CN120036560A - Efficient permeable puncture-preventing insole and preparation method thereof - Google Patents

Abstract

The invention belongs to the field of shoemaking, and particularly relates to a preparation method of an efficient permeable puncture-proof insole, which comprises the steps of 1 preparing fiber materials, enabling the fiber materials to be output into a fiber felt through a carding machine, 2 enabling needles of the needle machine to penetrate into a fiber layer of the fiber felt in the vertical direction relative to the fiber felt, 3 enabling the needles of the needle machine to penetrate into the fiber layer of the fiber felt in the inclined direction relative to the fiber felt through the needle machine, 4 paving the fiber felt subjected to the needle treatment in multiple layers, and pressing the fiber felt paved in multiple layers through a pressing machine, S5 preparing a polystyrene solution, immersing the pressed fiber felt into the polystyrene solution, 6 taking the fiber felt out of the polystyrene solution, drying the fiber felt, enabling the polystyrene solution in the fiber felt to be solidified, 7 enabling the dried fiber felt to be subjected to ironing through a high Wen Tangping machine, and 8 enabling the fiber felt to be matched with a die to be shaped into the insole.

Description

Efficient permeable puncture-preventing insole and preparation method thereof

Technical Field

The invention belongs to the field of shoemaking, and particularly relates to an efficient permeable puncture-proof insole and a preparation method thereof.

Background

In daily life and various working scenes, the importance of the performance of insoles as articles in direct contact with the feet of people is increasingly highlighted. At present, various types of insoles exist on the market, and the materials and structures of the insoles are different, but the insoles still have the defects in the aspects of efficient water permeation and puncture prevention.

The closest prior art to the present invention consists essentially of insoles of the following types:

The traditional cotton insoles are generally made of natural fibers such as cotton and the like, have certain hygroscopicity and softness and are comfortable to wear. However, the water permeability is limited, and when the foot sweats more, it is difficult to quickly drain the water, which easily causes the foot to be wet and bacteria to grow. Meanwhile, the cotton insole has poor puncture resistance, and almost cannot provide effective protection for feet and prevent injury of sharp objects.

The common rubber insole has better elasticity and wear resistance, and can provide buffer effect to a certain extent. However, the rubber insoles have poor air permeability and poor water permeability, and the feet are easy to be sultry and wet. Moreover, the rubber material itself has limited puncture resistance and is not ideal for protecting sharp objects.

Some functional insoles are also sold in the market, and some insoles claim to have a water permeable or puncture preventing function. For example, some insoles made of special breathable materials have improved breathability to some extent, but water permeability is still to be improved, and the puncture preventing function is often insufficient. Still other penetration-resistant insoles are commonly made of harder materials or added metal sheets, but this can lead to a significant loss of comfort and breathability of the insole.

The water permeability is insufficient, the sweat and the water of the feet are difficult to be discharged rapidly and effectively by the traditional cotton insoles and the common rubber insoles, the feet are easy to be in a wet state, the user is uncomfortable, and the risk of bacterial breeding and foot diseases is increased. Even part of insoles which claim to have a water permeable function have difficulty in meeting the demands of people in high-strength sports, humid environments and the like.

The puncture-proof performance is poor, and most of the prior insoles have weaker puncture-proof performance. Cotton insoles have little puncture resistance, and common rubber insoles and some functional insoles have limited protection against sharp objects although improved to some extent. In some special environments, such as construction sites, the field, etc., adequate safety for the feet cannot be provided.

The performance is difficult to be taken into consideration, and in the prior art, high-efficiency water permeability and good puncture resistance are often difficult to be realized simultaneously. Some insoles sacrifice breathability and comfort in order to increase puncture resistance, or decrease puncture resistance in order to pursue breathability. In addition, the prior insoles have limitations in material selection and structural design, and cannot fully exert the advantages of various materials, thereby realizing the optimization of performance.

The durability problem is that after a part of insoles are used for a period of time, the problems of abrasion, deformation and the like are easy to occur, so that the performance is reduced. Particularly in frequent use or severe environments, the durability thereof is difficult to meet the demands of people.

The application range is limited, the existing insoles are designed aiming at specific use scenes or crowds, and the application range is narrow. For example, some athletic insoles may perform well during exercise, but may not be well suited for use in everyday work or other situations. While some work insoles may be lacking in comfort and aesthetics and are not suitable for daily wear.

The needled fiber in the prior art is generally subjected to vertical needling processing on a loose fiber mat, so that the fiber mat is pulled up and down by the formed vertical fiber structure, the structural strength is increased, the compression processing is carried out after the processing, the non-directional compaction of the vertical needled fiber holes in the compression is compact, the hole structure disappears, only the vertical fiber pulling structure is left, the water permeability only depends on the tiny gap of the fiber, and the effect is extremely poor.

Disclosure of Invention

In order to solve the problems, the invention provides an efficient permeable puncture-proof insole and a preparation method thereof.

The invention aims to realize the preparation method of the high-efficiency permeable puncture-preventing insole, which comprises the following steps:

s1, preparing a fiber material, and outputting the fiber material into a fiber felt 4 through a carding machine, wherein the thickness of the fiber felt 4 is 20-60 mm;

S2, enabling the fiber mat 4 to pass through a needling machine, wherein needles of the needling machine penetrate into fiber layers of the fiber mat 4 in a perpendicular direction relative to the fiber mat 4;

S3, enabling the fiber mat 4 to pass through a needling machine, wherein needles of the needling machine penetrate into fiber layers of the fiber mat 4 in an inclined direction relative to the fiber mat 4;

S4, carrying out multi-layer paving on the fiber mats 4 subjected to the needling treatment, and carrying out compression molding on the multi-layer paved fiber mats 4 through 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 drying to solidify the polystyrene solution in the fiber felt 4;

S7, ironing the dried fiber felt 4 by a high Wen Tangping machine;

S8, shaping the insole 1 by matching the die with the fiber felt 4.

Further, in S1, the prepared fiber material includes at least one of aramid 1414 fiber and nylon 6 fiber.

Further, in S2, the needling depth is 5-7 mm, and the needling density is 50-60 needles per square centimeter.

Further, in S3, the penetration direction of the needles forms 50-70 degrees with the surface of the fiber mat 4, the penetration depth is 5-7 mm, and the penetration density is 60-70 needles per square centimeter.

In the step S4, 2-6 layers are paved in a multi-layer mode, the pressure of a press machine is set to be 8-10 megapascals, the pressing time is 15-20 minutes, and the thickness of the pressed fiber felt 4 is 1.5 mm-4 mm.

Further, in S5, the concentration of the polystyrene solution is 15-18%, the temperature is 55-60 ℃, and the soaking time is 45-60 minutes.

In the step S6, the drying mode is hot air drying or infrared drying, the drying temperature is 85-95 ℃, and the drying time is 2.5-3 hours.

In the S7, the ironing temperature of the high Wen Tangping machine is 180-190 ℃ and the ironing time is 1.5-2 minutes.

The insole prepared by the preparation method comprises an insole 1 body, wherein the insole 1 is formed by pressing a fiber felt 4, vertical needling fiber structures 2 perpendicular to the surface of the insole 1 are arranged in the insole 1, and the vertical needling fiber structures 2 are arranged in the insole 1 at intervals, and the insole is characterized in that oblique needling fiber structures 3 are also arranged in the insole 1 at intervals, an included angle alpha is formed between the oblique needling fiber structures 3 and the surface of the insole 1, the angle alpha is smaller than or equal to 4 degrees, the oblique needling fiber structures 3 form an inclined channel structure in the insole 1, and the vertical needling fiber structures 2 and the oblique needling fiber structures 3 intersect or do not intersect in the insole 1.

Compared with the prior art, the invention carries out oblique needling fiber treatment on the fiber mat during processing, after compression, the oblique needling fiber holes are flattened, but the hole-shaped channel structure of the fiber mat can be reserved because of forming an angle with the compression direction, so as to form a hydrophobic channel structure which is convenient for absorbing moisture from the surface of the insole.

Drawings

FIG. 1 is a schematic view of a structure of a fiber mat during needling;

FIG. 2 is a schematic view of the structure of a fiber mat during a multi-layer laying and pressing process;

fig. 3 is a schematic view of the structure of the finished insole.

Wherein, the insole 1, the vertical needled fiber structure 2, the oblique needled fiber structure 3 and the fiber felt 4.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the present invention, unless explicitly specified and limited otherwise, 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., are used for convenience of description and for simplifying the description only with respect to the orientation or positional relationship shown in the drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.

A preparation method of an efficient permeable puncture-proof insole comprises the following steps:

S1, preparing a fiber material, outputting the fiber material into a fiber felt 4 through a carding machine, wherein the thickness of the fiber felt 4 is 20-60 mm, and preferably, the prepared fiber material comprises at least one of aramid 1414 fibers and nylon 6 fibers.

The aramid 1414 has the characteristics of high strength, high modulus, high temperature resistance, corrosion resistance and the like, is a high-performance synthetic fiber, and has 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 puncture-proof basis for the insole. The high modulus means that the deformation is relatively small when being stressed, the stability of the insole structure can be maintained, and the insole is ensured not to excessively deform when bearing pressure, thereby effectively protecting feet. In addition, it has the characteristics of high temperature resistance and corrosion resistance, so that the insole can keep stable performance in various complex environments, such as the strength is not reduced due to temperature rise in the high temperature environment, and the insole can not be corroded easily when contacting chemical substances in sweat, thereby prolonging the service life of the insole.

Nylon 6 series, which has flexibility and wear resistance and can increase the comfort and durability of the insole, is one kind of polyamide fiber, and has amide bond in the molecular chain. This makes nylon 6 series fiber have good wearability, and in daily use, even shoe-pad frequently receives foot friction, still can keep better performance. Meanwhile, the shoe pad has flexibility, and the shoe pad can better fit the shape of the foot, so that the user can wear the shoe pad more comfortably. Moreover, the insole can provide certain strength to a certain extent and help the insole bear the pressure of feet.

Depending on the application requirements, one fiber may be used alone or in a mixture.

S2, as shown in the attached figure 1, the fiber felt 4 is passed through a needling machine, and needles of the needling machine penetrate into a fiber layer of the fiber felt 4 in a vertical direction relative to the fiber felt 4, wherein the needling depth is preferably 5-7 mm, and the needling density is preferably 50-60 needles per square centimeter.

A nonwoven needling machine, which is an apparatus for manufacturing nonwoven. Nonwoven fabrics are a type of nonwoven fabric, which is a sheet made of oriented or random fibers by friction, cohesion or bonding. Vertical needling, which means that the needles penetrate in a direction perpendicular to the fibrous layer when using a nonwoven needling machine. The needling mode can interweave the fibers in the vertical direction, so that the fiber layer is preliminarily compacted, and a foundation is laid for subsequent processing and strength of the insole

And S3, enabling the fiber mat 4 to pass through a needling machine, wherein needles of the needling machine penetrate into a fiber layer of the fiber mat 4 in an inclined direction relative to the fiber mat 4, preferably, the penetrating direction of the needles and the surface of the fiber mat 4 form 50-70 degrees, preferably 60 degrees, the needling depth is 5-7 mm, and the needling density is 60-70 needles per square centimeter.

These parameters determine the manner in which the fibers are interwoven and the internal structure formed, directly affecting the strength, breathability and drainage properties of the insole. For example, the specific combination of factors such as depth, density, angle, etc. of the needling is experimentally optimized.

S4, as shown in the attached drawing 2, carrying out multi-layer paving on the fiber felt 4 subjected to the needling treatment, and carrying out compression molding on the multi-layer paved fiber felt 4 by a press, wherein the multi-layer paving is preferably carried out by paving 2-6 layers, the press pressure is set to 8-10 megapascals, the compression time is 15-20 minutes, the thickness of the pressed fiber felt 4 is 1.5 mm-4 mm, and the total thickness is preferably pressed to 2mm by 150 mm. The multilayer material is compression molded using a specialized press. The material is put into a die of a press machine, a certain pressure is applied to tightly combine the materials, and the press machine has enough pressure and precision to uniformly apply the pressure. In the laying process, the flatness and alignment degree of each layer of material are ensured, and dislocation or fold is avoided. Is a key parameter of the process. These parameters are not only related to the thickness and weight of the insole, but also affect the strength and comfort of the insole.

S5, preparing a polystyrene solution, immersing the pressed fiber felt 4 into the polystyrene solution, wherein the concentration of the polystyrene solution is preferably 15-18%, the temperature is 55-60 ℃, and the immersing time is 45-60 minutes. These parameters determine the degree of penetration and the reinforcing effect of the polystyrene inside the insole.

The impregnation process is a process for impregnating the inside of the fibrous structure of the solid material insole with a solution of a liquid material, in this patent polystyrene. In this process, the insole is immersed in a polystyrene solution, which gradually fills the interstices between the fibers under the influence of capillary action and the like. After post-treatment such as drying, the polystyrene can form reinforcing phases in the insole, and the reinforcing phases are uniformly distributed among the fibers, so that the structure of the insole is further reinforced, and the structure is just like filling reinforcing materials in the frame structure of a building.

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 the polystyrene molecular chains higher strength and hardness, when combined with the fiber materials, the polystyrene molecular chains can fill gaps among the fibers, strengthen the connection among the fibers, and tightly adhere the fibers together like glue, so that the overall strength and puncture resistance of the insole are improved.

S6, taking out the fiber felt 4 from the polystyrene solution, and drying to solidify the polystyrene solution in the fiber felt 4, wherein the drying mode is preferably hot air drying or infrared drying, the drying temperature is 85-95 ℃, and the drying time is 2.5-3 hours.

S7, carrying out ironing treatment on the dried fiber mat 4 by a high Wen Tangping machine, wherein the ironing temperature of the high Wen Tangping machine is preferably 180-190 ℃ and the ironing time is 1.5-2 minutes. These process parameters can ensure the quality of the appearance, dimensional accuracy and overall performance of the insole.

S8, shaping the insole 1 by matching the die with the fiber felt 4.

The insole prepared by the preparation method comprises an insole 1 body, wherein the insole 1 is formed by pressing fiber felts, vertical needling fiber structures 2 perpendicular to the surface of the insole 1 are arranged in the insole 1, the vertical needling fiber structures 2 are arranged in the insole 1 at intervals, oblique needling fiber structures 3 are arranged in the insole 1 at intervals, an included angle alpha is formed between the oblique needling fiber structures 3 and the surface of the insole 1, the angle alpha is smaller than or equal to 0 degrees and smaller than 4 degrees, the oblique needling fiber structures 3 form an inclined channel structure in the insole 1, the vertical needling fiber structures 2 and the oblique needling fiber structures 3 are intersected or not intersected in the insole 1, the structural strength is higher when the vertical needling fiber structures 2 and the oblique needling fiber structures 3 are intersected, according to the preparation method, the density of the vertical needling fiber structures 2 is 50-60 per square centimeter, and the density of the oblique needling fiber structures 3 is 60-70 per square centimeter on the same layer of plane of the insole 1.

Structurally, it is:

1. the structure of the cotton felt-like insole 1 has a structure similar to that of cotton felt, and soft and comfortable feeling and good air permeability brought by the structure are important characteristics of the product.

2. The sponge-like drainage structure is the key of the high-efficiency water permeability of the insole 1. This includes the manner in which the internal micro-voids are formed, connectivity between the voids, etc.

Puncture preventing Property in addition to the combination of fibers and polystyrene mentioned in the above invention to enhance puncture preventing properties, the prior art is exploring other materials and structures to achieve better puncture preventing effects. For example, a multi-layer composite material structure is adopted, high-strength fibers are compounded with materials such as a metal sheet and the like, or a special puncture-resistant coating is added into the insole. The technology has certain application in the fields of military, industrial protective shoes and the like, but has relatively high cost, and is limited in popularization in the civil common insole market.

Water permeability in water permeability, physical methods such as punching and slotting are commonly used in the market to increase the water permeability of the insole, but the mode easily affects the overall strength and the service life of the insole. However, there are relatively few products for realizing high-efficiency water permeability by using a sponge-like drainage structure similar to the present invention, and some high-end sports insole brands may use similar principles to manufacture insoles with good water permeability through special fiber weaving or foaming processes, but the popularity and cost performance are still to be improved.

Practical application in sports field

1. In the sports shoes, the high-efficiency water-permeable puncture-preventing insole can greatly improve the experience of athletes. For example, in basketball practice, the athlete frequently jumps, scrubs, and turns, and the foot may generate a lot of perspiration. The high-efficiency water permeability of the insole can rapidly discharge sweat, keep feet dry and cool, and reduce uncomfortable feeling and slipping risk caused by foot dampness. Meanwhile, a player may accidentally step on the feet of other players or sharp objects in the field in basketball, and the puncture-preventing function can effectively protect the feet from injury. In sports shoes for other sports such as football, tennis, running and the like, the insole can also play the same advantages, and improves the comfort and safety of sports.

2. The sports equipment is expanded that the technology can be applied to sports protective equipment besides insoles. For example, in the football leg guard, similar material combination and structural design are adopted, so that the football leg guard has better puncture resistance and ventilation property, and provides more comprehensive protection for athletes.

2. Practical application in outdoor field

1. The outdoor sport insole is an ideal choice for outdoor activities such as hiking, mountain climbing and the like. During long hiking, the feet are easy to sweat, and the outdoor environment is complex, so that sharp objects such as thorns, stones and the like can be encountered. The water permeable and puncture preventing functions of the insole can well cope with the conditions, and the comfort and safety of feet are ensured. In the climbing shoes, the insoles can also adapt to different terrains and pressures, and provide good support for feet.

2. Outdoor equipment expansion the technology can be applied to the shoe portion of an outdoor tent. Some high-end tents have separate "shoe bins" where they are made of such materials that provide puncture and water penetration preventing properties, preventing the user from being pricked by the sharp objects on the ground while entering and exiting the tent, while keeping the interior of the shoe bin dry.

3. Practical application in the field of work protection

1. Work shoe insoles-staff are required to stand or walk for a long time at work places such as buildings, factories, etc., and may come into contact with various sharp tools and objects. The insole can be applied to working shoes, and provides comfortable wearing experience and reliable puncture protection for staff. For example, after the shoe pad is installed in the shoes of workers on a construction site, the foot injury can be effectively avoided even if people step on sharp objects such as nails carelessly. Meanwhile, the efficient water permeability can ensure that feet of workers still keep dry after long-time work.

2. Work equipment expansion in some work scenes needing hand protection, such as gardening work, the glove can reference the material and the structure of the insole. The palm and the fingers of the glove are made of similar materials, so that the puncture resistance of the glove is enhanced, and meanwhile, the glove has good air permeability and can prevent excessive perspiration of the hand through the special knitting structure design.

4. Potential application in military field

1. Army boots insoles, in military operations, the foot health and safety of soldiers are important. The insole can be applied to Yu Jun boots and is suitable for various complex terrains and combat environments. Under the conditions of field marching, combat exercise and the like, the high-efficiency water permeability can keep the feet of soldiers dry, and the fight force reduction caused by foot problems is reduced. The puncture preventing function can resist sharp objects possibly encountered on a battlefield, such as bamboo sticks, metal fragments and the like, and protect the foot safety of soldiers.

2. The military equipment is expanded that the bottom of the military backpack or the contact part of the backpack system is made of similar materials, so that a sharp object can be prevented from puncturing the bottom of the backpack, and meanwhile, the military equipment has good air permeability, and the service life of the equipment is prolonged.

5. Potential application in medical rehabilitation field

1. The anti-puncture function of the insole can prevent the foot from being hurt by accident or aggravated by foot diseases for some patients with foot injuries or foot diseases, such as diabetic foot patients. Meanwhile, the water permeability is favorable for keeping feet clean and dry, and is favorable for wound healing. The insole can provide a comfortable rehabilitation environment for patients when used in rehabilitation shoes.

2. Medical equipment expansion is that the foot supporting parts of some medical equipment, such as foot pedals of leg rehabilitation training devices, are made of the material, so that a patient can feel more comfortable when using the equipment, and the equipment is prevented from damaging the feet.

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several changes and modifications can be made without departing from the general inventive concept, and these should also be regarded as the scope of the invention.

Claims (9)

1. The preparation method of the high-efficiency permeable puncture-preventing insole is characterized by comprising the following steps of:

S1, preparing a fiber material, and outputting the fiber material into a fiber felt (4) through a carding machine, wherein the thickness of the fiber felt (4) is 20-60 mm;

s2, enabling the fiber felt (4) to pass through a needling machine, wherein needles of the needling machine penetrate into a fiber layer of the fiber felt (4) in a direction perpendicular to the fiber felt (4);

S3, enabling the fiber felt (4) to pass through a needling machine, wherein needles of the needling machine penetrate into a fiber layer of the fiber felt (4) in an inclined direction relative to the fiber felt (4);

s4, carrying out multi-layer paving on the fiber felt (4) subjected to the needling treatment, and carrying out compression molding on the multi-layer paved fiber felt (4) through 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 drying to solidify the polystyrene solution in the fiber felt (4);

s7, ironing the dried fiber felt (4) through a high Wen Tangping machine;

S8, shaping the insole (1) by matching with the fiber felt (4) through a die.

2. The method for preparing the high-efficiency water-permeable puncture-resistant insole of claim 1, wherein in S1, the prepared fiber material comprises at least one of aramid 1414 fiber and nylon 6 fiber.

3. The method for preparing the high-efficiency permeable puncture-proof insole as set forth in claim 1, wherein in S2, the needling depth is 5-7 mm and the needling density is 50-60 needles per square centimeter.

4. The method for preparing the high-efficiency permeable puncture-proof insole according to claim 1, wherein in S3, the puncture direction of the puncture needles and the surface of the fiber felt (4) form 50-70 degrees, the puncture depth is 5-7 mm, and the puncture density is 60-70 needles per square centimeter.

5. The method for preparing the efficient permeable puncture-proof insole according to claim 1, wherein in the step S4, 2-6 layers are paved in a multi-layer mode, the pressure of a press machine is set to be 8-10 megapascals, the pressing time is 15-20 minutes, and the thickness of the pressed fiber felt (4) is 1.5 mm-4 mm.

6. The method for preparing the high-efficiency permeable puncture-proof insole as claimed in claim 1, wherein in S5, the concentration of the polystyrene solution is 15% -18%, the temperature is 55-60 ℃, and the soaking time is 45-60 minutes.

7. The method for preparing the high-efficiency water-permeable puncture-resistant insole as claimed in claim 1, wherein in S6, the drying mode is hot air drying or infrared drying, the drying temperature is 85-95 ℃, and the drying time is 2.5-3 hours.

8. The method for preparing the high-efficiency permeable puncture-proof insole as claimed in claim 1, wherein in S7, the ironing temperature of the Wen Tangping machine is 180-190 ℃ and the ironing time is 1.5-2 minutes.

9. An insole prepared by the preparation method according to any one of claims 1-8, comprising an insole (1) body, wherein the insole (1) is formed by pressing a fiber felt (4), vertical needling fiber structures (2) perpendicular to the surface of the insole (1) are arranged in the insole (1), and the vertical needling fiber structures (2) are arranged in the insole (1) at intervals, and the insole (1) is further provided with oblique needling fiber structures (3) at intervals, wherein an included angle alpha is formed between the oblique needling fiber structures (3) and the surface of the insole (1), 0< alpha is less than or equal to 4 degrees, the oblique needling fiber structures (3) form an inclined channel structure in the insole (1), and the vertical needling fiber structures (2) and the oblique needling fiber structures (3) are intersected or not intersected in the insole (1).