Insole made of environment-friendly and recyclable bio-based material

Abstract

The invention discloses a bio-based material insole capable of being utilized in an environment-friendly mode. The bio-based material insole comprises a linen fiber cloth base layer. A towel gourd fiber layer is sewed in the linen fiber cloth base layer, and a bearing layer and a deodorization layer sewed with the top surface of the bearing layer are sewed at the top of the linen fiber cloth base layer; through the arrangement of the linen fiber cloth base layer, the moisture absorption breathable layer, the antibacterial composite layer and the manufacturing method, the advantages of being good in environmental protection property and capable of being degraded are achieved, meanwhile, the manufactured insole further has the advantages of being antibacterial, deodorant, breathable and dehumidified, the antibacterial activity can be improved based on integration of the materials, and the antibacterial effect is good. The far infrared emissivity is higher than that in the prior art, meanwhile, the water absorption is high, the composite multiple functions of antibiosis, deodorization, ventilation and dehumidification are achieved, the moisture absorption and ventilation, antibiosis and deodorization effects can be achieved through cooperation between the moisture absorption and ventilation layer and the antibacterial composite layer, and multi-function cooperation is achieved.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly materials technology, specifically to an environmentally friendly bio-based insole. Background Technology

[0002] Insoles are functional or decorative accessories placed inside the sole of shoes, primarily used to improve comfort, adjust the space inside the shoe, improve foot health, or enhance aesthetics. Bio-based materials, on the other hand, refer to materials manufactured using renewable biomass (including the contents and residues of crops, trees, and other plants and animals) through biological, chemical, and physical means. Bio-based materials are a new type of material manufactured using renewable biomass, including grains, legumes, straw, bamboo and wood powder, and animal fur waste, through biological, chemical, and physical methods. These mainly include bio-based platform compounds, biomass functional polymers, functional sugar products, wood-based engineering materials, and leather-based service materials, possessing characteristics of being green, environmentally friendly, using renewable raw materials, and being biodegradable.

[0003] Existing insoles have limited functionality, often providing only a single benefit. Furthermore, the raw materials used are mostly difficult or non-biodegradable, and the production process of these materials also generates pollution and waste, failing to achieve environmental protection. As a result, the insoles do not provide a comprehensive effect on the feet during use. Summary of the Invention

[0004] The purpose of this invention is to provide an environmentally friendly bio-based insole that has the advantages of multiple functions, including comprehensive functionality and effects. At the same time, the materials used are all environmentally friendly and easily degradable, which increases environmental friendliness without causing pollution, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an environmentally friendly bio-based insole, comprising a flax fiber fabric base layer;

[0006] The flax fiber fabric base layer is stitched with a loofah fiber layer inside, and the top of the flax fiber fabric base layer is stitched with a supporting layer and a deodorizing layer stitched to the top surface of the supporting layer.

[0007] The top of the deodorizing layer is provided with an antibacterial composite layer, the antibacterial composite layer comprising:

[0008] A first antibacterial layer is disposed on the top surface of the deodorizing layer. A second antibacterial layer and a first antibacterial and breathable composite layer connected to the second antibacterial layer are disposed on the top surface of the first antibacterial and breathable composite layer. A second antibacterial and breathable composite layer is disposed on the top surface of the first antibacterial and breathable composite layer.

[0009] For example, the carrier layer includes;

[0010] A first flax fiber layer is sewn onto the top surface of the flax fiber fabric base layer and the loofah fiber layer, and a wool fiber layer is sewn into the interior of the first flax fiber layer.

[0011] For example, the deodorizing layer includes;

[0012] The second flax fiber layer is sewn onto the top surface of the first flax fiber layer and the wool fiber layer, and a carbon base layer is sewn into the interior of the second flax fiber layer.

[0013] For example, the first antibacterial layer includes;

[0014] A chitin fiber layer is sewn onto the top surface of the second flax fiber layer, and a hemp fiber layer is sewn onto the top surface of the chitin fiber layer.

[0015] For example, both the chitin fiber layer and the hemp fiber layer are made of blended fabric, and the chitin fiber layer contains 80% chitin fiber and 20% hemp fiber.

[0016] The hemp fiber layer contains 80% hemp fiber and 20% chitin fiber.

[0017] For example, the second antibacterial layer includes;

[0018] A chitosan fiber layer is sewn onto the top surface of the hemp fiber layer, and a kapok fiber layer is sewn onto the top surface of the chitosan fiber layer.

[0019] For example, both the chitosan fiber layer and the kapok fiber layer are made of a blend, wherein the chitosan fiber layer contains 80% chitosan fiber and 20% kapok fiber;

[0020] The kapok fiber layer contains 80% kapok fiber and 20% chitosan fiber.

[0021] For example, the first antibacterial and breathable composite layer includes;

[0022] Polylactic acid fiber is sewn onto the top surface of the kapok fiber layer, and the top surface of the polylactic acid fiber is sewn with plant extract modified fiber.

[0023] For example, the second antibacterial and breathable composite layer includes;

[0024] A bamboo fiber layer is sewn onto the top surface of the plant extract modified fiber, and a pure cotton fabric layer is sewn onto the top surface of the bamboo fiber layer.

[0025] For example, it is made by the following method;

[0026] Step 1: Base layer preparation. Take flax fibers and weave them into flax fiber fabric with a thickness of 2-3mm to serve as the base layer of the flax fiber fabric.

[0027] After washing and drying, the loofah fibers are combed into a web to form a loofah fiber layer with a thickness of 1-1.5mm. The loofah fiber layer is then sewn into the base layer of flax fiber fabric using a flat stitch technique with a stitch spacing of 5-8mm to ensure that the loofah fiber layer is flat and fixed.

[0028] Step 2, preparation and composite of the carrier layer: take flax fibers and spin them into a first flax fiber layer with a thickness of 1-2 mm, and take wool fibers and comb them into a wool fiber layer with a thickness of 0.8-1.2 mm;

[0029] The wool fiber layer is laid flat inside the first flax fiber layer and fixed with an overlock stitching process to form a support layer. The support layer is then sewn to the top surface of the base layer obtained in step 1 using a flat stitching process, leaving a 0.5mm allowance at the sewn edge.

[0030] Step 3, preparation and composite of deodorizing layer: take flax fiber and weave it into a second flax fiber layer with a thickness of 1-1.5mm. Take bamboo carbon base and plant fiber and press them together to form a carbon base layer with a thickness of 2-25mm. Embed the carbon base layer into the second flax fiber layer and seal it with a blind seam process to form a deodorizing layer. Sew the deodorizing layer to the top surface of the supporting layer, with the sewing line aligned with the edge of the supporting layer.

[0031] Step 4, Preparation and lamination of the antibacterial composite layer, preparation of the first antibacterial layer:

[0032] The chitosan fiber layer is woven with a blend of 80% chitosan fiber and 20% hemp fiber to form a chitosan fiber layer with a thickness of 0.6-0.8 mm. The chitosan fiber layer and the hemp fiber layer are then sewn together and attached to the top surface of the deodorizing layer.

[0033] Preparation of the second antibacterial layer 32: Chitosan fiber layer with a thickness of 0.5-0.7 mm is spun by blending 80% chitosan fiber and 20% kapok fiber. Kapok fiber layer with a thickness of 0.5-0.7 mm is spun by blending 80% kapok fiber and 20% chitosan fiber. Chitosan fiber layer and kapok fiber layer are then stacked and sewn onto the top surface of the first antibacterial layer using a serrated stitching process.

[0034] Preparation of the first antibacterial and breathable composite layer:

[0035] Polylactic acid fibers are spun into a polylactic acid fiber layer with a thickness of 0.4-0.6 mm. Plant extracts and cellulose fibers are combined through impregnation and drying processes to form a plant extract modified fiber layer. The polylactic acid fiber layer and the plant extract modified fiber layer are flat-sewn together and sewn onto the top surface of the second antibacterial layer.

[0036] Preparation of the second antibacterial and breathable composite layer:

[0037] Bamboo fiber is spun into a bamboo fiber layer with a thickness of 0.5-0.8mm, and pure cotton fiber is spun into a pure cotton fabric layer with a thickness of 0.3-0.5mm. The bamboo fiber layer and the pure cotton fabric layer are stacked together and sewn onto the top surface of the first antibacterial and breathable composite layer using an edge-sealing process.

[0038] Step 5: Overall molding. Trim the edges of the composite multi-layer structure to ensure consistent dimensions. Use hot pressing for shaping at a temperature of 200-248℃, a pressure of 2-2.5MPa, and a time of 7-120min to enhance the interlayer bonding force. Then, conduct quality inspection to check the firmness of the stitching of each layer and ensure there is no delamination. This yields an environmentally friendly bio-based insole.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] This invention achieves the advantages of good environmental protection and biodegradability through the design of a flax fiber fabric base layer, a moisture-absorbing and breathable layer, and an antibacterial composite layer. The resulting insole also possesses antibacterial, deodorizing, breathable, and moisture-wicking properties. The integration of these materials enhances antibacterial activity and results in a higher far-infrared emissivity than existing technologies, along with high water absorption. The combination of antibacterial, deodorizing, breathable, and moisture-wicking properties creates a multifunctional composite. The synergy between the moisture-absorbing and breathable layer and the antibacterial composite layer ensures moisture absorption, breathability, antibacterial properties, and deodorization, achieving a multifunctional synergy.

[0041] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of the present invention;

[0043] Figure 2 This is a schematic diagram showing the disassembled structure of the moisture-absorbing and breathable layer of the present invention;

[0044] Figure 3 This is a schematic diagram showing the disassembled structure of the antibacterial composite layer of the present invention;

[0045] Figure 4 This is a schematic diagram of the disassembled structure of the first antibacterial layer of the present invention;

[0046] Figure 5 This is a schematic diagram of the split structure of the second antibacterial layer of the present invention;

[0047] Figure 6 This is a schematic diagram showing the disassembled structure of the first antibacterial and breathable composite layer of the present invention;

[0048] Figure 7 This is a schematic diagram showing the disassembled structure of the second antibacterial and breathable composite layer of the present invention.

[0049] In the diagram: 1. Flax fiber base layer; 2. Moisture-wicking and breathable layer; 21. Loofah fiber layer; 22. First flax fiber layer; 23. Wool fiber layer; 24. Second flax fiber layer; 25. Carbon base layer; 3. Antibacterial composite layer; 31. First antibacterial layer; 311. Chitosan fiber layer; 312. Hemp fiber layer; 32. Second antibacterial layer; 321. Chitosan fiber layer; 322. Kapok fiber layer; 33. First antibacterial and breathable composite layer; 331. Polylactic acid fiber; 332. Plant extract modified fiber; 34. Second antibacterial and breathable composite layer; 341. Bamboo fiber layer; 342. Pure cotton fabric layer. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] This invention provides an environmentally friendly bio-based insole, comprising a flax fiber fabric base layer 1;

[0052] The flax fiber base layer 1 is sewn with a loofah fiber layer 21 inside, and the top of the flax fiber base layer 1 is sewn with a supporting layer and a deodorizing layer sewn to the top surface of the supporting layer.

[0053] An antibacterial composite layer 3 is provided on the top of the deodorizing layer, the antibacterial composite layer 3 including:

[0054] A first antibacterial layer 31 is disposed on the top surface of the deodorizing layer. A second antibacterial layer 32 and a first antibacterial and breathable composite layer 33 connected to the second antibacterial layer 32 are disposed on the top surface of the first antibacterial and breathable composite layer 33. A second antibacterial and breathable composite layer 34 is disposed on the top surface of the first antibacterial and breathable composite layer 33.

[0055] Preferred;

[0056] like Figure 2 As shown, the supporting layer includes;

[0057] The first flax fiber layer 22 is sewn to the top surface of the flax fiber fabric base layer 1 and the loofah fiber layer 21, and the inside of the first flax fiber layer 22 is sewn with a wool fiber layer 23.

[0058] The loofah fiber used mainly functions to absorb sweat, breathe, and prevent odor in practical applications, while its natural properties help improve foot health.

[0059] The wool fibers contain natural keratin, which has antibacterial and deodorizing properties. At the same time, its microporous structure can quickly expel sweat and moisture from the feet, preventing bacteria from growing in a stuffy environment. The material is soft and elastic, which can closely conform to the curves of the sole of the foot, providing even support and relieving walking pressure. It is not easily deformed with long-term use and has strong durability.

[0060] further;

[0061] like Figure 2 As shown, the deodorizing layer includes;

[0062] The second flax fiber layer 24 is sewn to the top surface of the first flax fiber layer 22 and the wool fiber layer 23, and a carbon base layer 25 is sewn inside the second flax fiber layer 24.

[0063] The carbon-based material is made by calcining bamboo at high temperature with pure oxygen to form nano-sized powder, and then making it into honeycomb porous environmentally friendly fiber through melt spinning technology. It has the characteristics of strong adsorption and good air permeability.

[0064] Furthermore, the carbon-based material forms a honeycomb-like microporous structure that runs through the inside and outside through a high-temperature calcination process. This structure can enhance the absorption and radiation capabilities of far-infrared rays. The nano-sized pores with a particle size ≤5μm not only improve the adsorption performance but also optimize the propagation path of far-infrared rays, enabling it to achieve an emissivity of 89% in the 8-14μm band, the effective far-infrared band.

[0065] The flax fiber used above is a rare natural plant fiber extracted from the stems of flax, which has excellent properties such as moisture absorption and heat dissipation, antibacterial and antistatic properties.

[0066] It is worth explaining;

[0067] like Figure 4 As shown, the first antibacterial layer 31 includes;

[0068] Chitosan fiber layer 311 is sewn to the top surface of the second flax fiber layer 24, and hemp fiber layer 312 is sewn to the top surface of chitosan fiber layer 311.

[0069] It mainly functions to be antibacterial and deodorizing, moisture-wicking and breathable, and promote wound healing. It is also environmentally friendly and has natural antibacterial properties that can inhibit bacterial growth. When combined with other antibacterial materials, it can effectively reduce foot odor and bacterial growth.

[0070] Hemp fiber primarily functions to absorb moisture and allow for breathability, as well as to provide antibacterial and protective support, thereby enhancing wearing comfort and reducing foot problems.

[0071] further;

[0072] like Figure 4As shown, both the chitin fiber layer 311 and the hemp fiber layer 312 are made of blended fabric, with the chitin fiber layer 311 containing 80% chitin fiber and 20% hemp fiber.

[0073] The hemp fiber layer 312 contains 80% hemp fiber and 20% chitin fiber.

[0074] Going a step further;

[0075] like Figure 5 As shown, the second antibacterial layer 32 includes;

[0076] Chitosan fiber layer 321 is sewn onto the top surface of hemp fiber layer 312, and kapok fiber layer 322 is sewn onto the top surface of chitosan fiber layer 321.

[0077] Chitosan fibers adsorb negatively charged bacteria, such as Escherichia coli and Staphylococcus aureus, through the positive charge of their amino groups, disrupting cell membrane permeability and inhibiting DNA replication. Even after 50 washes, the antibacterial rate remains ≥90%. Suitable for insoles in environments with high foot sweat and bacterial growth, it is also biodegradable, completely degrading in 60-90 days, making it suitable for insoles with high environmental protection requirements. Furthermore, its breathability and moisture-wicking properties help keep the inside of shoes dry and reduce bacterial growth.

[0078] Kapok fiber is characterized by its moisture absorption, breathability, comfort, and environmental friendliness. It has a unique hollow structure with a hollow rate of over 80%, which allows it to quickly absorb and release moisture, keeping the insole dry. Its excellent breathability promotes air circulation and reduces the accumulation of foot sweat.

[0079] in;

[0080] like Figure 5 As shown, both the chitosan fiber layer 321 and the kapok fiber layer 322 are made of blended fabric, with the chitosan fiber layer 321 containing 80% chitosan fiber and 20% kapok fiber.

[0081] Kapok fiber layer 322 contains 80% kapok fiber and 20% chitosan fiber.

[0082] in addition;

[0083] like Figure 6 As shown, the first antibacterial and breathable composite layer 33 includes:

[0084] Polylactic acid fiber 331 is sewn onto the top surface of kapok fiber layer 322, and plant extract modified fiber 332 is sewn onto the top surface of polylactic acid fiber 331.

[0085] Polylactic acid fiber contains natural lactic acid, which gives it antibacterial properties, inhibits bacterial growth, is suitable for sweaty feet, reduces odor, its porous structure promotes air circulation, its soft and smooth texture and foot-shaped design enhance wearing comfort, keep feet dry, reduce stuffiness, is less likely to cause discomfort with long-term wear, and is also biodegradable.

[0086] Plant extract modified fibers mainly play a role in antibacterial, deodorizing, moisture-wicking and breathable properties. These include, but are not limited to, plant extract modified fibers such as mugwort and mint. They can inhibit the growth of bacteria and fungi, reduce odor caused by foot sweat, and have high moisture absorption, which can quickly absorb foot sweat and keep the inside of the shoe dry.

[0087] at last;

[0088] like Figure 7 As shown, the second antibacterial and breathable composite layer 34 includes:

[0089] Bamboo fiber layer 341 is sewn onto the top surface of plant extract modified fiber 332, and pure cotton fabric layer 342 is sewn onto the top surface of bamboo fiber layer 341.

[0090] Bamboo fiber mainly functions to absorb sweat, be breathable, antibacterial, and deodorizing. It also provides some support and has a hollow structure that allows it to quickly absorb and evaporate sweat, keeping the inside of the shoe dry. It contains natural antibacterial ingredients that can inhibit bacterial growth and reduce foot odor. Its antibacterial rate can reach 99%, making it suitable for environments where people sweat easily or wear shoes for long periods of time.

[0091] Pure cotton fabric is moisture-wicking, breathable, and skin-friendly. It can absorb and wick away sweat, keeping feet dry, making it especially suitable for people who sweat easily. Its porous structure allows air circulation, reducing stuffiness, and direct contact with the soles of the feet ensures the necessary comfort.

[0092] All of the above use bio-based materials as raw materials for the production of insoles. Therefore, in addition to having antibacterial, deodorizing, breathable and moisture-wicking functions and effects, they also have a degradable effect, thereby achieving the desired purpose and the intended technical effect.

[0093] It can be made using the following methods;

[0094] Step 1, base layer preparation: take flax fibers and weave them into flax fiber fabric with a thickness of 2-3mm, as the flax fiber fabric base layer 1;

[0095] After washing and drying, the loofah fibers are combed into a web to form a loofah fiber layer 21 with a thickness of 1-1.5mm. The loofah fiber layer 21 is sewn into the flax fiber fabric base layer 1 using a flat sewing process, with a seam spacing of 5-8mm to ensure that the loofah fiber layer 21 is flat and fixed.

[0096] Step 2, preparation and composite of the carrier layer: take flax fibers and spin them into a first flax fiber layer 22 with a thickness of 1-2 mm, and take wool fibers and comb them into a wool fiber layer 23 with a thickness of 0.8-1.2 mm;

[0097] The wool fiber layer 23 is laid flat inside the first flax fiber layer 22 and fixed by overlock stitching to form a support layer. The support layer is then sewn to the top surface of the base layer obtained in step 1 by flat stitching, with a 0.5mm allowance left at the sewn edge.

[0098] Step 3, preparation and composite of deodorizing layer: take flax fiber and weave it into a second flax fiber layer 24 with a thickness of 1-1.5 mm. Take bamboo carbon base and plant fiber and press them together to form a carbon base layer 25 with a thickness of 2-25 mm. Embed the carbon base layer 25 into the interior of the second flax fiber layer 24 and seal it with a blind seam process to form a deodorizing layer. Sew the deodorizing layer to the top surface of the supporting layer, with the sewing line aligned with the edge of the supporting layer.

[0099] Step 4, Preparation and lamination of the antibacterial composite layer, preparation of the first antibacterial layer 31:

[0100] Chitosan fiber layer 311 with a thickness of 0.6-0.8 mm is spun by blending 80% chitosan fiber and 20% hemp fiber, and hemp fiber layer 312 with a thickness of 0.6-0.8 mm is spun by blending 80% hemp fiber and 20% chitosan fiber. Chitosan fiber layer 311 and hemp fiber layer 312 are then sewn together and attached to the top surface of the deodorizing layer.

[0101] Preparation of the second antibacterial layer 32: Chitosan fiber layer 321 with a thickness of 0.5-0.7 mm is spun by blending 80% chitosan fiber and 20% kapok fiber. Kapok fiber layer 322 with a thickness of 0.5-0.7 mm is spun by blending 80% kapok fiber and 20% chitosan fiber. Chitosan fiber layer 321 and kapok fiber layer 322 are then stacked and sewn onto the top surface of the first antibacterial layer 31 using a serrated stitch process.

[0102] Preparation of the first antibacterial and breathable composite layer 33:

[0103] Polylactic acid fiber is woven into a polylactic acid fiber layer 331 with a thickness of 0.4-0.6 mm. Plant extracts, such as artemisia extract, are combined with cellulose fibers through impregnation and drying processes to form a plant extract modified fiber layer 332. The polylactic acid fiber layer 331 and the plant extract modified fiber layer 332 are flat-sewn together and sewn onto the top surface of the second antibacterial layer 32.

[0104] Preparation of the second antibacterial and breathable composite layer 34:

[0105] Bamboo fiber is woven into a bamboo fiber layer 341 with a thickness of 0.5-0.8mm, and pure cotton fiber is woven into a pure cotton fabric layer 342 with a thickness of 0.3-0.5mm. The bamboo fiber layer 341 and the pure cotton fabric layer 342 are overlapped and sewn onto the top surface of the first antibacterial and breathable composite layer 33 using an edge-sealing process.

[0106] Step 5: Overall molding. Trim the edges of the composite multi-layer structure to ensure consistent dimensions. Use hot pressing for shaping at a temperature of 70-120℃, a pressure of 2-2.5MPa, and a time of 7-120min to enhance the interlayer bonding force. Then, conduct quality inspection to check the firmness of the stitching of each layer and ensure there is no delamination. This yields an environmentally friendly bio-based insole.

[0107] The test report is shown in the table below:

[0108]

[0109] The above are merely preferred embodiments, including but not limited to the above one embodiment. The bamboo charcoal fiber in this embodiment is not only used for the production of insoles, but can also be used for chair cushions, mattresses, sofas, pillows and furniture. In addition, it can also be applied to decoration materials, shoe lining materials (thickness 2-35mm) and shoe midsole materials (2-10mm), and the sole material is made of bamboo charcoal fiber with a thickness of (20-150mm).

[0110] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly bio-based insole, characterized in that, Including flax fiber fabric base layer (1); The flax fiber fabric base layer (1) is sewn with a loofah fiber layer (21) inside, and the top of the flax fiber fabric base layer (1) is sewn with a supporting layer and a deodorizing layer sewn to the top surface of the supporting layer; The top of the deodorizing layer is provided with an antibacterial composite layer (3), the antibacterial composite layer (3) includes: A first antibacterial layer (31) is disposed on the top surface of the deodorizing layer. A second antibacterial layer (32) and a first antibacterial and breathable composite layer (33) connected to the second antibacterial layer (32) are disposed on the top surface of the first antibacterial and breathable composite layer (33). A second antibacterial and breathable composite layer (34) is disposed on the top surface of the first antibacterial and breathable composite layer (33).

2. The environmentally friendly bio-based insole according to claim 1, characterized in that: The supporting layer includes; A first flax fiber layer (22) is sewn to the top surface of the flax fiber fabric base layer (1) and the loofah fiber layer (21), and a wool fiber layer (23) is sewn inside the first flax fiber layer (22).

3. The environmentally friendly bio-based insole according to claim 2, characterized in that: The deodorizing layer includes: A second flax fiber layer (24) is sewn onto the top surface of the first flax fiber layer (22) and the wool fiber layer (23), and a carbon base layer (25) is sewn into the interior of the second flax fiber layer (24).

4. The environmentally friendly bio-based insole according to claim 3, characterized in that: The first antibacterial layer (31) includes: A chitin fiber layer (311) is sewn onto the top surface of the second flax fiber layer (24), and a hemp fiber layer (312) is sewn onto the top surface of the chitin fiber layer (311).

5. The environmentally friendly bio-based insole according to claim 4, characterized in that: The chitin fiber layer (311) and the hemp fiber layer (312) are both made of blended fabric. The chitin fiber layer (311) contains 80% chitin fiber and 20% hemp fiber. The hemp fiber layer (312) contains 80% hemp fiber and 20% chitin fiber.

6. The environmentally friendly bio-based insole according to claim 4, characterized in that: The second antibacterial layer (32) includes; A chitosan fiber layer (321) is sewn onto the top surface of the hemp fiber layer (312), and a kapok fiber layer (322) is sewn onto the top surface of the chitosan fiber layer (321).

7. The environmentally friendly bio-based insole according to claim 6, characterized in that: Both the chitosan fiber layer (321) and the kapok fiber layer (322) are made of blended fabric. The chitosan fiber layer (321) contains 80% chitosan fiber and 20% kapok fiber. The kapok fiber layer (322) contains 80% kapok fiber and 20% chitosan fiber.

8. The environmentally friendly bio-based insole according to claim 7, characterized in that: The first antibacterial and breathable composite layer (33) includes: Polylactic acid fiber (331) is sewn onto the top surface of the kapok fiber layer (322), and the top surface of the polylactic acid fiber (331) is sewn with plant extract modified fiber (332).

9. The environmentally friendly bio-based insole according to claim 8, characterized in that: The second antibacterial and breathable composite layer (34) includes: A bamboo fiber layer (341) is sewn onto the top surface of the plant extract modified fiber (332), and a pure cotton fabric layer (342) is sewn onto the top surface of the bamboo fiber layer (341).

10. The environmentally friendly bio-based insole according to claim 1, characterized in that: The aforementioned is produced using the following method; Step 1, base layer preparation: take flax fibers and weave them into flax fiber fabric with a thickness of 2-3 mm to serve as the base layer of the flax fiber fabric (1); After washing and drying, the loofah fibers are combed into a web to form a loofah fiber layer (21) with a thickness of 1-1.5 mm. The loofah fiber layer (21) is sewn into the base layer (1) of the flax fiber fabric using a flat sewing process. The stitch spacing is 5-8 mm to ensure that the loofah fiber layer (21) is flat and fixed. Step 2, preparation and composite of the carrier layer: take flax fiber and spin it into a first flax fiber layer with a thickness of 1-2 mm (22), take wool fiber and comb it into a wool fiber layer with a thickness of 0.8-1.2 mm (23); The wool fiber layer (23) is laid flat inside the first flax fiber layer (22) and fixed by overlock stitching to form a support layer. The support layer is then stitched to the top surface of the base layer obtained in step 1 by flat stitching, with a 0.5mm margin left at the stitching edge. Step 3, preparation and composite of deodorizing layer: take flax fiber and weave it into a second flax fiber layer (24) with a thickness of 1-1.5 mm. Take bamboo carbon base and plant fiber and press them together to form a carbon base layer (25) with a thickness of 2-25 mm. Embed the carbon base layer (25) into the second flax fiber layer (24) and seal it with a blind seam process to form a deodorizing layer. Sew the deodorizing layer to the top surface of the supporting layer, with the sewing line aligned with the edge of the supporting layer. Step 4, preparation and lamination of the antibacterial composite layer, preparation of the first antibacterial layer (31): Chitosan fiber (311) is spun into a chitosan fiber layer (311) with a thickness of 0.6-0.8 mm by blending 80% chitosan fiber and 20% hemp fiber, and hemp fiber layer (312) with a thickness of 0.6-0.8 mm by blending 80% hemp fiber and 20% chitosan fiber. The chitosan fiber layer (311) and the hemp fiber layer (312) are then sewn together and attached to the top surface of the deodorizing layer. Preparation of the second antibacterial layer (32): Chitosan fiber layer (321) with a thickness of 0.5-0.7 mm is spun by blending 80% chitosan fiber and 20% kapok fiber. Kapok fiber layer (322) with a thickness of 0.5-0.7 mm is spun by blending 80% kapok fiber and 20% chitosan fiber. Chitosan fiber layer (321) and kapok fiber layer (322) are then stacked and sewn onto the top surface of the first antibacterial layer (31) using a sawtooth stitching process. Preparation of the first antibacterial and breathable composite layer (33): Polylactic acid fiber is spun into a polylactic acid fiber layer (331) with a thickness of 0.4-0.6 mm. Plant extract and cellulose fiber are combined through impregnation and drying processes to form a plant extract modified fiber layer (332). The polylactic acid fiber layer (331) and the plant extract modified fiber layer (332) are flat-sewn together and sewn onto the top surface of the second antibacterial layer (32). Preparation of the second antibacterial and breathable composite layer (34): Bamboo fiber is woven into a bamboo fiber layer (341) with a thickness of 0.5-0.8 mm, and pure cotton fiber is woven into a pure cotton fabric layer (342) with a thickness of 0.3-0.5 mm. The bamboo fiber layer (341) and the pure cotton fabric layer (342) are overlapped and sewn onto the top surface of the first antibacterial and breathable composite layer (33) using the edge-sealing process. Step 5: Overall molding. Trim the edges of the composite multi-layer structure to ensure consistent dimensions. Use hot pressing for shaping at a temperature of 200-248℃, a pressure of 2-3MPa, and a time of 70-120 minutes to enhance the interlayer bonding. Then, conduct quality inspection to check the firmness of the stitching of each layer and ensure there is no delamination. This yields an environmentally friendly bio-based insole.

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