Light and thin stitch-bonded shoe insole non-woven fabric and preparation method and application thereof

Abstract

The invention provides a light and thin stitch-bonded shoe insole non-woven fabric as well as a preparation method and application thereof, and relates to the technical field of insole fabrics. The light and thin stitch-bonded shoe insole non-woven fabric is obtained by weaving and shaping 40wt%-60wt% of high-strength DTY (Draw Textured Yarn) and 60wt%-40wt% of high-strength FDY (Fully Drawn Yarn) fibers; the thickness of the insole non-woven fabric ranges from 0.4 mm to 0.8 mm. The high-strength DTY yarns and the high-strength FDY fibers are mixed according to a specific ratio, and are woven and shaped to obtain the insole cloth, the high elasticity of the DTY is complementary with the high strength and low shrinkage of the FDY, and the contradictory performance balance of lightness, thinness and toughness is realized, so that the insole cloth has the advantages that the thickness and weight of the insole cloth are reduced, and the service life of the insole cloth is prolonged. And good wear resistance, tensile strength and rupture strength can still be maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of midsole fabrics, and in particular to a light and thin stitched shoe midsole non-woven fabric, a preparation method thereof, and applications thereof. Background Art

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

[0003] As people's pursuit of a higher quality of life continues to rise, market demand for shoe midsole fabrics is also increasing. The main drawbacks of currently popular midsole fabrics include poor wear resistance (lack of abrasion resistance), poor softness, and poor puncture resistance. To enhance the wear resistance and strength of midsole fabrics, the common practice is to increase their thickness, but this compromises the breathability and comfort of the shoe. Therefore, achieving both lightness and strength in midsole fabrics remains a technical challenge in this field. Summary of the Invention

[0004] The present invention provides a thin and light stitched shoe midsole non-woven fabric, a preparation method and application thereof, so as to solve the defect that the midsole fabric in the prior art cannot be both thin and light and strong, thereby achieving a midsole non-woven fabric with good wear resistance and strength while achieving lightweight.

[0005] In a first aspect, the present invention provides a lightweight stitched shoe midsole non-woven fabric, which is obtained by weaving and shaping 40wt%-60wt% of high-strength DTY yarn and 60wt%-40wt% of high-strength FDY fiber; the thickness of the midsole non-woven fabric is 0.4-0.8mm.

[0006] According to the present invention, the thin and light stitched shoe midsole non-woven fabric has a thickness of 0.6±0.05 mm and is obtained by weaving and shaping 50±3wt% of high-strength DTY yarn and 50±3wt% of high-strength FDY fiber.

[0007] According to the light and thin stitched shoe midsole non-woven fabric provided by the present invention, the midsole non-woven fabric has a gram weight of 250-300g / m², a tensile strength of ≥300N / 2.54cm (GT / B3923.1-2013), and a bursting strength of ≥25kgf / cm 2 (GB / T7742.1-2005), wear resistance ≥8000 revolutions (Martindale test).

[0008] According to the light and thin stitched shoe midsole non-woven fabric provided by the present invention, the fineness of the high-strength DTY yarn is 200D, and the curling shrinkage rate thereof is 15%-25%.

[0009] According to the light and thin stitched shoe midsole non-woven fabric provided by the present invention, the high-strength DTY yarn is a high-gloss triangular shaped yarn.

[0010] According to the light and thin stitched shoe midsole non-woven fabric provided by the present invention, the breaking strength of the high-strength FDY fiber is ≥4.5 cN / dtex, and the thermal shrinkage rate is ≤5%.

[0011] According to the light and thin stitched shoe midsole non-woven fabric provided by the present invention, the high-strength FDY fiber is polyester fiber.

[0012] In a second aspect, the present invention provides the use of the above-mentioned light and thin stitched shoe midsole non-woven fabric in footwear products.

[0013] In a third aspect, the present invention provides a method for preparing the above-mentioned thin and light stitched shoe midsole non-woven fabric.

[0014] The preparation method provided by the present invention comprises: mixing, opening, carding and laying 40wt%-60wt% of high-strength DTY yarn and 60wt%-40wt% of high-strength FDY fiber to obtain a fiber web, stitching the web twice to obtain a grey cloth, impregnating the obtained grey cloth with acrylic emulsion and shaping the web at high temperature.

[0015] According to the preparation method provided by the present invention, in the carding process, the main cylinder rotation speed of the carding machine is 1200±10 Hz, and the main cylinder working roller rotation speed is 18±2 Hz; In the web laying process, the reciprocating curtain segment speeds of the web laying machine are: segment speed 1 is 1.3 Hz, segment speed 2 is 1.2 Hz, segment speed 3 is 1.1 Hz, segment speed 4 is 1.0 Hz, segment speed 5 is 1.0 Hz, segment speed 6 is 1.2 Hz, segment speed 7 is 1.3 Hz, and segment speed 8 is 1.4 Hz; the compensation roller segment speed is the same as the reciprocating curtain segment speed; The material output by the carding machine is transported to the web laying machine through a conveying curtain, and the parameters of the conveying curtain are: conveying curtain speed: 16±1 Hz, compensation curtain speed: 14±1 Hz.

[0016] According to the preparation method provided by the present invention, in the stitching process, the stitch length is 4-8 stitches / cm, and the suture tension is 15-35 cN.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a lightweight, stitched, non-woven shoe midsole fabric, a preparation method, and an application thereof. The midsole fabric is obtained by mixing high-strength DTY yarn and high-strength FDY fiber in a specific ratio, weaving, and shaping. The high elasticity of DTY complements the high strength and low shrinkage of FDY, achieving a "light-thin-tough" contradictory performance balance. As a result, the midsole fabric can maintain good wear resistance, tensile strength, and bursting strength while reducing thickness and weight. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] The endpoints of the ranges and any values ​​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 endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0020] In the description of this specification, the reference terms "one embodiment", "some embodiments", "specific implementation methods", or "some specific implementation methods" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0021] If no specific techniques or conditions are specified in the examples, the experiments were carried out according to the techniques or conditions described in the literature in the field or according to the product instructions. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased through regular channels.

[0022] The invention provides a light and thin stitched shoe midsole non-woven fabric, which is obtained by weaving and shaping 40wt%-60wt% of high-strength DTY yarn and 60wt%-40wt% of high-strength FDY fiber; the thickness of the midsole non-woven fabric is 0.4-0.8mm.

[0023] DTY (Draw Textured Yarn) is a drawn textured yarn produced by stretching and false-twisting polyurethane (POY) on a texturing machine. DTY yarn is characterized by its bulk, softness, elasticity, good hand feel, excellent coverage, and improved moisture absorption and breathability (compared to FDY). High-strength DTY yarn exhibits higher breaking strength and toughness than standard DTY.

[0024] FDY (Fully Drawn Yarn) is a fully drawn yarn that undergoes the entire spinning process, from spinning to drawing and heat setting, in a single step. FDY fibers feature high orientation, high crystallinity, high strength, high modulus, low elongation, a dense structure, and excellent dimensional stability. High-strength FDY fibers exhibit higher breaking strength and modulus than standard FDY fibers.

[0025] The present invention mixes high-strength DTY yarn and high-strength FDY fiber in a specific ratio, weaves and shapes them to obtain a midsole fabric, wherein the high elasticity of DTY complements the high strength and low shrinkage of FDY, achieving a "light and thin - strong and tough" contradictory performance balance, so that the midsole fabric can still maintain good wear resistance, tensile strength and bursting strength while reducing thickness and weight.

[0026] In a preferred embodiment of the present invention, the thin and light stitched shoe midsole non-woven fabric is obtained by weaving and shaping 50±3wt% of high-strength DTY yarn and 50±3wt% of high-strength FDY fiber, and has a thickness of 0.6±0.05mm.

[0027] Furthermore, in a preferred embodiment of the present invention, the midsole non-woven fabric has a gram weight of 250-300 g / m², a tensile strength of ≥300 N / 2.54 cm (GT / B3923.1-2013), and a burst strength of ≥25 kgf / cm 2 (GB / T7742.1-2005), wear resistance ≥8000 revolutions (Martindale test).

[0028] In some embodiments of the present invention, the fineness of the high-strength DTY yarn is 200D, and the crimp shrinkage rate is 15%-25%.

[0029] In the above technical solution, the 200D fineness provides sufficient single-filament stiffness to ensure that the curled structure does not collapse irreversibly under weaving tension; the curl shrinkage rate in the range of 15%-25% enables the yarn to maintain high strength properties (≥4.0cN / dtex) while still having a certain soft touch required for textile products, thus achieving a fineness-curl synergistic effect.

[0030] Furthermore, in some embodiments of the present invention, the high-strength DTY yarn is a glossy triangular shaped yarn.

[0031] The inherent crimp structure of DTY yarn imparts excellent loft, coverage, and elasticity. The triangular cross-section further enhances the yarn's fullness and volume, resulting in a fuller, thicker, and softer feel to the final fabric, enhancing wearer comfort and quality. The "glossy" characteristic, a unique optical effect that imparts a pleasant sheen to the yarn and final fabric ("glossy" effect), is often emphasized for its aesthetic appeal. This structural characteristic offers functional benefits (moisture wicking and quick drying) to the fabric. This synergistic effect, combined with the triangular cross-section, creates grooves that facilitate the formation of capillary channels between fibers. This enhances the yarn's and fabric's wicking capacity, promoting the rapid diffusion and evaporation of sweat or moisture along the longitudinal direction of the fibers. The high-strength DTY yarn of the present invention, utilizing glossy triangular shaped yarn, offers additional advantages, particularly for use in sportswear or outdoor apparel.

[0032] In some embodiments of the present invention, the breaking strength of the high-strength FDY fiber is ≥4.5 cN / dtex, and the thermal shrinkage is ≤5%.

[0033] In the above technical solution, high breaking strength means that the fiber can withstand huge tensile force without breaking easily, has high durability, can resist wear and impact during long-term use, is conducive to achieving lightweight, and can also improve processing performance. The thermal shrinkage rate affects dimensional stability. The present invention has found that selecting high-strength FDY fiber with a breaking strength and thermal shrinkage rate within the above range can make the resulting midsole fabric have better strength and production stability.

[0034] In some embodiments of the present invention, the high-strength FDY fiber is polyester fiber.

[0035] To further save energy and promote environmentally friendly production, the high-strength FDY fiber and high-strength DTY yarn used in the present invention are preferably made of recyclable raw materials. This saves resources, solves environmental pollution problems to the greatest extent, and meets energy conservation and emission reduction requirements.

[0036] In a second aspect, the present invention provides the use of the above-mentioned light and thin stitched shoe midsole non-woven fabric in footwear products.

[0037] The invention's application of this lightweight, stitched, midsole nonwoven fabric in footwear offers revolutionary advantages, perfectly meeting the modern footwear market's comprehensive demands for lightweight, high performance, comfort, and aesthetics. These advantages include: significant weight reduction for improved comfort and performance; high strength for stable support, sustained rebound, and exceptionally long life; a porous, moisture-wicking structure for superior breathability and perspiration management; effective shock absorption for foot joint protection; a unique, glossy finish for a revolutionary aesthetic breakthrough in sole design; and ease of processing, adaptable to a variety of shoemaking techniques. Specifically, this fabric is suitable for high-end running / training shoes, fashionable athletic / casual shoes, lightweight commuting / walking shoes, and children's shoes.

[0038] In a third aspect, the present invention provides a method for preparing the above-mentioned thin and light stitched shoe midsole non-woven fabric.

[0039] The preparation method provided by the present invention comprises: mixing, opening, carding and laying 40wt%-60wt% of high-strength DTY yarn and 60wt%-40wt% of high-strength FDY fiber to obtain a fiber web, stitching the web twice to obtain a grey cloth, impregnating the obtained grey cloth with acrylic emulsion and shaping the web at high temperature.

[0040] In the above-mentioned preparation method, the mixing, opening, carding, and web laying processes ensure uniform fiber dispersion and directional alignment. The stitchbonding process uses sewing thread to crochet, entwine, and bundle the fibers within the web into a single, integrated structure. This double stitchbonding process offers distinct advantages: the first stitchbonding forms the basic skeleton, providing initial strength and dimensional stability; the second stitchbonding reinforces and refines the initial structure, significantly improving the fabric's uniformity, tightness, delamination resistance, and overall strength. This "double insurance" mechanism ensures a robust fabric structure, allowing it to withstand significant stress even at a thin surface, resisting deformation or tearing, and laying a solid foundation for the final lightweight, high-strength product. Impregnation with acrylic emulsion allows the acrylic emulsion to penetrate the fiber gaps and stitchbond structure. After high-temperature setting, it cures into a film that encapsulates and bonds the fibers and stitching threads. This effectively forms a continuous polymer network throughout the nonwoven fabric, significantly enhancing interfiber and interlayer bonding, stiffness, dimensional stability, and abrasion resistance, further improving mechanical properties while imparting a certain rigidity and support.

[0041] In other words, the preparation method of the present invention, combined with a specific combination of fibers, significantly reduces the thickness and weight while improving the strength of the material, perfectly meeting the core requirement of the midsole cloth for a "light and thin midsole", and achieving an excellent balance of key performances such as high strength, high toughness, high dimensional stability, and good wear resistance. Moreover, the production process of the present invention is efficient, continuous, and controllable, and has good cost-effectiveness and environmental protection.

[0042] In some embodiments of the present invention, in the carding process, the main cylinder speed of the carding machine is 1200±10 Hz, and the main cylinder working roller speed is 18±2 Hz; In the web laying process, the reciprocating curtain segment speeds of the web laying machine are: segment speed 1 is 1.3 Hz, segment speed 2 is 1.2 Hz, segment speed 3 is 1.1 Hz, segment speed 4 is 1.0 Hz, segment speed 5 is 1.0 Hz, segment speed 6 is 1.2 Hz, segment speed 7 is 1.3 Hz, and segment speed 8 is 1.4 Hz; the compensation roller segment speed is the same as the reciprocating curtain segment speed; The material output by the carding machine is transported to the web laying machine through a conveying curtain, and the parameters of the conveying curtain are: conveying curtain speed: 16±1 Hz, compensation curtain speed: 14±1 Hz.

[0043] In some embodiments of the present invention, in the stitching process, the stitch length is 4-8 stitches / cm and the thread tension is 15-35 cN.

[0044] During the stitchbonding process, stitch length directly determines the density and degree of fiber entanglement in the stitchbond structure, which in turn affects the mechanical properties and uniformity of the resulting fabric. Stitch length also influences the penetration depth and distribution uniformity of the acrylic emulsion, requiring coordination with the impregnation process. Thread tension controls the tightness and shape of the stitchbond loops, directly impacting the dimensional stability and structural integrity of the fabric. Research conducted by the present inventors has found that controlling stitch length and thread tension within the above ranges can produce a midsole nonwoven fabric with excellent overall performance.

[0045] Further preferably, in the first stitching, the needle pitch is 4-5.5 needles / cm, and the thread tension is 15-25 cN; in the second stitching, the needle pitch is 6-8 needles / cm, and the thread tension is 25-35 cN.

[0046] In order to facilitate understanding of the light and thin stitched shoe midsole non-woven fabric and the preparation method thereof provided by the present invention, some specific embodiments and comparative examples are used for illustration below.

[0047] Example 1 This embodiment provides a midsole nonwoven fabric with a thickness of 0.6 mm, which is woven and shaped from 50 wt% high-strength DTY yarn and 50 wt% high-strength FDY fiber. The high-strength DTY yarn is a glossy triangular shaped yarn with a fineness of 200 denier and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of 4.5 cN / dtex or greater and a thermal shrinkage of 5% or less.

[0048] The specific preparation steps are as follows: (1) 50wt% high-strength DTY yarn and 50wt% high-strength FDY fiber are put into the cotton mixing machine for opening and mixing, and then further mixed in the large-bin cotton mixing machine, and then enter the opening machine for sufficient opening. After opening, they enter the carding machine, and the carded fiber web is transported to the web laying machine through the conveyor curtain. The web laying machine reciprocates to form layers of superimposed fiber webs, and the fiber webs are transported to the stitching machine through the leather curtain; the main cylinder speed of the carding machine is 1200 hz, the speed of the main cylinder working roller is 18hz; the reciprocating curtain section speeds of the web laying machine are: section speed 1 is 1.3hz, section speed 2 is 1.2hz, section speed 3 is 1.1hz, section speed 4 is 1.0hz, section speed 5 is 1.0hz, section speed 6 is 1.2hz, section speed 7 is 1.3hz, and section speed 8 is 1.4hz; the compensation roller section speed is the same as the reciprocating curtain section speed; the parameters of the conveying curtain are: conveying curtain speed: 16hz, compensation curtain speed: 14hz.

[0049] (2) A high-speed stitch-bonding machine is used to stitch the fiber web obtained in step (1) for the first time, with a stitch length of 4.5 stitches / cm and a stitch tension of 20 cN; after the first stitch-bonding is completed, a second stitch-bonding is performed with a stitch length of 7.2 stitches / cm and a stitch tension of 30 cN to obtain a grey cloth.

[0050] (3) The grey cloth obtained in step (2) is impregnated with acrylic emulsion, the emulsion is fully filled in the fiber, and then the excess emulsion is squeezed out with a padder, and then it is shaped by high-temperature drying and rolled.

[0051] Example 2 This embodiment provides a midsole nonwoven fabric with a thickness of 0.7 mm, which is woven and shaped from 60 wt% high-strength DTY yarn and 40 wt% high-strength FDY fiber. The high-strength DTY yarn is a glossy triangular shaped yarn with a fineness of 200 denier and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of 4.5 cN / dtex or greater and a thermal shrinkage of 5% or less.

[0052] The specific preparation steps are as follows: (1) 60wt% high-strength DTY yarn and 40wt% high-strength FDY fiber are put into the cotton mixing machine for opening and mixing, and then further mixed in the large-bin cotton mixing machine, and then enter the opening machine for sufficient opening. After opening, they enter the carding machine, and the carded fiber web is transported to the web laying machine through the conveyor curtain. The web laying machine reciprocates to form layers of superimposed fiber webs, and the fiber webs are transported to the stitching machine through the leather curtain; the main cylinder speed of the carding machine is 1200 hz, the speed of the main cylinder working roller is 18hz; the reciprocating curtain section speeds of the web laying machine are: section speed 1 is 1.3hz, section speed 2 is 1.2hz, section speed 3 is 1.1hz, section speed 4 is 1.0hz, section speed 5 is 1.0hz, section speed 6 is 1.2hz, section speed 7 is 1.3hz, and section speed 8 is 1.4hz; the compensation roller section speed is the same as the reciprocating curtain section speed; the parameters of the conveying curtain are: conveying curtain speed: 16hz, compensation curtain speed: 14hz.

[0053] (2) A high-speed stitch-bonding machine is used to stitch the fiber web obtained in step (1) for the first time, with a stitch length of 4.5 stitches / cm and a stitch tension of 20 cN; after the first stitch-bonding is completed, a second stitch-bonding is performed with a stitch length of 7.2 stitches / cm and a stitch tension of 30 cN to obtain a grey cloth.

[0054] (3) The grey cloth obtained in step (2) is impregnated with acrylic emulsion, the emulsion is fully filled in the fiber, and then the excess emulsion is squeezed out with a padder, and then it is shaped by high-temperature drying and rolled.

[0055] Example 3 This embodiment provides a midsole nonwoven fabric with a thickness of 0.5 mm, woven and shaped from 40 wt% high-strength DTY yarn and 60 wt% high-strength FDY fiber. The high-strength DTY yarn is a glossy triangular shaped yarn with a fineness of 200 denier and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of 4.5 cN / dtex or greater and a thermal shrinkage of 5% or less.

[0056] The specific preparation steps are as follows: (1) 40wt% high-strength DTY yarn and 60wt% high-strength FDY fiber are put into the cotton mixing machine for opening and mixing, and then further mixed in the large-bin cotton mixing machine, and then enter the opening machine for sufficient opening. After opening, they enter the carding machine, and the carded fiber web is transported to the web laying machine through the conveyor curtain. The web laying machine reciprocates to form layers of superimposed fiber webs, and the fiber webs are transported to the stitching machine through the leather curtain; the main cylinder speed of the carding machine is 1200 hz, the speed of the main cylinder working roller is 18hz; the reciprocating curtain section speeds of the web laying machine are: section speed 1 is 1.3hz, section speed 2 is 1.2hz, section speed 3 is 1.1hz, section speed 4 is 1.0hz, section speed 5 is 1.0hz, section speed 6 is 1.2hz, section speed 7 is 1.3hz, and section speed 8 is 1.4hz; the compensation roller section speed is the same as the reciprocating curtain section speed; the parameters of the conveying curtain are: conveying curtain speed: 16hz, compensation curtain speed: 14hz.

[0057] (2) A high-speed stitch-bonding machine is used to stitch the fiber web obtained in step (1) for the first time, with a stitch length of 4.5 stitches / cm and a stitch tension of 20 cN; after the first stitch-bonding is completed, a second stitch-bonding is performed with a stitch length of 7.2 stitches / cm and a stitch tension of 30 cN to obtain a grey cloth.

[0058] (3) The grey cloth obtained in step (2) is impregnated with acrylic emulsion, the emulsion is fully filled in the fiber, and then the excess emulsion is squeezed out with a padder, and then it is shaped by high-temperature drying and rolled.

[0059] Example 4 This example provides a midsole nonwoven fabric with a thickness of 0.6 mm. It is woven and shaped from 50 wt% high-strength DTY yarn and 50 wt% high-strength FDY fiber. The high-strength DTY yarn is a matte, round-cross-section yarn with a fineness of 200D and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of ≥4.5 cN / dtex and a thermal shrinkage of ≤5%. The preparation method is the same as in Example 1.

[0060] Example 5 This example provides a midsole nonwoven fabric with a thickness of 0.6 mm. It is woven and shaped from 50 wt% high-strength DTY yarn and 50 wt% high-strength FDY fiber. The high-strength DTY yarn is a high-gloss triangular shaped yarn with a fineness of 200D and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of 3.5 cN / dtex and a thermal shrinkage of 7%. The preparation method is the same as in Example 1.

[0061] Example 6 This embodiment provides a midsole nonwoven fabric with a thickness of 0.6 mm, which is woven and shaped from 50 wt% high-strength DTY yarn and 50 wt% high-strength FDY fiber. The high-strength DTY yarn is a glossy triangular shaped yarn with a fineness of 200 denier and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of 4.5 cN / dtex or greater and a thermal shrinkage of 5% or less.

[0062] The specific preparation steps are as follows: (1) 50wt% high-strength DTY yarn and 50wt% high-strength FDY fiber are put into the cotton mixing machine for opening and mixing, and then further mixed in the large-bin cotton mixing machine, and then enter the opening machine for sufficient opening. After opening, they enter the carding machine, and the carded fiber web is transported to the laying machine through the conveyor curtain. The laying machine reciprocates to form layers of superimposed fiber webs, and the fiber webs are transported to the sewing machine through the leather curtain; among them, the main cylinder speed of the carding machine is 1400hz, and the speed of the main cylinder working roller is 20hz; the reciprocating curtain section speed of the laying machine is: section speed 1 to section speed 8 are all 1.2hz; the compensation roller section speed is the same as the reciprocating curtain section speed; the parameters of the conveyor curtain are: conveyor curtain speed: 16hz, compensation curtain speed: 14hz.

[0063] (2) A high-speed stitch-bonding machine is used to stitch the fiber web obtained in step (1) for the first time, with a stitch length of 4.5 stitches / cm and a stitch tension of 20 cN; after the first stitch-bonding is completed, a second stitch-bonding is performed with a stitch length of 7.2 stitches / cm and a stitch tension of 30 cN to obtain a grey cloth.

[0064] (3) The grey cloth obtained in step (2) is impregnated with acrylic emulsion, the emulsion is fully filled in the fiber, and then the excess emulsion is squeezed out with a padder, and then it is shaped by high-temperature drying and rolled.

[0065] Example 7 This embodiment provides a midsole nonwoven fabric with a thickness of 0.6 mm, which is woven and shaped from 50 wt% high-strength DTY yarn and 50 wt% high-strength FDY fiber. The high-strength DTY yarn is a glossy triangular shaped yarn with a fineness of 200 denier and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of 4.5 cN / dtex or greater and a thermal shrinkage of 5% or less.

[0066] The specific preparation steps are as follows: (1) 50wt% high-strength DTY yarn and 50wt% high-strength FDY fiber are put into the cotton mixing machine for opening and mixing, and then further mixed in the large-bin cotton mixing machine, and then enter the opening machine for sufficient opening. After opening, they enter the carding machine, and the carded fiber web is transported to the web laying machine through the conveyor curtain. The web laying machine reciprocates to form layers of superimposed fiber webs, and the fiber webs are transported to the stitching machine through the leather curtain; the main cylinder speed of the carding machine is 1200 hz, the speed of the main cylinder working roller is 18hz; the reciprocating curtain section speeds of the web laying machine are: section speed 1 is 1.3hz, section speed 2 is 1.2hz, section speed 3 is 1.1hz, section speed 4 is 1.0hz, section speed 5 is 1.0hz, section speed 6 is 1.2hz, section speed 7 is 1.3hz, and section speed 8 is 1.4hz; the compensation roller section speed is the same as the reciprocating curtain section speed; the parameters of the conveying curtain are: conveying curtain speed: 16hz, compensation curtain speed: 14hz.

[0067] (2) A high-speed stitch-bonding machine is used to stitch the fiber web obtained in step (1) for the first time, with a stitch length of 6 stitches / cm and a stitch tension of 20 cN; after the first stitch-bonding is completed, a second stitch-bonding is performed with a stitch length of 6 stitches / cm and a stitch tension of 20 cN to obtain a grey cloth.

[0068] (3) The grey cloth obtained in step (2) is impregnated with acrylic emulsion, the emulsion is fully filled in the fiber, and then the excess emulsion is squeezed out with a padder, and then it is shaped by high-temperature drying and rolled.

[0069] Comparative Example 1 This comparative example provides a midsole nonwoven fabric with a thickness of 0.6 mm. It is woven and shaped from 80 wt% high-strength DTY yarn and 20 wt% high-strength FDY fiber. The high-strength DTY yarn is a glossy triangular shaped yarn with a fineness of 200D and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of ≥4.5 cN / dtex and a thermal shrinkage of ≤5%. The preparation method is the same as in Example 1.

[0070] Comparative Example 2 This comparative example provides a midsole nonwoven fabric with a thickness of 0.6 mm. It is made by mixing 50 wt% high-strength DTY yarn and 50 wt% high-strength FDY fiber, opening, carding, and laying to form a web, which is then thermally bonded. The high-strength DTY yarn is a high-gloss triangular shaped yarn with a fineness of 200 denier and a crimp shrinkage of 15%-25%. The high-strength FDY fiber is a polyester fiber with a breaking strength of ≥4.5 cN / dtex and a thermal shrinkage of ≤5%.

[0071] The specific preparation steps are as follows: (1) 50wt% high-strength DTY yarn and 50wt% high-strength FDY fiber are put into the cotton mixing machine for opening and mixing, and then further mixed in the large-bin cotton mixing machine, and then enter the opening machine for sufficient opening. After opening, they enter the carding machine, and the carded fiber web is transported to the web laying machine through the conveyor curtain. The web laying machine reciprocates to form layers of superimposed fiber webs; among them, the main cylinder speed of the carding machine is 1200hz, and the main cylinder The working roller speed is 18 Hz; the reciprocating curtain section speeds of the web laying machine are: section speed 1 is 1.3 Hz, section speed 2 is 1.2 Hz, section speed 3 is 1.1 Hz, section speed 4 is 1.0 Hz, section speed 5 is 1.0 Hz, section speed 6 is 1.2 Hz, section speed 7 is 1.3 Hz, and section speed 8 is 1.4 Hz; the compensation roller section speed is the same as the reciprocating curtain section speed; the conveying curtain parameters are: conveying curtain speed: 16 Hz, compensation curtain speed: 14 Hz.

[0072] (2) Add 15% low-melting-point fiber to the fiber web obtained in step (1) and perform hot-air bonding.

[0073] Performance Testing Test basis: Weight: Tested according to GB / T4669-2008.

[0074] Bursting strength: This index indicates the maximum pressure that the fabric can resist bursting, which directly affects the puncture resistance of the midsole fabric. The test is based on GB / T7742.1-2005, and the standard value is ≥25kgf / cm 2 .

[0075] Longitudinal tensile strength: GB / T 3923.1-2013, standard value ≥250N / 2.54cm.

[0076] Transverse tensile strength: GB / T 3923.1-2013, standard value ≥200N / 2.54cm.

[0077] Longitudinal 100N elongation: GB / T 3923.1-2013, standard value ≤5%.

[0078] Transverse 100N elongation at fixed strength: GB / T 3923.1-2013, standard value ≤15%.

[0079] Abrasion resistance: The test method refers to GB / T 3903.16-2008, the Martindale test. The Martindale test is an internationally recognized standardized method for measuring fabric abrasion resistance, pilling resistance, and appearance retention. It is widely used to evaluate the durability of textiles, leather, non-woven fabrics, and other materials. Specifically, the sample is fixed to a platform and subjected to Lissajous path friction (multi-directional cyclic motion) at a set pressure (9 kPa) using a standard abrasive (such as wool felt), simulating the complex wear and tear experienced in actual use. The number of friction cycles (rotations) required for a hole to form is recorded; a higher value indicates greater wear resistance.

[0080] Moisture absorption: This is used to evaluate the ability of midsole non-woven fabrics to absorb and transfer liquid water (sweat). It is the key to affecting the dryness of the feet. The test is based on GB / T21655.1-2008. The results are expressed as wicking height (mm). The higher the value, the faster the material absorbs and vertically transports liquid water, and the stronger its ability.

[0081] The test results are shown in Table 1.

[0082] Table 1

[0083] From the above results, it can be seen that the comprehensive performance of the midsole non-woven fabrics of Examples 1-3 of the present invention is better, among which Example 1 is better. In Example 4, the high-strength DTY yarn did not use the glossy triangular shaped yarn, so the resulting midsole fabric has poor moisture absorption. In Example 5, the breaking strength and thermal shrinkage of the high-strength FDY fiber are not within the optimal range, so the comprehensive performance of the resulting midsole fabric is not as good as that of Example 1. Due to the different preparation parameters in Examples 6 and 7, the comprehensive performance is not as good as that of Example 1. Comparative Example 1 did not adopt the formula of the present invention, and the ratio of the two fibers was not within the specific ratio of the present invention. Even if the preparation method was the same, the beneficial effects of Example 1 could not be achieved. Although Comparative Example 2 used the same formula as Example 1, the preparation step was direct thermal bonding after obtaining the fiber web, rather than the secondary stitching and acrylic emulsion impregnation, drying and shaping of the present invention, so the performance of the resulting product was not good.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A thin and light stitched shoe midsole non-woven fabric, characterized in that: The midsole non-woven fabric is obtained by weaving and shaping 40wt%-60wt% of high-strength DTY yarn and 60wt%-40wt% of high-strength FDY fiber; the high-strength DTY yarn is a glossy triangular shaped yarn with a fineness of 200D and a crimp shrinkage rate of 15%-25%; the high-strength FDY fiber has a breaking strength of ≥4.5cN / dtex and a thermal shrinkage rate of ≤5%; the thickness of the midsole non-woven fabric is 0.4-0.8mm.

2. The thin and light stitched shoe midsole non-woven fabric according to claim 1, characterized in that: The midsole non-woven fabric has a thickness of 0.6±0.05 mm and is obtained by weaving and shaping 50±3wt% of high-strength DTY yarn and 50±3wt% of high-strength FDY fiber.

3. The thin and light stitched shoe midsole non-woven fabric according to claim 2, characterized in that: The midsole non-woven fabric has a gram weight of 250-300g / m², a tensile strength of ≥300N / 2.54cm, and a burst strength of ≥25kgf / cm 2 , wear resistance ≥8000 revolutions.

4. Use of the light and thin stitched shoe midsole non-woven fabric according to any one of claims 1 to 3 in footwear products.

5. The method for preparing the thin and light stitched shoe midsole non-woven fabric according to any one of claims 1 to 3, characterized in that: include: 40wt%-60wt% of high-strength DTY yarn and 60wt%-40wt% of high-strength FDY fiber are mixed, opened, carded and laid to obtain a fiber web, which is then stitched twice to obtain a grey cloth. The obtained grey cloth is then impregnated with acrylic emulsion and shaped at high temperature.

6. The method for preparing the thin and light stitched shoe midsole non-woven fabric according to claim 5, characterized in that: During the carding process, the main cylinder speed of the carding machine is 1200±10hz, and the main cylinder working roller speed is 18±2hz; In the web laying process, the reciprocating curtain segment speeds of the web laying machine are: segment speed 1 is 1.3 Hz, segment speed 2 is 1.2 Hz, segment speed 3 is 1.1 Hz, segment speed 4 is 1.0 Hz, segment speed 5 is 1.0 Hz, segment speed 6 is 1.2 Hz, segment speed 7 is 1.3 Hz, and segment speed 8 is 1.4 Hz; the compensation roller segment speed is the same as the reciprocating curtain segment speed; The material produced by the carding machine is transported to the web laying machine through a conveying curtain, and the parameters of the conveying curtain are: conveying curtain speed: 16±1 Hz, compensation curtain speed: 14±1 Hz.

7. The method for preparing the thin and light stitched shoe midsole non-woven fabric according to claim 5, characterized in that: During the stitching process, the stitch length is 4-8 stitches / cm and the thread tension is 15-35 cN.

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