JPWO2013077183A1 - Badminton shuttlecock and method of manufacturing the same - Google Patents

Abstract

  Provided are a shuttlecock of badmint with good hitting performance and flight characteristics, improved durability and uniformity of quality, and a method of manufacturing the shuttlecock without using a solvent-based adhesive. A shuttlecock in which blades are implanted in a hemispherical base portion, and a blade shaft of the blades constituting the shuttlecock and a hemispherical base portion and / or a warp yarn portion are bonded with an ultraviolet curable adhesive Shuttle cock. This shuttlecock manufacturing method is a method in which an ultraviolet curable adhesive having a volatile solvent component of less than 5% by weight in an ultraviolet curable adhesive is placed on a hemispherical base portion of a badminton shuttlecock, and / Alternatively, after applying to the knitted yarn portion, ultraviolet rays are irradiated to cure the ultraviolet curable adhesive.

Description

  The present invention relates to a shuttlecock used in badminton in which a plurality of blades (including synthetic blades) are implanted in a hemispherical base portion to form a skirt portion, and a method for manufacturing the shuttlecock.

  As shown in FIG. 1, the badminton shuttlecock includes a hemispherical base portion 11 and a skirt portion 19 implanted therein. FIG. 1 is a longitudinal sectional view showing an embodiment of a badminton shuttlecock according to the present invention. However, the conventional badminton shuttlecock as a background art also differs in the type of adhesive used. Since there are similar structures, the structure of a conventional shuttlecock for badminton will be described with reference to FIG.

The hemispherical base portion 11 is generally made of an integrally molded product of foam such as natural cork, polyvinyl chloride (PVC), polyurethane, and polyolefin, and is usually covered with a synthetic leather 17.
The skirt portion 19 is formed by implanting the blade 16 of a water bird or a land bird into the hemispherical base portion 11 so that the blade portion 15 forms a skirt shape. Further, the blade shafts 14 of the blades 16 are connected to each other by the yarn 18.

  An artificial shuttlecock is also known in which artificial feathers of a similar shape made of synthetic resin such as nylon or polyolefin are similarly implanted in the hemispherical base portion instead of using waterfowl or landbird feathers. The blade shaft 14 is the blade shaft of a bird's blade, the blade portion 15 is formed of a synthetic sheet material such as plastic film, synthetic paper, non-woven fabric, and the blade shaft 14 and the blade portion 15 are both synthetic products. Are known. Hereinafter, the shuttlecock of the present invention is a shuttlecock used for badminton competition in which a plurality of blades are implanted in a hemispherical base portion, and a blade shaft 14 is connected to each other by a thread 18 to form a skirt portion. If so, the one using the above-described waterfowl or land bird blade, the blade shaft 14 is the blade shaft of the bird blade, the blade portion 15 is formed of a synthetic sheet, the blade shaft 14 and the blade portion 15 are both Any synthetic products are included.

  In these shuttlecocks, an adhesive is usually used in a portion 13 where the blade shaft 14 is implanted in the hemispherical base portion 11. Further, an adhesive is applied to the warp yarn 18 to reinforce the skirt portion. As this adhesive, a nitrocellulose-based adhesive having excellent adhesiveness and durability is currently used (Patent Document 1, Patent Document 2, and Patent Document 3).

  However, even a shuttlecock using a nitrocellulose adhesive does not satisfy the strength performance of the nitrocellulose adhesive sufficiently, and when used in badminton competition, it will take a relatively short time due to striking a strong smash. However, there is still a problem in terms of durability that the damage becomes remarkable and the flight characteristics are disturbed.

Nitrocellulose is usually used as a solvent-type adhesive dissolved in an ester solvent such as methyl acetate, ethyl acetate, or butyl acetate. The amount of the solvent exceeds 50% by weight of the entire adhesive, usually 70 to 80%. About% is used. In addition to ester solvents, solvents such as ketones, ethers, alcohols, aromatic hydrocarbons and the like are also used by appropriately mixing them. The use of such a solvent in the production process is not preferable because it causes deterioration of the working environment, an increase in the risk of ignition, and emission into the atmosphere. In particular, the solid content of the resin in the solvent-based adhesive is usually about 20 to 30% by weight. The solvent volatilizes when the adhesive is dried, and the volume (weight) decreases with respect to the coating amount. There is a problem that voids and defects are easily formed in the layer.
Furthermore, since the volatility of the solvent changes with the environmental temperature, there is a problem in terms of quality control.

JP-A-9-168619 Japanese Patent Laid-Open No. 11-57096 JP 2001-252383 A

  In order to solve the above-mentioned conventional problems, the present invention uses a UV-curing adhesive that does not contain a solvent or can be used in a very small amount even if it contains a solvent. A shuttlecock having improved durability and quality stability while maintaining the properties, and a method for manufacturing the same.

The shuttlecock for badminton of the present invention is a badminton shuttlecock in which a blade having a blade shaft is implanted in a hemispherical base portion, and the blade shaft is connected by a warp thread,
The planting portion and / or the overburden portion of the blade shaft on the hemispherical base portion are bonded with an ultraviolet curable adhesive.

  Here, “bonded with an ultraviolet curable adhesive” means that the ultraviolet curable adhesive is cured and bonded by irradiating the ultraviolet curable adhesive with ultraviolet rays.

  In addition, the badminton shuttlecock manufacturing method of the present invention includes a UV curable adhesive in which the volatile solvent component in the UV curable adhesive is less than 5% by weight of the blade shaft to the hemispherical base portion of the shuttlecock. It is characterized by irradiating with ultraviolet rays after being applied to the planting portion and / or the warp yarn portion to cure the ultraviolet curable adhesive.

  The present invention can provide a shuttlecock having improved durability and quality stability while maintaining flight characteristics and hitting performance equivalent to those of a conventional luxury shuttlecock and a method for manufacturing the same. In addition, according to the method for manufacturing a shuttlecock of the present invention, the solvent can be used without being used, or even if it is used, adhesion can be achieved with a very small amount of viscosity adjustment. Provided is a method for manufacturing a shuttlecock that can improve the discharge into the interior, and further improve durability and quality stability while maintaining the flight characteristics and hitting performance equivalent to those of a conventional luxury shuttlecock. I can do it.

The longitudinal direction sectional view showing one embodiment of the shuttlecock for badminton of the present invention. The external appearance photograph after the trial hit of the shuttlecock for badminton of Example 1 of this invention. The appearance photograph after trial hitting of the shuttlecock for badminton of Comparative Example 1.

Next, specific embodiments of the present invention will be described.
As described above, the shuttlecock of the present invention is an ultraviolet curable type that does not contain a solvent or has a very small amount of solvent as an adhesive for a portion planted on a base of a blade (blade shaft) and a chain yarn portion connecting the blade. Use glue. Use of UV curable adhesive can improve work environment, increase flammability risk, improve air discharge, and provide flight characteristics and hitting performance equivalent to those of conventional luxury shuttlecocks. It is possible to manufacture a shuttlecock with improved durability and stability of quality while maintaining it.

  According to the study by the present inventors, in order to improve the durability and feel of the shuttlecock obtained by applying the ultraviolet curable adhesive, pay attention to the hardness and elongation of the adhesive after curing. did. And it discovered that it was more preferable that the adhesive agent after hardening has moderate hardness and elongation.

  The hardness after hardening of the preferable adhesive agent in this invention is 35-85 D hardness by the durometer of JISK6253, and preferable elongation rate is 30-300%. Here, the elongation percentage represents the elongation percentage at break when the cured resin sheet was pulled using a JIS No. 2 dumbbell test piece under the condition of a pulling speed of 50 mm / min.

  By setting the D hardness to 35 to 85, the hardness after curing of the adhesive is not too soft, the durability (shuttle shape retention by impact) is not easily lowered, and the hardness is too hard. The feeling does not decrease. More preferable hardness is 40-75.

  On the other hand, when the elongation rate is set to a preferable elongation rate of 30% to 300%, the elongation rate is too small, and the cured film is less likely to be broken by the impact due to impact or to be broken. Durability is further improved. Moreover, since the elongation rate is too large and easily deforms, the problem of low durability is less likely to occur, which is preferable. A more preferable range of elongation is 40 to 200%.

  The basic composition of the ultraviolet curable adhesive used in the present invention comprises a polymerizable monomer, oligomer and photopolymerization initiator.

For the shuttlecock of the present invention, it is easy to obtain a cured product having the above-mentioned physical characteristics, and the polymerizable component of the ultraviolet curable adhesive having a good impact feeling of the shuttle such as resilience and high durability, preferably the following: Ingredients.
(A) Monomer having polymerizable hydroxyl group (—OH group) and / or carboxyl group (—COOH group) whose polymerizable main component is polyurethane (meth) acrylate (b) and further used as a polymerizable component if necessary

  Although it does not specifically limit as said polyurethane (meth) acrylate, It can obtain by making polyisocyanate, a polyol, and a hydroxyalkyl (meth) acrylate react.

  Examples of the polyisocyanate component include aromatic polyisocyanates such as tolylene diisocyanate and diphenylmethane diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, and alicyclic polyisocyanates such as isophorone diisocyanate.

  Examples of the polyol component include polyether polyol, polyester polyol, caprolactone-modified polyol, polyolefin-based polyol, and polybutadiene-based polyol.

  Examples of the hydroxyalkyl (meth) acrylate component include 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and hydroxybutyl (meth) acrylate.

  Although it does not specifically limit about the manufacturing method of a polyurethane (meth) acrylate, As an example, polyisocyanate and a polyol are added excessively by molar ratio at 30 degreeC-90 degreeC by inert gas atmosphere, stirring, reaction After the prepolymer is obtained, hydroxy (meth) acrylate is added thereto, and the residual isocyanate group of the prepolymer and the hydroxy (meth) acrylate are reacted at about 30 ° C. to 40 ° C. in an inert gas atmosphere. Can be obtained.

  The weight average molecular weight of the polyurethane (meth) acrylate used in the present invention is preferably 2000 to 40000. By setting the molecular weight within this range, the molecular weight is too small to reduce the soft component and the cured product does not become brittle, and the molecular weight is too large to reduce the ratio of reactive groups, resulting in poor curability. Of course, the molecular weight range is preferable.

  Here, the meaning of the main component in the expression “polymerizable main component is polyurethane (meth) acrylate” means that the polymerizable component in the ultraviolet curable adhesive is a large amount of the polymerizable component, and the ultraviolet curable type. Preferably 35 to 95 weight% in an adhesive agent, More preferably, about 35 to 80 weight% is mix | blended. When the content of the polyurethane (meth) acrylate is 95% by weight in the ultraviolet curable adhesive, it is not particularly limited, but the substantially polymerizable component is polyurethane (meth) acrylate alone, and the remaining 5 The weight% is a composition called a photopolymerization initiator, an auxiliary for the photopolymerization initiator, and other additives.

  A cured resin obtained mainly from polyurethane (meth) acrylate is particularly preferable for shuttlecocks because it has better resilience and higher shuttle feel and durability than other polymerizable oligomers such as polyester acrylate and polyether acrylate. I understood it.

  Next, the monomer (b) having a hydroxyl group (—OH group) and / or a carboxyl group (—COOH group) to be used in combination as the polymerizable component is not particularly limited. Examples of the monomer having a group) include hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate.

  Examples of the monomer having a carboxyl group (—COOH group) include dimer and trimer of (meth) acrylic acid in addition to acrylic acid and methacrylic acid.

  Since the durability of the shuttlecock is improved by the addition of these functional group-containing monomers, these functional group-containing monomers are preferably used in combination with polyurethane (meth) acrylate. The mechanism of its action is not necessarily clear, but the addition of these hydrophilic monomers can optimize the hydrophilic / hydrophobic balance such as solubility parameter (SP value), so that adherends such as blades, corks, and yarns are used. The effect which can improve the affinity with is considered.

  When the component (b) which is a monomer having a hydroxyl group (—OH group) or / and a carboxyl group (—COOH group) is used in combination, it is used in a proportion of about 3 to 30% by weight in the ultraviolet curable adhesive. Two or more types of monomers having these functional groups can be used in combination.

As other monomer components other than (a) and (b), various aliphatic alkyl (meth) acrylates, alicyclic alkyl (meth) acrylates, aromatic (meth) acrylates and the like may be used in combination as necessary. I can do it. Moreover, polyfunctional (meth) acrylate can also be used as needed.
These can be used for the purpose of solvent for the polymerization initiator, reactive diluent, adjustment of Tg, crosslinking and the like. These components can be used in an amount of about 0 to 30% by weight in the ultraviolet curable adhesive.

  In the present invention, "... (meth) acrylate" means "... acrylate or ... methacrylate", and similarly "(meth) acrylic acid" means "acrylic acid". Or “methacrylic acid”.

Next, the photopolymerization initiator is not particularly limited as long as it generates radicals by the action of light, and can be appropriately selected from known initiators and commercially available initiators. Examples include benzyl dimethyl ketal, 1-hydroxycyclohexyl phenyl ketone (trade name “Irgacure 184” Ciba Specialty Chemicals), benzophenone, benzoyl isopropyl ether, 4- (2-hydroxyethoxy) -phenyl (2-hydroxy-2-propyl) Ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, and the like.
These are preferably contained in the ultraviolet curable adhesive in an amount of about 1 to 5% by weight.

  If necessary, triethanolamine, dimethylaminobenzophenone, diethylaminobenzophenone, ethyl dimethylaminobenzoate, diethylthioxanthone and the like can be used in combination as an auxiliary of the photopolymerization initiator.

  In addition, a polymerization inhibitor, a filler, a reinforcing material, a matting agent, a stabilizer and the like can be blended as necessary.

  It is not preferable to add a solvent for the purpose of the present invention, and it is preferable that the solvent is not contained. However, if necessary, it should be added as an acceptable range if it is less than 5% by weight in the UV curable adhesive for adjusting the viscosity. You can also.

  In addition to the ultraviolet curing function, a catalyst and a monomer for adding anaerobic curing and heat curing functions can be added as necessary.

In the present invention, as described above, the ultraviolet curable adhesive preferably has a specific range for the viscosity of the ultraviolet curable adhesive in addition to the physical properties of the cured product and the components of the cured resin. 100 to 50000 mPa · s is preferably used. By setting the viscosity within this range, the viscosity is too small, so that there is no problem such as dripping of the adhesive-applied portion or penetration into the cork, and the viscosity is too large, the adhesive permeability and adhesion It is preferable without deteriorating the properties.
More preferably, it is 300-8000 mPa * s (25 degreeC). When the viscosity at 25 ° C. is 10,000 mPa · s or higher and the viscosity is high, it is desirable to apply and apply in a state where the viscosity is lowered to 10,000 mPa · s or less by heating.

  It does not specifically limit as an application | coating method of an adhesive agent, A dispenser, brushing, a roller, immersion, a spray etc. can be used suitably.

  The adhesive may be the same as or different in composition from the planted portion and the yarn. The planting portion is a portion indicated by reference numeral 13 in which the blade shaft 14 is inserted into the hemispherical base portion. The adhesive may be applied to only one of the planting portion and the overburden portion, but it is preferable to apply the adhesive to both. In addition, the adhesive of the warp yarn part is usually applied over almost the entire length of the warp yarn in order to prevent and reinforce the warp yarn in addition to the adhesion of only the intersection of the warp yarn and the blade shaft. Is preferred.

  The applied amount (attachment amount) of the ultraviolet curable adhesive is preferably 0.5 g to 1.5 g per shuttle by weight after curing of the adhesive. Since the durability is too low when the amount is too small, and the amount is too heavy and does not affect the flight characteristics, the above range is preferable as the applied amount (adhesion amount) of the adhesive. Especially preferably, it is 0.7-1.3g.

The method of curing the ultraviolet curable adhesive is not particularly limited, but ultraviolet rays can be irradiated by irradiating about 10 to 3000 mJ / cm ² using a high pressure mercury lamp, a metal halide lamp, a xenon lamp or the like that emits light in the wavelength range of 150 to 450 nm. The curable adhesive can be cured.

  The shuttlecock material that can be applied to the present invention is not particularly limited, and the blade portion can be applied not only to waterfowl such as eagle birds, but also to natural feathers such as land birds, and artificial feathers using synthetic paper such as aramid and polyolefin. The hemispherical base material can be applied to cork, cork powder, a mixture of granular material and resin, synthetic foamed resin as a substitute for cork, and the like. Further, the warp yarn can be applied to various natural fibers such as cotton yarn, polyester yarn, polyvinyl alcohol yarn, polyamide yarn, and synthetic fiber yarn.

  Preferably, the spun yarn is preferably used as the warp yarn from the viewpoint of the retention and durability of the adhesive resin. The place where the warp yarn is attached is not particularly limited, but normally, as shown in FIG. 1, it may be provided in two places, an upper part below the blade part 15 of the blade shaft part 14 and an intermediate part. Although it is preferable, for example, three locations may be provided as necessary.

  As described above, it is more desirable that the adhesive is bonded to both the base portion and the wing shaft portion and the warp yarn by using the ultraviolet curable adhesive of the present invention.

  The present invention provides a shuttlecock for badminton with improved durability and quality uniformity in addition to the ball hitting characteristics and flight characteristics of the product, and a method for manufacturing the same, and without using a solvent-based adhesive in the manufacturing process. In addition to improving and resolving problems caused by the use of solvents such as work environment deterioration, fire hazard, and release to the atmosphere, badminton has improved durability and quality uniformity in addition to product shot characteristics and flight characteristics. It can be set as the manufacturing method of the shuttlecock for water.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the examples are for illustrative purposes only, and the present invention is not limited only to these examples. Absent.

Example 1
A high-quality eagle bird feather and hemispherical cork for the base were prepared for the badminton shuttlecock. Sixteen inclined holes for planting the blade shaft were drilled on the same circumference on the surface of the blade shaft fixing portion of the base. Then, 16 wings of feathers were planted in a skirt shape as shown in FIG.

Next, a polyester spun four-ply twisted yarn (20 s / 4) is used as the warp yarn, and the 16 wings of the wings are arranged between the upper portion below the blade portion 15 of the blade shaft portion 14 and the intermediate portion as shown in FIG. Each blade shaft part was connected and fixed at two locations of the part. The ultraviolet curable adhesive of the present invention was applied to the planted blade shaft portion and the peripheral portion of the yarn with a dispenser and a brush, and then UV-irradiated with a high-pressure mercury lamp to cause reaction curing (irradiation conditions; 80 W / cm, main Wavelength 365 nm, irradiation distance about 15 cm, integrated light quantity 30 KJ / m ² ). The adhesion amount of the ultraviolet curable resin after curing was 1.08 g in total.

  The composition of the UV curable adhesive used was 50% by weight of polyester polyurethane acrylate, 25% by weight of alicyclic acrylate (isoboronyl acrylate), 17% by weight of hydroxyethyl methacrylate, 3% by weight of hydroxypropyl acrylate, light The polymerization initiator and others are 5% by weight. The viscosity of this adhesive was 1600 mPa · s (25 ° C.). The hardness of the resin sheet of the ultraviolet curable adhesive that was cured by reaction under the same irradiation conditions was 60, and the elongation was 100%.

(Comparative Example 1)
The same material as in Example 1 was used except for the adhesive, and a nitrocellulose-based adhesive (main solvent; ethyl acetate, butyl acetate resin solid content 20% by weight) was applied to the same part as in Example 1 as an adhesive. The attached amount of nitrocellulose-based resin after drying was 1.02 g.

(Comparative Example 2)
A commercially available shuttlecock for badminton (“GF50” manufactured by Gossen Co., Ltd., Japan Type 2 Badminton Association certified ball) was used. This product uses a nitrocellulose adhesive as an adhesive.

  Using the badminton shuttlecock of Example 1 and the badminton shuttlecocks of Comparative Examples 1 and 2, trial strike evaluation was conducted by two high-level players. Although the shuttlecock of Comparative Example 1 was disturbed by a 10-minute rally (including 50 smashes), the shuttlecock of Example 1 performed a similar 10-minute rally. There wasn't. The state of the shuttle at this time is shown in FIG. 2 and FIG. 3 (photograph). FIG. 2 shows the shuttlecock of Example 1, and FIG. 3 shows the shuttlecock of Comparative Example 1. The blade shape of the shuttlecock of Comparative Example 1 was considerably found.

In addition, the blade portion of the shuttlecock for badminton of Comparative Example 1 after the test hit had 10 blades out of 16 blades having large deformation such as breakage, cracking of the blade shaft, partial breakage of the blade portion, and dropout. (Durability determination: ○ ·· This was used as a comparative standard.)
On the other hand, in the badminton shuttlecock of Example 1 after the test hit, two of the 16 blades with large deformation such as the blade shaft cracking or the blade portion being separated from the blade shaft (endurance determination; ○ ~ ◎ better than comparative products).

  Further, when a force is applied so as to crush the shuttlecock from the lateral direction while holding the central portion of the shuttlecock after the test hit, the blades of Example 1 are almost the same as before the test hits, whereas the blades of Comparative Example 1 are more easily deformed than before the test hits. For this reason, it is presumed that the blades were deformed by hitting, resulting in turbulence in flight and partial loss of the blades. Although the shuttlecock of the comparative example 2 is slightly better than the shuttlecock of the comparative example 1 (breakage of the shuttlecock after the trial hit, deformation is 8 out of 16 and the durability judgment is ◯; comparable to the comparative example), the implementation of the present invention The shuttlecock of Example 1 was more durable. The hit feelings were all good and there was no big difference.

(Example 2)
As an ultraviolet curable resin component, an ultraviolet curable resin liquid (viscosity 1000 mPa · s (25%) composed of 60% by weight of polyether-based polyurethane dimethacrylate, 30% by weight of hydroxyethyl methacrylate, 5% by weight of acrylic acid, and 5% by weight of a photopolymerization initiator. A shuttlecock was manufactured in the same manner as in Example 1 except that [deg.] C)) was used. The cured resin had a hardness of 50 and an elongation of 130%. The amount of adhered resin was 0.91 g.
As a result of performing a test hitting test similar to the above-described Examples and Comparative Examples using this shuttlecock, the shuttlecock after the test hit was damaged and deformed by 3 out of 16 (endurance determination; from Comparative Examples) Good).

(Examples 3 and 4)
UV curing resin liquid (Example 3) consisting of 90% by weight of polyester polyurethane diacrylate, 5% by weight of isobornyl acrylate, and 5% by weight of photopolymerization initiator as the UV curing resin component (viscosity is 40,000 mPa · s at 25 ° C.) A shuttlecock was manufactured in the same manner as in Example 1 except that it was heated to 50 ° C. and applied in the state of 6000 mPa · s. The cured resin had a hardness of 40 and an elongation of 85%. The amount of adhered resin was 1.11 g.

Further, as an ultraviolet curable resin component, an ultraviolet curable resin liquid (Example 4) comprising 75% by weight of the polyester polyurethane diacrylate, 15% by weight of hydroxyethyl methacrylate, 5% by weight of acrylic acid, and 5% by weight of a photopolymerization initiator (Example 4) A shuttlecock was manufactured in the same manner as in Example 1 except that the viscosity was 3000 mPa · s (25 ° C.). The cured resin had a hardness of 50 and an elongation of 85%. Moreover, the amount of adhesion resin was 0.95g.
As a result of performing a test hitting test similar to the above using this shuttlecock, the shuttlecock after the test hit was damaged or deformed in 7 of 16 in Example 3 (the endurance judgment was ◯; as in Comparative Example). The durability was evaluated as ◯ to ◎, which was better than the comparative example. From this result, it can be seen that the addition of the OH group-containing monomer (hydroxyethyl methacrylate) increases the durability.

(Comparative Example 3)
In place of the UV curable adhesive of Example 1, a cyanoacrylate adhesive (ThreeBond “TB1743”, viscosity 100 mPa · s (25 ° C.)) was used as a solvent-free adhesive. Granted and created a shuttlecock. The hardness of the cured resin was 90, the elongation was less than 2%, and the adhesion amount was 1.03 g. When this shuttlecock was struck, two portions of the warp yarn were cut in four smashes. (Durability determination; x inferior to Comparative Example 1) Since the cured resin is hard and brittle, it is considered weak against impacts such as impact.
These results are summarized in Table 1.

  The present invention can provide a shuttlecock for badminton and a manufacturing method thereof, which can further improve durability and stability of quality while maintaining flight characteristics and hitting performance equivalent to those of a luxury shuttlecock used in badminton competition, and sports equipment. Is available for production.

11 Hemispherical base portion 13 Planting portion 14 Blade shaft 15 Blade portion 16 Blade 17 Synthetic leather 18 Overlock yarn 19 Skirt portion 20 Shuttle cock

A shuttlecock for badminton according to the present invention has a blade having a blade axis implanted in a hemispherical base portion, and the blade shaft is a badminton shuttlecock connected by a warp thread, The planted portion on the hemispherical base portion and / or the knitted yarn portion is bonded with an ultraviolet curable adhesive containing polyurethane (meth) acrylate as a main component, and the resin after curing of the ultraviolet curable adhesive The JIS K 6253 has a D hardness of 40 to 75 (excluding 75) .

The badminton shuttlecock manufacturing method of the present invention is a badminton shuttlecock manufacturing method in which a blade having a blade shaft is implanted in a hemispherical base portion, and the blade shaft is connected by a warp thread. A badminton shuttle comprising an ultraviolet curable adhesive containing as a main component a polyurethane (meth) acrylate that does not contain or contains less than 5% by weight of a volatile solvent component in the ultraviolet curable adhesive. It is characterized in that the ultraviolet curable adhesive is cured by irradiating with ultraviolet rays after being applied to the planting portion of the blade shaft on the hemispherical base portion of the cock and / or the warp yarn portion.

On the other hand, when the elongation rate is set to a preferable elongation rate of 30% to 300% , the cured product is less likely to be broken or torn by impact due to impact, and the durability of the obtained shuttlecock is further increased. improves. Moreover, since the elongation rate is too large and easily deforms, the problem of low durability is less likely to occur, which is preferable. A more preferable range of elongation is 40 to 200%.

Claims (9)

A blade having a blade shaft is implanted in the hemispherical base portion, and the blade shaft is a shuttlecock for badminton that is connected by a warp thread,
The shuttlecock for badminton, wherein the planted portion and / or the overburden portion of the blade shaft on the hemispherical base portion are bonded with an ultraviolet curable adhesive.   2. The shuttlecock for badminton according to claim 1, wherein the ultraviolet curable adhesive has an elongation percentage of a cured resin of 30 to 300% and a D hardness of JIS K 6253 of 35 to 85. 3.   The shuttlecock for badminton according to any one of claims 1 to 2, wherein the ultraviolet curable adhesive is an adhesive containing polyurethane (meth) acrylate as a main component.   The shuttlecock for badminton according to any one of claims 1 to 3, wherein the applied amount of the ultraviolet curable adhesive is a dry weight after curing, and is 0.5 to 1.5 g per shuttlecock for badminton. .   The ultraviolet curable adhesive contains polyurethane (meth) acrylate as a main component, and further contains a monomer having a hydroxyl group (—OH group) and / or a carboxyl group (—COOH group). The shuttlecock for badminton according to claim 1. A blade having a blade shaft is implanted in the hemispherical base portion, and the blade shaft is a method for producing a shuttlecock for badminton that is connected by a warp thread,
After applying an ultraviolet curable adhesive having a volatile solvent component of less than 5% by weight to the hemispherical base part of the badminton shuttlecock and / or the shaved yarn part. The method for producing a shuttlecock for badminton according to any one of claims 1 to 5, wherein the ultraviolet curable adhesive is cured by irradiating ultraviolet rays.   The method for producing a shuttlecock for badminton according to claim 6, wherein the ultraviolet curable adhesive is an ultraviolet curable adhesive containing no volatile solvent component.   The method for producing a shuttlecock for badminton according to any one of claims 6 to 7, wherein the ultraviolet curable adhesive has a viscosity of 100 to 50,000 mPa · s (25 ° C).   The shuttlecock for badminton according to any one of claims 6 to 8, wherein the applied amount of the ultraviolet curable adhesive is 0.5 to 1.5 g per badminton shuttlecock in terms of a dry weight after curing. Manufacturing method.