Hollow sphere structure based on supercritical process

Abstract

The invention relates to the field of sports goods, in particular to a hollow sphere structure based on a supercritical process, which comprises a foaming sphere center, a plurality of hollow cavities formed inside / outside the foaming sphere center and inside / outside the foaming sphere center, a reinforcing layer is arranged on the periphery of the foaming sphere center, a spherical patch layer is attached to the periphery of the foaming sphere center, and the foaming sphere center or / and the spherical patch layer 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 invention relates to the field of sports goods, in particular to a hollow ball structure based on a supercritical process. Background Art

[0002] In the prior art, bouncy balls or related spheres in the field of sporting goods are mostly designed as structures that need to be inflated. Although this design meets the use requirements of the sphere to a certain extent, it has some inherent deficiencies. First, the inflatable sphere needs to check the air pressure and replenish the gas, which requires additional inflation equipment, which will relatively increase the inconvenience of the user and also increase the additional cost; secondly, the elastic performance of the inflatable sphere is often limited by the gas pressure and the choice of the sphere material. Many spheres cannot quickly return to their original shape after being impacted by external forces, and their elasticity and recovery are insufficient, which makes it impossible for the sphere to ensure the consistency of its roundness during use.

[0003] At the same time, the manufacturing process of traditional spheres usually includes multiple complex steps, such as material preparation, molding, inflation, sealing, testing, etc. Each step requires precise control, and the processes are closely connected. Once a link goes wrong, it may be necessary to start over, resulting in low overall production efficiency.

[0004] For example, the inflation process and 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 cumbersome 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, operation of molding equipment, energy consumption of inflation equipment, etc. Long-term and large-scale production will lead to a large amount of energy consumption, which is not conducive to energy conservation and environmental protection.

[0005] Specifically, the common sports balls on the market, such as basketballs and footballs, are mainly made of polyurethane (PU), polyvinyl chloride (PVC) or other rubber or rubber-plastic copolymer materials. These materials are limited by the traditional inflatable ball process during the preparation process, which makes the inflatable balls have deficiencies in elasticity, wear resistance, aging resistance, etc. When impacted by external forces, these inflatable balls often cannot quickly return to their original shape, affecting the use effect and experience. In addition, due to the presence of gas inside the inflatable ball, once the ball is pierced by sharp objects such as shoe spikes or is subjected to excessive pressure, it may cause the gas to gradually leak, causing the ball to lose its functionality. This design not only increases the risk of use, but also limits the application of the ball in certain special environments.

[0006] Therefore, the sports balls in the prior art have deficiencies in terms of elasticity and recovery, service life, and ease of maintenance, and a new structure and material are needed to improve and enhance them. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a hollow ball structure based on supercritical technology. By adopting supercritical foaming technology to prepare the foamed ball core and the spherical surface patch layer, the ball can be more quickly restored to its original shape after being impacted by external force. Moreover, the ball is a hollow structure and does not need to be inflated, thus avoiding the cumbersome process of checking the air pressure and replenishing the gas required for traditional inflatable balls. This improvement not only improves the convenience of users, but also avoids the increase in overall costs caused by the need to inflate and maintain the inflatable ball, and also avoids the situation where the game is stopped due to the need for inflation.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a hollow sphere structure based on supercritical process, including a foaming core, a plurality of hollow cavities formed inside or on the surface of the foaming core, or inside and on the surface, a reinforcement layer is arranged on the periphery of the foaming core, and a spherical patch layer is bonded to the periphery of the reinforcement layer, and the foaming core and / or the spherical patch layer are prepared by supercritical foaming process.

[0009] As a further optimization scheme, the foaming core is at least one of a polyurethane foaming core, an EVA foaming core, a TPE foaming core, an SBR foaming core, an NBR foaming core, an EPDM foaming core, an SBL foaming core, a POE foaming core, a PE foaming core, a TPR foaming core, a TPU foaming core, and a TPEE foaming core.

[0010] As a further optimization solution, a thin film layer is bonded to the outer surface of the spherical patch layer.

[0011] As a further optimization solution, the foamed sphere core is foamed in one piece through a supercritical foaming process.

[0012] As a further optimization solution, the foamed ball core is composed of a plurality of spliced ​​bodies.

[0013] 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 / glued to the periphery of the foamed sphere core.

[0014] 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 gluing.

[0015] As a further optimization solution, the spherical patch layer is made of at least one of polyurethane, EVA, TPE, SBR, NBR, EPDM, SBL, POE, PE, TPR, TPU, and TPEE materials and is foamed through a supercritical process.

[0016] As a further optimization scheme, the thickness of the spherical patch layer is 1mm-20mm, the thickness of the film layer is 0.1mm-3mm, and the film layer is made of at least one material selected from polyurethane, EVA, TPE, SBR, NBR, EPDM, SBL, POE, PE, TPR, TPU, and TPEE.

[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, water transfer, cold transfer or pad printing.

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

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

[0020] 1. The foamed core and spherical surface layer are prepared by supercritical foaming process, which enables the sphere to recover to its original shape more quickly after being impacted by external force. This improvement significantly improves the use experience and effect of the sphere, and meets the athletes' requirements for high elasticity and high reaction speed of the sphere in a continuous collision environment.

[0021] 2. The design of the reinforcement layer and the spherical patch layer enhances the structural stability, wear resistance and aesthetics of the sphere. The material prepared by the supercritical foaming process also has high durability and aging resistance, which prolongs the service life of the sphere and reduces the frequency of replacement and use cost of the sphere.

[0022] 3. Since the sphere of the present invention is a hollow structure and does not need to be inflated, the cumbersome process of checking air pressure and replenishing gas required for traditional inflatable spheres is avoided. This improvement not only improves the convenience of the user, but also reduces the risk of sphere damage caused by improper maintenance. In addition, the supercritical process hollow sphere structure is also suitable for a variety of sports scenes and athlete needs, such as basketball, football, volleyball, etc., and has broad application prospects.

[0023] 4. The outermost surface of the spherical patch layer can be provided with grooves according to actual needs. These grooves are ingeniously designed and have multiple functions: on the one hand, they can significantly reduce the friction between the ball and the ground or air during its rotation on the ground and in the air, making the ball smoother and improving the excellent performance of the ball's motion trajectory; on the other hand, the grooves also facilitate drainage, especially in humid or rainy environments, which can effectively prevent water accumulation from affecting the controllability and trajectory 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 and passing the ball. The groove design on the surface of the spherical patch not only improves the practicality of the ball, but also brings a more excellent experience to ball sports.

[0024] 5. The solution of the present application adopts a supercritical foaming process to prepare the foamed ball core and the spherical patch layer. This process greatly simplifies the process compared to the manufacturing process of traditional inflatable balls. 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 tests, thereby significantly improving production efficiency while also reducing energy consumption and waste. Moreover, the simplification of the manufacturing process and the shortening of the manufacturing time directly lead to a reduction in the number of staff required. The supercritical foaming process with a higher degree of automation can reduce dependence on manual operation, thereby reducing labor costs and improving the stability and reliability of the production line.

[0025] 6. 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

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of the ball structure of Example 1.

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the ball structure of Example 2.

[0028] Figure 3 It is a schematic diagram of the cross-sectional structure of the ball structure of Example 3.

[0029] Figure 4 It is a schematic diagram of the cross-sectional structure of the ball structure of Example 4.

[0030] Figure 5 It is a schematic diagram of the cross-sectional structure of the ball structure of Example 5.

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of the ball structure of Example 6.

[0032] Figure 7 This is a SEM image of the foamed sphere core obtained in Example 1 observed by a scanning electron microscope (SEM).

[0033] Figure 8 It is a test equipment for rebound test.

[0034] Fig. 9 It is a schematic diagram of the structure of a roundness measuring instrument.

[0035] Explanation of the accompanying drawings: 1. Hollow cavity; 2. Foamed ball core; 211. Spliced ​​body; 3. Reinforcement layer; 4. Spherical patch layer; 5. Film layer. DETAILED DESCRIPTION

[0036] See also Figure 1 As shown, Example 1:

[0037] In this specific embodiment, two bowl-shaped splicing bodies 211 are used, and after splicing, the hollow cavity 1 is located inside the foaming core 2, that is, located at the center of the foaming core 2; the two can be connected by bonding / hot melting. Overall, the split design divides the foaming core 2 into multiple splicing bodies 211, and each splicing body 211 can be molded separately. Compared with one-piece molding, this split molding method is easier to control various parameters in the molding process, such as temperature, pressure, time, etc., thereby reducing the difficulty of molding. The split design makes the demoulding and removal process simpler. Since each splicing body 211 can be demoulded and removed separately, the problem of demoulding difficulty or damage to the removal caused by one-piece molding is avoided.

[0038] Further discussion, the reinforcing layer 3 is a non-woven fabric or a woven fabric, which is hot pressed / glued to the periphery of the foamed core 2. The woven fabric can be selected from a fabric with 20, 30 or 40 yarns.

[0039] In this specific embodiment, the reinforcement layer 3 is hot-pressed / glued to the periphery of the foam core 2 by non-woven fabric or woven fabric, providing better support and stability for the foam core 2. This structural reinforcement enables the sphere to better maintain its shape and integrity when impacted by external forces, thereby extending the service life of the sphere. The presence of the reinforcement layer 3 makes the foam core 2 more durable, reducing the performance degradation caused by continuous impacts.

[0040] As another embodiment, the reinforcing layer 3 can be selected as a winding layer, the winding layer is provided with adhesive or latex, and the spherical patch layer 4 is bonded to the winding layer by 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.

[0041] Specific analysis: The winding layer is made of yarn, which can form a tight and solid structure around the foamed ball core 2. This structure not only enhances the overall stability of the sphere, but also enables the sphere to better disperse and resist impact when subjected to external force, thereby extending the service life of the sphere. The materials used in the winding layer, such as polyester-cotton yarn, pure cotton yarn, polyester yarn or nylon yarn, have high strength. The selection of these materials makes the winding layer itself have excellent durability and can maintain stable performance during long-term use and frequent continuous impacts.

[0042] The winding layer is provided with adhesive or latex, and these adhesives can firmly stick the spherical patch layer 4 to the winding layer. This adhesive bonding method not only improves the bonding force between the spherical patch layer 4 and the reinforcement layer 3, but also enables the sphere to better maintain the integrity of the overall structure when subjected to external forces. Moreover, the method of winding the reinforcement layer 3 has greater flexibility and can meet the needs of different material combinations. For example, yarns of different materials and specifications can be selected to make the winding layer to meet the requirements of different sports scenes and athletes for the performance of the sphere.

[0043] Specific analysis: The spherical patch layer 4 is prepared by supercritical foaming process. This process uses the special properties of supercritical foaming process (such as carbon dioxide or nitrogen) at specific temperature and pressure to make the material form an irregular fine multi-cell structure during the foaming process (see Figure 7 , is a SEM image of the foamed ball core 2 obtained in Example 1 observed by a scanning electron microscope (SEM). This structure gives the spherical patch layer 4 excellent elasticity, lightness and wear resistance. In this specific embodiment, the spherical patch layer 4 can be prepared from a variety of materials, such as at least one of EVA, TPE, SBR, NBR, EPDM, SBL, POE, PE, TPR, etc. These materials have their own characteristics and can be selected according to the use requirements and performance requirements of the sphere. For example, materials such as polyurethane and TPU have excellent elasticity, resilience and low-temperature impact strength, and are suitable for making high-end sports balls. At the same time, the spherical patch layer 4 is tightly fitted with the surface of the reinforcement layer 3 to form the outer layer structure of the sphere. This bonding method not only enhances the structural stability of the sphere, but also enables the sphere to better disperse and resist impact when subjected to external forces.

[0044] Moreover, the spherical patch layer 4 can be made of multiple pieces bonded to the periphery of the foamed ball core 2. The design of multiple pieces bonding can make the production process more flexible. Each spherical patch layer 4 can be produced independently and then assembled together, which helps to achieve parallel production, thereby improving overall production efficiency. At the same time, since the spherical patch layer 4 can be produced separately, it is easier to achieve large-scale production and reduce the cost of each piece. Moreover, this design also reduces material waste and further reduces costs.

[0045] In addition, the film layer 5 can be made of materials such as TPU, PVC, PU, ​​TPE, TPR, PET, EVA, etc. These materials have good flexibility, wear resistance and chemical corrosion resistance, and can protect the foamed spherical surface layer 31 from damage by the external environment. The film layer 5 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 a humid or harsh use environment. At the same time, the film layer 5, as the outer layer of the spherical patch layer 4, can be made into a printed layer on the surface of the film layer 5 by spray painting, printing, thermal transfer, water transfer, cold transfer and pad printing, etc. The printed layer can carry rich visual elements, such as patterns, logos, brand logos, etc., thereby enhancing the aesthetics and personalization of the sphere.

[0046] Specific production process of supercritical hollow ball structure:

[0047] Step 1, material preparation: Foam core 2 material: select TPU, reinforcement layer 3 material: select polyester-cotton yarn as winding layer material. Film layer 5 material: select TPU film.

[0048] Step 2, preparation of splicing body 211: Divide the polyurethane material into two parts and put them into two molds of supercritical foaming equipment respectively. Set the temperature of the supercritical foaming equipment to 120°C, the pressure to 25MPa, and the foaming time to 30 minutes. According to the set 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 CN202411031408.5 or CN202410925729.3, etc.), supercritical foaming treatment is carried out to obtain two hollow foamed hemispherical bodies with irregular small multi-cellular structures. After the foaming is completed, take out the hollow foamed hemispherical body and carry out necessary cooling and shaping treatment.

[0049] Step 3, bonding the spliced ​​bodies 211: Use a suitable adhesive (such as hot melt adhesive, polyurethane adhesive, etc.) to bond the two spliced ​​bodies 211 together to form a complete foamed ball core 2. Ensure that the bonding area is flat and firm.

[0050] Step 4, making and bonding the reinforcing layer 3: using polyester-cotton yarn as the winding layer material, winding is performed according to the preset winding method and parameters. Using latex as an adhesive, the winding layer is closely bonded to the periphery of the foamed ball core 2.

[0051] Step 5, preparation and bonding of spherical patch layer 4: placing TPU material into supercritical foaming equipment, performing supercritical foaming treatment, preparing multiple spherical patch layers 4, and after the foaming is completed, performing necessary cooling and shaping treatment.

[0052] Step 6: If you need to add a pattern, logo or brand logo on the surface of the sphere, you can print or heat transfer it on the surface / bottom of the TPU film.

[0053] Step 7: Use a hot pressing process to tightly adhere the TPU film to the outer surface of the spherical patch layer 4.

[0054] Step 8, use a suitable adhesive to bond the multiple spherical patch layers 4 together, and ensure that they are closely attached to the periphery of the foamed ball core 2. During the bonding process, pay attention to adjusting the position to ensure that the roundness and size of the entire sphere meet the requirements.

[0055] Step 9, quality inspection and packaging: Conduct quality inspection on the completed supercritical process hollow sphere structure, package the qualified spheres, and store them in a proper environment.

[0056] See also Figure 2 As shown, Example 2:

[0057] Example 2 provides another specific implementation scheme of a hollow ball structure based on supercritical technology, which is similar to Example 1 in basic structure, but different in the design and splicing method of the foaming ball core 2. The following is a specific description of Example 2:

[0058] Design and splicing of the foaming core 2: In Example 2, the foaming core 2 is composed of 6 splicing bodies 211, which is different from the two splicing bodies 211 in Example 1. These 6 splicing bodies 211 are tightly combined together through a specific connection method (hot melt) to form a complete foaming core 2. Moreover, unlike the hollow cavity 1 located inside the foaming core 2 in Example 1, the hollow cavity 1 in Example 2 is located on the surface of the foaming core 2. This means that when the 6 splicing bodies 211 are connected, they together constitute the foaming core 2, and the hollow cavities 1 are distributed on this shell.

[0059] See also Figure 3 As shown, Example 3:

[0060] In Example 3, we use 6 assemblies to construct the foam core 2. After these assemblies are assembled, not only a hollow cavity 1 is formed at the center of the foam core 2, but also additional hollow cavities 1 are created on its surface, thereby combining the characteristics of Example 1 (internal hollow cavity 1) and Example 2 (surface hollow cavity 1).

[0061] See also Figure 4 As shown, Example 4

[0062] In Example 4, we use a supercritical integrated foaming process to manufacture the foamed core 2, and the foamed core 2 naturally forms an internal hollow cavity 1 during the foaming process without the need for additional assembly steps.

[0063] Example 5: Foamed spherical core structure with a hollow cavity on the surface and no cavity inside

[0064] In Example 5, we designed a foamed ball core structure, which is characterized in that a plurality of hollow cavities are arranged on the surface of the foamed ball core to increase the grip of the ball, while there is no specially designed hollow cavity inside the foamed ball core.

[0065] See also Figure 6 As shown, Example 6:

[0066] In Example 6, we use an integrated foaming process similar to that of Example 4 and Example 5 to manufacture the foam core 2, but make innovations on this basis, that is, a plurality of hollow cavities 1 are provided on the surface of the foam core 2 and hollow cavities 1 are also provided inside the foam core 2.

[0067] In summary, the above-mentioned embodiments 1-6 all have the following characteristics:

[0068] 1. The foamed ball core 2 and the spherical surface patch layer 4 are prepared by using a supercritical foaming process, and the supercritical foaming process is used to enable the ball to recover to its original shape more quickly after being impacted by external forces. This improvement significantly improves the use experience and effect of the ball, and meets the athlete's requirements for high elasticity and high reaction speed of the ball in a continuous collision environment.

[0069] 2. The design of the reinforcement layer 3 and the spherical patch layer 4 enhances the structural stability, wear resistance and aesthetics of the sphere. The material prepared by the supercritical foaming process itself also has high durability and aging resistance, thereby extending the service life of the sphere and reducing the frequency of replacing the sphere and the cost of use.

[0070] 3. Since the sphere of the present invention is a hollow structure and does not need to be inflated, the cumbersome process of checking air pressure and replenishing gas required for traditional inflatable spheres is avoided. This improvement not only improves the convenience of the user, but also reduces the risk of sphere damage caused by improper maintenance. In addition, the supercritical process hollow sphere structure is also suitable for a variety of sports scenes and athlete needs, such as basketball, football, volleyball, etc., and has broad application prospects.

[0071] 4. The outermost surface of the spherical patch layer 4 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 between the ball and the ground or air during its rotation on the ground and in the air, making the ball smoother and improving the excellent performance of the ball's motion trajectory; on the other hand, the grooves also facilitate drainage, especially in humid or rainy environments, which can effectively prevent water accumulation from affecting the controllability and trajectory 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 and passing the ball. The groove design on the surface of the spherical patch not only improves the practicality of the ball, but also brings a more excellent experience to ball sports.

[0072] Resilience test experiment:

[0073] 1. Purpose of the experiment

[0074] The purpose of this experiment is to verify whether the hollow ball structure prepared by supercritical technology (hereinafter referred to as the "experimental ball") is superior to the basketball or football of the same size on the market (hereinafter referred to as the "control ball") in terms of rebound force.

[0075] 2. Experimental Materials and Equipment

[0076] 2.1 Experimental Materials

[0077] Experimental group: The supercritical process hollow sphere 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.

[0078] Control group: Inflatable footballs of the same size (20.5 cm) randomly selected from the market, made of polyvinyl chloride (PVC) or other rubber or plastic and rubber-plastic copolymer materials.

[0079] 2.2 Experimental equipment

[0080] See also Figure 8 , High-precision rebound tester: used to accurately measure the rebound height of the ball.

[0081] 3. Experimental steps

[0082] Preparation stage:

[0083] Make sure that both the experimental and control products are in new, unused condition.

[0084] Using a height measuring tape, mark a height of 2.00 m at the release point of each sphere.

[0085] Testing phase:

[0086] For each sphere, release it from the marked release point and let it fall freely and rebound.

[0087] Use a rebound tester to measure the rebound height of the ball when it rebounds to its highest point.

[0088] This process was repeated 10 times to obtain stable experimental data.

[0089] Data recording and processing:

[0090] 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.

[0091] 4. Experimental Data

[0092]

[0093]

[0094] 5. Data Analysis

[0095] 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 1307MM, and the average rebound rate is 65.35%; 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.

[0096] VI. Conclusion

[0097] This experiment verified through comparative tests that the hollow ball structure prepared by supercritical technology is significantly better than the common footballs on the market in terms of rebound force. The experimental data showed that the average rebound rate and rebound height of the experimental ball were higher than those of the control ball, and the difference was significant.

[0098] Ball consistency performance test:

[0099] 1. Purpose of the experiment

[0100] This experiment aims to verify the consistency of the roundness of the hollow sphere structure prepared by supercritical process (experimental group) and the traditional inflatable sphere (control group) after a certain use (such as impact, extrusion, etc.) through comparative testing. By measuring and comparing the roundness changes before and after use, the performance of the two spheres in maintaining shape stability is evaluated.

[0101] 2. Experimental Materials

[0102] The samples in the experimental group were: 3 hollow sphere structures prepared by supercritical process, with a diameter of about 15 cm, numbered A1, A2, and A3. The samples in the control group were: 3 traditional inflatable spheres, with a diameter of about 15 cm, numbered B1, B2, and B3.

[0103] 3. Test equipment and tools

[0104] Durability tester (capable of simulating the impact, extrusion, etc. of a ball in actual use) and roundness measuring instrument (see Fig. 9 , accuracy 0.01mm)

[0105] IV. Experimental Procedure

[0106] Pretreatment and initial measurement: All spheres are placed at room temperature for 24 hours to eliminate the influence of temperature differences on the experimental results. Use a roundness measuring instrument 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, extrusion and other conditions of the sphere in actual use. The test time can be set according to standard requirements, such as 4 hours, to ensure that the sphere has undergone sufficient use simulation. Post-use measurement: After the test, all spheres are taken out and measured again at the same measurement point on each sphere using a roundness measuring instrument, 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.

[0107] 5. Experimental data output

[0108] Initial roundness data (unit: mm):

[0109] Sphere number Measuring point 1 Measuring point 2 Measuring point 3 Average roundness A1 75.00 75.01 74.99 75.00 A2 75.02 75.00 75.03 75.02 A3 74.98 75.00 75.01 74.99 B1 75.00 75.01 74.98 74.99 B2 75.01 75.00 75.02 75.01 B3 74.99 75.00 74.97 74.99

[0110] After using the roundness data:

[0111]

[0112]

[0113] According to the experimental data, it can be concluded that the hollow sphere structure prepared by supercritical process (experimental group) has better roundness consistency than the traditional inflatable sphere (control group) after use simulation. The roundness change of the sphere in the experimental group is small, indicating that it can better maintain shape stability under the use of impact, extrusion, etc. This proves the effectiveness of the hollow sphere structure prepared by supercritical process in improving the roundness consistency of the sphere.

[0114] The above implementation modes are merely descriptions of the preferred implementation modes 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 and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A hollow sphere structure based on supercritical technology, characterized in that: The invention comprises a foaming core, a plurality of hollow cavities are formed inside or on the surface of the foaming core or inside and on the surface, a reinforcing layer is arranged on the periphery of the foaming core, and a spherical patch layer is attached to the periphery of the reinforcing layer, and the foaming core and / or the spherical patch layer are prepared by supercritical foaming process.

2. The hollow sphere structure based on supercritical process 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 hollow sphere structure based on supercritical process according to claim 1, characterized in that: The outer surface of the spherical patch layer is bonded with a thin film layer.

4. The hollow sphere structure based on supercritical process according to claim 1, characterized in that: The foamed sphere core is foamed in one piece by a supercritical foaming process.

5. The hollow sphere structure based on supercritical process according to claim 1, characterized in that: The foam ball core is composed of a plurality of spliced ​​bodies.

6. The hollow sphere structure based on supercritical process 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.

7. The hollow sphere structure based on supercritical process 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 gluing.

8. The hollow sphere structure based on supercritical process according to claim 1, characterized in that: The spherical patch layer is made of at least one of polyurethane, EVA, TPE, SBR, NBR, EPDM, SBL, POE, PE, TPR, TPU, and TPEE materials and is foamed through a supercritical process.

9. The hollow sphere structure based on supercritical process according to claim 8, characterized in that: The thickness of the spherical patch layer is 1mm-20mm, the thickness of the film layer is 0.1mm-3mm, and the film layer is made of at least one material selected from polyurethane, EVA, TPE, SBR, NBR, EPDM, SBL, POE, PE, TPR, TPU, and TPEE.

10. The hollow sphere structure based on supercritical process according to claim 9, 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.

11. The hollow sphere structure based on supercritical process according to claim 1, characterized in that: The surface of the spherical patch layer is provided with grooves.

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