Nurse shoes and preparation method thereof

Abstract

The invention discloses a nurse shoe and a preparation method thereof, and relates to the field of nurse shoes, the nurse shoe comprises an upper, a sole and a detachable insole, the insole is subjected to refined ergonomic design, pressure sinking convex-concave grooves with specific depths are formed in corresponding areas of the first toe, the second toe, the third toe, the fourth toe and the fifth toe and metatarsal bones; supporting pads with matched heights are arranged on the forefoot transverse arch and the foot inner and outer side longitudinal arches respectively, the full-periphery heel cup structure is arranged on the foot heel in a surrounding mode, an all-directional physiological supporting system is formed, the design can be precisely attached to the natural curve of the foot of the human body, pressure of different areas of the sole is evenly dispersed, the local stress peak value of the forefoot, the foot arches and the heel is effectively reduced, and the stability of the human body is improved. The sole is of a three-layer composite structure, the upper supporting layer provides reliable mechanical supporting, the middle buffering layer achieves efficient damping, the moderate-elasticity EVA anti-skid bottom layer enhances the road holding force of the wet and slippery ground through the anti-skid grain design, and the front 1 / 3 bending adaptive area improves the walking flexibility.

Description

Technical Field

[0001] This invention relates to nurse shoe technology, specifically to a nurse shoe and its manufacturing method. Background Technology

[0002] Nurses are indispensable core practitioners in the medical industry. Their daily work is characterized by high intensity and high workload. Throughout the entire process of diagnosis and treatment, nurses need to maintain a standing posture for long periods of time to perform delicate operations such as infusion and medication preparation, vital sign monitoring, and patient observation. At the same time, they also frequently move between different functional areas such as wards, examination rooms, and pharmacies. Their average number of steps per day far exceeds that of ordinary occupational groups. In addition, the hospital working environment is special, with floors mostly made of smooth and hard materials, and there are sudden scenarios such as medical equipment handling and emergency rescue. This places extremely stringent requirements on the shoes worn by nurses every day. They not only need to meet the basic conditions of being comfortable, protective, slip-resistant, and wear-resistant, but also have core performance characteristics such as strong support, lightweight and breathable, shock absorption, and pressure resistance to meet the needs of their profession.

[0003] Existing nurse shoes on the market have significant shortcomings in terms of foot physiological adaptation, pressure balance, and comfort and stability. From a product structure perspective, the insoles of nurse shoes generally adopt a single flat design, which neither conforms to the natural physiological curves of the human foot nor has a targeted mechanical support structure. They cannot achieve a scientific and even distribution of pressure on different pressure areas such as the forefoot, arch, and heel. During long periods of standing and frequent walking, nurses experience continuous pressure concentration on their feet in localized areas, which can easily lead to foot muscle fatigue, soreness, and pain. Over time, this can also induce occupational foot injuries such as flat feet, plantar fasciitis, and heel pain, seriously affecting nurses' work performance and physical health. Summary of the Invention

[0004] The purpose of this invention is to provide a nurse's shoe and its preparation method, in order to solve the problems of most nurse's shoes on the market in terms of physiological fit, pressure balance and stable comfort. Their flat insoles do not conform to the foot curves, have no mechanical support, and cannot evenly distribute the pressure on the sole of the foot, which can easily lead to nurses' foot fatigue, pain and even occupational injury.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a nurse's shoe, comprising an upper, a sole, and a removable insole;

[0006] The upper is made of genuine leather, with an overall raised design that increases the height at the instep and widens the forefoot.

[0007] The sole has a three-layer composite structure, consisting of a support upper layer, a cushioning middle layer, and a medium-elastic EVA anti-slip bottom layer from top to bottom. The front 1 / 3 of the sole is a bending and fitting area, and the sole is reserved with space for the placement of the removable insole.

[0008] The insole surface is covered with odor-resistant and slip-resistant genuine leather. The areas corresponding to the 1st to 5th toes are provided with 2-3mm pressure-reducing grooves. The areas corresponding to the 1st to 5th metatarsal bones are also provided with 2-3mm pressure-reducing grooves. A transverse arch support pad is provided at the forefoot transverse arch with a highest point of 4.52mm. A lateral longitudinal arch support pad is provided at the lateral longitudinal arch with a highest support point of 4.00mm, forming a groove. A sports-type medial longitudinal arch support pad is provided at the medial longitudinal arch with a highest support point of 12-18.00mm at the navicular bone, forming a physiological support zone. A heel cup structure connected to the medial longitudinal arch support pad is provided on the medial side of the heel. A full-circumference heel cup with a height of 12mm is provided around the heel.

[0009] Furthermore, the upper 1 / 3 of the heel of the shoe upper is provided with a sponge edging, and the lower 2 / 3 of the heel is a high-rigidity support section.

[0010] Furthermore, the medium-elastic EVA anti-slip bottom layer of the sole is provided with anti-slip texture, the sole has a mid-heel, and the width of the sole is widened.

[0011] Furthermore, the transverse arch support pad, the outer longitudinal arch support pad, and the sports-type inner longitudinal arch support pad of the insole are all made of TPE, with a Shore hardness of 60-70°, and each support pad is integrally molded with the insole body.

[0012] Furthermore, the surface of the insole is made of top-grain cowhide, with a slightly raised anti-slip texture. The leather is bonded to the insole substrate with an environmentally friendly water-based adhesive, with a bonding strength of ≥2.5N / 25mm. The forefoot area of ​​the upper is made of soft leather with a Shore hardness of 60-70°, and the edge of the upper opening is wrapped with leather.

[0013] Furthermore, the upper and sole are joined by stitching and hot melt adhesive bonding. The stitching thread is high-strength polyester fiber thread with a stitch density of 8-12 stitches / cm. The hot melt adhesive is polyurethane hot melt adhesive with a bonding temperature of 120-140℃. The thickness of the sole bending adaptation area is 60%-70% of the sole thickness.

[0014] A method for preparing a nurse's shoe includes the following steps:

[0015] S1: Preparation of shoe upper material. Select genuine leather material and cut various parts of the shoe upper according to the shoe upper pattern. Pre-form the soft area of ​​the forefoot, the heightened area of ​​the instep, and the segmented area of ​​the heel.

[0016] S2: Sole preparation, including the preparation of a support upper layer, a cushioning middle layer, and a medium-elastic EVA anti-slip bottom layer;

[0017] S3: Insole preparation: The insole substrate is injection molded using a mold, and various pressure-reducing grooves and support pad structures are formed simultaneously. Then, the surface of the insole substrate is polished, environmentally friendly water-based adhesive is applied, and the odor-proof and anti-slip genuine leather is bonded and fixed. After pressure curing, the edges are trimmed.

[0018] S4: Upper forming, the pre-shaped upper parts are sewn together, sponge edging is sewn on the upper 1 / 3 of the heel, and genuine leather edging is applied to the edge of the shoe opening;

[0019] S5: Assemble the finished product: The molded upper and composite sole are fixed together by sewing and hot melt adhesive, the insole is embedded, and the finished nurse shoes are obtained after quality inspections such as appearance inspection, size inspection, flexibility test and anti-slip performance test.

[0020] Further, step S2 includes the following steps:

[0021] S21: Preparation of the upper support layer: obtained by injection molding using PU material;

[0022] S22: Preparation of the buffer middle layer: obtained by compression molding using elastic foam material;

[0023] S23: Preparation of medium elastic EVA anti-slip bottom layer: EVA particles and anti-slip additives are mixed evenly, injection molded and anti-slip texture is pressed, while reserving space for insole placement, and the front 1 / 3 area is thinned to form a bending adaptation area.

[0024] S24: The supporting upper layer, the cushioning middle layer, and the medium elastic EVA anti-slip bottom layer are stacked in sequence, bonded together with hot melt adhesive, and then molded to obtain a composite sole.

[0025] Furthermore, in the preparation of the S3 insole, TPE granules are fed into an injection molding machine and injection molded at 160-180℃ and 80-100MPa pressure. After holding the pressure for 20-30s, the insole is cooled to room temperature and demolded. The injection filling speed of each support pad is 15-20% slower than that of the insole body.

[0026] Furthermore, in the S5 assembled product, polyurethane hot melt adhesive is evenly applied to the connecting surface of the upper and the sole, with an adhesive application amount of 80-120g / ㎡. After the two are bonded together, they are placed in a pressing machine and held under pressure at 120-140℃ and 0.4-0.6MPa for 20-30s, and then allowed to cool naturally to room temperature.

[0027] Compared with existing technologies, the present invention provides a nurse's shoe and its manufacturing method. Through refined ergonomic design of the insole, pressure-reducing grooves of specific depth are set in the corresponding areas of the 1st to 5th toes and metatarsals. Height-adaptive support pads are respectively configured in the transverse arch of the forefoot and the medial and lateral longitudinal arches of the foot, and a full-circumference heel cup structure is set around the heel to form a comprehensive physiological support system. This design can accurately conform to the natural curve of the human foot, evenly distribute the pressure in different areas of the sole, effectively reduce the local peak force on the forefoot, arch, and heel, reduce muscle fatigue and soreness, and prevent occupational foot injuries such as flat feet, plantar fasciitis, and heel pain from the root, ensuring the foot health of nurses during long-term work and improving work comfort and endurance.

[0028] Secondly, through multi-structure collaborative optimization, the shortcomings of existing nurse shoes in terms of stability, slip resistance, and durability have been addressed. The upper is made of genuine leather and has been heightened and widened. Combined with the segmented sponge edging and high-rigidity support design at the heel, it ensures both a comfortable fit and improved ankle support and stability. The sole adopts a three-layer composite structure: the upper support layer provides reliable mechanical support, the middle cushioning layer achieves efficient shock absorption, and the medium-elastic EVA anti-slip bottom layer enhances grip on wet surfaces with its anti-slip texture design. The front 1 / 3 bending adaptation area improves walking flexibility. The upper and sole are connected by a composite method of stitching and hot melt adhesive bonding. Combined with high-specification material selection and precision manufacturing process, the structural strength and wear resistance of the shoe are further improved. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0030] Figure 1 A flowchart illustrating the manufacturing process of nurse shoes provided in an embodiment of the present invention;

[0031] Figure 2 A flowchart illustrating the manufacturing process of a shoe sole provided in an embodiment of the present invention. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] To address the shortcomings of most nurses' shoes on the market, such as poor physiological fit, uneven pressure distribution, and inadequate stability and comfort, and the fact that their flat insoles do not conform to the foot's curves and lack mechanical support, failing to evenly distribute pressure on the soles of the feet and easily leading to foot fatigue, pain, and even occupational injuries for nurses, please refer to [the relevant documentation / reference]. Figure 1 and Figure 2 The following preferred technical solutions are provided.

[0034] A nurse's shoe includes an upper, a sole, and a removable insole. The upper is made of genuine leather and features an overall raised design. The instep height is accommodated for individuals with different instep heights, preventing pressure on the instep. The widened forefoot area ensures ample room for movement and enhances comfort. The forefoot area is made of soft genuine leather to ensure forefoot suppleness. The heel features a segmented structure: the upper 1 / 3 is padded with foam to improve heel flexibility and comfort, while the lower 2 / 3 provides high-rigidity support to ensure heel stability and prevent heel swaying during walking. The sole has a three-layer composite structure: from top to bottom, a supportive upper layer, a cushioning middle layer, and a moderately elastic EVA anti-slip outsole. The upper support layer uses PU material for stable support, while the middle cushioning layer uses elastic foam material to effectively absorb the impact of walking and reduce foot fatigue. The medium-elastic EVA anti-slip bottom layer has good elasticity and anti-slip performance, and together with the surface anti-slip texture, it can improve anti-slip safety on wet hospital floors. The sole features a mid-heel design and a widened sole width, balancing a neat appearance with overall shoe stability. The front 1 / 3 of the sole is a bending adaptation area, which is thinned to ensure that the sole bends precisely at the metatarsophalangeal joint when pushing off the ground, conforming to human walking mechanics. The sole has space reserved for a removable insole to ensure that the insole does not take up foot space and ensures wearing comfort.

[0035] The core innovative structure features a removable insole covered with odor-resistant and slip-resistant genuine leather, enhancing breathability, odor control, and slip resistance. Designed according to the physiological structure of the foot, it includes multiple adaptation zones: 2-3mm pressure-reducing grooves corresponding to the 1st to 5th toes and 2-3mm pressure-reducing grooves corresponding to the 1st to 5th metatarsals, ensuring even pressure distribution between the toes and forefoot during standing and walking; a transverse arch support pad at the forefoot transverse arch (4.52mm at its highest point) promotes forefoot push-off, conserving energy and reducing pressure on the forefoot transverse arch during the middle and late stages of support; and a lateral longitudinal arch support pad at the lateral longitudinal arch (highest support point)... The 4.00mm point and the resulting groove can reduce pressure on the lateral longitudinal arch and improve foot stability; the sports-type medial longitudinal arch support pad (the highest support point near the navicular bone is 12-18.00mm) and the resulting physiological support area at the medial longitudinal arch of the foot can reduce pressure on the medial area of ​​the foot when standing and walking, further improving foot stability; the heel cup structure connecting the medial side of the heel to the medial longitudinal arch support pad can produce a 5º physiological inversion when the heel is flat, which is beneficial to the physiological alignment of the subtalar joint; the 12mm high full-circumference heel cup around the heel can improve heel support and distribute pressure on the soft tissues around the heel.

[0036] The removable insole's transverse arch support pad, lateral longitudinal arch support pad, and sports-type medial longitudinal arch support pad are all made of flexible thermoplastic elastomer (TPE) with a Shore hardness of 60-70°. This provides stable support without causing pressure. Each support pad is integrally molded with the insole body, enhancing structural stability and lifespan. The odor-resistant and slip-resistant genuine leather on the insole surface is made of top-grain cowhide with a slightly raised anti-slip texture, further enhancing the anti-slip effect. The genuine leather is bonded to the insole base material with environmentally friendly water-based adhesive, with a bonding strength ≥2.5N / 25mm, ensuring a strong bond and preventing the genuine leather from falling off.

[0037] The shoe upper features genuine leather trim around the opening to prevent chafing and improve comfort. The connection between the upper and sole utilizes a combination of stitching and hot-melt adhesive bonding. High-strength polyester thread with a stitch density of 8-12 stitches / cm ensures stability, while polyurethane hot-melt adhesive at 120-140℃ further enhances strength and prevents delamination. The thickness of the sole's bending adaptation area is 60-70% of the thickness of other areas, allowing for precise control of the bending position and ensuring compliance with human walking biomechanics.

[0038] Example 1:

[0039] A nurse's shoe includes an upper, a sole, and a removable insole. The upper is made of full-grain genuine leather, with an overall height increase of 5mm, an 8mm increase at the instep, and a 6mm increase in width at the forefoot. The genuine leather in the forefoot area has a Shore hardness of 65°. The upper 1 / 3 of the heel is edged with 5mm thick sponge, and the lower 2 / 3 of the heel is a high-rigidity support section. The sole has a three-layer composite structure, consisting of a PU support upper layer, an elastic foam cushioning middle layer, and a medium-elastic EVA anti-slip bottom layer. The sole features a mid-heel design (3cm heel height), and the sole width is increased by 4mm. The thickness of the front 1 / 3 bending adaptation area is 65% of the thickness of the other areas of the sole. The sole has a reserved space for insole placement, with a thickness of 12mm. The removable insole is covered with a full-grain protective layer. The insole is made of non-slip genuine leather with a slightly raised non-slip texture. The base material is made of flexible thermoplastic elastomer (TPE) with a Shore hardness of 65°. The pressure-reducing grooves and support pads are integrally molded with the base material. There are 2.5mm pressure-reducing grooves in the areas corresponding to the 1st to 5th toes and 2.5mm pressure-reducing grooves in the areas corresponding to the 1st to 5th metatarsals. The highest point of the transverse arch support pad is 4.52mm, the highest support point of the lateral longitudinal arch support pad is 4.00mm, and the highest support point of the medial longitudinal arch support pad near the navicular bone is 15mm. The heel cup height is 12mm. The upper and sole are made of high-strength polyester fiber thread and bonded with polyurethane hot melt adhesive. The stitch density is 10 stitches / cm and the bonding temperature is 130℃.

[0040] The above-mentioned method for preparing nurse shoes includes the following steps:

[0041] Step 1: Preparation of upper material: Select full-grain genuine leather material, cut the upper parts according to the design pattern, soften the genuine leather in the forefoot area, and pre-form the instep height increase, forefoot width increase and heel segmentation areas.

[0042] Step 2, sole preparation: The PU support upper layer is injection molded; the elastic foam cushioning middle layer is molded; the medium elastic EVA anti-slip bottom layer is injection molded by mixing EVA particles with anti-slip additives, pressing anti-slip patterns, leaving space for a 12mm thick insole, and thinning the front 1 / 3 area to 65% of the thickness of other areas; the three-layer structure is coated with polyurethane hot melt adhesive, composite molded, and cooled to obtain the composite sole;

[0043] Step 3: Preparation of removable insoles: Thermoplastic elastomer (TPE) granules are fed into an injection molding machine and injection molded into insole substrates at 170℃ and 90MPa pressure. The filling speed of each support pad is 18% slower than that of the main body. After holding the pressure for 25 seconds, the insole is demolded. The surface of the substrate is polished and cleaned, coated with environmentally friendly water-based adhesive, and then bonded with top-layer anti-odor and anti-slip genuine leather. The substrate is then cured under pressure of 0.4MPa for 35 minutes, and the edges are trimmed.

[0044] Step 4: Upper shaping: The upper parts are sewn into shape, the upper 1 / 3 of the heel is sewn with sponge edging, and the shoe opening is edged with genuine leather;

[0045] Step 5: Assemble the finished product: Apply glue to the upper and sole, with an glue application rate of 100g / ㎡. Hold the glue at 130℃ and 0.5MPa pressure for 25s. After cooling, insert the insole. The finished product is obtained after quality inspection.

[0046] Example 2:

[0047] A nurse's shoe includes an upper, a sole, and a removable insole. The upper is made of full-layer genuine leather, with an overall height increase of 4mm, an instep increase of 6mm, and a forefoot increase of 5mm. The genuine leather in the forefoot area has a Shore hardness of 60°. The upper 1 / 3 of the heel is edged with 4mm thick sponge, and the lower 2 / 3 of the heel is a high-rigidity support section. The sole has a three-layer composite structure, consisting of a PU support upper layer, an elastic foam cushioning middle layer, and a medium-elastic EVA anti-slip bottom layer. The sole features a mid-heel design (heel height 2.5cm), a 3mm wider sole, and the thickness of the front 1 / 3 bending adaptation area is 60% of the thickness of the other areas of the sole. The sole has space reserved for insole placement, with a thickness of 11mm. The removable insole is covered with two layers of odor-resistant and slip-resistant genuine leather. The insole base material is made of thermoplastic elastomer (TPE) with a Shore hardness of 60°. The pressure-reducing grooves and support pads are integrally molded with the base material. There are 2mm pressure-reducing grooves in the areas corresponding to the 1st to 5th toes and 2mm pressure-reducing grooves in the areas corresponding to the 1st to 5th metatarsals. The highest point of the transverse arch support pad is 4.52mm, the highest support point of the lateral longitudinal arch support pad is 4.00mm, the highest support point of the medial longitudinal arch support pad near the navicular bone is 12mm, and the heel cup height is 12mm. The upper and sole are made of high-strength polyester fiber thread and bonded with polyurethane hot melt adhesive. The stitch density is 8 stitches / cm, and the bonding temperature is 120℃.

[0048] The above-mentioned method for preparing nurse shoes includes the following steps:

[0049] Step 1: Preparation of shoe upper material: Select full-layer genuine leather material, cut the shoe upper parts according to the design pattern, soften the genuine leather in the forefoot area, and pre-form the instep height increase, forefoot width increase and heel segmentation areas.

[0050] Step 2, Sole Preparation: The PU support upper layer is injection molded; the elastic foam cushioning middle layer is molded; the medium-elastic EVA anti-slip bottom layer is injection molded by mixing EVA particles with anti-slip additives, pressing on anti-slip patterns, leaving space for an 11mm thick insole, and thinning the front 1 / 3 area to 60% of the thickness of other areas; the three-layer structure is coated with polyurethane hot melt adhesive, composite molded, and cooled to obtain the composite sole;

[0051] Step 3: Preparation of removable insoles: Thermoplastic elastomer (TPE) granules are fed into an injection molding machine and injection molded into insole substrates at 160℃ and 80MPa pressure. The filling speed of each support pad is 15% slower than that of the main body. After holding the pressure for 20 seconds, the insole is demolded. The surface of the substrate is polished and cleaned, coated with environmentally friendly water-based adhesive, and two layers of odor-proof and non-slip genuine leather are bonded together. The substrate is then cured under pressure of 0.3MPa for 30 minutes, and the edges are trimmed.

[0052] Step 4: Upper shaping: The upper parts are sewn into shape, the upper 1 / 3 of the heel is sewn with sponge edging, and the shoe opening is edged with genuine leather;

[0053] Step 5: Assemble the finished product: Apply glue to the upper and sole, with an glue application rate of 80g / ㎡. Hold the glue at 120℃ and 0.4MPa for 20 seconds. After cooling, insert the insole. The finished product is obtained after quality inspection.

[0054] Example 3:

[0055] A nurse's shoe includes an upper, a sole, and a removable insole. The upper is made of full-grain genuine leather, with an overall height increase of 6mm, a 10mm increase at the instep, and a 7mm increase in width at the forefoot. The forefoot area has a Shore hardness of 70°. The upper 1 / 3 of the heel is edged with 6mm thick sponge, and the lower 2 / 3 is a high-rigidity support section. The sole has a three-layer composite structure, consisting of a PU support upper layer, an elastic foam cushioning middle layer, and a medium-elastic EVA anti-slip bottom layer. The sole features a mid-heel design (3.5cm heel height), is 5mm wider, and the thickness of the front 1 / 3 bending adaptation area is 70% of the thickness of the rest of the sole. The sole has a 13mm thick space reserved for an insole. The insole is removable. The upper is covered with top-layer odor-resistant and slip-resistant genuine leather with a slightly raised anti-slip texture. The insole base material is made of thermoplastic elastomer (TPE) with a Shore hardness of 70°. The pressure-reducing grooves and support pads are integrally molded with the base material. There are 3mm pressure-reducing grooves in the areas corresponding to the 1st to 5th toes and 3mm pressure-reducing grooves in the areas corresponding to the 1st to 5th metatarsals. The highest point of the transverse arch support pad is 4.52mm, the highest support point of the lateral longitudinal arch support pad is 4.00mm, and the highest support point of the medial longitudinal arch support pad near the navicular bone is 18mm. The heel cup height is 12mm. The upper and sole are made of high-strength polyester fiber thread and bonded with polyurethane hot melt adhesive. The stitch density is 12 stitches / cm, and the bonding temperature is 140℃.

[0056] The above-mentioned method for preparing nurse shoes includes the following steps:

[0057] Step 1: Preparation of upper material: Select full-grain genuine leather material, cut the upper parts according to the design pattern, soften the genuine leather in the forefoot area, and pre-form the instep height increase, forefoot width increase and heel segmentation areas.

[0058] Step 2, sole preparation: The PU support upper layer is injection molded; the elastic foam cushioning middle layer is molded; the medium elastic EVA anti-slip bottom layer is injection molded by mixing EVA particles with anti-slip additives, pressing anti-slip patterns, leaving space for a 13mm thick insole, and thinning the front 1 / 3 area to 70% of the thickness of other areas; the three-layer structure is coated with polyurethane hot melt adhesive, composite molded, and cooled to obtain the composite sole;

[0059] Step 3: Preparation of removable physiologically adapted insoles: Thermoplastic elastomer (TPE) granules are fed into an injection molding machine and injection molded into insole substrates at 180℃ and 100MPa pressure. The filling speed of each support pad is 20% slower than that of the main body. After holding the pressure for 30 seconds, the insole is demolded. The surface of the substrate is polished and cleaned, coated with environmentally friendly water-based adhesive, and then bonded with top-layer anti-odor and anti-slip genuine leather. The substrate is then cured under pressure of 0.5MPa for 40 minutes, and the edges are trimmed.

[0060] Step 4: Upper shaping: The upper parts are sewn into shape, the upper 1 / 3 of the heel is sewn with sponge edging, and the shoe opening is edged with genuine leather;

[0061] Step 5: Assemble the finished product: Apply glue to the upper and sole, with an glue application rate of 120g / ㎡. Hold the glue at 140℃ and 0.6MPa for 30 seconds. After cooling, insert the insole. The finished product is obtained after quality inspection.

[0062] Comparison (commercially available ordinary nurse shoes):

[0063] We selected a commercially available nurse's shoe that meets the QB / T2955-2017 "Casual Shoes" standard as a comparison. Its main parameters are as follows: the upper is made of artificial leather, the forefoot has no widening design, and the heel is a one-piece structure; the sole is made of single-layer EVA material, without a bending adaptation area design, and the heel height is 2.5cm; the insole is a regular flat non-woven insole without a physiological adaptation support structure; the upper and sole are bonded using a single hot melt adhesive bonding process.

[0064] Performance testing:

[0065] The multi-dimensional core performances of the products of Examples 1-3 and the comparative products were detected respectively, and each detection item was carried out in accordance with the corresponding national standards. The specific detection methods and judgment logics are as follows: Wet / dry static friction coefficient (anti-slip performance): Refer to the "Test Method for Static Anti-slip Performance of Footwear" (HG / T 3780-2005), measure the static friction coefficient of the product on the wet / dry ceramic tile surface. The higher the value, the better the anti-slip performance. Among them, wet method ≥ 0.7 and dry method ≥ 0.8 are up to standard; Flexing cut growth length: Refer to the "Casual Shoes" (QB / T 2955-2017), measure the cut growth length after 40,000 flexing tests, and record whether there is glue opening or surface cracking. The shorter the cut growth length and no glue opening or surface cracking indicate better flexing durability, and no serious glue opening or surface cracking is qualified; Foot pressure distribution (maximum pressure on forefoot / arch / rear heel): Refer to the "Test Method for Foot Pressure Distribution of Whole Footwear" (GB / T 3903.61-2021), measure the maximum pressure of each part through a 4-hour standing and walking simulation test. The lower the value, the more balanced the pressure distribution, and meeting the ergonomic pressure distribution requirements is up to standard; DIN abrasion loss of the sole: Refer to the "Determination of Abrasion Resistance of Rubber and Plastics (Rotary Drum Abrasion Machine Method)" (GB / T 9867-2008), measure the abrasion loss resistance of the sole. The lower the value, the better the abrasion resistance. ≤ 95 mm³ (required by JXUB / S1228-2019 "Specification for White Leather Shoes") is up to standard. The specific detection results are shown in the following table:

[0066] Test Project Example 1 Example 2 Example 3 Comparative Example Standard requirements wet static friction coefficient 0.78 0.73 0.82 0.62-0.65 ≥0.7 Dry static friction coefficient 0.89 0.85 0.93 0.75-0.78 ≥0.8 Bending resistance kerf extension length (mm) 2.3 2.7 2.0 4.3-5.1 No severe delamination or cracking Maximum pressure on the forefoot (kPa) 242 265 230 312-330 Ergonomic Arch pressure (kPa) 88 102 85 156-170 Ergonomic Maximum pressure on the heel (kPa) 293 309 282 368-382 Ergonomic DIN abrasion allowance for shoe soles (mm³) 78 85 72 105 ≤95 (JXUB / S1228-2019)

[0067] The products of each embodiment of the present invention are significantly superior to the comparative examples in key indicators such as anti-slip performance (wet static friction coefficient ≥ 0.73), flexing performance (cut growth ≤ 2.7 mm after 40,00 flexing tests), and foot pressure balance (pressure on forefoot / arch / rear heel), and all meet the requirements of relevant national / industry standards. Among them, Example 3 uses higher-specification top-layer genuine leather and TPE hardness parameters, and shows the best performance in anti-slip, wear resistance and pressure support; Example 2 uses second-layer genuine leather, taking into account performance and cost, and is suitable for mass promotion. Through the collaborative design of the full-genuine leather upper, three-layer composite sole and TPE material insole, the present invention effectively solves the problems of poor physiological adaptation, uneven pressure and insufficient comfort and stability existing in the ordinary nurse shoes of the comparative examples.

[0068] Only some exemplary embodiments of the present invention have been described by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A nurse's shoe, characterized in that, This includes the upper, sole, and removable insole; The upper is made of genuine leather, with an overall raised design that increases the height at the instep and widens the forefoot. The sole has a three-layer composite structure, consisting of a support upper layer, a cushioning middle layer, and a medium-elastic EVA anti-slip bottom layer from top to bottom. The front 1 / 3 of the sole is a bending and fitting area, and the sole is reserved with space for the placement of the removable insole. The insole surface is covered with odor-resistant and slip-resistant genuine leather. The areas corresponding to the 1st to 5th toes are provided with 2-3mm pressure-reducing grooves. The areas corresponding to the 1st to 5th metatarsal bones are also provided with 2-3mm pressure-reducing grooves. A transverse arch support pad is provided at the forefoot transverse arch with a highest point of 4.52mm. A lateral longitudinal arch support pad is provided at the lateral longitudinal arch with a highest support point of 4.00mm, forming a groove. A sports-type medial longitudinal arch support pad is provided at the medial longitudinal arch with a highest support point of 12-18.00mm at the navicular bone, forming a physiological support zone. A heel cup structure connected to the medial longitudinal arch support pad is provided on the medial side of the heel. A full-circumference heel cup with a height of 12mm is provided around the heel.

2. The nurse's shoe according to claim 1, characterized in that: The upper heel has a sponge edging at the top 1 / 3 and a high-rigidity support section at the bottom 2 / 3.

3. A nurse's shoe according to claim 1, characterized in that: The sole has a medium-elastic EVA anti-slip bottom layer with anti-slip texture, the sole has a mid-heel, and the width of the sole has been widened.

4. A nurse's shoe according to claim 1, characterized in that: The transverse arch support pad, outer longitudinal arch support pad, and sports-type inner longitudinal arch support pad of the insole are all made of TPE with a Shore hardness of 60-70°, and each support pad is integrally molded with the insole body.

5. A nurse's shoe according to claim 1, characterized in that: The surface of the insole is made of top-grain cowhide, which is odor-resistant and slip-resistant. The surface of the leather has a slightly raised anti-slip texture. The leather and the insole base material are bonded and fixed with environmentally friendly water-based adhesive, with a bonding strength of ≥2.5N / 25mm. The forefoot area of ​​the shoe upper is made of soft leather with a Shore hardness of 60-70°. The edge of the shoe upper opening is wrapped with leather.

6. A nurse's shoe according to claim 1, characterized in that: The upper and sole are joined by stitching and hot melt adhesive bonding. The stitching thread is high-strength polyester fiber thread with a stitch density of 8-12 stitches / cm. The hot melt adhesive is polyurethane hot melt adhesive with a bonding temperature of 120-140℃. The thickness of the sole bending adaptation area is 60%-70% of the sole thickness.

7. A method for preparing a nurse's shoe according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Preparation of shoe upper material. Select genuine leather material and cut various parts of the shoe upper according to the shoe upper pattern. Pre-form the soft area of ​​the forefoot, the heightened area of ​​the instep, and the segmented area of ​​the heel. S2: Sole preparation, including the preparation of a support upper layer, a cushioning middle layer, and a medium-elastic EVA anti-slip bottom layer; S3: Insole preparation: The insole substrate is injection molded using a mold, and various pressure-reducing grooves and support pad structures are formed simultaneously. Then, the surface of the insole substrate is polished, environmentally friendly water-based adhesive is applied, and the odor-proof and anti-slip genuine leather is bonded and fixed. After pressure curing, the edges are trimmed. S4: Upper forming, the pre-shaped upper parts are sewn together, sponge edging is sewn on the upper 1 / 3 of the heel, and genuine leather edging is applied to the edge of the shoe opening; S5: Assemble the finished product: The molded upper and composite sole are fixed together by sewing and hot melt adhesive, the insole is embedded, and the finished nurse shoes are obtained after quality inspections such as appearance inspection, size inspection, flexibility test and anti-slip performance test.

8. The method for preparing a nurse's shoe according to claim 7, characterized in that: Step S2 includes the following steps: S21: Preparation of the upper support layer: obtained by injection molding using PU material; S22: Preparation of the buffer middle layer: obtained by compression molding using elastic foam material; S23: Preparation of medium elastic EVA anti-slip bottom layer: EVA particles and anti-slip additives are mixed evenly, injection molded and anti-slip texture is pressed, while reserving space for insole placement, and the front 1 / 3 area is thinned to form a bending adaptation area. S24: The supporting upper layer, the cushioning middle layer, and the medium elastic EVA anti-slip bottom layer are stacked in sequence, bonded together with hot melt adhesive, and then molded to obtain a composite sole.

9. The method for preparing a nurse's shoe according to claim 7, characterized in that: In the preparation of the S3 insole, TPE granules are fed into an injection molding machine and injection molded at 160-180℃ and 80-100MPa pressure. After holding the pressure for 20-30s, the insole is cooled to room temperature and demolded. The injection filling speed of each support pad is 15-20% slower than that of the insole body.

10. A method for preparing a nurse's shoe according to claim 7, characterized in that: In the S5 assembly, polyurethane hot melt adhesive is evenly applied to the connecting surface of the upper and the sole, with an adhesive application amount of 80-120g / ㎡. After the two are bonded together, they are placed in a pressing machine and held under pressure at 120-140℃ and 0.4-0.6MPa for 20-30s, and then allowed to cool naturally to room temperature.

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