A type of injection-molded foam-formed ping-pong paddle

Abstract

This utility model discloses an injection-molded foam-formed table tennis racket, comprising a racket body integrally molded with a blade and handle. The body is made of thermoplastic foam, with 0.5 mm thick carbon fiber layers fixed to both sides. A sponge and rubber layer are sequentially fixed to the carbon fiber layer at the blade position, and a wooden handle is fixed to the carbon fiber layer at the handle position. This structure reduces the racket weight through injection molding foaming and replaces traditional wood with carbon fiber plates, offering advantages such as corrosion resistance, dust-free processing, environmental friendliness (replacing wood), and superior resistance to sudden impacts, thus solving many shortcomings of traditional wooden rackets. Because the racket body is obtained using thermoplastic foaming technology, it is lighter and more compact than wooden rackets.

Description

Technical Field

[0001] This utility model relates to the field of table tennis rackets, and in particular to an injection-molded foam table tennis racket. Background Technology

[0002] Traditional table tennis rackets are mostly made of wood. Over time, wooden rackets absorb sweat and dents, making them prone to damage. Furthermore, wooden rackets require machining, which generates dust and other harmful substances in the manufacturing process. Additionally, wooden table tennis rackets tend to be heavy.

[0003] In order to solve the problems of traditional table tennis rackets, this utility model designs a new structure for table tennis rackets. Utility Model Content

[0004] This utility model provides a new structure for a table tennis racket, aiming to solve the shortcomings of current wooden table tennis rackets, such as easy rot, dust pollution during production, and heavy feel. To achieve the above objectives, this utility model adopts the following technical solution: A table tennis racket made by injection molding foam includes: a racket body integrally formed of a racket blade and a racket handle; the racket body is integrally formed of thermoplastic plastic by injection molding foaming process; carbon fiber layers are fixed to both sides of the racket body, and sponge is fixed to the outer surface of the carbon fiber layers corresponding to the racket blade position; a rubber layer is fixed to the outer surface of the sponge corresponding to the racket blade position; and a wooden handle is fixed to the outer surface of the carbon fiber layers corresponding to the racket handle position.

[0005] Furthermore, the thermoplastic foam is polystyrene, high-impact polystyrene, or polypropylene with added chemical foaming agents.

[0006] Furthermore, the thermoplastic foam contains strength-reinforcing fillers.

[0007] Furthermore, the filler comprises aramid short fibers or chopped carbon fibers.

[0008] Furthermore, the length of the aramid short fibers is 0.5 mm to 3 mm; the length of the chopped carbon fibers is 1 mm to 3 mm.

[0009] Furthermore, the racket body, carbon fiber layer, sponge, rubber layer and wooden handle are fixed with glue.

[0010] Furthermore, the adhesive used to bond the polystyrene racket body and the carbon fiber layer is a two-component low-viscosity epoxy resin adhesive; the adhesive used to bond the high-impact polystyrene racket body and the carbon fiber layer is a two-component polyurethane structural adhesive; and the adhesive used to bond the polypropylene racket body and the carbon fiber layer is a two-component modified acrylic adhesive.

[0011] Furthermore, the thickness of the adhesive is 0.1 mm to 0.3 mm.

[0012] Furthermore, the thickness of the carbon fiber layer is 0.5 mm.

[0013] Compared with existing technologies, this invention has the following advantages: This invention uses a high-strength thermoplastic foam molding process combined with carbon fiber to completely replace traditional wooden table tennis rackets. Compared to traditional wooden rackets, it not only offers advantages such as greater corrosion resistance, no dust pollution during processing, and greater environmental friendliness, but also better resistance to sudden impacts. The biggest advantage is that, because the racket body is made using thermoplastic foaming technology, it is lighter and more compact than wooden rackets. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 Exploded view of the structure of this utility model.

[0015] 1. Racket body, 11. Blade, 12. Handle, 2. Carbon fiber layer, 3. Sponge, 4. Rubber layer, 5. Wooden handle. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0017] like Figure 1 and Figure 2 As shown, this utility model discloses an injection-molded foamed table tennis racket. The specific structure includes a racket body 1 integrally formed from a racket blade 11 and a handle 12. In this design, the racket body 1 is integrally molded using injection molding, completing the handle 12 and racket blade 11 in one step. The racket body is made of thermoplastic injection-molded foamed plastic; specifically, it is polystyrene, high-impact polystyrene, or polypropylene with added chemical foaming agents. To achieve the foaming target of the racket body 1, the chemical foaming agent can be an azo compound, bicarbonate, etc. When heated and melted in the barrel, the foaming agent decomposes to produce gases (such as nitrogen and carbon dioxide). The gases mix with the melt and are injected into the mold, where they expand to form micropores within the cavity.

[0018] To further enhance the strength and toughness of the racket body 1, strength fillers can be added to the injection molding raw material. Specific fillers can be chopped carbon fiber or aramid fiber, more specifically, short carbon fiber fibers with a length of 1mm to 3mm. Fibers that are too short cannot increase strength, while fibers that are too long are prone to agglomeration in the barrel or clogging in narrow runners. Aramid short fibers can also be used, with a length of 0.5mm to 3mm. More specifically, the choice of fiber length depends on the gate diameter; generally, the fiber length should be ≤1 / 2 of the gate diameter.

[0019] To further enhance the strength of the racket body 1 and provide a better user experience, carbon fiber layers 2 are fixed to both sides of the racket body 1. These carbon fiber layers 2 completely cover both sides of the handle 12 and the racket blade 11 of the racket body 1. The carbon fiber layers 2 are fixed to the racket body 1 using adhesive, with an adhesive thickness ranging from 0.1mm to 0.3mm. For racket bodies made of carbon fiber and polystyrene (PS), a two-component low-viscosity epoxy resin adhesive is used; for bonding high-impact polystyrene (HIPS) to carbon fiber, a two-component polyurethane structural adhesive or a modified epoxy resin adhesive with added toughening agents is used; and for bonding polypropylene (PP) to carbon fiber, a two-component modified acrylic adhesive is used.

[0020] Sponge 3 is fixed to the outer surface of the carbon fiber layer 2 at position 11 of the racket. Sponge 3 is only installed at position 11 of the racket; it is not fixed at position 12 of the handle. The carbon fiber layer 2 and sponge 3 are fixed with glue. The glue used for the carbon fiber layer 2 and sponge 3 is divided into two types: removable and permanent. Removable glue can be professional table tennis racket glue, such as Butterfly FreeChack inorganic glue or DHS inorganic glue. For permanent fixation, flexible epoxy resin glue can be used, such as Kingstar MAX-11 epoxy resin AB glue.

[0021] The outer surface of the sponge 3 is bonded to the rubber layer 4. The bonding between the sponge 3 and the rubber layer 4 can be achieved using inorganic and organic adhesives, such as Stiga inorganic adhesive or 729 professional organic adhesive.

[0022] The handle 12 of the racket body 1 is fixed with a wooden handle 5. The wooden handle 5 and the carbon fiber layer 2 are also fixed with glue, which is a permanent fixation.

[0023] In this invention, the carbon fiber layer 2 is permanently bonded to the plastic racket body 1 with glue, which not only makes the racket lighter overall but also makes the force distribution of the overall structure more reasonable. The wooden handle 5 is permanently fixed to the handle 12, and the sponge 3 is fixed to the racket blade 11. When the racket is subjected to force, the force of the ping-pong ball will be distributed to the entire racket through the carbon fiber on the force-bearing side.

[0024] The working principle of this utility model: This application innovatively uses a combination of hot-melt foamed plastic and carbon fiber, which fully utilizes the advantages of the foamed plastic racket body 1 being lightweight and having high local hardness, and combines it with the advantages of the carbon fiber layer 2 being high modulus, lightweight, and high strength.

[0025] The final product of this application is made of both plastic and carbon fiber, which are corrosion-resistant materials. After long-term use, it will not corrode or break due to absorbing too much hand sweat.

[0026] Because the racket body in this application is made of thermoplastic foam, it can be mass-produced, saving a lot of wood.

[0027] The most vulnerable point for traditional wooden table tennis rackets to break is the connection between the handle and the blade. From a force perspective, the instantaneous impact of the blade and the gripping force of the hand at the handle create a point of convergence for torque forces. This point, with its minimal wooden connection, is particularly prone to breakage. The solution proposed in this application uses high-strength adhesive to connect the carbon fiber layer 2 to the plastic racket body 1. When the racket body 1 is impacted by a table tennis ball, the force is instantly distributed across the entire racket surface and racket body 1 via the carbon fiber layer 2. Compared to localized force distribution, the overall force distribution design of this application results in a longer lifespan for the racket compared to wooden table tennis rackets.

Claims

1. A table tennis bat molded by injection foaming, characterized in that, include: The racket body (1) is integrally formed with the racket plate (11) and the handle (12); the thermoplastic foam of the racket body is integrally formed by injection molding foaming process; carbon fiber layer (2) is fixed on both sides of the racket body (1), and sponge (3) is fixed on the outer surface of the carbon fiber layer (2) corresponding to the position of the racket plate (11); rubber layer (4) is fixed on the outer surface of the sponge (3) corresponding to the position of the racket plate (11); A wooden handle (5) is fixed to the outer surface of the carbon fiber layer (2) at the position of the handle (12).

2. The injection foam molded table tennis bat according to claim 1, wherein The racket body (1), carbon fiber layer (2), sponge (3), rubber layer (4) and wooden handle (5) are fixed with glue.

3. The injection foam molded table tennis bat according to claim 2, wherein The thickness of the adhesive is 0.1 mm to 0.3 mm.

4. The injection foam molded table tennis bat according to claim 1, wherein The thickness of the carbon fiber layer (2) is 0.5 mm.

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