Patents by Inventor Tsutomu NITANDA

Tsutomu NITANDA 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: 11110629
    Abstract: An object of the present invention is to provide a method for producing resin pellets, in which occurrence of defective pellets is suppressed. The method for producing resin pellets of the present invention includes the following steps, and a strand-shaped resin has a diameter of 1.5 to 4.5 mm, is discharged at a take-off speed of 1.5 m/s to 10 m/s, a die has 10 or more die holes, and a strand interval X defined by Formula 2 satisfies the following Formula 1; step 1: discharging a molten thermoplastic resin through a die in the form of a strand; step 2: cooling the discharged strand-shaped resin using a refrigerant; and step 3: cutting the cooled strand-shaped resin to obtain resin pellets; 1.73×a?Xb?2.81×a??Formula 1 a=0.524, b=0.
    Type: Grant
    Filed: May 15, 2018
    Date of Patent: September 7, 2021
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Katsumi Shinohara, Tsutomu Nitanda
  • Publication number: 20200406504
    Abstract: An object of the present invention is to provide a method for producing resin pellets, in which occurrence of defective pellets is suppressed. The method for producing resin pellets of the present invention includes the following steps, and a strand-shaped resin has a diameter of 1.5 to 4.5 mm, is discharged at a take-off speed of 1.5 m/s to 10 m/s, a die has 10 or more die holes, and a strand interval X defined by Formula 2 satisfies the following Formula 1; step 1: discharging a molten thermoplastic resin through a die in the form of a strand; step 2: cooling the discharged strand-shaped resin using a refrigerant; and step 3: cutting the cooled strand-shaped resin to obtain resin pellets; 1.73×a?Xb?2.81×a??Formula 1 a=0.524, b=0.
    Type: Application
    Filed: May 15, 2018
    Publication date: December 31, 2020
    Inventors: Katsumi SHINOHARA, Tsutomu NITANDA