EP3909654A1 - Chaîne pour une utilisation dans une raquette - Google Patents

Chaîne pour une utilisation dans une raquette Download PDF

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Publication number
EP3909654A1
EP3909654A1 EP21169504.4A EP21169504A EP3909654A1 EP 3909654 A1 EP3909654 A1 EP 3909654A1 EP 21169504 A EP21169504 A EP 21169504A EP 3909654 A1 EP3909654 A1 EP 3909654A1
Authority
EP
European Patent Office
Prior art keywords
string
equal
untreated
racket
elongation rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21169504.4A
Other languages
German (de)
English (en)
Inventor
Yuko KUJIRAI
Takehiko Hyodo
Kazuyoshi Shiga
Masanori Taguchi
Hiroaki Tanaka
Kunio Niwa
Yuta SHIMANE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP3909654A1 publication Critical patent/EP3909654A1/fr
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/02—Strings; String substitutes; Products applied on strings, e.g. for protection against humidity or wear
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/008—Treatment with radioactive elements or with neutrons, alpha, beta or gamma rays
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/02—Tennis
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/04—Badminton
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/06—Squash
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/10—Frames made of non-metallic materials, other than wood
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A63B60/14—Coverings specially adapted for handles, e.g. sleeves or ribbons
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/32—Polyesters
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/34—Polyamides

Definitions

  • the present invention relates to the strings of, for example, tennis rackets, badminton rackets, and squash rackets.
  • a tennis racket includes a frame and a string.
  • natural gut was primarily used as the string. Natural gut is made of sheep intestine. Natural gut is inferior in terms of durability. In addition, natural gut is expensive. However, natural gut has an excellent hitting feeling.
  • Synthetic resin strings have excellent durability.
  • a string made of a resin composition whose base material is polyester or nylon is widely used.
  • Japanese Laid-Open Patent Application Publication No. 2009-226107 discloses a string in which polyester is used.
  • the hitting feeling is hard.
  • the hitting feeling of nylon strings is better than the hitting feeling of polyester strings.
  • the hitting feeling of nylon strings is still harder than the hitting feeling of natural gut.
  • An object of the present invention is to provide a string for use in a racket, the string having an excellent hitting feeling-durability balance.
  • a method of manufacturing a string for use in a racket according to the present invention includes: (A) preparing an untreated string; and (B) irradiating the untreated string with radioactive rays.
  • a string for use in a racket according to the present invention has an excellent hitting feeling and excellent durability.
  • the step (B) includes irradiating the untreated string with gamma rays.
  • the step (B) includes irradiating the untreated string with the radioactive rays in an irradiation amount of greater than or equal to 250 kGy but less than or equal to 2000 kGy.
  • a material of the untreated string prepared in the step (A) is a resin composition whose base material is a thermoplastic resin.
  • the thermoplastic resin is polyester or nylon.
  • Another aspect of the present invention is directed to a string for use in a racket, and an elongation rate P1 of the string when the string is tensioned to a stress of 217 MPa is higher than or equal to 9.25% but lower than or equal to 18.6%.
  • a material of the string is a resin composition whose base material is a thermoplastic resin.
  • the thermoplastic resin is polyester.
  • Yet another aspect of the present invention is directed to a string for use in a racket, and an elongation rate P2 of the string when the string is tensioned to a stress of 221 MPa is higher than or equal to 19.3% but lower than or equal to 22.0%.
  • a material of the string is a resin composition whose base material is a thermoplastic resin.
  • the thermoplastic resin is nylon.
  • Yet another aspect of the present invention is directed to a racket including a frame and a string, and an elongation rate P1 of the string when the string is tensioned to a stress of 217 MPa is higher than or equal to 9.25% but lower than or equal to 18.6%.
  • Yet another aspect of the present invention is directed to a racket including a frame and a string, and an elongation rate P2 of the string when the string is tensioned to a stress of 221 MPa is higher than or equal to 19.3% but lower than or equal to 22.0%.
  • FIG. 1 shows a tennis racket 2.
  • the tennis racket 2 includes a frame 4, a grip 6, an end cap 8, and a string 10.
  • the tennis racket 2 can be used in regulation-ball tennis.
  • the frame 4 includes a head 12, two throats 14, and a shaft 16.
  • the head 12 forms the contour of a face 18.
  • the front shape of the head 12 is substantially an ellipse.
  • the major axis direction of the ellipse coincides with the axial direction Y of the tennis racket 2.
  • the minor axis direction of the ellipse coincides with the width direction X of the tennis racket 2.
  • One end of each throat 14 is continuous with the head 12. At the vicinity of the other end thereof, the throat 14 merges with the other throat 14.
  • the throats 14 extend from the head 12 to the shaft 16.
  • the shaft 16 extends from the location where the two throats 14 merge together.
  • the shaft 16 is formed so as to be continuous with, and integrated with, the throats 14.
  • a portion of the head 12, the portion being positioned between the two throats 14, is a yoke 20.
  • the frame 4 is constituted by a pipe. In other words, the frame 4 is hollow.
  • the material of the pipe is a fiber-reinforced resin.
  • the matrix resin of the fiber reinforced resin is a thermosetting resin.
  • the thermosetting resin is typically an epoxy resin.
  • the fibers of the fiber reinforced resin are typically carbon fibers.
  • the fibers are filament fibers.
  • the grip 6 is formed by a tape wound around the shaft 16.
  • the grip 6 suppresses a slip between a hand of a player and the tennis racket 2 when the tennis racket 2 is swung.
  • the string 10 is stretched on the head 12.
  • the string 10 is stretched along the width direction X and the axial direction Y.
  • portions extending along the width direction X are referred to as transverse strings 10a.
  • portions extending along the axial direction Y are referred to as longitudinal strings 10b.
  • the face 18 is formed by a plurality of transverse strings 10a and a plurality of longitudinal strings 10b. The face 18 generally extends along an X-Y plane.
  • FIG. 2 shows the string 10.
  • the string 10 is of a monofilament type.
  • the string 10 may be formed by twisting a plurality of filaments together.
  • the string 10 may have a plurality of layers.
  • the string 10 may have a coating on its surface.
  • the material of the string 10 is a resin composition.
  • the base resin of the resin composition is a thermoplastic resin.
  • the resin composition may contain various additive agents in addition to the base resin. Specific examples of the additive agents include an ultraviolet absorber, a softener, a plasticizer, and a colorant.
  • thermoplastic resin suitable for use in the string 10 include polyester and nylon.
  • the string 10 in which polyester or nylon is used has better durability than a natural gut string. Even when the string 10 hits a tennis ball repeatedly, breakage of the string 10 does not easily occur.
  • the untreated string means a string that has not been subjected to irradiation with radioactive rays, which will be described below.
  • a known method can be adopted for preparing the untreated string.
  • a drawing process is adopted for preparing the untreated string.
  • the base resin is heated and melted, to which additive agents are added, and thereby a molten resin composition is obtained.
  • the molten resin composition is cooled while being extruded from a spinneret, and thereby a base string is obtained.
  • the base string is stretched, and thereby the untreated string is obtained.
  • the untreated string is irradiated with radioactive rays.
  • the radioactive rays include alpha rays, beta rays, gamma rays, and X-rays.
  • Use of gamma rays is preferable since gamma rays have been used in industrial settings.
  • Gamma rays have been put into practical use to kill pests and bacteria on food products after their packaging.
  • Gamma rays have also been put into practical use to prevent sprouting of agricultural produce, such as potatoes.
  • Gamma rays are generated due to a phenomenon in which when the energy level of atomic nuclei shifts from an unstable state to a stable state, the atomic nuclei release energy.
  • cobalt-60 gamma rays are used.
  • the untreated string may be irradiated with the radioactive rays on the drawing equipment.
  • the untreated string that has been wound up may be irradiated with the radioactive rays.
  • the untreated string that has been cut to a predetermined size and packaged may be irradiated with the radioactive rays.
  • the untreated string is softened, and thereby the string 10 is obtained. It is considered that the reason for the untreated string to be softened is that resin crystals that are produced in the untreated string due to the drawing or the like disappear when the untreated string is irradiated with the radioactive rays.
  • One untreated string may be irradiated with the radioactive rays a plurality of times repeatedly.
  • the string 10 When a tensile load is applied to the string 10, the string 10 stretches sufficiently. When a tennis ball is hit with the racket 2 in which the string 10 is used, the face 18 deforms sufficiently. The player feels that the hitting feeling of the racket 2 is "soft". The string 10 can contribute the hitting feeling of the racket 2. In addition, the string 10 can reduce damage to a joint of the player.
  • the base resin is preferably polyester.
  • the untreated string whose base resin is nylon may be irradiated with the radioactive rays.
  • the string 10 having a hitting feeling close to that of natural gut can be obtained.
  • the irradiation with the radioactive rays does not significantly impair the durability.
  • an elongation rate P1 of the string 10 when the string 10 is tensioned to a stress of 217 MPa is preferably higher than or equal to 9.25% but lower than or equal to 18.6%.
  • the string 10 having the elongation rate P1 of higher than or equal to 9.25% has an excellent hitting feeling.
  • the elongation rate P1 is more preferably higher than or equal to 9.30%, and particularly preferably higher than or equal to 9.35%.
  • the string 10 having the elongation rate P1 of lower than or equal to 18.6% has excellent durability.
  • the elongation rate P1 is more preferably lower than or equal to 17.0%, and particularly preferably lower than or equal to 15.0%.
  • an elongation rate P2 of the string 10 when the string 10 is tensioned to a stress of 221 MPa is preferably higher than or equal to 19.3% but lower than or equal to 22.0%.
  • the string 10 having the elongation rate P2 of higher than or equal to 19.3% has an excellent hitting feeling.
  • the elongation rate P2 is more preferably higher than or equal to 19.5%, and particularly preferably higher than or equal to 19.7%.
  • the string 10 having the elongation rate P2 of lower than or equal to 22.0% has excellent durability.
  • the elongation rate P2 is more preferably lower than or equal to 21.5%, and particularly preferably lower than or equal to 21.2%.
  • an average tensile force when a general string is stretched on a tennis racket is in a range from 217 MPa to 221 MPa. Therefore, in the present invention, the string 10 is evaluated based on the elongation rate P1 when the string 10 is tensioned to a stress of 217 MPa and the elongation rate P2 when the string 10 is tensioned to a stress of 221MPa.
  • elongation rates P1 and P2 are measured by a tensile test machine.
  • the test machine includes a pair of chucks.
  • the string 10 is wound around each chuck. Test conditions are as indicated below.
  • the measurement is performed three times for each string 10, and the median value is used as a representative value.
  • the irradiation amount of the radioactive rays is preferably greater than or equal to 250 kGy but less than or equal to 2000 kGy.
  • the string 10 having an excellent hitting feeling can be obtained by a manufacturing method in which the irradiation amount is greater than or equal to 250 kGy.
  • the irradiation amount is more preferably greater than or equal to 350 kGy, and particularly preferably greater than or equal to 400 kGy.
  • the irradiation with the radioactive rays in an irradiation amount of less than or equal to 2000 kGy can be performed at low cost.
  • the irradiation amount is more preferably less than or equal to 1600 kGy, and particularly preferably less than or equal to 1400 kGy.
  • the total irradiation amount is preferably within the above range.
  • a commercially available string (Dunlop tennis string: trade name "Black Widow") was prepared.
  • the base resin of the string is polyester.
  • the string was irradiated with cobalt-60 gamma rays.
  • the irradiation amount was 500 kGy.
  • the string was further irradiated with cobalt-60 gamma rays in an irradiation amount of 500 kGy. That is, the total irradiation amount was 1000 kGy.
  • the string was subjected to a tensile test. In the test, the elongation rate of the string was measured at loads of 40 lbs, 50 lbs, 60 lbs, and 70 lbs. The measurement results are shown in Table 1 below.
  • a commercially available string I was prepared.
  • the base resin of the string is polyester.
  • the elongation rate of the string was measured in the same manner as in Test Example 1. The measurement results are shown in Table 2 below.
  • a commercially available string II was prepared.
  • the base resin of the string is polyester.
  • the elongation rate of the string was measured in the same manner as in Test Example 1. The measurement results are shown in Table 2 below.
  • a commercially available string III was prepared.
  • the base resin of the string is nylon.
  • the string was irradiated with cobalt-60 gamma rays a plurality of times.
  • the irradiation amounts were 250 kGy, 500 kGy, and 1000 kGy, respectively.
  • the string was subjected to a tensile test. In the test, the elongation rate of the string was measured at loads of 50 lbs, 60 lbs, and 70 lbs. The measurements results are shown in Table 3 below. Table 1: Evaluation of Elongation Rate (%).
  • Test Example 2 Test Example 3 Commercially Available Product I Commercially Available Product II Polyester Polyester Gamma Rays (kGy) 0 500 1000 0 500 1000 40 lbs 4.37 5.12 4.86 4.89 4.75 4.75 50 lbs 6.3 8.4 10.4 7.1 7.1 7.6 60 lbs 8.1 10.8 13.3 9.2 9.4 10.1 70 lbs 7.7 10.4 12.8 11.1 11.6 12.5 Table 3: Evaluation of Elongation Rate (%). Test Example 4 Commercially Available Product III Nylon Gamma Rays (kGy) 0 250 500 1000 50 lbs 15.8 16.4 18.7 19.2 60 lbs 17.8 19.3 21.4 21.9 70 lbs 19.7 20.7 23.3 24.4
  • a commercially available string (the aforementioned string, i.e., trade name "Black Widow") was prepared.
  • the base resin of the string is polyester.
  • the string was irradiated with cobalt-60 gamma rays. The irradiation amount was 250 kGy.
  • a commercially available natural gut string was prepared as Comparative Example 4.
  • the elongation rate P1 of each string was measured in the previously described manner. The measurement results are shown in Tables 4 to 6 below.
  • the evaluation results are shown in Tables 4 to 6 below. The greater the numerical value, the better the hitting feeling.
  • each string was evaluated by a stress relaxation test machine on a scale of 1 to 5. Test conditions were as indicated below.
  • a commercially available string (the aforementioned string III) was prepared.
  • the base resin of the string is nylon.
  • the string was irradiated with cobalt-60 gamma rays.
  • the irradiation amount was 250 kGy.
  • a commercially available natural gut string was prepared as Comparative Example 6.
  • the elongation rate P2 of each string was measured in the previously described manner. The measurement results are shown in Table 7 below.
  • the measurement results are shown in Table 7 below. The greater the numerical value, the better the hitting feeling.
  • each string was evaluated by a stress relaxation test machine on a scale of 1 to 5. Test conditions were as indicated below.
  • the string according to the present invention is suitable for use in various sports, such as tennis, soft tennis, squash, and badminton.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP21169504.4A 2020-05-11 2021-04-20 Chaîne pour une utilisation dans une raquette Pending EP3909654A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020083299A JP2021177820A (ja) 2020-05-11 2020-05-11 ラケット用のストリング

Publications (1)

Publication Number Publication Date
EP3909654A1 true EP3909654A1 (fr) 2021-11-17

Family

ID=75625408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21169504.4A Pending EP3909654A1 (fr) 2020-05-11 2021-04-20 Chaîne pour une utilisation dans une raquette

Country Status (3)

Country Link
US (1) US20210346769A1 (fr)
EP (1) EP3909654A1 (fr)
JP (1) JP2021177820A (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30555E (en) 1979-11-08 1981-03-24 Method of producing string of polyamide and stringed rackets with such string
US4586708A (en) * 1984-03-09 1986-05-06 Imperial Chemical Industries Plc Sports racket strings of a synthetic thermoplastic polymeric material
EP0319191A2 (fr) * 1987-12-01 1989-06-07 Gosen Co., Ltd. Corde pour raquettes
CN1170606C (zh) * 1996-03-06 2004-10-13 株式会社高纤 球拍用细绳及其制造方法
JP2009226107A (ja) 2008-03-25 2009-10-08 Toray Monofilament Co Ltd ラケット用ガット
WO2020031529A1 (fr) * 2018-08-10 2020-02-13 株式会社ゴーセン Corde de raquette et son procédé de fabrication

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842705A (en) * 1973-03-15 1974-10-22 D Woodard Stringed instruments with improved strings due to irradiation and process for producing the same
JP2007284829A (ja) * 2006-04-18 2007-11-01 Toyobo Co Ltd 耐熱性架橋型ポリエステル繊維コード
ES2361141T3 (es) * 2009-03-18 2011-06-14 Baumhueter Extrusion Gmbh Fibra polimérica, su uso y procedimiento de fabricación.
US8722757B2 (en) * 2011-07-22 2014-05-13 Ut-Battelle, Llc Fiber-based adsorbents having high adsorption capacities for recovering dissolved metals and methods thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30555E (en) 1979-11-08 1981-03-24 Method of producing string of polyamide and stringed rackets with such string
US4586708A (en) * 1984-03-09 1986-05-06 Imperial Chemical Industries Plc Sports racket strings of a synthetic thermoplastic polymeric material
EP0319191A2 (fr) * 1987-12-01 1989-06-07 Gosen Co., Ltd. Corde pour raquettes
CN1170606C (zh) * 1996-03-06 2004-10-13 株式会社高纤 球拍用细绳及其制造方法
JP2009226107A (ja) 2008-03-25 2009-10-08 Toray Monofilament Co Ltd ラケット用ガット
WO2020031529A1 (fr) * 2018-08-10 2020-02-13 株式会社ゴーセン Corde de raquette et son procédé de fabrication

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Publication number Publication date
US20210346769A1 (en) 2021-11-11
JP2021177820A (ja) 2021-11-18

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