Hollow sphere structure based on supercritical process

Abstract

The utility model relates to the field of sports goods, in particular to a hollow sphere structure based on supercritical technology, 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 arranged on the periphery of the foaming sphere center, and a spherical patch layer attached to the periphery of the foaming sphere center. The foaming sphere center or / and the spherical surface patch layer can be prepared by adopting a supercritical foaming process, the process has the roundness consistency and excellent elasticity and restorability during processing, and the roundness consistency of the spherical surface patch layer can be better ensured after external force impact.

Description

Technical Field

[0001] This utility model relates to the field of sporting goods, and more particularly to a hollow sphere structure based on supercritical technology. Background Technology

[0002] In existing technologies, most bouncy balls or related spheres in the sporting goods field are designed to be inflated. While this design meets the usage requirements of the spheres to some extent, it has some inherent shortcomings. First, inflating the spheres requires checking the air pressure and replenishing the gas, which necessitates additional inflation equipment, increasing inconvenience for users and adding extra costs. Second, the elasticity of inflatable spheres is often limited by the gas pressure and the choice of sphere material. Many spheres cannot quickly return to their original shape after being impacted by external forces, exhibiting insufficient elasticity and resilience. This results in the inability to guarantee the consistency of the sphere's roundness during use.

[0003] Meanwhile, the traditional manufacturing process of spheres typically involves multiple complex steps, such as material preparation, molding, inflation, sealing, and testing. Each step requires precise control, and the processes are closely interconnected. If any step goes wrong, it may be necessary to start over, resulting in low overall production efficiency.

[0004] For example, the inflation process and subsequent deflation tests are indispensable parts of sphere manufacturing, but these steps are relatively time-consuming. Inflation requires ensuring that the pressure inside the sphere reaches the standard, while the deflation test verifies the sphere's sealing performance; both of these increase the overall manufacturing time. Furthermore, due to the complex preparation process and long production time, traditional sphere manufacturing often requires more workers to collaborate and ensure the smooth operation of the production line. Each stage of traditional sphere manufacturing consumes energy, such as material heating, the operation of molding equipment, and the energy consumption of inflation equipment. Long-term, large-scale production leads to significant energy consumption, which is detrimental to energy conservation and environmental protection.

[0005] Specifically, commonly used sports balls on the market, such as basketballs and soccer balls, are mainly made of polyurethane (PU), polyvinyl chloride (PVC), or other rubber or rubber-plastic copolymer materials. The manufacturing process of these materials is limited by traditional inflatable ball manufacturing techniques, resulting in deficiencies in elasticity, abrasion resistance, and aging resistance. When subjected to external impact, these inflatable balls often fail to quickly return to their original shape, affecting their performance and user experience. Furthermore, because the inflatable ball contains gas, if it is punctured by a sharp object such as a shoe spike or subjected to excessive pressure, the gas may gradually leak out, causing the ball to lose its functionality. This design not only increases the risk of use but also limits the ball's application in certain special environments.

[0006] Therefore, existing sports balls have shortcomings in terms of elasticity and resilience, service life, and ease of maintenance, requiring a new type of structure and material to improve and enhance them. Utility Model Content

[0007] To address the aforementioned issues, this invention provides a hollow sphere structure based on supercritical technology. By employing supercritical foaming technology to prepare the foamed sphere core and spherical patch layer, the sphere can more quickly return to its original shape after being subjected to external impact. Furthermore, the sphere is hollow and requires no inflation, thus avoiding the cumbersome process of checking air pressure and replenishing gas required by traditional inflatable spheres. This improvement not only enhances user convenience but also avoids increased overall costs due to the need for inflation and maintenance of inflatable spheres, and prevents situations where inflation is required, thus avoiding disruptions during the competition.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a hollow sphere structure based on supercritical process, including a foamed sphere core, a plurality of hollow cavities formed inside or on the surface of the foamed sphere core, a reinforcing layer is provided on the periphery of the foamed sphere core, and a spherical patch layer is attached to the periphery of the reinforcing layer, the foamed sphere core and / or the spherical patch layer are prepared by supercritical foaming process.

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

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

[0011] As a further optimization, the foamed core is integrally foamed using a supercritical foaming process.

[0012] As a further optimization, the foam core is composed of multiple spliced ​​parts.

[0013] As a further optimization, the reinforcing layer is made of non-woven or woven fabric, which is then heat-pressed / adheded to the periphery of the foamed core.

[0014] As a further optimization, the reinforcing layer is a winding layer, which is bonded to the periphery of the foamed sphere core by adhesive bonding.

[0015] As a further optimization, 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 using a supercritical process.

[0016] As a further optimization, the thickness of the spherical patch layer is 1mm-20mm, and the thickness of the film layer is 0.1mm-3mm. 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, the inner or outer layer of the thin film layer is provided with a printing layer by means of spraying paint, printing, heat transfer printing, water transfer printing, cold transfer printing, or pad printing.

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

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. By employing supercritical foaming technology to prepare the foamed core and spherical patch layer, the sphere can more quickly recover its original shape after being subjected to external impact. This improvement significantly enhances the user experience and performance of the sphere, meeting the high elasticity and high responsiveness requirements of athletes in environments with continuous impacts.

[0021] 2. The design of the reinforcing layer and 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, thereby extending the service life of the sphere and reducing the frequency of sphere replacement and usage costs.

[0022] 3. Because the sphere of this invention has a hollow structure and does not require inflation, it avoids the cumbersome process of checking air pressure and replenishing gas required by traditional inflatable spheres. This improvement not only enhances user convenience but also reduces the risk of sphere damage due to improper maintenance. Furthermore, the supercritical hollow sphere structure is suitable for various sports scenarios and athlete needs, such as basketball, soccer, and volleyball, and has broad application prospects.

[0023] 4. The outermost surface of the spherical patch layer can be grooved according to actual needs. These grooves are ingeniously designed and have multiple functions: Firstly, they significantly reduce the friction between the ball and the ground or air during its rotation, making the ball smoother and improving its trajectory. Secondly, the grooves also facilitate drainage, especially in humid or rainy conditions, effectively preventing water accumulation from affecting the ball's control and trajectory. Furthermore, the grooves increase the ball's grip, improving the stability and accuracy of catching and passing. The grooved design on the spherical patch surface not only enhances the ball's practicality but also provides a superior experience for ball sports.

[0024] 5. The proposed solution employs supercritical foaming technology to prepare the foamed sphere core and spherical patch layer. This process significantly simplifies the manufacturing process compared to traditional inflatable bodies. Supercritical foaming can complete material foaming and molding in a shorter time, eliminating the need for complex inflation and deflation tests, thus significantly improving production efficiency while reducing energy consumption and waste. Furthermore, the simplified manufacturing process and shorter manufacturing time directly lead to a reduction in the number of personnel required. The more automated supercritical foaming process reduces reliance on manual operation, thereby lowering labor costs and improving the stability and reliability of the production line.

[0025] 6. The spheres prepared by the method in this application have fixed properties (quantitative data), which means that the size, shape, performance and other parameters of the spheres can be precisely controlled, which better meets the requirements of automated processes and makes the entire production process smoother and more efficient. Attached Figure Description

[0026] Figure 1 This is a cross-sectional schematic diagram of the spherical structure in Example 1.

[0027] Figure 2 This is a cross-sectional structural diagram of the sphere structure in Example 2.

[0028] Figure 3 This is a cross-sectional structural diagram of the sphere structure in Example 3.

[0029] Figure 4 This is a cross-sectional schematic diagram of the spherical structure in Example 4.

[0030] Figure 5 This is a cross-sectional structural diagram of the spherical structure in Example 5.

[0031] Figure 6 This is a cross-sectional structural diagram of the sphere structure in Example 6.

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

[0033] The following are the symbols and their meanings: 1. Hollow cavity; 2. Foamed core; 211. Spliced ​​body; 3. Reinforcing layer; 4. Spherical patch layer; 5. Thin film layer. Detailed Implementation

[0034] Please see Figure 1 As shown, Example 1:

[0035] In this specific embodiment, two bowl-shaped splicing bodies 211 are used, and the hollow cavity 1 after splicing is located inside the foamed core 2, that is, at the center of the foamed core 2. The two can be connected by adhesive / thermal fusion. Overall, the split design divides the foamed core 2 into multiple splicing bodies 211, and each splicing body 211 can be molded independently. Compared with one-piece molding, this split molding method makes it easier to control various parameters in the molding process, such as temperature, pressure, and time, thereby reducing the molding difficulty. The split design makes the demolding and part removal process simpler. Since each splicing body 211 can be demolded and removed independently, the problems of demolding difficulties or part damage caused by one-piece molding are avoided.

[0036] Further discussion reveals that the reinforcing layer 3 is a non-woven or woven fabric, which is heat-pressed / adheded to the periphery of the foamed core 2. The woven fabric can be made of yarns such as 20, 30, or 40 count.

[0037] In this specific embodiment, the reinforcing layer 3 is heat-pressed / adheded to the periphery of the foamed core 2 using non-woven or woven fabric, providing superior support and stability. This structural reinforcement allows the sphere to better maintain its shape and integrity when subjected to external impacts, extending its service life. The presence of the reinforcing layer 3 makes the foamed core 2 more durable and reduces performance degradation caused by continuous impacts.

[0038] In another embodiment, the reinforcing layer 3 can be selected as a winding layer, on which adhesive or latex is provided, and the spherical patch layer 4 is bonded to the winding layer by the adhesive or latex. Further defining the technical solution of this utility model, the aforementioned winding layer is made of polyester-cotton yarn, pure cotton yarn, polyester yarn, or nylon yarn.

[0039] Detailed Analysis: The winding layer, constructed from wound yarn, forms a tight and robust structure around the foamed sphere core 2. This structure not only enhances the overall stability of the sphere but also allows it to better disperse and resist impact forces, thus extending its lifespan. The winding layer utilizes high-strength materials such as polyester-cotton yarn, pure cotton yarn, polyester yarn, or nylon yarn. This choice of materials gives the winding layer excellent durability, maintaining stable performance even under prolonged use and frequent, continuous impacts.

[0040] The winding layer is coated with adhesive or latex, which firmly bonds the spherical patch layer 4 to the winding layer. This adhesive bonding method not only improves the bonding strength between the spherical patch layer 4 and the reinforcing layer 3, but also allows the sphere to better maintain the integrity of its overall structure when subjected to external forces. Furthermore, the design of the reinforcing layer 3 offers considerable flexibility, adapting to the needs of different material combinations. For example, different materials and specifications of yarn can be selected to make the winding layer, meeting the performance requirements of different sports scenarios and athletes.

[0041] Detailed analysis: The spherical patch layer 4 is prepared using a supercritical foaming process. This process utilizes the unique properties of supercritical foaming (such as carbon dioxide or nitrogen) at specific temperatures and pressures, causing the material to form an irregular, fine, multi-pore structure during the foaming process (see...). Figure 7 (SEM image of the foamed core 2 obtained in Example 1, observed by scanning electron microscopy (SEM)). This structure endows the spherical patch layer 4 with excellent elasticity, lightweight, 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, and TPR. These materials each have their own characteristics and can be selected according to the usage requirements and performance requirements of the sphere. For example, materials such as polyurethane and TPU have excellent elasticity, resilience, and low-temperature impact resistance, making them suitable for manufacturing high-end sports spheres. At the same time, the spherical patch layer 4 is tightly bonded to the surface of the reinforcing layer 3, forming the outer structure of the sphere. This bonding method not only enhances the structural stability of the sphere but also allows the sphere to better disperse and resist impact forces when subjected to external forces.

[0042] Furthermore, the spherical patch layer 4 can be made of multiple pieces bonded to the periphery of the foamed sphere core 2. This multi-piece bonding design allows for greater flexibility in the production process. Each spherical patch layer 4 can be produced independently and then assembled together, which facilitates parallel production and improves overall production efficiency. Simultaneously, because the spherical patch layer 4 can be produced individually, it is easier to achieve mass production and reduce the cost per piece. This design also reduces material waste, further lowering costs.

[0043] Furthermore, the film layer 5 can be made of materials such as TPU, PVC, PU, ​​TPE, TPR, PET, and EVA. These materials possess excellent flexibility, abrasion resistance, and chemical corrosion resistance, protecting the foamed spherical layer 31 from environmental damage. The film layer 5 not only improves the durability of the sphere but also endows it with better waterproof, dustproof, and stain-resistant properties. This allows the sphere to maintain stable performance even in humid or harsh environments. Simultaneously, as the outer layer of the spherical patch layer 4, the film layer 5 can be printed using techniques such as spray painting, printing, heat transfer printing, water transfer printing, cold transfer printing, and pad printing. This printed layer can support rich visual elements, such as patterns, logos, and brand identifiers, thereby enhancing the sphere's aesthetics and personalization.

[0044] Specific manufacturing process of hollow sphere structures using supercritical technology:

[0045] Step 1, Material Preparation: Foamed Core 2 Material: TPU; Reinforcing Layer 3 Material: Polyester-cotton yarn as the winding layer material; Film Layer 5 Material: TPU film.

[0046] Step 2, Preparation of splice 211: Divide the polyurethane material into two portions and place them into two molds in a supercritical foaming equipment. Set the temperature of the supercritical foaming equipment to 120℃, the pressure to 25MPa, and the foaming time to 30 minutes. Perform supercritical foaming treatment according to the set process parameters (since supercritical foaming is an existing technology, its process parameters and flow will not be elaborated here; please refer to CN202411031408.5 or CN202410925729.3, etc.) to obtain two hollow foamed hemispheres with irregular, fine, multi-cellular structures. After foaming, remove the hollow foamed hemispheres and perform necessary cooling and shaping treatments.

[0047] Step 3, Joining the splice 211: Use a suitable adhesive (such as hot melt adhesive, polyurethane adhesive, etc.) to bond the two splice 211 together to form a complete foam core 2. Ensure the bonded area is flat and firm.

[0048] Step 4, Fabrication and bonding of reinforcing layer 3: Use polyester-cotton yarn as the winding layer material, and wind it according to the preset winding method and parameters. Use latex as an adhesive to tightly bond the winding layer to the outer periphery of the foam core 2.

[0049] Step 5, Preparation and bonding of spherical patch layer 4: Place TPU material into a supercritical foaming equipment for supercritical foaming treatment to prepare multiple spherical patch layers 4. After foaming, perform necessary cooling and shaping treatment.

[0050] Step 6: If you need to add patterns, logos, or branding to the surface of the sphere, you can print or heat transfer the design onto the surface / bottom of the TPU film.

[0051] Step 7: Use a hot-pressing process to tightly bond the TPU film to the outer surface of the spherical patch layer 4.

[0052] Step 8: Using a suitable adhesive, bond multiple spherical patch layers 4 together, ensuring they adhere tightly to the outer periphery of the foamed sphere core 2. During bonding, pay attention to adjusting the position to ensure the overall roundness and size of the sphere meet the requirements.

[0053] Step 9, Quality Inspection and Packaging: Conduct quality inspection on the completed supercritical hollow sphere structure, package the qualified spheres, and store them in a suitable environment.

[0054] Please see Figure 2 As shown, Example 2:

[0055] Example 2 provides another specific implementation scheme for a hollow sphere structure based on supercritical technology. This scheme is similar to Example 1 in basic structure, but differs in the design and assembly method of the foamed sphere core 2. The following is a detailed description of Example 2:

[0056] Design and assembly of the foamed core 2: In Example 2, the foamed core 2 is composed of six splicing bodies 211, which differs from the two splicing bodies 211 in Example 1. These six splicing bodies 211 are tightly joined together by a specific connection method (thermal fusion) to form a complete foamed core 2. Moreover, unlike in Example 1 where the hollow cavity 1 is located inside the foamed core 2, in Example 2 the hollow cavity 1 is located on the surface of the foamed core 2. This means that when the six splicing bodies 211 are connected, they together constitute the foamed core 2, while the hollow cavities 1 are distributed on this outer shell.

[0057] Please see Figure 3 As shown, Example 3:

[0058] In Example 3, we use 6 assembled parts to construct the foamed sphere core 2. After these assembled parts are assembled, they not only form a hollow cavity 1 at the center of the foamed sphere core 2, but also create additional hollow cavities 1 on its surface, thus combining the features of Example 1 (internal hollow cavity 1) and Example 2 (surface hollow cavity 1).

[0059] Please see Figure 4 As shown, Example 4

[0060] In Example 4, we used a supercritical integrated foaming process to manufacture the foamed core 2. The foamed core 2 naturally forms an internal hollow cavity 1 during the foaming process, without the need for additional assembly steps.

[0061] Example 5: Foamed spherical core structure with hollow cavities on the surface and no cavities inside.

[0062] In Example 5, we designed a foamed ball core structure, characterized by having several hollow cavities on the surface of the foamed ball core to increase the grip of the ball, while the interior of the foamed ball core does not have any specially designed hollow cavities.

[0063] Please see Figure 6 As shown, Example 6:

[0064] In Example 6, we used an integral foaming process similar to that in Examples 4 and 5 to manufacture the foamed core 2, but we made an innovation on this basis. That is, several hollow cavities 1 were also provided on the surface of the foamed core 2, and hollow cavities 1 were also provided inside the foamed core 2.

[0065] In summary, all of the above embodiments 1-6 have the following characteristics:

[0066] 1. By employing a supercritical foaming process to prepare the foamed core 2 and the spherical patch layer 4, the sphere can more quickly recover its original shape after being subjected to external impact. This improvement significantly enhances the user experience and performance of the sphere, meeting the athletes' requirements for high elasticity and high responsiveness in environments with continuous impacts.

[0067] 2. The design of the reinforcing 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 also has high durability and aging resistance, thereby extending the service life of the sphere and reducing the frequency of sphere replacement and usage costs.

[0068] 3. Because the sphere of this invention has a hollow structure and does not require inflation, it avoids the cumbersome process of checking air pressure and replenishing gas required by traditional inflatable spheres. This improvement not only enhances user convenience but also reduces the risk of sphere damage due to improper maintenance. Furthermore, the supercritical hollow sphere structure is suitable for various sports scenarios and athlete needs, such as basketball, soccer, and volleyball, and has broad application prospects.

[0069] 4. The outermost surface of the spherical patch layer 4 can be fitted 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 the ball's rotation on the ground and in the air, making the ball smoother and improving the ball's trajectory; on the other hand, the grooves also facilitate drainage, especially in humid or rainy environments, effectively preventing water accumulation from affecting the ball's control and trajectory. In addition, the presence of grooves increases the ball's grip, 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 enhances the ball's practicality but also brings a superior experience to ball sports.

[0070] Rebound force test experiment:

[0071] I. Experimental Objective

[0072] This experiment aims to verify whether a hollow sphere structure prepared using a supercritical process (hereinafter referred to as "experimental sphere") is superior to a basketball or soccer ball of the same size on the market (hereinafter referred to as "control sphere") in terms of rebound force.

[0073] II. Experimental Materials and Equipment

[0074] 2.1 Experimental Materials

[0075] Experimental group: The hollow sphere structure prepared by supercritical process in Example 1 has a diameter of 20.5 cm. The foamed sphere core 2 is made of TPU foam material, the spherical patch layer 4 is also made of TPU foam material, the reinforcing layer 3 is a polyester-cotton yarn winding layer, and the film layer 5 is a TPU film.

[0076] Control group: Inflatable soccer balls of the same size (20.5 cm) randomly selected from the market, which may be made of polyvinyl chloride (PVC) or other rubber or plastic and rubber-plastic copolymer materials.

[0077] 2.2 Experimental Equipment

[0078] High-precision rebound tester: used to accurately measure the rebound height of a sphere.

[0079] III. Experimental Procedure

[0080] Preparation phase:

[0081] Ensure that both the experimental and control group products are brand new and unused.

[0082] Using a height measuring ruler, mark a height of 2.00 meters at the release point of each sphere.

[0083] Testing phase:

[0084] For each sphere, release it from the marked release point, allowing it to fall freely and bounce back.

[0085] Use a rebound tester to measure the rebound height of the ball when it rebounds to its highest point.

[0086] Repeat this process 10 times to obtain stable experimental data.

[0087] Data recording and processing:

[0088] Record the rebound height for each test and calculate the average rebound height and rebound rate (average rebound height / release height × 100%). Perform statistical analysis on the data to verify whether the difference between the two sets of data is significant.

[0089] IV. Experimental Data

[0090]

[0091]

[0092] V. Data Analysis

[0093] The bounce test reports from both the experimental and control groups show that the experimental ball had an average rebound height of 1307 mm and an average rebound rate of 65.35%, while the control ball had an average rebound height of 1179 mm and an average rebound rate of 58.95%. This demonstrates that the experimental ball's rebound force was significantly better than that of the control ball.

[0094] VI. Conclusion

[0095] This experiment, through comparative testing, verified that the hollow sphere structure prepared using supercritical technology significantly outperforms commercially available soccer balls in terms of rebound force. Experimental data showed that the average rebound rate and rebound height of the experimental ball were both higher than those of the control ball, and the differences were significant.

[0096] Sphere consistency performance test:

[0097] I. Experimental Objective

[0098] This experiment aims to verify, through comparative testing, the consistency in roundness retention between hollow spheres prepared using supercritical technology (experimental group) and traditional inflatable spheres (control group) after a certain period of use (such as impact and compression). By measuring and comparing the changes in roundness before and after use, the performance of the two types of spheres in maintaining shape stability is evaluated.

[0099] II. Experimental Materials

[0100] Experimental group samples: 3 hollow spheres, approximately 15 cm in diameter, prepared using supercritical technology, numbered A1, A2, and A3. Control group samples: 3 conventionally inflatable spheres, approximately 15 cm in diameter, numbered B1, B2, and B3.

[0101] III. Testing Equipment and Tools

[0102] Durability testing machine (capable of simulating impacts, compression, etc., of a sphere in actual use) and roundness measuring instrument (accuracy 0.01mm)

[0103] IV. Experimental Procedure

[0104] Pretreatment and Initial Measurement: All spheres were placed at room temperature for 24 hours to eliminate the influence of temperature differences on the experimental results. A roundness measuring instrument was used to measure the roundness at multiple evenly distributed points on each sphere, and the initial roundness data (i.e., the distance from the sphere's surface to its center) was recorded at each point. Simulation Testing: The spheres of the experimental and control groups were placed in a durability testing machine, and the impact frequency, force, and test time were set to simulate the impacts and compression experienced by the spheres in actual use. The test time can be set according to standard requirements, such as 4 hours, to ensure that the spheres undergo sufficient usage simulation. Post-Use Measurement: After the test, all spheres were removed, and the roundness measuring instrument was used again to measure the roundness at the same measurement points on each sphere, recording the roundness data after use. Data Recording and Analysis: The change in roundness of each sphere before and after use (i.e., the difference between the post-use roundness data and the initial roundness) was calculated. The differences in the consistency of roundness between the experimental and control groups were analyzed and compared.

[0105] V. Experimental Data Output

[0106]

[0107] Initial roundness data (unit: mm):

[0108] Roundness data after use:

[0109]

[0110] Based on the experimental data, it can be concluded that the hollow sphere structure prepared using supercritical technology (experimental group) maintains better consistency in roundness after simulated use than the traditional inflatable sphere (control group). The smaller change in roundness of the spheres in the experimental group indicates that they can better maintain shape stability under conditions such as impact and compression. This demonstrates the effectiveness of hollow sphere structures prepared using supercritical technology in improving the consistency of sphere roundness.

[0111] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

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

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

3. A hollow sphere structure based on supercritical technology according to claim 1, characterized in that: The foamed core is integrally foamed using a supercritical foaming process.

4. A hollow sphere structure based on supercritical technology according to claim 1, characterized in that: The foam core is composed of multiple spliced ​​parts.

5. A hollow sphere structure based on supercritical technology according to claim 1, characterized in that: The reinforcing layer is made of non-woven or woven fabric, which is attached to the periphery of the foam core by hot pressing or adhesive bonding.

6. A hollow sphere structure based on supercritical technology according to claim 1, characterized in that: The reinforcing layer is a winding layer, which is bonded to the outer periphery of the foamed ball core by adhesive.

7. A hollow sphere structure based on supercritical technology according to claim 2, characterized in that: The inner or outer layer of the thin film layer is provided with a printing layer by means of spraying paint, printing, heat transfer printing, water transfer printing, cold transfer printing, or pad printing.

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

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