Pick racket with foam core vortex linear structure and preparation method thereof

Abstract

The invention provides a Pick racket with a foam core vortex linear structure and a preparation method of the Pick racket, and belongs to the technical field of Pick rackets. The Pick racket with the foam core vortex linear structure comprises a covered edge, two Pick racket panels packaged in the covered edge and a polyurethane cellular board packaged between the two Pick racket panels, and further comprises a handle which is fixedly arranged at one end of the covered edge, one ends of the two Pick racket panels and one end of the polyurethane cellular board in a sleeving mode at the same time. A through groove is formed in the polyurethane cellular board, and a foam core vortex-shaped linear structure is installed in the through groove. According to the Pick racket with the foam core and the vortex linear structure, the comprehensive effects of high elasticity, high resilience, light weight, good flexibility, excellent mechanical property and long service life are achieved, and the performance and the use experience of the Pick racket are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of pickle ball racket preparation, and in particular to a pickle ball racket with a foam core vortex linear structure and a preparation method thereof. Background Art

[0002] Pickleball is a sport of hitting a ball with a racket. It originated from Benbridge Island in Seattle, USA. It was invented by two people. The name of pickleball comes from a dog of one of the inventors; when the game was first invented, the dog named Pickle often ran with the ball in his mouth.

[0003] Pickleball rackets are used to hit pickleball. Traditional pickleball rackets have the following technical problems in the design and manufacturing process:

[0004] 1. Insufficient elasticity and resilience:

[0005] The materials and structural design of traditional pickleball rackets make it difficult to achieve efficient energy storage and release. The elastic modulus is low and the rebound rate is usually less than 70%, resulting in insufficient hitting power and large energy loss, which affects the hitting effect.

[0006] 2. Limited weight and flexibility:

[0007] Traditional pickleball rackets are mostly made of a single material or simple composite materials. They are heavy overall, have limited swing speed, and poor flexibility, making it difficult to meet the needs of high-intensity competitions.

[0008] 3. The mechanical properties of the core are unbalanced:

[0009] The core structure design of traditional pickleball rackets is simple, the stress distribution is uneven, the ratio of bending stiffness to shear stiffness is unreasonable, the impact resistance is poor, and local stress concentration is prone to occur, resulting in deformation or damage to the racket surface.

[0010] 4. Short service life:

[0011] Traditional pickleball rackets have low material interface bonding strength, limited fatigue life, and significant performance degradation in hot and humid environments. They have a short service life and are difficult to meet long-term use requirements.

[0012] 5. Insufficient hitting power and stability:

[0013] Traditional pickleball rackets have low energy transfer efficiency, dispersed hitting force, and lack of effective vibration suppression design, resulting in poor hitting stability and insufficient ball control accuracy.

[0014] In response to the above problems, the present invention provides a pickle ball racket with a foam core vortex linear structure and a preparation method thereof. Through innovative material combination and structural design, the elasticity, rebound performance, lightweight, mechanical properties and service life of the pickle ball racket are significantly improved, the technical defects of the traditional pickle ball racket are solved, and the demand for high-performance pickle ball rackets is met. Summary of the invention

[0015] The present invention aims to solve the problems raised in the background technology and provides a pickle ball racket with a foam core vortex linear structure and a preparation method thereof.

[0016] The specific technical solutions are as follows:

[0017] A pickle ball racket with a foam core spiral linear structure comprises: an edge binding, two pickle ball racket panels encapsulated inside the edge binding, and a polyurethane honeycomb panel encapsulated between the two pickle ball racket panels, and also comprises a handle fixedly mounted on one end of the edge binding, one end of the two pickle ball racket panels, and one end of the polyurethane honeycomb panel. A through groove is formed on the polyurethane honeycomb panel, and the foam core spiral linear structure is installed in the through groove.

[0018] The above-mentioned pickle ball racket with a foam core spiral linear structure, wherein: the foam core spiral linear structure includes a carbon fiber cloth cover, EVA strips and PU foam strips, the EVA strips are interspersed inside the carbon fiber cloth cover, and the PU foam strips are arranged on the outside of the carbon fiber cloth cover. After the PU foam strips are located on the outside of the carbon fiber cloth cover, the carbon fiber cloth cover, EVA strips and PU foam strips are simultaneously wound to form a spiral linear shape, and then the spiral linear foam core structure is placed in the through groove on the polyurethane honeycomb plate, and then the foam core spiral linear structure is compacted and flattened in the through groove using a hot press.

[0019] The present invention also provides a method for preparing a pickle ball racket having a foam core vortex linear structure, comprising the following steps:

[0020] S1: hot pressing the foam core vortex linear structure into the through groove on the polyurethane honeycomb board and flattening it;

[0021] S2: Using glue, glue the polyurethane honeycomb panel in step S1 between two pickle ball racket panels to form a combination body 1;

[0022] S3: fixing the hemming onto the outer edge of the assembly 1 formed in step S2 to form an assembly 2;

[0023] S4: Fixing the handle on one end of the second assembly, that is, fixing the handle on one end of the edging, one end of the two pickle ball racket panels, and one end of the polyurethane honeycomb panel at the same time.

[0024] The method for preparing the pickle ball racket having the foam core spiral linear structure, wherein: the braiding density of the carbon fiber cloth cover is 200-300g / m 2 , and the ratio of warp to weft fiber density is 1:1.2, the Shore hardness of the EVA strip is 55-65HA, and the density of the PU foam strip is 0.25-0.35g / cm 3 .

[0025] The above-mentioned method for preparing a pickle ball racket with a foam core spiral linear structure, wherein: the through groove is formed by laser cutting, and its diameter is 1.05-1.1 times the diameter of the foam core spiral linear structure, and the inner wall of the groove has a serrated structure to enhance mechanical bite.

[0026] The method for preparing the pickle ball racket with the foam core spiral linear structure is as follows: the spiral angle of the spiral linear structure is 15°-25°, the spacing between adjacent spiral lines is 3-5mm, and the end of the spiral line extends to 10-15mm away from the inner edge of the hemming.

[0027] The above-mentioned method for preparing a pickle ball racket with a foam core vortex linear structure, wherein: the hot pressing process parameters in step S1 are: temperature 85-95°C, pressure 0.8-1.2MPa, holding time 90-120 seconds, and the cooling rate after hot pressing does not exceed 5°C / min.

[0028] The method for preparing the above-mentioned pickle ball racket with a foam core spiral linear structure, wherein: the outer surface of the pickle ball racket panel is coated with a nano-silicon dioxide anti-slip coating, the coating thickness is 20-30 μm, and the surface friction coefficient is ≥0.85.

[0029] The method for preparing the pickle ball racket with a foam core spiral linear structure is as follows: the honeycomb pore size of the polyurethane honeycomb panel is 2-3 mm, the wall thickness is 0.15-0.25 mm, and the honeycomb axis is cross-arranged at 45° with the racket surface.

[0030] The method for preparing the pickle ball racket with the foam core spiral linear structure is as follows: the carbon fiber cloth cover is coated with an interface treatment agent containing a silane coupling agent after being surface treated with plasma, and the solid content of the treatment agent is 8-12wt%.

[0031] The preparation method of the above-mentioned pickle ball racket with a foam core spiral linear structure, wherein: the edge binding uses a TPU composite material reinforced with shape memory alloy wire, the alloy wire has a diameter of 0.3-0.5mm, a pre-deformation of 2-3%, and 4-6 wires are evenly distributed along the circumference of the edge binding.

[0032] The method also includes vacuum coating treatment on the second surface of the assembly, depositing a Cr transition layer of 50-80 nm and a diamond-like carbon film of 1-2 μm in sequence, with the coating temperature being ≤80°C.

[0033] The handle is embedded with a piezoelectric ceramic sensor array, which is connected to the Bluetooth module inside the racket body through a flexible circuit to monitor the strength and frequency of the ball in real time.

[0034] A dynamic balance calibration process is added after step S4: the finished racket is placed on a vibration table, the amplitude distribution of the racket surface is detected by a laser displacement sensor, and holes are drilled in the amplitude deviation area to inject counterweight beads.

[0035] The glue is a two-component polyurethane adhesive, component A contains terminal isocyanate prepolymer with an NCO content of 12-15%, and component B is an epoxy resin modified body containing an amine chain extender, and the mixing ratio is 1:0.8-1.2.

[0036] The present invention has the following beneficial effects:

[0037] The pickleball racket with a foam core vortex linear structure provided by the present invention has the following technical effects:

[0038] 1. High elasticity and high resilience:

[0039] Through the combined design of the foam core spiral linear structure and the polyurethane honeycomb panel, the pickle ball racket can achieve efficient energy storage and release when hitting the ball, with the elastic modulus increased by 20%-30% and the rebound rate reaching more than 85%, ensuring more powerful hitting power and reducing energy loss by 15%-20%.

[0040] 2. Lightweight and flexibility:

[0041] The low-density structure of polyurethane honeycomb panels (0.25-0.35g / cm 3 ) and the lightweight design of the foam core vortex linear structure 5 reduce the overall weight of the pickleball racket by 25%-30%, while maintaining excellent mechanical properties, improving flexibility and increasing the swing speed by 10%-15%.

[0042] 3. Excellent core elasticity and mechanical properties:

[0043] The spiral angle (15°-25°) and spacing (3-5mm) of the spiral linear structure 5 optimize the stress distribution of the racket core, so that the ratio of the bending stiffness to the shear stiffness of the racket surface reaches 1.2-1.5, the impact resistance is improved by 40%, and the mechanical properties are more balanced.

[0044] 4. Long service life:

[0045] The composite structure design of carbon fiber cloth cover, EVA strips and PU foam strips, combined with hot pressing process (85-95℃, 0.8-1.2MPa), increases the interface bonding strength by 30%, extends the fatigue life to more than 3 times that of ordinary structures, and the performance retention rate after wet heat aging is >85%.

[0046] 5. Hitting power and stability:

[0047] The energy transfer efficiency of the vortex linear structure is increased by 20%, and the hitting force is more concentrated. At the same time, the fixed design of the edging and the handle ensures stability during hitting, reduces vibration transmission, and improves ball control accuracy.

[0048] In summary, the pickle ball racket with a foam core vortex linear structure prepared by the present invention achieves the comprehensive effects of high elasticity, high rebound, light weight, good flexibility, excellent mechanical properties and long service life, which significantly improves the performance and usage experience of the pickle ball racket. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of the structure of a pickleball racket with a foam core vortex linear structure provided by an embodiment of the present invention;

[0050] Figure 2 A schematic diagram of the exploded structure of a pickleball racket having a foam core vortex linear structure provided by an embodiment of the present invention;

[0051] Figure 3 A schematic diagram of a partial exploded structure of a pickleball racket having a foam core vortex linear structure provided by an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of the structure of a foam core spiral linear structure provided by an embodiment of the present invention;

[0053] Figure 5 A schematic diagram of the exploded structure of the foam core vortex linear structure provided in an embodiment of the present invention.

[0054] In the attached figure:

[0055] 1. Polyurethane honeycomb panel; 101. Through groove; 2. Pickle ball racket panel; 3. Edge binding; 4. Handle; 5. Foam core spiral linear structure; 501. Carbon fiber cloth cover; 502. EVA strip; 503. PU foam strip. DETAILED DESCRIPTION

[0056] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0057] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0058] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0059] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The pickleball racket provided in this embodiment has a foam core spiral linear structure, such as Figure 1-Figure 5 As shown, the pickle ball racket includes an edge binding 3, two pickle ball racket panels 2 encapsulated inside the edge binding 3, and a polyurethane honeycomb panel 1 encapsulated between the two pickle ball racket panels 2, and also includes a handle 4 fixedly mounted on one end of the edge binding 3, one end of the two pickle ball racket panels 2, and one end of the polyurethane honeycomb panel 1. A through groove 101 is opened on the polyurethane honeycomb panel 1, and a foam core spiral linear structure 5 is installed in the through groove 101.

[0061] Among them, the foam core spiral linear structure 5 includes a carbon fiber cloth cover 501, an EVA strip 502 and a PU foam strip 503, the EVA strip 502 is interspersed inside the carbon fiber cloth cover 501, and the PU foam strip 503 is arranged on the outside of the carbon fiber cloth cover 501. After the PU foam strip 503 is located on the outside of the carbon fiber cloth cover 501, the carbon fiber cloth cover 501, the EVA strip 502 and the PU foam strip 503 are simultaneously wound to form a spiral linear shape, and then the spiral linear foam core spiral linear structure 5 is placed in the through groove 101 on the polyurethane honeycomb panel 1, and then the foam core spiral linear structure 5 is compacted and flattened in the through groove 101 using a hot press.

[0062] The preparation method of the above-mentioned pickleball racket with a foam core vortex linear structure is as follows:

[0063] S1: hot pressing the foam core spiral linear structure 5 into the through groove 101 on the polyurethane honeycomb panel 1 and flattening it;

[0064] S2: Using glue, glue the polyurethane honeycomb panel 1 in step S1 between two pickle ball racket panels 2 to form a combination body 1;

[0065] S3: fixing the edge 3 onto the outer edge of the assembly 1 formed in step S2 to form an assembly 2;

[0066] S4: The handle 4 is fixedly sleeved on one end of the second assembly, that is, the handle 4 is fixedly sleeved on one end of the edge 3, one end of the two pickle ball racket panels 2 and one end of the polyurethane honeycomb panel 1 at the same time.

[0067] The pickleball racket with a foam core vortex linear structure prepared by the above scheme has the following technical effects:

[0068] 1. High elasticity and high resilience:

[0069] Through the combined design of the foam core spiral linear structure 5 and the polyurethane honeycomb panel 1, the pickle ball racket can achieve efficient energy storage and release when hitting the ball, with the elastic modulus increased by 20%-30% and the rebound rate reaching more than 85%, ensuring more powerful hitting and reducing energy loss by 15%-20%.

[0070] 2. Lightweight and flexibility:

[0071] The low-density structure of polyurethane honeycomb panel 1 (0.25-0.35g / cm 3 ) and the lightweight design of the foam core vortex linear structure 5 reduce the overall weight of the pickleball racket by 25%-30%, while maintaining excellent mechanical properties, improving flexibility and increasing the swing speed by 10%-15%.

[0072] 3. Excellent core elasticity and mechanical properties:

[0073] The spiral angle (15°-25°) and spacing (3-5mm) of the spiral linear structure 5 optimize the stress distribution of the racket core, so that the ratio of the bending stiffness to the shear stiffness of the racket surface reaches 1.2-1.5, the impact resistance is improved by 40%, and the mechanical properties are more balanced.

[0074] 4. Long service life:

[0075] The composite structure design of the carbon fiber cloth sleeve 501, EVA strip 502 and PU foam strip 503, combined with the hot pressing process (85-95°C, 0.8-1.2MPa), increases the interface bonding strength by 30%, extends the fatigue life to more than 3 times that of the ordinary structure, and the performance retention rate after wet heat aging is >85%.

[0076] 5. Hitting power and stability:

[0077] The energy transmission efficiency of the vortex linear structure (5) is increased by 20%, and the hitting force is more concentrated. At the same time, the fixing design of the edge (3) and the handle (4) ensures the stability during hitting, reduces vibration transmission, and improves ball control accuracy.

[0078] In summary, the pickle ball racket with a foam core spiral linear structure prepared in this embodiment achieves the comprehensive effects of high elasticity, high rebound, light weight, good flexibility, excellent mechanical properties and long service life, which significantly improves the performance and usage experience of the pickle ball racket.

[0079] It is worth noting that the carbon fiber cloth sleeve 501 may also be made directly of carbon fiber cloth, and the carbon fiber cloth may be directly wrapped around the outside of the EVA strip 502 .

[0080] Specifically, in this embodiment, the weaving density of the carbon fiber cloth sleeve 501 is 200-300g / m 2 , and the fiber density ratio of warp to weft is 1:1.2, the Shore hardness of EVA strip 502 is 55-65HA, and the density of PU foam strip 503 is 0.25-0.35g / cm 3 .

[0081] By limiting the weaving density of the carbon fiber sleeve (200-300g / m 2 ) and warp-weft ratio (1:1.2), optimize the mechanical anisotropy of fiber distribution, so that the structure has balanced bending stiffness when subjected to multi-directional stress; EVA strip hardness (55-65HA) and PU foam density (0.25-0.35g / cm 3 ) can reduce energy loss while ensuring elastic recovery rate, and increase the vibration attenuation rate of hitting the ball by 15%-20%.

[0082] Specifically, in this embodiment, the through groove 101 is formed by laser cutting, and its diameter is 1.05-1.1 times the diameter of the foam core spiral linear structure 5, and the inner wall of the groove has a serrated structure to enhance mechanical bite.

[0083] The diameter tolerance control of the laser-cut through-slot (1.05-1.1 times) combined with the serrated inner wall design increases the interface shear strength between the foam core structure and the honeycomb panel by more than 30%, suppresses the risk of delamination through the mechanical interlocking effect, and reduces stress concentration during hot pressing.

[0084] Specifically, in this embodiment, the spiral angle of the spiral line is 15°-25°, the distance between adjacent spiral lines is 3-5 mm, and the end of the spiral line extends to 10-15 mm away from the inner edge of the hem 3.

[0085] The spiral linear layout with a helix angle of 15°-25° and a spacing of 3-5mm makes the stress distribution on the racket surface conform to the principle of equal strength design, reducing the local peak stress by 40%; the end extends to 10-15mm inside the edge, forming a progressive stiffness transition zone to avoid edge peeling failure.

[0086] Specifically, in this embodiment, the hot pressing process parameters in step S1 are: temperature 85-95° C., pressure 0.8-1.2 MPa, holding time 90-120 seconds, and cooling rate after hot pressing not exceeding 5° C. / min.

[0087] The hot pressing temperature of 85-95℃ matches the glass transition temperature range of polyurethane, the pressure of 0.8-1.2MPa ensures sufficient flow and filling of the material, the holding time of 90-120 seconds allows the interface molecular chains to fully diffuse, and the cooling rate control of ≤5℃ / min eliminates thermal residual stress. The interface peel strength can reach more than 8.5N / mm.

[0088] Specifically, in this embodiment, the outer surface of the pickle ball racket panel 2 is coated with a nano-silicon dioxide anti-slip coating, the coating thickness is 20-30 μm, and the surface friction coefficient is ≥0.85.

[0089] The nano-silica anti-slip coating (20-30μm) constructs a multi-level rough structure through surface micro-convexities. The viscous effect with a friction coefficient ≥ 0.85 improves the racket rotation control accuracy by 25%, while maintaining a 90% transmittance without affecting the panel texture recognition.

[0090] Specifically, in this embodiment, the honeycomb aperture of the polyurethane honeycomb panel 1 is 2-3 mm, the wall thickness is 0.15-0.25 mm, and the honeycomb axis is cross-arranged at 45° with the plane.

[0091] The honeycomb axes are arranged crosswise at 45° to form a quasi-isotropic structure. Combined with a 2-3mm aperture and a 0.15-0.25mm wall thickness, the ratio of the racket surface bending stiffness to the in-plane shear stiffness is optimized to 1.2-1.5, effectively suppressing in-plane distortion during hitting the ball.

[0092] Specifically, in this embodiment, after the carbon fiber cloth sleeve 501 is subjected to plasma surface treatment, it is coated with an interface treatment agent containing a silane coupling agent, and the solid content of the treatment agent is 8-12 wt %.

[0093] Plasma treatment increases the surface energy of carbon fiber by more than 50%, 8-12wt% silane coupling agent forms chemical bridges at the interface, the interface shear strength is increased from 12MPa to 18MPa, and the performance retention rate after wet heat aging is >85%.

[0094] Specifically, in this embodiment, the edge wrapping 3 is made of a TPU composite material reinforced with shape memory alloy wires, the alloy wires have a diameter of 0.3-0.5 mm, a pre-deformation amount of 2-3%, and 4-6 wires are evenly distributed along the circumference of the edge wrapping.

[0095] The pre-deformation (2-3%) design of shape memory alloy wire (0.3-0.5mm) in TPU matrix enables the edge to recover its shape through martensitic reverse phase transformation after impact, with an energy absorption efficiency of 85kJ / m 3 , 3 times higher than traditional TPU edging.

[0096] Specifically, in this embodiment, vacuum coating treatment is also performed on the second surface of the assembly to deposit a Cr transition layer of 50-80 nm and a diamond-like carbon film of 1-2 μm in sequence, with the coating temperature being ≤80°C.

[0097] The Cr transition layer (50-80nm) enhances the film-base bonding strength to HF1 level through metal bonding, and the diamond-like carbon film (1-2μm) makes the surface hardness reach HV2500, reduces the friction coefficient to 0.12, and extends the wear life to 8 times that of ordinary coatings.

[0098] Specifically, in this embodiment, a piezoelectric ceramic sensor array is embedded in the handle 4 and connected to a Bluetooth module inside the racket body through a flexible circuit for real-time monitoring of the hitting force and frequency.

[0099] The piezoelectric ceramic sensor array achieves a strain-to-charge conversion efficiency of >85% through a flexible circuit. The Bluetooth module transmits batting data at a sampling rate of 100Hz, can resolve 0.1N force resolution and 5ms time accuracy, and supports digital modeling of training movements.

[0100] Specifically, in this embodiment, a dynamic balance calibration process is added after step S4: the finished racket is placed on a vibration table, the amplitude distribution of the racket surface is detected by a laser displacement sensor, and holes are drilled in the amplitude deviation area to inject counterweight beads.

[0101] Dynamic balance calibration uses vibration table excitation (20-2000Hz) combined with a laser displacement sensor (0.1μm resolution) to identify areas where the amplitude difference on the racket surface is greater than 15%. Counterweight microbeads (0.1g accuracy) are injected to reduce the mass distribution unevenness to less than 2%, and the vibration mode consistency is improved by 40%.

[0102] The glue is a two-component polyurethane adhesive, component A contains terminal isocyanate prepolymer with an NCO content of 12-15%, and component B is an epoxy resin modified body containing an amine chain extender, and the mixing ratio is 1:0.8-1.2.

[0103] The stoichiometric ratio of the NCO content (12%-15%) and the amino chain extender in the two-component adhesive is controlled so that the cured crosslinking density reaches more than 85%, the T-peel strength reaches 45N / cm, and the operating period is maintained at 30 minutes to meet the assembly process requirements.

[0104] In summary, the pickle ball racket with a foam core vortex linear structure and the preparation method thereof provided in this embodiment have the following advantages:

[0105] The prepared pickle ball racket with a foam core vortex linear structure achieves the comprehensive effects of high elasticity, high rebound, light weight, good flexibility, excellent mechanical properties and long service life, which significantly improves the performance and usage experience of the pickle ball racket.

[0106] In order to further verify the pickle ball racket with a foam core spiral linear structure provided by this embodiment and its technical effect, the following supplementary experimental data and test results are provided to support its technical advantages:

[0107] 1. High elasticity and high resilience performance test

[0108] Test method: Dynamic mechanical analyzer (DMA) was used to test the elastic modulus and rebound rate of the pickle ball racket.

[0109] Experimental results:

[0110] Elastic modulus: The traditional pickle ball racket is 12-15 GPa, while the pickle ball racket prepared in this embodiment is 18-20 GPa, which is increased by 20%-30%.

[0111] Rebound rate: the traditional pickle ball racket is 70%-75%, and the pickle ball racket prepared in this embodiment is 85%-88%, which is increased by 15%-20%.

[0112] Energy loss: the traditional pickleball racket is 25%-30%, while the pickleball racket prepared in this embodiment is 10%-15%, which is reduced by 15%-20%.

[0113] 2. Lightweight and flexibility test

[0114] Test method: The weight of the pickleball racket was measured using an electronic balance, and the swing speed was recorded using a high-speed camera.

[0115] Experimental results:

[0116] Weight: The traditional pickleball racket is 250-280g, while the pickleball racket prepared in this embodiment is 180-200g, which is 25%-30% lighter.

[0117] Swing speed: The traditional pickle ball racket is 15-18 m / s, while the pickle ball racket prepared in this embodiment is 18-21 m / s, which is increased by 10%-15%.

[0118] 3. Test of the elasticity and mechanical properties of the racket core

[0119] Test method: Three-point bending test and shear test are used to test the bending stiffness and shear stiffness of the racket core.

[0120] Experimental results:

[0121] The ratio of bending stiffness to shear stiffness is 0.8-1.0 for conventional pickleball rackets, and 1.2-1.5 for the pickleball rackets prepared in this embodiment, which is optimized by 40%.

[0122] Impact resistance: The traditional pickle ball racket cracks after 1000 impacts, while the pickle ball racket prepared in this embodiment has no obvious damage after 3000 impacts, and the impact resistance is improved by 40%.

[0123] 4. Service life test

[0124] Test method: The durability of pickle ball rackets was tested by wet heat aging test (85°C / 85%RH) and fatigue test (1 million cycles).

[0125] Experimental results:

[0126] Performance retention rate after wet heat aging: the traditional pickle ball racket is 60%-70%, and the pickle ball racket prepared in this embodiment is 85%-90%, which is increased by 25%-30%.

[0127] Fatigue life: The traditional pickle ball racket has 500,000 cycles, while the pickle ball racket prepared in this embodiment has 1.5 million cycles, which is extended to 3 times.

[0128] 5. Hitting power and stability test

[0129] Test method: Use high-speed force sensors and acceleration sensors to test the hitting force and vibration transmission.

[0130] Experimental results:

[0131] Energy transfer efficiency: the traditional pickleball racket is 75%-80%, while the pickleball racket prepared in this embodiment is 90%-95%, an increase of 20%.

[0132] Vibration transmission: The vibration amplitude of a traditional pickleball racket is 0.5-0.8 mm, while that of the pickleball racket prepared in this embodiment is 0.2-0.3 mm, which is reduced by 50%-60%.

[0133] 6. Performance test of carbon fiber cover, EVA strip and PU foam strip

[0134] Test method: tensile test and dynamic mechanical analysis are used to test the interface bonding strength and energy loss.

[0135] Experimental results:

[0136] Interface bonding strength: the traditional structure is 12MPa, and the structure prepared in this embodiment is 18MPa, which is increased by 30%.

[0137] The attenuation rate of the vibration of hitting the ball: the traditional structure is 20%-25%, and the structure prepared in this embodiment is 5%-10%, which is improved by 15%-20%.

[0138] 7. Performance test of through slot and vortex linear structure

[0139] Test method: Shear test and finite element analysis are used to test the interface shear strength and stress distribution.

[0140] Experimental results:

[0141] Interface shear strength: the traditional structure is 8MPa, and the structure prepared in this embodiment is 12MPa, which is increased by 30%.

[0142] Local peak stress: the traditional structure is 150 MPa, and the structure prepared in this embodiment is 90 MPa, which is reduced by 40%.

[0143] 8. Hot pressing process performance test

[0144] Test method: The peeling test is used to test the interfacial peeling strength.

[0145] Experimental results:

[0146] Interface peeling strength: the traditional process is 5N / mm, and the pickle ball racket prepared in this embodiment is 8.5N / mm, which is increased by 40%.

[0147] 9. Nano-silicon dioxide anti-slip coating performance test

[0148] Test method: Use friction coefficient tester and light transmittance tester to test coating performance.

[0149] Experimental results:

[0150] Friction coefficient: the conventional coating is 0.6-0.7, while the coating prepared in this embodiment is 0.85-0.9, an increase of 25%.

[0151] Light transmittance: the traditional coating is 80%-85%, while the coating prepared in this embodiment is 90%-92%, an increase of 10%.

[0152] 10. Shape memory alloy wire reinforced edge performance test

[0153] Test method: Use impact test to test energy absorption efficiency.

[0154] Experimental results:

[0155] Energy absorption efficiency: traditional hemming is 25kJ / m 3 The edge wrapping prepared in this embodiment is 85kJ / m 3 , increased by 3 times.

[0156] 11. Vacuum coating performance test

[0157] Test method: Use hardness tester and friction and wear test to test coating performance.

[0158] Experimental results:

[0159] Surface hardness: The conventional coating is HV1500, while the coating prepared in this embodiment is HV2500, which is increased by 60%.

[0160] Friction coefficient: the conventional coating is 0.3-0.4, while the coating prepared in this embodiment is 0.12, which is reduced by 60%-70%.

[0161] Wear life: The traditional coating has a lifespan of 5,000 cycles, while the coating prepared in this embodiment has a lifespan of 40,000 cycles, which is extended by 8 times.

[0162] 12. Dynamic balance calibration performance test

[0163] Test method: Use a vibration table and laser displacement sensor to test the unevenness of mass distribution.

[0164] Experimental results:

[0165] Mass distribution unevenness: the conventional pickleball racket is 5%-8%, while the pickleball racket prepared in this embodiment is 1%-2%, which is reduced by 60%-80%.

[0166] Vibration modal consistency: the traditional pickleball racket is 60%-70%, and the pickleball racket prepared in this embodiment is 90%-95%, an increase of 40%.

[0167] 13. Glue performance test

[0168] Test method: The T-peel strength is tested by peel test.

[0169] Experimental results:

[0170] T-peel strength: the traditional glue is 30N / cm, and the glue prepared in this embodiment is 45N / cm, which is increased by 50%.

[0171] Summarize

[0172] Through the above experimental data, the pickle ball racket with a foam core spiral linear structure provided in this embodiment shows significant advantages in elasticity, rebound performance, lightness, mechanical properties, service life, hitting power and stability, etc., verifying the reliability and advancement of its technical effects.

[0173] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A pickleball racket having a foam core vortex linear structure, characterized in that: The invention comprises an edge wrapping (3), two pickle ball racket panels (2) encapsulated in the edge wrapping (3), and a polyurethane honeycomb panel (1) encapsulated between the two pickle ball racket panels (2), and also comprises a handle (4) fixedly mounted on one end of the edge wrapping (3), one end of the two pickle ball racket panels (2), and one end of the polyurethane honeycomb panel (1); a through groove (101) is provided on the polyurethane honeycomb panel (1), and a foam core spiral linear structure (5) is installed in the through groove (101).

2. The pickleball racket with a foam core spiral linear structure according to claim 1, characterized in that: The foam core spiral linear structure (5) comprises a carbon fiber cloth sleeve (501), an EVA strip (502) and a PU foam strip (503), wherein the EVA strip (502) is inserted into the interior of the carbon fiber cloth sleeve (501), and the PU foam strip (503) is arranged on the outside of the carbon fiber cloth sleeve (501). After the PU foam strip (503) is located on the outside of the carbon fiber cloth sleeve (501), the carbon fiber cloth sleeve (501), the EVA strip (502) and the PU foam strip (503) are simultaneously rolled to form a spiral linear shape, and then the spiral linear foam core spiral linear structure (5) is placed into a through groove (101) on a polyurethane honeycomb panel (1), and then a hot press is used to compact and flatten the foam core spiral linear structure (5) in the through groove (101).

3. A method for preparing a pickle ball racket having a foam core spiral linear structure as claimed in claim 2, characterized in that: The steps include: S1: hot pressing the foam core spiral linear structure (5) into the through groove (101) on the polyurethane honeycomb panel (1) and flattening it; S2: using glue to glue the polyurethane honeycomb panel (1) in step S1 between two pickle ball racket panels (2) to form a combination body 1; S3: fixing the hemming (3) onto the outer edge of the assembly 1 formed in step S2 to form an assembly 2; S4: The handle (4) is fixedly mounted on one end of the second assembly, that is, the handle (4) is simultaneously fixedly mounted on one end of the edging (3), one end of the two pickleball racket panels (2), and one end of the polyurethane honeycomb panel (1).

4. The method for preparing a pickle ball racket having a foam core spiral linear structure according to claim 3, characterized in that: The braiding density of the carbon fiber cloth sleeve (501) is 200-300 g / m 2 , and the ratio of warp to weft fiber density is 1:1.2, the Shore hardness of the EVA strip (502) is 55-65HA, and the density of the PU foam strip (503) is 0.25-0.35g / cm 3 .

5. The method for preparing a pickle ball racket having a foam core spiral linear structure according to claim 3, characterized in that: The through groove (101) is formed by laser cutting, and its diameter is 1.05-1.1 times the diameter of the foam core spiral linear structure (5), and the inner wall of the groove has a serrated structure to enhance mechanical engagement.

6. The method for preparing a pickle ball racket having a foam core spiral linear structure according to claim 3, characterized in that: The spiral angle of the spiral line is 15°-25°, the distance between adjacent spiral lines is 3-5 mm, and the end of the spiral line extends to a distance of 10-15 mm from the inner edge of the hemming (3).

7. The method for preparing a pickle ball racket having a foam core spiral linear structure according to claim 3, characterized in that: The hot pressing process parameters in step S1 are: temperature 85-95°C, pressure 0.8-1.2MPa, holding time 90-120 seconds, and cooling rate after hot pressing not exceeding 5°C / min.

8. The method for preparing a pickle ball racket having a foam core spiral linear structure according to claim 3, characterized in that: The outer surface of the pickle ball racket panel (2) is coated with a nano-silicon dioxide anti-slip coating, the coating thickness is 20-30 μm, and the surface friction coefficient is ≥0.

85.

9. The method for preparing a pickle ball racket having a foam core spiral linear structure according to claim 3, characterized in that: The polyurethane honeycomb panel (1) has a honeycomb aperture of 2-3 mm, a wall thickness of 0.15-0.25 mm, and a honeycomb axis and a beating surface arranged crosswise at 45°.

10. The method for preparing a pickle ball racket having a foam core spiral linear structure according to claim 3, characterized in that: After the carbon fiber cloth sleeve (501) is subjected to plasma surface treatment, it is coated with an interface treatment agent containing a silane coupling agent, the solid content of the treatment agent being 8-12wt%. The hemming (3) is made of a TPU composite material reinforced with a shape memory alloy wire, the alloy wire having a diameter of 0.3-0.5mm, a pre-deformation of 2-3%, and 4-6 wires being evenly distributed along the circumference of the hemming.

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