A stretch-resistant anti-wrinkle knitted fabric and a method of making the same

Abstract

The application relates to the technical field of knitted fabrics, and particularly discloses a stretch-resistant and wrinkle-resistant knitted fabric and a preparation method thereof. The knitted fabric adopts a three-layer composite structure: an anti-wrinkle and wear-resistant layer as a surface layer, a comfortable and skin-friendly layer as an inner layer, and a reinforcing layer formed by interlacing horizontal and vertical composite yarns into a grid shape as an intermediate layer. The composite yarns are composed of high-performance fiber filaments coated with a low-melting-point polyamide wrapping layer. After heat setting, the polyamide is melted to form biomimetic anchor points penetrating through the three layers, greatly enhancing the interlayer bonding force. The surface layer is further coated with a nano-silicon dioxide-polyurethane composite film to further improve the performance. The preparation method comprises knitting, integral forming, magnetron sputtering surface deposition and zoned continuous heat pressing and setting. Through structural innovation and process optimization, the single fabric has excellent stretch resistance, wrinkle resistance, durability and comfort, effectively prevents delamination and deformation, and has efficient and environmentally-friendly production process, and is suitable for large-scale application.

Description

Technical Field

[0001] This invention relates to the field of knitted fabric technology, specifically to a tensile and wrinkle-resistant knitted fabric and its preparation method. Background Technology

[0002] Knitted fabric is a type of fabric formed by bending yarns into loops and interlocking them using knitting needles. It is divided into warp-knitted fabric and weft-knitted fabric. Knitted fabrics are soft, moisture-wicking, breathable, and warm, and most of them have excellent elasticity and extensibility.

[0003] Currently, Chinese patent application number CN202321187480.8 discloses a highly elastic and wrinkle-resistant knitted fabric, comprising: a knitted fabric having an upper knitted fabric layer and a lower knitted fabric layer, wherein the surface of the upper knitted fabric layer is interwoven with a first elastic fiber in a satin pattern, and the surface of the first elastic fiber is interwoven with a second elastic fiber in a satin pattern, wherein the first elastic fiber and the second elastic fiber are spandex fiber yarns.

[0004] However, existing tensile and wrinkle-resistant knitted fabrics rely on spandex fibers to provide elasticity, rather than fundamentally solving the structural tensile problem, and are still prone to structural loosening after long-term use; secondly, the structure is only two simple layers superimposed, and the layers are only connected by interlacing, with limited bonding force, and there is still a risk of delamination during use; furthermore, this method is not convenient to solve the problem of insufficient abrasion resistance and durability of the fabric. Summary of the Invention

[0005] The purpose of this invention is to provide a tensile and wrinkle-resistant knitted fabric and its preparation method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a tensile and wrinkle-resistant knitted fabric, comprising an outer layer composed of surface yarns, an inner layer composed of inner yarns, and an intermediate layer embedded between the two; the intermediate layer comprises a base fabric layer and transverse composite yarns and longitudinal composite yarns interlaced and embedded within the base fabric layer, the transverse composite yarns and longitudinal composite yarns being distributed in an interlaced manner to form a mesh; the transverse composite yarns and longitudinal composite yarns have the same structure and size, each comprising two first fiber filaments and a second fiber filament woven together, and a low-melting-point polyamide coating layer completely wrapped around the outer surface of the first fiber filament and the second fiber filament;

[0007] After heat setting, the low-melting-point polyamide coating layer melts to form anchoring points that anchor the outer, middle, and inner layers together. The outer surface of the outer layer is also covered with a nano-silica-polyurethane composite film.

[0008] Preferably, both the first and second fiber filaments are high-strength, high-modulus polyethylene fiber filaments or aromatic polyamide fiber filaments.

[0009] Preferably, the base fabric layer is a thin mesh woven fabric made of meltable fibers;

[0010] Preferably, the spacing between the transverse composite yarn and the longitudinal composite yarn is 3-5 mm.

[0011] Preferably, the melting point of the low-melting-point polyamide coating is 110-130°C, and the distribution density of the anchoring points is 50-200 per square decimeter.

[0012] In addition, the present invention also provides a method for preparing a tensile and wrinkle-resistant knitted fabric, which includes the following steps:

[0013] S1. Provides a surface yarn, a middle layer yarn, and an inner layer yarn; the surface yarn is a blend of polyester-based shape memory fiber and conductive metal fiber; the inner layer yarn is a natural cellulose fiber or regenerated cellulose fiber yarn.

[0014] S2. Using a double-sided circular knitting machine, the outer layer yarn is used to knit the outer layer loops, the inner layer yarn is used to knit the inner layer loops, and the middle layer is embedded between the outer layer and the inner layer loops in a grid-like weft insertion manner to form a knitted fabric.

[0015] S3. Pre-treat the knitted fabric to remove spinning and weaving oils;

[0016] S4. The pretreated knitted fabric is introduced into a bipolar pulse magnetron sputtering and atomization injection combined equipment. Inorganic target material is sputtered by magnetron sputtering target material, and organic monomer solution is atomized and sprayed onto the fabric surface by organic monomer atomization injection device, forming a nano-inorganic-organic composite film in situ on the fabric surface.

[0017] S5. The knitted fabric treated in step S4 is heat-set under a preset tension using a hot pressing device. The treatment temperature is higher than the melting point of the low-melting-point polyamide coating layer but lower than the softening point of other fibers. The heat treatment time is 3-5 minutes. The low-melting-point polyamide coating layer in the middle layer melts, and the melt forms biomimetic anchoring points between the outer and inner layers under capillary action, thereby obtaining the tensile and wrinkle-resistant knitted fabric.

[0018] Preferably, the inorganic target material in step S4 is a silicon target, the sputtering atmosphere is a mixture of argon and oxygen, the organic monomer solution is a polyurethane prepolymer solution, and the composite film formed by in-situ deposition is a silicon dioxide-polyurethane composite film.

[0019] Preferably, the hot pressing equipment includes a hot pressing hood, with partitions on both the left and right sides inside the hot pressing hood to divide the interior into a heating chamber, a pressing chamber, and a cooling chamber from left to right. A guide roller is positioned above the channel inside the partition on the left side. The heating chamber includes a guide roller installed near the left side feed inlet of the hot pressing hood and a hot air blower body positioned to the right of the guide roller. Hot air is blown out from both the upper and lower sides of the hot air blower body. The pressing chamber includes a support frame whose bottom is fastened to the hot pressing hood, with drive rollers on both the left and right sides inside the support frame. The main body of the moving roller is equipped with rotating rollers at the top of the support near the two main bodies of the driving rollers. An electric heating worktable is embedded in the top side of the support. A pressure structure is provided at the top of the support, and the top of the pressure structure is connected to the hot press cover. The cooling chamber includes an upper air-cooled guide platform and a lower air-cooled guide platform with the same structure and size and arranged symmetrically in opposite directions. A first support roller is provided at the internal channel of the partition near the right side of the upper air-cooled guide platform, and a second support roller is provided at the discharge point on the right side of the hot press cover of the lower air-cooled guide platform.

[0020] Preferably, the point pressure structure includes a support platform, with four guide columns sliding through the center of the support platform, and the tops of the guide columns being fixed to the hot press cover seat. The top left and right sides of the support platform are respectively connected to a first lifting and pressing assembly and a second lifting and pressing assembly with the same structure and size, and the bottom four sides of the support platform are connected to pressure bead assemblies, which are located above the electric heating workbench.

[0021] Preferably, the first lifting and pressing assembly includes a rectangular seat whose top is fastened to the hot press cover seat. A first motor is locked and fixed inside the lower right side of the rectangular seat. The top output shaft of the first motor is connected to a worm gear, and a worm wheel is engaged with the left side of the worm gear. An eccentric push rod is connected to the middle rotating shaft on both the front and rear sides of the worm wheel. The tops of the two eccentric push rods are respectively rotatably connected to the front and rear sides of the support rod. The left side of the support rod is rotatably connected to the rectangular seat. The right side of the support rod is U-shaped, and a sliding sleeve is connected inside the U-shaped opening. A column slides longitudinally through the sliding sleeve, and the right side of the sliding sleeve is fastened to the carrier frame. The top of the column is fixed to the rectangular seat, and the bottom of the carrier frame is fastened to the support platform.

[0022] Preferably, the ball bearing assembly includes four columns that are fastened to the top and four sides of the support. The bottom of each of the four columns is locked and fixed to the carrier plate. A driven pulley is rotatably connected to the top center of the carrier plate. The left side of the outer surface of the driven pulley is connected to the driving pulley via a belt. The top center of the driving pulley is connected to the bottom output shaft of the second motor, and the left side of the second motor is fastened to the support. A rectangular groove is provided on the top center of the carrier plate. A horizontal bar is arranged inside the driven pulley, and a sliding displacement block is wrapped around one side of the outer surface of the horizontal bar. The bottom of the displacement block is inserted into and slides inside the rectangular groove, and the top of the displacement block is rotatably connected to the gantry frame. A lower sliding plate is locked and fixed to the bottom of the gantry frame. The top center of the lower sliding plate is slidably connected to the upper sliding plate. The top center of the upper sliding plate is slidably connected to the carrier plate. Ball bearings are arranged in a rectangular pattern at the bottom of the lower sliding plate.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This invention achieves enhanced fabric performance and multifunctional integration through a three-layer composite structure consisting of an outer layer, a middle layer, and an inner layer, along with functional surface treatment. The outer layer imparts excellent wrinkle resistance and abrasion resistance to the fabric, the inner layer ensures a comfortable, skin-friendly feel, and the core of the middle layer's mesh-reinforced structure provides superior and balanced all-directional tensile strength. Furthermore, the nanocomposite film covering the outer layer further enhances durability, enabling a single fabric to simultaneously possess the comprehensive performance that previously required multiple fabric layers or complex finishing processes.

[0025] The biomimetic anchoring mechanism employed in this invention significantly enhances the structural stability and durability of the fabric. Through a heat-setting process, the low-melting-point polyamide coating layer in the middle layer melts and forms a "chemical rivet" anchor point that runs through all three layers, greatly improving the interlayer bonding force and effectively preventing problems such as delamination, slippage, or bubbling during use. The robust integrated structure ensures that the fabric maintains good shape stability and physical properties even after repeated stretching, washing, and wearing, thus extending its service life.

[0026] The preparation process of this invention is efficient, environmentally friendly, and easy to implement for continuous production. From knitting and molding to magnetron sputtering dry surface treatment, and then to zoned continuous hot pressing and shaping, the entire process flow is smooth and avoids the high energy consumption and wastewater discharge problems caused by multiple immersion and baking in traditional processes. Furthermore, the optimized hot pressing equipment integrates the three processes of preheating, pressing, and cooling into one, with a high degree of automation. This not only allows for precise control of key process parameters and ensures the consistency of product quality, but also greatly improves production efficiency, making it suitable for large-scale industrial applications. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the tensile and wrinkle-resistant knitted fabric of the present invention;

[0028] Figure 2 This is a partial structural diagram of the intermediate layer of the present invention;

[0029] Figure 3 This is a partial top view of the structure connecting the base fabric layer, the transverse composite yarn, and the longitudinal composite yarn of the present invention.

[0030] Figure 4 This is a schematic diagram of the transverse composite yarn of the present invention;

[0031] Figure 5 This is a schematic diagram of the hot pressing equipment of the present invention;

[0032] Figure 6 This is a schematic diagram of the point-pressure structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the first lifting and pressing component of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the bead pressing assembly of the present invention;

[0035] Figure 9 This is a top view of the bead pressing assembly of the present invention.

[0036] In the diagram: Outer layer-1, Middle layer-2, Inner layer-3, Nano-silica-polyurethane composite film-4, Base fabric layer-21, Transverse composite yarn-22, Longitudinal composite yarn-23, First fiber filament-221, Second fiber filament-222, Low melting point polyamide coating layer-223, Hot press cover-5, Guide roller-51, Heating chamber-6, Pressing chamber-7, Cooling chamber-8, Guide roller-61, Air-heated main body-62, Support-71, Drive roller main body-72, Rotary roller-73, Electric heating worktable-74, Point pressing structure-75, Lower air-cooled guide table-81, Upper air-cooled guide table-82, Support-751, Guide column-752, First lifting Pressure assembly - 753, second lifting and pressure assembly - 754, pressure ball assembly - 755, rectangular seat - 7531, first motor - 7532, worm gear - 7533, worm wheel - 7534, eccentric push rod - 7535, support rod - 7536, sliding sleeve - 7537, column - 7538, carrier frame - 7539, column rod - 7551, carrier plate - 7552, driven pulley - 7553, belt - 7554, driving pulley - 7555, second motor - 7556, shifting block - 7557, gantry frame - 7558, lower sliding plate - 7559, upper sliding plate - 75510, ball bearing - 75511, rectangular groove - 75521. Detailed Implementation

[0037] To further explain the technical solution of the present invention, a detailed description is provided below through specific embodiments.

[0038] Please see Figures 1-4 The present invention provides a tensile and wrinkle-resistant knitted fabric, comprising an outer layer 1 composed of surface yarns, an inner layer 3 composed of inner yarns, and an intermediate layer 2 embedded between the two. The outer layer 1 is mainly responsible for wrinkle resistance and abrasion resistance, the inner layer 3 ensures comfort and skin-friendliness, and the intermediate layer 2 provides tensile support, thereby comprehensively improving the overall performance of the fabric.

[0039] The intermediate layer 2 includes a base fabric layer 21 and transverse composite yarns 22 and longitudinal composite yarns 23 that are interlaced and embedded inside the base fabric layer 21. The transverse composite yarns 22 and longitudinal composite yarns 23 are interlaced to form a mesh, providing the fabric with isotropic and balanced high tensile strength, effectively preventing unidirectional or anisotropic deformation of the fabric during use. The transverse composite yarns 22 and longitudinal composite yarns 23 have the same structure and size, and include two first fiber filaments 221 and second fiber filaments 222 that are woven together, as well as a low-melting-point polyamide coating layer 223 that completely wraps the outer surface of the first fiber filaments 221 and the second fiber filaments 222. The two high-performance fiber filaments can provide extremely high tensile strength through interlacing, and the outer low-melting-point polyamide coating layer 223 prepares for the formation of strong interlayer anchoring points during the subsequent heat setting process.

[0040] After heat setting, the low-melting-point polyamide coating layer 223 melts to form anchoring points that anchor the outer layer 1, the middle layer 2, and the inner layer 3 together. The molten anchoring points act like "chemical rivets" to tightly fix the three-layer structure, greatly improving the interlayer bonding force and peel resistance. The outer surface of the outer layer 1 is also covered with a layer of nano-silica-polyurethane composite film 4 to further enhance the fabric's abrasion resistance, wrinkle resistance, and durability.

[0041] The first fiber filament 221 and the second fiber filament 222 are both high-strength, high-modulus polyethylene fiber filaments or aromatic polyamide fiber filaments. The use of ultra-high strength and high modulus fibers ensures that the middle layer 2 mesh can bear most of the tensile stress, thus guaranteeing the fabric's excellent tensile strength. The base fabric layer 21 is a thin mesh woven fabric made of meltable fibers, which allows it to not only support the reinforcing yarns during heat setting, but also to participate in melting and fuse with the low-melting-point polyamide coating layer 223, forming a stronger and more coherent mesh anchoring structure, further enhancing the interlayer bonding force. The spacing between the transverse composite yarn 22 and the longitudinal composite yarn 23 is 3-5 mm, and the melting point of the low-melting-point polyamide coating layer 223 is 110-130℃, ensuring that heat setting can be carried out without damaging other fibers. The distribution density of anchoring points is 50-200 per square decimeter to ensure the effectiveness and uniformity of the anchoring effect.

[0042] Please see Figures 1-9 This invention provides a method for preparing a tensile and wrinkle-resistant knitted fabric, which includes the following steps:

[0043] S1. Provides surface yarn, middle layer yarn and inner layer yarn; the surface yarn is a blend of polyester-based shape memory fiber and conductive metal fiber. The shape memory fiber gives the fabric good wrinkle recovery ability, and the trace conductive fiber provides a base for the subsequent magnetron sputtering process; the inner layer yarn is natural cellulose fiber or regenerated cellulose fiber yarn. Natural or regenerated cellulose fiber ensures the comfort and moisture-wicking breathability of the final product against the skin.

[0044] S2. Using a double-sided circular knitting machine, the outer layer yarn is used to weave the outer loop, the inner layer yarn is used to weave the inner loop, and the middle layer 2 is embedded between the outer and inner loops in a grid-like weft insertion method to form a knitted fabric. This forms a sandwich structure in one step. The middle layer is embedded in a weft insertion method, which avoids complex post-composite processes, resulting in high efficiency and a stable structure.

[0045] S3. Pre-treat the knitted fabric to remove spinning and weaving oils to ensure it has a clean surface;

[0046] S4. The pretreated knitted fabric is introduced into a bipolar pulse magnetron sputtering and atomization injection combined equipment. Inorganic target material is sputtered by magnetron sputtering, and organic monomer solution is atomized and sprayed onto the fabric surface by an organic monomer atomization injection device. A nano-inorganic-organic composite film is deposited in situ on the fabric surface. This composite deposition technology can generate a flexible and strong nano-composite film in situ. It has strong bonding with the fabric and can significantly improve the wear resistance, wrinkle resistance and functional properties of the fabric surface. Moreover, the process is low temperature, dry, environmentally friendly and causes little damage to the fabric.

[0047] S5. The knitted fabric treated in step S4 is heat-set under a preset tension by a hot pressing device. The treatment temperature is higher than the melting point of the low-melting-point polyamide coating layer 223 but lower than the softening point of other fibers. The heat treatment time is 3-5 minutes. The low-melting-point polyamide coating layer 223 of the middle layer 2 is melted. The melt forms a biomimetic anchoring point between the outer layer 1 and the inner layer 3 under capillary action, thereby obtaining a tensile and wrinkle-resistant knitted fabric.

[0048] In step S4, the inorganic target is a silicon target, the sputtering atmosphere is a mixture of argon and oxygen, the organic monomer solution is a polyurethane prepolymer solution, and the composite film formed by in-situ deposition is a silica-polyurethane composite film, which combines the high hardness and wear resistance of silica with the flexibility and high adhesion of PU, making it an ideal functional film for textile surfaces.

[0049] The hot pressing equipment includes a hot pressing hood 5. Partitions are set on both the left and right sides inside the hot pressing hood 5 to divide the inside of the hot pressing hood 5 into a heating chamber 6, a pressing chamber 7 and a cooling chamber 8 from left to right. Through the partition design, the three processes of preheating, pressing and anchoring and cooling and shaping can be completed continuously in one piece of equipment, which greatly improves production efficiency. A guide roller 51 is set above the channel inside the partition on the left side to smoothly guide the fabric from the heating chamber 6 into the pressing chamber 7 to prevent the fabric from wrinkling or getting stuck.

[0050] Heating chamber 6 includes a guide roller 61 installed near the left feed port of hot press hood 5 and a hot air body 62 located on the right side of the guide roller 61. The hot air body 62 blows hot air out from both sides. The hot air convection heating method can make the fabric heat evenly and quickly on both sides, achieving rapid and uniform preheating, and preparing for subsequent pressing and anchoring. Pressing chamber 7 includes a bracket 71 whose bottom is fastened to the hot press hood 5. The bracket 71 has drive roller bodies 72 on both the left and right sides. The top of the bracket 71 is rotatably mounted near the two drive roller bodies 72. Through the joint action of the drive roller bodies 72 and the rotating rollers 73, the fabric is pulled and transported through the pressing chamber 7 with a preset tension, ensuring that the fabric is in an ideal state of flatness and tension when under pressure.

[0051] An electric heating worktable 74 is embedded in the top side of the bracket 71. A pressure structure 75 is set on the top of the bracket 71, and the top of the pressure structure 75 is connected to the hot press cover 5 to provide a stable and uniform bottom heat source for the pressing chamber 7. In conjunction with the pressure structure 75 above, the fabric is heated and pressurized, causing the low melting point polyamide coating layer 223 to melt and flow. The cooling chamber 8 includes an upper air-cooled guide platform 82 and a lower air-cooled guide platform 81 with the same structure and size and arranged symmetrically in opposite directions. The pressed fabric is subjected to rapid and uniform forced cooling on both sides, instantly solidifying and shaping the molten low melting point polyamide coating layer 223 and the anchoring structure it forms, locking in the best performance. The upper air-cooled guide platform 82 is provided with a first support roller in the internal channel of the partition near the right side, and the lower air-cooled guide platform 81 is provided with a second support roller in the outlet position near the right side of the hot press cover 5. These support rollers are used to support and guide the fabric through the cooling zone, prevent loosening and friction, and ensure flat cooling and smooth discharge.

[0052] The point-pressing structure 75 includes a support platform 751. Four guide columns 752 slide through the center of the support platform 751, and the top of the guide columns 752 is fixed to the hot press cover 5. The guide columns 752 provide precise vertical guidance for the support platform 751, ensuring that its lifting and lowering movements are smooth and without deviation, thereby ensuring the uniformity and consistency of pressure application. The top left and right sides of the support platform 751 are respectively connected to the first lifting and pressing assembly 753 and the second lifting and pressing assembly 754 with the same structure and size. The bottom four sides of the support platform 751 are connected to the pressure ball assembly 755. The pressure ball assembly 755 is located above the electric heating worktable 74. It is powered by the lifting and pressing assemblies on both sides to drive the entire point-pressing structure 75 to perform regular lifting and pressing movements. The pressure ball assembly 755 at the bottom is the part that directly performs the "point-pressing" function. The balls on it will roll and press on the fabric surface.

[0053] The first lifting and pressing assembly 753 includes a rectangular seat 7531 whose top is fastened to the hot press cover 5. A first motor 7532 is locked and fixed inside the lower right side of the rectangular seat 7531. The top output shaft of the first motor 7532 is connected to a worm gear 7533, and a worm wheel 7534 is meshed and driven on the left side of the worm gear 7533. An eccentric push rod 7535 is connected to the center of the front and rear sides of the worm wheel 7534. The tops of the two eccentric push rods 7535 are rotatably connected to the front and rear sides of the support rod 7536, respectively. The first motor 7532 provides driving force to convert the rotational motion of the worm wheel 7534 into the eccentric rotational motion of the eccentric push rod 7535, thereby providing the power for lifting and lowering the support rod 7536.

[0054] The left side of the support rod 7536 is rotatably connected to the rectangular seat 7531, and the right side of the support rod 7536 is U-shaped, with a sliding sleeve 7537 connected inside the U-shaped opening. A column 7538 slides longitudinally through the sliding sleeve 7537, and the right side of the sliding sleeve 7537 is fastened to the carrier 7539. The top of the column 7538 is fixed to the rectangular seat 7531, and the bottom of the carrier 7539 is fastened to the support platform 751. The rotational motion of the eccentric push rod 7535 is ultimately converted into the precise linear reciprocating motion of the support platform 751. The sliding cooperation between the sliding sleeve 7537 and the column 7538 ensures the linearity and stability of the motion, thereby driving the pressure bead assembly 755 to precisely press the fabric.

[0055] The ball bearing assembly 755 includes four columns 7551 that are fastened to the top and four sides of the support 751. The bottom of each column 7551 is locked to the carrier plate 7552. The columns 7551 and the carrier plate 7552 form a sturdy frame for supporting and installing internal moving parts, ensuring structural stability during operation. A driven pulley 7553 is rotatably connected to the top center of the carrier plate 7552. The left side of the outer surface of the driven pulley 7553 is connected to the driving pulley 7555 via a belt 7554. The top center of the driving pulley 7555 is connected to the bottom output shaft of the second motor 7556. The left side of the second motor 7556 is fastened to the support 751. The second motor 7556 drives the driven pulley 7553 to rotate through the pulley transmission mechanism to transmit power to the next stage mechanism.

[0056] A rectangular groove 75521 is provided on the top center side of the carrier plate 7552. A straight bar is arranged horizontally inside the driven pulley 7553, and a displacement block 7557 is slidably wrapped around one side of the outer surface of the straight bar. The bottom of the displacement block 7557 is inserted into and slides inside the rectangular groove 75521. The straight bar is equivalent to a crank, and the displacement block 7557 is equivalent to a slider, forming a crank-slider mechanism, so that the rotational motion of the driven pulley 7553 is converted into the movement of the displacement block 7557 along the trajectory of the rectangular groove 75521.

[0057] Furthermore, the top of the shift block 7557 is rotatably connected to the gantry frame 7558, and the lower sliding plate 7559 is locked and fixed inside the bottom side of the gantry frame 7558. The top middle side of the lower sliding plate 7559 is laterally slidably connected to the upper sliding plate 75510, and the top middle side of the upper sliding plate 75510 is slidably connected to the carrier plate 7552. This transforms the rectangular trajectory movement of the shift block 7557 into the rectangular trajectory shifting movement of the lower sliding plate 7559 in the XY plane, so that the final pressing action is not a simple vertical impact, but has a certain lateral rubbing motion, which is more conducive to the penetration and distribution of the molten polymer.

[0058] The bottom of the sliding plate 7559 has a rectangular arrangement of ball bearings 75511. Multiple ball bearings 75511 serve as the final actuators. The matrix arrangement ensures the uniformity and comprehensiveness of the pressure application. Rolling point pressure is applied to the heated fabric surface. This "point contact" pressure can generate extremely high local pressure, effectively promoting the downward penetration of the molten low-melting-point polyamide coating layer 223. At the same time, the rolling friction reduces damage and adhesion to the fabric.

[0059] The aforementioned hot-pressing equipment is based on the concept of continuous zoned processing, sequentially preheating, pressing and anchoring, and cooling and shaping the fabric to complete the final formation of the biomimetic anchoring point. Its working principle is as follows:

[0060] First, the fabric is guided into the heating chamber 6 by the guide roller 61 installed at the feed point on the left side of the hot press hood 5. The hot air body 62 blows hot air from both the top and bottom sides, so that the fabric is heated rapidly and evenly on both sides. The purpose of this process is to heat the fabric as a whole to a temperature close to but below the melting point of the low melting point polyamide, so as to make full preparation for the subsequent pressing process, ensure that the melting reaction can occur quickly and consistently, and avoid local damage to the fabric due to excessive temperature difference.

[0061] Secondly, under the action of the drive roller bodies 72 and rotating rollers 73 on both sides inside the support 71, the fabric smoothly passes through the pressing chamber 7 with a preset tension, ensuring that it is in an ideal state of flatness and tension. During this process, the electric heating worktable 74 embedded in the top side inside the support 71 provides a stable bottom heat source, so that the fabric temperature reaches above the melting point of low-melting-point polyamide. At the same time, the point pressing structure 75 located above, driven by the double-sided lifting pressure of the first lifting assembly 753 and the second lifting assembly 754, is driven by the first motor 7532, worm gear 7533, worm wheel 7534, eccentric push rod 7535 and support rod 7536. The transmission system consisting of the sliding sleeve 7537, the column 7538, and the carrier 7539 drives the entire support 751 and the pressure ball assembly 755 at its bottom to perform precise and regular up-and-down linear reciprocating motion along the four guide columns 752. At the same time, under the action of the second motor 7556, the matrix-arranged balls 75511 perform rectangular trajectory displacement motion, so that multiple balls 75511 apply rolling point pressure to the fabric surface. This dynamic point pressure can generate extremely high local pressure, effectively promoting the penetration of the molten low-melting-point polyamide coating layer 223 into the gaps between the surface and inner fibers. Meanwhile, the rolling friction reduces damage to the fabric.

[0062] Third, the pressed fabric immediately enters the cooling chamber 8 for forced cooling and shaping. The upper air-cooling guide table 82 and the lower air-cooling guide table 81 blow cold air out of the fabric from the upper and lower sides, causing its temperature to drop rapidly. This rapid cooling process can instantly solidify the molten low-melting-point polyamide and the biomimetic anchoring structure it forms, thereby permanently locking the tensile and wrinkle resistance of the product in the best state and ensuring the stability of the product performance.

[0063] Fourth, the finished fabric is guided by the first and second rollers in the cooling chamber 8 and smoothly exits the equipment from the discharge port on the right side of the hot press cover 5.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a tensile and wrinkle-resistant knitted fabric, characterized in that, Includes the following steps: S1. Provides a surface yarn, a middle layer yarn, and an inner layer yarn; the surface yarn is a blend of polyester-based shape memory fiber and conductive metal fiber; the inner layer yarn is a natural cellulose fiber or regenerated cellulose fiber yarn. S2. Using a double-sided circular knitting machine, the outer layer yarn is used to knit the outer layer loops, the inner layer yarn is used to knit the inner layer loops, and the middle layer (2) is embedded between the outer layer and the inner layer loops in a grid-like weft insertion manner to form a knitted fabric. S3. Pre-treat the knitted fabric to remove spinning and weaving oils; S4. The pretreated knitted fabric is introduced into a bipolar pulse magnetron sputtering and atomization injection combined equipment. Inorganic target material is sputtered by magnetron sputtering target material, and organic monomer solution is atomized and sprayed onto the fabric surface by organic monomer atomization injection device, forming a nano-inorganic-organic composite film in situ on the fabric surface. S5. The knitted fabric treated in step S4 is heat-set under a preset tension by a hot pressing device. The treatment temperature is higher than the melting point of the low-melting-point polyamide coating layer (223) of the intermediate layer (2) but lower than the softening point of other fibers. The heat treatment time is 3-5 minutes. The low-melting-point polyamide coating layer (223) of the intermediate layer (2) is melted. The melt forms a biomimetic anchoring point between the outer layer (1) and the inner layer (3) under capillary action, thereby obtaining the tensile and wrinkle-resistant knitted fabric. The hot pressing equipment mentioned in step S5 is a continuous zoned processing device, which includes the following components sequentially along the fabric travel direction: Heating chamber (6) is used to preheat the fabric evenly; The pressing chamber (7) is used to heat and pressurize the preheated fabric; Cooling chamber (8) is used for forced cooling and shaping of the treated fabric; The pressing chamber (7) is equipped with a point pressing structure (75) that can apply dynamic multi-point pressure to the fabric surface. The point pressure structure (75) includes a support platform (751) that can be controlled to move vertically. The top left and right sides of the support platform (751) are respectively connected to a first lifting and pressing component (753) and a second lifting and pressing component (754) of the same structure and size, and a pressure bead component (755) that is set on the support platform (751) and can realize several independently movable pressure points and move in a rectangular trajectory. The first lifting and pressing assembly (753) includes a rectangular seat (7531) that is fastened to the top of the hot press cover (5). A first motor (7532) is locked and fixed inside the lower right side of the rectangular seat (7531). A worm gear (7533) is connected to the top output shaft of the first motor (7532), and a worm wheel (7534) is meshed and driven on the left side of the worm gear (7533). An eccentric push rod (7535) is connected to the middle rotating shaft on both the front and rear sides of the worm wheel (7534). The tops of the two eccentric push rods (7535) are rotatably connected to the front and rear sides of the support rod (7536). The first motor (7532) provides driving force to convert the rotational motion of the worm wheel (7534) into the eccentric rotational motion of the eccentric push rod (7535), thereby providing the lifting and lowering drive power for the support rod (7536). The ball bearing assembly (755) includes four columns (7551) that are fastened to the four sides of the support (751) at the top. The bottom of each of the four columns (7551) is locked to the carrier plate (7552). The columns (7551) and the carrier plate (7552) form a sturdy frame for supporting and installing the internal moving parts, ensuring its structural stability during operation. A driven pulley (7553) is rotatably connected to the top middle side of the carrier plate (7552). The left side of the outer surface of the driven pulley (7553) is connected to the driving pulley (7555) via a belt (7554). The top middle side of the driving pulley (7555) is connected to the bottom output shaft of the second motor (7556). The left side of the second motor (7556) is fastened to the support (751). The second motor (7556) drives the driven pulley (7553) to rotate through the pulley transmission mechanism to transmit power to the next stage mechanism. A rectangular groove (75521) is provided on the top center side of the carrier plate (7552). A straight rod is arranged horizontally inside the driven pulley (7553), and a sliding displacement block (7557) is wrapped around one side of the outer surface of the straight rod. The bottom of the displacement block (7557) is inserted into and slides inside the rectangular groove (75521). The straight rod is equivalent to a crank, and the displacement block (7557) is equivalent to a slider, forming a crank-slider mechanism. The top of the displacement block (7557) is rotatably connected to the portal frame (7558). The frame (7558) has a sliding plate (7559) locked and fixed inside the bottom side. The top middle side of the sliding plate (7559) is laterally slidably connected to the upper sliding plate (75510). The top middle side of the upper sliding plate (75510) is slidably connected to the carrier plate (7552) front and back. The rectangular trajectory movement of the displacement block (7557) is converted into the rectangular trajectory displacement movement of the sliding plate (7559) in the XY plane. The bottom of the sliding plate (7559) has balls (75511) arranged in a rectangular shape.

2. The method for preparing a tensile and wrinkle-resistant knitted fabric according to claim 1, characterized in that: In step S4, the inorganic target is a silicon target, the sputtering atmosphere is a mixture of argon and oxygen, the organic monomer solution is a polyurethane prepolymer solution, and the composite film formed by in-situ deposition is a silicon dioxide-polyurethane composite film.

3. The method for preparing a tensile and wrinkle-resistant knitted fabric according to claim 1, characterized in that: The heating chamber (6) adopts a hot air circulation heating method, and the cooling chamber (8) adopts a cold air circulation cooling method.

4. The knitted fabric prepared by the method for preparing a tensile and wrinkle-resistant knitted fabric according to claim 1, characterized in that: The material comprises an outer layer (1) made of surface yarns, an inner layer (3) made of inner yarns, and an intermediate layer (2) embedded between the two. The intermediate layer (2) comprises a base fabric layer (21) and transverse composite yarns (22) and longitudinal composite yarns (23) that are interlaced and embedded inside the base fabric layer (21). The transverse composite yarns (22) and longitudinal composite yarns (23) are interlaced to form a mesh. The transverse composite yarns (22) and longitudinal composite yarns (23) have the same structure and size. They include two first fiber filaments (221) and a second fiber filament (222) that are woven together, and a low-melting-point polyamide coating layer (223) that completely wraps the outer surfaces of the first fiber filament (221) and the second fiber filament (222). After heat setting, the low-melting-point polyamide coating layer (223) melts to form anchoring points that anchor the outer layer (1), the middle layer (2) and the inner layer (3) together. The outer surface of the outer layer (1) is also covered with a layer of nano-silica-polyurethane composite film (4).

5. The knitted fabric according to claim 4, characterized in that: The first fiber filament (221) and the second fiber filament (222) are both high-strength, high-modulus polyethylene fiber filaments or aromatic polyamide fiber filaments.

6. The knitted fabric according to claim 4, characterized in that: The base fabric layer (21) is a thin mesh woven fabric made of meltable fibers.

7. The knitted fabric according to claim 4, characterized in that: The spacing between the transverse composite yarn (22) and the longitudinal composite yarn (23) is 3-5 mm.

8. The knitted fabric according to claim 4, characterized in that: The low-melting-point polyamide coating layer (223) has a melting point of 110-130℃, and the distribution density of the anchoring points is 50-200 per square decimeter.

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