Patents by Inventor Munehiro Nobuta

Munehiro Nobuta has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10926436
    Abstract: Provided is an injection molding method for resin that contains reinforcing fiber, the method being capable of easily eliminating uneven distribution of added components. The injection molding method is provided with: a plasticizing step for supplying resin pellets P and added components to a cylinder equipped with a screw 10, which has a rotating axis as the center is capable of rotating normally and in reverse, and generating molten resin by rotating the screw 10 in the normal direction; and an injecting step for injecting the molten resin M comprising the added components into a cavity. In the plasticizing step, a reverse rotation operation for reversing the rotation of the screw 10 is performed or a screw-stopping operation of stopping the normal rotation of the screw 10 is performed with a prescribed timing and for a prescribed period.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: February 23, 2021
    Assignees: UBE MACHINERY CORPORATION, LTD., MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Munehiro Nobuta, Naoki Toda, Toshihiko Kariya, Takeshi Yamaguchi, Kiyoshi Kinoshita
  • Patent number: 10766178
    Abstract: Provided is a screw that is for use in an injection molding machine and that makes it possible to benefit from the kneading effect of a multi-start screw while minimizing the received friction resistance. The screw for an injection molding machine is provided with a first stage 20 on the upstream side and a second stage 30 on the downstream side. The screw for an injection molding machine is characterized in that: the first stage 20 is provided with a compression section 22 comprising a main scraper 25 and an auxiliary scraper 26 having a smaller outer diameter than the main scraper 25; and the second stage 30 is provided with a multi-start screw section 31, said multi-start screw section being provided on the upstream side and comprising a plurality of scrapers, and a fin kneading section 32 provided downstream from the multi-start screw section.
    Type: Grant
    Filed: January 15, 2015
    Date of Patent: September 8, 2020
    Assignees: U-MHI PLATECH CO., LTD., MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Munehiro Nobuta, Naoki Toda, Toshihiko Kariya, Takeshi Yamaguchi, Kiyoshi Kinoshita
  • Patent number: 10486351
    Abstract: There is provided a screw of an injection molding machine that can eliminate uneven distribution of reinforcing fibers without giving an excessive shear force to the reinforcing fibers. A screw is provided inside a heating cylinder of an injection molding machine to which a resin pellet is fed on an upstream side in a conveyance direction of resin and to which reinforcing fibers are fed on a downstream side therein, and includes: a first stage at which the resin pellet which is fed is melted; and a second stage that continues to the first stage, and at which molten resin and the reinforcing fibers are mixed with each other. A second flight provided at the second stage includes: a large-diameter flight with a relatively large outer diameter; and a small-diameter flight with a relatively small outer diameter.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: November 26, 2019
    Assignees: U-MHI PLATECH CO., LTD., MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Toshihiko Kariya, Munehiro Nobuta, Naoki Toda, Kiyoshi Kinoshita, Takeshi Yamaguchi
  • Patent number: 10464246
    Abstract: An injection molding method includes: a plasticizing process of feeding a resin pellet and additive components to a heating cylinder including a screw that can rotate around a rotation axis and can advance and retreat along the rotation axis, and generating molten resin by rotating the screw in a normal direction; and an injection process of injecting to a cavity the molten resin containing the additive components. In the plasticizing process, retreat operation of forcibly retreating the screw is performed at a predetermined velocity by a predetermined stroke or a predetermined time.
    Type: Grant
    Filed: April 20, 2015
    Date of Patent: November 5, 2019
    Assignees: U-MHI PLATECH CO., LTD., MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Munehiro Nobuta, Naoki Toda, Toshihiko Kariya, Takeshi Yamaguchi, Kiyoshi Kinoshita
  • Publication number: 20180022003
    Abstract: Provided is an injection molding method in which a constricting section is provided at a boundary between a first stage and a second stage of a screw. When a mixture of a molten resin and reinforcing fibers passes through the constricting section, compression force higher than compression force on an upstream side of the constricting section is applied to the mixture. A supply section on a downstream side of the constricting section has a shaft diameter smaller than an outer diameter of the constricting section. Therefore, the vicinity of the supply section becomes a reduced-pressure region with respect to the mixture having passed through the constricting section, and the mixture is accordingly expanded. As a result, spring-back occurs on the reinforcing fibers and a Barus effect occurs on the molten resin, thereby making it possible to produce a state that is advantageous to open the fiber bundle.
    Type: Application
    Filed: January 16, 2015
    Publication date: January 25, 2018
    Inventors: Munehiro NOBUTA, Naoki TODA, Toshihiko KARIYA, Takeshi YAMAGUCHI, Kiyoshi KINOSHITA
  • Publication number: 20170355119
    Abstract: Provided is a screw that is for use in an injection molding machine and that makes it possible to benefit from the kneading effect of a multi-start screw while minimizing the received friction resistance. The screw for an injection molding machine is provided with a first stage 20 on the upstream side and a second stage 30 on the downstream side. The screw for an injection molding machine is characterized in that: the first stage 20 is provided with a compression section 22 comprising a main scraper 25 and an auxiliary scraper 26 having a smaller outer diameter than the main scraper 25; and the second stage 30 is provided with a multi-start screw section 31, said multi-start screw section being provided on the upstream side and comprising a plurality of scrapers, and a fin kneading section 32 provided downstream from the multi-start screw section.
    Type: Application
    Filed: January 15, 2015
    Publication date: December 14, 2017
    Inventors: Munehiro NOBUTA, Naoki TODA, Toshihiko KARIYA, Takeshi YAMAGUCHI, Kiyoshi KINOSHITA
  • Patent number: 9821498
    Abstract: In an injection molding method, using a heating cylinder having on the front end thereof a discharge nozzle, a single axis screw is rotatable inside the heating cylinder, a fiber-supplying device fills reinforcing fiber into the heating cylinder, and injection molding is performed while supplying the reinforcing fiber and the resin starting material separately and supplying the reinforcing fiber on the front side of the resin starting material. The method includes a plasticization process for obtaining a specified amount of a kneaded product by retracting the screw while rotating in the normal direction to melt the resin starting material and knead reinforcing fiber into the melted resin starting material, and an injection process for discharging the kneaded product from the discharge nozzle by advancing the screw. Reinforcing fiber is supplied into the heating cylinder in the injection process.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: November 21, 2017
    Assignees: U-MHI PLATECH CO., LTD., MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Ryoji Okabe, Toshihiko Kariya, Naoki Toda, Munehiro Nobuta
  • Publication number: 20170312954
    Abstract: Provided is an injection molding method for resin that contains reinforcing fiber, the method being capable of easily eliminating uneven distribution of added components. The injection molding method is provided with: a plasticizing step for supplying resin pellets P and added components to a cylinder equipped with a screw 10, which has a rotating axis as the center is capable of rotating normally and in reverse, and generating molten resin by rotating the screw 10 in the normal direction; and an injecting step for injecting the molten resin M comprising the added components into a cavity. In the plasticizing step, a reverse rotation operation for reversing the rotation of the screw 10 is performed or a screw-stopping operation of stopping the normal rotation of the screw 10 is performed with a prescribed timing and for a prescribed period.
    Type: Application
    Filed: June 25, 2015
    Publication date: November 2, 2017
    Inventors: Munehiro NOBUTA, Naoki TODA, Toshihiko KARIYA, Takeshi YAMAGUCHI, Kiyoshi KINOSHITA
  • Patent number: 9669573
    Abstract: The injection molding apparatus of the present invention includes: a heating cylinder; a screw that is provided rotatably in an inner portion of the heating cylinder; a resin feed hopper that feeds a resin pellet; and a fiber feed device that is provided ahead of the resin feed hopper and feeds reinforcing fibers into the heating cylinder. The screw includes a first stage that is located on a rear side, and in which the resin pellet is melted, and a second stage that is located on a front side, and in which the melted resin pellet and the reinforcing fibers are mixed, and a lead of a second flight provided in the second stage is larger than a lead of a first flight provided in the first stage.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: June 6, 2017
    Assignee: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta, Kiyoshi Kinoshita, Takeshi Yamaguchi, Kosuke Ikeda, Yuji Suzumura, Hitoshi Onuma, Ryoji Okabe, Masanori Takahashi
  • Publication number: 20170015036
    Abstract: In an injection molding method of fiber reinforced resin of the present invention, a resin accumulation region is provided closer to a downstream side than an injection completion position inside a heating cylinder, an injection pressure is given to molten resin that occupies the resin accumulation region in an injection process of a preceding cycle, and a shear force is given to the molten resin that occupies the resin accumulation region in a plasticizing process of a subsequent cycle. An inside of massive reinforcing fibers F is impregnated with the molten resin by giving a high injection pressure to the molten resin that occupies the resin accumulation region. Next, dispersion of the reinforcing fibers is promoted by giving a shear force in the plasticizing process of the subsequent cycle.
    Type: Application
    Filed: May 30, 2014
    Publication date: January 19, 2017
    Inventors: Toshihiko KARIYA, Munehiro NOBUTA, Naoki TODA, Kiyoshi KINOSHITA, Takeshi YAMAGUCHI
  • Publication number: 20170001353
    Abstract: There is provided a screw of an injection molding machine that can eliminate uneven distribution of reinforcing fibers without giving an excessive shear force to the reinforcing fibers. A screw is provided inside a heating cylinder of an injection molding machine to which a resin pellet is fed on an upstream side in a conveyance direction of resin and to which reinforcing fibers are fed on a downstream side therein, and includes: a first stage at which the resin pellet which is fed is melted; and a second stage that continues to the first stage, and at which molten resin and the reinforcing fibers are mixed with each other. A second flight provided at the second stage includes: a large-diameter flight with a relatively large outer diameter; and a small-diameter flight with a relatively small outer diameter.
    Type: Application
    Filed: June 9, 2014
    Publication date: January 5, 2017
    Applicant: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Toshihiko KARIYA, Munehiro NOBUTA, Naoki TODA, Kiyoshi KINOSHITA, Takeshi YAMAGUCHI
  • Publication number: 20170001354
    Abstract: There is provided a screw of an injection molding machine that can eliminate uneven distribution of additive components without giving an excessive shear force to the additive components. An injection molding method of the present invention includes: a plasticizing process of feeding a resin pellet P and additive components to a heating cylinder 201 including a screw 10 that can rotate around a rotation axis C and can advance and retreat along the rotation axis C, and generating molten resin M by rotating the screw 10 in a normal direction; and an injection process of injecting to a cavity the molten resin M containing the additive components. In the plasticizing process, retreat operation of forcibly retreating the screw 10 is performed at a predetermined velocity by a predetermined stroke D1 or a predetermined time.
    Type: Application
    Filed: April 20, 2015
    Publication date: January 5, 2017
    Inventors: Munehiro NOBUTA, Naoki TODA, Toshihiko KARIYA, Takeshi YAMAGUCHI, Kiyoshi KINOSHITA
  • Publication number: 20160009010
    Abstract: The injection molding apparatus of the present invention includes: a heating cylinder; a screw that is provided rotatably in an inner portion of the heating cylinder; a resin feed hopper that feeds a resin pellet; and a fiber feed device that is provided ahead of the resin feed hopper and feeds reinforcing fibers into the heating cylinder. The screw includes a first stage that is located on a rear side, and in which the resin pellet is melted, and a second stage that is located on a front side, and in which the melted resin pellet and the reinforcing fibers are mixed, and a lead of a second flight provided in the second stage is larger than a lead of a first flight provided in the first stage.
    Type: Application
    Filed: November 6, 2013
    Publication date: January 14, 2016
    Inventors: Toshihiko KARIYA, Naoki TODA, Munehiro NOBUTA, Kiyoshi KINOSHITA, Takeshi YAMAGUCHI, Kosuke IKEDA, Yuji SUZUMURA, Hitoshi ONUMA, Ryoji OKABE, Masanori TAKAHASHI
  • Publication number: 20160001477
    Abstract: In an injection molding method, using a heating cylinder having on the front end thereof a discharge nozzle, a single axis screw is rotatable inside the heating cylinder, a fiber-supplying device fills reinforcing fiber into the heating cylinder, and injection molding is performed while supplying the reinforcing fiber and the resin starting material separately and supplying the reinforcing fiber on the front side of the resin starting material. The method includes a plasticization process for obtaining a specified amount of a kneaded product by retracting the screw while rotating in the normal direction to melt the resin starting material and knead reinforcing fiber into the melted resin starting material, and an injection process for discharging the kneaded product from the discharge nozzle by advancing the screw. Reinforcing fiber is supplied into the heating cylinder in the injection process.
    Type: Application
    Filed: March 25, 2013
    Publication date: January 7, 2016
    Inventors: Ryoji OKABE, Toshihiko KARIYA, Naoki TODA, Munehiro NOBUTA
  • Patent number: 9085103
    Abstract: A plasticizing screw for injection molding according to the present invention is a plasticizing screw for injection molding that is installed in an injection molding machine which performs injection molding by plasticizing granular thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a flight, and a mixer. The mixer is provided in plural stages in an axial direction, and the number of fins of the mixer of each stage increases toward a leading end side in the axial direction from a rear end side in the axial direction. Further, the protrusion height of each fin from the peripheral surface of the shaft is lower than the protrusion height of the flight from the peripheral surface of the shaft.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: July 21, 2015
    Assignee: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta
  • Patent number: 8900506
    Abstract: A plasticizing screw for injection molding according to the present invention is installed in an injection molding machine that performs injection molding by plasticizing thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a main flight, and a sub-flight. The protrusion height of the main flight from the circumferential surface of the shaft is formed to be constant in at least an area in which the sub-flight is provided.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: December 2, 2014
    Assignee: Mitsubishi Heavy Industries Plastic Technology
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta
  • Publication number: 20130200552
    Abstract: A plasticizing screw for injection molding according to the present invention is a plasticizing screw for injection molding that is installed in an injection molding machine which performs injection molding by plasticizing granular thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a flight, and a mixer. The mixer is provided in plural stages in an axial direction, and the number of fins of the mixer of each stage increases toward a leading end side in the axial direction from a rear end side in the axial direction. Further, the protrusion height of each fin from the peripheral surface of the shaft is lower than the protrusion height of the flight from the peripheral surface of the shaft.
    Type: Application
    Filed: October 29, 2010
    Publication date: August 8, 2013
    Applicant: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta
  • Publication number: 20130099421
    Abstract: A plasticizing screw for injection molding according to the present invention is installed in an injection molding machine that performs injection molding by plasticizing thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a main flight, and a sub-flight. The protrusion height of the main flight from the circumferential surface of the shaft is formed to be constant in at least an area in which the sub-flight is provided.
    Type: Application
    Filed: October 25, 2010
    Publication date: April 25, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO. LTD
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta
  • Publication number: 20130072624
    Abstract: A molded resin product for a vehicle structural member or an aircraft structural member according to the present invention is formed by injection-molding of thermoplastic resin feedstock containing reinforcement fibers by using a screw provided at a leading end portion thereof with a mixer protruding in a radial direction. In the injection-molded product, the reinforcement fiber content ratio is greater than or equal to 20% by weight and the weight-average fiber length of the reinforcement fibers in an evaluation target area having a certain size is greater than or equal to 1 mm and less than or equal to 3 mm.
    Type: Application
    Filed: November 8, 2010
    Publication date: March 21, 2013
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta