A non-full-adhesion table tennis bat bottom plate

Abstract

The utility model discloses a kind of non-adhesion's table tennis bat bottom plate, belong to table tennis bat field, including multilayer single board, adjacent the single board between there is for the gluing layer of adhesion adjacent single board, the gluing layer includes gluing area and the non-gluing area surrounded by the gluing area.The utility model has a non-continuous gluing layer between each single board, i.e. Adopt non-adhesion between each single board, the prepared bottom plate is good in elasticity, light in weight, small in ball hitting noise, small in ball receiving vibration.

Description

Technical Field

[0001] This utility model relates to the field of table tennis rackets, and more particularly to a non-fully bonded table tennis racket base plate. Background Technology

[0002] The baseboard of a table tennis racket, as the basic supporting component of the racket, is usually a composite board made of multiple layers of wood veneer bonded together or wood chips and woven fiber sheets bonded together. Its main performance indicators are elasticity and impact vibration.

[0003] A blade with high elasticity produces a fast and powerful ball, but its weight makes it difficult for players to accelerate the ball. On the other hand, a composite blade with a certain thickness causes greater impact and vibration from the ball, which can negatively affect a player's feel and control, such as shorter ball holding time and unstable ball reception. Furthermore, a blade with high vibration will produce noise when hitting the ball.

[0004] Reducing the weight of the blade while maintaining elasticity helps increase the player's hitting frequency, which is a high-performance indicator pursued by table tennis racket blades. Minimizing vibration and noise is another important indicator pursued by table tennis racket blades. Therefore, it is urgent to develop a blade with good elasticity, light weight, low hitting noise, and low receiving vibration to meet players' needs for high-quality table tennis rackets. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a non-fully bonded table tennis racket blade that has good elasticity, is lightweight, produces low noise when hitting the ball, and minimizes vibration when receiving the ball.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A non-fully glued table tennis racket blade includes multiple layers of single blades. Adjacent single blades are bonded together with a glue layer, which includes a glued area and a non-glue area surrounded by the glued area. By leaving gaps in the glue application, non-glue areas are formed within the glued areas. Compared to the glued layers formed by full-gluing in existing technologies, the glue layer used after bonding is reduced, thus reducing the weight of the table tennis racket blade and lowering glue costs. The non-glue areas form a cavity structure between the bonded single blades. The blade area corresponding to the cavity is more prone to elastic deformation upon impact than other tightly bonded solid areas, thereby increasing the blade's elasticity. The small amount of air within the cavity provides localized damping, preventing the bending waves generated after the table tennis ball impacts the blade from propagating layer by layer along the single blades and absorbing noise, thus reducing vibration and noise.

[0008] The non-adhesive areas on each of the adhesive layers are located in corresponding positions.

[0009] The percentage of the non-adhesive area to the surface area of ​​the adhesive layer is 5%-12%.

[0010] The non-adhesive area is a roughly circular region located at the center of the adhesive layer.

[0011] The non-adhesive area is a ring-shaped region located at the center of the adhesive layer.

[0012] The non-adhesive-coated area consists of multiple discontinuous, roughly circular regions.

[0013] Various circular areas are evenly distributed around the perimeter of the sweet spot corresponding to the glue layer and the blade. Because the blade area corresponding to the non-glue area is more prone to elastic deformation upon impact, the corresponding racket face can return more ball speed upon impact, thereby expanding the corresponding sweet spot area and maximizing the advantages of sweet spot hitting.

[0014] The adhesive layer is applied to the surface of the veneer using screen printing or area masking adhesive application.

[0015] The coating layer is prepared from one or a mixture of two of epoxy resin and phenolic resin.

[0016] This invention has the following beneficial effects: By leaving blank areas in the glued area, this invention creates non-glue zones within the glued area. Compared to the glued layer formed by applying glue to the entire surface in the prior art, the amount of glue used in the glued layer is reduced, thereby reducing the weight of the entire blade and lowering glue costs. The non-glue zones form a cavity structure between the glued blades. Compared to other tightly bonded solid areas, the blade area corresponding to the cavity is more prone to elastic deformation when the ball is hit, thus increasing the elasticity of the blade. The small amount of air in the cavity has a local constraint damping effect, that is, it prevents the bending wave generated after the ping-pong ball hits the blade from propagating layer by layer along the blade and absorbs noise, thereby playing a role in vibration reduction and noise reduction. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of each single plate in this utility model;

[0019] Figure 2 This is a partial cross-sectional schematic diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the adhesive layer on the single board in Example 1;

[0021] Figure 4 This is a schematic diagram of the adhesive layer on the single board in Example 2;

[0022] Figure 5 This is a schematic diagram of the adhesive layer on the single board in Example 3.

[0023] 1. Veneer; 101. Wood chip; 102. Woven fiber sheet; 2. Glue layer; 201. Glue area; 202. Unglued area; 3. Sweet spot. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Currently, there are two types of table tennis racket blades on the market: one is a pure wood blade, and the other is a composite blade made of wood veneer 101 and woven fiber sheet 102. The blade in this design uses a composite of wood veneer 101 and woven fiber sheet 102. Figure 1As shown, a 7-layer baseboard is formed by stacking 7 veneers 1. From top to bottom, the first and second layers are wood chips 101, the third layer is woven fiber sheet 102, the fourth layer is wood chips 101, the fifth layer is woven fiber sheet 102, and the sixth and seventh layers are wood chips 101.

[0028] Figure 2 The displayed base plate is based on Figure 1 A cross-sectional view of a 7-layer composite baseboard made by superimposing and bonding. Two woven fiber sheets 102 are located on the upper and lower sides of the middle wood sheet 101, respectively. The remaining four wood sheets 101 are symmetrically distributed on both sides of the woven fiber sheets 102 with the middle wood sheet 101 as the center. There is an adhesive layer 2 between each veneer 1. The adhesive layer 2 includes an adhesive area 201 and a non-adhesive area 202 surrounded by the adhesive area 201.

[0029] Among them, the preparation of such Figure 2 The processing steps for the 7-layer baseboard shown are: assembly → gluing → pre-pressing → aging → hot pre-pressing → hot pressing. In the gluing process of this scheme, the non-glued area 202 in the glue layer 2 is obtained through a blanking process. One blanking process is screen printing, that is, a non-glued area (blank area) with the same shape and position as the non-glued area 202 is arranged on the template, and the glue is applied to the surface of the veneer 1 by means of the template and the glue application board. Another blanking process is area masking glue application, that is, a sticker with the same shape as the non-glued area 202 is pasted on the surface of the veneer 1 at the preset position of the non-glued area 202 to form a blank area, and then the glue is applied to the surface of the veneer 1. This scheme uses a mixture of epoxy resin or phenolic resin as the adhesive. The adhesive is applied to form an adhesive layer 2. The single blade 1 after adhesive application is simultaneously heat-pressed together. The adhesive layer 2 formed after bonding contains a non-adhesive area 202. Compared with the adhesive layer 2 formed by applying adhesive to the entire surface in the existing technology, the amount of adhesive used is reduced, thereby reducing the weight of the entire table tennis racket blade. The non-adhesive area 202 forms a cavity structure between the single blades 1 of the bonded blade. The blade area corresponding to the cavity is more prone to elastic deformation when hitting the ball compared to other tightly bonded solid areas, thereby increasing the elasticity of the blade. The small amount of air in the cavity has a local constraint damping effect, that is, it prevents the bending wave generated after the table tennis ball hits the blade from propagating layer by layer along the single blade 1, and absorbs noise, thereby playing a role in vibration reduction and noise reduction.

[0030] Further preferably, the positions of the non-glued areas 202 on each of the glued layers 2 correspond to each other to ensure the consistency of the glue application and blanking process. When applying glue to both sides of the single board, the blanking areas on each single board 1 correspond to each other, thereby forming a cavity structure with the same size as the non-glued areas 202.

[0031] like Figure 3 As shown in Embodiment 1, the non-adhesive area 202 is a roughly circular area located at the center of the adhesive layer 2.

[0032] like Figure 4 As shown in Example 2, the non-adhesive area is a ring-shaped region located at the center of the adhesive layer.

[0033] Ru Figure 5 As shown in Example 3, the non-glue area comprises multiple discontinuous, near-circular regions. More preferably, these circular regions are evenly distributed around the perimeter of the glue layer and the sweet spot of the blade. Because the blade area corresponding to the non-glue area is more prone to elastic deformation upon impact, the corresponding racket surface can return more ball speed, thereby expanding the corresponding sweet spot (the sweet spot of a table tennis racket refers to the effective hitting area, typically a cluster of points that can return more than 40% of the ball speed). This maximizes the advantages of hitting the ball in the sweet spot, resulting in the highest energy transfer efficiency. It maximizes the conversion of hitting power into ball speed, minimizes vibration, increases ball speed upon leaving the racket, enhances spin, improves landing point accuracy, and provides a clear feel, aiding in adjusting technical movements.

[0034] like Figure 3 As shown, the non-glued area 202 used in this embodiment is a circular area with a radius of 3cm and a corresponding area of ​​28.3cm2. In the gluing process, the normal amount of glue applied to one side of veneer 1 is approximately 0.03 g / cm2. The area of ​​the non-glued area 202 multiplied by the amount of glue applied is the weight of the single-sided glue saved. In the case of double-sided gluing of veneers, the weight of the glue layer formed between two adjacent veneers is twice the amount of glue applied to one side. Therefore, the weight saved by each glue layer is G. 单 =28.3 x 0.03 x 2 = 1.7 g; The total number of adhesive layers is equal to the total number of base plate layers minus 1. Figure 2 Taking the 7-layer base plate as an example, the weight of glue saved (G) in the non-glue area of ​​the entire base plate 总 =6xG 单 =10.2g, while the average weight of a typical 7-layer baseboard is about 85g. This value is the weight under the condition of full adhesive application. The baseboard prepared by the non-full adhesive method reduces the total weight of the existing fully adhesive baseboard by about 11.6%; thus achieving the purpose of reducing the weight of the baseboard and reducing the amount of adhesive used.

[0035] Figure 3 The surface area of ​​the veneer adhesive layer 2 shown is 240 cm². 2 In this embodiment, the non-adhesive area with a radius of 3cm occupies 11.8% of the adhesive layer surface area. In other embodiments, the non-adhesive area 202 is selected as a central circular region with radii of 2cm and 2.5cm, respectively, with a corresponding area of ​​12.56cm. 2 and 19.625cm 2The corresponding percentages of the non-glued area to the surface area of ​​the glued layer are 5.2% and 8%, respectively. The resulting blades have the advantages of good elasticity, light weight, low hitting noise, and low vibration when receiving the ball.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A non-fully bonded table tennis racket blade, comprising multiple layers of single-layer plywood, wherein adjacent single-layer plywood have an adhesive layer for bonding adjacent single-layer plywood, characterized in that, The adhesive layer includes an adhesive area and a non-adhesive area surrounded by the adhesive area.

2. The non-fully bonded table tennis racket blade according to claim 1, characterized in that, The non-adhesive areas on each of the adhesive layers are located in corresponding positions.

3. A non-fully bonded table tennis racket blade according to claim 1, characterized in that, The percentage of the non-adhesive area to the surface area of ​​the adhesive layer is 5%-12%.

4. A non-fully bonded table tennis racket blade according to any one of claims 1-3, characterized in that, The non-adhesive area is a roughly circular region located at the center of the adhesive layer.

5. A non-fully bonded table tennis racket blade according to any one of claims 1-3, characterized in that, The non-adhesive area is a ring-shaped region located at the center of the adhesive layer.

6. A non-fully bonded table tennis racket blade according to any one of claims 1-3, characterized in that, The non-adhesive-coated area consists of multiple discontinuous, roughly circular regions.

7. A non-fully bonded table tennis racket blade according to claim 4, characterized in that, Various circular areas are evenly distributed around the sweet spot corresponding to the adhesive layer and the base plate.

8. A non-fully bonded table tennis racket blade according to any one of claims 1-3, characterized in that, The adhesive layer is applied to the surface of the veneer using screen printing or area masking adhesive application.

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