US20140155201A1 - Artificial feather for shuttlecock, shuttlecock, and method of manufacturing artificial feather for shuttlecock - Google Patents

Artificial feather for shuttlecock, shuttlecock, and method of manufacturing artificial feather for shuttlecock Download PDF

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Publication number
US20140155201A1
US20140155201A1 US14/232,709 US201214232709A US2014155201A1 US 20140155201 A1 US20140155201 A1 US 20140155201A1 US 201214232709 A US201214232709 A US 201214232709A US 2014155201 A1 US2014155201 A1 US 2014155201A1
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Prior art keywords
shuttlecock
artificial feather
rachis
vane
sample
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US14/232,709
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English (en)
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Wataru Yoneyama
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Yonex KK
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Yonex KK
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Assigned to YONEX KABUSHIKI KAISHA reassignment YONEX KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YONEYAMA, WATARU
Publication of US20140155201A1 publication Critical patent/US20140155201A1/en
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B67/00—Sporting games or accessories therefor, not provided for in groups A63B1/00 - A63B65/00
    • A63B67/18—Badminton or similar games with feathered missiles
    • A63B67/183—Feathered missiles
    • A63B67/187—Shuttlecocks
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B67/00—Sporting games or accessories therefor, not provided for in groups A63B1/00 - A63B65/00
    • A63B67/18—Badminton or similar games with feathered missiles
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B67/00—Sporting games or accessories therefor, not provided for in groups A63B1/00 - A63B65/00
    • A63B67/18—Badminton or similar games with feathered missiles
    • A63B67/183—Feathered missiles
    • A63B67/187—Shuttlecocks
    • A63B67/19—Shuttlecocks with several feathers connected to each other
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites

Definitions

  • the present invention relates to an artificial feather for shuttlecocks, a shuttlecock, and a method of manufacturing artificial feather for a shuttlecock.
  • natural feather shuttlecocks have a structure using approximately 16 natural feathers of geese, ducks or the like, and the ends of the stems of the feathers are embedded into the hemispherical platform (base portion) made of cork covered with skin.
  • the feather used for natural feather shuttlecocks have a feature of the specific gravity being small and being extremely light.
  • the specific gravity of the stem portion is approximately 0.4 and the vane portion is approximately 0.15.
  • feather has high rigidity and thereby a unique flying performance and comfortable impression when hitting natural feather shuttlecocks can be perceived.
  • the feather used as the material for natural feather shuttlecocks are collected from the aforementioned waterfowls and moreover, feathers of specific portions of the waterfowl are suitable for shuttlecocks which does not mean that feathers from any portion of the waterfowl can be used and thus the amount of feather for a shuttlecock that can be collected from one waterfowl is a miniscule number.
  • the excellent hitting impression of the natural shuttlecock results from not only that the natural feathers are lightweight, but also that the rachises of the feathers are high in rigidity and high in repulsion. Therefore, the artificial feathers used in the artificial feather shuttlecocks are also required to be not only lightweight but also high in rigidity and high in repulsion in the rachis portion that corresponds to the rachis of natural feathers.
  • fiber reinforced resin is used as the material of the rachis portion of the artificial feather shuttlecock.
  • glass reinforced resin is used as the fiber reinforced resin, sufficient repulsion cannot be obtained and thus the hitting impression of the artificial shuttlecock falls short of the natural shuttlecock.
  • reinforced resin using carbon fibers when the carbon fibers are combined to a degree that sufficient hitting impression can be obtained (to a degree that sufficient rigidity is obtained), the shuttlecock becomes easy to break, and there arises a problem in durability.
  • the present invention provides improvement in hitting impression without loss of durability.
  • a main aspect of the invention is an artificial feather for a shuttlecock including:
  • the rachis portion being made of resin including glass fiber and carbon nanotube.
  • FIG. 1 is a perspective view of an artificial feather shuttlecock seen from the side with a base portion.
  • FIG. 2 is a perspective view of the artificial feather shuttlecock seen from the side with an artificial feather.
  • FIG. 3 is a perspective view of the artificial feather.
  • FIGS. 4A to 4C are explanatory views of a modified example of an artificial feather 10 .
  • FIG. 4A is a plan view of the artificial feather 10 of the modified example seen from the front side.
  • FIG. 4B is a plan view of the artificial feather 10 of the modified example seen from the back side.
  • FIG. 4C is a view of the artificial feather 10 of the modified example seen from the upper side.
  • FIG. 5 is a view showing a part of a skirt portion 4 configured with the artificial feathers 10 of the modified example seen from above.
  • FIG. 6 is a chart showing materials and evaluation results of samples.
  • FIG. 7A is a photograph taken of a comparison sample A.
  • FIG. 7B is a photograph taken of sample C.
  • FIGS. 8A and 8B are photomicrographs showing sections of a rachis portion of sample B.
  • FIG. 8A is a photomicrograph of a section
  • FIG. 8B is a photomicrograph of a surface after a part has been partially melted with a solvent.
  • An aspect of the present invention is an artificial feather for a shuttlecock including:
  • the rachis portion being made of resin including glass fiber and carbon nanotube.
  • the rachis portion is preferably put in between at least two sheet form members including the vane portion. In this way, the portion that is visible as black can be decreased, and the visibility of the artificial feather shuttlecock improves.
  • the carbon nanotube preferably includes a functional group.
  • the carbon nanotube preferably includes at least one of a carboxyl group and a hydroxyl group as the functional group. With such an artificial feather for shuttlecocks, further improvement in hitting impression can be obtained.
  • the content of the carbon nanotube in the resin preferably includes the glass fiber and the carbon nanotube is equal to or less than 0.4 weight %.
  • Another aspect of this invention is a shuttlecock including: a base portion; and a plurality of artificial feathers arranged circularly to the base portion, wherein
  • the artificial feather includes a sheet form vane section and a rachis portion supporting the vane portion,
  • the rachis portion being formed with resin including glass fiber and carbon nanotube.
  • Another aspect of this invention is a manufacturing method of an artificial feather for a shuttlecock including a sheet from vane portion and a rachis portion supporting the vane portion, the rachis portion being formed with resin including glass fiber and carbon nanotube.
  • the artificial feather with good hitting impression can be manufactured without loss of durability.
  • the method preferably including:
  • FIGS. 1 and 2 show external views of an artificial feather shuttlecock 1 including an artificial feather 10 .
  • FIG. 1 is a perspective view of the artificial feather shuttlecock 1 seen from the side with the base portion 2 .
  • FIG. 2 is a perspective view of the artificial feather shuttlecock 1 seen from the side with the artificial feather 10 .
  • the artificial feather shuttlecock 1 includes the base portion 2 , a plurality of artificial feathers 10 imitating natural feather, and string like members 3 that are for fixing the artificial feathers 10 to each other.
  • the base portion 2 is made by, for example, covering a thin skin on a cork platform.
  • the shape of the base portion 2 is a hemispherical shape with a diameter of 25 mm to 28 mm, and the base portion 2 has a flat surface. Along the circumference of this flat surface the roots of the plurality of the artificial feathers 10 are embedded circularly.
  • the plurality of the artificial feathers 10 are arranged so that the spaces in between them become wider the further away from the base portion 2 . In this way, the skirt portion 4 is formed with the plurality of the artificial feathers 10 .
  • the plurality of the artificial feathers 10 are fixed to each other with the string like members 3 (for example, cotton strings).
  • FIG. 3 is an external view of the artificial feather 10 .
  • the artificial feather 10 includes the vane portion 12 and the rachis portion 14 .
  • the vane portion 12 is a part corresponding to a vane of a natural feather
  • the rachis portion 14 is a part corresponding to a rachis of a natural feather.
  • the up-down direction is defined along the rachis portion 14
  • the side with the vane portion 12 is defined as up and the opposite side is defined as down.
  • the left-right direction is defined along a direction in which the vane portion 12 extends from the rachis portion 14 .
  • the front and back are defined based on a state in which the artificial feathers 10 are attached to the base portion 2 . Below, each of the components is described in accordance with up-down, left-right, front-back as defined in the drawing.
  • the vane portion 12 is a sheet form member imitating the shape of the vane of a natural feather.
  • the vane portion 12 can be made with for example, a nonwoven cloth or resin and the like. In this embodiment, a nonwoven cloth that can reproduce the outer shape of a natural feather by cutting is used.
  • a reinforcing film is formed on the surface of the vane portion 12 .
  • the reinforcing film can be formed by applying resin, and various applying methods, for example, dipping, spraying, roll coating, and the like can be used.
  • the reinforcing film can be formed on one side or on both sides of the vane portion 12 .
  • the reinforcing film can be formed on an entire surface or on one part of the vane portion 12 .
  • the rachis portion 14 is an elongated member imitating the rachis shape of a natural feather, and the rachis portion is a member that supports the vane portion 12 .
  • the rachis portion 14 includes a vane supporting portion 14 A that supports an area from an upper end to a lower end of the vane portion 12 and a calamus portion 14 B that protrudes from the vane portion 12 .
  • the calamus portion 14 B is a portion corresponding to a calamus (calamus: this section is also sometimes called as quill) of a natural feather.
  • the lower end of the calamus portion 14 B is embedded in the base portion 2 and fixed to the base portion 2 .
  • the material of the rachis portion 14 is to be described later.
  • the rachis portion 14 in the figure is shown having a quadrangle cross section shape.
  • the cross section shape of the rachis portion 14 may be a rhombus, a circular shape, or an oval shape.
  • the cross section shape of the rachis portion 14 can be made as a shape with one part protruding out such as a T shape or a cross shape.
  • the cross section shape of the rachis portion 14 may be different in the up-down direction so that, for example, the upper side is a circular shape and the lower side is a quadrangle shape.
  • the rachis portion 14 in the figure is formed so that its cross section shape becomes larger as it gets nearer to the lower side.
  • the size of the cross section shape in the up-down direction can be the same without changing, and the size of the cross section shape may change smoothly.
  • the vane portion 12 is supported in the back side of the vane supporting portion 14 A.
  • the vane portion 12 may be supported in the front side of the vane supporting portion 14 A, however.
  • the vane portion 12 may be made of two sheets, and the two vane portions 12 may sandwich the vane supporting portion 14 A.
  • the vane portion 12 may be provided buried inside the vane supporting portion 14 A.
  • the black color of the vane supporting portion 14 A can be made hard to see.
  • FIGS. 4A to 4C are explanatory views of the modified example of the artificial feather 10 .
  • FIG. 4A is a plan view of the artificial feather 10 in the modified example seen from the front side.
  • FIG. 4B is a plan view of the artificial feather 10 in the modified example seen from the back side.
  • FIG. 4C is a view of the artificial feather 10 in the modified example seen from the upper side. Members that have already been described have the same reference numbers.
  • the artificial feather 10 in the modified example has the vane portion 12 and the rachis portion 14 and also a reinforcing material 15 .
  • the reinforcing material 15 is a sheet form member provided to the front side of the artificial feather 10 and is formed from a foam body (such as a foam polyethylene).
  • the reinforcing material 15 is in a laminated state on the vane portions 12 and adhered with such as an adhesive or both sided adhesive tape.
  • the vane portion 12 may be arranged to the front side or the reinforcing material 15 may be arranged to the front side.
  • the vane portion 12 With a laminated structure made of the vane portion 12 and the reinforcing material 15 made of a foam body, there is no loss of lightness, and even in the case the vane portion 12 is hit hard when hitting, such impact is absorbed by the reinforcing material 15 , and the vane portion 12 can be prevented from breaking.
  • the front-back relationship of the artificial feather 10 can be appropriately decided in compliance with demands for the shuttlecock as a product such as beautiful appearance and durability.
  • the vane supporting portion 14 A of the rachis portion 14 is put between the sheet form vane portion 12 and the sheet form reinforcing material 15 . In this way, even when the rachis portion 14 is made of a black material, the vane supporting portion 14 A of the rachis portion 14 is hidden in between the vane portion 12 and the reinforcing material 15 and is difficult to see from the outside.
  • the portion that is visible as black is only the calamus portion 14 B, and the portion that looks black compared with the artificial feather in FIG. 3 described above can be lessened.
  • the artificial feather shuttlecock using the artificial feather 10 in the modified example can be improved in visibility compared with the artificial feather shuttlecock in FIG. 1 described above.
  • the part that looks black of the rachis portion 14 may be lessened, however, by putting the rachis portion 14 between the two vane portions 12 . In this way, by putting the rachis portion 14 between at least two sheet form members including the vane portions 12 , the part of the rachis portion 14 that looks black can be lessened.
  • the reinforcing material has a flat shape with the edges chipped in parts overlapping with the vane portions 12 of the adjacent artificial feathers 10 .
  • the reason for this is to make the difference in thickness between the overlapping area 30 and the single area 40 small, as shown in FIG. 5 , and to make the thickness of the skirt portion 4 as uniform as possible.
  • the material of the rachis portion 14 will be described later, and it is necessary for the rachis portion 14 to be lightweight. The reason for this is when the rachis portion 14 becomes heavy and the weight balance of the shuttlecock becomes imbalanced, the artificial feather shuttlecock will have a different flying performance from the natural feather shuttlecock, and also when the artificial shuttlecock 1 becomes heavy the amount that the artificial feather shuttlecock 1 presses down on the gut becomes large, and the impression when hitting becomes heavy (the hitting impression deteriorates).
  • the rachis portion 14 preferably has high rigidity and high force of repulsion.
  • the shuttlecock when the shuttlecock receives force from the gut, not only the base portion 2 but also the vane portions 12 and the rachis portion 14 contact the gut. Therefore, when the rachis portion 14 is high in rigidity and repulsion, the amount that the artificial feather shuttlecock 1 presses down on the gut becomes small, and the hitting impression becomes light (the hitting impression improves). Supposing that the rachis portion 14 is low in rigidity and repulsion, the amount that the shuttlecock presses down on the gut becomes large and the hitting impression becomes heavy (the hitting impression deteriorates).
  • the rachis portion 14 also requires durability. When the durability of the rachis portion 14 is low, the root (the rachis portion 14 B near the flat surface of the base portion 2 ) of the rachis portion 14 becomes easy to break when the artificial feather shuttlecock 1 receives a strong impact force from the gut (string) like at the time of smashing. When the root of the rachis portion 14 breaks the artificial feather shuttlecock 1 cannot maintain the initial flying characteristic.
  • the rachis portion 14 needs to be not only lightweight, but also have high rigidity and high force of repulsion and also maintain durability.
  • fiber reinforced resin as material of the rachis portion 14 is well known.
  • glass reinforced resin is used as fiber reinforced resin, however, sufficient repulsion cannot be obtained, and its hitting impression is far from that of the natural feather shuttlecock.
  • reinforced resin using carbon fibers when carbon fibers are combined to an extent that sufficient hitting impression is obtained (sufficient rigidity can be obtained), the rachis portion becomes easy to break and there arises a problem in durability.
  • resin reinforced using glass fibers as well as carbon nanotubes are used as material of the rachis portion 14 .
  • the artificial feathers 10 With the rachis portion 14 being formed with resin including glass fibers and carbon nanotubes, the artificial feathers 10 will have high rigidity and high repulsion force, while maintaining durability. As a result, the artificial feather shuttlecock 1 having the artificial feathers 10 has durability as well as good hitting impressions.
  • carbon fibers In the case of combining the carbon fibers with the glass fibers in the resin, since the carbon fibers have generally a thickness of approximately 5 to 10 ⁇ m in diameter, unless a certain amount is combined they cannot be dispersed entirely in a uniform manner. With the combined grade of commercially available glass fibers and carbon fibers, carbon fibers are included by approximately 10%.
  • the carbon nanotubes dispersed in the resin contribute to improving the repulsion of the resin.
  • the carbon nanotube could be well dispersed in the resin, and an effect of improvement in hitting impression is obtained.
  • thermoplastic resin is used in a base material (matrix) of the resin combined with glass fibers and carbon nanotubes.
  • thermoplastic resin for example, polyamide resin, polyamide elastomer, polyolefin elastomer and the like can be used.
  • polyamide 12 nylon12, PA12
  • polyamide 12 nylon12, PA12
  • the carbon nanotubes to be included in the resin together with the glass fibers can be such as cup stack carbon nanotubes (CS-CNT), multi-walled carbon nanotubes (MW-CNT), single walled carbon nanotubes (SW-CNT).
  • CS-CNT cup stack carbon nanotubes
  • MW-CNT multi-walled carbon nanotubes
  • SW-CNT single walled carbon nanotubes
  • the carbon nanotubes to be included in the resin together with the glass fibers preferably include a functional group.
  • the carbon nanotubes with the functional group is obtained by modifying the carbon nanotubes with the functional group.
  • the functional group of the carbon nanotube with the functional group is preferably a functional group with high polarity and that is compatible with glass.
  • the functional group of the carbon nanotube with the functional group is preferably a functional group showing hydrophilicity.
  • the carbon nanotubes preferably include at least one of a carboxyl group and a hydroxyl group as the functional group.
  • Other functional groups for example, an amino group may be used as long as it is a functional group that is compatible with glass.
  • the carbon nanotubes that are to be included in the resin are preferably cup stack carbon nanotubes (CS-CNT).
  • the cup stack carbon nanotubes have a structure like multiple cups placed overlapping one another and have high strength and also flexibility. Thus, especially when the cup stack carbon nanotubes are used as carbon nanotubes to be included in the resin, the repulsion improves and the hitting impression improves.
  • the carbon nanotube content is preferably equal to or less than 0.4 weight %.
  • hitting impression can be improved without loss of durability. It is confirmed in the embodiment to be described later that the carbon nanotubes are preferably included in this range.
  • FIG. 6 is a chart showing the materials (and evaluation results) of the samples.
  • the shape of the artificial feather shuttlecock 1 in each of the samples are as shown in FIGS. 1 , 2 , 4 , and 5 , and are all the same (the shape, size, and weight and the like of the artificial feather shuttlecock that has not been explained follow the regulations of Nippon Badminton Association Rules).
  • the material of each of the samples are all the same, expect for the material of the rachis portion 14 .
  • the base material (matrix) of the resin to be the material of the rachis portion 14 is the same in all of the samples, and the material is 12 nylon (PA12).
  • GF in the chart refers to glass fibers. “GFn %” in the chart indicates that the content of the glass fibers is n weight %.
  • the mixing ratio of the reinforced fiber (glass fiber) of the reference sample is 20.0 weight %
  • the mixing ratio of the reinforced fiber (glass fiber, carbon fiber, carbon nanotube) of the other samples is 22.5 weight %.
  • CNT in the chart refers to carbon nanotubes.
  • CNT(1) in the chart is CS-CNT with a functional group (cup stack carbon nanotube, diameter of 50-80 nm, length of 0.82-1.08 ⁇ m).
  • CNT(2) in the chart is MW-CNT with a functional group (multi-walled carbon nanotube, diameter of 8-15 nm, length equal to or smaller than 2 ⁇ m).
  • CNT(3) in the chart is MW-CNT (diameter of 10-15 nm, length of 0.1-10 ⁇ m).
  • the functional group includes at least a carboxyl group and a hydroxyl group and the amount thereof is 1-10 weight %.
  • Reference Sample Glass reinforced resin including 20.0 weight % of glass fibers is prepared, the artificial feather 10 having the rachis portion 14 molded with this material is manufactured, and the artificial feather shuttlecock 1 manufactured using this artificial feather 10 is made as a reference sample.
  • the reference sample does not include reinforced fibers other than glass fibers (such as carbon fibers). Compared with the content of glass fibers in the standard sample (22.5 weight %), the content of glass fiber (20.0 weight %) in the reference sample is small.
  • Standard Sample Glass reinforced resin including 22.5 weight % of glass fibers is prepared, the artificial feather 10 having the rachis portion 14 molded with this material is manufactured, and the artificial feather shuttlecock 1 manufactured using this artificial feather 10 is made as a standard sample.
  • the standard sample becomes the standard in evaluating durability and hitting impression.
  • Sample A Resin including 22.3 weight % of glass fiber and 0.2 weight % of CS-CNT (with a functional group) is prepared, the artificial feather 10 having the rachis portion 14 molded with this material is manufactured, and the artificial feather shuttlecock 1 manufactured using this artificial feather 10 is made as sample A.
  • Sample B Resin including 22.3 weight % of glass fibers and 0.2 weight % of MW-CNT (with a functional group) is prepared, the artificial feathers 10 having the rachis portion 14 molded with this material is manufactured, and the artificial feather shuttlecock 1 manufactured using the artificial feathers 10 is made as sample B.
  • Sample C Resin including 22.3 weight % of glass fibers and 0.2 weight % of MW-CNT is prepared, the artificial feathers 10 having the rachis portion 14 molded with this material are manufactured, and the artificial feather shuttlecock 1 manufactured using the artificial feathers 10 is made as sample C.
  • Samples A to C all use resin including 22.3 weight % of glass fibers and 0.2 weight % of CNT as material of the rachis portion 14 . Samples A-C differ from each other in the type of the carbon nanotubes.
  • Sample D Resin including 22.1 weight % of glass fibers and 0.4 weight % of MW-CNT is prepared, the artificial feather 10 having the rachis portion 14 molded with this material is manufactured, and the artificial feather shuttlecock 1 manufactured using this artificial feather 10 is made as sample D.
  • Sample E Resin including 21.9 weight % of glass fibers and 0.6 weight % of MW-CNT is prepared, the artificial feather 10 having the rachis portion 14 molded with this material is manufactured, and the artificial feather shuttlecock 1 manufactured using this artificial feather 10 is made as sample E.
  • samples C-E resin including glass fibers and MW-CNT is used as the material of the rachis portion 14 .
  • Samples C-E differ from each other in content by percentage of MW-CNT.
  • Comparison Sample A Resin including 22.0 weight % of glass fibers and 0.5 weight % of carbon fibers is prepared, the artificial feather 10 having the rachis portion 14 molded with this material is manufactured, and the artificial feather shuttlecock 1 manufactured using this artificial feather 10 is made as comparison sample A.
  • Comparison Sample B Resin including 17.5 weight % of glass fibers and 5.0 weight % of carbon fibers is prepared, the artificial feather 10 having the rachis portion 14 molded with this material is manufactured, and the artificial feather shuttlecock 1 manufactured using this artificial feather 10 is made as comparison sample B.
  • FIG. 7A is a photograph taken of comparison sample A.
  • FIG. 7B is a photograph taken of sample C (In FIG. 7A and FIG. 7B , however, a white paper is inserted to the inner side of the skirt portion (the plurality of artificial feathers 10 that have been circularly arranged) so that the color of the rachis portion 14 can be grasped from the photograph).
  • the rachis portion 14 was confirmed to be a gray color. This is a state where the carbon fibers are not sufficiently dispersed over the entire resin, and the amount of the carbon fibers in respect to the resin is not enough (Therefore, as described later on, even though the carbon fibers are included in comparison sample A, the rigidity and repulsion of the rachis portion 14 has not improved, and the hitting impression has not improved.).
  • FIG. 7B (sample C including 0.2 weight % of MW-CNT), it is confirmed that the color of the rachis portion 14 is black (In sample A and sample B, the color of the rachis portion 14 is black).
  • the rachis portion 14 is black as a result of black carbon nanotubes being dispersed over the entire resin.
  • the vane supporting portion 14 A of the rachis portion 14 is put between the sheet form vane portions 12 and the sheet form reinforcing material 15 . Therefore, the black color of the vane supporting section 14 A of the rachis portion 14 cannot be easily visually identified from the outside, and it has been confirmed that the portion of the rachis portion 14 that looks black can be lessened.
  • FIG. 8A and FIG. 8B are photomicrographs of a cross section of the rachis portion 14 of sample B.
  • FIG. 8A is a photomicrograph of a section surface
  • FIG. 8B is a photomicrograph of the surface after the section surface has been partially melted with a solvent.
  • FIG. 8B can be said as showing the inside state of FIG. 8A , and from this photograph the manner in which the black carbon nanotubes are dispersed in the resin can be seen.
  • FIG. 3 shows evaluation results of durability and hitting impression of the samples.
  • a durability test was performed by repeating smashes for a predetermined number of times with an initial velocity of over 300 Km/h.
  • the evaluation of durability was performed by confirming the state of the shuttlecock in every smash hit and converting into numbers the occurrence time of an initial breakage (a state in which the shaft initially breaks).
  • a method is applied in which the state with no breakage after the predetermined number of times of smashes have finished is shown as “100”, and in the case where breakage occurs earlier than the predetermined number of times of smashes the rate of the number of smashes when the breakage occurred is shown. This time, the state with no breakage is set as the standard, therefore there is no sample with evaluations exceeding the standard sample.
  • the base portion 2 used in the evaluated shuttlecock uses natural cork. Natural cork maintains both qualities of lightness and good repulsion, but on the other hand due to natural cork being a natural raw material it has characteristics with a large variability. As a result, even in the case where the same type of rachis portion is used there is an individual variation. Thus, approximately 5% is within the margin of error, and those with an evaluation of durability that is equal to or greater than 96 are in the range with essentially no problems.
  • the range with the mean value equal to or greater than ⁇ 5 to ⁇ 4 or less is set as “very bad”
  • the range with the mean value equal to or greater than ⁇ 4 to ⁇ 2.5 or less is set as “bad”
  • the range with the mean value equal to or greater than ⁇ 2.5 to ⁇ 1 or less is set as “slightly bad”
  • the range with the mean value equal to or greater than ⁇ 1 to 1 or less is set as “normal”
  • the range with the mean value equal to or greater than 1 to 2.5 or less is set as “slightly good”
  • the range with the mean value equal to or greater than 2.5 to 4 or less is set as “good”
  • the range with the mean value equal to or greater than 4 to equal to or less than 5 is set as “very good”. Note that, it is also possible to evaluate hitting
  • the hitting impression was bad (slightly bad). This is considered to be because the amount of reinforced fibers (glass fibers) reinforcing the resin is small, the rigidity and repulsion of the rachis portion 14 became low.
  • comparison sample A compared with the standard sample, it has been confirmed that there was hardly any change in durability and hitting impression. As can be also confirmed from the photograph in FIG. 7A , this is considered to be because the amount of the carbon fibers in respect to the resin is insufficient.
  • samples A-E including the carbon nanotubes are described.
  • sample A to sample C improvement in the hitting impression has been confirmed.
  • sample A to sample C by including an extremely small amount (0.2 weight %) of carbon nanotubes, in contrast to the content (5.0 weight %) of the carbon fibers in comparison sample B, it is confirmed that an improved effect in the hitting impression can be obtained.
  • sample A to sample C deterioration of durability due to including the carbon nanotubes was not confirmed. In other words, in sample A to sample C, hitting impression improved without loss of durability as in comparison sample B.
  • sample A and sample B as compared with sample C, improvement in the hitting impression was significant.
  • Both sample B and sample C include MW-CNT, and both have carbon nanotubes satisfactorily dispersed in the resin (both have black rachis portions 14 as shown in FIG. 7B ), and when considering the point that there is a difference in whether or not there is a functional group, it is assumed that the carbon nanotube having the functional group contributes to further improvement in the hitting impression.
  • sample A including CS-CNT has good hitting impression, as compared with a sample including other types of carbon nanotubes.
  • sample C to sample E improvement in hitting impression was confirmed.
  • sample C to sample E there was not as much deterioration in durability as in comparison sample B.
  • the content of the carbon nanotubes in the material is preferably equal to or less than 0.4 weight % (note that, the content is more than 0 weight %).
  • the mean values of the hitting impression of sample C to sample E are high values compared to the standard sample, and sample D had the highest value. Therefore, it is assumed that in the case carbon nanotubes are included to reach 0.4 weight %, hitting impression can be improved in accordance with the content of the carbon nanotubes without loss of durability. It is assumed that when carbon nanotubes are included greater than 0.4 weight %, not only durability but also hitting impression may deteriorate. From these reasons, it is assumed that the content of carbon nanotubes in the material (resin including glass fiber and carbon nanotube) is preferably equal to or less than 0.4 weight %.
  • the carbon nanotubes in the material are included in the range of equal to or greater than 0.2 weight % and equal to or less than 0.4 weight %, it has been confirmed that high hitting impression can be achieved without loss of durability.

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US14/232,709 2011-08-19 2012-07-27 Artificial feather for shuttlecock, shuttlecock, and method of manufacturing artificial feather for shuttlecock Abandoned US20140155201A1 (en)

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JP2011179801A JP5941633B2 (ja) 2011-08-19 2011-08-19 シャトルコック用人工羽根、シャトルコック及びシャトルコック用人工羽根の製造方法
JP2011-179801 2011-08-19
PCT/JP2012/069120 WO2013027535A1 (fr) 2011-08-19 2012-07-27 Plume artificielle pour un volant de badminton, volant de badminton et procédé de fabrication d'une plume artificielle pour volant de badminton

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
US10576346B2 (en) * 2016-05-09 2020-03-03 Yonex Kabushiki Kaisha Artificial shuttlecock feather and shuttlecock
CN112206488A (zh) * 2020-10-16 2021-01-12 任冬冬 一种羽毛球生产制作用钩线打结设备
US11130035B2 (en) * 2019-08-28 2021-09-28 Victor Rackets Industrial Corp. Artificial shuttlecock
EP4353338A1 (fr) * 2022-10-14 2024-04-17 Victor Rackets Industrial Corporation Volant artificiel

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JP5976907B1 (ja) * 2015-08-17 2016-08-24 株式会社コスモ精機 バドミントン用シャトル
CN206896725U (zh) * 2015-12-25 2018-01-19 戴见霖 植毛装置
TWI750995B (zh) * 2021-01-13 2021-12-21 勝利體育事業股份有限公司 人造羽毛球與毛片及其製備方法

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JPS5969086A (ja) 1982-10-14 1984-04-19 ヤマハ株式会社 シヤトルコツク用羽根
US20070225426A1 (en) * 2006-03-24 2007-09-27 Nano-Proprietary, Inc. Nylon 11/Filler/Modifier Composites
JP4651051B2 (ja) * 2007-02-02 2011-03-16 美津濃株式会社 バドミントン用シャトルコック、シャトルコック用人工羽根およびそれらの製造方法
DE102008020135A1 (de) * 2008-04-22 2009-10-29 Bayer Materialscience Ag Reaktionsharz auf Basis eines ungesättigten Polyesters, radikalisch härtbaren Vinylverbindungen und Kohlenstoffnanoröhrchen
JP2010082160A (ja) * 2008-09-30 2010-04-15 Mizuno Corp バドミントン用シャトルコックおよびシャトルコック用ベース本体
JP5170459B2 (ja) * 2009-08-18 2013-03-27 美津濃株式会社 シャトルコック用人工羽根、バドミントン用シャトルコックおよびそれらの製造方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10576346B2 (en) * 2016-05-09 2020-03-03 Yonex Kabushiki Kaisha Artificial shuttlecock feather and shuttlecock
US11130035B2 (en) * 2019-08-28 2021-09-28 Victor Rackets Industrial Corp. Artificial shuttlecock
CN112206488A (zh) * 2020-10-16 2021-01-12 任冬冬 一种羽毛球生产制作用钩线打结设备
EP4353338A1 (fr) * 2022-10-14 2024-04-17 Victor Rackets Industrial Corporation Volant artificiel

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WO2013027535A1 (fr) 2013-02-28
EP2745883A4 (fr) 2015-06-03
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EP2745883A1 (fr) 2014-06-25
CN103842035B (zh) 2016-04-20
JP5941633B2 (ja) 2016-06-29

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