Efficient water-permeable anti-puncture insole and preparation method thereof

Abstract

The invention belongs to the field of shoemaking, and particularly relates to a preparation method of an efficient water-permeable anti-puncture insole, which comprises the following steps: 1, preparing a fiber material, and outputting the fiber material as a fiber felt through a carding machine; 2, enabling the fiber felt to pass through a needling machine, and enabling a needle of the needling machine to penetrate into a fiber layer of the fiber felt in the direction perpendicular to the fiber felt; 3, enabling the fiber felt to pass through a needling machine, wherein a felting needle of the needling machine pierces into a fiber layer of the fiber felt in a direction inclined relative to the fiber felt; 4, the fiber felt subjected to needling treatment is laid in a multi-layer mode, and the fiber felt laid in the multi-layer mode is pressed and formed through a press machine; s5, preparing a polystyrene solution, and immersing the pressed and molded fiber felt into the polystyrene solution; 6, taking out the fiber felt from the polystyrene solution, and drying to cure the polystyrene solution in the fiber felt; 7, the dried fiber felt is ironed through a high-temperature ironing machine; and 8, shaping into the insole by matching a mold with the fibrofelt.

Description

Technical Field

[0001] The present invention belongs to the field of shoemaking, and particularly relates to an efficient water-permeable and puncture-resistant insole and a preparation method thereof. Background Art

[0002] In daily life and various working scenarios, as an item that directly contacts people's feet, the performance of insoles has become increasingly prominent. Currently, there are various types of insoles on the market, with different materials and structures, but there are still deficiencies in terms of efficient water permeability and puncture resistance.

[0003] The existing technologies closest to the present invention mainly include the following types of insoles: Traditional cotton insoles: These insoles are usually made of natural fibers such as cotton, have certain hygroscopicity and softness, and are relatively comfortable to wear. However, their water permeability is limited. When the feet sweat a lot, it is difficult to quickly drain the moisture, easily causing the feet to be damp and breeding bacteria. At the same time, the puncture resistance of cotton insoles is very poor, and they can hardly provide effective protection for the feet against sharp objects.

[0004] Ordinary rubber insoles: Rubber insoles have good elasticity and wear resistance, and can provide a buffering effect to a certain extent. However, the air permeability of rubber insoles is not good, and the water permeability is also poor, easily making the feet stuffy and damp. Moreover, the puncture resistance of the rubber material itself is limited, and the protective effect against sharp objects is not ideal.

[0005] Some functional insoles: There are also some insoles on the market that claim to have water-permeable or puncture-resistant functions. For example, some insoles made of special breathable materials, although the air permeability has been improved to a certain extent, the water permeability still needs to be improved, and the puncture resistance function is often insufficient. There are also some puncture-resistant insoles, which usually use harder materials or add metal sheets, etc. to achieve puncture resistance, but this will greatly reduce the comfort and air permeability of the insoles.

[0006] Insufficient water permeability: Both traditional cotton insoles and ordinary rubber insoles are difficult to quickly and effectively drain the sweat and moisture of the feet, easily keeping the feet in a damp state, which is not only uncomfortable but also increases the risk of bacterial growth and foot diseases. Even some insoles that claim to have water-permeable functions have water-permeable effects that are difficult to meet people's needs in high-intensity exercise, humid environments, etc.

[0007] Poor puncture resistance: Most of the existing insoles perform weakly in terms of puncture resistance. Cotton insoles have almost no puncture resistance. Ordinary rubber insoles and some functional insoles, although improved to a certain extent, still have limited protective effects against sharp objects. In some special environments, such as construction sites, the wild, etc., they cannot provide sufficient safety protection for the feet.

[0008] Difficult to balance performance: In the existing technology, it is often difficult to achieve both high water permeability and good puncture resistance simultaneously. Some insoles sacrifice breathability and comfort in order to improve puncture resistance, or reduce puncture resistance in pursuit of breathability. In addition, there are limitations in the material selection and structural design of existing insoles, and the advantages of various materials cannot be fully utilized to optimize performance.

[0009] Durability issues: After being used for a period of time, some insoles are prone to problems such as wear and deformation, resulting in performance degradation. Especially in the case of frequent use or harsh environments, their durability cannot meet people's needs.

[0010] Limited scope of application: Existing insoles are often designed for specific usage scenarios or populations, with a narrow scope of application. For example, some sports insoles may perform well during exercise, but may not be very suitable for daily work or other occasions. And some work insoles may lack in comfort and aesthetics and are not suitable for daily wear.

[0011] In the existing needled fibers, generally, loose fiber felts are subjected to vertical needling processing to form a vertical fiber structure to exert traction on the fiber felt in the up and down directions to increase the structural strength. After processing and compression treatment, the vertical needled fiber holes are compressed and compacted in an undirected manner during compression, and the hole structure disappears, leaving only the vertical fiber traction structure. The water permeability depends only on the tiny gaps between the fibers themselves, and the effect is extremely poor. Summary of the Invention

[0012] To solve the above problems, the present invention provides a highly water-permeable and puncture-resistant insole and its preparation method.

[0013] The object of the present invention is achieved in the following manner: A preparation method of a highly water-permeable and puncture-resistant insole, the method comprising: S1. Prepare fiber materials, and output the fiber materials through a carding machine to obtain a fiber felt 4 with a thickness of 20 - 60 mm; S2. Pass the fiber felt 4 through a needling machine, and the needles of the needling machine penetrate the fiber layer of the fiber felt 4 in a direction perpendicular to the fiber felt 4; S3. Pass the fiber felt 4 through a needling machine, and the needles of the needling machine penetrate the fiber layer of the fiber felt 4 in an inclined direction with respect to the fiber felt 4; S4. Lay the needled fiber felt 4 in multiple layers, and press and mold the multi-layer laid fiber felt 4 through a press; S5. Prepare a polystyrene solution, and immerse the press-molded fiber felt 4 in the polystyrene solution; S6. Take out the fiber felt 4 from the polystyrene solution and perform a drying treatment to solidify the polystyrene solution in the fiber felt 4. S7. Iron the dried fiber felt 4 with a high-temperature ironing machine. S8. Shape the fiber felt 4 into the insole 1 through a mold.

[0014] Further, in S1, the prepared fiber materials include at least one of aramid 1414 fibers and nylon 6 fibers.

[0015] Further, in S2, the needle punching depth is 5 - 7 mm, and the needle punching density is 50 - 60 needles per square centimeter.

[0016] Further, in S3, the piercing direction of the needle forms an angle of 50° - 70° with the surface of the fiber felt 4, the needle punching depth is 5 - 7 mm, and the needle punching density is 60 - 70 needles per square centimeter.

[0017] Further, in S4, the multi-layer laying is 2 - 6 layers, the pressure of the press is set to 8 - 10 MPa, the pressing time is 15 - 20 minutes, and the thickness of the pressed fiber felt 4 is 1.5 mm - 4 mm.

[0018] Further, in S5, the concentration of the polystyrene solution is 15% - 18%, the temperature is 55 - 60 °C, and the soaking time is 45 - 60 minutes.

[0019] Further, in S6, the drying method is hot air drying or infrared drying, the drying temperature is 85 - 95 °C, and the drying time is 2.5 - 3 hours.

[0020] Further, in S7, the ironing temperature of the high-temperature ironing machine is 180 - 190 °C, and the ironing time is 1.5 - 2 minutes.

[0021] An insole prepared by the above preparation method, including the insole 1 body. The insole 1 is formed by pressing a fiber felt 4. A vertical needle-punched fiber structure 2 perpendicular to the surface of the insole 1 is arranged in the insole 1, and the vertical needle-punched fiber structures 2 are arranged at intervals in the insole 1. It is characterized in that: Oblique needle-punched fiber structures 3 are also arranged at intervals in the insole 1. The oblique needle-punched fiber structures 3 form an angle α with the surface of the insole 1, 0 < α ≤ 4°. The oblique needle-punched fiber structures 3 form an inclined channel structure in the insole 1; The vertical needle-punched fiber structures 2 and the oblique needle-punched fiber structures 3 intersect or do not intersect in the insole 1.

[0022] Compared with the prior art, in the processing of the present invention, oblique needle-punched fiber treatment is carried out on the fiber felt. After compression, the oblique needle-punched fiber holes are flattened, but the channel structure of the hole shape will be retained because of the angle formed with the compression direction to form a hydrophobic channel structure convenient for absorbing moisture from the insole surface. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram during the needling treatment of the fiber felt; Figure 2 It is a schematic structural diagram during the multi-layer laying and pressing treatment of the fiber felt; Figure 3 It is a schematic structural diagram of the finished insole.

[0024] Among them, there are insole 1, vertical needled fiber structure 2, oblique needled fiber structure 3, and fiber felt 4. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0027] A preparation method for an insole with high water permeability and puncture resistance, the method is as follows: S1. Prepare fiber materials, and output the fiber materials through a carding machine to obtain a fiber felt 4 with a thickness of 20-60 mm; preferably, the prepared fiber materials include at least one of aramid 1414 fibers and nylon 6 fibers.

[0028] Aramid 1414: It has the characteristics of high strength, high modulus, high temperature resistance, corrosion resistance, etc. It is a high-performance synthetic fiber with the chemical name of poly(p-phenylene terephthalamide). It has excellent mechanical properties, including high strength and high modulus. High strength means that it can withstand large tensile forces without breaking easily, which provides a good anti-puncture foundation for insoles. High modulus means that its deformation is relatively small when subjected to force, which can maintain the stability of the insole structure and ensure that the insole will not deform excessively when under pressure, thereby effectively protecting the foot. In addition, it also has the characteristics of high temperature resistance and corrosion resistance, which enables it to maintain stable performance in various complex environments. For example, in a high temperature environment, the strength will not decrease due to the increase in temperature, and it will not be easily corroded when exposed to chemicals in sweat, thereby extending the service life of the insole.

[0029] Nylon 6 series: It is flexible and wear-resistant, which can increase the comfort and durability of the insole. It is a kind of polyamide fiber with amide bonds in its molecular chain. This makes the nylon 6 series fiber have good wear resistance. In daily use, even if the insole is frequently rubbed by the foot, it can maintain good performance. At the same time, it is also flexible, which allows the insole to better fit the shape of the foot and make it more comfortable to wear. Moreover, it can also provide a certain strength to a certain extent to help the insole withstand the pressure of the foot.

[0030] According to different usage requirements, one fiber can be used alone or in combination.

[0031] S2, as attached Figure 1 As shown, the fiber felt 4 is passed through a needling machine, and the needles of the needling machine penetrate into the fiber layer of the fiber felt 4 in a direction perpendicular to the fiber felt 4; preferably, the needling depth is 5-7 mm, and the needling density is 50-60 needles per square centimeter.

[0032] Non-woven needle punching machine: This is a device used to make non-woven fabrics. Non-woven fabrics are non-woven fabrics that are made of oriented or random fibers through friction, bonding or bonding. Vertical needle punching: When using a non-woven needle punching machine, vertical needle punching means that the needles penetrate the fiber layer in a direction perpendicular to the fiber layer. This needle punching method can make the fibers interweave in a vertical direction, making the fiber layer initially compact, laying the foundation for subsequent processing and the strength of the insole. S3. The fiber felt 4 is passed through a needling machine, and the needles of the needling machine penetrate into the fiber layer of the fiber felt 4 in an inclined direction relative to the fiber felt 4; preferably, the penetration direction of the needles forms an angle of 50 to 70 degrees with the surface of the fiber felt 4, preferably 60 degrees, the needling depth is 5 to 7 mm, and the needling density is 60 to 70 needles per square centimeter.

[0033] These parameters determine the interweaving pattern between the fibers and the internal structure formed, directly affecting the strength, breathability, and drainage performance of the insole. For example, a specific combination of factors such as the depth, density, and angle of needling has been optimized through experiments.

[0034] S4. As shown in the appendix Figure 2 The needled fiber felt 4 is laid in multiple layers. The multiple-layer laid fiber felt 4 is pressed and formed by a press; preferably, the multiple layers are 2 - 6 layers, the pressure of the press is set to 8 - 10 MPa, the pressing time is 15 - 20 minutes, and the thickness of the pressed and formed fiber felt 4 is 1.5 mm - 4 mm, preferably pressed from a total thickness of 150 mm to 2 mm. A professional press is used to press and form the multi-layer material. The material is placed in the mold of the press, and a certain pressure is applied to make the material bond tightly. The press should have sufficient pressure and precision to apply the pressure evenly. During the laying process, the flatness and alignment of each layer of material should be ensured to avoid misalignment or wrinkles. These are the key parameters of the process. These parameters not only relate to the thickness and weight of the insole but also affect the strength and comfort of the insole.

[0035] S5. Prepare a polystyrene solution and immerse the pressed and formed fiber felt 4 in the polystyrene solution; preferably, the concentration of the polystyrene solution is 15% - 18%, the temperature is 55 - 60 degrees Celsius, and the soaking time is 45 - 60 minutes. These parameters determine the penetration degree and reinforcement effect of polystyrene inside the insole.

[0036] The impregnation process is a processing method that penetrates a liquid material (in this patent, it is a polystyrene solution) into the internal fiber structure of a solid material (the insole). During this process, the insole is immersed in the polystyrene solution, and the solution will gradually fill the voids between the fibers under the influence of factors such as capillary action. After subsequent treatments such as drying, polystyrene will form a reinforcing phase inside the insole, evenly distributed between the fibers, further strengthening the structure of the insole, just like filling a reinforcing material in the frame structure of a building.

[0037] Polystyrene is a common thermoplastic. In this patent, it is mainly used to increase the strength of the insole. The close arrangement of the polystyrene molecular chains gives it relatively high strength and hardness. When combined with fiber materials, it can fill the voids between the fibers, strengthen the connection between the fibers, and stick the fibers tightly together like "glue", thereby improving the overall strength and puncture resistance of the insole.

[0038] S6. Take out the fiber felt 4 from the polystyrene solution and perform a drying treatment to solidify the polystyrene solution inside the fiber felt 4; preferably, the drying method is hot air drying or infrared drying, the drying temperature is 85 - 95 degrees Celsius, and the drying time is 2.5 - 3 hours.

[0039] S7. Iron the dried fiber felt 4 with a high-temperature ironing machine; preferably, the ironing temperature of the high-temperature ironing machine is 180 - 190 °C, and the ironing time is 1.5 - 2 minutes. These process parameters can ensure the appearance quality, dimensional accuracy, and overall performance of the insole.

[0040] S8. Shape the fiber felt 4 into the insole 1 through a mold.

[0041] An insole prepared by the above preparation method, including the insole 1 body. The insole 1 is made by pressing the fiber felt. A vertical needle-punched fiber structure 2 perpendicular to the surface of the insole 1 is arranged inside the insole 1, and the vertical needle-punched fiber structures 2 are arranged at intervals inside the insole 1. An inclined needle-punched fiber structure 3 is also arranged at intervals inside the insole 1. The inclined needle-punched fiber structure 3 forms an angle α with the surface of the insole 1, where 0 < α ≤ 4°. The inclined needle-punched fiber structure 3 forms an inclined channel structure inside the insole 1. The vertical needle-punched fiber structure 2 and the inclined needle-punched fiber structure 3 may intersect or not intersect inside the insole 1. When the vertical needle-punched fiber structure 2 and the inclined needle-punched fiber structure 3 intersect, the structural strength is higher. According to the above preparation method, on the same plane layer of the insole 1, the density of the vertical needle-punched fiber structure 2 is 50 - 60 per square centimeter, and the density of the inclined needle-punched fiber structure 3 is 60 - 70 per square centimeter.

[0042] Structurally: 1. Structure similar to cotton felt: The insole 1 has a structure similar to cotton felt, and the soft comfort and good air permeability brought by this structure are important characteristics of the product.

[0043] 2. Drainage structure similar to sponge: The drainage structure similar to sponge is the key to the high-efficiency water permeability of the insole 1. This includes the formation method of internal micro-pores, the connectivity between pores, etc.

[0044] Puncture resistance: In addition to using the combination of fibers and polystyrene to improve puncture resistance mentioned in the above invention, the prior art is also exploring other materials and structures to achieve better puncture resistance effects. For example, using a multi-layer composite material structure, compounding high-strength fibers with materials such as metal sheets, or adding special anti-puncture coatings to the insole. These technologies have certain applications in fields such as military and industrial protective shoes, but the cost is relatively high, and the promotion in the civilian ordinary insole market is subject to certain limitations.

[0045] Water permeability: In terms of water permeability, common methods in the market to increase the water permeability of insoles include physical methods such as punching and slotting. However, this way is likely to affect the overall strength and service life of the insole. Products that use a drainage structure similar to a sponge to achieve efficient water permeability like in the present invention are relatively few. Some high-end sports insole brands may adopt a similar principle and use special fiber weaving or foaming processes to manufacture insoles with good water permeability, but there is still room for improvement in terms of popularity and cost-effectiveness.

[0046] I. Practical applications in the sports field 1. Sports insoles: In sports shoes, this kind of insole with efficient water permeability and puncture resistance can greatly enhance the experience of athletes. For example, in basketball, athletes frequently jump, stop suddenly and turn, and their feet will produce a lot of sweat. The efficient water permeability of this insole can quickly drain the sweat, keep the feet dry, and reduce the discomfort and slipping risk caused by wet feet. At the same time, in basketball, players may accidentally step on other players' feet or sharp objects on the court, and the puncture resistance function can effectively protect the feet from injury. In the sports shoes of other sports such as football, tennis, and running, this insole can also play the same advantages, improving the comfort and safety of sports.

[0047] 2. Expansion of sports equipment: In addition to the insole itself, this technology can also be applied to sports protective gear. For example, in football shin guards, a similar material combination and structural design can be adopted to make them have better puncture resistance and breathability, providing more comprehensive protection for athletes.

[0048] II. Practical applications in the outdoor field 1. Outdoor sports insoles: For outdoor activities such as hiking and mountaineering, this kind of insole is an ideal choice. During a long hiking process, the feet are prone to sweating, and the outdoor environment is complex, and there may be sharp objects such as thorns and stones. The water permeability and puncture resistance functions of this insole can well handle these situations, ensuring the comfort and safety of the feet. In hiking boots, the insole can also adapt to different terrains and pressures, providing good support for the feet.

[0049] 2. Expansion of outdoor equipment: The technology can be applied to the shoe part of outdoor tents. Some high-end tents have independent "shoe storage areas". Using this kind of material with puncture resistance and water permeability in this area can prevent users from being stabbed by sharp objects on the ground when entering and leaving the tent, and at the same time keep the inside of the shoe storage area dry.

[0050] III. Practical applications in the work protection field 1. Work shoe insole: In workplaces such as construction sites and factories, employees need to stand or walk for long periods and may come into contact with various sharp tools and objects. This insole can be applied to work shoes to provide employees with a comfortable wearing experience and reliable puncture protection. For example, on a construction site, when this insole is installed in a worker's shoes, even if they accidentally step on a sharp object like a nail, it can effectively prevent foot injuries. At the same time, its efficient water permeability allows the feet to remain dry after long hours of work.

[0051] 2. Expansion of work equipment: In some work scenarios that require hand protection, such as gardening work, gloves can draw on the materials and structures of the insole. Similar material combinations are used in the palm and finger parts of the gloves to enhance the puncture resistance of the gloves. At the same time, through special knitting structure design, the gloves have good breathability to prevent excessive sweating of the hands.

[0052] IV. Potential applications in the military field 1. Military boot insole: In military operations, the foot health and safety of soldiers are of crucial importance. This insole can be applied to military boots to adapt to various complex terrains and combat environments. In situations such as field marches and combat drills, its efficient water permeability can keep the soldiers' feet dry and reduce the decline in combat effectiveness caused by foot problems. The puncture protection function can resist sharp objects that may be encountered on the battlefield, such as bamboo sticks and metal fragments, to protect the safety of the soldiers' feet.

[0053] 2. Expansion of military equipment: Similar materials are used at the bottom of military backpacks or in the contact parts of the carrying systems to prevent sharp objects from piercing the bottom of the backpack and to have good breathability, thus extending the service life of the equipment.

[0054] V. Potential applications in the field of medical rehabilitation 1. Rehabilitation shoe insole: For some patients with foot injuries or foot diseases, such as diabetic foot patients, the puncture protection function of this insole can prevent the foot from being accidentally stabbed and aggravating the condition. At the same time, the water permeability helps to keep the foot clean and dry, which is beneficial to the healing of the wound. Using this insole in rehabilitation shoes can provide a comfortable rehabilitation environment for patients.

[0055] 2. Expansion of medical equipment: In the foot support parts of some medical devices, such as the foot pedals of leg rehabilitation trainers, using this material can make the patient feel more comfortable when using the device and prevent the device from causing harm to the foot.

[0056] The above are only the preferred embodiments of the present invention. It should be noted that for those skilled in the art, without departing from the overall concept of the present invention, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present invention.

Claims

1. A method for preparing a highly efficient water-permeable and puncture-proof insole, characterized in that: The method is: S1, preparing fiber material, and outputting the fiber material into a fiber mat (4) through a carding machine, wherein the thickness of the fiber mat (4) is 20 to 60 mm; S2, passing the fiber felt (4) through a needle loom, wherein the needles of the needle loom penetrate into the fiber layer of the fiber felt (4) in a direction perpendicular to the fiber felt (4); S3, passing the fiber felt (4) through a needling machine, wherein the needles of the needling machine penetrate into the fiber layer of the fiber felt (4) in a direction inclined relative to the fiber felt (4); S4, laying the needle-punched fiber felt (4) in multiple layers, and pressing the multiple layers of laid fiber felt (4) into shape using a press; S5, preparing a polystyrene solution, and immersing the pressed fiber felt (4) into the polystyrene solution; S6, taking out the fiber felt (4) from the polystyrene solution and performing a drying process to solidify the polystyrene solution in the fiber felt (4); S7, ironing the dried fiber felt (4) through a high-temperature ironing machine; S8. The fiber felt (4) is shaped into an insole (1) by using a mold and the fiber felt (4).

2. The method for preparing a highly efficient water-permeable and puncture-resistant insole according to claim 1, characterized in that: In S1, the prepared fiber material includes at least one of aramid 1414 fiber and nylon 6 fiber.

3. The method for preparing a highly efficient water-permeable and puncture-resistant insole according to claim 1, characterized in that: In S2, the needling depth was 5-7 mm and the needling density was 50-60 needles per square centimeter.

4. The method for preparing a highly efficient water-permeable and puncture-resistant insole according to claim 1, characterized in that: In S3, the piercing direction of the needle forms an angle of 50 to 70 degrees with the surface of the fiber felt (4), the piercing depth is 5 to 7 mm, and the piercing density is 60 to 70 needles per square centimeter.

5. The method for preparing a highly efficient water-permeable and puncture-resistant insole according to claim 1, characterized in that: In S4, the multi-layer laying is set to 2 to 6 layers, the pressure of the press is set to 8 to 10 MPa, the pressing time is 15 to 20 minutes, and the thickness of the pressed fiber felt (4) is 1.5 mm to 4 mm.

6. The method for preparing a highly efficient water-permeable and puncture-resistant insole according to claim 1, characterized in that: In S5, the concentration of the polystyrene solution is 15%-18%, the temperature is 55-60 degrees Celsius, and the immersion time is 45-60 minutes.

7. The method for preparing a highly efficient water-permeable and puncture-resistant insole according to claim 1, characterized in that: In S6, the drying method is hot air drying or infrared drying, the drying temperature is 85-95 degrees Celsius, and the drying time is 2.5-3 hours.

8. The method for preparing a highly efficient water-permeable and puncture-resistant insole according to claim 1, characterized in that: In S7, the ironing temperature of the high temperature ironing machine is 180-190 degrees Celsius, and the ironing time is 1.5-2 minutes.

9. An insole prepared by the preparation method according to any one of claims 1 to 8, comprising an insole (1) body, wherein the insole (1) is formed by pressing a fiber felt (4), wherein a vertical needle-punched fiber structure (2) perpendicular to the surface of the insole (1) is arranged inside the insole (1), and wherein the vertical needle-punched fiber structure (2) is arranged at intervals inside the insole (1), characterized in that: The insole (1) is also provided with oblique needle-punched fiber structures (3) at intervals. The oblique needle-punched fiber structures (3) form an angle α with the surface of the insole (1), 0<α≤4°. The oblique needle-punched fiber structures (3) form an inclined channel structure in the insole (1); the vertical needle-punched fiber structures (2) and the oblique needle-punched fiber structures (3) intersect or do not intersect in the insole (1).

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