JP2013240548A - Table tennis racket, table tennis blade and method for measuring thickness of rubber bonded to table tennis blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a table tennis blade for which rubber is not easily peeled off, glue remains little when exchanging the rubber, and the thickness of the rubber bonded to the table tennis blade can be accurately measured, and a method for easily measuring the thickness of the rubber, while it is needed to frequently change the rubber for a table tennis racket and the thickness is sometimes changed by an adhesive or the like used when exchanging the rubber even while the upper limit of the thickness of the rubber is determined to be 4 mm under an international rule.SOLUTION: A table tennis blade is a blade for a table tennis racket which configures the table tennis racket by bonding rubber to a planar table tennis blade, and on a surface of the blade, a conductive layer is provided at least partially on the blade surface, and further, an insulating film layer having the thickness of 0.5-25 μm is provided. A method for measuring the thickness from a rubber surface to the surface of the conductive layer fixed to at least a part on the blade surface by an electromagnetic type or eddy current type measuring instrument is used.

Description

  The present invention relates to a table tennis blade having a conductive layer, a table tennis racket to which rubber is adhered, and a method of measuring the thickness from the rubber surface of the table tennis racket to the adhesive layer, and more particularly, to an electromagnetic film thickness meter or eddy current of the table tennis racket rubber. The present invention relates to a simple measurement method using a film thickness meter.

  Conventionally, table tennis rackets (hereinafter simply referred to as rackets) used in table tennis competitions such as the Japanese championship, national polity, and even world championships are used for table tennis rackets (hereinafter simply referred to as blades) and rubber for table tennis rackets (using an adhesive). Hereinafter, it is common to simply use rubber). By selecting a combination of rubber and blade, adhering them and using them as a racket, the speed and rotation rate of the ball can be adjusted. This makes it possible to optimize the racket according to the competition situation.

  The table tennis racket rubber is used not only in competitions but also in practice, so it is worn out or worn out and further deteriorates. Therefore, in order to maintain the performance as a table tennis racket, it is necessary to replace the rubber frequently.

  Patent Document 1 describes the use of an adhesive using a volatile organic solvent such as toluene or heptane as an adhesive used for rubber replacement. For example, as an adhesive for rubber of table tennis rackets, an adhesive in which about 0.2 CC of rosin ester is added to natural rubber 4.8 CC and heptane 950 CC has been proposed.

  However, these volatile organic solvents generate a volatile organic compound (hereinafter referred to as VOC) immediately after rubber adhesion, and are harmful to the human body. For this reason, the adhesive which does not contain VOC is calculated | required as an adhesive agent used for rubber | gum sticking.

  As an adhesive not containing VOC, a rubber-based aqueous adhesive is conventionally known. However, in the case of bonding only with the water-based adhesive, there is a case where the bonding between the rubber and the blade is not uniform and the bonding force is insufficient. In order to reinforce the adhesive force, a method of mixing and using a water-based adhesive is known.

  For example, Patent Document 2 discloses an aqueous table tennis water containing a latex composed of one or more selected from the group consisting of natural rubber latex, modified natural rubber latex and isoprene (synthetic natural rubber) latex, and an adhesion-imparting resin. A method using an adhesive has been proposed.

Patent Document 3 discloses that polyisoprene is 25 to 62% by weight as a pure component, rosin ester resin is 0.5 to 10% by weight as a bonding auxiliary component, and mannitol as a filler is 0.5 to 5% as a pure component. A table tennis adhesive containing 10% by weight of water other than these is described.
JP 2002-97433 A JP 2007-284573 A JP 2008-110145 A

  However, these table tennis adhesives have a problem of adhesive residue. The rubber replacement is performed by peeling off the rubber attached to the blade and attaching a new rubber using an adhesive. In general, the surface of the blade is made of natural wood. For this reason, when a water-soluble adhesive is used, it becomes difficult to penetrate and remove the surface of the wood (adhesive residue). When the next rubber is applied with the glue remaining, the rubber surface may become uneven, or the adhesive strength of some parts may become abnormally strong and the rubber on the blade base material may be peeled off together. is there.

  In order to solve these problems, it is possible to improve the affinity between the water-based adhesive and the hydrophobic (lipophilic) surface of rubber, and further modify the rubber surface to give better performance. Agents (primers) have been proposed. Patent Document 4 describes the use of vegetable oil as an adhesion aid (primer).

  In Patent Document 5, an organic solvent mainly composed of alkane having 11 to 14 carbon atoms or a mixture thereof when adhering using concentrated rubber latex and acrylic resin emulsion is used as an adhesion aid (primer). The method used as is described.

  However, as described above, these primers have low volatility but have persistence, and the remaining primer reduces the adhesion between the rubber and the blade. The rubber is easily peeled off from the periphery of the racket and is generally protected by edge tape or the like for the purpose of preventing peeling. Further, taping at the peripheral part delays drying of the adhesion auxiliary agent (primer), and thus there is a problem that it is difficult to improve the adhesive strength.

  Further, according to the International Table Tennis Competition Rules, the rubber thickness including the adhesive layer from the blade surface is set to an upper limit of 4 mm. In general, it is preferable to use a thick rubber in order to increase the speed of the hit ball and hit it back stably. When the rubber uses the volatile / nonvolatile organic solvent-based adhesive or primer, it may swell by absorbing the organic solvent. There is a problem that there is a risk of being disqualified in the competition because it exceeds the upper limit of 4 mm depending on the components and amount of the organic solvent contained in the adhesive and the adhesion assistant. This problem may also occur with low molecular weight components and additives contained in adhesives and the like.

  In order to use the racket in competitions based on the international table tennis rules, the rubber thickness including the adhesive layer from the blade surface must not exceed 4 mm. Therefore, it is necessary to accurately measure the rubber thickness just before the competition in a state where it is attached to the blade. In the case of using the organic solvent system or the adhesion assistant, the rubber thickness can be affected by swelling after adhesion.

  Conventionally, as a method of measuring the thickness of the rubber stuck to the blade, a method of visually measuring the rubber cross section with a scaled loupe or the like has been performed. However, the rubber is used by competitors cut out according to the size and shape of the blade. Therefore, the rubber thickness is affected by the angle of the cut surface and the state of the cross section, and accurate measurement is difficult.

  Moreover, in order to suppress the peeling of rubber from the peripheral portion, there is a problem that the measurement is further difficult when a rubber peeling preventing tape (edge tape) is used in the peripheral portion of the racket. There is a problem that it is difficult to confirm even when the rubber thickness changes from the blade surface to the rubber thickness including the adhesive layer exceeds 4 mm due to swelling after the adhesion.

As described above, a rubber using a water-soluble adhesion aid for a conventional wooden blade is difficult to peel off and has a problem of adhesive residue. In addition, rubber using an organic solvent as an adhesion aid or the like is difficult to improve adhesive strength. As a blade other than wooden, for example, in Patent Document 6, a titanium thin plate having a thickness of about 0.2 mm is formed in the shape of a blade on the blade outer plate in order to exert a strong hitting repulsion force on the table tennis blade. Yes. However, although these rackets are less than the blades on the wooden surface, there is a problem that adhesive residue is generated and the feel at impact is further changed.
JP 2006-51328 A JP 2009-189394 A JP 2005-118223 A

  The present invention provides a table tennis plate that has a small amount of adhesive residue when changing rubber, is difficult to peel off the rubber stuck on the table tennis blade, and can accurately measure the rubber thickness adhered to the table tennis blade. The present invention also relates to a method for supplying table tennis rackets and simply measuring the thickness of rubber.

  A first invention is a table tennis racket blade comprising at least a blade base material and a conductive layer and constituting a table tennis racket by adhering rubber, and the table tennis blade has a conductive layer on at least a part of the surface thereof. The conductive layer is a table tennis blade having an electrical conductivity of 10,000 (S / m) or more and an average thickness of 1 to 50 μm.

  The second invention has a conductive layer on at least a part of the surface of a table tennis racket blade, the conductivity of the conductive layer is 10,000 (S / m) or more, and the average thickness is 1 to 50 μm. A table tennis racket in which a rubber is bonded to a blade, and the thickness from the rubber surface to the conductive layer is 1.5 to 4.0 mm.

  The third invention is a method of measuring the thickness from the rubber surface to the surface of the conductive layer fixed on the blade surface with an electromagnetic film thickness meter or an eddy current film thickness meter in the table tennis racket. It is characterized by that.

  A table tennis racket is formed using a table tennis racket blade composed of a blade base material and a conductive layer, and the thickness of the rubber can be measured without peeling off the rubber. Furthermore, by providing an insulating film layer on the conductive layer, a table tennis racket can be obtained in which there is little adhesive residue at the time of rubber replacement and the rubber is difficult to peel off.

A preferred embodiment of the present invention will be described with reference to FIGS. The blade in the embodiment is a normal blade, but can be applied to both a shake hand type for double-sided ball hitting and a pen holder type for single-sided ball hitting.
An insulating film layer having a thickness of 0.5 to 25 μm and an elastic modulus of 0.5 to 10 GPa is preferably further laminated on the table tennis blade having the conductive layer. In addition to the protective effect of the thin conductive layer, the adhesive residue is suppressed during rubber replacement. When the elastic modulus of the insulating film layer is suitable, the shot feeling does not change. FIG. 1 shows a laminate sheet in which a conductive layer and an insulating film layer are laminated, and an adhesive layer is previously provided on the conductive layer and the insulating film layer, the adhesive surface of the conductive layer with the blade and the adhesive surface of the insulating film layer and the rubber surface. The form of is shown.

  More specifically, in FIG. 1, (a) and (g) are seals in which a conductive layer coated with an adhesive on both sides and an insulating film layer are integrated, and (a) and (g) are release papers. is there. The integrated seal is preferably formed by laminate molding. (H) The blade substrate and (e) the conductive layer are bonded together with (f) a strong adhesive layer.

In the present invention, when an integrated seal is used, (b) the light adhesive layer is bonded so as to be the surface of the (c) insulating film layer. The rubber (b) is a light adhesive layer and is bonded to the (c) insulating film layer, but requires frequent replacement. For this reason, it is preferable that (c) the insulating film layer and the rubber are bonded with a light adhesive that easily peels after the second time.
(B) When bonded with a light adhesive layer using a double-sided adhesive sheet, after the rubber is peeled off, the adhesive with the subsequent rubber is removed by removing the (b) light adhesive layer of the double-sided adhesive sheet, and an adhesive for table tennis rubber (B) It is more preferable to form a light adhesive layer and bond it to rubber.
On the other hand, since (h) the blade base material and (e) the conductive layer do not need to be peeled off, it is preferable that (f) the strong adhesive layer be bonded.

  A method of attaching (b) to (f) to the blade (h) will be described. First, (g) part of the release paper in FIG. 1 is peeled off, and the (f) strong adhesive layer on the conductive layer side is lightly adhered to the blade to determine the position. Next, the conductive layer is sufficiently adhered to the blade by pressing strongly from the insulating film layer side (a) release paper, and then the remaining (a) release paper is peeled off and adhered. This method is preferable because the conductive layer can be easily formed on the blade without causing wrinkles or breakage.

  The above (b) light adhesive layer and (f) strong adhesive layer need not affect the feel at impact. Their preferred thickness is 1 to 100 μm, more preferably 5 to 50 μm. It is preferably formed to have a uniform thickness, is in close contact with the substrate, and does not contain foreign matter or air.

  (H) In order to laminate the conductive layer on the blade base material, the conductive layer is adhered to the smooth surface of the blade and rubber is adhered, and the conductive layer is adhered to the foam surface on the back side of the rubber and adhered to the blade base material. However, it is preferable to adhere to the smooth surface of the blade because it is easy to form a smooth conductive layer. Alternatively, the conductive layer may be embedded in the blade layer so that the surface of the blade layer and the position of the conductive layer are on the same plane.

  More specifically, a method in which a thin sheet of conductive metal is adhered to a smooth surface of a blade using an adhesive, a method in which a metal powder is formed using a paste or paint, There are methods such as vapor deposition plating, but the adhesive residue is reduced when changing rubber, and the thickness of the rubber can be measured accurately, so a thin sheet of metal is adhesively bonded to the smooth surface of the blade using an adhesive or adhesive. Is preferred. By sticking both surfaces of a thin metal sheet to form a double-sided adhesive sheet, it is possible to attach rubber to the blade without using another adhesive.

  The average thickness of the conductive layer of the present invention is 1 to 60 μm, preferably 3 to 40 μm, more preferably 5 to 30 μm. When the thickness of the conductive layer is less than 1 μm, it may be difficult to measure the rubber thickness with an electromagnetic film thickness meter or an eddy current film thickness meter. When the thickness exceeds 60 μm, the shot feeling of the blade itself changes. As the weight of the blade increases, the feeling of swinging may change. Since the measurement is simple, measurement with an electromagnetic film thickness meter is more preferable.

  The conductivity of the material forming the conductive layer of the present invention is 10,000 (S / m) or more, preferably 100,000 (S / m) or more. When the conductivity of the material forming the conductive layer on these insulating films is less than 10,000 (S / m), it is difficult to measure the rubber thickness with an electromagnetic or eddy current film thickness meter. .

  As a material for forming the conductive layer used in the present invention, gold, silver, copper, aluminum, magnesium, tungsten, cobalt, zinc, nickel, brass, iron, platinum, tin, chromium, lead, titanium, manganese, stainless steel And carbon. A conductive layer is formed by sticking or applying a conductive layer to a blade substrate. Among these materials, silver, copper, and aluminum are preferable because they can be easily foil-processed. Furthermore, aluminum which is easy to integrate with an insulating film layer such as PET and vapor deposition or lamination and has a low specific gravity is preferable.

  The conductive layer of the present invention preferably has an insulating film layer having an elastic modulus of 0.5 to 10 GPa. The insulating film layer is preferably adhered to the upper part of the conductive layer of the blade base material. By adhering to the upper part, adhesive residue can be reduced when the rubber is replaced, and damage to the conductive layer and occurrence of peeling can be prevented.

  The elastic modulus of the insulating film layer laminated on the conductive layer used in the present invention is 0.5 to 10 GPa, preferably 1 to 8 GPa. When an insulating film layer having an elastic modulus of 0.5 to 10 GPa is used, there is little risk of breakage when affixed to the blade, the conductive layer can be protected during rubber replacement, and a suitable shot feeling can be obtained. .

The thickness of the insulating film layer used in the present invention is 0.5 to 25 μm, preferably 1 to 20 μm, more preferably 1 to 15 μm.
When a film exceeding 25 μm is used, the shot feeling may change.

  Examples of the material for the insulating film used in the present invention include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, polyamide, and polycarbonate. Among these, polyethylene, polypropylene, and polyethylene terephthalate are preferable, and polyethylene terephthalate is more preferable. These insulating films not only make it possible to accurately measure the thickness from the rubber surface to the conductive layer with an electromagnetic or eddy current film thickness meter, but also provide a good shot feeling due to the favorable elastic modulus of the material. Hard to change.

  As a method for forming the conductive layer and the insulating film layer of the present invention as a laminate, a method generally used for lamination, such as a method of bonding using an adhesive, a heat seal method, a melt extrusion method, or the like is used. I can do things. Furthermore, in order to form a conductive layer, it is preferable to form a laminate of a metal foil having a thickness of 1 μm or more, which is adhesively bonded on one side, on a blade base material having a smooth surface. The rubber-bonded surface of the insulating film is preferably subjected to a printing process, a blasting process, or an anchor coating process. The balance between adhesiveness and adhesive residue can be optimized by the treatment.

  The laminate of the conductive layer and the insulating film layer preferably has an adhesive layer on the surface of the conductive layer in order to attach the conductive layer and the insulating film layer to the blade base material. It is preferable to affix together with the insulating film layer. Furthermore, it is more preferable that the surface of the adhesive layer is protected with a release paper, and after the release paper is peeled off, the adhesive layer is adhered to the blade because a smooth conductive layer can be formed.

  A double-sided adhesive sheet can be used for forming the adhesive layer. The double-sided adhesive sheet has a strong adhesive layer for adhering to the rubber on one side in addition to what is marketed for table tennis rubber adhesion, and a weak adhesive for adhering to the racket plate on the other side A well-known thing, such as what was provided with the adhesive bond layer which has a layer, can be used. Furthermore, an adhesive layer can be provided on both the front and back sides of the conductive layer, and used as a double-sided adhesive sheet.

  By attaching the conductive layer and the insulating film layer to the blade base material, the rubber can be bonded onto the smooth insulating film layer. By forming a conductive layer on the blade base material and further covering it with an insulating film layer, compared to the case where rubber is adhered directly to the surface of natural wood, it prevents adhesive residue during rubber replacement and at the same time damages the blade. It becomes possible to prevent.

  In order to form a smooth conductive layer, it is necessary to make the blade smoother. If the blade is new, it can be used as is. When the blade is not new, it is necessary to remove the rubber and remove the adhesive residue on the surface. For removal, it can be removed with a tool such as a scraper after swelling and dissolving with a solvent. If necessary, it may be polished with an abrasive or sandpaper. The rubber is bonded by uniformly applying a rubber bonding adhesive to the blade base material on which the conductive layer is laminated, or by a double-sided adhesive sheet.

  The table tennis rubber adhesive is preferably an aqueous adhesive free from harmful volatile substances. One concentrated rubber latex constituting the water-based adhesive is usually a rubber latex having a rubber content of about 30% by mass, and a rubber content of 60% by mass by means of centrifugation, heat evaporation, electric gradient method, dialysis or the like. Those concentrated to the extent are generally used because of their strong adhesive strength.

  As the adhesive for rubber, a solvent-based adhesive can be used, but an aqueous adhesive or a double-sided adhesive sheet that does not contain harmful volatile substances is preferable. One concentrated rubber latex constituting the water-based adhesive is usually a rubber latex having a rubber content of about 30% by mass, and a rubber content of 60% by mass by means of centrifugation, heat evaporation, electric gradient method, dialysis or the like. Those concentrated to the extent have strong adhesive strength and are generally used.

  When an aqueous adhesive is used, a primer can be applied in advance to the rubber sticking surface. Apply a primer and let stand for about a few minutes, then apply a water-based adhesive mainly composed of a mixture of concentrated rubber latex and acrylic resin emulsion on each side of the racket and rubber. Then, by bonding them together, the volatilization amount of the organic solvent can be remarkably reduced, and the racket and the rubber can be reliably bonded in a short time.

  An organic solvent may be used for the primer, but the volatilization amount of the organic solvent can be reduced by selectively using an organic solvent having a low volatility and a high boiling point or flash point.

  The aqueous adhesive may be adjusted in viscosity with a thickener in order to improve workability when the adhesive is applied to rubber or a racket. The viscosity is preferably 50 CPs to 50000 CPs, and particularly preferably 1000 CPs to 20000 CPs. If it exceeds 50,000 CPs, it may not stretch well when applied, and it may be difficult to apply uniformly, and if it is less than 50 CPs, it may be difficult to apply, and it may be difficult to apply a sufficient amount for adhesion. The coating amount is preferably 5 g / m 2 to 100 g / m 2 in terms of the solid content of the adhesive, and more preferably 10 g / m 2 to 80 g / m 2. When the application amount of the adhesive is less than 5 g / m 2, the adhesive strength is insufficient, and when the application amount is more than 100 g / m 2, the dry thickness of the adhesive layer becomes thick and affects the shot feeling. There is.

  The table tennis blade base material of the present invention is roughly classified into a plywood board and a single board, and the material can be classified into allwood and international table tennis rules. In the new material system, aramid fibers and carbon fibers are used by being laminated inside. However, since the rubber thickness can be accurately measured, the surface is preferably natural wood. In addition, in the general blade defined by the international table tennis rules, the surface is defined as natural wood.

  The rubber in the present invention is referred to as rubber together with a front member for hitting a table tennis ball and a member including a foam layer on the back surface. The rubber material is not particularly limited, and examples thereof include known materials such as natural rubber and isoprene rubber. If necessary, the rubber material is surface-treated with thermoplastic elastomer, modified nylon, curable polyurethane, or the like. A thing can be used combining a surface member and a foam layer of a back surface.

  Examples of the method for bonding the rubber and the blade include the following methods. A method of transferring a double-sided adhesive film produced by applying an adhesive onto a silicon-treated paper such as a release paper and drying it onto a bonding surface between a rubber and a blade substrate. A method in which an adhesive is directly applied to a bonding surface of a rubber with a racquet body and dried to be bonded. In any of the above cases, the adhesive surface may be coated with a release paper or the like, if necessary.

  The rubber including the foamed rubber body has a thickness of 1.5 mm to 4.0 mm. If it is less than 1.5 mm, the direction of the hit ball will not be stable, and if it is thicker than 4.0 mm, it will violate the competition rules. The thickness of the rubber is preferably 2.5 mm to 4.0 mm, more preferably 3.5 mm to 4.0 mm, because the hit ball is easily rotated and the direction of the hit ball is stable.

  After adhering the rubber to the blade, taping is preferably performed around the racket. Normally, taping is performed to prevent damage due to peeling of rubber during use or contact with a table tennis table, but the amount of adhesive used can be reduced. This also has the effect of reducing the adhesive residue at the time of rubber replacement.

FIG. 2 is a cross-sectional view of a preferred racket in which a rubber is bonded to a conductive layer on a table tennis blade base material. In FIG. 2, (h) a multilayer film in which (c) to (e) the conductive layer and the non-conductive layer shown in FIG. 1 are integrated on the blade base member is bonded with (f) a strong adhesive layer. And (i) the rubber surface member is formed by the soft adhesive layer (b),
It is glued.

  The details of a method for measuring the thickness of the table tennis racket from the rubber surface to the surface of the conductive layer fixed to at least part of the blade surface using an electromagnetic film thickness meter or an eddy current film thickness meter will be described.

  Measurement of rubber thickness using the conductive layer of the present invention requires at least measurement of the thickness of the sweet spot position. The position of the conductive layer is preferably present at a position (sweet spot) where the impact is least when the blade hits the ball. Further, in order to accurately measure the thickness, the area of the conductive layer with respect to the blade base material is preferably at least 10% or more, preferably 30% or more, more preferably 50% or more of the blade base material area.

  The shape of the conductive layer is preferably a circle or an ellipse with a sweet spot as the center, but the form in which the conductive layer exists on the entire blade surface (100% of the surface area) is most preferable.

  In the method of measuring the rubber thickness with high accuracy using the conductive layer of the present invention, it is necessary to further obtain an average value for accurate thickness measurement. Therefore, it is preferable to measure 4 to 9 points at the position of the hitting point including the sweet spot. FIG. 3 shows an example of preferable measurement points when measuring five points. As shown by the numbers 1 to 5 on the surface of the racket rubber in FIG. 3, the rubber film thickness is measured.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to Examples and Comparative Examples. Various measurement methods in the present invention are as follows.

(1) Rubber adhesive strength 1 g of commercial rubber adhesive was applied to both the table tennis blade base for evaluation and the sponge surface of the commercial rubber, and dried at room temperature for 30 minutes. The racket was made by pasting and left overnight. For an accelerated test, it was left for 2 weeks in a high temperature and high humidity (HH) environment at 40 ° C. and 80% RH. Using the racket, 100 forehandry hits were actually performed to confirm the presence or absence of rubber peeling.
A: No peeling after forehandry after acceleration test B: Forehandry after acceleration test, with some peeling at the periphery C: There is peeling after acceleration test

(2) Irregular in the direction of the hitting ball 1 g of commercial rubber adhesive is applied to each surface of the evaluation blade and the sponge surface of the commercial rubber, dried at room temperature for 30 minutes, and then the rubber is applied to the blade. I made a racket and left it overnight. Then, forehandry was performed using the racket, and the number of irregular hits due to a change in hit feeling was confirmed for every 100 straight balls returned to the center of the table tennis table.
A: No irregular batting for 100 times B: Irregular batting for 1-5 times for 100 times C: 6-10 times for irregular batting for 100 times

(3) Evaluation of adhesive residue The rubber of the racket used for evaluation of rubber adhesive strength in (1) was peeled off and the adhesive residue was visually observed.
A: Easy peeling, no adhesive residue, no damage to the blade base material B: Easy peeling, but adhesive residue with an adhesive area of 20% or less C: Easy to peel off; And damage is seen

(4) Evaluation of Volatile Organic Compound The odor of each adhesive was removed and the degree thereof was evaluated.
A: No odor or unpleasant odor B: Somewhat unpleasant odor C: Unpleasant odor or odor

(5) Measurement of rubber film thickness The rubber thickness after being applied to the blade is 1.0g of rubber adhesive applied to both the blade surface and the sponge surface of the rubber, and dried at room temperature for 30 minutes. After that, the rubber is pasted on the blade to form a rack and allowed to stand overnight. After that, the forehandry hit ball is actually used 100 times using the racket, and the rubber surface shown in FIG. 3 is removed without peeling off the rubber. The film thicknesses at five positions with different values were measured, and the average value (mm) of two decimal places was obtained. The measuring instrument is an electromagnetic film thickness meter (manufactured by ELNICS 8500 Kett Science Laboratory).

Formation of conductive film insulation film layer on blade Commercially available table tennis blade (7 Hanyang Fiber Special plywood made by Yasaka Co., Ltd.) To form a strong adhesive layer on the surface of 247 mm long, 150 mm wide, and 5.5 mm thick An adhesive (Super X Gold Cemedine Co., Ltd.) was applied.

  An aluminum laminate film that has an adhesive layer on both sides and is a seal in which a 7 μm thick conductive layer (aluminum conductivity 30000000 S / m) and a 9 μm thick insulating film layer (PET elastic modulus 2.5 GPa) are integrated. (Alpet 0709, manufactured by MPackaging Co., Ltd.) was cut out in the same shape as the blade base material, the release paper on the conductive layer side was peeled off, adhered to 100% of the surface area of the blade base material, and adhered and strongly bonded.

In addition, water-based rubber adhesive (Free Chuck II manufactured by Tamas Co., Ltd.) is uniformly applied to both sides of the insulating film layer and 3.50 mm thick rubber (Mark V-AD manufactured by Yasaka Co., Ltd.) using a sponge. Then, after drying at room temperature for 30 minutes, it was brought into close contact and softly bonded. The racket periphery was protected with a rubber peeling prevention tape (Yasaka Edge Tape Z-173, manufactured by Yasaka Corporation). 10 minutes after attaching the rubber to the blade, using an electromagnetic induction type film thickness measuring machine (manufactured by Kertz Scientific Laboratory, ELNICS 8500), the method described in (5) Measurement of rubber film thickness The thickness from the surface to the conductive layer was measured. The average thickness of the five points on the surface in FIG. 3 was 3.65 mm. Further, the rackets were also evaluated (1) to (4).

Instead of affixing an aluminum laminate film (ALPE0709, manufactured by MPackaging Co., Ltd.) on the entire surface of a commercially available table tennis blade (Hanyang Fiber Special 7 plywood, Yasaka Co., Ltd.) on the entire surface, the sweet spot of the blade is mainly used. A racket was prepared and evaluated in the same manner as in Example 1 except that a round aluminum laminate film (manufactured by MPE Packaging Co., Ltd., manufactured by ALPET0709) cut out to about 60% of the surface area of the blade was attached.

Instead of sticking ALPET0709 (aluminum laminate film, manufactured by MM Packaging Co., Ltd.) to the entire surface of a commercially available table tennis blade (7 Hanyang Fiber Special plywood, made by Yasaka Co., Ltd.), the sweet spot of the blade is mainly used. Except that the elliptical ALPET0709 (aluminum laminate film manufactured by MN Packaging Co., Ltd.) with a major axis / minor axis ratio of 1.3 cut out to about 45% of the surface area of the blade was pasted so that the major axis in the horizontal direction was the major axis. A racket was prepared in the same manner as in Example 1 and evaluated.

Instead of affixing ALPET0709 (aluminum laminate film, manufactured by M.A. Packaging Co., Ltd.) to the entire surface of a commercially available table tennis blade (7 Hanyang Fiber Special plywood, manufactured by Yasaka Co., Ltd.), it has an adhesive layer on both sides. AL-35FR (conductive tape manufactured by Sumitomo 3M Co., Ltd.) is a seal in which a 10 μm thick conductive layer (aluminum) and a 25 μm thick high modulus insulating film layer (PET elastic modulus 4 GPa) are integrated. A racket was prepared and evaluated in the same manner as in Example 1 except that was attached.

Instead of affixing ALPET0709 (aluminum laminate film, manufactured by MM Packaging Co., Ltd.) to the entire surface of a commercially available table tennis blade (hanyang fiber special 7 plywood, manufactured by Yasaka Co., Ltd.), it has an adhesive layer on both sides. AL-37BLK (conductive tape manufactured by Sumitomo 3M Co., Ltd.) is a seal in which a 25 μm thick conductive layer (aluminum) and a 12 μm thick high elastic insulating film layer (PET elastic modulus 4 GPa) are integrated. A racket was prepared and evaluated in the same manner as in Example 1 except that was attached.

Instead of the rubber adhesive (free chuck II manufactured by Tamas Co., Ltd.) used in Example 1, a water-based adhesive (for Turbo-Fix table tennis rubber manufactured by Andro Japan Co., Ltd.) was used as in Example 1. A racket was created and evaluated.

Instead of the water-based rubber adhesive (free chuck II manufactured by Tamas Co., Ltd.) used in Example 1, a solvent-based adhesive (eco-effect manufactured by Juwick Co., Ltd.) was used. Created and evaluated.

Instead of affixing an aluminum laminate film (ALPE0709, manufactured by MPackaging Co., Ltd.) to the entire surface of a commercially available table tennis blade (Hanyang Fiber Special, 7 plywood, Yasaka Co., Ltd.), copper foil (18 μm thick, conductive) A racket was prepared and evaluated in the same manner as in Example 1 except that a rate of 60000000 S / m manufactured by Furukawa Electric was attached.

Instead of affixing ALPET0709 (aluminum laminate film, manufactured by MPackaging Co., Ltd.) to the entire surface of a commercially available table tennis blade (Hanyang Fiber Special 7 plywood, manufactured by Yasaka Co., Ltd.), conductivity 12000 (S / m ) (Dotite D-550, manufactured by Fujikura Kasei Co., Ltd.) with a room-temperature dry silver paste, which was 5 to 10 μm after drying, and further an aqueous adhesive (free chuck II manufactured by Tamas Co., Ltd.) was applied. Except for the above, a racket was prepared and evaluated in the same manner as in Example 1.

A racket was prepared in the same manner as in Example 1 except that a solvent-based adhesive (Super Long Chuck, manufactured by Tamas Co., Ltd.) was used instead of the aqueous adhesive (Free Chuck II, manufactured by Tamas Co., Ltd.) used in Example 1. And evaluated.

[Comparative Example 1] Instead of sticking an aluminum laminate film (ALPE0709, manufactured by EM Packaging Co., Ltd.) to the surface of a commercially available table tennis blade (7 Hanyang Fiber Special plywood, manufactured by Yasaka Co., Ltd.), an ordinary PET film A racket was prepared and evaluated in the same manner as in Example 1 except that (thickness 10 μm) was used.

[Comparative Example 2] Instead of sticking an aluminum laminate film (ALPE 0709, manufactured by MPackaging Co., Ltd.) to the housing of the surface of a commercially available table tennis blade (7 Hanyang fiber special plywood, manufactured by Yasaka Co., Ltd.) A rubber was adhered to create a racket and evaluated in the same manner as in Example 1 except that an 80 μm aluminum tape (No. 8167 manufactured by Slion Tech) was attached.

[Comparative Example 3] Without attaching an aluminum laminate film (ALPE 0709, manufactured by MMA Packaging Co., Ltd.) directly to the housing of the surface of a commercially available table tennis blade (7 Hanyang Fiber Special plywood, manufactured by Yasaka Co., Ltd.) A racket was prepared and evaluated in the same manner as in Example 1 except that rubber was attached.

The results of each evaluation of Examples 1 to 10 and Comparative Examples 1 to 3 are summarized in Table 1.

[Reference Example 1] In Example 1, instead of measuring the thickness from the surface of the rubber to the conductive layer 10 minutes after attaching the rubber to the blade. After affixing the rubber, it was dried at room temperature for a week, and the thickness from the rubber surface to the conductive layer was measured. The average thickness of the five points on the surface in FIG. 3 was 3.65 mm.

[Reference Example 2] An eddy current film thickness measuring device (SWT-8000II, manufactured by Sanko Electronics Laboratory) instead of the electromagnetic induction film thickness measuring device (ELNICS 8500, manufactured by Ketto Scientific Laboratory) used in Example 1. The measurement was tried using. Similarly, accurate rubber thickness measurement was possible.

[Reference Example 3] An ultrasonic film thickness meter (ULT-5000 Sanko Electronics Laboratory) was used in place of the electromagnetic induction film thickness measuring device (ELNICS 8500, manufactured by Kett Scientific Laboratory) used in Example 1. ), An attempt was made using a digital thickness gauge (manufactured by Toyo Seiki Co., Ltd.), but accurate rubber thickness measurement was not possible.

Seal section with integrated conductive film and insulating film layer coated with adhesive on both sides The table tennis racket cross section which shows 1st embodiment of this invention. The example of the measurement point in the measuring method which shows 2nd embodiment of this invention.

(A) Release paper (b) Light adhesive layer (c) Insulating film layer (d) Adhesive layer between conductive layer and insulating film layer (e) Conductive layer (f) Strong adhesive layer (g) Release paper (h) Blade base material (i) Rubber

Claims (6)

  A table tennis racket blade comprising at least a blade base material and a conductive layer, and constituting a table tennis racket by adhering rubber, and having a conductive layer on at least a part of the surface of the table tennis racket blade, the conductive layer Table tennis blades having an electrical conductivity of 10000 (S / m) or more and an average thickness of 1 to 50 μm.   The table tennis blade according to claim 1, further comprising an insulating film layer having a thickness of 0.5 to 25 µm and an elastic modulus of 0.5 to 10 GPa on the conductive layer of the table tennis blade.   A rubber layer was adhered to a table tennis blade having a conductive layer on at least a part of the surface of the table tennis racket blade, the conductivity of the conductive layer being 10,000 (S / m) or more, and an average thickness of 1 to 50 μm. A table tennis racket, which is a table tennis racket having a thickness from the rubber surface to the conductive layer of 1.5 to 4.0 mm.   The table tennis racket according to claim 3, further comprising an insulating film layer having a thickness of 0.5 to 25 µm and an elastic modulus of 0.5 to 10 GPa on the table tennis blade having the conductive layer.   5. The table tennis racket according to claim 3, wherein the racket peripheral portion is protected with a rubber peeling preventing tape.   6. The table tennis racket according to claim 3, wherein the thickness from the surface of the rubber to the surface of the conductive layer formed on the blade substrate is measured by an electromagnetic film thickness meter or an eddy current film thickness meter.

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