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| Number | Title | Issue Date |
| 7329037 | Plasticating screw for an extruder or extrusion press, having a narrower land width in the transition region A plasticating screw for an extruder or an extrusion press has a thread change, whereby the volume of the transporting cross-section does not change and thus a pressure increase in the region of the thread is avoided. To this end, in the region wherein a first and a... | 02/12/2008 |
| 7255472 | Mixing device with mixing ring having offset channels with spaced baffles A device comprising a shaft, a front ring connected to this shaft, an end ring connected to the shaft at a distance A from the front ring, and a loose mixing ring, which is freely rotatable and located between the front ring and the end ring. The mixing ring has a f... | 08/14/2007 |
| 7192178 | Extrusion auger with removable auger segments and removal tool There is provided an extrusion auger having auger segments that are removable from an auger shaft and that include a recess to facilitate removal of the auger segments. A pulling tool is also provided to engage the recess of the auger segment and to facilitate the r... | 03/20/2007 |
| 7156550 | Apparatus for plasticating thermoplastic resin including polypropylene Apparatus according to this invention for plasticating a resin polymer, especially polypropylene, includes a barrel having an inlet, outlet, and inner surface. A screw, located within and closely spaced from the inner surface of the barrel, has a longitudinal axis e... | 01/02/2007 |
| 7150615 | Molding machine for injection foaming A process for injection-foaming a thermoplastic resin by using an injection molding machine with a two-stage-compression screw, injecting a physical foaming agent into the cylinder of the machine at a pressure lower than the storage pressure of the physical foaming ... | 12/19/2006 |
| 7101165 | Extrusion molding apparatus for ceramic molded product An extrusion molding apparatus comprises a shaping die for producing a ceramic molded product, and a screw extruder having built therein an extruding screw (40) for mixing while leading a ceramic material forward. The extruding screw (40) includes a pr... | 09/05/2006 |
| 7101166 | Apparatus for extruding ceramic molding The extruding apparatus has the molding die to form the ceramic molding, the screw extruder containing the extrusion screw to knead and guide the ceramic material toward the molding die. The extrusion screw is comprised of the pressure screw part and the diffusion s... | 09/05/2006 |
| 7036974 | Mixing device for extruders A mixing device comprises a cylindrical body (14) to be terminally engaged with an extrusion screw (2) and carrying at least one primary mixing thread (15) and at least one secondary mixing thread (16) having a crest diameter (d3 | 05/02/2006 |
| 7029263 | Injection molding device with intermediate storage space An injection molding device includes a continuously operating extruder and a discontinuously operating injection unit receiving plastic material from the extruder. The extruder has an extruder barrel which includes a plasticizing zone and a discharge zone, whereby t... | 04/18/2006 |
| 7014353 | Plasticating screw and apparatus A rotatable screw for moving material in a plasticating process along an axis through a conduit from an inlet to an outlet. The screw having a feed section, barrier melting section, reorientation section and metering section disposed sequentially downstream. The scr... | 03/21/2006 |
| 7008202 | Method and apparatus for forming thermoplastic resin foam The present invention relates to the step of plasticizing a thermoplastic resin material by rotatably driving a screw (20). Also included in the method is the step of injecting an inert gas into a screw cylinder (1) to permeate the melted resin and inj... | 03/07/2006 |
| 6988821 | Plastics screw with barrier members A screw rotates in a containment barrel, and comprises a shaft having an upstream end and a downstream end At least one flight is secured to the surface of the shaft and extends helically in successive turns around the circumference of the shaft. An upstream barrier... | 01/24/2006 |
| 6974243 | Screw element for same-sense rotating multi-screw extruders A screw element includes an outer radius Ra and a core radius Ri for multiscrew extruders with co-rotating and intermeshing screw shafts. The screw element has in axial cross section through its longitudinal axis a profile which has at each of ... | 12/13/2005 |
| 6921191 | Injection/extruder screw The present invention concerns a screw for moving plastic through a barrel in a direction of flow from a drive to a tip. The screw has a shaft having opposing first and second ends, a drive located on the first end of the shaft, a tip located on the second end of th... | 07/26/2005 |
| 6887062 | Extruder screw tip and associated flow channel A screw nose for a rubber extruder screw has an upstream portion of increasing diameter providing working engagement of the rubber flowing from the screw with the extruder barrel and a downstream portion of decreasing diameter providing working engagement of the rub... | 05/03/2005 |
| 6854873 | Extruder for processing rubber mixtures The invention relates to an extruder for the preparation of rubber mixtures for elastomeric products and comprises a cylinder, an endless screw rotatably mounted in the cylinder for uptake transport and homogenization of the rubber mixture, and an extrusion tool; wh... | 02/15/2005 |
| 6790025 | Extrusion molding apparatus An extrusion molding apparatus capable of improving the extrusion rate of the ceramic material without a major reconstruction of a drive system is disclosed. The extrusion molding apparatus comprises screw extruders (2, 3) including housings (29, 39) h... | 09/14/2004 |
| 6726464 | Mixing device for manufacturing molding An apparatus for manufacturing moldings by which clear colors and patterns can be brought out without a remarkable lowering of strength. Immediately before delivery to a metal mold, outer resin material positioned on the main cylinder inner wall side is put in the m... | 04/27/2004 |
| 6705753 | Extruder comprising blister mechanism An extruder for polymer melts, with an extrusion space arranged in an extruder barrel and through which at least one extruder screw shank extends so that it can be rotated by a motor. The screw shank has at least one section in the form of a cylinder casing, the ext... | 03/16/2004 |
| 6672753 | Apparatus for plasticating thermoplastics A plasticating screw having a feed section, barrier melting section, reorientation section and metering section disposed sequentially downstream wherein solid material is moved from a trail side of a main flight to a push side of the main flight in the re... | 01/06/2004 |
| 6672752 | Extrusion apparatus with winding socket An extrusion apparatus is provided having an extrusion worm with a threaded exterior passage and rotatably driven by a drive shaft operatively couplable with a drive motor for driving rotation of the drive shaft. A feed in device feeds to the extrusion ap... | 01/06/2004 |
| 6652254 | Molding apparatus including screw for molded articles of thermoplastic gas impregnated resin The invention provides a molding apparatus adapted to use a screw having an overall length permitting the use of an existing molding machine cylinder as it is, and is capable of realizing a gas impregnation step. The screw 3 for use in the gas impregnatio... | 11/25/2003 |
| 6609819 | Twin screw extruder with conical non-parallel converging screws An improved twin screw extruder device (14) is provided which is capable of producing a wide variety of high quality extrudates having greatly varying final properties, without the need for extensive machine modifications. The extruder (14) includes a bar... | 08/26/2003 |
| 6607299 | Apparatus for removing debris from thermoplastic materials An apparatus for filtering thermoplastic synthetic plastic material has a screw (5) bearingly supported within a housing (1) for rotation around its longitudinal axis for the transport and preferably also plasticizing of the synthethic plastic material. T... | 08/19/2003 |
| 6599004 | Extruder screw with improved energy efficient melting An extruder screw includes an energy transfer section divided into successive barrier sections in which a channel formed by a first thread is divided into at least two sub-channels by a second thread. A ratio of the difference in outer diameters of the th... | 07/29/2003 |
| 6513963 | Multi-staged vented extrusion screw with dual channel depth pumping section A vented, multi-staged rotary screw extruder is taught for extruding thermoplastic materials. The screw has a final pumping-section of the screw that includes two or more channel depths which provides exit-pressure and flow stability. The channel-depth of... | 02/04/2003 |
| 6454454 | Polymer melting and extruding apparatus with linear downstream threads An extruder screw mechanism has a barrel that is heated by heating coils, an internal screw, and a cylindrical melt sleeve having a plurality of circumferentially spaced, axially extending, radial slots there through located between the external barrel an... | 09/24/2002 |
| 6345976 | Injection apparatus There is provided an injection apparatus comprised of a heating cylinder which is closed by a front end member having a nozzle. The apparatus is further comprised of a plasticating screw in the heating cylinder in a freely rotating and reciprocating manne... | 02/12/2002 |
| 6331069 | Concrete extrusion machine and spiral conveyor therefor A spiral conveyor for a concrete extrusion machine has a first spiral conveyor section with a first external diameter. There is a second spiral conveyor section having a second external diameter which is greater than the first diameter. The second section... | 12/18/2001 |
| 6312148 | Removal of gaseous phase from continuous mixing chamber for rubber compound A continuous mixing apparatus and process for preparing a rubber compound in an elongated mixing chamber defined by the volume between a radially inner surface of a stator and a radially outer surface of a rotor, the constituents being such that their mix... | 11/06/2001 |
| 6293690 | Vented single stage barrier screw with a gas vent hole and axial bore in the screw for venting gases A barrel contains an extruder conveying screw which has a drive end, a feed section, a melting section and a pumping section wherein the screw has a vent hole located from 0 to 2 screw diameters from the beginning of the feed section. An axial bore in the... | 09/25/2001 |
| 6247836 | Injection screw for injection molding a preform of a polyester resin When a desired preform is to be molded from a molding material which is a polyester resin composed of a blend of PET and PEN by compressing and melting the molding material by the rotation of a screw in a heating cylinder and injecting and filling the mol... | 06/19/2001 |
| 6234659 | Surge suppressor for vented injection molding machine screw A plasticating apparatus adapted to handle a wide variety of synthetic resinous materials without predrying. The plasticating apparatus includes a two-stage screw rotatably and reciprocably mounted within a barrel. A surge suppressor is provided between t... | 05/22/2001 |
| 6227692 | Double wave screw A plasticating screw having improved mixing capability for polymer blends comprises a feed zone having a helical flight defining a solid material feed path, a compression zone for converting the solid material into molten material having a helical channel... | 05/08/2001 |
| 6179461 | Extruder screw An axially elongated extruder screw includes a screw body having an axially extending extruding portion defined by a feed section at an inlet end of the screw, a metering section at an outlet end of the screw and a barrier section between the feed and met... | 01/30/2001 |
| 6176606 | Extruder screw An axially elongated extruder screw includes a screw body having an axially extending extruding portion defined by a feed section at an inlet end of the screw, a metering section at an outlet end of the screw and a barrier section between the feed and met... | 01/23/2001 |
| 6139179 | Extruder screw having multi-channeled barrier section An axially elongated extruder screw includes a screw body having an axially extending extruding portion defined by a feed section at an inlet end of the screw, a metering section at an outlet end of the screw and a barrier section between the feed and met... | 10/31/2000 |
| 6136246 | Screw extruder with improved dispersive mixing elements A screw extruder (10) having a barrel (18) which has a bore (26) defining an inner surface (44) and one or more extruder screws (28), positioned within the bore (26). The extruder screw or screws (28) include a central shaft (34) and one or more screw fli... | 10/24/2000 |
| 6132075 | Multichannel wave screw with a slush channel barrier section A multichannel wave screw with a slush channel barrier section adapted to provide a consistent mixture of 50% solids and 50% melt to both channels of the double wave metering section. The screw includes a barrier flight having a relatively large initial c... | 10/17/2000 |
| 6129873 | Process for removing moisture and volatiles from pellets in single screw extruders In a process for extruding a thermoplastic resin in a single screw extruder, a barrel of a single screw extruder has a channel, a feed section and a first melt seal located after the feed section. The process is improved by supplying solid polymer into th... | 10/10/2000 |
