| Patent Number |
Title Of Patent |
Date Issued |
| 5045252 |
Method and apparatus for controlling rotary extruder |
September 3, 1991 |
| Method and apparatus for automatically controlling the operation of a rotary extruder, including using a pressure transducer (38, 40, 42) communicating with the annular space (50) between the barrel (12) and rotor (14) to monitor the hydraulic pressure of the melted polymer, using a |
| 5033861 |
Rotary extruder with internally heated rotor |
July 23, 1991 |
| A rotor assembly for use in a rotary extruder, comprising a rotor rotatably mounted inside a barrel by means of drive and free end bearing assemblies; a coaxial longitudinal bore extending into the rotor from its free end; a conduit disposed within the bore defining a longitudinally exte |
| 4974336 |
Drying method |
December 4, 1990 |
| A method for use in drying particulate matter employing a drier comprising a cylindrical upper section, a frustoconical lower section, a rotatable shaft extending substantially the entire length of the interior of the drier, a plurality of axially spaced arrays of circumferentially space |
| 4887907 |
Rotary extruder with internally cooled rotor |
December 19, 1989 |
| A rotor assembly for use in a rotary extruder, comprising a rotor rotatably mounted inside a barrel by means of drive and free end bearing assemblies; a coaxial longitudinal bore extending into the rotor from its free end; a sleeve within the bore defining a thermally insulated central z |
| 4879138 |
Composition for plastic article with unitarily molded foam layer |
November 7, 1989 |
| A moldable and foamable thermoplastic composition comprising a major portion of moldable polypropylene resin; from about 1.25 to about 6 parts per hundred of resin (pphr) foam concentrate; from about 0.15 to about 1 pphr calcium carbonate; from about 0.03 to about 0.15 pphr amorphous |
| 4872573 |
Plastic closure with barrier coating |
October 10, 1989 |
| A moldable plastic closure comprising a selectively foamed, unitarily molded layer and at least one layer of barrier resin adapted to retard the migration of oxygen-containing gasses through the closure. |
| 4866100 |
Composition for plastic article with unitarily molded foam layer |
September 12, 1989 |
| A moldable and foamable thermoplastic composition comprising a major portion of moldable polypropylene resin; from about 1.25 to about 6 parts per hundred of resin (pphr) foam concentrate; from about 0.15 to about 1 pphr calcium carbonate; from about 0.03 to about 0.15 pphr amorphous |
| 4839969 |
Drying method and apparatus |
June 20, 1989 |
| A method, apparatus and system for use in drying particulate matter employing a drier comprising a cylindrical upper section, a frustoconical lower section, a rotatable shaft extending substantially the entire length of the interior of the drier, a plurality of axially spaced arrays of |
| 4813863 |
Rotary extruder with a gear pump |
March 21, 1989 |
| Rotary extruder apparatus is provided comprising housing (22), recess (29) within housing (22), cylindrical rotor (30) rotatably mounted within recess (29) in housing (22), feed inlet (25), discharge outlet (52) providing fluid communication between recess (29) and diehead (26), in c |
| 4744478 |
Plastic closure with unitarily molded, foamed sealing layer |
May 17, 1988 |
| A molded polymeric container closure comprising at least one substantially unfoamed polymer layer and an integrally molded foamed layer of the same polymer. |
| 4713271 |
Foamed polymer tubing |
December 15, 1987 |
| Process and apparatus are disclosed for manufacturing foamed articles such as tubes used as pipe insulation, which tubes are of a high impermeability and flexibility and are formed of a polymer, such as polyethylene or polypropylene, containing up to as much as 50% of an elastomer. |
| 4621678 |
Heat exchanger apparatus for extruding thermoplastic compositions |
November 11, 1986 |
| Disclosed is heat exchange apparatus for controlling the temperature of a resin after leaving an extruder and prior to extrusion through a die in an extrusion process, comprising a heat exchanger having an inlet and outlet for an extruded heat-plastified resin and an inlet and an outlet |
| 4611987 |
Apparatus for forming multilayer thermoplastic resin extrusions |
September 16, 1986 |
| An injector device for use in forming multilayer extrusions of plastic resins and a method for forming such extrusions. The apparatus includes an injector member that divides the extrudate from the first extruder into two layers and receives at least one extrudate from an additional extr |
| 4552791 |
Plastic container with decreased gas permeability |
November 12, 1985 |
| A container made of an organic resin having improved vapor barrier characteristics is disclosed which achieves an improved barrier by the placement thereon of a thin coating of an inorganic material. |
| 4548570 |
Extrusion apparatus for producing thermoplastic pipe |
October 22, 1985 |
| Apparatus is disclosed for the formation of pipe comprising one or more layers of thermoplastic resin. The apparatus comprises a die housing having a bore therethrough with a mandrel longitudinally supported within the bore by radial members extending from the inside surface of the bore |
| 4526736 |
Process and apparatus for manufacturing flexible foamed articles |
July 2, 1985 |
| Process and apparatus are disclosed for manufacturing foamed articles such as tubes used as pipe insulation, which tubes are of a high impermeability and flexibility and are formed of a polymer, such as polyethylene or polypropylene, containing up to about 25% of an elastomer. |
| 4512943 |
Extrusion process for producing thermoplastic pipe |
April 23, 1985 |
| A process is disclosed for the formation of pipe comprising one or more layers of thermoplastic resin whereby an annular stream of thermoplastic material is transported through an annular extrusion passageway. The downstream annular portion of the extrusion passageway has a radially |
| 4512395 |
Multiple heat exchanger distribution apparatus |
April 23, 1985 |
| Disclosed is a multiple heat exchanger system utilizing an inlet manifold to distribute the flow of thermoplastic material from an extruder to the inlet ends of each of the heat exchangers, and a discharge manifold to converge the flow of thermoplastic material from the discharge ends of |
| 4507071 |
Coextrusion apparatus for producing multiple layered thermoplastic pipe |
March 26, 1985 |
| An apparatus for the formation of a multiple layered pipe comprising a die housing having a bore therethrough with a mandrel longitudinally supported within the bore by a spider to provide an annular extrusion passageway defined by the inside surface of the housing and the outer surface |
| 4501543 |
Rotary extruder |
February 26, 1985 |
| A rotary extruder contains pump rings positioned at opposite ends of the rotor shaft to collect excess thermoplastic melt forced outwardly to the housing ends and to redirect this excess melt to the feed section of the extruder. Redirection of the melt is accomplished by helical grooves |
| 4499041 |
Coextrusion process for producing multiple layered thermoplastic pipe |
February 12, 1985 |
| A process is disclosed for the coextrusion of a multi-layered tube whereby at least one stream of molten polymer from a single-screw extruder is passed through a die; wherein the stream is divided into two concentric streams which are balanced by varying the area of a restrictor orifice |
| 4496408 |
Method for producing biaxially oriented hollow articles |
January 29, 1985 |
| Disclosed is a process for the production of a hollow article comprised of a biaxially oriented thermoplastic resinous material, comprising the steps of heating a sheet of thermoplastic material to a temperature above the orientation temperature of the thermoplastic material; clamping an |
| 4483812 |
Valve plate and feedblock design for co-extrusion apparatus and co-extrusion process using same |
November 20, 1984 |
| Disclosed is an apparatus and process for producing multiple-layer film or sheeting which includes an improved laydown means comprising adjustable cam-actuated control means for controlling the polymer flow and individual layer thickness. |
| 4483669 |
Multiple-layered sheeting apparatus |
November 20, 1984 |
| Disclosed is a process and apparatus for extrusion of multiple-layer sheeting comprising an improved co-extrusion feedblock and valve plate for laying down co-extruded resin streams onto a main extruded polymeric resin. The new design provides advantageous external control of the layer |
| 4478874 |
Methods for improving the gas barrier properties of polymeric containers |
October 23, 1984 |
| Methods are disclosed for the treatment of food, beverage, and medicine containers and the like, which are made of organic polymeric resins, to greatly increase the gas barrier properties thereof. The containers are ion-plated with a very thin flexible layer of an inorganic oxide. |
| 4469651 |
Process for extruding thermoplastic compositions |
September 4, 1984 |
| Disclosed is a process for extruding thermoplastic resinous compositions, comprising the steps of heat plastifying the resinous composition in an extruder; cooling the heat plastified resinous composition exiting from the extruder to a uniform temperature desired for extrusion through an |
| 4451586 |
Process and apparatus for manufacturing flame retardant flexible foamed articles |
May 29, 1984 |
| Process and apparatus are disclosed for manufacturing foamed articles such as tubes used as pipe insulation, which tubes are of a high impermeability and flexibility and are formed of a polymer, such as polyethylene or polypropylene, containing up to about 25% of an elastomer. |
| 4443397 |
Multiple-layered sheeting apparatus and process therefor |
April 17, 1984 |
| Disclosed is an apparatus and process for the production of multiple-layer film or sheeting having desirable surface characteristics, especially including uniformity of layer thickness and width. The apparatus includes a feedblock which selectively splits the coextruded streams, controls |
| 4028034 |
Method and apparatus for blow molding plastic |
June 7, 1977 |
| The invention disclosed is for a method and apparatus 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. Desirab |
| 3939236 |
Method for blow molding foamed walled plastic open mouthed containers |
February 17, 1976 |
| 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 |
