Bamboo fiber insole cloth as well as preparation method and application thereof

Abstract

The invention provides bamboo fiber insole cloth as well as a preparation method and application thereof, and relates to the technical field of insole cloth. The bamboo fiber insole cloth comprises a surface layer and a bottom layer, the surface layer is a fiber layer and is composed of 60-80% of regenerated chemical fibers, 15-30% of nandina fibers and 5-15% of low-melting-point fibers, and the fiber layer is of a micropore structure; the bottom layer is a cotton cloth layer, and the main component is polyester cotton blending; the fiber layer and the cotton cloth layer are connected and fastened into a whole through needling. By adopting the specific material composition and structure, the insole cloth with good moisture removal performance and air permeability can be obtained, and the insole cloth is particularly suitable for sports shoes and other shoe products under more sweating scenes.

Description

Technical Field

[0001] This invention relates to the field of insole fabric technology, and in particular to a bamboo fiber insole fabric, its preparation method, and its application. Background Technology

[0002] The midsole fabric is a key lining material in the shoe manufacturing process. It is located between the midsole (or outsole) and the upper of the shoe and mainly plays a role in connection, support, cushioning and transition.

[0003] Currently, most midsole fabrics on the market focus on enhancing abrasion resistance and strength. These fabrics are typically thicker and have poor breathability and moisture wicking properties. As people's pursuit of a higher quality of life continues to increase, it's clear that current shoe midsole fabrics can no longer meet these higher demands. Summary of the Invention

[0004] This invention provides a bamboo fiber insole fabric, its preparation method, and its application, which solves the defects of poor breathability and moisture wicking in existing insole fabrics, thereby achieving a midsole fabric with good breathability and moisture wicking while ensuring strength and lightweight.

[0005] In a first aspect, the present invention provides a bamboo fiber insole fabric, comprising a top layer and a bottom layer, wherein the top layer is a fiber layer composed of 60-80% regenerated chemical fiber, 15-30% bamboo fiber and 5-15% low melting point fiber, and the fiber layer has a microporous structure; the bottom layer is a cotton fabric layer, the main component of which is a polyester-cotton blend; the fiber layer and the cotton fabric layer are fastened together by needle punching.

[0006] According to an embodiment of the present invention, the bamboo fiber insulator fabric is a recycled polyester staple fiber with a fineness of 1.2~6D.

[0007] According to an embodiment of the present invention, the bamboo fiber insole fabric has a fineness of 1.2~3.3D.

[0008] The bamboo fiber insole fabric provided according to an embodiment of the present invention uses Fuller low-melting-point fiber with a fineness of 2~4D.

[0009] According to an embodiment of the present invention, the bamboo fiber insole fabric is composed of 65-75% recycled polyester staple fiber, 15-20% bamboo fiber, and 10-15% Fuller low melting point fiber.

[0010] According to an embodiment of the present invention, the microporous structure of the fiber layer of the bamboo fiber insole is formed by needle punching.

[0011] Secondly, the present invention provides the application of the above-mentioned bamboo fiber insole fabric in footwear products.

[0012] Thirdly, the present invention provides a method for preparing bamboo fiber insole fabric, comprising: preparing a cotton fabric layer and a fiber layer respectively, bonding the two layers together by needle punching, and then hot pressing for shaping; The preparation of the fiber layer includes: mixing and opening 60-80% of regenerated chemical fiber, 15-30% of bamboo fiber and 5-15% of low melting point fiber, and then carding and laying the web.

[0013] According to an embodiment of the present invention, a method for preparing bamboo fiber backing fabric includes the following steps: Opening: 65-75% recycled polyester staple fiber, 15-20% bamboo fiber and 10-15% Fuller low melting point fiber are put into the cotton mixer for the first opening and mixing, and then put into the opening machine for full opening. Carding: After opening, the material is fed into the carding machine under the control of the weighing control system. Web laying: The combed fiber web is fed to the web laying machine, where it is repeatedly folded and laid to form a fiber layer. Needle-punching composite: The fiber layer is drawn into the needle-punching machine through V-shaped feeding. The cotton fabric layer is placed behind the second needle-punching machine and then drawn to the surface of the fiber layer. Under the piercing action of the needle-punching machine, the fibers in the fiber layer interweave with each other, and the cotton fabric layer is composited onto the fiber layer through the needle-punching action. Hot pressing and setting: Under the action of the heat press machine, the low melting point fibers in the fiber layer melt, and after cooling, the fiber layer and the cotton layer are firmly bonded together to form a bamboo fiber insole.

[0014] According to the method for preparing bamboo fiber insole fabric provided in this embodiment of the invention, the carding machine parameters are as follows: Chest cylinder rotation speed: 23 Hz; Chest cylinder working roller speed: 20 Hz; Main cylinder speed: 42 Hz; Main cylinder working roll speed: 20 Hz; Feeding speed: 13.8 Hz; Dolph speed: 24.4 Hz; Pre-random speed: 8.3 Hz; Post-random speed: 13.2 Hz; The parameters of the screen laying machine are: Width of access to the network: 2050mm; Width of the mesh: 3427mm; Overlap coefficient: 90; Adjustment factor: 0.089; The parameters of the acupuncture machine are: The first acupuncture machine operates at a speed of 339 r / min. The second acupuncture machine operates at a speed of 1020 r / min. The third acupuncture machine operates at a speed of 899 r / min. The fourth acupuncture machine operates at a speed of 605 r / min. The fifth acupuncture machine operates at a speed of 659 r / min. The sixth needle puncture machine operates at a speed of 479 r / min. The seventh acupuncture machine operates at a speed of 650 r / min. Heat press machine parameters: Hot pressing stretching: 0.625 Hz; Lower shaft temperature: 210℃; Central axis temperature: 205℃; Upper shaft temperature: 210℃.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a bamboo fiber insole fabric, its preparation method, and its application. By mixing regenerated chemical fiber, bamboo fiber, and low-melting-point fiber in a specific ratio to obtain a fiber layer, and then using the fiber layer as the surface layer and the cotton fabric layer as the bottom layer to be needle-punched together, a midsole fabric with good moisture wicking and breathability can be obtained, which is particularly suitable for footwear products such as sports shoes that sweat a lot. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0017] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0018] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "specific implementation," or "some specific implementations," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0019] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0020] In a first aspect, the present invention provides a bamboo fiber insole fabric, comprising a top layer and a bottom layer. The top layer is a fiber layer composed of 60-80% regenerated chemical fiber, 15-30% bamboo fiber, and 5-15% low-melting-point fiber, and the fiber layer has a microporous structure. The bottom layer is a cotton fabric layer, mainly composed of polyester-cotton blend. The fiber layer and the cotton fabric layer are fastened together by needle punching.

[0021] It should be noted that, unless otherwise specified, all percentage contents mentioned in this invention are mass percentage contents.

[0022] The recycled chemical fiber mentioned in this invention refers to chemical fibers (such as recycled polyester / rPET, recycled nylon / rPA, etc.) that are made from recycled materials (mainly waste plastic products, such as PET bottles) through chemical methods.

[0023] The bamboo fiber described in this invention is a regenerated cellulose fiber made from bamboo. It belongs to the category of man-made fibers. It is not a natural fiber directly peeled from bamboo (such as cotton or linen), but rather the cellulose is extracted from bamboo through chemical methods, then dissolved and spun into fibers. Its raw material is mainly derived from fast-growing, renewable bamboo (commonly moso bamboo, *Phyllostachys edulis*, etc.). Bamboo has a short growth cycle (it matures in 3-5 years), strong adaptability, and requires no pesticides or fertilizers, exhibiting significant ecological advantages. Its current mainstream production process is similar to the viscose method: Pulping: Bamboo chips or shavings are dissolved using chemical methods (commonly sulfate method or pre-hydrolyzed sulfate method) to extract relatively pure bamboo pulp (cellulose); Dissolving: Bamboo pulp is soaked in a strong alkali (such as NaOH) to generate alkali cellulose, which is then reacted with carbon disulfide (CS2) to generate cellulose sulfonate (viscose liquid); Spinning: After filtering and maturing the viscose liquid, it is extruded through a spinneret into a coagulation bath containing sulfuric acid, sodium sulfate, zinc sulfate, etc., where the cellulose sulfonate decomposes and regenerates, and coagulates into filaments; Post-treatment: The fibers are washed, desulfurized, bleached, oiled, and dried to obtain the finished bamboo fiber (filament or staple fiber).

[0024] The low-melting-point fiber described in this invention refers to a fiber whose outer layer melts and bonds when heated to a certain temperature (usually between 100°C and 150°C). This fiber has excellent thermal bonding properties, is easily mixed with other fibers, and also has good elasticity.

[0025] The insole fabric of this invention has a two-layer structure: a fiber layer on the surface and a cotton fabric layer on the bottom. The fiber layer is composed of regenerated chemical fibers, bamboo fibers, and low-melting-point fibers. The fiber layer and cotton fabric layer are bonded together using needle-punching nonwoven technology, and the needle-punching process creates a uniform microporous structure in the fiber layer. The cotton fabric layer is mainly composed of a polyester-cotton blend, which has good moisture absorption. Regenerated chemical fibers have poor moisture absorption, creating a pressure difference on both sides of the insole fabric. Bamboo fibers, with their excellent moisture absorption, act as a siphon in the insole fabric structure, rapidly absorbing moisture from the surface to the bottom layer under the pressure difference, thus achieving moisture removal. The microporous structure inside the insole fabric provides excellent breathability, and the specific material composition not only gives it good moisture absorption and removal properties but also a certain degree of antibacterial effect. Furthermore, the low-melting-point fibers added to the fiber layer melt and adhere to the surface of other blended fibers at high temperatures, making the overall structure of the insole fabric more stable and more elastic.

[0026] In addition, this invention uses recycled chemical fiber as the main raw material and low-melting-point fiber and bio-based bamboo fiber as auxiliary raw materials, which saves energy and reduces emissions, and meets the requirements of green environmental protection.

[0027] In some embodiments of the present invention, the recycled chemical fiber is recycled polyester staple fiber with a fineness of 1.2~6D.

[0028] In some embodiments of the present invention, the fineness of the bamboo fiber is 1.2~3.3D.

[0029] In some embodiments of the present invention, the low-melting-point fiber is Fuller low-melting-point fiber with a fineness of 2~4D.

[0030] In some preferred embodiments of the present invention, the fiber layer is composed of 65-75% recycled polyester staple fiber, 15-20% bamboo fiber, and 10-15% Fuller low-melting-point fiber. The fineness of the recycled polyester staple fiber is 1.2-6D. The fineness of the bamboo fiber is 1.2-3.3D. The fineness of the Fuller low-melting-point fiber is 2-4D. Experiments have shown that using the above-mentioned content and fineness of recycled polyester staple fiber, bamboo fiber, and Fuller low-melting-point fiber results in a midsole fabric with superior overall performance.

[0031] More preferably, in some embodiments of the present invention, the fiber layer is composed of 70% recycled polyester staple fiber, 20% bamboo fiber, and 10% Fuller low-melting-point fiber. The fineness of the recycled polyester staple fiber is 1.2~6D. The fineness of the bamboo fiber is 1.2~3.3D. The fineness of the Fuller low-melting-point fiber is 2~4D.

[0032] In some embodiments of the present invention, the microporous structure of the fiber layer is formed by needle punching.

[0033] Secondly, the present invention provides the application of the above-mentioned bamboo fiber insole fabric in footwear products.

[0034] Thirdly, the present invention provides a method for preparing bamboo fiber insole fabric, comprising: preparing a cotton fabric layer and a fiber layer respectively, bonding the two layers together by needle punching, and then hot pressing for shaping; The preparation of the fiber layer includes: mixing and opening 60-80% of regenerated chemical fiber, 15-30% of bamboo fiber and 5-15% of low melting point fiber, and then carding and laying the web.

[0035] In some embodiments of the present invention, the preparation method includes the following steps: Opening: 65-75% recycled polyester staple fiber, 15-20% bamboo fiber and 10-15% Fuller low melting point fiber are put into the cotton mixer for the first opening and mixing, and then put into the opening machine for full opening. Carding: After opening, the material is fed into the carding machine under the control of the weighing control system. Web laying: The combed fiber web is fed to the web laying machine, where it is repeatedly folded and laid to form a fiber layer. Needle-punching composite: The fiber layer is drawn into the needle-punching machine through V-shaped feeding. The cotton fabric layer is placed behind the second needle-punching machine and then drawn to the surface of the fiber layer. Under the piercing action of the needle-punching machine, the fibers in the fiber layer interweave with each other, and the cotton fabric layer is composited onto the fiber layer through the needle-punching action. Hot pressing and setting: Under the action of the heat press machine, the low melting point fibers in the fiber layer melt, and after cooling, the fiber layer and the cotton layer are firmly bonded together to form a bamboo fiber insole.

[0036] Furthermore, in the above preparation method, the parameters of the carding machine are: Chest cylinder rotation speed: 23 Hz; Chest cylinder working roller speed: 20 Hz; Main cylinder speed: 42 Hz; Main cylinder working roll speed: 20 Hz; Feeding speed: 13.8 Hz; Dolph speed: 24.4 Hz; Pre-random speed: 8.3 Hz; Post-random speed: 13.2 Hz; The parameters of the screen laying machine are: Width of access to the network: 2050mm; Width of the mesh: 3427mm; Overlap coefficient: 90; Adjustment factor: 0.089; The parameters of the acupuncture machine are: The first acupuncture machine operates at a speed of 339 r / min. The second acupuncture machine operates at a speed of 1020 r / min. The third acupuncture machine operates at a speed of 899 r / min. The fourth acupuncture machine operates at a speed of 605 r / min. The fifth acupuncture machine operates at a speed of 659 r / min. The sixth needle puncture machine operates at a speed of 479 r / min. The seventh acupuncture machine operates at a speed of 650 r / min. Heat press machine parameters: Hot pressing stretching: 0.625 Hz; Lower shaft temperature: 210℃; Central axis temperature: 205℃; Upper shaft temperature: 210℃.

[0037] Furthermore, the parameters for the acupuncture machine are: The first acupuncture machine has a rotation speed of 339 r / min, a V-curtain stretch of 0.66 Hz, an input stretch of 1.146 Hz, an output stretch of 1.075 Hz, a drag net position of 647 mm, and a stripping net position of -345 mm. The second acupuncture machine has a rotation speed of 1020 r / min, an input draft of 0.797 Hz, an output draft of 1.275 Hz, a drag net position of -72 mm, and a stripping net position of -1244 mm. The third needle punching machine has a rotation speed of 899 r / min, an input draft of 0.932 hz, an output draft of 1.25 hz, a drag net position of 2528 mm, and a stripping net position of 0 mm. The fourth needle punching machine has a rotation speed of 605 r / min, an input draft of 0.966 Hz, an output draft of 1.06 Hz, a net dragging position of 1457 mm, and a net stripping position of 4 mm. The fifth needle punching machine has a rotation speed of 659 r / min, an input draft of 0.881 Hz, an output draft of 1.102 Hz, a drag net position of 762 mm, and a stripping net position of -13 mm. The sixth needle punching machine has a rotation speed of 479 r / min, an input draft of 0.902 Hz, an output draft of 1.098 Hz, a net dragging position of 1152 mm, and a net stripping position of 0 mm. The seventh needle punching machine has the following speed: 650 r / min, input stretching 1.099 Hz, output stretching 1.419 Hz, dragging position 600 mm, and stripping position 94 mm.

[0038] To facilitate understanding of the bamboo fiber insole fabric and its preparation method provided by the present invention, the following description is provided through some specific examples and comparative examples.

[0039] In the following examples, the fineness of the recycled polyester staple fiber used is 1.2~6D; the fineness of the bamboo fiber is 1.2~3.3D; and the fineness of the Fuller low melting point fiber is 2~4D.

[0040] The cotton fabric used is a polyester-cotton blend.

[0041] Example 1 This embodiment provides a bamboo fiber insole fabric, including a top layer and a bottom layer. The top layer is a fiber layer composed of 70% recycled polyester staple fiber, 20% bamboo fiber, and 10% Fuller low melting point fiber, and the fiber layer has a microporous structure. The bottom layer is a cotton fabric layer. The fiber layer and the cotton fabric layer are fastened together by needle punching.

[0042] The specific preparation steps are as follows: Opening: The recycled polyester staple fiber, bamboo fiber and Fuller low melting point fiber are put into the cotton mixer for the first opening and mixing, and then put into the opening machine for full opening; Carding: After opening, the feeding is controlled by the weighing control system and the material enters the carding machine for carding. The carding machine parameters are: breast cylinder speed: 23 Hz, breast cylinder working roll speed: 20 Hz, main cylinder speed: 42 Hz, main cylinder working roll speed: 20 Hz, feeding speed: 13.8 Hz, doffer speed: 24.4 Hz, front miscellaneous speed: 8.3 Hz, rear miscellaneous speed: 13.2 Hz.

[0043] Web laying: The combed fiber web is conveyed to the web laying machine, where it is repeatedly folded and laid to form a fiber layer. The parameters of the web laying machine are: infeed width: 2050mm, outfeed width: 3427mm, overlap coefficient: 90, adjustment coefficient: 0.089.

[0044] Needle-punching composite: The fiber layer is drawn into the needle-punching machine through V-shaped feeding. The cotton fabric layer is placed behind the second needle-punching machine and then drawn to the surface of the fiber layer. Under the piercing action of the needle-punching machine, the fibers in the fiber layer interweave with each other, and the cotton fabric layer is composited onto the fiber layer through the needle-punching action. The parameters of the acupuncture machine are: The first acupuncture machine has a rotation speed of 339 r / min, a V-curtain stretch of 0.66 Hz, an input stretch of 1.146 Hz, an output stretch of 1.075 Hz, a drag net position of 647 mm, and a stripping net position of -345 mm. The second acupuncture machine has a rotation speed of 1020 r / min, an input draft of 0.797 Hz, an output draft of 1.275 Hz, a drag net position of -72 mm, and a stripping net position of -1244 mm. The third needle punching machine has a rotation speed of 899 r / min, an input draft of 0.932 hz, an output draft of 1.25 hz, a drag net position of 2528 mm, and a stripping net position of 0 mm. The fourth needle punching machine has a rotation speed of 605 r / min, an input draft of 0.966 Hz, an output draft of 1.06 Hz, a net dragging position of 1457 mm, and a net stripping position of 4 mm. The fifth needle punching machine has a rotation speed of 659 r / min, an input draft of 0.881 Hz, an output draft of 1.102 Hz, a drag net position of 762 mm, and a stripping net position of -13 mm. The sixth needle punching machine has a rotation speed of 479 r / min, an input draft of 0.902 Hz, an output draft of 1.098 Hz, a net dragging position of 1152 mm, and a net stripping position of 0 mm. The seventh needle punching machine has the following speed: 650 r / min, input stretching 1.099 Hz, output stretching 1.419 Hz, dragging position 600 mm, and stripping position 94 mm.

[0045] Hot pressing and setting: Under the action of the heat press machine, the low melting point fibers in the fiber layer melt, and after cooling, the fiber layer and the cotton layer are firmly bonded together to form a bamboo fiber base fabric; the heat press machine parameters are: hot pressing stretch: 0.625hz, lower shaft temperature: 210℃, middle shaft temperature: 205℃, upper shaft temperature: 210℃.

[0046] Example 2 This embodiment provides a bamboo fiber insulated fabric, comprising a top layer and a bottom layer. The top layer is a fiber layer composed of 65% recycled polyester staple fiber, 20% bamboo fiber, and 15% Fuller low-melting-point fiber, and the fiber layer has a microporous structure. The bottom layer is a cotton fabric layer. The fiber layer and the cotton fabric layer are fastened together by needle punching. The preparation method is the same as in Embodiment 1.

[0047] Example 3 This embodiment provides a bamboo fiber insulated fabric, comprising a top layer and a bottom layer. The top layer is a fiber layer composed of 75% recycled polyester staple fiber, 15% bamboo fiber, and 10% Fuller low-melting-point fiber, and the fiber layer has a microporous structure. The bottom layer is a cotton fabric layer. The fiber layer and the cotton fabric layer are fastened together by needle punching. The preparation method is the same as in Embodiment 1.

[0048] Example 4 This embodiment provides a bamboo fiber insole fabric, including a top layer and a bottom layer. The top layer is a fiber layer composed of 70% recycled polyester staple fiber, 20% bamboo fiber, and 10% Fuller low melting point fiber, and the fiber layer has a microporous structure. The bottom layer is a cotton fabric layer. The fiber layer and the cotton fabric layer are fastened together by needle punching.

[0049] The difference between its preparation method and Example 1 is that the carding machine parameters are as follows: breast cylinder speed: 32 Hz, breast cylinder working roll speed: 50 Hz, main cylinder speed: 40 Hz, main cylinder working roll speed: 25 Hz, feed speed: 13 Hz, doffer speed: 20 Hz, front randomization speed: 9 Hz, and rear randomization speed: 13 Hz.

[0050] Example 5 This embodiment provides a bamboo fiber insole fabric, including a top layer and a bottom layer. The top layer is a fiber layer composed of 70% recycled polyester staple fiber, 20% bamboo fiber, and 10% Fuller low melting point fiber, and the fiber layer has a microporous structure. The bottom layer is a cotton fabric layer. The fiber layer and the cotton fabric layer are fastened together by needle punching.

[0051] The difference between its preparation method and Example 1 is that the parameters of the net laying machine are: net entry width: 2000mm, net exit width: 3200mm, overlap coefficient: 70, adjustment coefficient: 0.08; Heat press machine parameters: hot pressing stretching: 0.62 Hz, lower shaft temperature: 210℃, middle shaft temperature: 205℃, upper shaft temperature: 210℃.

[0052] Example 6 This embodiment provides a bamboo fiber insole fabric, including a top layer and a bottom layer. The top layer is a fiber layer composed of 70% recycled polyester staple fiber, 20% bamboo fiber, and 10% Fuller low melting point fiber, and the fiber layer has a microporous structure. The bottom layer is a cotton fabric layer. The fiber layer and the cotton fabric layer are fastened together by needle punching.

[0053] The difference between its preparation method and that of Example 1 lies in the parameters of the acupuncture machine: The first acupuncture machine has a rotation speed of 339 r / min, a V-curtain stretch of 0.66 Hz, an input stretch of 1.146 Hz, an output stretch of 1.075 Hz, a drag net position of 647 mm, and a stripping net position of -345 mm. The second acupuncture machine has a rotation speed of 1020 r / min, an input draft of 0.797 Hz, an output draft of 1.275 Hz, a drag net position of -72 mm, and a stripping net position of -1244 mm. The third needle punching machine has a rotation speed of 899 r / min, an input draft of 0.932 hz, an output draft of 1.25 hz, a drag net position of 2528 mm, and a stripping net position of 0 mm. The fourth needle punching machine has a rotation speed of 659 r / min, an input draft of 0.881 Hz, an output draft of 1.102 Hz, a drag net position of 762 mm, and a stripping net position of -13 mm. The fifth needle punching machine has the following speed: 650 r / min, input stretching 1.099 Hz, output stretching 1.419 Hz, dragging position 600 mm, and stripping position 94 mm.

[0054] control group This control group provides a common insole fabric made of pure polyester fiber, with the same thickness as the insole fabric in the examples.

[0055] Performance testing (a) Antibacterial properties Detection method: QB / T2881-2013 Technical conditions for antimicrobial properties of footwear and footwear components (Appendix D, oscillation method).

[0056] Sample preparation: autoclave at 115℃ for 30 min.

[0057] Test sample: 1g; Working solution: Phosphate-buffered saline (PBS); Oscillation time: See Table 1; Test strains: Staphylococcus aureus ATCC 6538; Klebsiella pneumoniae ATCC 4352; Candida albicans ATCC 10231; The test results of the sample before washing in Example 1 are shown in Table 1.

[0058] Table 1

[0059] The results above show that the insole fabric of Example 1 of the present invention has excellent antibacterial effect. After 10 washes, the antibacterial rate of the sample in Example 1 decreased by approximately 10%.

[0060] (ii) Bursting strength, tensile strength, elongation at constant strength, tear strength Test basis: Gram weight: Tested according to GB / T4669-2008.

[0061] Bursting strength: This indicator represents the maximum pressure the fabric can withstand before bursting, directly affecting the puncture resistance of the insole and backing fabric. Testing is conducted according to GB / T7742.1-2005, with a standard value of ≥25 kgf / cm². 2 .

[0062] Longitudinal tensile strength: GB / T 3923.1-2013, standard value ≥250N / 2.54cm.

[0063] Transverse tensile strength: GB / T 3923.1-2013, standard value ≥200N / 2.54cm.

[0064] Longitudinal 100N constant strength elongation: GB / T 3923.1-2013, standard value ≤5%.

[0065] Transverse 100N constant strength elongation: GB / T 3923.1-2013, standard value ≤15%.

[0066] Longitudinal tear strength: QB / T 2883-2007, standard value ≥50N.

[0067] Transverse tear strength: QB / T 2883-2007, standard value ≥50N.

[0068] The test results are shown in Table 2 (sampling specifications: thickness 1.5 mm, width 54 inches).

[0069] Table 2

[0070] (iii) Moisture absorption and wicking properties, breathability, and softness Moisture wicking: This is used to assess the ability of midsole nonwoven fabric to absorb and transfer liquid water (sweat), which is key to the feeling of dryness of the feet. The test is based on GT-27. This method measures the amount of water (by weight) absorbed by the test material when it is immersed in water for a specified time and the resulting increase in volume. It also measures the amount of water subsequently released when the test material is dried under standard conditions for a specified time, as well as the volume reduction (shrinkage) that occurs when the controlled test material is exposed to heat for a specified time.

[0071] Air permeability: The air permeability test was conducted using the HZ-6042A air permeability tester from Dongguan Lixian Instrument Technology Co., Ltd., following its operating instructions (sample pressure difference 100Pa, nozzle pressure difference 608Pa).

[0072] Softness: Test standard GB / T39371-2020, diameter of round hole: 25mm.

[0073] The test results are shown in Table 3.

[0074] Table 3

[0075] The results above show that the midsole fabrics of Examples 1-3 of this invention have superior overall performance, while the other examples are inferior. Compared with the conventional control group, the midsole fabrics obtained in the examples of this invention have significantly better moisture wicking and breathability, without sacrificing strength or using thicker materials. That is, this invention achieves a midsole fabric with good breathability and moisture wicking while ensuring strength and lightweight.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bamboo fiber insole fabric, characterized in that, It includes a surface layer and a bottom layer. The surface layer is a fiber layer composed of 65-80% regenerated chemical fiber, 15-20% bamboo fiber, and 5-15% low melting point fiber, and the fiber layer has a microporous structure. The bottom layer is a cotton fabric layer, mainly composed of polyester-cotton blend. The fiber layer and the cotton fabric layer are fastened together by needle punching.

2. The bamboo fiber insole fabric according to claim 1, characterized in that, The recycled chemical fiber is recycled polyester staple fiber with a fineness of 1.2~6D.

3. The bamboo fiber insole fabric according to claim 1, characterized in that, The fineness of the bamboo fiber is 1.2~3.3D.

4. The bamboo fiber insole fabric according to claim 1, characterized in that, The low-melting-point fiber is Fuller low-melting-point fiber with a fineness of 2~4D.

5. The bamboo fiber insole fabric according to claim 1, characterized in that, The fiber layer is composed of 65-75% recycled polyester staple fiber, 15-20% bamboo fiber, and 10-15% Fuller low melting point fiber.

6. The bamboo fiber insole fabric according to claim 1, characterized in that, The microporous structure of the fiber layer is formed by needle punching.

7. The application of the bamboo fiber insole fabric according to any one of claims 1-6 in footwear products.

8. A method for preparing a bamboo fiber insole, characterized in that, include: After preparing the cotton fabric layer and the fiber layer separately, the two layers are combined by needle punching and then hot-pressed for shaping; The preparation of the fiber layer includes: mixing and opening 65-80% of regenerated chemical fiber, 15-20% of bamboo fiber and 5-15% of low melting point fiber, and then carding and laying the web.

9. The method for preparing bamboo fiber insole fabric according to claim 8, characterized in that, The preparation method includes the following steps: Opening: 65-75% recycled polyester staple fiber, 15-20% bamboo fiber and 10-15% Fuller low melting point fiber are put into the cotton mixer for the first opening and mixing, and then put into the opening machine for full opening. Carding: After opening, the material is fed into the carding machine under the control of the weighing control system. Web laying: The combed fiber web is fed to the web laying machine, where it is repeatedly folded and laid to form a fiber layer. Needle-punching composite: The fiber layer is drawn into the needle-punching machine through V-shaped feeding. The cotton fabric layer is placed behind the second needle-punching machine and then drawn to the surface of the fiber layer. Under the piercing action of the needle-punching machine, the fibers in the fiber layer interweave with each other, and the cotton fabric layer is composited onto the fiber layer through the needle-punching action. Hot pressing and shaping: Under the action of the heat press machine, the low melting point fibers in the fiber layer melt, and after cooling, the fiber layer and the cotton layer are firmly bonded together to form a bamboo fiber insole.

10. The method for preparing bamboo fiber insole fabric according to claim 9, characterized in that, The parameters of the carding machine are: Chest cylinder rotation speed: 23 Hz; Chest cylinder working roller speed: 20 Hz; Main cylinder speed: 42 Hz; Main cylinder working roll speed: 20 Hz; Feeding speed: 13.8 Hz; Dolph speed: 24.4 Hz; Pre-random speed: 8.3 Hz; Post-random speed: 13.2 Hz; The parameters of the screen laying machine are: Width of access to the network: 2050mm; Width of the mesh: 3427mm; Overlap coefficient: 90; Adjustment factor: 0.089; The parameters of the acupuncture machine are: The first acupuncture machine operates at a speed of 339 r / min. The second acupuncture machine operates at a speed of 1020 r / min. The third acupuncture machine operates at a speed of 899 r / min. The fourth acupuncture machine operates at a speed of 605 r / min. The fifth acupuncture machine operates at a speed of 659 r / min. The sixth needle puncture machine operates at a speed of 479 r / min. The seventh acupuncture machine operates at a speed of 650 r / min. Heat press machine parameters: Hot pressing stretching: 0.625 Hz; Lower shaft temperature: 210℃; Central axis temperature: 205℃; Upper shaft temperature: 210℃.

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