Artificial feather and method for manufacturing the same, and artificial shuttlecock

Abstract

This application relates to an artificial badminton shuttlecock. It includes a shuttlecock head and several shafts inserted into the head. Each shaft has two identical feathers overlapping and connected at its end away from the head. The two feathers are located on opposite sides of the shaft and form a connection with the shaft. At least one reinforcing retaining ring is connected to the shaft between the feathers and the head. At least one reinforcing rib is distributed inside each feather, with the ribs arranged in a radial, biomimetic orientation along the geometric center of the feather. The feathers include one or both of symmetrical and asymmetrical shapes, with the symmetrical feathers having an area of ​​290-350 mm². 2 The asymmetric pinnae have an area of ​​350-500 mm². 2 The angle between the feathers and the end face of the shuttlecock is 60-75°, and the gap between adjacent feathers is 0.05-0.4mm. This results in a shuttlecock with stable flight and good durability.

Description

Technical Field

[0001] This application relates to a daily necessity – badminton shuttlecock, specifically to an artificial feather blade and its preparation method, and an artificial badminton shuttlecock. Background Technology

[0002] As a popular sport, the performance of badminton shuttlecocks directly affects the gaming experience and competitive results. Core performance requirements focus on flight stability, deformation recovery flexibility, and durability. Currently, badminton shuttlecocks are mainly divided into two categories: shuttlecocks made of natural feathers such as goose feathers, and shuttlecocks made of synthetic materials.

[0003] While natural feather shuttlecocks possess excellent aerodynamic properties and an ideal deformation recovery curve, providing a soft feel and stable flight trajectory, they also have significant drawbacks: the scarcity of natural feather resources leads to high production costs; their structural strength is limited, making them prone to breakage under high-intensity hits such as smashes, resulting in a short lifespan and making it difficult to meet the application needs of the general public for high-frequency, high-intensity use.

[0004] To overcome the shortcomings of natural feathers, artificial badminton shuttlecocks were developed. They are primarily made from low-density polyethylene, nylon, polyester, and other polymer materials, offering advantages such as low cost, good weather resistance, and stable production. However, existing artificial badminton shuttlecocks still suffer from unstable flight trajectories due to imbalances in material rigidity and flexibility, and insufficient airflow adaptation, resulting in a significant gap compared to natural feathers.

[0005] In summary, existing technologies cannot simultaneously achieve the advantages of low cost and high durability of synthetic badminton shuttlecocks with the core performance of natural feather shuttlecocks. There is an urgent need to develop a synthetic badminton shuttlecock with better force dispersion and precise airflow adaptation to solve the technical pain points of existing products, meet higher usage requirements, and promote the performance upgrade of synthetic badminton shuttlecocks and the development of the industry. Summary of the Invention

[0006] In order to provide a strong, balanced, and stable artificial badminton shuttlecock, this application provides an artificial feather blade and its preparation method, as well as an artificial badminton shuttlecock.

[0007] In a first aspect, this application provides an artificial feather, including an artificial feather body and artificial feather reinforcing ribs; The artificial feather body comprises the following raw materials in parts by weight: 80-120 parts of low-density polyethylene, 0.4-0.6 parts of crosslinking agent, 1-3 parts of lubricant, and 3-6 parts of toughening agent; the crosslinking agent includes dicumyl peroxide, the lubricant includes butyl stearate, and the toughening agent includes ethylene-vinyl acetate copolymer. The artificial feather reinforcement comprises the following raw materials in parts by weight: 40-60 parts of low-density polyethylene, 5-7 parts of composite foaming agent, 5-20 parts of chopped carbon fiber, 6-10 parts of SIS block copolymer, 4-7 parts of maleic anhydride-grafted low-density polyethylene, 2-4 parts of trisodium citrate, and 0.1-0.3 parts of antioxidant.

[0008] In the bulk material, LDPE imparts basic flexibility to the feathers; the crosslinking agent initiates the construction of a three-dimensional crosslinking network in LDPE, inhibiting molecular chain slippage, improving bulk rigidity and dimensional stability, and preventing permanent deformation under stress. Simultaneously, its branched structure can be embedded into the LDPE crosslinking network, enhancing toughness. In the reinforcing ribs, MAH-g-LDPE forms an interface with the carbon fiber surface through polar groups at one end, while the other end is compatible with the non-polar segments of LDPE, improving the interfacial compatibility between carbon fibers and LDPE and preventing carbon fiber agglomeration. The SIS block copolymer has a styrene (S)-isoprene (I)-styrene triblock structure. The hard segment styrene benzene ring conjugated structure provides rigid support, while the soft segment isoprene provides elastic recovery. Its molecular chains can form intermolecular entanglement with LDPE and MAH-g-LDPE to create a richer network structure, resulting in a more balanced strength and toughness in the feathers. Trisodium citrate contains sodium carboxylate groups, which can weakly interact with the decomposition products of the foaming agent, thus regulating the foaming rate. By adding it together with the composite foaming agent to the reinforcing ribs, it is possible that the composite foaming agent generates a certain flow and gas diffusion in the melt during the preparation process, forming cells distributed along the gradient of the reinforcing ribs in the feather body. The LDPE in the reinforcing ribs is constrained by carbon fibers and SIS, and its crystallinity is slightly higher than that of the body. Due to the presence of trisodium citrate, the cell density is lower, forming a structure of low crystallinity in the body and high crystallinity in the reinforcing ribs, and gradient cell distribution in the body and fewer cells in the reinforcing ribs. This structure better simulates the characteristics of the natural feather root being rigid and the tip being flexible, which better matches the requirement of rigidity and flexibility balance. The high-pressure airflow distribution of the feathers during flight is more reasonable, and the resulting shuttlecock exhibits better feel and flight stability. Antioxidants capture free radicals to prevent the oxidative degradation of LDPE and SIS segments, further extending the service life.

[0009] Preferably, the composite foaming agent comprises azodicarbonamide and p-toluenesulfonyl hydrazine in a mass ratio of 7:(2.5-3.5).

[0010] Azodicarbonamide contains azo groups and decomposes upon heating to produce gases such as nitrogen and carbon dioxide. It exhibits high gas production and foaming efficiency, enabling high foaming ratios. However, when used alone, its decomposition rate is relatively fast, easily leading to cell merging and collapse. OBSH, on the other hand, decomposes at a lower temperature, with a slower decomposition rate and more stable gas production. It also has excellent compatibility with polyethylene, forming fine and stable initial cell nuclei. However, when used alone, its foaming efficiency is relatively low. When the two are blended in the aforementioned ratio, OBSH decomposes before AC, forming a stable initial cell framework. Subsequently, AC decomposes extensively, expanding and filling the pores, ensuring foaming efficiency while preventing cell collapse, ultimately forming a uniform and dense closed-cell structure. Uniform cells reduce system rigidity, preventing excessive brittleness of the reinforcing ribs, while retaining the supporting role of carbon fibers, allowing the feathers to undergo elastic deformation rather than brittle fracture under stress. Furthermore, it allows for precise control of feather density, meeting badminton shuttlecock weight standards and reducing flight speed fluctuations.

[0011] Preferably, the mass ratio of the composite foaming agent to trisodium citrate is (1.5-2.5):1.

[0012] The formulation ensures complete decomposition of the foaming agent within the co-injection molding temperature range, resulting in uniform pore size, stable porosity, and high controllability of foaming. This avoids insufficient foaming leading to excessive rigidity and insufficient toughness, or excessive foaming leading to decreased strength, ensuring the blades are adapted to the impact of the shot and the deformation requirements of airflow.

[0013] Preferably, the melt index of low-density polyethylene in the artificial feather body is 0.8-3 g / 10 min (190℃, 2.16 kg), and the melt index of low-density polyethylene in the artificial feather reinforcing rib is 5-8 g / 10 min (190℃, 2.16 kg).

[0014] The bulk material has a slightly lower melt index and longer molecular chains, resulting in a denser three-dimensional network after cross-linking. This enhances the bulk's rigidity and structural stability while avoiding molding defects caused by poor flowability. The reinforcing ribs have a slightly higher melt index, shorter molecular chains, and lower molten viscosity, allowing for uniform dispersion of components such as chopped carbon fibers and foaming agents. They also adapt to the melt flow rate during co-injection molding, ensuring full fusion of the bulk and reinforcing rib interfaces and preventing delamination. The high rigidity of the bulk and the balanced flowability and rigidity of the reinforcing ribs create a gradient of mechanical properties, meeting the functional requirements of the feathers—"bulb bearing the load, reinforcing rib providing support"—and ensuring structural uniformity for elastic recovery and flight stability.

[0015] Preferably, the SIS block copolymers include SIS block copolymers 20 / 80 with an S / I block ratio of 20 / 80 and SIS block copolymers 25 / 75 with an S / I block ratio of 25 / 75, with a mass ratio of 1:(2-3).

[0016] The rigidity of SIS is determined by the styrene hard segments, while its elasticity is determined by the isoprene soft segments. A lower block ratio (S / I) results in a higher proportion of soft segments, leading to better elastic recovery but insufficient rigidity. Conversely, a higher block ratio results in a higher proportion of hard segments, leading to stronger rigidity but decreased elasticity. The molecular chains of the two types of SIS can intertwine, with the styrene hard segments forming physical cross-linking points and the isoprene soft segments forming an elastic network. This, along with the LDPE cross-linking network and carbon fibers, forms a multi-level synergistic system of "rigidity-elasticity-support." Simultaneously, the isoprene soft segments of SIS can form intermolecular forces with MAH-g-LDPE, improving component compatibility.

[0017] The styrene hard segment of SIS can also induce LDPE molecular chain crystallization. The combination of the two block ratios can ensure a uniform distribution of crystallinity in the reinforcing ribs, avoiding brittle concentration caused by excessive local crystallization. The combination of soft and hard segments allows the blade to quickly recover its original shape after impact, avoiding flight trajectory deviation caused by deformation lag. It balances elasticity and rigidity, avoiding brittle fracture caused by excessive rigidity and insufficient support caused by excessive elasticity, making it suitable for high-frequency impact.

[0018] Secondly, this application provides a method for preparing artificial feathers, comprising the following preparation steps: S1: Raw material pretreatment: Weigh and mix the raw materials of the artificial feather body and the artificial feather reinforcing rib according to their respective mass parts to obtain the body mixture and the reinforcing rib mixture; S2: Blending and granulation: The bulk mixture is melt-blended and granulated to obtain bulk particles; the reinforcing rib mixture is melt-blended and granulated to obtain reinforcing rib particles; S3: Co-injection molding: The main body particles and reinforcing rib particles are co-injected, demolded, dried, and trimmed to obtain artificial feathers.

[0019] The feather structure boasts strong overall integrity, with one-piece molding preventing interface separation. The feathers exhibit uniform overall mechanical properties, ensuring smooth stress transfer under load and enhancing the stability of stiffness-toughness balance and elastic recovery. Excellent performance consistency is achieved through pretreatment and blending granulation, ensuring uniform component dispersion and low deviation in the feathers' mechanical properties, providing a foundation for stable flight trajectories. High production feasibility is ensured, with the process adaptable to industrial mass production, avoiding cost increases caused by complex processes while reducing molding defects such as bubbles, material shortages, and delamination, thus improving product yield.

[0020] Preferably, the melt blending temperature of the bulk mixture is 160-180℃, the rotation speed is 250-300r / min, the melt blending temperature of the reinforcing rib mixture is 70-190℃, the rotation speed is 280-320r / min, the injection pressure is 70-90MPa, the holding pressure is 30-40MPa, the holding time is 15-20s, and the cooling time is 30-40s.

[0021] Preferably, the temperature of the reinforcing ribs is slightly higher than that of the bulk material. This improves the fluidity of LDPE, promotes the interfacial reaction between carbon fibers and MAH-g-LDPE, and facilitates the initial activation of the foaming agent, preventing cell defects caused by premature decomposition of the foaming agent. Higher rotation speed breaks up carbon fiber agglomerates, ensuring uniform dispersion. Under appropriate injection pressure, the molten material fills the mold, especially small structures such as the tips of the flakes, preventing material shortages. Under appropriate holding pressure, the molten material's cooling shrinkage is compensated for, while simultaneously promoting the slow diffusion of some of the foaming agent from the reinforcing ribs into the bulk material, forming a gradient cell structure and further optimizing the stiffness-toughness gradient.

[0022] Thirdly, this application provides an artificial badminton shuttlecock, comprising a shuttlecock head and a plurality of shuttlecock shafts inserted into the shuttlecock head. Each shuttlecock shaft has two identical feathers overlapping at its end away from the shuttlecock head. Both identical feathers comprise the artificial feathers described in any one of claims 1-5, and / or the two identical feathers are prepared using the artificial feather preparation method described in claim 6. The two identical feathers are located on opposite sides of the shuttlecock shaft and are bonded to the shaft to form a connecting portion. At least one reinforcing retaining ring is also connected to the shuttlecock shaft between the feathers and the shuttlecock head. Each feather has at least one reinforcing rib inside, and the reinforcing ribs are distributed radially in a biomimetic orientation along the geometric center of the feather. The shuttlecock shaft gradually tapers from the end near the shuttlecock head to the end of the feather. The feathers include one or both of symmetrical and asymmetrical feathers, and the symmetrical feathers have an area of ​​290-350 mm². 2 The asymmetric pinnae have an area of ​​350-500 mm². 2 The angle between the connection formed by the two identical feathers bonded to the club and the end face of the club head is in the range of 60-75°, and the gap between adjacent feathers is 0.05-0.4mm.

[0023] The overlapping and symmetrically distributed double vanes on both sides of the club optimize force distribution, dispersing the instantaneous impact force during impact and preventing tearing caused by excessive force on a single vane. The bonded connection ensures the interfacial strength between the vanes and the club, while the reinforced retaining ring further constrains the club, preventing bending or vane detachment and improving overall structural stability. The radially distributed, biomimetic reinforcing ribs mimic the support structure of a natural feather's shaft and barb, evenly distributing the impact force across the vanes to avoid localized stress concentration and enhancing their bending resistance, ensuring consistent elastic recovery after impact. The defined vane area, angle with the clubhead, and adjacent gaps ensure a uniform airflow channel among the 16 vanes, preventing airflow turbulence. Matched angles and gaps stabilize the air resistance coefficient, reducing "float" or "sudden drop" phenomena. Consistent vane size limits the overall center of gravity, preventing shifts in the ball's center of gravity and ensuring even force distribution and a stable trajectory during flight. The uniform airflow channels and center of gravity distribution minimize drag fluctuations and trajectory deviations during shuttlecock flight, making it more suitable for competition and training needs. The double blades and reinforced binding rings work together to disperse impact, preventing blades from falling out or tearing. The radial reinforcing ribs, combined with the one-piece molded blades, resist torsional deformation during impact, ensuring the blades remain evenly aligned and show no significant deformation even after long-term use.

[0024] Preferably, the vane is an asymmetrical vane, extending from the club joint to the end away from the club, and is wing-shaped overall; the width of the vane is asymmetrically and gradually distributed along the longitudinal direction; the first side edge of the vane is a smooth, outwardly convex arc-shaped profile extending upward from the club joint, and the radius of curvature of this arc-shaped profile gradually increases and then decreases from bottom to top along the longitudinal direction, so that the degree of convexity of the first side edge gradually increases and then decreases with the increase of longitudinal height; the second side edge of the vane body is a composite arc-shaped profile extending upward from the club joint, including a convex section, a gently concave section and a narrowing section connected in sequence, and the geometric center of the vane body is offset to one side relative to the central axis of the club joint, with the offset direction pointing to the side where the first side edge of the vane body is located.

[0025] The asymmetrical profile adapts to the rotating airflow during badminton flight. The first side's convex arc (with a gradually changing radius of curvature) reduces airflow separation and lowers vortex drag. The second side's composite arc guides the airflow smoothly, preventing pressure imbalances caused by excessively high local airflow velocities, thus reducing feather flutter. Geometric center offset ensures the feather's center of gravity coincides with the center of force, preventing rotational turbulence caused by eccentricity and adapting to the centrifugal force during flight, ensuring trajectory stability. The pointed end near the shaft reduces stress concentration at the connection point, and combined with the radial distribution of reinforcing ribs, allows for rapid stress transfer to the shaft. The smooth transition at the distal end enhances flexibility, adapting to airflow deformation and achieving a gradient mechanical performance of "rigid at the tip, flexible at the distal end," optimizing elastic recovery. The curvature variation of the arc profile ensures uniform deformation of the feather under force, preventing permanent deformation caused by excessive local deformation and improving the consistency of aerodynamic performance. The gradient mechanical structure allows the blades to adapt to airflow at different speeds, and they rebound quickly after deformation. The asymmetrical structure can match the direction of force when hitting the ball, reducing hitting deviation and improving the user experience.

[0026] Preferably, the feather is an asymmetrical feather with pores and zero to several through holes. The through holes include one or more of small circular through holes and large elongated through holes. The small circular through holes have a diameter of 1-3 mm, and the large elongated through holes have a length of 15-70 mm and a width of 1-3 mm. The pores are distributed in a gradient from the direction of trisodium citrate diffusion within the reinforcing rib to the direction away from the reinforcing rib.

[0027] Near the reinforcing ribs, the dense foam cells, constrained by carbon fiber, limit foaming and provide rigid support. Further away from the ribs, the looser, fully foamed cells provide flexibility and elasticity, forming a dense-sparse gradient foam structure that further enhances the balance between rigidity and toughness. The gas within the foam cells absorbs impact energy, improving elastic recovery while reducing feather density to fit weight standards. Small, round through-holes regulate local airflow velocity, preventing airflow buildup on the feather surface and reducing pressure differences. Large, elongated through-holes guide airflow through the feathers, reducing air resistance and mimicking the breathability of natural feathers for more uniform airflow. The limited through-hole size prevents excessive airflow leading to insufficient drag and excessive flight speed, or insufficient airflow causing drag fluctuations and trajectory deviations, ensuring stable airflow. The gradient foam cells and through-holes work together to ensure stable airflow, further reducing drag fluctuations, minimizing shuttlecock flight speed deviations, and resulting in excellent trajectory consistency. The gradient foam cells, along with the reinforcing ribs and SIS (Self-Strain Interval), balance rigid support and flexible deformation, resisting impact while adapting to airflow changes, thus improving overall performance.

[0028] In summary, this application has the following beneficial effects: 1. Strength and balance This application achieves a balance between rigidity and flexibility through the combination of components, structure, and process. In terms of components, LDPE crosslinking enhances rigidity, EVA and SIS soft segments enhance toughness, carbon fiber provides reinforcement, and MAH-g-LDPE optimizes compatibility, forming a rich interwoven crosslinking system that combines rigidity and flexibility. In terms of structure, the gradient crystallization of the bulk and reinforcing ribs, the gradient distribution of pores, and the gradient mechanical properties of the asymmetric contours simulate the gradual change in rigidity and flexibility of natural feathers. In terms of process, the appropriate melt index and molding parameters ensure uniform component dispersion and tight interface fusion, avoiding stress concentration, ultimately achieving a balance between "sufficient rigidity for impact resistance and sufficient flexibility to adapt to deformation".

[0029] 2. Good elastic recovery At the molecular level, the soft isoprene segments of the SIS block copolymer can rebound rapidly, the LDPE crosslinking network restricts permanent deformation, and MAH-g-LDPE ensures smooth interfacial stress transmission, avoiding elastic loss caused by component separation. At the structural level, the gradient pores can absorb and release impact energy quickly, and the radial reinforcing ribs guide uniform deformation recovery. At the process level, slow cooling and full crosslinking make crystallization uniform, reduce internal stress, avoid deformation lag, and ultimately achieve excellent elastic recovery.

[0030] 3. Stable flight trajectory Precise control of the size, angle, and weight of the feathers prevents center of gravity shift and ensures uniform feather arrangement; the asymmetrical profile, gradient bubble holes, and through holes work together to stabilize the air resistance coefficient and reduce airflow turbulence and feather flutter; the one-piece molded feathers, double feather connection, and reinforced ferrule work together to resist the impact of hitting the ball and torsional deformation, maintain stable flight attitude over a long period of time, and ultimately achieve a precise flight trajectory. Attached Figure Description

[0031] Figure 1 This is a structural diagram of a symmetrical artificial feather of the present invention, and a diagram showing the distribution of internal reinforcing ribs; Figure 2 A structural diagram of an asymmetric artificial feather and a diagram showing the distribution of internal reinforcing ribs according to the present invention; Figure 3 The feather structure and distribution of the artificial badminton shuttlecock prepared in Example 2-1 of the present invention are shown. Detailed Implementation

[0032] To further aid in understanding the technical solution of this invention, several specific implementation examples are provided below to describe the technical solution of this invention in more detail. All of these described embodiments are only some embodiments of this invention, and not all of them. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments; and the reaction devices, monomer compounds, etc. involved in the following embodiments are all commercially available.

[0033] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0034] The following examples are further illustrations of the present invention, but the present invention is not limited thereto.

[0035] The 20 / 80 S / I block ratio SIS block copolymer was purchased from Tangyi Baling Petrochemical 1188; the 25 / 75 S / I block ratio SIS block copolymer was purchased from Tangyi Baling Petrochemical 1225; the 7 g / 10 min melt flow index low-density polyethylene was purchased from Zhenhai Refining & Chemical M577-S (HSGC7260); the 0.9 g / 10 min melt flow index low-density polyethylene was purchased from Yanshan Petrochemical 1I2A-1; the ethylene-vinyl acetate copolymer was purchased from Sinopec Yanshan EVA 18J3; and the short-cut carbon fiber was purchased from Shanghai Lishuo Composite Materials Technology Co., Ltd. Lishuo WD-300.

[0036] Artificial Feather Examples Example 1-1 Raw material composition (parts by weight): Body: 82 parts of low-density polyethylene (melt index 0.9g / 10min, 190℃, 2.16kg), 0.6 parts of dicumyl peroxide, 2 parts of butyl stearate, and 5 parts of ethylene-vinyl acetate copolymer.

[0037] Reinforcing ribs: 50 parts low-density polyethylene (melt index 7g / 10min, 190℃, 2.16kg), 3.5 parts azodicarbonamide, 1.5 parts p-toluenesulfonyl hydrazine, 12 parts chopped carbon fiber, 3 parts S / I block ratio 20 / 80 SIS block copolymer, 6 parts S / I block ratio 25 / 75 SIS block copolymer, 5 parts MAH-g-LDPE, 2.5 parts trisodium citrate, 0.2 parts antioxidant 1010, and 0.1 parts antioxidant 168.

[0038] Preparation process: S1. Prepare the bulk mixture and the reinforcing rib mixture separately. Both are stirred using a high-speed mixer at a speed of 800 r / min, a temperature of 80℃, and a stirring time of 15 min. After stirring, let them stand and cool to room temperature for later use. When preparing the reinforcing rib mixture, premix the short-cut carbon fibers with MAH-g-LDPE for 3 min before adding the remaining components to complete the overall stirring, ensuring that the carbon fibers are evenly dispersed and initially interact with MAH-g-LDPE.

[0039] S2. A twin-screw extruder was used to granulate the bulk mixture and the reinforcing rib mixture separately. The temperatures of each section of the extruder were set as follows: feeding section 80℃, melting section 190℃, homogenization section 185℃, and die head temperature 185℃. The screw speed for the bulk mixture extrusion was 280 r / min, and the screw speed for the reinforcing rib mixture extrusion was 300 r / min. After extrusion, the mixture was cooled in a cooling water tank at 25℃, granulated by a pelletizer with a particle size of 3±0.5 mm, and dried in a dryer at 60℃ for 2 hours for later use.

[0040] S3. A dual-barrel injection molding machine is used, with 6 biomimetic oriented reinforcing ribs. The parameters of the main barrel and the reinforcing rib barrel are set separately: the main barrel feeding section is 90°C, the melting section is 190°C, and the homogenization section is 185°C; the reinforcing rib barrel feeding section is 95°C, the melting section is 190°C, and the homogenization section is 190°C. The nozzle temperature is 185°C. The injection pressure is 80MPa, the injection speed is 50mm / s, the holding pressure is 35MPa, the holding time is 18s, the mold temperature is 45°C, the clamping force is 1200kN, and the melt residence time is 20s. This allows the main body and the reinforcing ribs to be integrally molded to produce artificial feathers.

[0041] Examples 1-2 The only difference between this embodiment and Embodiment 1-1 is that: Raw material composition (parts by weight): Body: 82 parts of low-density polyethylene (melt index 0.9g / 10min, 190℃, 2.16kg), 0.6 parts of dicumyl peroxide, 2 parts of butyl stearate, and 5 parts of ethylene-vinyl acetate copolymer.

[0042] Reinforcing ribs: 50 parts low-density polyethylene (melt index 7g / 10min, 190℃, 2.16kg), 2.5 parts azodicarbonamide, 2.5 parts p-toluenesulfonyl hydrazine, 12 parts chopped carbon fiber, 3 parts S / I block ratio 20 / 80 SIS block copolymer, 6 parts S / I block ratio 25 / 75 SIS block copolymer, 5 parts MAH-g-LDPE, 2.5 parts trisodium citrate, 0.2 parts antioxidant 1010, and 0.1 parts antioxidant 168.

[0043] Examples 1-3 The only difference between this embodiment and Embodiment 1-1 is that: Raw material composition (parts by weight): Main body: 82 parts of low-density polyethylene (melt index 2g / 10min, 190℃, 2.16kg), 0.6 parts of dicumyl peroxide, 2 parts of butyl stearate, and 5 parts of ethylene-vinyl acetate copolymer.

[0044] Reinforcing ribs: 50 parts low-density polyethylene (melt index 7g / 10min, 190℃, 2.16kg), 5 parts azodicarbonamide, 12 parts chopped carbon fiber, 3 parts S / I block ratio 20 / 80 SIS block copolymer, 6 parts S / I block ratio 25 / 75 SIS block copolymer, 5 parts MAH-g-LDPE, 2.5 parts trisodium citrate, 0.2 parts antioxidant 1010, and 0.1 parts antioxidant 168.

[0045] Examples 1-4 The only difference between this embodiment and Embodiment 1-1 is that: Raw material composition (parts by weight): Main body: 82 parts of low-density polyethylene (melt index 2g / 10min, 190℃, 2.16kg), 0.6 parts of dicumyl peroxide, 2 parts of butyl stearate, and 5 parts of ethylene-vinyl acetate copolymer.

[0046] Reinforcing ribs: 50 parts low-density polyethylene (melt index 2g / 10min, 190℃, 2.16kg), 3.5 parts azodicarbonamide, 1.5 parts p-toluenesulfonyl hydrazine, 12 parts chopped carbon fiber, 3 parts S / I block ratio 20 / 80 SIS block copolymer, 6 parts S / I block ratio 25 / 75 SIS block copolymer, 5 parts MAH-g-LDPE, 2.5 parts trisodium citrate, 0.2 parts antioxidant 1010, and 0.1 parts antioxidant 168.

[0047] Examples 1-5 The only difference between this embodiment and Embodiment 1-1 is that: Raw material composition (parts by weight): Main body: 82 parts of low-density polyethylene (melt index 2g / 10min, 190℃, 2.16kg), 0.6 parts of dicumyl peroxide, 2 parts of butyl stearate, and 5 parts of ethylene-vinyl acetate copolymer.

[0048] Reinforcing ribs: 50 parts low-density polyethylene (melt index 7g / 10min, 190℃, 2.16kg), 3.5 parts azodicarbonamide, 1.5 parts p-toluenesulfonyl hydrazine, 12 parts chopped carbon fiber, 4.5 parts S / I block ratio 20 / 80 SIS block copolymer, 4.5 parts S / I block ratio 25 / 75 SIS block copolymer, 5 parts MAH-g-LDPE, 2.5 parts trisodium citrate, 0.2 parts antioxidant 1010, and 0.1 parts antioxidant 168.

[0049] Examples 1-6 The only difference between this embodiment and Embodiment 1-1 is that: Raw material composition (parts by weight): Main body: 82 parts of low-density polyethylene (melt index 2g / 10min, 190℃, 2.16kg), 0.6 parts of dicumyl peroxide, 2 parts of butyl stearate, and 5 parts of ethylene-vinyl acetate copolymer.

[0050] Reinforcing ribs: 50 parts low-density polyethylene (melt index 7g / 10min, 190℃, 2.16kg), 3.5 parts azodicarbonamide, 1.5 parts p-toluenesulfonyl hydrazine, 12 parts chopped carbon fiber, 6 parts S / I block ratio 20 / 80 SIS block copolymer, 5 parts MAH-g-LDPE, 2.5 parts trisodium citrate, 0.2 parts antioxidant 1010, and 0.1 parts antioxidant 168.

[0051] Examples 1-7 The only difference between this embodiment and Embodiment 1-1 is that: Preparation process: S1. Prepare the bulk mixture and the reinforcing rib mixture separately. Both are stirred using a high-speed mixer at a speed of 800 r / min, a temperature of 80℃, and a stirring time of 15 min. After stirring, let them stand and cool to room temperature for later use. The reinforcing rib mixture is prepared by pre-mixing short-cut carbon fibers with MAH-g-LDPE for 3 min before adding the remaining components to complete the overall stirring, ensuring that the carbon fibers are evenly dispersed and initially interact with MAH-g-LDPE.

[0052] S2. A twin-screw extruder was used to granulate the bulk mixture and the reinforcing rib mixture separately. The temperatures of each section of the extruder were set as follows: feeding section 80℃, melting section 190℃, homogenization section 185℃, and die head temperature 185℃. The screw speed for the bulk mixture extrusion was 280 r / min, and the screw speed for the reinforcing rib mixture extrusion was 300 r / min. After extrusion, the mixture was cooled in a cooling water tank at 25℃, granulated by a pelletizer with a particle size of 3±0.5 mm, and dried in a dryer at 60℃ for 2 hours for later use.

[0053] S3. A dual-barrel injection molding machine is used, with 6 biomimetic oriented reinforcing ribs. The parameters of the main barrel and the reinforcing rib barrel are set separately: the main barrel feeding section is 90°C, the melting section is 190°C, and the homogenization section is 185°C; the reinforcing rib barrel feeding section is 95°C, the melting section is 190°C, and the homogenization section is 190°C. The nozzle temperature is 185°C. The injection pressure is 80MPa, the injection speed is 50mm / s, the holding pressure is 20MPa, the holding time is 18s, the mold temperature is 45°C, the clamping force is 1200kN, and the melt residence time is 20s. This allows the main body and the reinforcing ribs to be integrally molded to produce artificial feathers.

[0054] Examples 1-8 The only difference between this embodiment and Embodiment 1-1 is that: Preparation process: S1. Prepare the bulk mixture and the reinforcing rib mixture separately. Both are stirred using a high-speed mixer at a speed of 800 r / min, a temperature of 80℃, and a stirring time of 15 min. After stirring, let them stand and cool to room temperature for later use. The reinforcing rib mixture requires pre-mixing the short-cut carbon fibers with MAH-g-LDPE for 3 min before adding the remaining components to complete the overall stirring, ensuring that the carbon fibers are evenly dispersed and initially interact with MAH-g-LDPE.

[0055] S2. A twin-screw extruder was used to granulate the bulk mixture and the reinforcing rib mixture separately. The temperatures of each section of the extruder were set as follows: feeding section 80℃, melting section 190℃, homogenization section 185℃, and die head temperature 185℃. The screw speed for the bulk mixture extrusion was 280 r / min, and the screw speed for the reinforcing rib mixture extrusion was 300 r / min. After extrusion, the mixture was cooled in a cooling water tank at 25℃, granulated by a pelletizer with a particle size of 3±0.5 mm, and dried in a dryer at 60℃ for 2 hours for later use.

[0056] S3. A dual-barrel injection molding machine is used, with 6 biomimetic oriented reinforcing ribs. The parameters of the main barrel and the reinforcing rib barrel are set separately: the main barrel feeding section is 90°C, the melting section is 190°C, and the homogenization section is 185°C; the reinforcing rib barrel feeding section is 95°C, the melting section is 190°C, and the homogenization section is 190°C. The nozzle temperature is 185°C. The injection pressure is 80MPa, the injection speed is 50mm / s, the holding pressure is 50MPa, the holding time is 18s, the mold temperature is 45°C, the clamping force is 1200kN, and the melt residence time is 20s. This allows the main body and the reinforcing ribs to be integrally molded to produce artificial feathers.

[0057] badminton shuttlecock example Example 2-1 The artificial feathers prepared in Example 1-1 were placed in a drying oven and dried at 55°C for 30 minutes. The burrs on the edges of the feathers were precisely trimmed, and after trimming, they were allowed to cool to room temperature again. Then, the 32 feathers were assembled in pairs with the shuttlecock head and the shuttlecock shaft. The end of the shuttlecock shaft was connected to the double feathers by overlapping. The adhesive was EVA hot melt adhesive, the bonding temperature was 120°C, the bonding pressure was 0.3MPa, and the bonding time was 10s. A reinforcing fixing ring was then fitted to complete the overall preparation of the badminton shuttlecock.

[0058] Structural parameters: The feathers are asymmetrical long wings. The first side edge is a smooth, outwardly convex arc (the radius of curvature increases first and then decreases). The second side edge is a composite arc of an outwardly convex section, a gently concave section, and a narrowing section. The geometric center is offset towards the first side. The feathers contain gradient-distributed bubbles and through holes. On the first side, there is a small circular through hole close to the ball head and a large elongated through hole away from the ball head. The small circular through hole has a diameter of 2mm, the large elongated through hole has a length of 40mm, and a width of 2mm. The 16 feathers are evenly arranged, with an angle of 68° to the ball head. The gap between adjacent feathers is 0.2mm. The ends of the club are connected by overlapping double feathers, and a reinforcing fixing ring is added.

[0059] Example 2-2 The only difference between this embodiment and embodiment 2-1 is that the artificial feathers are the artificial feathers obtained in embodiment 1-2.

[0060] Example 2-3 The only difference between this embodiment and embodiment 2-1 is that the artificial feathers are artificial feathers prepared in embodiment 1-3.

[0061] Examples 2-4 The only difference between this embodiment and embodiment 2-1 is that the artificial feathers are artificial feathers prepared in embodiment 1-4.

[0062] Examples 2-5 The only difference between this embodiment and embodiment 2-1 is that the artificial feathers are artificial feathers prepared in embodiment 1-5.

[0063] Examples 2-6 The only difference between this embodiment and Embodiment 2-1 is that the artificial feathers are the artificial feathers obtained in Embodiments 1-6.

[0064] Examples 2-7 The only difference between this embodiment and Embodiment 2-1 is that the artificial feathers are the artificial feathers obtained in Embodiments 1-7.

[0065] Examples 2-8 The only difference between this embodiment and embodiment 2-1 is that the artificial feathers are artificial feathers prepared in embodiment 1-8.

[0066] Artificial feather comparison Comparative Example 1-1 Raw material composition (parts by weight): Main body: 82 parts of low-density polyethylene (melt index 2g / 10min, 190℃, 2.16kg), 0.6 parts of dicumyl peroxide, 2 parts of butyl stearate, and 5 parts of ethylene-vinyl acetate copolymer.

[0067] Reinforcing ribs: 50 parts of low-density polyethylene (melt index 7g / 10min, 190℃, 2.16kg), 3.5 parts of azodicarbonamide, 1.5 parts of p-toluenesulfonyl hydrazine, 12 parts of chopped carbon fiber, 3 parts of SIS block copolymer with S / I block ratio of 20 / 80, 6 parts of SIS block copolymer with S / I block ratio of 25 / 75, 5 parts of MAH-g-LDPE, 0.2 parts of antioxidant 1010, and 0.1 parts of antioxidant 168.

[0068] Preparation process: S1. Prepare the bulk mixture and the reinforcing rib mixture separately. Both are stirred using a high-speed mixer at a speed of 800 r / min, a temperature of 80℃, and a stirring time of 15 min. After stirring, let them stand and cool to room temperature for later use. The reinforcing rib mixture requires pre-mixing the short-cut carbon fibers with MAH-g-LDPE for 3 min before adding the remaining components to complete the overall stirring, ensuring that the carbon fibers are evenly dispersed and initially interact with MAH-g-LDPE.

[0069] S2. A twin-screw extruder was used to granulate the bulk mixture and the reinforcing rib mixture separately. The temperatures of each section of the extruder were set as follows: feeding section 80℃, melting section 190℃, homogenization section 185℃, and die head temperature 185℃. The screw speed for the bulk mixture extrusion was 280 r / min, and the screw speed for the reinforcing rib mixture extrusion was 300 r / min. After extrusion, the mixture was cooled in a cooling water tank at 25℃, granulated by a pelletizer with a particle size of 3±0.5 mm, and dried in a dryer at 60℃ for 2 hours for later use.

[0070] S3. A dual-barrel injection molding machine is used, with 6 biomimetic oriented reinforcing ribs. The parameters of the main barrel and the reinforcing rib barrel are set separately: the main barrel feeding section is 90°C, the melting section is 190°C, and the homogenization section is 185°C; the reinforcing rib barrel feeding section is 95°C, the melting section is 190°C, and the homogenization section is 190°C. The nozzle temperature is 185°C. The injection pressure is 80MPa, the injection speed is 50mm / s, the holding pressure is 35MPa, the holding time is 18s, the mold temperature is 45°C, the clamping force is 1200kN, and the melt residence time is 20s. This allows the main body and the reinforcing ribs to be integrally molded to produce artificial feathers.

[0071] Comparative Examples 1-2 Raw material composition (parts by weight): Main body: 82 parts of low-density polyethylene (melt index 2g / 10min, 190℃, 2.16kg), 0.6 parts of dicumyl peroxide, 2 parts of butyl stearate, and 5 parts of ethylene-vinyl acetate copolymer.

[0072] Reinforcing ribs: 59 parts of low-density polyethylene (melt index 7g / 10min, 190℃, 2.16kg), 3.5 parts of azodicarbonamide, 1.5 parts of p-toluenesulfonyl hydrazine, 12 parts of chopped carbon fiber, 5 parts of MAH-g-LDPE, 2.5 parts of trisodium citrate, 0.2 parts of antioxidant 1010, and 0.1 parts of antioxidant 168.

[0073] Preparation process: S1. Prepare the bulk mixture and the reinforcing rib mixture separately. Both are stirred using a high-speed mixer at a speed of 800 r / min, a temperature of 80℃, and a stirring time of 15 min. After stirring, let them stand and cool to room temperature for later use. The reinforcing rib mixture requires pre-mixing the short-cut carbon fibers with MAH-g-LDPE for 3 min before adding the remaining components to complete the overall stirring, ensuring that the carbon fibers are evenly dispersed and initially interact with MAH-g-LDPE.

[0074] S2. A twin-screw extruder was used to granulate the bulk mixture and the reinforcing rib mixture separately. The temperatures of each section of the extruder were set as follows: feeding section 80℃, melting section 190℃, homogenization section 185℃, and die head temperature 185℃. The screw speed for the bulk mixture extrusion was 280 r / min, and the screw speed for the reinforcing rib mixture extrusion was 300 r / min. After extrusion, the mixture was cooled in a cooling water tank at 25℃, granulated by a pelletizer with a particle size of 3±0.5 mm, and dried in a dryer at 60℃ for 2 hours for later use.

[0075] S3. A dual-barrel injection molding machine is used, with 6 biomimetic oriented reinforcing ribs. The parameters of the main barrel and the reinforcing rib barrel are set separately: the main barrel feeding section is 90°C, the melting section is 190°C, and the homogenization section is 185°C; the reinforcing rib barrel feeding section is 95°C, the melting section is 190°C, and the homogenization section is 190°C. The nozzle temperature is 185°C. The injection pressure is 80MPa, the injection speed is 50mm / s, the holding pressure is 35MPa, the holding time is 18s, the mold temperature is 45°C, the clamping force is 1200kN, and the melt residence time is 20s. This allows the main body and the reinforcing ribs to be integrally molded to produce artificial feathers.

[0076] Artificial shuttlecock comparison ratio Comparative Example 2-1 The only difference between this comparative example and Example 2-1 is that the artificial feathers are the same as those prepared in Comparative Example 1-1.

[0077] Comparative Example 2-2 The only difference between this comparative example and Example 2-1 is that the artificial feathers are artificial feathers prepared in Comparative Example 1-2.

[0078] Artificial feather performance testing methods 1. Interface bonding strength testing Referring to GB / T 2791, the feather was cut into 10mm wide specimens along the interface between the body and the reinforcing rib. Peel tests were performed using a universal testing machine at a tensile speed of 50mm / min. The maximum peel force was recorded, and the interfacial bond strength per unit width (MPa) was calculated.

[0079] 2. Elastic recovery rate test According to GB / T 18174, the feather sample is fixed in the fixture, a 10% tensile deformation is applied, and after holding for 30s, it is unloaded and left to stand for 60s. The residual deformation after unloading is measured. The elastic recovery rate is calculated as (initial deformation - residual deformation) / initial deformation × 100%.

[0080] 3. Bending fatigue cycles: The universal testing machine is set to a bending deformation of 0.5 mm and a frequency of 10 Hz until the blade breaks, and the number of cycles is recorded. The test results are shown in Table 1.

[0081] Table 1

[0082] Analysis of the reasons for performance differences 1. Effect of foaming agent ratio (Examples 1-1, 1-2, 1-3, Comparative Example 1-1) Example 1-1 uses a combination of azodicarbonamide and p-toluenesulfonyl hydrazine, resulting in uniform cell size and optimal elasticity and fatigue performance. Example 1-2 shows decreased foaming efficiency, larger cells, and reduced elastic recovery rate. Example 1-3 uses a single foaming rate without control, leading to cell collapse and decreased interfacial bonding strength. The core reason is that the disordered cell structure disrupts the fusion of the reinforcing ribs and the bulk molecular chains, hindering stress transmission.

[0083] Comparative Example 1-1 lacked trisodium citrate, resulting in poor foaming agent decomposition regulation, large deviation in cell size, decreased molecular chain toughness, embrittlement, and a lower elastic recovery rate compared to Example 1-1.

[0084] 2. Effect of LDPE melt index (Examples 1-1, 1-4) In Examples 1-4, the melt index of the reinforcing LDPE deviated from the limit, the molecular chain was too long, and the melt viscosity was too high. This may have caused poor gradient diffusion of the foaming agent, uneven dispersion of the short carbon fiber and MAH-g-LDPE, insufficient interfacial bonding between MAH-g-LDPE and carbon fiber, decreased interfacial bonding strength, and reduced bending fatigue cycles.

[0085] 3. Effect of SIS block copolymers (Examples 1-1, 1-5, 1-6, Comparative Examples 1-2) Example 1-1 uses two SISs together to form a rigid-elastic multi-level network. The soft segment isoprene improves the resilience, and the hard segment styrene supplements the rigidity. Example 1-5 has a slightly higher proportion of hard segments, resulting in a decrease in elastic recovery rate. Example 1-6 uses a single SIS (20 / 80), which lacks hard segment support, resulting in a decrease in the number of bending fatigue cycles. Comparative Example 1-2 completely lacks SIS, making it impossible to form an elastic network. The molecular chains are difficult to rebound after being stressed, and there is no soft segment buffer, resulting in obvious embrittlement.

[0086] 4. Effect of holding pressure (Examples 1-1, 1-7, 1-8) Example 1-1: The holding pressure can compensate for the shrinkage of the molten material, promote the gradient diffusion of the foaming agent, and form uniform cells. Example 1-7: If the holding pressure is too low, the cell growth will be out of control, the pore size will be too large, and the interface bonding will be not tight. Example 1-8: If the holding pressure is too high, the cells will be over-compressed, the pore size will be too small, the buffering effect will be weakened, and the elasticity and fatigue performance of both are lower than those of Example 1-1.

[0087] Test methods for the performance of artificial shuttlecocks 1. Air drag coefficient (Cd): Wind tunnel test, wind speed 15m / s, test the drag coefficient of the feather, and take the average of 3 sets; 2. Flight trajectory deviation: On a standard badminton court, the badminton shuttlecock is continuously served by a badminton serving machine, and the trajectory deviation distance of the shuttlecock after it has flown for 10m is measured.

[0088] 3. Number of consecutive hits: The finished badminton shuttlecock is hit continuously using a badminton hitting tester. The hitting force simulates that of a moderate adult. The total number of hits from the start of the test until failure occurs (brush blade tearing, falling off, or shaft deformation) is recorded.

[0089] The test results are shown in Table 2.

[0090] Table 2

[0091] Analysis of the reasons for the differences in badminton performance 1. Factors affecting flight performance The flight performance of a badminton shuttlecock depends on the uniformity of the feather structure and the rationality of the bubble structure: Example 2-1 shows uniform and symmetrical feather bubble structure, resulting in a stable air resistance coefficient and low trajectory deviation; Examples 2-3, 2-6, and the two comparative examples, due to disordered feather bubble structure and insufficient elasticity, are prone to generating eddies when airflow passes through, increasing the drag coefficient and resulting in larger trajectory deviations. Comparative example 2-2, lacking a SIS (Self-Standing Interval), suffers from insufficient feather rigidity, making it prone to deformation during flight, resulting in the largest drag fluctuations and high trajectory deviations.

[0092] 2. Factors affecting durability Durability is directly related to the bonding strength of the feather interface and its elastic recovery ability: Example 2-1 has high feather interface bonding strength and elastic recovery rate, which can effectively disperse the impact force of the hit and the number of consecutive hits. Comparative Examples 2-1 and 2-2 have deteriorated feather performance, the interface is easy to separate and the feather is easy to break, resulting in insufficient number of consecutive hits. Examples 2-7 and 2-8 have poor bubble structure due to deviation of the holding pressure, resulting in a decrease in the impact force absorption capacity and a significant reduction in durability.

[0093] 3. Factors affecting center of gravity shift The center of gravity shift of all samples was ≤0.5mm. The main difference was due to the uniformity of feather weight: Comparative Example 2-1 had a slightly larger feather weight deviation due to disordered bubble structure, with a center of gravity shift of 0.5mm. The other examples all maintained a deviation of 0.3-0.4mm. This shows that the components and processes specified in this application can ensure the uniformity of feather weight, laying the foundation for flight stability.

[0094] Test results 1. The artificial feathers obtained in Examples 1-1 to 1-8 of this application, and the artificial shuttlecocks in Examples 2-1 to 2-8, have better performance than the comparative examples and meet national / industry standards, which confirms the effectiveness of the component ratio, process parameters, and structural design. 2. Example 1-1 has the best performance. The core reason is that its foaming agent ratio, LDPE melt index, SIS compounding ratio, and holding pressure all fit the optimal range defined in the claims. At the molecular level, it achieves a reasonable combination of cross-linking reinforcement, elastic buffering, and interface fusion. At the structural level, it forms uniform cells and gradient mechanical properties. 3. The performance degradation of the comparative samples all stems from deviations from the core limitations of the claims in this application, further proving the inventiveness and necessity of the technical solution in this application. All test data are repeatable and verifiable, meeting the requirements for full disclosure of a patent.

[0095] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An artificial feather, characterized in that, The artificial feather includes an artificial feather body and artificial feather reinforcing ribs; The artificial feather body comprises the following raw materials in parts by weight: 80-120 parts of low-density polyethylene, 0.4-0.6 parts of crosslinking agent, 1-3 parts of lubricant, and 3-6 parts of toughening agent; the crosslinking agent includes dicumyl peroxide, the lubricant includes butyl stearate, and the toughening agent includes ethylene-vinyl acetate copolymer. The artificial feather-like reinforcing ribs comprise the following raw materials in parts by weight: 40-60 parts low-density polyethylene, 5-7 parts composite foaming agent, 5-20 parts chopped carbon fiber, 6-10 parts SIS block copolymer, 4-7 parts maleic anhydride-grafted low-density polyethylene, 2-4 parts trisodium citrate, and 0.1-0.3 parts antioxidant.

2. The artificial feather according to claim 1, characterized in that, The composite foaming agent comprises azodicarbonamide and p-toluenesulfonyl hydrazine in a mass ratio of 7:(2.5-3.5).

3. The artificial feather according to claim 1, characterized in that, The mass ratio of the composite foaming agent to trisodium citrate is (1.5-2.5):

1.

4. The artificial feather according to claim 1, characterized in that, The melt index of the low-density polyethylene in the artificial feather body is 0.8-3 g / 10 min (190℃, 2.16 kg), and the melt index of the low-density polyethylene in the artificial feather reinforcing rib is 5-8 g / 10 min (190℃, 2.16 kg).

5. The artificial feather according to claim 1, characterized in that, The SIS block copolymers include SIS block copolymer 20 / 80 with an S / I block ratio of 20 / 80 and SIS block copolymer 25 / 75 with an S / I block ratio of 25 / 75, with a mass ratio of 1:(2-3).

6. A method for preparing an artificial feather according to any one of claims 1-5, characterized in that, The preparation steps include the following: S1: Raw material pretreatment: Weigh and mix the raw materials of the artificial feather body and the artificial feather reinforcing rib according to their respective mass parts to obtain the body mixture and the reinforcing rib mixture; S2: Blending and granulation: The bulk mixture is melt-blended and granulated to obtain bulk particles; the reinforcing rib mixture is melt-blended and granulated to obtain reinforcing rib particles; S3: Co-injection molding: The main body particles and reinforcing rib particles are co-injected, demolded, dried, and trimmed to obtain artificial feathers.

7. The method for preparing artificial feathers according to claim 6, characterized in that, The melt blending temperature of the bulk mixture is 160-180℃, the rotation speed is 250-300r / min, the melt blending temperature of the reinforcing rib mixture is 70-190℃, the rotation speed is 280-320r / min, the injection pressure is 70-90MPa, the holding pressure is 30-40MPa, the holding time is 15-20s, and the cooling time is 30-40s.

8. An artificial badminton shuttlecock, characterized in that, The device includes a clubhead and several clubs inserted into the clubhead. Each club has two identical feathers overlapping at its end away from the clubhead. Both identical feathers comprise the artificial feathers described in any one of claims 1-5, and / or the two identical feathers are prepared using the artificial feather preparation method described in claim 6. The two identical feathers are located on opposite sides of the club and are bonded to the club to form a connecting portion. At least one reinforcing retaining ring is also connected to the club between the feathers and the clubhead. Each feather has at least one reinforcing rib inside, and the reinforcing ribs are distributed radially in a biomimetic orientation along the geometric center of the feather. The club gradually tapers from the end near the clubhead to the end of the feather. The feathers include one or both of symmetrical and asymmetrical feathers, and the symmetrical feathers have an area of ​​290-350 mm². 2 The asymmetric pinnae have an area of ​​350-500 mm². 2 The angle between the connection formed by the two identical feathers bonded to the club and the end face of the club head is in the range of 60-75°, and the gap between adjacent feathers is 0.05-0.4mm.

9. The artificial shuttlecock according to claim 8, characterized in that, The feather is an asymmetrical feather, extending from the club joint to the end away from the club, and is wing-shaped overall. The width of the feather is asymmetrically and gradually distributed along the longitudinal direction. The first side edge of the feather is a smooth, outwardly convex arc-shaped profile extending upward from the club joint. The radius of curvature of this arc-shaped profile gradually increases and then decreases from bottom to top along the longitudinal direction, so that the degree of convexity of the first side edge gradually increases and then decreases with the increase of longitudinal height. The second side edge of the feather body is a composite arc-shaped profile extending upward from the club joint, including a convex section, a gently concave section and a narrowing section connected in sequence. The geometric center of the feather body is offset to one side relative to the central axis of the club joint, and the offset direction points to the side where the first side edge of the feather body is located.

10. The artificial shuttlecock according to claim 8, characterized in that, The feather is an asymmetrical feather with pores and zero to multiple through holes. The through holes include one or more of small circular through holes and large elongated through holes. The small circular through holes have a diameter of 1-3 mm, and the large elongated through holes have a length of 15-70 mm and a width of 1-3 mm. The pores are distributed in a gradient from the direction of trisodium citrate diffusion within the reinforcing rib to the direction away from the reinforcing rib.

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