Production process for annular wearable article, and smart ring

Abstract

Disclosed in the present invention are a production process for an annular wearable article, and a smart ring. The production process comprises: providing an annular element and a mold, and placing the annular element into a mold cavity; injecting supercritical carbon dioxide for displacement into an annular cavity and a compensation cavity; mixing a pre-prepared plastic material with supercritical carbon dioxide for mixing to form a low-viscosity plastic mixture; injecting the low-viscosity plastic mixture into the annular cavity and the compensation cavity, wherein during injection, the pressure is kept higher than the critical pressure of the supercritical carbon dioxide; controlling the temperature and the pressure to gradually separate the supercritical carbon dioxide from the low-viscosity plastic mixture, and also gradually deposit and solidify the plastic material in the low-viscosity plastic mixture in the annular cavity; and after the plastic material in the annular cavity has been completely solidified, removing the annular element from the mold, cooling same to room temperature, and performing an encapsulation treatment. The technical solution of the present invention can prevent the presence of bubbles inside the solidified plastic material.

Description

Production process of ring-shaped wearable and intelligent ring TECHNICAL FIELD

[0001] The present application relates to the technical field of production of ring-shaped wearable, and particularly relates to a production process of ring-shaped wearable and an intelligent ring. BACKGROUND

[0002] With the rapid development of wearable technology, smart devices are gradually evolving towards miniaturization, portability and multifunctionality. Under this trend, ring-shaped wearable products such as intelligent rings, earrings and bracelets have emerged, which combine the beauty of traditional accessories with advanced electronic technology to provide users with health monitoring, identity verification and other functions. To achieve these functions, various electronic components such as optical sensors, processors and batteries need to be integrated in the inner cavity of the wearable product.

[0003] In order to protect these delicate electronic components and ensure the normal operation of the wearable product, it is necessary to fill the inner cavity of the product with a material in a plastic state. After the plastic state material is solidified and formed, it can effectively connect the outer shell of the product and the electronic components together, achieving the protection functions of fixing electronic components, waterproofing, dustproofing and shockproofing. However, the traditional filling method faces many challenges. During the injection and solidification of the plastic material, air bubbles often form inside, which not only affects the appearance of the product, but also may reduce its waterproof performance and structural strength. Due to the complex internal structure of ring-shaped wearable devices, traditional methods are difficult to ensure that the plastic material is evenly distributed in all spaces, especially in some small corners and gaps. In addition, some plastic materials will shrink during the solidification process, resulting in incomplete filling or internal stress. These problems seriously affect the production quality and yield of ring-shaped wearable devices, and a new production process is urgently needed to solve them. SUMMARY

[0004] The main purpose of the present application is to solve the technical problems of existing production process of ring-shaped wearable products, such as air bubbles in the plastic material, and the inability of the material to effectively fill the internal space of the ring-shaped wearable product.

[0005] The present application provides a production process of ring-shaped wearable, which comprises:

[0006] S1, providing a ring-shaped element and a mold, wherein the ring-shaped element forms a ring-shaped cavity inside, the ring-shaped element is provided with an injection port communicating with the ring-shaped cavity, the mold is provided with a cavity matching the ring-shaped element, and a compensation cavity communicating with the cavity;

[0007] S2, placing the ring-shaped element into the cavity, wherein the outer wall surface of the ring-shaped element is fitted with the inner wall surface of the cavity, and the ring-shaped cavity is communicated with the compensation cavity through the injection port;

[0008] S3, injecting supercritical carbon dioxide into the ring-shaped cavity and the compensation cavity to replace all air in the ring-shaped cavity and the compensation cavity;

[0009] S4, mixing the pre-prepared plastic material with supercritical carbon dioxide for mixing to form a low-viscosity plastic mixture; and injecting the low-viscosity plastic mixture into the ring-shaped cavity and the compensation cavity, and maintaining the pressure higher than the critical pressure of supercritical carbon dioxide during the injection;

[0010] S5, controlling the temperature and pressure to gradually precipitate supercritical carbon dioxide from the low-viscosity plastic mixture, and gradually deposit and solidify the plastic material in the low-viscosity plastic mixture in the ring-shaped cavity; in this process, the low-viscosity plastic mixture in the compensation cavity is used to supplement the part of the low-viscosity plastic mixture in the ring-shaped cavity which is reduced in volume due to the precipitation of supercritical carbon dioxide;

[0011] S6, after the plastic material in the ring-shaped cavity is completely solidified, taking out the ring-shaped element from the mold, cooling to room temperature and performing packaging treatment.

[0012] Optionally, the ring-shaped element comprises oppositely arranged outer ring-shaped wall and inner ring-shaped wall, and the injection port is formed between the outer ring-shaped wall and the inner ring-shaped wall;

[0013] The mold comprises oppositely arranged ring-shaped outer side wall and ring-shaped inner side wall, and the compensation cavity and the fluid passage communicated with the compensation cavity are formed between the ring-shaped outer side wall and the ring-shaped inner side wall;

[0014] The distance between the ring-shaped outer side wall and the ring-shaped inner side wall is smaller than the distance between the outer ring-shaped wall and the inner ring-shaped wall; wherein,

[0015] After the ring-shaped element is placed in the cavity, the inner wall surface of the ring-shaped outer side wall and the inner wall surface of the ring-shaped inner side wall are both located between the outer ring-shaped wall and the inner ring-shaped wall, and the low-viscosity plastic mixture flows into the compensation cavity through the fluid passage and flows into the ring-shaped cavity under the guidance of the inner wall surface of the ring-shaped outer side wall or the inner wall surface of the ring-shaped inner side wall.

[0016] Optionally, the outer ring-shaped wall is provided with an outer ring-shaped abutting wall, and the inner ring-shaped wall is provided with an inner ring-shaped abutting wall; wherein,

[0017] After the ring-shaped element is placed in the cavity, the outer ring-shaped side wall is moved and its end portion is brought into abutment with the outer ring-shaped abutment wall, and the inner ring-shaped side wall is moved and its end portion is brought into abutment with the inner ring-shaped abutment wall.

[0018] Optionally, the S3 comprises:

[0019] S3.1, placing the mold containing the ring-shaped element in a high-pressure reactor, the high-pressure reactor comprising an inlet valve and an exhaust valve;

[0020] S3.2, sealing the high-pressure reactor and adjusting the internal temperature of the high-pressure reactor to 35-40°C;

[0021] S3.3, opening the exhaust valve, and injecting replacement supercritical carbon dioxide into the high-pressure reactor through the inlet valve, with an initial injection pressure of 80-100 bar;

[0022] S3.4, after continuously injecting replacement supercritical carbon dioxide for 15-20 minutes, closing the exhaust valve and the inlet valve, and maintaining the pressure of the high-pressure reactor.

[0023] Optionally, the S4 comprises:

[0024] S4.1, mixing the pre-prepared plastic material with mixed supercritical carbon dioxide in a high-pressure mixer for 5-10 minutes to form a low-viscosity plastic mixture;

[0025] S4.2, controlling the temperature of the high-pressure mixer at 40-50°C, and maintaining the pressure at 100-120 bar;

[0026] S4.3, opening the injection valve connected to the mold on the high-pressure reactor, and injecting the low-viscosity plastic mixture into the ring-shaped cavity and the compensation cavity, with an injection rate controlled at 0.1-0.5 ml / s;

[0027] S4.4, during the injection process, maintaining the pressure in the ring-shaped cavity and the compensation cavity at 110-130 bar;

[0028] S4.5, after completing the injection, closing the injection valve to ensure that the low-viscosity plastic mixture fills the ring-shaped cavity and the compensation cavity.

[0029] Optionally, the S5 comprises:

[0030] S5.1, controlling the temperature of the high-pressure reactor at 45-55°C for 30 minutes;

[0031] S5.2, slowly reduce the pressure in the high-pressure reactor at a rate of 0.5-1 bar / min, so that the supercritical carbon dioxide gradually separates from the low-viscosity plastic-like mixture;

[0032] S5.3, gradually increase the temperature of the high-pressure reactor to 60-70°C at a rate of 0.5°C / min, and maintain for 60 minutes;

[0033] S5.4, continue to reduce the pressure in the high-pressure reactor, and the reduction rate is slowed down to 0.3-0.5 bar / min;

[0034] S5.5, increase the temperature of the high-pressure reactor to 70-80°C, and maintain for 90 minutes;

[0035] S5.6, slowly reduce the pressure in the high-pressure reactor to atmospheric pressure at a rate of 0.1-0.2 bar / min;

[0036] S5.7, monitor the pressure change in the annular cavity through the pressure sensor arranged in the high-pressure reactor, so as to ensure that the low-viscosity plastic-like mixture in the compensation cavity can flow into the annular cavity naturally, and compensate the volume reduction caused by the separation of supercritical carbon dioxide, until the plastic-like material in the annular cavity is completely solidified.

[0037] The second aspect of the present application provides a smart ring, comprising:

[0038] an annular element, the annular element comprising an outer annular shell, an inner annular shell, a bezel and a bezel cover, the outer annular shell and the inner annular shell are oppositely arranged, the bottom periphery of the outer annular shell is connected with the bottom periphery of the inner annular shell, the top periphery of the outer annular shell is connected with the bezel, the outer annular shell, the inner annular shell and the bezel jointly define an annular cavity, an injection port in communication with the annular cavity is formed between the top periphery of the bezel and the inner annular shell, and the bezel cover covers the injection port;

[0039] an electronic element arranged in the annular cavity;

[0040] a filler formed by solidification of the plastic-like material, the filler filling the annular cavity.

[0041] Optionally, the material of the inner annular shell is plastic or titanium; and / or,

[0042] the material of the outer annular shell is at least one of titanium, gold, K gold, silver and jade; and / or,

[0043] the material of the bezel is at least one of titanium, gold, K gold, silver and jade; and / or,

[0044] The material of the face cover is at least one of titanium, gold, K gold, silver, or jade.

[0045] Optionally, the electronic component includes a circuit board and a battery.

[0046] The circuit board is electrically connected with the battery.

[0047] The circuit board and the battery are respectively arranged at two positions spaced 180 degrees along the circumference in the annular cavity, so that the weight of the smart ring is evenly distributed.

[0048] Optionally, the inner annular shell is provided with a charging interface, and the electronic component includes a charging component arranged in the annular cavity and electrically connected with the battery and the circuit board respectively, and the charging component is exposed through the charging interface.

[0049] The technical scheme provided by the embodiment of the application has at least the following advantages:

[0050] Firstly, the process effectively replaces all air by injecting replacement supercritical carbon dioxide into the annular cavity and the compensation cavity, avoiding the formation of air bubbles from the source. Supercritical carbon dioxide has the characteristics of low viscosity like a gas and high density like a liquid, and can penetrate every tiny space in the annular cavity, ensuring complete air exclusion. Secondly, the pre-prepared plastic-like material is mixed with mixed supercritical carbon dioxide to form a low-viscosity plastic-like mixture, which significantly reduces the viscosity of the material and improves its flowability. This low-viscosity mixture can uniformly fill every corner of the annular cavity during injection, solving the problem of uneven filling in traditional methods. At the same time, the pressure during injection is maintained above the critical pressure of supercritical carbon dioxide, further ensuring uniform distribution of the material and effective suppression of air bubbles.

[0051] The process of the application realizes slow precipitation of supercritical carbon dioxide and gradual deposition and solidification of the plastic-like material by precisely controlling temperature and pressure. Although the final solidification temperature of the plastic-like material is similar to that of traditional methods, the present scheme significantly improves the solidification process by slow heating and precise pressure control. This gradual temperature control helps to reduce thermal shock and reduces the risk of damage to electronic components. In particular, the present application ingeniously designs the structure of the compensation cavity, which uses the natural flow of the low-viscosity plastic-like mixture in the compensation cavity to timely supplement the part of the mixture in the annular cavity that is reduced due to the precipitation of supercritical carbon dioxide. This design effectively solves the problem of incomplete filling caused by material shrinkage, ensuring the accuracy and integrity of the formed product. In addition, the use of supercritical carbon dioxide improves the thermal conductivity of the material, which helps to more evenly distribute heat during the solidification process and reduces local overheating. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative efforts based on the accompanying drawings are within the protection scope of the present application.

[0053] Fig. 1 is a flow chart of the production process of the annular wearable device of the present application.

[0054] Fig. 2 is a cross-sectional view of an embodiment of the smart ring of the present application.

[0055] Explanation of reference numerals:

[0056] 1, annular element; 11, outer annular shell; 12, inner annular shell; 121, charging interface; 122, inner annular wall; 123, inner annular abutting wall; 13, face ring; 131, outer annular wall; 132, outer annular abutting wall; 14, face cover; 15, annular cavity; 16, injection port; 2, electronic element; 21, circuit board; 22, battery; 23, charging component; 3, filler.

[0057] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the protection scope of the present application.

[0059] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0060] In addition, the description related to "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, "and / or" throughout the text includes three schemes, for example, A and / or B includes A technical solution, B technical solution, and A and B simultaneously meet the technical solution; in addition, the technical solutions of each embodiment can be combined with each other, and must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0061] An embodiment of the present application provides a production process of a ring-shaped wearable device. Figure 1 is a flowchart of a production process of a ring-shaped wearable device provided by an embodiment of the present application.

[0062] Referring to Figure 1, S1, a ring-shaped element 1 and a mold are provided, wherein the ring-shaped element 1 is formed with a ring-shaped cavity 15, the ring-shaped element 1 is provided with an injection port 16 communicating with the ring-shaped cavity 15, the mold is provided with a cavity matching the ring-shaped element 1, and a compensation cavity communicating with the cavity.

[0063] Specifically, in the present embodiment, the ring-shaped element 1 includes an outer ring-shaped shell 11, an inner ring-shaped shell 12 and a face ring 13. The outer ring-shaped shell 11 and the inner ring-shaped shell 12 can be made of different materials. For example, the outer ring-shaped shell 11 can be made of titanium, gold, K gold, silver or jade materials, which not only have good strength and durability, but also meet the aesthetic needs of the wearer. The inner ring-shaped shell 12 is usually made of plastic material, because plastic has good processing performance and electrical insulation, which is conducive to the installation and protection of electronic components 2, in addition, the inner ring-shaped shell 12 can also be made of titanium metal material, which is insulated by process technology, and has the advantages of supporting the hardness of the filler 3 and not easy to deform. The outer ring-shaped shell 11 and the inner ring-shaped shell 12 form a ring-shaped cavity 15 for accommodating electronic components 2. The electronic components 2 include but are not limited to optical sensors, circuit boards 21, charging components 23 and batteries 22, etc. Among them, the optical sensor is the key component to realize the health monitoring function, which is usually installed near the inner ring-shaped shell 12. In order to ensure that the optical sensor can accurately detect the physiological signals of the wearer, a light-transmitting window corresponding to the position of the optical sensor needs to be provided on the inner ring-shaped shell 12. The light-transmitting window is usually made of transparent material, such as optical-grade plastic or glass, to ensure that the optical signal can pass through without obstacles. In the actual manufacturing process, the inner ring-shaped shell 12 can be first made into a basic shape by injection molding, then a light-transmitting window is opened at the corresponding position, and finally the transparent material is fixed at the window position.

[0064] The assembly of the ring-shaped element 1 requires a precise process, which is understood by referring to FIG. 2. Specifically, first, the circuit board 21, the charging component 23, and the battery 22 are wrapped inside the inner ring-shaped shell 12, and then wrapped with an insulating tape for one round to fix the circuit board 21 and the battery 22 inside the cavity of the inner ring-shaped shell 12. Then, the bottom periphery of the inner ring-shaped shell 12 and the bottom periphery of the outer ring-shaped shell 11 are bonded and fixed by glue. Finally, the top periphery of the outer ring-shaped shell 11 and the face ring 13 are fixed together by interference fit, and an appropriate amount of sealant is added to strengthen the fixation. The face ring 13 and the top periphery of the inner ring-shaped shell 12 form the injection port 16 described above.

[0065] The mold mainly consists of two core parts, the male mold and the female mold, which precisely fit together to form the key structure for molding the ring-shaped wearable device.

[0066] The main body of the male mold includes an inner arc-shaped wall corresponding to the outer surface of the outer ring-shaped shell 11, which accurately replicates the outer profile of the outer ring-shaped shell 11. At the top of the inner arc-shaped wall, the male mold extends upward to form an outer barrier wall. This outer barrier wall is a vertical structure. The male mold is made of high-strength tool steel, such as H13 or P20 steel, which has excellent heat resistance and wear resistance, and can maintain stable size and shape in high-temperature and high-pressure injection environments. The female mold contains an outer arc-shaped wall corresponding to the inner surface of the inner ring-shaped shell 12, which accurately matches the inner profile of the inner ring-shaped shell 12. Similar to the male mold, the female mold also extends upward at the top of the outer arc-shaped wall to form an inner barrier wall. The inner barrier wall is also a vertical structure, and is oppositely arranged with the outer barrier wall of the male mold. The material selection of the female mold is the same as that of the male mold, also using high-quality tool steel to ensure stability and durability during injection molding.

[0067] When the male mold and the female mold are closed, the two arc-shaped walls (the inner arc-shaped wall and the outer arc-shaped wall) precisely butt joint to form a ring-shaped cavity. This cavity precisely wraps the ring-shaped element 1. The space between the outer barrier wall of the male mold and the inner barrier wall of the female mold forms a compensation cavity that communicates with the injection port 16. The design of the compensation cavity allows additional material to flow into the ring-shaped cavity 15 during injection and solidification to compensate for the volume shrinkage caused by the precipitation of supercritical carbon dioxide. The volume of the compensation cavity is usually designed to be 5% to 15% of the volume of the ring-shaped cavity 15, which is accurately calculated based on the properties of the plastic material (epoxy resin) used and the amount of supercritical carbon dioxide used.

[0068] The height and spacing of the outer barrier wall and the inner barrier wall need to be carefully designed to ensure that the volume of the compensation cavity is appropriate and can effectively guide the flow of material. The surfaces of these two barriers need to be highly precise and treated to reduce frictional resistance during material flow. Typically, the surfaces of the barriers (the outer barrier wall and the inner barrier wall) are mirror polished.

[0069] Please continue to refer to Fig. 1, S2, the ring-shaped element 1 is placed in the cavity, wherein the outer wall surface of the ring-shaped element 1 is fitted with the inner wall surface of the cavity, and the ring-shaped cavity 15 is communicated with the compensation cavity through the injection port 16;

[0070] In an embodiment of the present application, the ring-shaped element 1 comprises oppositely arranged outer ring-shaped wall 131 and inner ring-shaped wall 122, and the injection port 16 is formed between the outer ring-shaped wall 131 and the inner ring-shaped wall 122;

[0071] The mold comprises oppositely arranged ring-shaped outer side wall and ring-shaped inner side wall, and the compensation cavity and the fluid passage communicated with the compensation cavity are formed between the ring-shaped outer side wall and the ring-shaped inner side wall;

[0072] The distance between the ring-shaped outer side wall and the ring-shaped inner side wall is smaller than the distance between the outer ring-shaped wall 131 and the inner ring-shaped wall 122; wherein,

[0073] After the ring-shaped element 1 is placed in the cavity, the inner wall surface of the ring-shaped outer side wall and the inner wall surface of the ring-shaped inner side wall are both located between the outer ring-shaped wall 131 and the inner ring-shaped wall 122, the low-viscosity plastic mixture flows into the compensation cavity through the fluid passage, and flows into the ring-shaped cavity 15 under the guidance of the inner wall surface of the ring-shaped outer side wall or the inner wall surface of the ring-shaped inner side wall.

[0074] Specifically, please refer to Fig. 2, the outer ring-shaped wall 131 is actually the side wall of the face plate 13 facing the inner ring-shaped shell 12, and the inner ring-shaped wall 122 is the top peripheral edge of the inner ring-shaped shell 12.

[0075] The ring-shaped outer side wall is formed by the structure of the outer barrier wall as described above, and the ring-shaped inner side wall is formed by the structure of the inner barrier wall as described above.

[0076] The distance between the ring-shaped outer side wall and the ring-shaped inner side wall of the mold is designed to be smaller than the distance between the outer ring-shaped wall 131 and the inner ring-shaped wall 122 of the ring-shaped element 1, and this design has the following advantages: it ensures that the material flow is prevented from flowing onto the top of the face plate 13 and the top of the inner ring-shaped shell 12 during injection molding. It helps to control the direction and speed of the material flow. For example, for an injection port 16 with a distance of 3 mm, the corresponding distance in the mold can be designed to be 2.8 mm, and this 0.2 mm difference seems small, but it plays a key role in controlling the material flow.

[0077] In the actual injection molding process, the low viscosity plastic mixture first flows into the compensation cavity through the fluid port. Subsequently, under the guidance of the inner wall surface of the annular outer wall or the inner wall surface of the annular inner wall, the material further flows into the annular cavity 15. This guided flow design effectively prevents material turbulence and reduces bubble formation. For example, by designing micron-level flow guide lines on the mold wall, the material flow path can be further optimized. The depth of these lines is typically between 10 and 50 microns, and the width is between 50 and 200 microns.

[0078] In one embodiment of the present application, the outer annular wall 131 is provided with an outer annular abutment wall 132, and the inner annular wall 122 is provided with an inner annular abutment wall 123.

[0079] After the annular element 1 is placed in the cavity, the annular outer wall is moved and its end abuts against the outer annular abutment wall 132, and the annular inner wall is moved and its end abuts against the inner annular abutment wall 123.

[0080] Specifically, the outer barrier wall and the inner barrier wall in the mold each contain two key parts: a fixed part and a moving part. The moving part of the outer barrier wall is the annular outer wall, and the moving part of the inner barrier wall is the annular inner wall. The core purpose of this design is to achieve precise sealing and positioning during injection molding.

[0081] The outer annular wall 131 on the annular element 1 is provided with an outer annular abutment wall 132, and the inner annular wall 122 is provided with an inner annular abutment wall 123. When the annular element 1 is placed in the cavity, the annular outer wall (i.e. the moving part of the outer barrier wall) moves up and down until its end abuts against the outer annular abutment wall 132. Similarly, the annular inner wall (i.e. the moving part of the inner barrier wall) also moves up and down until it precisely contacts the inner annular abutment wall 123. This double abutment mechanism creates a highly sealed injection molding environment.

[0082] The main purpose of this design is to prevent plastic material from seeping into the tiny gap between the outer wall of the annular element 1 and the inner wall of the cavity during injection. Without this sealing mechanism, even a 0.01 mm gap can cause material to leak, affecting the precision and appearance quality of the product. Through the precise abutment of the annular outer wall and the annular inner wall, a nearly perfect sealing environment is created, ensuring that the injected material can only flow along the predetermined path and fill into the designated annular cavity 15.

[0083] Please continue to refer to Figure 1, S3, inject supercritical carbon dioxide into the annular cavity 15 and the compensation cavity for displacement, to displace all air in the annular cavity 15 and the compensation cavity;

[0084] In one embodiment of the present application, S3 comprises:

[0085] S3.1. Placing the mold containing the annular element 1 inside a high-pressure autoclave, said high-pressure autoclave comprising an inlet valve and an exhaust valve;

[0086] S3.2. Sealing the high-pressure autoclave and adjusting the internal temperature of the high-pressure autoclave to 35-40°C;

[0087] S3.3. Opening the exhaust valve and injecting supercritical carbon dioxide for displacement through the inlet valve into the high-pressure autoclave, with an initial injection pressure of 80-100 bar;

[0088] S3.4. After 15-20 minutes of continuous injection of supercritical carbon dioxide for displacement, closing the exhaust valve and the inlet valve, maintaining the pressure of the high-pressure autoclave.

[0089] In particular, first, the mold containing the annular element 1 is carefully placed inside a high-pressure autoclave. This high-pressure autoclave is a specially designed device, usually made of high-strength alloy steel, capable of withstanding pressures up to 200 bar. The high-pressure autoclave is equipped with an inlet valve and an exhaust valve, both of which play a crucial role throughout the process. The inlet valve is used to control the injection of supercritical carbon dioxide, while the exhaust valve is used to expel the air inside the autoclave and control the internal pressure.

[0090] After placing the mold, the next step is to seal the high-pressure autoclave. Typically, the sealing of the high-pressure autoclave uses high-performance O-rings or metal gaskets, which maintain good sealing performance under high pressure and high temperature conditions. After sealing, the internal temperature of the high-pressure autoclave is adjusted. Adjusting the temperature to the range of 35-40°C is carefully calculated, as this temperature is slightly higher than the critical temperature of carbon dioxide (31.1°C), which is conducive to maintaining the supercritical state of carbon dioxide. Temperature control is usually achieved through external heating elements or internal heating elements built into the outer wall of the autoclave, while multiple temperature sensors are used to ensure the uniformity of the internal temperature of the entire autoclave.

[0091] When the temperature reaches the set range, the exhaust valve is opened, which is to create a flow path for the supercritical carbon dioxide to be injected. Then, the injection of the supercritical carbon dioxide for displacement is started through the inlet valve. The initial injection pressure is set at 80-100 bar, which is much higher than the critical pressure of carbon dioxide (73.8 bar), ensuring that the carbon dioxide always remains in a supercritical state. The precise control of pressure is usually achieved by a high-precision pressure sensor and an electronic control valve. For example, for a high-pressure reactor with a volume of 50 liters, the initial injection rate can be set at 2-3 liters per minute (volume at standard state), which can ensure rapid displacement and prevent the temperature in the reactor from changing suddenly due to too fast injection.

[0092] The injection of supercritical carbon dioxide lasts for 15-20 minutes, which is the best value determined by repeated experiments. During this process, supercritical carbon dioxide can quickly penetrate every corner of the mold due to its unique physical properties (low viscosity like a gas and high density like a liquid), effectively displacing all air. During this process, the gas discharged through the exhaust valve gradually changes from air to pure carbon dioxide, which can be monitored by an online gas analyzer. When the concentration of carbon dioxide in the exhaust gas reaches 99.9% or more, it is considered that the displacement is basically completed.

[0093] After the 15-20 minute injection process is completed, the operator first closes the exhaust valve and then closes the inlet valve, which is important to ensure that the high-pressure reactor maintains sufficient pressure. At this time, the pressure in the high-pressure reactor is usually stabilized at about 90-110 bar, which is sufficient to ensure that the carbon dioxide remains in a supercritical state, creating ideal conditions for the subsequent injection molding process.

[0094] This process of air displacement using supercritical carbon dioxide has several significant advantages. First, it can completely remove the air in the mold and annular cavity 15, which is crucial for preventing air bubbles in the final product. Second, supercritical carbon dioxide has excellent permeability and can enter small spaces that are difficult to reach by traditional methods, ensuring the completeness of displacement. Third, this process is carried out at a relatively mild temperature, which does not cause thermal damage to sensitive electronic components 2 in the annular element 1. Finally, by precisely controlling the temperature and pressure, this process creates an ideal environment for subsequent injection molding, which is beneficial for obtaining high-quality molding results.

[0095] Please continue to refer to Figure 1, S4, mixing the pre-prepared plastic material with the mixed supercritical carbon dioxide to form a low-viscosity plastic mixture; injecting the low-viscosity plastic mixture into the annular cavity 15 and the compensation cavity, maintaining the pressure higher than the critical pressure of supercritical carbon dioxide during the injection process;

[0096] In one embodiment of the present application, S4 comprises:

[0097] S4.1, mixing the pre-prepared plastic material with supercritical carbon dioxide in a high-pressure mixer for 5-10 minutes to form a low-viscosity plastic mixture;

[0098] S4.2, controlling the temperature of the high-pressure mixer at 40-50°C, and maintaining the pressure at 100-120 bar;

[0099] S4.3, opening the injection valve on the high-pressure reactor connected to the mold, and injecting the low-viscosity plastic mixture into the annular cavity 15 and the compensation cavity at an injection rate of 0.1-0.5 ml / s;

[0100] S4.4, maintaining the pressure in the annular cavity 15 and the compensation cavity at 110-130 bar during the injection process;

[0101] S4.5, after the injection is completed, closing the injection valve to ensure that the low-viscosity plastic mixture fills the annular cavity 15 and the compensation cavity.

[0102] In particular, in the embodiments of the present application, the plastic material is preferably epoxy resin, and of course, in other embodiments, it can also be one or a combination of phenolic resin, polyurethane resin, unsaturated polyester resin, silicone resin, melamine formaldehyde resin, and alkyd resin. These materials exhibit good fluidity and plasticity during the injection and molding stages, enabling precise filling of small spaces, and after solidification, they have excellent mechanical strength, weather resistance, and electrical insulation.

[0103] The mixing process lasts for 5-10 minutes, which is the optimal value determined through repeated experiments, ensuring sufficient mixing without causing changes in material properties due to prolonged time. During the mixing process, the temperature of the high-pressure mixer is precisely controlled within the range of 40-50°C, which is carefully selected to ensure that the plastic material maintains good fluidity without triggering cross-linking reactions. At the same time, the pressure in the mixer is maintained at 100-120 bar, which ensures that carbon dioxide remains in a supercritical state and is fully dissolved in the plastic material. For example, for a high-pressure mixer with a volume of 5 liters, the temperature control accuracy is typically required to be ±0.5°C, and the pressure control accuracy needs to be ±1 bar. This precise control is achieved through high-performance temperature sensors, pressure sensors, and PID control systems.

[0104] Once the mixing is completed, the resulting low viscosity plastic-like mixture has unique rheological properties, with a viscosity that can be 50% or even more reduced compared to the original plastic-like material. This low viscosity property is critical for the subsequent precision injection, as it ensures that the material can fill every corner of the annular cavity 15 and the compensation cavity, especially some of the small structural features.

[0105] Next, the injection valve on the high-pressure reactor, which is connected to the mold, is opened, and the low viscosity plastic-like mixture is injected into the annular cavity 15 and the compensation cavity. The injection rate is controlled in the range of 0.1-0.5 ml / s, which is the result of balancing multiple factors. A slower injection rate helps to avoid material turbulence and reduce the formation of air bubbles. For a typical smart ring, the total volume of the annular cavity 15 and the compensation cavity is about 2-3 ml, and at this injection rate, the entire injection process will last 4-30 seconds.

[0106] During the entire injection process, the pressure in the annular cavity 15 and the compensation cavity is strictly controlled in the range of 110-130 bar. This pressure range is higher than the pressure in the mixer, which is to ensure that the low viscosity plastic-like mixture does not cause the dissolved carbon dioxide to precipitate prematurely after entering the cavity due to a sudden drop in pressure. Pressure control is achieved through a high-precision pressure sensor installed on the mold and a feedback control loop connected to the injection system. This precise pressure control not only helps to maintain the low viscosity state of the material, but also promotes uniform distribution of the material, reducing defects such as shrinkage and warping.

[0107] When the low viscosity plastic-like mixture completely fills the annular cavity 15 and the compensation cavity, the injection valve is immediately closed. This closing action needs to be fast and accurate, and can be achieved by using a high-response electromagnetic valve or a pneumatic valve, with a response time controlled within 10 milliseconds. The purpose of quickly closing the valve is to prevent material backflow and ensure that the cavity remains full. After the valve is closed, the system will immediately perform a quick pressure check to confirm that the pressure in the annular cavity 15 and the compensation cavity is maintained within the set range.

[0108] The advantage of this entire process is that it can achieve precise control over the material state and the filling process. By using supercritical carbon dioxide, the viscosity of the plastic-like material is significantly reduced, allowing the material to complete the injection at relatively low temperature and pressure, which not only reduces the thermal stress on the electronic components 2 in the annular element 1, but also reduces the wear of the mold. Precise control of the injection rate and pressure ensures that the material can uniformly fill the complex cavity structure, greatly reducing the formation of defects such as air bubbles and shrinkage. In addition, the design of the compensation cavity provides sufficient material reserves for subsequent material shrinkage compensation, which is crucial for improving the dimensional accuracy and surface quality of the product.

[0109] Please continue to refer to Fig. 1, S5, the temperature and pressure are controlled to make supercritical carbon dioxide gradually precipitate from the low viscosity plastic-like mixture, while the plastic-like material in the low viscosity plastic-like mixture gradually deposits and solidifies into a shape in the annular cavity 15; in this process, the low viscosity plastic-like mixture in the compensation cavity is used to supplement the part of the low viscosity plastic-like mixture in the annular cavity 15 which is reduced in volume due to the precipitation of supercritical carbon dioxide;

[0110] In one embodiment of the present application, S5 comprises:

[0111] S5.1, the temperature of the high-pressure reactor is controlled at 45-55°C for 30 minutes;

[0112] S5.2, the pressure in the high-pressure reactor is slowly reduced at a rate of 0.5-1 bar / min to make supercritical carbon dioxide gradually precipitate from the low viscosity plastic-like mixture;

[0113] S5.3, the temperature of the high-pressure reactor is gradually increased to 60-70°C at a rate of 0.5°C / min and maintained for 60 minutes;

[0114] S5.4, the pressure in the high-pressure reactor is continuously reduced, and the reduction rate is slowed down to 0.3-0.5 bar / min;

[0115] S5.5, the temperature of the high-pressure reactor is increased to 70-80°C and maintained for 90 minutes;

[0116] S5.6, the pressure in the high-pressure reactor is slowly reduced to atmospheric pressure at a rate of 0.1-0.2 bar / min;

[0117] S5.7, the pressure change in the annular cavity 15 is monitored by the pressure sensor arranged in the high-pressure reactor, to ensure that the low viscosity plastic-like mixture in the compensation cavity can naturally flow into the annular cavity 15 to supplement the volume reduction caused by the precipitation of supercritical carbon dioxide, until the plastic-like material in the annular cavity 15 is completely solidified.

[0118] Specifically, controlling the solidification process of the plastic-like material is a key link to ensure product quality. This process begins with precisely controlling the temperature of the high-pressure reactor in the range of 45-55°C, and maintaining this temperature for 30 minutes. This initial temperature range is carefully selected, which is higher than the glass transition temperature of the epoxy resin system, but lower than the rapid solidification temperature, creating ideal starting conditions for the subsequent slow solidification process. Within these 30 minutes, the molecules in the low viscosity plastic-like mixture begin to move and arrange slowly, preparing for the subsequent crosslinking reaction.

[0119] Next, the pressure inside the high-pressure reactor is slowly decreased at a rate of 0.5-1 bar / min. This carefully controlled decompression process enables the supercritical carbon dioxide dissolved in the low-viscosity plastic-like mixture to gradually precipitate. The slow decrease of pressure is crucial to control the precipitation rate of carbon dioxide, as too fast precipitation can lead to the formation of a large number of tiny bubbles in the material, affecting the mechanical properties and appearance quality of the product. For example, for a system with an initial pressure of 120 bar, it takes 2-4 hours to complete this decompression process, which provides a sufficient time window for the initial solidification of the material.

[0120] As the pressure decreases, the temperature inside the high-pressure reactor is gradually increased at a rate of 0.5°C / min to 60-70°C and maintained in this temperature range for 60 minutes. This temperature ramping process and the setting of the holding time are determined based on the curing kinetics characteristics of the epoxy resin system. The slow ramping rate ensures the uniformity of the temperature distribution throughout the annular chamber 15, avoiding stress concentration caused by local overheating. At this stage, the cross-linking reactions between epoxy resin molecules start to accelerate, the network structure gradually forms, and the strength and modulus of the material start to significantly increase.

[0121] After the 60-minute holding period, the pressure inside the high-pressure reactor continues to decrease, but the decreasing rate (the rate at which the pressure inside the high-pressure reactor is decreased) is slowed down to 0.3-0.5 bar / min. This slower decompression rate matches the increasing degree of material solidification, which effectively prevents the formation of defects caused by the rapid precipitation of carbon dioxide in the case of a significant increase in material viscosity. At the same time, the temperature inside the high-pressure reactor is further increased to 70-80°C and maintained in this temperature range for 90 minutes. This higher temperature promotes the complete cross-linking between epoxy resin molecules, ensuring that the material reaches the desired mechanical properties and thermal stability.

[0122] In the final stage of the entire curing process, the pressure inside the high-pressure reactor is slowly decreased to atmospheric pressure at a rate of 0.1-0.2 bar / min. This extremely slow decompression process gives the material sufficient time to adapt to the pressure change, minimizing the accumulation of internal stress. At the same time, the pressure change in the annular chamber 15 is continuously monitored through a high-precision pressure sensor installed inside the high-pressure reactor. This real-time monitoring is crucial to ensure that the low-viscosity plastic-like mixture in the compensation chamber can naturally flow into the annular chamber 15, compensating for the volume reduction caused by the precipitation of supercritical carbon dioxide until the plastic-like material in the annular chamber 15 is completely solidified.

[0123] This precisely controlled solidification process has several significant advantages. First, by precisely controlling the temperature and pressure, uniform solidification of the plastic material is achieved, avoiding the problems of local overheating or incomplete solidification that are common in traditional processes. Second, the slow pressure release process effectively prevents the formation and growth of air bubbles, significantly improving the internal quality and surface finish of the product. Third, the design of the compensation chamber and the pressure monitoring system ensures that the material is replenished in a timely manner during the material shrinkage process, minimizing shrinkage stress and warping deformation.

[0124] For example, for a smart ring with a diameter of 20 mm, the entire solidification process may last 6-8 hours. Although this time is relatively long, it ensures the high quality and consistency of the product. During this process, the pressure in the annular chamber 15 may gradually decrease from the initial 120 bar to atmospheric pressure, while the temperature increases from 45°C to about 75°C at the end. Through this carefully designed temperature and pressure curve, the dimensional accuracy of the final product can be controlled within ±0.02 mm, and the surface roughness can reach Ra 0.4 μm or better, far exceeding the level of traditional injection molding processes.

[0125] Please continue to refer to Figure 1, S6, after the plastic material in the annular chamber 15 is completely solidified, the annular element 1 is removed from the mold, cooled to room temperature and packaged.

[0126] Specifically, first, the high-pressure reactor is slowly cooled to near room temperature, which usually takes 2-3 hours to ensure that the annular element 1 does not generate stress due to rapid temperature changes. Subsequently, the high-pressure reactor is carefully opened and the mold is removed. Next, the male and female molds of the mold are slowly separated by precise mechanical devices such as hydraulic or pneumatic systems to avoid any damage to the annular element 1.

[0127] After the annular element 1 is removed from the mold, the plastic material remaining in the injection port 16 is carefully cleaned. This cleaning process usually uses precise cutting tools or laser trimming equipment to ensure the accuracy of the cleaning and the smoothness of the surface. For example, for a smart ring with a diameter of 20 mm, the cleaning accuracy of the injection port 16 residue usually needs to be controlled within 0.05 mm to ensure the sealing of the subsequent packaging.

[0128] After cleaning, the annular element 1 is placed in a constant temperature oven with a temperature control precision of ±0.5°C for slow cooling until it reaches room temperature. This slow cooling process usually takes 1-2 hours to further release internal stress and improve the dimensional stability of the product. After cooling, a high-precision three-coordinate measuring instrument is used to detect the annular element 1 to ensure that its size and shape meet the design requirements.

[0129] Finally, the packaging process is carried out, and the carefully designed face cover 14 is placed at the injection port 16. The bottom of the face cover 14 precisely abuts the inner annular abutting wall 123 and the outer annular abutting wall 132. This design not only ensures the beauty of the packaging, but also improves the sealing effect. At the connection between the face cover 14 and the annular element 1, glue is used for sealing.

[0130] Another embodiment of the present application also provides a smart ring made by the production process of the annular wearable provided by the above-mentioned embodiments. FIG. 2 is a cross-sectional schematic view of an embodiment of a smart ring.

[0131] The smart ring includes:

[0132] The annular element 1 includes an outer annular shell 11, an inner annular shell 12, a bezel 13, and a face cover 14. The outer annular shell 11 and the inner annular shell 12 are oppositely arranged. The bottom periphery of the outer annular shell 11 is connected to the bottom periphery of the inner annular shell 12. The top periphery of the outer annular shell 11 is connected to the bezel 13. The outer annular shell 11, the inner annular shell 12, and the bezel 13 jointly define an annular cavity 15. An injection port 16 communicating with the annular cavity 15 is formed between the top peripheries of the bezel 13 and the inner annular shell 12. The face cover 14 is arranged on the injection port 16.

[0133] The electronic element 2 is arranged in the annular cavity 15.

[0134] The filler 3 is formed by solidification of a plastic material. The filler 3 fills the annular cavity 15.

[0135] Specifically, the smart ring is formed by a combination of multiple structures, which allows for more flexible material selection and more precise manufacturing processes. Compared with a ring with an integrated solid structure, the smart ring of the present application has significantly improved material compatibility. The outer ring shell 11 is made of precious metal to improve the appearance and durability, and the inner ring shell 12 is made of plastic to optimize the working environment of the electronic element 2. Secondly, the manufacturing flexibility is greatly enhanced, and each component can be manufactured and optimized separately. At the same time, the split structure makes it easier to repair or upgrade when needed without replacing the entire ring. In addition, this design provides more possibilities for personalized customization, and users can more easily replace the outer ring shell 11 made of different materials or colors.

[0136] In summary, this design takes into account functionality, reliability, and aesthetics, providing more possibilities for mass production and personalized customization of smart rings, enabling smart rings to achieve higher levels in terms of performance, appearance, and user experience.

[0137] In a specific implementation, the inner ring-shaped shell 12 is made of plastic or titanium. The outer ring-shaped shell 11 is made of at least one of titanium, gold, K gold, sterling silver, or jade. The face ring 13 is made of at least one of titanium, gold, K gold, sterling silver, or jade. The face cover 14 is made of at least one of titanium, gold, K gold, sterling silver, or jade.

[0138] Optionally, the electronic component 2 includes a circuit board 21 and a battery 22.

[0139] The circuit board 21 is electrically connected to the battery 22.

[0140] The circuit board 21 and the battery 22 are respectively arranged at two positions spaced 180 degrees along the circumference within the ring-shaped cavity 15, so as to balance the weight distribution of the smart ring.

[0141] Specifically, the circuit board 21 and the battery 22 are arranged at two opposite positions within the ring-shaped cavity 15, and the included angle between them is 180 degrees. This means that if the smart ring is placed flat and viewed from above, the circuit board 21 and the battery 22 will be located at the two ends of a diameter.

[0142] The purpose of this design mainly lies in the aspects of counterweight and wearing direction. First, from the perspective of counterweight, the circuit board 21 and the battery 22 are usually the two heaviest components inside the smart ring. Placing them at opposite positions can make the weight distribution more balanced, avoiding the discomfort caused by the over-weight of one side of the ring when worn. This balanced weight distribution can improve the wearing comfort, so that the user will not feel excessive pressure on one side of the finger when wearing for a long time.

[0143] Secondly, in terms of wearing direction, this design allows the user to wear the smart ring at any angle without affecting its functionality or comfort. Regardless of the rotation of the ring, the weight distribution remains balanced. This feature is particularly important because it eliminates the need for the user to consider a specific wearing direction, increasing the convenience of using the product.

[0144] Optionally, the inner ring-shaped shell 12 is provided with a charging interface 121, and the electronic component 2 includes a charging component 23 arranged within the ring-shaped cavity 15 and electrically connected to the battery 22 and the circuit board 21 respectively, and the charging component 23 is exposed through the charging interface 121. By arranging the charging interface 121 on the inner ring-shaped shell 12 instead of the outer ring-shaped shell 11, the charging function can be ensured without affecting the appearance design of the ring, so that the product remains beautiful and tidy in the non-charging state.

[0145] The charging component 23 is exposed through the charging interface 121, meaning that the user can directly connect the charging line to the charging interface 121 without disassembling or opening the ring for charging. This design greatly improves the daily use convenience of the product, and the user can easily charge the smart ring without complex operation.

[0146] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or direct / indirect application in other related technical fields within the inventive concept of the present application and the contents of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A production process of a ring-shaped wearable, characterized by, The method comprises the following steps: S1, providing a ring-shaped element and a mold, wherein a ring-shaped cavity is formed in the ring-shaped element, an injection port is arranged on the ring-shaped element and communicates with the ring-shaped cavity, the mold is provided with a cavity matched with the ring-shaped element, and a compensation cavity communicating with the cavity is arranged in the mold; S2, placing the ring-shaped element in the cavity, wherein the outer wall surface of the ring-shaped element is fitted with the inner wall surface of the cavity, and the ring-shaped cavity communicates with the compensation cavity through the injection port; S3, injecting supercritical carbon dioxide into the ring-shaped cavity and the compensation cavity to replace all air in the ring-shaped cavity and the compensation cavity; S4, mixing the prepared plastic material with mixed supercritical carbon dioxide to form a low-viscosity plastic mixture; the low-viscosity plastic mixture is injected into the ring-shaped cavity and the compensation cavity, and the pressure is kept higher than the critical pressure of supercritical carbon dioxide during the injection process; S5, controlling the temperature and pressure to make the supercritical carbon dioxide gradually separate out from the low-viscosity plastic mixture, and at the same time, the plastic material in the low-viscosity plastic mixture gradually deposits and solidifies in the ring-shaped cavity to form a shape; in this process, the low-viscosity plastic mixture in the compensation cavity is used to supplement the part of the low-viscosity plastic mixture in the ring-shaped cavity which is reduced due to the separation of supercritical carbon dioxide; S6, after the plastic material in the ring-shaped cavity is completely solidified, the ring-shaped element is taken out of the mold, cooled to room temperature and packaged.

2. The production process of a ring-shaped wearable according to claim 1, characterized in that, The ring-shaped element comprises an outer ring-shaped wall and an inner ring-shaped wall arranged oppositely, and the injection port is formed between the outer ring-shaped wall and the inner ring-shaped wall; The mold comprises an annular outer side wall and an annular inner side wall arranged oppositely, and the compensation cavity and a fluid passage communicating with the compensation cavity are formed between the annular outer side wall and the annular inner side wall; The distance between the annular outer side wall and the annular inner side wall is smaller than the distance between the outer ring-shaped wall and the inner ring-shaped wall; wherein After the ring-shaped element is placed in the cavity, the inner wall surface of the annular outer side wall and the inner wall surface of the annular inner side wall are both located between the outer ring-shaped wall and the inner ring-shaped wall, and the low-viscosity plastic mixture flows into the compensation cavity through the fluid passage and flows into the ring-shaped cavity under the guidance of the inner wall surface of the annular outer side wall or the inner wall surface of the annular inner side wall.

3. The production process of a ring-shaped wearable according to claim 2, characterized in that, The outer ring-shaped wall is provided with an outer ring-shaped abutting wall, and the inner ring-shaped wall is provided with an inner ring-shaped abutting wall; wherein After the ring-shaped element is placed in the cavity, the annular outer side wall is moved and the end thereof abuts against the outer ring-shaped abutting wall, and the annular inner side wall is moved and the end thereof abuts against the inner ring-shaped abutting wall.

4. The production process of a ring-shaped wearable of claim 1, wherein, The S3 comprises: S3.1, placing the mold with the ring-shaped element in a high-pressure reaction kettle, wherein the high-pressure reaction kettle comprises an inlet valve and an exhaust valve; S3.2, sealing the high-pressure reaction kettle and adjusting the internal temperature of the high-pressure reaction kettle to 35-40℃; S3.3, open the exhaust valve, inject the supercritical carbon dioxide for displacement into the high-pressure reactor through the inlet valve, the initial injection pressure is 80-100 bar; S3.4, after 15-20 minutes of continuous injection of the supercritical carbon dioxide for displacement, close the exhaust valve and the inlet valve, and maintain the pressure of the high-pressure reactor.

5. The production process of a ring-shaped wearable according to claim 4, characterized in that, The S4 comprises: S4.1, mix the pre-prepared plastic material with the supercritical carbon dioxide for mixing in the high-pressure mixer for 5-10 minutes to form a low-viscosity plastic mixture; S4.2, control the temperature of the high-pressure mixer at 40-50℃, and maintain the pressure at 100-120 bar; S4.3, open the injection valve connected to the mold on the high-pressure reactor, inject the low-viscosity plastic mixture into the annular cavity and the compensation cavity, and control the injection rate at 0.1-0.5 ml / s; S4.4, during the injection process, maintain the pressure in the annular cavity and the compensation cavity at 110-130 bar; S4.5, after the injection is completed, close the injection valve to ensure that the low-viscosity plastic mixture fills the annular cavity and the compensation cavity.

6. The production process of a ring-shaped wearable according to claim 5, characterized in that, The S5 comprises: S5.1, control the temperature of the high-pressure reactor at 45-55℃ for 30 minutes; S5.2, slowly reduce the pressure in the high-pressure reactor at a rate of 0.5-1 bar / min to gradually precipitate the supercritical carbon dioxide from the low-viscosity plastic mixture; S5.3, gradually increase the temperature of the high-pressure reactor to 60-70℃ at a rate of 0.5℃ / min, and maintain for 60 minutes; S5.4, continue to reduce the pressure in the high-pressure reactor at a reduced rate of 0.3-0.5 bar / min; S5.5, increase the temperature of the high-pressure reactor to 70-80℃, and maintain for 90 minutes; S5.6, slowly reduce the pressure in the high-pressure reactor to atmospheric pressure at a rate of 0.1-0.2 bar / min; S5.7, monitor the pressure change in the annular cavity through the pressure sensor arranged in the high-pressure reactor, to ensure that the low-viscosity plastic mixture in the compensation cavity can naturally flow into the annular cavity to compensate for the volume reduction caused by the precipitation of supercritical carbon dioxide, until the plastic material in the annular cavity is completely solidified.

7. A smart ring, characterized by The intelligent ring is made by the production process of the annular wearable device according to any one of claims 1 to 6, and the intelligent ring comprises: A ring-shaped element (1) comprises an outer ring-shaped shell (11), an inner ring-shaped shell (12), a face ring (13) and a face cover (14), the outer ring-shaped shell (11) and the inner ring-shaped shell (12) are oppositely arranged, the bottom periphery of the outer ring-shaped shell (11) is connected with the bottom periphery of the inner ring-shaped shell (12), the top periphery of the outer ring-shaped shell (11) is connected with the face ring (13), the outer ring-shaped shell (11), the inner ring-shaped shell (12) and the face ring (13) jointly define a ring-shaped cavity (15), an injection port (16) in communication with the ring-shaped cavity (15) is formed between the top periphery of the face ring (13) and the inner ring-shaped shell (12), and the face cover (14) covers the injection port (16); An electronic element (2) is arranged in the ring-shaped cavity (15); A filler (3) is formed by solidification of a plastic material, and the filler (3) fills the ring-shaped cavity (15).

8. The smart ring of claim 7, wherein, The material of the inner ring-shaped shell (12) is plastic or titanium; and / or, The material of the outer ring-shaped shell (11) is at least one of titanium, gold, K gold, silver and jade; and / or, The material of the face ring (13) is at least one of titanium, gold, K gold, silver and jade; and / or, The material of the face cover (14) is at least one of titanium, gold, K gold, silver and jade.

9. The smart ring of claim 7, wherein, The electronic element (2) comprises a circuit board (21) and a battery (22); The circuit board (21) is electrically connected with the battery (22); The circuit board (21) and the battery (22) are respectively arranged at two positions along the circumference direction in the ring-shaped cavity (15) and are spaced 180 degrees apart, so that the weight of the smart ring is evenly distributed.

10. The smart ring of claim 9, wherein, A charging interface (121) is arranged on the inner ring-shaped shell (12), the electronic element (2) comprises a charging component (23) arranged in the ring-shaped cavity (15) and electrically connected with the battery (22) and the circuit board (21) respectively, and the charging component (23) is exposed through the charging interface (121).

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