JP6221503B2 - Percussion instrument pad and method of manufacturing percussion instrument pad - Google Patents

Description

  The present invention relates to a percussion instrument pad and a method for manufacturing a percussion instrument pad.

  As a percussion instrument pad, a drum pad used for an electronic percussion instrument that detects an impact on a hitting surface with a sensor and generates an electronic sound similar to that of a natural percussion instrument is known. As such a drum pad, a laminate in which a fiber sheet having elasticity is laminated on the surface of an elastomeric pad main body is known for the purpose of reducing a preferable hit feeling and hitting sound (for example, JP 2010-262167 A). See the official gazette).

  In such a drum pad, a fiber sheet is disposed on a mold, an elastomer composition (pad body forming material) is supplied to the mold, and the elastomer composition is cured to thereby provide a fiber sheet on the surface. Has obtained a bonded pad body.

  However, since the elastomer composition that is the pad body forming material is cured in a state where the fiber sheet is impregnated in the surface layer portion of the pad body, the elastomer existing in the fiber sheet inhibits the stretchability of the fiber sheet, and the drum pad The surface layer may become hard. Further, the fiber sheet disposed in the molding die is crushed in the thickness direction by the molding pressure when the pad body is molded, and becomes thin, which may cause the surface layer of the drum pad to become hard. When the surface layer of the drum pad becomes hard as described above, a favorable feel is not obtained and the hitting sound is increased.

JP 2010-262167 A

  The present invention has been made on the basis of such circumstances, and an object of the present invention is to provide a percussion instrument pad having a favorable percussion sound and a low percussion sound, and a method for manufacturing the percussion instrument pad.

The percussion instrument pad according to the present invention, which has been made to solve the above problems,
An elastomeric pad body, and an extensible fiber sheet laminated on the surface side of the pad body,
A composite layer in which the elastomer of the pad body and the fibers of the fiber sheet are present,
A resin coating layer laminated on the surface side of the fiber sheet; and an intermediate layer that is disposed between the resin coating layer and the composite layer and is formed of the fibers without the elastomer.

  Since the percussion instrument pad has a composite layer in which the elastomer of the pad main body and the fibers of the fiber sheet are present, the pad main body and the fiber sheet can be firmly joined by the composite layer. In addition, since the intermediate layer located between the composite layer and the resin coating layer is composed of fibers of the fiber sheet without the presence of an elastomer, there are voids between the fibers in the intermediate layer, Due to the presence of the voids, the intermediate layer can be easily and reliably stretched, and the surface layer of the percussion instrument pad has a preferable softness, so that a favorable hit feeling can be obtained and the hitting sound is small. Furthermore, since the resin coating layer is laminated on the surface of the fiber sheet, the deterioration of the fiber sheet can be suppressed.

  As the elastomer, polyurethane foam is preferable, and this makes it easy to adjust the degree of impregnation of the elastomer into the fiber sheet, so that a better percussion feel and a smaller percussion sound of the percussion instrument pad can be obtained.

  The average thickness of the intermediate layer with respect to the average thickness of the fiber sheet is preferably 10% or more and 70% or less. As a result, the above-described good hitting feeling and small hitting sound are obtained, and the bonding between the fiber sheet and the pad main body and the bonding between the fiber sheet and the resin coating layer are strengthened.

  As described above, when foamed polyurethane is used as the elastomer, the fiber sheet may be subjected to water repellent treatment. Thus, when the percussion instrument pad is manufactured, when the elastomer composition for forming the pad main body is supplied to the back side of the fiber sheet, the elastomer sheet is not easily impregnated into the fiber sheet, and it is easy and reliable. An intermediate layer can be formed.

The percussion instrument pad manufacturing method includes a step of forming a resin coating layer on the surface of an extensible fiber sheet, a step of supplying an elastomer composition to the back side of the fiber sheet, and the elastomer composition completely on the fiber sheet. A step of curing the elastomer composition before impregnation.

  According to the method of manufacturing the percussion instrument pad, the composite layer of the fiber and the fiber of the fiber sheet, the resin coating layer laminated on the surface side of the fiber sheet, and the resin coating layer and the composite layer are disposed. The percussion instrument pad having an intermediate layer composed of fibers can be manufactured easily and reliably, and the percussion instrument pad manufactured in this way provides a favorable percussion feeling and has a low percussive sound.

  As described above, the percussion instrument pad according to the present invention provides a favorable feel and a low percussive sound.

1 is a schematic cross-sectional view for explaining an overall configuration of a drum pad according to an embodiment of the present invention. It is explanatory drawing for demonstrating the layer structure of the drum pad of FIG. It is a schematic sectional drawing explaining the process of the manufacturing method of the drum pad of FIG. 2 is an enlarged cross-sectional photograph of the main part of the drum pad of Example 1. FIG. 4 is an enlarged cross-sectional photograph of a main part of a drum pad of Comparative Example 1.

  Hereinafter, embodiments of the present invention will be described. First, as a percussion instrument pad according to the present invention, a drum pad 1 used in an electronic drum and hit with a stick or the like will be described as an example with reference to the drawings. The percussion instrument pad according to the present invention is not limited to the drum pad 1 but can be applied to other percussion input devices.

[Drum pad]
The drum pad 1 shown in FIG. 1 senses an impact when a pad body 2 made of an elastomer, an extensible fiber sheet 3 laminated on the front surface side of the pad body 2, a support 4 that supports the pad body 2 from the back surface side, and a hit. A sensor 5 is provided. The drum pad 1 is assumed to be used for, for example, a 10-14 inch snare or tom of an electronic drum. Specifically, the drum pad 1 has a diameter of 200 to 300 mm and a thickness of about 10 to 30 mm. The drum pad 1 may be provided with a substantially cylindrical shell (drum body (not shown)) surrounding the pad body 2, and the shell may have a rim at the surface side end. . The size and usage of the drum pad 1 are not limited to those described above.

  Further, the drum pad 1 has a multilayer structure of an elastomer layer 11, a composite layer 12, an intermediate layer 13 and a resin coating layer 14 on the surface side of the support 4 as shown in FIG. The elastomer layer 11 constitutes the pad body 2 and is a layer made of only an elastomer. The composite layer 12 is disposed on the surface of the elastomer layer 11 and is a layer in which the elastomer of the pad main body 2 and the fibers of the fiber sheet 3 are present. The resin coating layer 14 is a resin layer laminated on the surface side of the fiber sheet 3. The intermediate layer 13 is a layer that is disposed between the resin coating layer 14 and the composite layer 12 and is composed of only the fibers without the elastomer.

(Fiber sheet)
The fiber sheet 3 is not particularly limited as long as it is provided in a stretchable sheet shape, and a known fiber sheet 3 is used. The fiber sheet 3 is preferably stretchable, that is, the fiber sheet 3 itself has a restoring force when stretched. Here, it is preferable that the fiber sheet 3 can be expanded and contracted in any direction (two-dimensional arbitrary direction) in the sheet plane direction (two-way stretch). Specifically, a knit material (knit knitted fabric) is used. It is preferable to adopt.

  The fibers constituting the fiber sheet 3 are not particularly limited as long as the elastomer composition can be impregnated into a part of the fiber sheet 3 as described later, and natural fibers can be adopted. Synthetic fibers are preferably used from the viewpoint of the strength of the sheet 3 and the like. Examples of the synthetic fibers include fibers made of polyolefin resins such as polyethylene resins and polypropylene resins, fibers made of polyamide resins such as polyester resins, polyacrylic resins and nylon, and copolymers, modified products and combinations of these resins. The synthetic fiber which becomes is mentioned. These fibers can be used alone, or a plurality of types of fibers can be used in combination.

  Furthermore, when a knit material is used as the fiber sheet 3 as described above, the lower limit of the fineness of the fiber is preferably 140 dtex, and more preferably 150 dtex. On the other hand, the upper limit of the fineness of the fiber is preferably 200 dtex, and more preferably 190 dtex. There exists a possibility that the intensity | strength of the fiber sheet 3 may become inadequate that the said fineness is less than the said minimum. On the other hand, if the fineness exceeds the upper limit, the fiber sheet 3 becomes too thick, and there is a risk that the feel of hitting may be impaired.

  Moreover, as a minimum of the gauge of the said knit material, 50G is preferable and 55G is more preferable. On the other hand, the upper limit of the gauge is preferably 70G, and more preferably 65G. If the gauge is less than the lower limit, the strength of the fiber sheet 3 may be insufficient. On the contrary, if the gauge exceeds the upper limit, the fiber sheet 3 itself is expensive, which may increase the cost of the drum pad 1.

  Furthermore, since the gauge of the knit material is within the above range, and the fineness of the fiber is within the above range, the fiber sheet 3 is between fibers so that the elastomer composition is preferably impregnated as described later. Thus, the composite layer 12 and the intermediate layer 13 can be formed easily and reliably.

  Moreover, as a minimum of the average thickness of the said fiber sheet 3, 250 micrometers is preferable and 400 micrometers is more preferable. On the other hand, the upper limit of the average thickness of the fiber sheet 3 is preferably 800 μm, and more preferably 600 μm. If the average thickness of the fiber sheet 3 is less than the lower limit, the formation of the intermediate layer 13 may be difficult. On the contrary, when the average thickness of the fiber sheet 3 exceeds the upper limit, the fiber sheet 3 becomes too thick, and the feel of hitting may be impaired.

  The fiber sheet 3 is preferably subjected to water repellent treatment when the elastomer is a polyurethane resin. Thereby, as will be described later, the fiber sheet 3 can be appropriately impregnated with the elastomer composition. This water repellent treatment can be applied after the fibers are knitted into a sheet shape, or can be applied to the fibers themselves before knitting. Further, as the water repellent treatment, a known treatment can be appropriately employed. For example, a method of applying or impregnating the fiber sheet 3 with a water repellent such as a silicone water repellent or a fluorine water repellent can be employed. .

(Pad body)
The elastomer of the pad body 2 is foamed polyurethane in the present embodiment. As the foamed polyurethane composition, a known material is used. Specifically, for example, a composition containing a polyol, an isocyanate and a foaming agent is used. The foamed polyurethane composition is a curing agent, a colorant, a light stabilizer, a heat stabilizer, an antioxidant, an antifungal agent, a flame retardant, etc. These various additives may be contained. In particular, for the purpose of adjusting the viscosity, the foamed polyurethane composition may contain a thickener or a filler.

  The polyol is not particularly limited as long as it can form a urethane bond with isocyanate, and examples thereof include polyether polyol, polyester polyol, polycarbonate polyol, and polycaprolactone polyol.

  The number average molecular weight of the polyol is preferably 200 or more and 10,000 or less. If the number average molecular weight is less than the lower limit, the reaction proceeds rapidly, so that desired molding may be difficult, and the flexibility of the pad body 2 may be insufficient. On the other hand, if the number average molecular weight exceeds the upper limit, the foamed polyurethane composition may have too high a viscosity and may be difficult to mold.

  The isocyanate is not particularly limited as long as it can form a urethane bond with a polyol, and examples thereof include tolylene diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate.

  The foaming agent is not particularly limited as long as it can be foamed when the pad main body 2 is molded, and examples thereof include a pyrolytic foaming agent that foams by heat. As the thermal decomposition type foaming agent, for example, a bidazide type such as oxybenzenesulfonyl hydrazide (OBSH) or paratoluenesulfonyl hydrazide, an azo type such as azodicarbonamide (ADCA) or azobisformamide can be used. The decomposition temperature of the thermally decomposable foaming agent is preferably 100 ° C. or higher and 240 ° C. or lower in consideration of ease of molding of the pad body 2.

(Support)
In the present embodiment, the support 4 is composed of a flat disk. The material of this support body 4 is not specifically limited, For example, metal plates, such as an iron plate, a steel plate, a galvanized steel plate, an aluminum plate, etc. are used. Further, the thickness of the support 4 is not particularly limited, and the average thickness of the support 4 can be, for example, 0.5 mm or more and 3 mm or less.

  The pad body 2 is directly laminated on the surface of the support 4. That is, in this embodiment, the support body 4 and the pad main body 2 are joined by the foaming pressure of the polyurethane foam constituting the pad main body 2. Specifically, the bonded state between the pad main body 2 and the support 4 is obtained by foaming and curing the foamed polyurethane composition (pad main body forming material) on the surface of the support 4.

  The lower limit of the peel adhesion strength between the pad body 2 and the support 4 is preferably 5 N / 25 mm, and more preferably 7 N / 25 mm. If the peel adhesion strength is less than the lower limit, the bonding state between the pad main body 2 and the support 4 is insufficient, and the pad main body 2 and the support 4 may be inadvertently peeled off. The peel adhesion strength is a value measured according to JIS K6854-1.

(sensor)
As shown in FIG. 1, the sensor 5 is attached to the back side of the support 4. The sensor 5 is bonded to the back surface of the support 4 via an adhesive (not shown). It is also possible to change the design as appropriate by interposing a vibration absorbing material between the sensor 5 and the back surface of the support 4. Further, the position of the sensor 5 is not particularly limited, but the sensor 5 is preferably attached to the center of the planar support 4. The adhesive is not particularly limited as long as it can adhere the sensor 5, and for example, a reactive adhesive can be used as the adhesive.

  The sensor 5 senses a hit on the pad main body 2 having the fiber sheet 3 disposed on the surface, and outputs a hit detection signal from a signal output line (not shown) to an electronic sound source (not shown). The sensor 5 is not particularly limited as long as it can detect a hit as described above, and for example, a piezoelectric element, a sound collecting microphone, or the like is used.

(Explanation of layer structure)
The resin coating layer 14 is not particularly limited as long as it is a layer that covers the surface side of the fiber sheet 3. For example, the resin coating layer 14 is formed by heat-sealing a stretchable film that can be heat-sealed to the fiber sheet 3 surface. be able to. Examples of the resin of the resin coating layer 14 include polyolefin resins such as polyethylene resins and polypropylene resins, polyurethane resins, polyester resins, and copolymers of these resins. In addition, the thickness of the said resin coating layer 14 is not specifically limited, As average thickness of this resin coating layer 14, it can be 10 micrometers or more and 80 micrometers or less, for example. In addition, this resin coating layer 14 can also be comprised from the composite layer in which the resin which is coating material, and the fiber of the fiber sheet 3 exist, and the resin layer of coating material and the said composite layer of this back surface side It is also possible to constitute from the two-layer structure.

  The lower limit of the surface hardness (Asker hardness C) of the resin coating layer 14 is preferably 10, and more preferably 30. On the other hand, the upper limit of the hardness is preferably 60 and more preferably 50. If the hardness is less than the lower limit, the surface layer of the drum pad 1 becomes too soft, and a favorable feel may not be obtained. On the contrary, if the hardness exceeds the upper limit, the surface layer of the drum pad 1 becomes too hard, and there is a possibility that a favorable hit feeling may not be obtained. The hardness is a value measured by JIS K 7312 Asker C hardness.

  The intermediate layer 13 is a layer composed of only the fibers of the fiber sheet 3 without the elastomer of the pad main body 2 as described above, and has a gap between the fibers. The lower limit of the average thickness of the intermediate layer 13 with respect to the average thickness of the fiber sheet 3 is preferably 10%, and more preferably 20%. On the other hand, the upper limit of the average thickness of the intermediate layer 13 with respect to the average thickness of the fiber sheet 3 is preferably 90%, and more preferably 80%. If the average thickness of the intermediate layer 13 with respect to the average thickness of the fiber sheet 3 is less than the lower limit, the intermediate layer 13 becomes too thin, and the effect of improving the hit feeling and impact sound by the intermediate layer 13 may be insufficient. . Conversely, when the average thickness of the intermediate layer 13 with respect to the average thickness of the fiber sheet 3 exceeds the upper limit, the bonding between the fiber sheet 3 and the pad body 2 or the bonding between the fiber sheet 3 and the resin coating layer 14 is insufficient. There is a risk.

  The composite layer 12 is a layer in which the elastomer of the pad main body 2 and the fibers of the fiber sheet 3 exist as described above, and the pad main body 2 and the fiber sheet 3 are firmly bonded by the composite layer 12. As will be described later, the composite layer 12 is formed by impregnating a part (back surface) of the fiber sheet 3 and curing the elastomer composition. The lower limit of the average thickness of the composite layer 12 with respect to the average thickness of the fiber sheet 3 is preferably 10%, and more preferably 20%. On the other hand, as an upper limit of the average thickness of the composite layer 12 with respect to the average thickness of the fiber sheet 3, 90% is preferable and 80% is more preferable. When the average thickness of the composite layer 12 with respect to the average thickness of the fiber sheet 3 is less than the lower limit, the fiber sheet 3 and the pad main body 2 may be insufficiently joined. Conversely, if the average thickness of the composite layer 12 with respect to the average thickness of the fiber sheet 3 exceeds the upper limit, the intermediate layer 13 becomes too thin, and the effect of improving the hit feeling and the hitting sound by the intermediate layer 13 may be insufficient. There is.

  The elastomer layer 11 is a layer constituting the pad main body 2 as described above, and the back surface of the elastomer layer 11 is bonded to the surface of the support 4 by foaming pressure. The thickness of the elastomer layer 11 is not particularly limited, and the average thickness of the elastomer layer 11 may be, for example, 5 mm or more and 20 mm or less.

  The lower limit of the expansion ratio of the elastomer layer 11 and the composite layer 12 is preferably 1.2 times, and more preferably 1.5 times. The expansion ratio means a value obtained by dividing the volume after foaming assumed when the elastomer composition is foamed under atmospheric pressure by the total volume of the actually formed elastomer layer and composite layer. On the other hand, the upper limit of the expansion ratio is preferably 5.5 times, and more preferably 2.5 times. If the expansion ratio is less than the lower limit, the bonding strength between the elastomer layer 11 and the support 4 may be weakened because the expansion pressure is too small. On the contrary, if the expansion ratio exceeds the upper limit, the pressure in the mold becomes too large, the mold cannot withstand the pressure, and the elastomer layer 11 and the composite layer 12 cannot be molded. In addition, high cost is required to manufacture a mold that can withstand the pressure.

  Moreover, as a minimum of the porosity of the said elastomer layer 11, 30% is preferable and 40% is more preferable. On the other hand, the upper limit of the porosity is preferably 80%, and more preferably 70%. If the porosity is less than the lower limit, the elastomer layer 11 may become too hard, so that a preferable feel of the drum pad 1 may not be obtained. On the other hand, when the porosity exceeds the upper limit, the elastomer layer 11 becomes too soft and the strength against impact becomes insufficient. The “porosity” can be measured by (resin specific gravity−apparent density) × 100. The apparent density can be calculated by JIS K 7222 foamed plastic and rubber-how to determine the apparent density.

[Manufacturing method of the drum pad]
Next, a method for manufacturing the drum pad 1 will be described.

The manufacturing method of the drum pad 1 is as follows:
Forming a resin coating layer 14 on the surface of the extensible fiber sheet 3;
Supplying an elastomer composition to the back side of the fiber sheet 3;
A step of curing before the elastomer composition is completely impregnated into the fiber sheet 3, and a step of attaching the sensor 5 to the back surface of the support 4.

  In the resin coating layer forming step, the resin coating layer 14 can be formed by, for example, heat-sealing a stretchable film that can be heat-sealed to the surface of the fiber sheet 3. In addition, as a resin coating layer formation process, it is also possible to employ | adopt the method of coating the resin coating layer formation material on the surface of the fiber sheet 3, and making it dry.

  In the elastomer composition supplying step, first, a liquid elastomer composition is supplied in a state where the fiber sheet 3 is disposed in a molding die 6 for forming a pad main body as shown in FIG. In the illustrated example, the fiber sheet 3 is disposed so as to be positioned on the bottom surface, and the support body 4 is illustrated as constituting the lid of the mold 6, but the support body 4 serves as the bottom of the mold 6 and the fiber sheet 3. It is also possible to change the design as appropriate so as to be disposed on the top surface.

  Between this elastomer composition supplying step and the elastomer composition curing step, the elastomer composition does not completely impregnate the fiber sheet 3 but impregnates only a part (back surface) of the fiber sheet 3.

  In the elastomer composition curing step, the elastomer composition supplied to the mold 6 is cured as described above. Thereby, the pad main body 2 is molded, and the composite layer 12 and the intermediate layer 13 as described above are formed.

  In this elastomer composition curing step, the elastomer composition foams and cures, and the support 4 and the pad main body 2 are joined by the foaming pressure. Specifically, the elastomer composition is foamed, for example, by heating or the like, and is cured by polymerization of polyol and isocyanate, whereby the pad main body 2 is molded and bonded to the support 4.

The foaming pressure (pressure in the mold 6 in the elastomer composition curing step) is preferably 1.2 kgf / cm ² or more and 5.5 kgf / cm ² or less. If the foaming pressure is less than the lower limit, sufficient bonding between the pad main body 2 and the support 4 may not be obtained. On the contrary, if the foaming pressure exceeds the upper limit, a cost is required to form the mold 6 that can withstand this pressure, which may increase the manufacturing cost.

  The sensor attaching step can be performed after the elastomer composition curing step or before the elastomer composition supplying step.

[advantage]
In the drum pad 1, the intermediate layer 13 is composed only of the fibers of the fiber sheet 3, and the intermediate layer 13 has voids between the fibers. The percussion instrument pad 1 can be reliably stretched, and the surface layer of the percussion instrument pad 1 has a preferable softness. Thus, the percussion instrument pad can have a preferable percussion feeling and has a low percussive sound.

  Further, in the drum pad 1, even when the fiber sheet 3 disposed in the molding die 6 is crushed in the thickness direction by the molding pressure when the pad main body 2 is molded, the drum pad 1 as described above. Since the pad has an intermediate layer in which no elastomer is present, the fiber sheet 3 can be restored from the collapsed state after molding, and the surface layer can have a preferable softness as described above.

  Further, since the pad main body 2 is directly laminated on the surface of the support 4, that is, the pad main body 2 and the support 4 can be bonded using the foaming pressure of the elastomer composition, the pad main body 2 is bonded between the pad main body 2 and the support 4. There is no need to provide an agent layer, and therefore manufacturing costs can be reduced. Further, since the percussion instrument pad does not have an adhesive layer between the pad main body 2 and the support 4 as described above, the sensor due to the presence of the adhesive layer between the pad main body 2 and the support 4. There is no delay in the detection timing of 5, and the sensitivity of the sensor 5 is good.

[Other Embodiments]
The present embodiment has the above-described configuration and has the above-described advantages. However, the present invention is not limited to the above-described embodiment, and the design can be changed as appropriate within the intended scope of the present invention.

  That is, in the above-described embodiment, the pad main body is made of foamed polyurethane, but the pad main body can be made of, for example, silicone rubber. As this silicone rubber, a silicone rubber having a siloxane bond, such as a foamable silicone RTV rubber, can be used.

  Further, in the present invention, the support is not an essential component, and even when the percussion instrument pad includes a support, the pad body and the support are joined by the foaming pressure of the foamed elastomer. It is not limited. That is, it is also possible to interpose an adhesive layer between the pad main body and the support, and to bond the pad main body and the support by this adhesive layer. In addition, as an adhesive which comprises the said adhesive bond layer, an acrylic adhesive etc. can be used, for example.

  Further, in the percussion instrument pad, a cloth-like material made of a nonwoven fabric or the like can be disposed on the back surface of the elastomer layer. In the case where the cloth-like material is disposed on the back surface of the elastomer layer as described above, it is preferable to interpose an adhesive layer between the cloth-like material and the support. In addition, as an adhesive which comprises the said adhesive bond layer, an acrylic adhesive etc. can be used, for example.

  Further, the percussion instrument pad is not limited to the one provided with the intermediate layer made of only fibers in the entire region in the plane direction. That is, in the percussion instrument pad, in the plane direction, an intermediate layer existence region where the resin coating layer and the composite layer are arranged with a gap (intermediate layer), and an intermediate layer where the resin coating layer and the composite layer are in contact with each other are absent. It is also possible to provide a region. Specifically, for example, the back surface of the fiber sheet is partially subjected to water repellency treatment in plan view, and the foamed polyurethane composition is supplied to the back surface of the fiber sheet and cured, thereby corresponding to the water-repellent portion. The region may be the intermediate layer existence region, and the region corresponding to the other part may be the intermediate layer absence region.

  Furthermore, it is possible to further include a region where the composite layer does not exist in the planar direction. That is, in the percussion instrument pad, a region having a composite layer of an elastomer and a fiber on the back side of the intermediate layer, and an elastomer layer (a layer made only of an elastomer) and an intermediate layer (fiber) without being impregnated with the elastomer composition It is also possible to provide a region in which no composite layer exists between the layer and the other layer. In addition, when forming a composite layer absence area | region as mentioned above, before supplying an elastomer composition, the method of partially sealing on the back surface of a fiber sheet is employable.

  Furthermore, in the above-described embodiment, the fiber sheet subjected to the water repellent treatment in order to adjust the degree of impregnation of the elastomer composition has been described. For example, by supplying gas to the fiber sheet during molding, It is also possible to adjust the degree of impregnation of the elastomer composition. Moreover, it is also possible to provide the fiber sheet with a sublimable additive and sublimate the additive after molding so that a gas is suitably interposed in the intermediate layer.

[Example 1]
First, a fiber sheet having a resin coating layer with an average thickness of 20 μm on the surface was prepared by laminating a polyurethane film on a fiber knitted with 60 G of polyester resin having a fineness of 160 dtex. In addition, the average thickness of a fiber sheet is 500 micrometers. In addition, a water repellent treatment was applied to the fiber sheet by applying a release agent on the back side. The water-repellent treatment was performed using a fluorine-based mold release agent, specifically, Daifree FB-962 manufactured by Daikin Industries, Ltd. as the mold release agent.

  A liquid elastomer composition is supplied in a state where the fiber sheet is disposed on the bottom surface of the mold, and the support is disposed so as to form a lid of the mold, thereby closing the mold. As this elastomer composition, one containing 25 parts by mass of an isocyanate component, 0.5 parts by mass of a foaming agent, 0.5 parts by mass of a catalyst, and 1 part by mass of a foam stabilizer is used with respect to 100 parts by mass of a polyol component. As the polyol component, PTMG2000 manufactured by Mitsubishi Chemical Corporation was used. As the isocyanate component, carbodiimide-modified MDI manufactured by BASF INOAC Polyurethane Co., Ltd. was used. Water was used as the foaming agent, triethylenediamine was used as the catalyst, and a silicon-based foam stabilizer was used as the foam stabilizer. A 0.8 mm thick galvanized steel sheet was used as the support. The mold is provided so that the average thickness of the pad body to be molded is 15 mm.

In the mold closed as described above, the pad body forming material was foamed and cured at a temperature of 55 ° C. for 30 minutes. Here, the elastomer composition is charged in an amount that causes free foaming about 1.5 to 2 times the volume of the mold. Specifically, 250 cc of the elastomer composition was put into a mold having a volume of 615 cc. When the elastomer composition is free-foamed, the volume expands to 4 times, that is, 1000 cc, but expands and cures in the mold as described above, and therefore does not expand beyond 615 cc. For this reason, the expansion ratio of the pad body can be calculated by 1000 cc / 615 cc, which is 1.62 times. The expansion ratio can be adjusted by adjusting the amount of water as the foaming agent. For example, the expansion ratio can be increased to 6 times by adjusting the amount of water. Moreover, although a foaming polyurethane composition does not expand exceeding 615cc as mentioned above, the part which was not able to expand contributes as a foaming pressure. Here, the foaming pressure is 1.2 to 5.5 kgf / cm ² . Moreover, the porosity of this pad main body was 0.45, and the Asker hardness C of the pad main body was 40.

  As described above, the pad main body is formed by foaming and curing the elastomer composition, whereby an intermediate layer constituted by the fibers without the elastomer between the resin coating layer and the composite layer. Formed. The average thickness of this intermediate layer was 200 μm.

[Comparative Example 1]
A drum pad of Comparative Example 1 was obtained in the same manner as in Example 1 except that a fiber sheet not subjected to water repellent treatment was used. In the drum pad of Comparative Example 1, since the elastomer composition is cured in a state where the fiber sheet is completely impregnated with the liquid elastomer composition, there is no intermediate layer as in Example 1, and the resin coating A composite layer (a layer made of fibers and an elastomer) is directly laminated on the back surface of the layer.

<Beat feeling test>
When compared with the drum pad of Comparative Example 1, the drum pad of Example 1 gave a favorable feel. Specifically, the drum pad of Example 1 provided a moist feel, whereas the drum pad of Comparative Example 1 did not provide a moist feel. Further, the drum pad of Example 1 had a lower impact sound than the drum pad of Comparative Example 1.

  As described above, the percussion instrument pad according to the present invention can be suitably used for an electronic musical instrument such as an electronic drum, for example, because it provides a favorable feel and a low percussive sound.

DESCRIPTION OF SYMBOLS 1 Drum pad 2 Pad body 3 Fiber sheet 4 Support body 5 Sensor 6 Mold 11 Foam elastomer layer 12 Composite layer 13 Intermediate layer 14 Resin coating layer

Claims (4)

An elastomeric pad body, and an extensible fiber sheet laminated on the surface side of the pad body,
A composite layer in which the elastomer of the pad body and the fibers of the fiber sheet are present,
A percussion instrument pad comprising: a resin coating layer laminated on a surface side of the fiber sheet; and an intermediate layer that is disposed between the resin coating layer and the composite layer and is formed of the fibers without the elastomer.   The percussion instrument pad according to claim 1, wherein the elastomer is foamed polyurethane.   The percussion instrument pad according to claim 1 or 2, wherein an average thickness of the intermediate layer with respect to an average thickness of the fiber sheet is 10% or more and 90% or less.   The percussion instrument pad according to claim 2, wherein the fiber sheet is subjected to a water repellent treatment.