With Shaping Between Extruding And Cutting Steps Patents (Class 264/151)
  • Patent number: 4393023
    Abstract: An apparatus is disclosed for preparing a tubular parison, which is continuously extruded in an extrusion direction from an extrusion head, and for subsequently transferring the parison to a blow molding machine. The apparatus provides improved control of the wall thickness of the parison and can be used with particular advantage in making articles requiring parisons of large diameter and length. The apparatus includes a parison stretching mechanism that grasps and seals the parison at one location along its length and stretches the parison at a controlled rate while being extruded in the extrusion direction. The apparatus also sequentially severs sections of the parison from the remaining continuously extruded portion and transfers each section to a stationary blow molding machine out of the path of this remaining portion.
    Type: Grant
    Filed: August 31, 1981
    Date of Patent: July 12, 1983
    Assignee: The Plastic Forming Company, Inc.
    Inventor: Peter T. Schurman
  • Patent number: 4385564
    Abstract: A pallet has at least one board secured to a plurality of like elongated parallel stiffening ribs having flat upper sides secured to the board and lower sides formed with downwardly projecting and longitudinally spaced bumps. These ribs are each formed by filling into an upwardly open elongated mold of generally regular cross section a mass of coarse and fine particles and a binder in such a manner that the fine particles are concentrated in the lower portion of the mass and the coarse particles are concentrated in the upper portion of the mass. The mass is then compressed downwardly in the mold to a relatively great extent at several longitudinally spaced-apart locations and to a lesser extent therebetween to form upwardly projecting bumps or feet between these locations. The thus compressed mass is cured into a stiffening rib which is inverted and has the board secured to its planar upper surface opposite its feet.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: May 31, 1983
    Inventor: Anton Heggenstaller
  • Patent number: 4359446
    Abstract: A sweep ell production apparatus (10) receives extruded plastic pipe (98) from an extruder (96). The plastic pipe (98) is passed through a curved sizing sleeve (100) which imparts a curvature to the plastic pipe (98) while at the same time sizing the pipe wall thicknesses and exterior diameter. After the pipe (98) passes through the sizing sleeve (100) a clamp (84) is secured about the periphery of the pipe (98). The clamp (84) is driven by means of a motor (34) which causes the clamp (84) to travel along an arc (112) which corresponds with the radius of curvature of the sizing sleeve (100). As the clamp (84) draws pipe (98) along the arc (112) of travel, the pipe (98) is set to have the desired radius of curvature. After a selected arc length of pipe (98) is produced, the pipe section is cut to produce the desired sweep ell.
    Type: Grant
    Filed: February 23, 1981
    Date of Patent: November 16, 1982
    Assignee: Nipak, Inc.
    Inventor: Joseph A. Levens
  • Patent number: 4351788
    Abstract: A method for manufacturing cleaving split tiles from a continuous extrusion including forming a plurality of internal channels during extruding followed by the shaping of the corners and exterior surfaces of the extrusion and forming shaped vertical surfaces defining two of the tiles sides so that they blend with the other shaping of the extrusion with the formation of the vertical surfaces occurring so that the internal channels are not compressed. The extrusion is severed along a vertical groove formed when the vertical surfaces are formed with the severed portions being subsequently fired and thereafter split into tiles.
    Type: Grant
    Filed: February 26, 1980
    Date of Patent: September 28, 1982
    Assignee: Mosa, B.V.
    Inventor: Gustaaf J. Schreurs
  • Patent number: 4340558
    Abstract: Process for forming a scrim-reinforced film wherein a molten, film-forming plastic, such as polyethylene, in a high state of fluidity is fed onto an unsupported scrim and solidified by cooling to produce a scrim at least substantially completely enclosed and surrounded by the plastic. The film, thus produced, can be formed into a high strength bag container by a folding and cutting operation utilizing hot knife means capable of fusing and thus sealing the plastic. In a preferred embodiment, the plastic is extruded onto the scrim.
    Type: Grant
    Filed: December 7, 1979
    Date of Patent: July 20, 1982
    Assignee: Colgate-Palmolive Company
    Inventor: Thomas C. Hendrickson
  • Patent number: 4340557
    Abstract: A method is disclosed for substantially removing surface defects that are attendant with plastic blanks formed by cutting out squares from sheet stock material that are subsequently forged by means of non-melt, high pressure or solid-phase forming of preforms and thereafter thermoforming said preforms into containers. The blank itself comprises a tabular body having a pair of major faces located substantially parallel to one another, minor faces integrally formed and extending outwardly from said major faces, said minor faces presenting a smooth surface commensurate to that of said major faces, and a vertical portion integrally formed with said minor faces and defining an outer peripheral band or line having an unsmooth surface.
    Type: Grant
    Filed: December 16, 1980
    Date of Patent: July 20, 1982
    Assignee: Ball Corporation
    Inventor: Robert M. Gross
  • Patent number: 4321226
    Abstract: Tubular products are provided by applying a first, inner plastic layer onto a core wire and by applying a wire sheathing onto the first plastic layer as a continuous structure thereon. The wire sheathing is then locally removed to provide defined, spaced areas without wire sheathing and intermediate areas including the wire sheathing, and the structure thus provided is covered by applying a second, outer plastic layer thereon, thereby providing a strand structure. As a next step, this strand structure is cut at one limitation of each area without wire sheathing, whereby strand pieces are provided having one end portion which has no wire sheathing therein. The core wire piece left in each strand piece is then removed, thereby providing a tubular product having a body portion including wire sheathing and being completely integral with an end or tip portion without wire sheathing.
    Type: Grant
    Filed: February 15, 1980
    Date of Patent: March 23, 1982
    Assignee: A/S Surgimed
    Inventor: Jorgen Markling
  • Patent number: 4301102
    Abstract: A process is provided for preparing self-crimpable monocomponent fibers by the sequential steps of melt-spinning a polymer of polyhexamethylene adipamide or polycaproamide into filaments, quenching the filaments by a cross-flow of air to an average surface temperature of about 40.degree. to 130.degree. C., applying an effective amount of water to the filaments while they are in said temperature range, and then drawing the filaments at a draw ratio of at least 1.3:1 to obtain a tenacity of at least 1.3 gpd, a break elongation of less than 120% and a latent, substantially helical, frequently reversing crimp of at least 6 filament crimp index. The novel products of the invention, which include fibers and yarns, in self-crimpable or crimped condition, are particularly suited for use in carpets.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: November 17, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George A. Fernstrom, Harold H. Hebeler, Perry H. Lin, Robert R. Moneymaker
  • Patent number: 4261940
    Abstract: Sticks of foamable thermoplastic material are provided with grooves in at least one surface. These grooves extend width-wise of the stick. In addition, the grooves are disposed in equi-spaced relation along one surface of the stick, or in spaced-apart series or groups on only one surface, or in series or groups on opposite surfaces and in spaced-apart relation. Upon foaming, the sticks form foamed elements of various shapes, each of which has at least one curvilinear portion such as, for example, a corkscrew shape, an annular shape or shapes with reverse bends.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: April 14, 1981
    Inventor: Harry Bussey, Jr.
  • Patent number: 4251306
    Abstract: A method of producing an endless toothed belt of synthetic or plastics material, or similar extrudable material, having a wire- or thread-like reinforcing insert which extends in the circumferential direction of the belt and having a fabric cover covering the toothed side of the belt. A finite belt strand is formed in a closed mold cavity from introduced liquid plastics material and from a fabric strip which is introduced along that shaping surface of the mold cavity which forms the toothed side of the belt strand, thus coating the toothed side of the belt strand with the fabric strip. That side of the belt strand which is remote from the toothed side of the belt is provided with a plurality of grooves extending in the longitudinal direction of the belt strand.
    Type: Grant
    Filed: January 15, 1979
    Date of Patent: February 17, 1981
    Assignee: BRECO Kunststoffverarbeitungs-GmbH & Co. KG
    Inventor: Rudolf Breher
  • Patent number: 4247270
    Abstract: In the process, the strands, which are spun as a fused mass, are initially drawn, then preferably stretched, crimped or textured, and converted into helical windings. The helical windings are laid down on an endless conveyor formed by two conveyor belts laterally spaced from each other. The laid down helical winding turns are then cut between the two endless conveyors to produce two substantially identical fiber lengths from each helical winding turn. The melt spinning of the strands may be effected at such a high speed that the drawing of the filaments or fibers can be omitted. The helical winding turns, prior to cutting thereof, may be subjected to at least one after-treatment. The apparatus includes a rotary distributor into which the crimped strands are supplied substantially axially for conversion into helical winding turns, and includes endless belts tangentially engaging the helical winding turns to move the same downwardly onto the spaced pair of endless conveyor belts.
    Type: Grant
    Filed: January 29, 1979
    Date of Patent: January 27, 1981
    Assignee: IWKA-Industrie-Werke-Karlsruhe Augsburg AG
    Inventor: Gunter Schubert
  • Patent number: 4244995
    Abstract: A picture frame and method of making the same from a rising tube of fluent extruded plastic. The rising tube collapses inwardly to form the frame body as a ring of interfolded wrinkly sinuous corrugations. A stepped annular ring on the face of the extruder die is shaped to form a flat back for the frame along with a rabbeted inner rim edge suitable to seat a picture, mat and a backing plate.
    Type: Grant
    Filed: March 28, 1979
    Date of Patent: January 13, 1981
    Inventor: Gerald E. W. Gunn
  • Patent number: 4234536
    Abstract: A method of manufacturing thin-walled articles by thermoforming from crystalline thermoplastic sheet or web material wherein the sheet or web is rapidly precooled from extrusion temperature, and the outer surface layers reheated prior to thermoforming.
    Type: Grant
    Filed: September 27, 1978
    Date of Patent: November 18, 1980
    Inventors: Alfons W. Thiel, Barbara Geppert
  • Patent number: 4234530
    Abstract: A method for manufacturing thin-walled articles from crystalline thermoplastic material comprising the steps of extruding a continuous web of hot crystalline thermoplastic material at an extrusion temperature above the crystalline melting temperature range of the material, substantially immediately rapidly precooling the opposite surfaces of the web to form therealong thin supportive layers having a temperature in the range wherein the said material is not further plastically deformable and wherein further growth of crystals is essentially avoided, while the hotter core material between said layers is cooled to a temperature adjacent to but above the crystalline melting temperature range and is held in a substantially crystal free condition, transporting the so precooled web into a thermoforming station within a sufficiently short time period to essentially maintain over the web thickness the above mentioned temperature profile produced by precooling, and then thermally forming at a rapid cooling rate said we
    Type: Grant
    Filed: September 27, 1978
    Date of Patent: November 18, 1980
    Inventors: Alfons W. Thiel, Barbara Geppert
  • Patent number: 4222982
    Abstract: A process for preparing electrostatographic toner particles having improved mechanical properties and controlled particle size and size distribution is provided through molecular orientation of glassy, brittle, semicrystalline, low molecular weight polymers. Molecular orientation results in more flexible polymers and greatly increases their yield stress, modulus and mechanical fatigue lifetime. The molecular orientation of these polymers is obtained by extrusion of fibers or films thereof.
    Type: Grant
    Filed: January 19, 1979
    Date of Patent: September 16, 1980
    Assignee: Xerox Corporation
    Inventors: Charles L. Beatty, Jean-Claude Pollet
  • Patent number: 4199627
    Abstract: A decorative grass or grass-like product in the form of strips of plastic material of predetermined dimensional characteristics having color, anti-static agents and flame retardants incorporated therein prior to extrusion of the resin thereby preventing rub off of the color, minimizing clinging of grass to the hands and clothes of a decorator, thus facilitating handling of the grass, and assuring that the grass will consistently exceed the flammability requirements of the Federal Hazardous Substances Act Regulations in order to be labeled "non-flammable". Processes for making the grass include an extruder for plastic material and including a film extrusion die or a strand extrusion die. When a film is extruded, the film is cooled and slit longitudinally into strips of predetermined width. In another process, the extruded strips or strands are cooled.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: April 22, 1980
    Assignee: Highland Manufacturing & Sales Co.
    Inventors: Erwin H. Weder, Donald E. Weder
  • Patent number: 4191723
    Abstract: Novolak phenolic resin compositions are formed into molding granules by homogenizing the composition above the melting point of the resin, calendering the homogenized composition with conversion into a coherent sheet, rolling the sheet between a pair of rollers, at least one of which is indented, to produce a coherent embossed sheet, fracturating the embossed sheet with separation of the granules having substantially the shape and size of the embossments, coating the granules with a phenolic compound and heat-treating the coated granules by flowing a stream of inert gas having a temperature not exceeding 130.degree. C.The resulting granules are free-flowing, free from a tendency to release dust and particularly suitable for injection molding.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: March 4, 1980
    Assignee: Euteco S.p.A.
    Inventors: Silvio Vargiu, Pier L. Manzoni, Mario Bernasconi
  • Patent number: 4187268
    Abstract: Process by which moulded articles are maufactured from clay. A continuously produced strand of the material in question is sprinkled with sand, whereafter at one location a piece is severed from the end of the strand at regular intervals, by a cutting apparatus, which piece then enters a mould. In the course of all phases of the process the strand and each severed piece thereof remain directed along one vertical downwardly directed line of movement.
    Type: Grant
    Filed: January 14, 1975
    Date of Patent: February 5, 1980
    Assignee: Machinefabriek W. Hubert & Co. B.V.
    Inventor: Hendrik Sinnema
  • Patent number: 4159297
    Abstract: A process for the production of crimped filaments of semi-crystalline polyolefins or blends of polyolefins with other materials by melt drawing at 100 meters per minute or less, rapidly and asymmetrically cooling at least a portion of the filaments, forming the filaments into a tow and subjecting the tow to a heat treatment without drawing at at least 100.degree. C. and thereafter drawing the filaments in two stages, the last of which is at a temperature of at least 70.degree. C. With the practice of the process of this invention, there is provided a useful crimp of at least two crimps per centimeter which develops after the filaments are relaxed and subjected to a further heat treatment which may be applied either to the filaments or to products produced therefrom when in a relaxed state subsequent to drawing.
    Type: Grant
    Filed: September 17, 1976
    Date of Patent: June 26, 1979
    Assignee: James Mackie & Sons Limited
    Inventors: John K. P. Mackie, Samuel McMeekin
  • Patent number: 4156752
    Abstract: New, flexible intumescent protection sheeting of unusually uniform thickness have been prepared from epoxy-polysulfide compositions containing microfibers and the ammonium salt of 1,4-nitroaniline-2-sulfonic acid, as disclosed in U.S. Pat. No. 3,663,464, except that an ammonium salt particle size in the order of 5 to 8 microns and a fiber size of about 1/128th inch in length and 3 to 5 microns in diameter have been found critical to obtain the required density of 1.46 to 1.50 g/cc. The insulation sheeting is prepared by a continuous process involving vacuum mixing, calendering, and curing under very strict conditions which depend to some extent upon the thickness of the sheet produced.The resulting flexible sheet can be wrapped easily and tightly around small diameter missiles, thus affording them for the first time, protection from fire for at least 5 minutes.
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: May 29, 1979
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Salvatore R. Riccitiello, Paul M. Sawko
  • Patent number: 4150080
    Abstract: A method of and apparatus for separating off waste material from a moulded article in the production of hollow articles of thermoplastics material by a blowing process in a multi-part mould involves pinching together regions of a partly-made article during closure of the mould parts around it and once a satisfactory weld seam has been created at the pinch regions then increasing the closure speed of the mould parts. Control of the mould closure speed may be effected by open loop control or by automatic control, and may be made dependent on time and/or on displacement of the mould parts. The increased final closure speed can with advantage be equal to the mould closure speed at which the mould parts are moved up to the beginning of the pinching process.
    Type: Grant
    Filed: November 29, 1976
    Date of Patent: April 17, 1979
    Assignee: Kautex-Werke Reinold Hagen GmbH
    Inventor: Reinold Hagen
  • Patent number: 4137288
    Abstract: The invention relates to a method for producing ceramic tiles with ornamental shapes from clay emerging from an extrusion press. Shaped punching tools are disposed on either side of the clay column from which the tiles are to be formed, and are moved on a carriage in the direction of the moving column at a speed corresponding to the speed of the moving column. Supports hold the clay while it is being punched. A drive system such as a fluid actuated drive system moves the punching tools, and the drive system is selectively actuated in response to movement of the carriage. Cutting wires sever each column section acted upon by the punching tools from the rest of the column.
    Type: Grant
    Filed: December 10, 1975
    Date of Patent: January 30, 1979
    Assignee: Lingl Corporation
    Inventor: Hans Lingl
  • Patent number: 4102961
    Abstract: The specification describes a method for the production of densely sintered large ceramic plates of small thickness. The ceramic composition is first extruded by means of an extruder and is then rolled out from the resulting billets in a direction perpendicular to the extrusion axis, this rolling operation is carried out by a further rolling out operation in the axial direction of the billets. The cutting out of the plates to the desired format is by means of a pressing knife acting perpendicularly with respect to the plate plane. Following this the plates are dried and fired.
    Type: Grant
    Filed: March 18, 1977
    Date of Patent: July 25, 1978
    Inventor: Gottfried Cremer
  • Patent number: 4100239
    Abstract: Method for making hollow plastics insulating wall panel. The plastic material, in a flowable form, is continuously forced about a core to form an enclosed central cavity or chamber. The continuous plastic material is then severed and cavity sealed in a vacuum environment before final curing of the resulting hollow insulation product.
    Type: Grant
    Filed: May 23, 1977
    Date of Patent: July 11, 1978
    Inventor: Lonnie E. Daniels, Jr.
  • Patent number: 4088721
    Abstract: The thickness of a cut length of a continuously extruded elastomer is controlled by sampling the weight of a section of the continuous extrusion at a running-weigh-scale each second; computing and storing one-minute averages of the running-weigh-scale samples; sampling the weight of a cut length of the extrusion at a check-weigh-scale; comparing the check-weigh-scale value to the oldest stored running-weigh-scale one-minute average to obtain a targeted average; comparing the targeted running-weigh-scale average to the newest stored running-weigh-scale one-minute average to obtain a deviation from the targeted value if one exists; and converting the deviation from the targeted running-weigh-scale value to a control signal for increasing or decreasing the speed of a take-away belt positioned at the extruder exit orifice to vary the thickness of the extrusion in accordance with the deviation control signal and the speed of the belt.
    Type: Grant
    Filed: September 24, 1976
    Date of Patent: May 9, 1978
    Assignee: The Goodyear Tire & Rubber Company
    Inventor: Anthony M. Apicella, Jr.
  • Patent number: 4083838
    Abstract: A continuous process for making endless toothed belts using a reinforced toothed belt preform of indefinite length by spirally winding the preform around toothed wheels spaced a variable distance while fusing the spiral wraps into a belt tube. One of the wheels forms a closed arc shaped mold chamber sealed toward the outside by a molding belt with one end of the chamber sealingly closed by the entering length with the laterally exiting flexible length or tube advancing axially through the other end and cut to the desired width to form individual belts. The circumferential length is varied by varying the distance between the wheels. The preform can be accurately formed from an unfinished belt by fusing around the fixed radial distance supported reinforcement using wheels in cooperation with a closed chamber prior to forming the tube.
    Type: Grant
    Filed: April 12, 1977
    Date of Patent: April 11, 1978
    Assignee: BRECO Kunststoffverarbeitungs-GmbH & Co. KG
    Inventor: Rudolf Breher
  • Patent number: 4062919
    Abstract: A method for making a plastic, relatively flexible stringer for a slide fastener is disclosed. The stringer blank is extruded in a relatively rigid U-shaped form and, subsequently, a plurality of longitudinally spaced, transverse slots are die cut in the stringer blank in order to provide a series of transverse, substantially parallel ladder-like portions wherein each of the ladder-like portions includes an interlocking head member. A plurality of longitudinally spaced apart seats are also formed by a die cutting step in order to define neck portions of reduced thickness about which the stitches are placed in order to secure the fabric to the stringer.
    Type: Grant
    Filed: May 21, 1976
    Date of Patent: December 13, 1977
    Assignee: U. Zip International, S. A.
    Inventors: Fred H. Rojahn, Jose Lichtenberg
  • Patent number: 4056593
    Abstract: A method for producing an article-catching strip consisting in starting from a preferably extruded strip of material provided on at least one side with longitudinal ribs and in cutting across said ribs notches defining between same substantially hook-shaped elements adapted to catch a similar strip or a piece of fabric. The invention covers also the corresponding arrangement which includes an extruding machine, a drum or the like guiding means feeding the ribbed strip to a cutting system beyond which the strip provided with its article-catching elements may be stretched in a drawing frame to more widely space said elements.
    Type: Grant
    Filed: June 21, 1974
    Date of Patent: November 1, 1977
    Assignee: Repla International S.A.H.
    Inventor: Jose Luis de Navas Albareda
  • Patent number: 4054550
    Abstract: An improved process is provided for producing cigarette filters comprised of a substantially open-cell foamed thermoplastic polypropylene resin wherein a mixture comprising a thermoplastic polypropylene resin, a volatile blowing agent and a nucleating agent is extruded through a die to produce a strand of foamed resin with the strand then being cut into individual filter elements. The improvement comprises employing as a primary nucleating agent from 0.1 to 40 percent by weight, based on the weight of the resin, of a particulate compound of a metal selected from Groups IIA, IIIA or IVA of the Mendeleef periodic table of elements together with from 0.01 to 5.0 percent by weight, based on the weight of the primary nucleating agent, of a synergist consisting of an organic compound having a hydrophobic group and a hydrophilic group. A particularly effective combination is the use of calcium carbonate as the primary nucleating agent and potassium benzoate as the synergist compound.
    Type: Grant
    Filed: April 9, 1975
    Date of Patent: October 18, 1977
    Assignee: Monsanto Limited
    Inventors: Frederick John Parker, Durgacharan Sen
  • Patent number: 4049761
    Abstract: In the manufacture of oriented hollow articles made of thermoplastic material by the steps of extruding a continuous hot tubular parison of thermoplastic material; pre-blowing such parison in a pre-blowing mold to produce preforms having a cylindrical body with a diameter not more than 20% greater than that of the parison; thermally conditioning the resulting preforms at a temperature sufficient to cause orientation of the thermoplastic material when it is being stretched; and effecting a final blow-molding of the thermally conditioned preforms, the mechanical properties of the resulting articles in the vicinity of their base are improved by carrying out the pre-blowing step while holding each parison tightly between two half-molds defining a cavity which has the shape, at the location of the base of the preform, of a quarter sphere of diameter equal to that of the preform, and cutting off the resulting flash by means on an elongated blade having a semicircular cross section and a diameter corresponding to th
    Type: Grant
    Filed: March 11, 1975
    Date of Patent: September 20, 1977
    Assignee: Solvay & Cie.
    Inventors: Michel Lorge, Roger Houba
  • Patent number: 4041119
    Abstract: A column of striated soap extruding from a plodder nozzle is subjected to torque for obtaining spiral striations in the final soap bar.
    Type: Grant
    Filed: July 16, 1975
    Date of Patent: August 9, 1977
    Assignee: Colgate-Palmolive Company
    Inventor: Charles F. Fischer
  • Patent number: 4035454
    Abstract: Wraps to hold line guides on a fisherman's rod are formed as sleeve-like units by the embedment of a length of wound thread in a clear, elastomeric plastic resin, or by forming a cylindrical sleeve of elastic plastic resins. The sleeve-like wraps are expanded in diameter by an expanding tool and then chilled, or "frozen" to remain in an expanded state after the expanding tool is removed, and while expanded, the wraps are fitted onto a fishing rod and over the feet of line guides on the rod. Thereafter, warming of the frozen wraps to ambient temperatures permits them to contract to their original size to fit tightly upon the rod. A turret type of apparatus including expanders is provided to receive, expand, freeze and permit removal of the expanded wraps from the expanders for production assembly operations.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: July 12, 1977
    Inventor: Gerald B. Klein
  • Patent number: 4021520
    Abstract: A process is provided for the manufacture of filament yarns having fine protruding filament ends, which comprises subjecting filament yarns, wherein at least part of the filaments consist of polymers the lateral bending resistance (Knickscheuerbestandigkeit) of which can be thermally influenced, to an intermittent sectional treatment, thus ensuring that determined sections of the filaments have a low lateral bending resistance, and by subsequently breaking these sections of low lateral bending resistance by transverse stress, which causes formation of the desired free filament ends.
    Type: Grant
    Filed: March 12, 1974
    Date of Patent: May 3, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl Heinrich, Fritz Schneider
  • Patent number: 4009235
    Abstract: An improved method for reclaiming waste plastic materials generated during an extrusion coating operation. A rotating funnel or other device is used to gather the hot molten plastic waste material and twist it into the shape of a rope. The plastic rope is passed through a cooling bath and one or more pinch rollers. After passing through the rollers, the plastic rope is spooled, chopped, or fed to a plastics processing machine.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: February 22, 1977
    Assignee: Eastman Kodak Company
    Inventor: Thomas W. Bober
  • Patent number: 4001366
    Abstract: Self-gripping devices are disclosed and include a base having one or more integral trains of generally upright gripping elements which are adapted to penetrate and become lodged in a receiving material and especially receiving materials containing fibrils to form a self-gripping connection. The gripping elements in each train have a common origin in a continuous rib integral with the base. Self-gripping devices having a plurality of gripping elements capable of unique self-gripping action are also disclosed.A method is disclosed wherein a structure is formed with integral ribs which are cut to form spaced apart gripping elements.
    Type: Grant
    Filed: September 26, 1973
    Date of Patent: January 4, 1977
    Assignee: Ingrip Fasteners Inc.
    Inventor: George C. Brumlik
  • Patent number: 3998919
    Abstract: A process for making a plastic pirn sleeve bearing rows of circumferential fine grooves having flush ends to prevent filament entangling is disclosed. The process involves indenting the external surface of a thermoplastic tube by adjusting the temperature of the external surface of the tube to a temperature above its softening point, rolling at least three die wheels each in a separate path along the length of the surface of the tube while the tube is supported on a mandrel and at the same time pressing the die wheels against the surface of the tube to form permanent indentations therein.
    Type: Grant
    Filed: March 28, 1974
    Date of Patent: December 21, 1976
    Assignee: Du Pont of Canada Limited
    Inventor: Thomas Urquhart
  • Patent number: 3995004
    Abstract: A process is provided for the manufacture of filament yarn having protruding filament ends on the basis of synthetic high polymers by melt spinning of the polymers through spinning nozzles, which comprises subjecting the multifilaments still hot after having left the spinning nozzle to a section cooling which causes determined sections of the single filaments to have a different molecular structure, and by subsequently drawing the filaments in a ratio which is greater than corresponding to those filament sections having a lower drawing ratio, and smaller than corresponding to those filament sections having a higher drawing ratio, thus causing the formation of determined breaks which supply the desired fiber ends.
    Type: Grant
    Filed: March 12, 1974
    Date of Patent: November 30, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl Heinrich, Klaus-Dieter Scholz
  • Patent number: 3993726
    Abstract: Methods of making continuous length articles of reinforced plastic material includes passing rovings of temperature resistant material through a crosshead extruder to impregnate the rovings with a thermoplastic polymer under high pressure. The impregnated rovings are pulled from the extruder through a die and are cooled and shaped into a void free article having a desired cross-sectional shape.
    Type: Grant
    Filed: January 16, 1974
    Date of Patent: November 23, 1976
    Assignee: Hercules Incorporated
    Inventor: Richard L. Moyer
  • Patent number: 3986807
    Abstract: A plurality of molds, each consisting of a pair of relatively movable mold halves, are mounted on a turntable equidistant from the center of turntable rotation, and are moved successively through a receiving sector where they engage and grip a workpiece such as a heated tube fed tangentially to the circular path of movement of the molds. Positioning pillars located on each side of a workpiece cutting device mounted between adjacent molds, engage the workpiece and correct the attitude thereof relative to each receiving mold and to each cutting device, which also is equipped with means for gripping the cut ends of the workpiece when each mold is opened at the end of the molding cycle.
    Type: Grant
    Filed: September 19, 1974
    Date of Patent: October 19, 1976
    Assignee: Hitachi Shipbuilding & Engineering Co., Ltd.
    Inventors: Kazuo Takegami, Hayato Doi
  • Patent number: 3984514
    Abstract: A process is disclosed for producing extremely fine polyamide/polystyrene fibers which include the steps of forming a molten blend consisting of from about 35 weight percent up to about 45 weight percent of a polyamide, preferably polycaprolactam and, correspondingly, from about 65 weight percent down to about 55 weight percent of a polystyrene, forcing this molten blend through an extrusion die to form a structure such as a strand, monofilament, sheet or film, melt drawing the extruded structure at a draw ratio of at least 4:1 to orient the same and thereby obtain a fibrillatable structure, and thereafter mechanically fibrillating the oriented, fibrillatable structure by cold drawing whereby the structure spontaneously and completely breaks up into extremely fine polyamide/polystyrene fibers. The blend may optionally additionally contain up to about 15 weight percent of an ethylene/acrylic acid copolymer containing about 20 weight percent acrylic acid.
    Type: Grant
    Filed: January 24, 1972
    Date of Patent: October 5, 1976
    Assignee: Gulf Research & Development Company
    Inventors: Raymond Paul Anderson, Francis Ross Galiano
  • Patent number: 3981951
    Abstract: Button rods are made of different colored resins containing thixotropic agents and having catalyst and promoter agents added to separated portions of each resin so that when the resins are combined their gel time is accelerated. The combined resins are mixed both for mixing purposes and to lower the apparent viscosity, and the resins are fed through nozzles and into an inclined trough. The nozzles are reciprocated in arcs to lay the resins in a zig zag pattern in the trough, and the resins flow from the trough into an inclined casting tube where they quickly attain a relatively high apparent viscosity until they are removed from the tube before completely hard. The rods can then be sliced into button blanks or hardened and ground into beads.
    Type: Grant
    Filed: October 7, 1974
    Date of Patent: September 21, 1976
    Assignee: Rochester Button Company
    Inventor: Seymour I. Richman
  • Patent number: 3968621
    Abstract: Method of making multiple container carrier stock comprising strands of a resilient and deformable plastic material that has been extruded and fused in the molten or semi-molten state.
    Type: Grant
    Filed: January 31, 1975
    Date of Patent: July 13, 1976
    Assignee: Illinois Tool Works Inc.
    Inventor: Ougljesa Jules Poupitch
  • Patent number: 3963821
    Abstract: Method for producing a synthetic fiber substantially comprising dissolving a composition consisting essentially of:A. 5-40 percent by weight of a copolymer consisting ofA. 20-80 percent by weight of polyvinyl alcohol, andB. 80-20 percent by weight of acrylonitrile, andB. 60-95 percent by weight of a copolymer consisting ofC. 55-95 percent by weight of styrene, andD. 5-45 percent by weight of acrylonitrile, in dimethyl sulfoxide or dimethyl acetamide as a solvent, and wet-spinningThis fiber is used for producing paper and has a potentially fibrillar texture. When beaten, it forms a synthetic pulp having stalk fibrils and micro fibrils extending from the stalk fibrils.High-tenacity synthetic paper can be made because this synthetic pulp is self-adhesive.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: June 15, 1976
    Assignee: Toray Industries, Inc.
    Inventors: Hiromu Takeda, Takuichi Kobayashi, Koichiro Oka, Kazumi Tanaka
  • Patent number: 3950473
    Abstract: Synthetic pulp having a peculiar structure is prepared by making a composition consisting of 50 to 90 parts by weight of polypropylene having a melt flow rate of 30 to 150 and 50 to 10 parts by weight of low density polyethylene having a melt index of 0.5 to 10 into a film having a thickness of 70 .mu. or less, uniaxially stretching the film, cutting the stretched film to a predetermined length of 5 mm or less, and fibrillating the cut film by a crumpling and disintergrating action mainly by blows and air whirling stream. A suitable apparatus for such fibrillation is presented. Synthetic pulp thus prepared provides a paper-like material having superior properties by blending it with e.g. wood pulp.
    Type: Grant
    Filed: May 21, 1973
    Date of Patent: April 13, 1976
    Assignee: Chisso Corporation
    Inventors: Eitaro Iwahori, Mitsuo Kurita, Mitsumasa Uno
  • Patent number: 3949110
    Abstract: A method of manufacturing heat shrinkable tubing having one portion thereof in the form of a single tube and the remaining portion thereof in the form of plural tubes. The heat shrinkable tubing is manufactured by extruding a thermoplastic tube and then longitudinally sealing the tube periodically with applied pressure while the tube is heated to form predetermined plural tube lengths. The tube is then subjected to irradiation, heated to at least the softening temperature of the material of the tube and it is then partially inflated and thermoset by cooling to impart heat shrinkable properties to the tube. The heat shrinkable tube so formed is then periodically cut to form a plurality of heat shrinkable tube sections which each consist of a single tube portion and a remaining plural tube portion.
    Type: Grant
    Filed: May 7, 1974
    Date of Patent: April 6, 1976
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Toyoshi Nakajima, Keiichi Kojima, Hiroshi Nishitani, Toshifumi Inui
  • Patent number: 3941639
    Abstract: Corrugated plastic tubes simultaneously feeding from a plurality of sources are doffed, stacked in nesting relation and formed into bundles of a predetermined number of tubes in accordance with the present invention. The corrugated plastic tubes are produced in continuous length in separate production lines, cut to predetermined lengths, and fed along predetermined paths to respective doffing stations where the tubes are doffed into a common hopper positioned adjacent the doffing stations. Upon a predetermined number of the tubes being doffed into the hopper and accumulated in stacked and nested relation, the tubes are advanced to a bundling station where strapping machines secure pliable strapping elements around the stacked and nested tubes to form the same into compact bundles. The bundles are then removed from the bundling station ready for shipment or storage.
    Type: Grant
    Filed: May 29, 1973
    Date of Patent: March 2, 1976
    Inventor: Ernest J. Maroschak
  • Patent number: 3939236
    Abstract: The method for blow molding foam walled plastic using a quadrisectional mold. A parison of foamed plastic may be blow molded to assume the contour of the closed mold, after which the molded shape is severed into two portions and ejected. Desirably, cellular plastic is blow molded to form hot drink cups.
    Type: Grant
    Filed: January 24, 1973
    Date of Patent: February 17, 1976
    Assignee: Cosden Oil & Chemical Company
    Inventor: Granville J. Hahn
  • Patent number: 3933965
    Abstract: Pen nibs are made by extruding rods from fused thermoplastic material, with a cavity in the rod of star-shaped cross-sectional configuration. The extruded rod is then cooled and mechanically drawn to reduce its diameter about 50%, which closes the inner ends of the arms of the star and brings them together at the center of the rod, while leaving the outer ends of the arms relatively large. The resulting product is then sharpened at both ends for use as a pen nib.
    Type: Grant
    Filed: May 13, 1974
    Date of Patent: January 20, 1976
    Assignee: Global Control Corporation
    Inventors: Ermenegildo Gallone, Francesco Mazzier
  • Patent number: RE29242
    Abstract: Manufacture of rapidly hardening phenol formaldehyde resin molding compositions having improved thermal stability and good flow characteristics by incorporating into the molding compositions hexamethylenetetramine in the form of a metaboric acid addition product. The resulting molding composition is then rolled and ground to produce the molding composition of improved properties.
    Type: Grant
    Filed: July 15, 1975
    Date of Patent: May 31, 1977
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventor: Kurt Schmoll
  • Patent number: RE29674
    Abstract: Cigarette filters are made by passing a continuous rod of filter material continuously through a moving die to form a continuous filter element having a repeated pattern of staggered grooves so arranged that the continuous filter element can be cut at regular intervals to form individual filter elements each having in its peripheral surface a number of grooves extending substantially axially alternately from opposite ends of the element.
    Type: Grant
    Filed: November 20, 1975
    Date of Patent: June 20, 1978
    Assignee: Molins Limited
    Inventors: Francis Auguste Maurice Labbe, Michael Bruce Mitchell