
    Inventor: David E. Johnson
  • Patent number: 4456571
    Abstract: A method and apparatus for producing a foamed polymeric sheet having comparatively high density skin layers. Molten polymer containing a foaming agent is extruded from a die into a post-extrusion region defined by the die and a spaced pair of rotating chill rolls which are spaced from the die. The post-extrusion region is maintained at a pressure sufficient to at least inhibit expansion of the foamable molten polymer through the use of cooled sealing elements which occupy a substantial portion of the space between the die and the chill rolls, and are spaced from the chill rolls. The rolls and the sealing elements are cooled so that foamable molten polymer in the space between the sealing elements and the rolls becomes solidified, completing the seal. The chill rolls are maintained at a temperature below the temperature of the molten polymer to aid the skin formation on the surfaces of the polymer. If desired, the polymer can pass directly from the chill rolls into a water bath.
    Type: Grant
    Filed: December 13, 1982
    Date of Patent: June 26, 1984
    Assignee: Mobil Oil Corporation
    Inventor: David E. Johnson
  • Patent number: 4452752
    Abstract: A method and apparatus for continuously cooling a thermoplastic shape having two open sides in which the thermoplastic shape, in its at least partially molten state, is extruded and/or drawn along an elongated form having a contour complimentary to the contour of one side of the two open sides and, simultaneously with moving the thermoplastic shape, at least partially cooling the thermoplastic shape by cooling the form with a liquid cooling medium and drawing a vacuum, on the previously mentioned one side of the two open sides of the thermoplastic shape, through the form.
    Type: Grant
    Filed: January 13, 1982
    Date of Patent: June 5, 1984
    Assignee: Phillips Petroleum Company
    Inventors: Joseph R. Harder, James E. Keesling
  • Patent number: 4449910
    Abstract: Apparatus for making profiled plastic tube and comprising two circulating endless chains, each making a plurality of mold halves move along with a tube coming from an extruder, these mold halves pairwise constituting a mold cavity in which the tube is being given its profile. According to the invention the molds are movable relative to the chain links in a direction perpendicular to the direction of movement of the links. The machine frame is provided with guides for the mold halves, some located interiorly, others exteriorly, with respect to the chain loop, such that once closed, the cavity formed by the pairs of mold halves will remain closed and undisturbed up to the end.Preferably the transitions between curved portions and the operative portion of the path of the mold halves at the entrance and the exit ends are bending points of mathematically calculated paths and the operative straight path tangentially joins said transitional portions.
    Type: Grant
    Filed: June 8, 1982
    Date of Patent: May 22, 1984
    Assignee: Wavin B.V.
    Inventor: Arnoldus W. J. Leloux
  • Patent number: 4447199
    Abstract: Biaxially oriented tubular articles which are destined to provide bodies for processable food containers are made from an elongate tube of thermoplastics material as it emerges from an extruder.
    Type: Grant
    Filed: November 17, 1981
    Date of Patent: May 8, 1984
    Assignee: Metal Box Limited
    Inventors: Leonard W. Reed, Robert M. S. Barr, David A. Dick
  • Patent number: 4416607
    Abstract: An apparatus for continuously extruding, biaxially orienting and intermittently forming molded products from a web of thermoplastic material and further, continuously separating the products from the web selvage, stacking and handling the products and recycling the web selvage for further extrusion. The apparatus uses intermittent molding and biaxial orientation devices into which configuration the continuously extruded web is interfaced by continuous-to-intermittent interfacing loop arrangement which preserves the dimensional and orientational integrity of the web and maintains sufficient thermal stability therein to provide molded products which are free from defects such as stretch marks and other inertial and thermal discontinuities normally anticipated in cases of intermittent web advance of thermoplastic material at thermoformalbe temperature levels.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: November 22, 1983
    Assignee: Maryland Cup Corporation
    Inventor: Thomas W. Winstead
  • Patent number: 4409173
    Abstract: Crystalline polystyrene is thermoformed by extruding molten material into a temperature controlled roller press having press rollers and draw rollers separated by a support roller. The buildup of sheet between the support and draw roller is controlled. The edges of the sheet are heated and then gripped by a first set of sprockets and a second set positioned past the thermoforming device. The gripped sheet passes through a heating device where both sides of the sheet are heated before the intermittent action of the press.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: October 11, 1983
    Assignee: O.M.V. SpA
    Inventor: Pietro Padovani
  • Patent number: 4402658
    Abstract: A die assembly for the extrusion of thermoplastic pipe from a plastic exhibiting an appreciable amount of memory and thus having an elongated heated portion defined by an elongated outer bushing ring with an inside diameter substantially equal to the nominal outside diameter of the pipe to be produced and an inner mandrel ring having an outside diameter smaller than the inside diameter of the bushing ring and disposed within the bushing ring to form an annular extrusion channel, the essentially straight portion of the extrusion channel defining the land length of the die and the width of the extrusion channel defining the die opening of the die, the improvement comprising a mandrel formed in two sections, including a longer upstream section, fixedly mounted in the die and having a fixed mandrel outside diameter and a downstream mandrel section removably mounted in the die as an extension of the upstream section and replaceable by downstream mandrel sections of equal length but different mandrel outside diamet
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: September 6, 1983
    Assignee: Phillips Petroleum Company
    Inventor: Olaf E. Larsen
  • Patent number: 4399085
    Abstract: A process of producing a fibre-reinforced shaped article comprising extruding a composition comprising a settable fluid as a carrier for fibres at least 5 mm in length through a die so that relaxation of the fibres causes the extrudate to expand to form an open fibrous structure with randomly dispersed fibres as the extrudate leaves the die characterized in that the porous extrudate is compressed while the carrier is in a fluid condition into a shaped article. The process enables moulded articles to be formed having a random distribution of fibres the majority of which are at least 5 mm long.
    Type: Grant
    Filed: January 20, 1982
    Date of Patent: August 16, 1983
    Assignee: Imperial Chemical Industries PLC
    Inventors: Geoffrey R. Belbin, Frederic N. Cogswell
  • Patent number: 4398881
    Abstract: This invention relates to an apparatus for forming soft and sticky food material such as kneaded mixture of water and rice flour, wheat flour, etc., into globular shape in formation chambers in the form of pipe. Four crossing members constitute one group and create a formation chamber in the form of pipe. The crossing members on one side of the formation chambers are made to reciprocate in the opposite directions to those on the other side thereof, while touching, whereby the material is kneaded into globular shape,.
    Type: Grant
    Filed: May 12, 1982
    Date of Patent: August 16, 1983
    Inventor: Masao Kobayashi
  • Patent number: 4399086
    Abstract: The invention relates to a process for the continuous manufacture of foamed sheets of thermoplastic material having an extreme width to thickness ratio, small thickness tolerance, a uniform cell structure and, over the whole cross section on both sides of the sheet a thin, non-foamed outer skin. The plastic, which already contains the foaming agent is, on emerging from a wide-slit nozzle, allowed to foam freely without any restriction and cool. The sheet or strip formed in this manner is then heated locally at the surface and calibrated to final dimension.
    Type: Grant
    Filed: February 20, 1981
    Date of Patent: August 16, 1983
    Assignee: Swiss Aluminium Ltd.
    Inventor: Juris Walter
  • Patent number: 4395214
    Abstract: An apparatus is provided for forming, shaping and surface finishing a foam extrudate as it expands and passes from an extrusion die to obtain, in particular, foam or cellular bodies having a substantial thickness in relation to their width. The apparatus comprises opposed extrudate shaping members located on opposite sides of the die orifice of the extrusion die and extending immediately downstream therefrom. The upstream end of each shaping member is hingedly supported adjacent and preferably slightly upstream from the die orifice, and the hinged supports at the upstream ends of the shaping members are uniformly adjustable towards and away from the central transversely extending plane of the extrusion die. The downstream end of each shaping member is hinged to a respective conveyor or surface finishing member of a conveyor or surface finishing assembly.
    Type: Grant
    Filed: August 27, 1981
    Date of Patent: July 26, 1983
    Assignee: U.C. Industries
    Inventors: Arthur L. Phipps, Ben Stoyanov
  • Patent number: 4393016
    Abstract: In a process for producing a plate-like polystyrene resin foam which comprises extruding a molten mixture consisting of a polystyrene resin and a volatile blowing agent by an extruder into a zone having a lower pressure than the inside of the extruder; the improvement wherein said volatile blowing agent is a mixture consisting of dichlorodifluoromethane, ethyl chloride and methyl chloride in which dichlorodifluoromethane accounts for 50 to 70% by weight of the mixture and the remainder consists of ethyl chloride and methyl chloride and the amount of ethyl chloride is at least 30% by weight based on the total amount of ethyl chloride and methyl chloride; and wherein said volatile blowing agent is present in said molten mixture in a proportion of 8 to 17 parts by weight per 100 parts by weight of the polystyrene resin component.
    Type: Grant
    Filed: August 28, 1981
    Date of Patent: July 12, 1983
    Assignee: Japan Styrene Paper Corporation
    Inventors: Hiroyuki Akiyama, Hideo Hatakeyama, Nobuyoshi Shimoyashiki, Yoshiaki Momose, Fusao Imai
  • Patent number: 4392801
    Abstract: In apparatus for manufacturing an elongated cheese product, the extrusion of a heated mass of cheese is followed by a subsequent pulling or tensing of the extruded strand which develops a fibrous texture in the product and reduces the size of the strand. The pulling is carried out on a continuous basis by a tension applying device, downstream of the extruder, which may comprise a pair of drums around which the cheese strand is wrapped. The strand then passes down a cooling vat under tension from a second tension applying device which retains the properties of the strand as it cools. The second tension applying means may include pairs of driven rollers through which the cheese strand passes. After the pulling and cooling, the strand is cut in lengths suitable for packaging.
    Type: Grant
    Filed: March 19, 1981
    Date of Patent: July 12, 1983
    Inventor: Matthew Meyer
  • Patent number: 4371488
    Abstract: An improved method and apparatus using edge shaping and traction rolls is disclosed for shaping and forming plastic foams as a foamable extrudate is extruded through an arcuate orifice of an extrusion die. Immediately adjacent and downstream of the die orifice are opposed sets of curved rolls, each having substantially the same center of curvature as the die orifice and being positioned, respectively, on opposite sides of the extrudate pass line. Moreover, two pairs of traction shaping rolls downstream of the curved rolls engage edge portions of the extrudate further to assist in shaping the same especially in connection with the shaping and forming of relatively wide bodies of plastic foam material. Several parameters of the traction rolls may be adjusted to selected values affecting the force and direction applied by such rolls to the extrudate.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: February 1, 1983
    Assignee: U.C. Industries
    Inventors: Arthur L. Phipps, Ben Stoyanov
  • Patent number: 4364882
    Abstract: The invention relates to a process and an apparatus for manufacturing plastic pipes having a composite structure by extrusion.The material forming the inner and outer walls of the tube is introduced into a special heated and regulated distribution head and is separated into two distinct streams between which a filling material forming a first stream is injected. These three streams are brought together and placed in contact, thus forming a blank which is given its final dimensions by being passed into a conventional tool comprising a trefoil, die and mandrel, followed by a conformator.Application to the manufacture of large dimension tubes for the disposal and drainage of sewage and rainwater.
    Type: Grant
    Filed: May 8, 1980
    Date of Patent: December 21, 1982
    Assignee: Societe Generale de Canalisations Sogecan
    Inventor: Marcel Doucet
  • Patent number: 4361530
    Abstract: An extruder has a nozzle from which it extrudes a strand formed of a mixture of wood chips and a synthetic-resin binder into a passage formed by a plurality of transversely and longitudinally movable walls. Opposite walls are urged transversely inwardly by respective hydraulic cylinders to compact and densify the strand as it cures, and other cylinders urge the walls upstream toward the nozzle with a force slightly smaller than the extrusion force. Thus as the extrusion force exceeds the opposite longitudinal biasing force the walls will move downstream with the strand, to return upstream between advance steps of the strand.
    Type: Grant
    Filed: May 6, 1981
    Date of Patent: November 30, 1982
    Assignee: Anton Heggenstaller
    Inventor: Gunter Peer
  • Patent number: 4359439
    Abstract: The invention concerns the production of an extruded plastic sectional bar, or the like profiled element, having one longitudinally extending section which has a duller surface finish and another longitudinally extending section which has a less dull surface. To accomplish this, the extrusion tool, at the outlet end, has first and second temperature control devices so that as the bar is being extruded, the first section of the bar is exposed to one temperature while the second section of the bar is exposed to a different temperature, for producing the different surface finishes.
    Type: Grant
    Filed: June 8, 1981
    Date of Patent: November 16, 1982
    Assignee: Gebr. Happich GmbH
    Inventors: Gunter Fritsch, Heinz Vollmer, Walter Schmitz
  • Patent number: 4358418
    Abstract: A method of and apparatus for the cold extrusion of a mixture of plant particles and a binder, especially for the production of load-bearing beams and similar shaped bodies in which the plant particles are wood chips or the like, utilizes a plunger, ram or piston for displacement of the mixture into the extrusion passages (in which hardening can occur) under conditions such that the material flows during compaction and is compressed with a densification ratio of 2:1 to 4:1 (preferably 3:1), a plunger stroke of 400 to 800 mm (preferably 600 mm) and a velocity of the plunger between 0.04 and 1.5 meters per second (preferably 0.06 meters per second).
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: November 9, 1982
    Inventor: Anton Heggenstaller
  • Patent number: 4354814
    Abstract: In an extruder with a wide extrusion head and an associated calender, the wide extrusion head defining a sheet extrusion die 16 has an upper extrusion head, part 12 and a lower extrusion head part, which parts can be moved away from one another. At least one clamping device is provided which releasably presses the upper extrusion head part and the lower extrusion head part together and which is mounted in an associated side wall of the calender and is provided with a hydraulically operable piston cylinder drive. In order to achieve optimum clamping of the upper extrusion head part 12 and the lower extrusion head part, each clamping device has a tie rod which, on its one side bears against the lower extrusion head part or the upper extrusion part by means of a fixed abutment, e.g. a nut, or by means of an axially variable abutment e.g. a thrust box 51, which can be driven by a drive nut, the clamping device being mounted on the side wall to be freely movable in the upward and horizontal directions.
    Type: Grant
    Filed: August 5, 1980
    Date of Patent: October 19, 1982
    Assignee: Werner and Pfleiderer
    Inventors: Albert Grimminger, Heinz Koch
  • Patent number: 4352771
    Abstract: A method for creating random shadow patterns in formed vinyl sheet to be used as siding material for buildings. The method includes the step of extruding a flat, hot web of vinyl material having a predetermined thickness and a predetermined distance between the edges thereof, then embossing a graining pattern on one face of the web, cooling the web after it has been embossed and then gathering the web toward the center thereof whereby to reduce the distance between the edges thereof, the web then being preformed, by folding the same along longitudinally extending lines. The sheet is finally formed while restraining the edges of the web whereby to create peaks and valleys cross-sectionally of the web to thereby present the random shadow pattern which is found attractive in finished vinyl siding.
    Type: Grant
    Filed: April 16, 1981
    Date of Patent: October 5, 1982
    Assignee: Variform Plastics, Inc.
    Inventor: Robert J. Szabo
  • Patent number: 4340343
    Abstract: A food preparation machine primarily designed for the production of the Italian potato based delicacy gnocchi and characterized by an inclined flouring ramp, a motor driven roller located under the lower end of the ramp, a deflection plate located proximate the roller, and a dough extruder for depositing dough plugs near the top of the ramp so that they roll and slide down the ramp into abutment with the deflection plate and the roller. As the roller is rotated the dough plugs are squeezed through a gap between the roller and the lower edge of the deflection plate to take on the characteristic form of gnocchi. A flouring mechanism is provided to flour the parts of the machine that come into contact with the dough, including the ramp and a rotating knife blade which cuts the extruded dough into the plugs. The roller is threaded from both ends with opposing threads so that the plugs are urged towards the center of the roller as it is rotated.
    Type: Grant
    Filed: August 10, 1981
    Date of Patent: July 20, 1982
    Inventor: Ugo Mancini
  • Patent number: 4334845
    Abstract: A machine assembly for producing lengthy rolls of bakery products such as biscuits and the like, wherein the machine includes an inlet work station having a device for forming a plurality of separate bars of dough and the machine also includes an outlet work station having a device for forming a continuous spiral in each of the bars of dough with the spirals interlocking to form a braided roll of dough. The machine assembly further includes a conveyor assembly for transporting the bars of dough between the inlet and outlet work stations while kneading and rolling the bars into their final configuration.
    Type: Grant
    Filed: March 4, 1980
    Date of Patent: June 15, 1982
    Assignee: Henberg Oy
    Inventor: Teijo T. T. Tamminen
  • Patent number: 4323528
    Abstract: Method for producing large size, low density, elongated thermoplastic cellular bodies comprising the steps of forming a mixture of a thermoplastic polymer and a blowing agent dissolved therein under pressure and at a temperature at which the viscosity of the mixture is sufficient to retain the blowing agent when the mixture is allowed to expand, extruding said mixture into a holding zone under conditions that prevent said mixture from foaming, the holding zone having an outlet die orifice opening into a zone of lower pressure and temperature at which said mixture foams and an openable gate closing the die orifice; periodically opening said gate and substantially concurrently applying mechanical pressure by a movable ram on the mixture, preferably while scraping the sides of the holding zone with said ram, to eject the mixture from the holding zone through the die orifice at a rate in excess of that at which substantial foaming in the die orifice occurs and less than that at which substantial irregularities in
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: April 6, 1982
    Assignee: Valcour Imprinted Papers, Inc.
    Inventor: Frederick H. Collins
  • Patent number: 4323340
    Abstract: Disclosed are apparatus and a method for forming multi-directionally oriented plastic articles by shearing a thermoplastic material in a non-linear shear pattern while the material is at a temperature conducive to orientation and further processing the material by known plastic forming techniques to form an article in which the material remains oriented. More specifically, thermoplastic material is plasticized and accumulated in an amount at least sufficient to form the article, and the material is expressed under pressure from the accumulated body to and through an orifice. The material is non-linearly sheared prior to its issuance from the orifice to induce orientation stresses into the material, and, during shearing, the material is at a temperature which is conducive to orientation.
    Type: Grant
    Filed: June 30, 1980
    Date of Patent: April 6, 1982
    Assignee: Owens-Illinois, Inc.
    Inventor: Albert R. Uhlig