Ball structure with high elasticity and high restorability

Abstract

The invention relates to the field of sports goods, in particular to a high-elasticity and high-restorability ball structure which comprises a foaming ball center, the foaming ball center is provided with a reinforcing layer, and a plurality of patch spherical surfaces are attached to the periphery of the foaming ball center. The foaming sphere center or / and the patch sphere surface can be prepared by adopting a supercritical foaming process. According to the process, the uniformity of roundness and excellent elasticity and restorability are achieved during machining, and the uniformity of the roundness is better guaranteed after external force impact.

Description

Technical Field

[0001] The present invention relates to the field of sports goods, and in particular to a ball structure with high elasticity and high recovery. Background Art

[0002] In the prior art, the structures and materials of balls used for competitions and training are diverse. Generally speaking, these balls are mainly made of polyvinyl chloride (PVC), rubber, or rubber-plastic copolymer materials. Although these materials have certain elasticity, they have exposed many shortcomings in actual use.

[0003] For example, in the case of existing inflatable balls, the cavity wrapping layer of the ball is formed by vulcanizing multiple pieces of rubber. However, this has the disadvantage of easily causing air leakage in the ball cavity due to rubber aging, or the rubber itself will still age due to environmental factors after vulcanization, causing the shape of the ball cavity wrapping layer to change, and it is impossible to maintain good fixation of the cavity and maintain the consistency of roundness.

[0004] Secondly, these spheres have a relatively short lifespan due to limitations in the inherent properties of the materials and the manufacturing process. In actual use, due to deficiencies in material protection and aging resistance, the spheres are prone to deformation and weakening of elasticity, which reduces their lifespan and increases maintenance costs.

[0005] Furthermore, the traditional sphere manufacturing process typically involves multiple complex steps, such as material preparation, molding, inflation, sealing, and testing. Each step requires precise control and close integration between processes. If a step goes wrong, the entire process may need to be restarted, resulting in low overall production efficiency.

[0006] For example, the inflation process and the subsequent deflation test are indispensable parts of sphere manufacturing, but these steps are relatively time-consuming. Inflation requires ensuring that the pressure inside the sphere meets the standard, while the deflation test is to verify the sealing performance of the sphere, which increases the overall manufacturing time. In addition, due to the complicated preparation process and long production time, traditional sphere manufacturing often requires more staff to divide the work and cooperate to ensure the smooth operation of the production line. In the traditional sphere manufacturing process, energy is consumed in each link, such as material heating, molding equipment operation, and inflation equipment energy consumption. Long-term, large-scale production will lead to a large amount of energy consumption, which is not conducive to energy conservation and environmental protection.

[0007] Furthermore, existing match and training balls are generally not coated with other materials. While this design simplifies the structure of the ball, it also affects its performance to some extent. For example, the lack of an outer protective layer makes the ball more susceptible to damage from the external environment, such as ultraviolet rays and moisture, which accelerates the aging process. Summary of the Invention

[0008] To address these issues, the present invention provides a highly elastic and resilient ball structure. This structure utilizes a supercritical foaming process to create a foamed core and a surfaced surface, leveraging the unique properties of the supercritical process to impart exceptional elasticity and resilience to the ball. Compared to traditional inflatable balls, this design allows the ball to return to its original shape more quickly after impact, significantly improving user experience and ensuring consistent roundness.

[0009] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a ball structure with high elasticity and high recovery, including a foamed ball core, wherein a reinforcement layer is provided on the periphery of the foamed ball core, and a plurality of patch spherical surfaces are bonded to the periphery of the reinforcement layer; the foamed ball core and / or the patch spherical surfaces are prepared by a supercritical foaming process.

[0010] As a further optimization solution, the foam core is at least one of a polyurethane foam core, an EVA foam core, a TPE foam core, an SBR foam core, an NBR foam core, an EPDM foam core, an SBL foam core, a POE foam core, a PE foam core, a TPR foam core, a TPU foam core, and a TPEE foam core.

[0011] As a further optimization solution, the diameter of the foamed sphere core is 8cm-25cm.

[0012] As a further optimization solution, the reinforcement layer is a non-woven fabric or a woven fabric, and the non-woven fabric or the woven fabric is hot-pressed or glued to the periphery of the foamed ball core.

[0013] As a further optimization solution, the reinforcement layer is a winding layer, and the winding layer is bonded to the periphery of the foamed ball core by glue or latex.

[0014] As a further optimization solution, the winding layer is formed by winding at least one of polyester-cotton yarn, pure cotton yarn, polyester yarn, and nylon yarn.

[0015] As a further optimization solution, the patch spherical surface includes a foamed spherical surface layer and a film layer laminated in sequence, wherein the foamed spherical surface layer is laminated to the surface of the reinforcement layer, wherein the thickness of the foamed spherical surface layer is 1mm-20mm, and the thickness of the film layer is 0.1mm-5mm.

[0016] As a further optimization solution, the foamed spherical surface layer is made of at least one material selected from polyurethane, EVA, TPE, SBR, NBR, EPDM, SBL, POE, PE, TPR, TPU, and TPEE and is prepared by a supercritical foaming process.

[0017] As a further optimization solution, the inner layer or the outer layer of the film layer is provided with a printing layer by spray painting, printing, heat transfer printing, water transfer printing, cold transfer printing or pad printing.

[0018] As a further optimization solution, the surface of the foamed spherical surface layer is further provided with grooves.

[0019] The beneficial effects of the present invention are:

[0020] 1. The supercritical foaming process is used to create the foam core and surface, creating a unique, irregular, fine, and porous structure that imparts exceptional elasticity and resilience to the sphere. Compared to traditional inflatable spheres, the supercritical foaming process allows the sphere to maintain excellent elasticity, resilience, and roundness even after extended use.

[0021] 2. This solution incorporates a reinforcement layer around the foam core. This design not only enhances the overall stability of the sphere but also allows it to better disperse and resist impact forces when subjected to external forces, ensuring consistent roundness throughout use and effectively extending its service life. The reinforcement layer also reduces performance degradation due to impact, further improving the consistency of the sphere's roundness.

[0022] 3. Several patch spheres are bonded to the outer periphery of the reinforcement layer. These patch spheres consist of a foamed surface layer and a film layer. The film layer is made from a variety of high-performance materials, such as polyurethane, TPU, and PVC, offering excellent flexibility, protection, and chemical and abrasion resistance. This design not only protects the foamed surface from environmental damage but also imparts enhanced waterproof, dustproof, and anti-fouling properties to the sphere, ensuring stable performance in harsh operating environments. It also ensures the surface remains clean and aesthetically pleasing even after prolonged use.

[0023] 4. The solution of this application uses a supercritical foaming process to prepare the foamed sphere core and the patch sphere surface. This process greatly simplifies the process compared to the traditional inflatable sphere manufacturing process. The supercritical foaming process can complete the foaming and molding of the material in a relatively short time, without the need for complex inflation and deflation testing, thereby significantly improving production efficiency while also reducing energy consumption and waste. Moreover, the simplification of the manufacturing process and the shortening of manufacturing time directly lead to a reduction in the number of staff required. The more automated supercritical foaming process can reduce dependence on manual operation, thereby reducing labor costs and improving the stability and reliability of the production line.

[0024] 5. The spheres prepared by the present application scheme are fixed (quantitative data), which means that the size, shape, performance and other parameters of the spheres can be precisely controlled, which is more in line with the requirements of the automated process, making the entire production process smoother and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional structural diagram of the spherical structure.

[0026] Figure 2 Schematic diagram of an embodiment using one of the patch spherical surfaces.

[0027] Figure 3 It is a schematic diagram of an embodiment using another patch spherical surface.

[0028] Figure 4 This is a schematic diagram showing a ball structure that is a rugby ball structure.

[0029] Figure 5 It is a structural diagram of a high-precision rebound tester.

[0030] Figure 6 It is a structural diagram of a roundness measuring instrument.

[0031] Explanation of the accompanying figures: 1. Foamed core; 2. Reinforcement layer; 3. Patched spherical surface; 3A, foamed spherical surface layer; 3B, film layer. DETAILED DESCRIPTION

[0032] See also Figure 1 As shown, the present invention relates to a ball structure with high elasticity and high recovery, including a foamed ball core 1, wherein a reinforcement layer 2 is provided on the periphery of the foamed ball core 1, and a plurality of patch spherical surfaces 3 are bonded to the periphery of the reinforcement layer 2; wherein the foamed ball core 1 and / or the patch spherical surfaces 3 are both prepared by a supercritical foaming process.

[0033] The foaming core 1, as the internal core component of the ball structure, is prepared by a supercritical foaming process. During the foaming process, this process precisely controls the temperature and pressure conditions to form countless irregular, fine, and multi-cellular structures inside the material. These cellular structures give it excellent elastic properties, allowing the core to quickly return to its original form after being impacted by external forces, providing excellent user experience and effects. It is worth noting that although the name of the foaming core 1 contains the word "core", it is actually not limited to the traditional spherical structure. According to specific design requirements and application scenarios, the foaming core 1 can be designed into various irregular shapes to adapt to different ball sports and performance requirements. This flexibility allows the core to better match the external structure, ensuring the stability and consistency of the entire sphere.

[0034] Moreover, in this embodiment, the aforementioned foaming core 1 is an EVA foaming core 1, a TPE foaming core 1, an SBR foaming core 1, an NBR foaming core 1, an EPDM foaming core 1, an SBL foaming core 1, a POE foaming core 1, a PE foaming core 1 or a TPR foaming core 1, a TPU foaming core 1, a TPEE foaming core 1, or a polyurethane foaming core 1.

[0035] The following are some of the characteristics of different materials:

[0036] TPU (thermoplastic polyurethane elastomer) has the following characteristics: wear resistance, oil resistance, low temperature resistance, excellent rebound performance and strong durability.

[0037] TPEE (thermoplastic polyester elastomer) can be considered an upgraded version of TPU. Its performance in terms of rebound and durability is similar to TPU, but it offers significant improvements in lightweighting. It is suitable for the production of sports balls with high requirements for lightweighting.

[0038] EVA (ethylene-vinyl acetate copolymer) has the following characteristics: Although its durability is relatively ordinary, the foamed EVA material has excellent elasticity and flexibility. Traditional foam shoe materials are also suitable for the production of sports balls with certain cost requirements.

[0039] In this specific embodiment, polyurethane / TPU / TPEE are preferably used for supercritical foaming process.

[0040] Further discussion, the reinforcing layer 2 is a non-woven fabric or a woven fabric, which is heat-pressed or glued to the periphery of the foam core 1. The woven fabric is made of 20, 30 or 40 yarns.

[0041] In this specific embodiment, a reinforcement layer 2 is provided around the outer periphery of the foam core 1. This design not only enhances the overall stability of the sphere but also allows the sphere to better disperse and resist impact forces when subjected to external forces, thereby effectively extending the sphere's service life and ensuring consistency during use. Furthermore, the use of the reinforcement layer 2 reduces performance degradation caused by impact and further improves the consistency of the sphere's roundness.

[0042] In another embodiment, the reinforcing layer 2 can be a winding layer, which is provided with adhesive or latex, and the patch spherical surface 3 is adhesively bonded to the winding layer via the adhesive or latex. In a further limited technical solution of the present invention, the winding layer is wound with polyester-cotton yarn, pure cotton yarn, polyester yarn, or nylon yarn.

[0043] Detailed Analysis: The winding layer is made of yarn wound around the foam core 1, forming a tight and solid structure. This structure not only enhances the overall stability of the sphere but also effectively disperses and resists impact forces when subjected to external forces, thereby extending the lifespan of the sphere. The materials used in the winding layer, such as polyester-cotton yarn, pure cotton yarn, polyester yarn, or nylon yarn, offer high strength and protective properties. These materials ensure the winding layer's excellent durability, maintaining stable performance even under prolonged use and frequent friction. The winding layer is coated with adhesive or latex, which securely adheres the patch surface 3 to the winding layer. This adhesive bonding method not only strengthens the bond between the patch surface 3 and the reinforcement layer 2 but also helps maintain the overall structural integrity of the sphere under external forces. Furthermore, the winding layer and reinforcement layer 2 offer considerable flexibility, adapting to different material combinations. For example, yarns of varying materials and specifications can be used to create the winding layer to meet the performance requirements of different sports and athletes.

[0044] To further discuss, in this specific embodiment, a single patch spherical surface 3 comprises a foamed spherical surface layer 3A and a film layer 3B connected in sequence; wherein the foamed spherical surface layer 3A is bonded to the surface of the reinforcement layer 2. Moreover, the foamed spherical surface layer 3A is prepared by a supercritical foaming process.

[0045] Detailed Analysis: The foamed spherical surface layer 3A is produced through a supercritical foaming process. This process utilizes the unique properties of supercritical gases (such as carbon dioxide or nitrogen) under specific temperatures and pressures to form an irregular, fine, multi-cellular structure during the foaming process. This structure imparts excellent elasticity, lightweightness, and protective properties to the foamed spherical surface layer 3A. In this specific embodiment, the foamed spherical surface layer 3A can be produced from a variety of materials, such as at least one of EVA, TPE, SBR, NBR, EPDM, SBL, POE, PE, and TPR. Each of these materials has its own unique characteristics and can be selected based on the desired use and performance requirements of the sphere. For example, materials such as polyurethane and TPU offer excellent elasticity, resilience, and low-temperature impact strength, making them suitable for the production of high-end sports balls. Simultaneously, the foamed spherical surface layer 3A is tightly bonded to the surface of the reinforcement layer 2, forming the outer layer structure of the sphere. This bonding not only enhances the structural stability of the sphere but also enables the sphere to better disperse and resist impact forces when subjected to external forces.

[0046] In addition, the film layer 3B can be made of materials such as TPU, PVC, PU, ​​TPE, TPR, PET, and EVA. These materials have good flexibility, protectiveness, and chemical resistance, and can protect the foamed spherical surface layer 3A from damage by the external environment. The film layer 3B not only improves the durability of the sphere, but also gives the sphere better waterproof, dustproof, and anti-fouling properties. This allows the sphere to maintain stable performance in humid or harsh operating environments. At the same time, the film layer 3B, as the outer layer of the patch spherical surface 3, can be made into a printed layer on the surface of the film layer 3B through spray painting, printing, thermal transfer, water transfer, cold transfer, and pad printing. This printed layer can carry a variety of visual elements, such as patterns, logos, brand logos, etc., thereby enhancing the aesthetics and personalization of the sphere.

[0047] See Figure 2-3 Moreover, a single patch spherical surface 3 can be designed to be a regular hexagon, regular pentagon, or other polygonal or irregular shape. By selecting a plurality of appropriate patch spherical surfaces 3 and attaching them to the reinforcement layer 2, a tight spherical surface is formed, i.e., a sphere with different patterns is formed. This design not only improves the aesthetics of the sphere, but also enhances the structural stability and durability of the sphere. At the same time, the shape of the patch spherical surface can also be customized according to customer needs (see Figure 2-3 ) to meet personalized needs.

[0048] The following is the specific production process:

[0049] Step 1, material preparation:

[0050] Foam core 1, material: TPU foam material, using supercritical foaming process to ensure that the foam core 1 has high elasticity, low temperature resistance and excellent elasticity and recovery.

[0051] Reinforcement layer 2: winding layer, material: polyester-cotton yarn, diameter: 1 mm, winding method: spiral winding, using adhesive as an adhesive to tightly combine the winding layer and the foaming core 1.

[0052] Foamed spherical surface layer 3A: Material: TPU foam material; Thickness: 3mm; Size: Matches the reinforcement layer 2 to ensure complete coverage. The supercritical foaming process is used to give the patch spherical surface 3 a lightweight and good elasticity.

[0053] Film layer 3B: Material: TPU film; Thickness: 0.1mm; Size: Slightly larger than the foamed spherical layer 3A, with a 2mm margin reserved at the edge for bonding.

[0054] Printing layer: Print patterns, logos or brand logos in the film layer 3B using heat transfer technology.

[0055] Step 2, preparing the foamed core 1: placing the TPU material into a supercritical foaming device, foaming it according to the existing supercritical foaming process parameters (since the supercritical foaming process is a process of the prior art, its process parameters and process flow will not be discussed here in detail, and you can refer to CN20241103A408.5 or CN202410925729.3, etc.) to prepare the foamed core 1.

[0056] Step 3: Using the winding layer as the reinforcement layer 2, the polyester-cotton yarn is wound around the outer periphery of the foamed core 1 according to the above-mentioned winding process parameters, and latex is used as an adhesive to fix it.

[0057] Step 4: Place the TPU material in a supercritical foaming machine and foam it according to conventional supercritical foaming process parameters to prepare a foamed spherical surface layer 3A. Cut the TPU film into a size slightly larger than the foamed spherical surface layer 3A, leaving a 2mm margin. The film layer 3B is tightly bonded to the foamed spherical surface layer 3A through a hot pressing process to form the final patch spherical surface 3.

[0058] Step 5: Hot-press the patch spherical surface 3 and the winding layer (hot-pressing temperature: 150°C, hot-pressing pressure: 5 MPa, hot-pressing time: 30 seconds, cooling time: 10 seconds) to ensure a close fit, thereby forming a complete ball structure.

[0059] Step 6, forming grooves on the surface of the foamed spherical surface layer 3A by hot pressing or other means. The outermost surface of the foamed spherical surface layer 3A can be provided with grooves according to actual needs. These grooves are exquisitely designed and have multiple functions: on the one hand, they can significantly reduce the friction of the ball during rolling or movement, making the ball smoother and improving sports performance; on the other hand, the grooves also serve to facilitate drainage, especially in humid or rainy environments, and can effectively prevent water accumulation from affecting the controllability and performance of the ball. In addition, the presence of the grooves also increases the grip of the ball, improving the stability and accuracy of the user in actions such as catching the ball and passing the ball. Therefore, the groove design on the surface of the foamed spherical surface layer 3A not only improves the practicality of the ball, but also brings a more excellent experience to ball sports.

[0060] Sphere consistency performance test:

[0061] 1. Experimental Purpose

[0062] This experiment aimed to compare and contrast spheres using a reinforcement layer and supercritical foaming technology (experimental group) with traditional inflatable spheres (control group) to determine the consistency of their roundness after certain use (such as impact and compression). By measuring and comparing the change in roundness before and after use, the performance of the two spheres in maintaining shape stability was evaluated.

[0063] 2. Experimental Materials

[0064] Experimental group samples: 3 spheres using traditional skeleton structure and supercritical patch technology, with a diameter of about 15 cm, numbered A1, A2, and A3.

[0065] Control group samples: 3 traditional inflatable balls, about 15 cm in diameter, numbered B1, B2, and B3.

[0066] 3. Test equipment and tools

[0067] Durability tester (can simulate the impact, extrusion, etc. of the ball in actual use) and roundness measuring instrument (see Figure 6 , accuracy 0.01mm)

[0068] IV. Experimental Procedure

[0069] Preprocessing and initial measurements:

[0070] All spheres are placed at room temperature for 24 hours to eliminate the impact of temperature differences on the experimental results. Use a roundness meter to select multiple evenly distributed points on each sphere for measurement, and record the initial roundness data of each point (i.e., the distance from the surface of the sphere to the center of the sphere). Use simulation test: The spheres of the experimental group and the control group are placed in a durability testing machine respectively, and the impact frequency, force and test time are set to simulate the impact, squeezing and other conditions of the spheres in actual use. The test time can be set according to standard requirements, such as 4 hours, to ensure that the spheres have undergone sufficient use simulation. Post-use measurement: After the test is completed, all spheres are taken out and measured again using the roundness meter at the same measurement point on each sphere, and the roundness data after use is recorded. Data recording and analysis: Calculate the change in roundness of each sphere before and after use (i.e., the difference between the roundness data after use and the initial roundness). Analyze and compare the performance differences between the experimental group and the control group in maintaining roundness consistency.

[0071] 5. Experimental data output

[0072] Initial roundness data (unit: mm):

[0073]

[0074] Roundness data after use:

[0075]

[0076]

[0077] Based on the experimental data, it can be concluded that the spheres using a traditional skeleton structure and supercritical bonding technology (experimental group) maintained a more consistent roundness than the traditional inflatable spheres (control group) after simulated use. The experimental group's spheres showed less variation in roundness, indicating they were better able to maintain shape stability under impact, compression, and other conditions. This demonstrates the effectiveness of supercritical bonding technology in maintaining consistent roundness in spheres.

[0078] Rebound force test experiment:

[0079] 1. Experimental Purpose

[0080] The purpose of this experiment is to verify whether the ball structure prepared by supercritical process (hereinafter referred to as "experimental ball") is better than the basketball or football of the same size on the market (hereinafter referred to as "control ball") in terms of rebound force.

[0081] 2. Experimental Materials and Equipment

[0082] 2.1 Experimental Materials

[0083] Experimental group: The supercritical process ball structure prepared using Example 1 has a diameter of 20.5 cm, the foam core 2 is made of TPU foam material, the spherical patch layer 4 is also made of TPU foam material, the reinforcement layer 3 is a polyester-cotton yarn winding layer, and the film layer 5 is a TPU film.

[0084] Control group: Inflatable soccer balls of the same size (20.5 cm) randomly selected from the market, made of polyvinyl chloride (PVC) or other rubber, plastic, or rubber-plastic copolymer materials.

[0085] 2.2 Experimental equipment

[0086] See Figure 5 , High-precision rebound tester: used to accurately measure the rebound height of the ball.

[0087] 3. Experimental steps

[0088] Preparation stage:

[0089] Make sure both the experimental and control products are in new, unused condition.

[0090] Using a height measuring tape, mark a height of 2.00 m at the release point of each sphere.

[0091] Testing phase:

[0092] For each sphere, release it from the marked release point and let it fall freely and rebound.

[0093] Use a rebound tester to measure the rebound height of the ball when it rebounds to its highest point.

[0094] Repeat this process 10 times to obtain stable experimental data.

[0095] Data recording and processing:

[0096] The rebound height of each test was recorded, and the average rebound height and rebound rate (average rebound height / release height×100%) were calculated. The data were statistically analyzed to verify whether the difference between the two groups of data was significant.

[0097] 4. Experimental Data

[0098]

[0099]

[0100]

[0101] 5. Data Analysis

[0102] It can be seen from the bounce test reports of the experimental group and the control group that the average rebound height of the experimental ball is 1305MM, and the average rebound rate is 65.25%; while the average rebound height of the control ball is 1179MM, and the average rebound rate is 58.95%. It can be verified that the rebound force of the experimental ball is significantly better than that of the control group ball.

[0103] VI. Conclusion

[0104] This experiment verified through comparative testing that the ball structure produced using the supercritical process significantly outperformed common soccer balls in terms of rebound force. The experimental data showed that the average rebound rate and rebound height of the experimental ball were significantly higher than those of the control ball.

[0105] View Figure 4 Another set of experiments: Rugby ball consistency retention test

[0106] 1. Experimental Purpose

[0107] This experiment aimed to test the ability of a rugby ball (experimental group) made with supercritical foaming technology to maintain its external shape (i.e., spherical consistency) after being subjected to normal forces such as impact and extrusion. This ensured that after being subjected to external forces, the ball would not have obvious bulges or depressions on its surface compared to the control group (traditional rugby ball), maintaining a good spherical shape consistency.

[0108] 2. Experimental Materials

[0109] The experimental group samples included three rugby balls made using supercritical foaming technology (rugby balls prepared using the process of Specific Example 1), with diameters and shapes meeting rugby standards, numbered A1, A2, and A3.

[0110] Control group samples: 3 rugby balls made with traditional craftsmanship, with the same diameter and shape as the experimental group, numbered B1, B2, and B3.

[0111] Test equipment:

[0112] Impact testing machine: can simulate the impact force and frequency that a football receives in an actual game.

[0113] Extrusion testing machine: used to simulate the stress conditions of a football when it is squeezed.

[0114] Roundness Meter: A high-precision measuring instrument used to measure the roundness and surface morphology of a football before and after use.

[0115] 3. Experimental steps

[0116] Pretreatment: All footballs were placed at room temperature for 24 hours to eliminate the effects of temperature differences on the experimental results. An initial roundness measurement was performed on each football using a roundness measuring instrument, and its initial roundness and surface morphology data were recorded.

[0117] Impact Test: The experimental and control footballs were placed in an impact testing machine, with the impact force and frequency set to match the actual conditions of a football game. A certain number of impact tests were performed to ensure that each football received sufficient impact.

[0118] Squeeze Test: After impact testing, the ball is placed in a squeeze tester to simulate the forces exerted on the ball. A certain number of squeeze tests are performed, and the force and duration of each squeeze are recorded.

[0119] Post-use measurements: Each ball is measured after use using a roundness meter, focusing on changes in roundness and surface morphology. Each ball's measurement is recorded and compared to the initial reading.

[0120] Data Analysis: The change in roundness and surface morphology of each football before and after use was calculated.

[0121] The data of the experimental group and the control group were statistically analyzed to compare the differences between the two groups in terms of ball consistency.

[0122] 4. Experimental data output

[0123]

[0124] 5. Experimental Conclusion

[0125] Based on the above experimental data, it can be concluded that the rugby balls made with supercritical foaming technology (experimental group) are significantly better at maintaining their external shape (spherical consistency) after normal impact, extrusion and other forces than rugby balls made with traditional technology (control group). The roundness of the rugby balls in the experimental group changed little, and there were no obvious bumps or depressions in the surface morphology, indicating that they were able to maintain the consistency of the spherical shape well after being subjected to external forces. The rugby balls in the control group, on the other hand, showed varying degrees of changes in roundness and surface morphology, indicating that they were not good at maintaining spherical consistency. Therefore, rugby balls made with supercritical patch technology have significant advantages in improving spherical consistency and durability.

[0126] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A ball structure with high elasticity and high recovery, characterized in that: It comprises a foamed spherical core, wherein a reinforcing layer is arranged on the periphery of the foamed spherical core, and a plurality of patch spherical surfaces are bonded to the periphery of the reinforcing layer; the foamed spherical core and / or the patch spherical surfaces are prepared by supercritical foaming process.

2. A ball structure with high elasticity and high recovery according to claim 1, characterized in that: The foam core is at least one of a polyurethane foam core, an EVA foam core, a TPE foam core, an SBR foam core, an NBR foam core, an EPDM foam core, an SBL foam core, a POE foam core, a PE foam core, a TPR foam core, a TPU foam core, and a TPEE foam core.

3. The ball structure with high elasticity and high recovery according to claim 1, characterized in that: The diameter of the foamed spherical core is 8cm-25cm.

4. The ball structure with high elasticity and high recovery according to claim 1, characterized in that: The reinforcing layer is a non-woven fabric or a woven fabric, and the non-woven fabric or the woven fabric is attached to the periphery of the foamed ball core by heat pressing or gluing.

5. The ball structure with high elasticity and high recovery according to claim 1, characterized in that: The reinforcing layer is a winding layer, and the winding layer is bonded to the periphery of the foamed ball core by adhesive.

6. A ball structure with high elasticity and high recovery according to claim 5, characterized in that: The winding layer is formed by winding at least one of polyester-cotton yarn, pure cotton yarn, polyester yarn and nylon yarn.

7. The ball structure with high elasticity and high recovery according to claim 1, characterized in that: The patch spherical surface comprises a foamed spherical surface layer and a film layer which are laminated in sequence, wherein the foamed spherical surface layer is laminated on the surface of the reinforcement layer, wherein the thickness of the foamed spherical surface layer is 1mm-20mm, and the thickness of the film layer is 0.1mm-5mm.

8. The ball structure with high elasticity and high recovery according to claim 7, characterized in that: The foamed spherical surface layer is made of at least one material selected from the group consisting of polyurethane, EVA, TPE, SBR, NBR, EPDM, SBL, POE, PE, TPR, TPU, and TPEE and is prepared through a supercritical foaming process.

9. A ball structure with high elasticity and high recovery according to claim 8, characterized in that: The inner layer or the outer layer of the film layer is provided with a printing layer by spray painting, printing, heat transfer, water transfer, cold transfer or pad printing.

10. A ball structure with high elasticity and high recovery according to claim 9, characterized in that: The surface of the foamed spherical surface layer is also provided with grooves.

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