Pretreatment Or Preparation Of Charge Material Patents (Class 264/328.17)
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Publication number: 20030051851Abstract: A molten material supply unit includes a heating cylinder. The heating cylinder may receive and heat the material in a substantially vacuum condition. A molding apparatus may include a pressurizing and charging unit in addition to the molten material supply unit. The pressurizing and charging unit is adapted to receive the melted material from the molten material supply unit and to charge the melted material into a die under pressure.Type: ApplicationFiled: September 17, 2001Publication date: March 20, 2003Inventor: Fujio Yamada
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Publication number: 20030034577Abstract: An injection molding machine includes a plasticating unit for plasticating a thermoplastic resin, and an injecting unit connected to the plasticating unit through a connecting passage to inject the plasticated resin into a mold. The injecting unit A includes a rotary pump having a suction port connected to the plasticating unit through the connecting passage and a discharge port connected to the mold. The plasticated resin is intermittently injected into the cavity of the mold through the injection port by means of the rotary pump. In the connecting passage, an accumulator is provided which reserves the resin plasticated in the plasticating unit in an amount equal to or more than the shot capacity, and feeds the resin to the rotary pump.Type: ApplicationFiled: September 30, 2002Publication date: February 20, 2003Inventors: Kunihito Seta, Takeshi Takeda
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Patent number: 6521164Abstract: A thermoplastic polyurethane (TPU) elastomer and p-phenylene diisocyanate (PPDI)/polycaprolactone-based composition therefor having a unique chain extender combination for improved injection moldability. The elastomer is formed as the reaction product of: (A) from about 60 to 80% by weight of a hydroxyl-terminated poly(caprolactone) diol; (B) from about 17 to 22% by weight of a p-phenylene diisocyanate; (C) from about 3 to 10% by weight of a first hydroxyl-functional chain extender; and (D) less than about 2% by weight of a second hydroxyl-functional chain extender different from the first chain extender, the second chain extender being selected as effective to modify the crystallinity of the elastomer.Type: GrantFiled: December 23, 1996Date of Patent: February 18, 2003Assignee: Parker-Hannifin CorporationInventors: Thomas L. Plummer, Val C. Comes, George R. Wallace
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Patent number: 6511757Abstract: A system of compression molding a synthetic wood formulation into a commercially useable synthetic wood component is described. Surprising results are achieved when the dry formulation is placed under heat and pressure. Many different components may be made using the present invention, such as by example, wood-like trim components for the housing construction industry.Type: GrantFiled: November 14, 2000Date of Patent: January 28, 2003Assignee: Crane Plastics Company LLCInventors: Jeffrey R. Brandt, Burch E. Zehner
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Publication number: 20030008400Abstract: There is disclosed a process for melting a luminescent oxygen sensitive compound into extruded polymer films. Specifically, there is disclosed a process for thermal melting of oxygen-sensitive indicators into common packaging polymers used for commercial packaging of products, such as foods. The oxygen-sensitive indicators can be used for real-time monitoring of oxygen in commercial packaging operations.Type: ApplicationFiled: June 25, 2001Publication date: January 9, 2003Inventors: David L. Putnam, Todd Hubbard
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Publication number: 20030001303Abstract: This invention has as its object to provide a method of supplying a resin material to an injection molder with which cells can be uniformly dispersed in a molded product. In order to achieve this object, the method includes the absorbing step of placing a resin material in a pressurized inert gas in a pressure vessel and allowing the resin material to absorb the inert gas, and the supplying step of supplying the resin material which has absorbed the inert gas to an injection molder.Type: ApplicationFiled: June 26, 2002Publication date: January 2, 2003Applicant: Canon Kabushiki KaishaInventor: Takashi Arai
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Publication number: 20020180090Abstract: A module for a modular conveyor belt, is described. The module is of a sandwich layer construction having a core polymeric material completely surrounded by a skin polymeric material. The skin material includes an antimicrobial material for inhibiting bacterial growth on the module, and the conveyor belt is particularly useful for conveying and transporting foods including food processing and food handling applications.Type: ApplicationFiled: May 29, 2001Publication date: December 5, 2002Inventors: Luis Cediel, Claudia Susanne Honold
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Publication number: 20020175447Abstract: A method of reducing the restrictions of mixing fiber reinforced plastic includes the step of first coating the fiber. The coating is of a sort which will prevent the fiber from beginning to absorb the plastic such that the combined plastic and fiber may be stored for a period of time. Once the combined fiber and plastic are moved towards a mold, a mix station preferably cracks the coating. This allows the fiber to absorb the plastic matrix. The combined fiber and plastic is then delivered into a mold. By allowing the fiber to be pre-mixed with the plastic, the requirement of a “mix room” for mixing fiber into a plastic matrix adjacent to a molding facility is eliminated.Type: ApplicationFiled: May 23, 2001Publication date: November 28, 2002Inventor: Gerard Jay Bellasalma
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Patent number: 6464923Abstract: A method for producing a molded silicone rubber product comprising (i) forming a mixture comprising (A) a primary composition in the form of a paste comprising an inorganic filler and a diorganopolysiloxane containing at least 2 silicon atom-bonded alkenyl groups per molecule, (B) a liquid catalyst composition comprising a platinum catalyst and an organopolysiloxane containing at least 2 silicon atom-bonded alkenyl groups per molecule, and (C) a liquid curing composition comprising an organopolysiloxane having at least 2 silicon atom-bonded hydrogen atoms per molecule and an organopolysiloxane having at least 2 silicon atom-bonded alkenyl groups per molecule; (ii) feeding the mixture comprising components (A), (B), and (C) into a molding device; and (iii) curing the mixture comprising components (A), (B), and (C) by heating.Type: GrantFiled: February 22, 2001Date of Patent: October 15, 2002Assignee: Dow Corning Tory Silicone Co., Ltd.Inventors: Yuichi Tsuji, Akito Nakamura
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Patent number: 6447711Abstract: Polyester resins particularly suitable for extrusion and injection blow-molding contain from 20 to 1000 ppm of a dianhydride of an aromatic tetracarboxylic acid and show values of die swell less than 45%. The resins are obtained by solid state polycondensation of resin having intrinsic viscosity less than 0.7 dl/g, added with a dianhydride of an aromatic tetracarboxylic acid in amount between 0.02 and less than 0.05% by weight.Type: GrantFiled: July 3, 1996Date of Patent: September 10, 2002Assignee: Sinco Engineering, S.p.A.Inventors: Hussain Ali Kashif Al Ghatta, Arianna Giovannini, Sandro Cobror
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Patent number: 6419869Abstract: A method of producing an injection molded part in which an insert is disposed within a mold cavity and extrusion coated with a plastic material fed via injection cylinder by layering at least one hard component and at least one soft component of a plastic material within the injection cylinder and then successively feeding the hard component followed by the soft component out of the injection cylinder into the mold cavity to extrusion coat the insert.Type: GrantFiled: November 20, 1998Date of Patent: July 16, 2002Assignee: Eldra Kunststofftechnik GmbHInventors: Klaus Gotterbauer, Stefan Könsgen
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Patent number: 6416211Abstract: An apparatus for molding plastic including: (a) an injection space; (b) forming apparatus for supplying plastic material to the injection space, the forming apparatus having at least an inner conical stator and an outer conical stator and at least one rotatable rotor disposed outside of the inner conical stator; and (c) a piston for compressing the plastic material supplied to the injection space into a mold to form the plastic material into a shape determined by the mold.Type: GrantFiled: January 19, 1999Date of Patent: July 9, 2002Assignee: Conenor OyInventors: Kari Kirjavainen, Jyri Järvenkylä
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Publication number: 20020074683Abstract: A process for making a shaped product from thermoplastic polycarbonate is disclosed. The process comprises producing polycarbonate melt by a method selected from the group consisting of phase interface and melt transesterification and introducing the melt directly into a forming apparatus to form a shaped product. The forming apparatus is selected from the group consisting of an injection molding machine and an extruder. The process is characterized in the absence therefrom of polycarbonate in granular form.Type: ApplicationFiled: August 20, 2001Publication date: June 20, 2002Inventors: Christoph Schwemler, Thomas Elsner, Jurgen Heuser, Christian Kords
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Publication number: 20020074678Abstract: A device and method for cooling granules, in particular wax granules, for processing in an injection-moulding machine, which has a cavity for receiving the granules and having an inlet opening and an outlet opening, and at least one further opening is provided for supplying a gaseous medium. In the device of the invention, the outlet opening is arranged directly or indirectly at the feed region of the screw of an injection-moulding machine and the cavity is connected to a cold-gas production device. In the process of the invention, the inlet temperature and the outlet temperature of the gas is determined and by determining the temperature difference, the preset theoretical temperature in the cavity is controlled and/or regulated.Type: ApplicationFiled: August 15, 2001Publication date: June 20, 2002Applicant: Battenfeld GmbHInventors: Harald Bleier, Andreas Huber
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Patent number: 6379795Abstract: A method for making a shaped article or a shaped article having a volume resistivity of less than 102 ohm-cm with a desired combination of properties and processibility in an injection moldable composition. In particular the shaped articles formed include injection molded bipolar plates as current collectors in fuel cell applications.Type: GrantFiled: January 7, 2000Date of Patent: April 30, 2002Assignee: E. I. du Pont de Nemours and CompanyInventors: Mukesh K. Bisaria, Peter Andrin, Mohamed Abdou, Yuqi Cai
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Patent number: 6365076Abstract: A technique for fabricating an improved electronic enclosure. The electronic enclosure is made of graphite fibers dispersed directionally (non-homogeneous) in an absolac/polycarbonate (ABS/PC) resin mix, which the composition is molded to form the plastic enclosure. The graphite concentration is highest along the interior surface of the enclosure to provide improved heat transfer, as well as adequate EMI/RFI shielding. However, the graphite concentration decrease along the thickness, wherein at the outer surface, the graphite concentration level is zero. The directional variation in the graphite loading allows high graphite loading at the interior surface of the enclosure, but retains lower loading at other regions along the thickness so that rigidity and impact resistance are retained for the enclosure.Type: GrantFiled: June 5, 2000Date of Patent: April 2, 2002Assignee: Intel CorporationInventor: Rakesh Bhatia
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Publication number: 20020033550Abstract: An object of the invention is to provide a method and an apparatus for recycling plastics which is improved with respect to operation efficiency, operation environment, lowering degradation of plastics, recycling cost and environment load including saving energy. The recycling is made as follows: coarse-crushing used-up plastic products, separating plastic materials from other foreign matters by air blow separation, fine-crushing the separated plastics, washing the fine-crushed plastics by the process using a circulation flow including a spiral flow in which interaction between crushed plastics helps themselves clean without washing agents, dewatering the washed plastics, drying them, removing metallic matters by using metal detector, then feeding them directly without pelletizing to an injection molding machine of which nozzle part is equipped with filter and flow-switching mechanism for cleaning the filter by backwash reverse filtration.Type: ApplicationFiled: September 19, 2001Publication date: March 21, 2002Applicant: FUJI PHOTO FILM CO., LTD.Inventor: Kazuyoshi Suehara
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Patent number: 6352667Abstract: A method of making a biodegradable polymeric implant comprising the steps of aseptically mixing at least one monomer with at least one catalyst to form a polymerization mixture, injecting the polymerization mixture into a sterile mold, and polymerizing and/or cross-linking the polymerization mixture in the sterile mold to form a sterilized biodegradable polymeric implant. Additives may be included in the polymerization mixture as needed.Type: GrantFiled: August 24, 1999Date of Patent: March 5, 2002Assignee: Absorbable Polymer Technologies, Inc.Inventor: James P. English
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Publication number: 20010040320Abstract: The present invention provides a method of molding a polyolefin-based resin comprising the steps of dissolving at least one dibenzylidene sorbitol compound in a molten polyolefin resin, cooling the molten resin to a temperature not higher than the sol-gel transition temperature during the cooling cycle to form network-like crystals of the dibenzylidene sorbitol compound, and molding the resulting resin composition at a temperature not lower than the melting temperature of the polyolefin-based resin but not higher than the sol-gel transition temperature during the heating cycle; and a polyolefin resin molded article obtainable by this molding method.Type: ApplicationFiled: March 28, 2001Publication date: November 15, 2001Inventors: Toshiaki Kobayashi, Kiyoshi Sadamitsu
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Patent number: 6312631Abstract: A polyolefin composition having enhanced dyeing capabilities containing: (a) a polyolefin; (b) from 0.01 to 10% by weight, based on the weight of the polyolefin in, of a migratable amphiphile, excluding phenolic and sulfur-containing stabilizers and n-octyl phenyl salicylate; and (c) from 0.01 to 1000 ppm of a transition metal, based on the weight of the polyolefin.Type: GrantFiled: January 13, 2000Date of Patent: November 6, 2001Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Norbert Bialas, Paul Birnbrich, Herbert Fischer, Joerg-Dieter Klamann, Raymond Mathis
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Publication number: 20010035596Abstract: In a process for increasing the elongation at break of moldings made from thermoplastic molding compositions comprising, based on the total of the amounts of components A and B and, where appropriate, C and/or D, the entirety of which gives 100% by weight,Type: ApplicationFiled: April 5, 2001Publication date: November 1, 2001Inventors: Sabine Oepen, Michael Breulmann, Norbert Guntherberg, Wil Duijzings, Norbert Niessner, Roelof Marissen
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Patent number: 6306322Abstract: The invention concerns a method and device for filling at least one casting mould (10) with a castable, liquid compound, in particular casting resin. In order to decrease the mould-occupation time considerably, the reactivity of the casting compound is firstly increased at least during the filling phase for the at least one casting mould (10) by the supply of energy and is then decreased by the removal of energy to a value at which the casting compound has a relatively long service life. Heat exchanges (7) are proposed as means for heating and, if necessary, cooling the casting compound.Type: GrantFiled: September 17, 1996Date of Patent: October 23, 2001Assignee: Wilhelm Hedrich Vakuumanlagen GmbH & Co. KGInventors: Erhard Hauser, Wilhelm Hedrich
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Patent number: 6303069Abstract: A process for the production of moldings from a polymer alloy of multiphase morphology, in which the polymer alloy is prepared with the injection molding in one process step. For this, thermoplastically processable polymers which are incompatible or not very compatible with one another are introduced as granules, preferably having a particle size of greater than or equal to 3 mm, into the hopper of an injection molding machine and are subsequently plasticized, mixed thoroughly, and shaped in the injection molding machine; where at least one of the polymers employed is capable chemically, under the injection molding conditions, of association and/or copolymerization with at least one other of the participating polymers. The resulting polymer alloys are not inferior in their properties to corresponding conventionally produced alloys. The moldings are useful in orthopedics.Type: GrantFiled: November 6, 1997Date of Patent: October 16, 2001Assignee: Otto Bock Orthopaedische Industrie Besitz-Und Verwaltungs-KommanditgesellschaftInventors: Klaus-Peter Anhalt, Jürgen Deinert
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Patent number: 6284170Abstract: The present invention is applicable to an injection molding machine comprising an injection device having a servo motor for use in rotating a screw and a controller for controlling the servo motor. The controller has a rotation speed N previously set therein as a set value for the screw rotation in a metering process. The controller rotates the screw at an acceleration A1 until the rotation speed of the screw reaches a value NK (where NK<N). After that the controller carries out a control operation to rotate the screw at an acceleration A2 until the rotation speed of the screw reaches the value N. The acceleration A2 is higher than the acceleration A1.Type: GrantFiled: June 16, 1999Date of Patent: September 4, 2001Assignee: Sumitomo Heavy Industries Ltd.Inventor: Kazuo Hiraoka
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Publication number: 20010016566Abstract: A process for forming detergent bars by injection moulding in which a pressure is applied to a partially structured detergent composition to deliver it to a mould. The detergent composition can be delivered to the mould in a substantially semi-solid state, at a temperature below 70° C. and at a pressure at the point of injection of greater than 20 psi. Apparatus for forming detergent bars according the invention are also described.Type: ApplicationFiled: February 28, 2001Publication date: August 23, 2001Applicant: Lever Brothers Company, Division of Conopco, IncInventors: Peter Stewart Allan, John Martin Cordell, Graeme Neil Irving, Suresh Murigeppa Nadakatti, Vijay Mukund Naik, Christine Ann Overton, Frederick Edmund Stocker, Karnik Tarverdi, John Colin Wahlers
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Publication number: 20010011067Abstract: A process for forming detergent bars by injection molding in which a pressure is applied to a partially structured detergent composition to deliver it to a mold. The detergent composition can be delivered to the mold in a substantially semi-solid state, at a temperature below 70° C. and at a pressure at the point of injection of greater than 20 psi. Apparatus for forming detergent bars according the invention are also described.Type: ApplicationFiled: February 28, 2001Publication date: August 2, 2001Inventors: Peter Stewart Allan, John Martin Cordell, Graeme Neil Irving, Suresh Murigeppa Nadakatti, Vijay Mukund Naik, Christine Ann Overton, Frederick Edmund Stocker, Karnik Tarverdi, John Colin Wahlers
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Publication number: 20010009309Abstract: A manufacturing method for providing a cement bonded wood chip product, a resin bonded wood chip product and a simulated wood product, in which recycled wooden members and recycled resinous members are pulverized after having been mixed. Accordingly, a mixing process and a pulverizing process can be integrated into one single line, reducing the space as well as laborious work and efficient operation in a plant.Type: ApplicationFiled: March 7, 2001Publication date: July 26, 2001Applicant: Misawa Homes Co., Ltd.Inventors: Hidenori Taguchi, Keishiro Umemura
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Patent number: 6238615Abstract: The present invention provides method of molding a polyolefin-based resin comprising the steps of dissolving at least one dibenzylidene sorbitol compound in a molten polyolefin resin, cooling the molten resin to a temperature not higher than the sol-gel transition temperature during the cooling cycle to form network-like crystals of the dibenzylidene sorbitol compound, and molding the resulting resin composition at a temperature not lower than the melting temperature of the polyolefin-based resin but not higher than the sol-gel transition temperature during the heating cycle; and a polyolefin resin molded article obtainable by this molding method.Type: GrantFiled: July 6, 1999Date of Patent: May 29, 2001Assignee: New Japan Chemical Co., Ltd.Inventors: Toshiaki Kobayashi, Kiyoshi Sadamitsu
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Patent number: 6235070Abstract: The invention relates to a rigid sand body consisting of a plurality of sand grains adhering to one another and provided with a coating consisting of wax, wherein the sand body is abradable, as well as to a process for its preparation, which is characterized in that sand grains and wax are heated separately from one another at a temperature of 50-90° C., the heated sand grains and the heated, liquid wax are added together and the composition obtained is allowed to cool for solidification. The sand bodies of the invention are particularly suitable as a sand scrub for skin massage or as a modelling or model component. The invention also relates to a process for producing discrete agglomerated sand grains provided with a coating having burls consisting of wax by abrading the sand body of the invention. The resulting abration sand comprising sand grains surrounded by wax are very well suited as sliding and slipping bases.Type: GrantFiled: December 9, 1999Date of Patent: May 22, 2001Inventor: Norbert Beermann
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Patent number: 6228308Abstract: A screw adapted for plasticizing a fiber-reinforced thermoplastic resin wherein screw lead (distance of the resin advancement in the direction of the axis per 1 revolution of the screw when it is postulated that the screw channel is 100% filled with the resin) of the screw in its compression section decreases in the direction toward the forward end of the screw. A plasticizing apparatus wherein such screw is mounted. A method for molding a fiber-reinforced thermoplastic resin by using such an apparatus. A molded article produced by such molding method. In the present invention, shear force of sufficient level can be obtained to avoid the formation of clumps while breakage of the reinforcing fibers is avoided to leave long fibers in the molded article. The resulting molded article has excellent mechanical properties, and such article is quite useful as a material for use in automobile parts and other parts.Type: GrantFiled: January 20, 1999Date of Patent: May 8, 2001Assignees: Kawasaki Steel Corporation, Hitachi Metals, Ltd.Inventors: Kenichi Uehara, Shigeru Takano, Yoshikazu Asano, Masanori Amano
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Patent number: 6228301Abstract: A manufacturing method of a simulated wood product utilizing pulverized powders obtained from recycled building members as raw material, in which the building members have recycled wooden members made of wooden materials and resinous members made of resinous materials, the manufacturing method further including a mixing process for mixing the recycled wooden members, a pulverization process for pulverizing the mixed materials obtained in the mixing process to form pulverized powder, a kneading process for kneading the pulverized powders obtained by the pulverizing process, and a molding process for molding the kneaded materials obtained in the kneading process either by an extrusion or injection molding.Type: GrantFiled: April 9, 1999Date of Patent: May 8, 2001Assignee: Misawa Homes Co., Ltd.Inventors: Hidenori Taguchi, Keishiro Umemura
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Patent number: 6228310Abstract: This thermoplastic composition and process for making articles of the same includes a thermoplastic matrix that includes a resin and filler materials wherein the filler materials includes a combination of fibers, at least one lubricant, and thermally conductive material, for improving tribological performance of thermoplastic materials. In the alternative, a thermally conductive lubricant may be substituted for the combination of the lubricant and the thermally conductive material.Type: GrantFiled: May 14, 1999Date of Patent: May 8, 2001Assignee: Caterpillar Inc.Inventor: Kristy J. Johnson
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Patent number: 6224812Abstract: A process for forming detergent bars by injection moulding in which a pressure is applied to a partially structured detergent composition to deliver it to a mould. The detergent composition can be delivered to the mould in a substantially semi-solid state, at a temperature below 70° C. and at a pressure at the point of injection of greater than 20 psi.Type: GrantFiled: May 14, 1998Date of Patent: May 1, 2001Assignee: Lever Brothers Company, division of Conopco, Inc.Inventors: Peter Stewart Allan, John Martin Cordell, Graeme Neil Irving, Suresh Murigeppa Nadakatti, Vijay Mukund Naik, Christine Ann Overton, Frederick Edmund Stocker, Karnik Tarverdi, John Colin Wahlers
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Publication number: 20010000417Abstract: The invention discloses a method by which a fluid heat reactive resin system is formulated below the melting point of the resin. This permits the application of coatings and the formation of shapes and powders from the fluid heat reactive system. Liquefied gases are used to solvate resins so that curing agents, hardeners, pigments and flow control agents, and especially curing agents which are too reactive to be mixed with the resins above the melting point of the resins may be dispersed in the resins.Type: ApplicationFiled: November 30, 2000Publication date: April 26, 2001Inventor: Douglas S. Richart
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Patent number: 6203747Abstract: An injection molding machine includes an injection molding cylinder with a material supply at one end and an injection nozzle at the other end and a material conveyance unit attached to a drive and movable in the injection molding cylinder. The injection molding machine also includes a vibration element for inducing a flow of melt within the injection molding cylinder for homogenizing the melt.Type: GrantFiled: January 20, 1999Date of Patent: March 20, 2001Assignee: Mannesmann AGInventor: Otto Grunitz
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Patent number: 6190601Abstract: A method for controlling a screw injecting apparatus having a heating cylinder and a screw slidably and rotatably received in the heating cylinder and designed to carry out a plasticizing-metering phase in which a predetermined amount of a molten material is accumulated forwardly of the screw by plasticizing and kneading a raw molding material via the screw and the heating cylinder, a waiting phase in which the screw is held inactive for a period between completion of the metering and subsequent injection of the molten material, and an injecting phase in which the molten material is injected. The method comprises the step of causing the apparatus to vibrate the molten material at a predetermined low frequency axially of the screw during the plasticizing-metering phase. By vibrating the molten material at a low frequency during the relatively long plasticizing-metering phase, the viscosity of the molten material can be reduced.Type: GrantFiled: December 3, 1998Date of Patent: February 20, 2001Assignee: Nissei Plastic Industrial Co.Inventor: Nobuyuki Nakamura
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Patent number: 6187229Abstract: An injection molding process wherein the times of heating to melt a resin are reduced to minimize the thermal hysteresis and to decrease the deterioration of physical properties caused by the thermal hysteresis, so that high quality information recording disks may be produced. A molding process wherein the plasticating and the injection and filling of a material resin are carried out in separate cylinders, allows constant molding for a long period of time. A material resin such as polycarbonate is supplied without predrying to an injection apparatus for a first time molding. Resin is kneaded by the apparatus while volatile components are heated to be vaporized and exhausted through a vent port. An inert gas atmosphere is provided within the cylinder to prevent the material resin from being oxidized. Since predrying can be dispensed with, the thermal hysteresis will be extremely small and the deterioration of the resin caused by such heating may be suppressed.Type: GrantFiled: June 19, 1998Date of Patent: February 13, 2001Assignee: Nissei Plastic Industrial Co., Ltd.Inventors: Kazutoshi Takayama, Kiyoto Takizawa
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Patent number: 6180257Abstract: A system of compression molding a synthetic wood formulation into a commercially useable synthetic wood component is described. Surprising results are achieved when the dry formulation is placed under heat and pressure. Many different components may be made using the present invention, such as by example, wood-like trim components for the housing construction industry.Type: GrantFiled: October 29, 1996Date of Patent: January 30, 2001Assignee: Crane Plastics Company Limited PartnershipInventors: Jeffrey R. Brandt, Burch E. Zehner