Stretch-resistant and crease-resistant knitted fabric and preparation method thereof

Abstract

The invention relates to the technical field of knitted fabrics, and particularly discloses a stretch-resistant and crease-resistant knitted fabric and a preparation method thereof.The knitted fabric is of a three-layer composite structure, the surface layer is a crease-resistant and wear-resistant layer, the inner layer is a comfortable and skin-friendly layer, and the middle layer is a latticed reinforcing layer formed by transverse and longitudinal composite yarn in a staggered mode. The composite yarn is formed by covering a low-melting-point polyamide wrapping layer outside high-performance cellosilk. After heat setting, polyamide is fused to form a bionic anchoring point penetrating through the three layers, so that the interlayer binding force is greatly enhanced; and the surface layer is coated with a nano silicon dioxide-polyurethane composite film, so that the performance is further improved. The preparation method comprises the steps of knitting integrated forming, magnetron sputtering surface deposition and partitioned continuous hot-pressing shaping. Through structural innovation and process optimization, the single fabric comprehensively has excellent tensile resistance, wrinkle resistance, durability and comfort, layering and deformation are effectively prevented, and the production process is efficient, environmentally friendly and suitable for large-scale application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of knitted fabric, in particular to a stretch-resistant and wrinkle-resistant knitted fabric and a preparation method thereof. BACKGROUND

[0002] Knitted fabric is a fabric formed by bending yarns into loops and interlocking each other by using knitting needles, which is divided into warp-knitted fabric and weft-knitted fabric. Knitted fabric has the characteristics of softness, moisture absorption, air permeability, sweat release, warmth retention, etc., and most of them have excellent elasticity and extensibility.

[0003] At present, the Chinese patent application No. CN202321187480.8 discloses a strong-elasticity and wrinkle-resistant knitted fabric, which comprises a knitted fabric provided with an upper knitted fabric layer and a lower knitted fabric layer, the surface of the upper knitted fabric layer is interwoven with first elastic fibers, the surface of the first elastic fibers is interwoven with second elastic fibers, and the first elastic fibers and the second elastic fibers are spandex fibers.

[0004] However, the stretch-resistant and wrinkle-resistant knitted fabric of the prior art relies on spandex fibers to provide elasticity, but it does not fundamentally solve the problem of structural stretch resistance, and it is still prone to structural relaxation after long-term use. Secondly, the structure is only a simple superposition of two layers, and the layers are only connected by interweaving, so the bonding force is limited, and there is still a risk of delamination during use. Furthermore, the method cannot solve the problems of insufficient wear resistance and durability of the fabric. SUMMARY

[0005] The present application aims to provide a stretch-resistant and wrinkle-resistant knitted fabric and a preparation method to solve the problems raised in the background art.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: a stretch-resistant and wrinkle-resistant knitted fabric, which comprises an outer layer composed of surface yarns, an inner layer composed of inner layer yarns, and an intermediate layer embedded between the two; the intermediate layer comprises a base fabric layer and transverse and longitudinal composite yarns which are respectively embedded inside the base fabric layer in a staggered manner, the transverse and longitudinal composite yarns are staggered to form a grid; the structure and size of the transverse and longitudinal composite yarns are the same, which comprises two first fiber filaments and second fiber filaments which are twisted and knitted, and a low-melting-point polyamide wrapping layer which completely wraps the outer surfaces of the first fiber filaments and the second fiber filaments.

[0007] After heat setting treatment, the low-melting-point polyamide wrapping layer melts to form anchor points which anchor the outer layer, the intermediate layer and the inner layer together, and the outer surface of the outer layer is further covered with a nano-silica-polyurethane composite film.

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

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

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

[0011] Preferably, the melting point of the low-melting-point polyamide wrapping layer is 110-130℃, and the distribution density of the anchor points is 50-200 per square decimeter.

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

[0013] S1, providing surface yarns, intermediate layer yarns and inner layer yarns; the surface yarns are blended yarns of polyester-based shape memory fibers and conductive metal fibers; the inner layer yarns are natural cellulose fiber or regenerated cellulose fiber yarns;

[0014] S2, using a double-sided circular knitting machine, knitting outer layer loops with the surface yarns, knitting inner layer loops with the inner layer yarns, and embedding the intermediate layer in a grid-like manner between the outer layer and the inner layer loops to form a knitted fabric;

[0015] S3, pretreating the knitted fabric to remove spinning and knitting oil;

[0016] S4, introducing the pretreated knitted fabric into a double-pulse magnetron sputtering and atomization injection combined device, sputtering inorganic target materials through a magnetron target, and atomizing and spraying organic monomer solution to the surface of the fabric through an organic monomer atomization injection device, to form a layer of nano inorganic-organic composite film in situ on the surface of the fabric;

[0017] S5, passing the knitted fabric treated in step S4 through a heat pressing device under a preset tension for heat setting treatment, the treatment temperature being higher than the melting point of the low-melting-point polyamide wrapping layer but lower than the softening point of other fibers, and the heat treatment time being 3-5 minutes; the low-melting-point polyamide wrapping layer of the intermediate layer melts, and the melt forms biomimetic anchor points between the outer layer and the inner layer under capillary action, thereby obtaining the stretch-resistant and wrinkle-resistant knitted fabric.

[0018] Preferably, in step S4, the inorganic target material 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 in situ is a silicon dioxide-polyurethane composite film.

[0019] Preferably, the hot pressing equipment comprises a hot pressing cover seat, the inside of which is provided with partitions on both left and right sides to form a heating bin, a pressing bin and a cooling bin from left to right inside the hot pressing cover seat, a branch guide roller is arranged above the channel inside the left partition, the heating bin comprises a guide roller arranged near the feeding position on the left side of the hot pressing cover seat and a hot air main body arranged on the right side of the guide roller, the hot air main body blows hot air from both upper and lower sides, the pressing bin comprises a support fastened to the bottom of the hot pressing cover seat, the inside of the support is provided with drive roller main bodies on both left and right sides, and rotating rollers are arranged on the top of the support near the positions of the two drive roller main bodies, an electric heating workbench is embedded in the top side of the inside of the support, a point pressing structure is arranged on the top of the support, and the top of the point pressing structure is connected with the hot pressing cover seat, the cooling bin comprises an upper air-cooled guide table and a lower air-cooled guide table which are arranged in a reverse symmetry and have the same structure and size, the first branch roller is arranged near the position of the channel inside the right partition, and the second branch roller is arranged near the position of the discharging position on the right side of the hot pressing cover seat.

[0020] Preferably, the point pressing structure comprises a support, four guide columns are slidably arranged in the middle side of the inside of the support, and the top of the guide column is fixed with the hot pressing cover seat, the top of the support is connected with a first lifting and pressing assembly and a second lifting and pressing assembly which have the same structure and size and are arranged on both left and right sides, respectively, and the bottom of the support is connected with a pressing bead assembly on four sides, and the pressing bead assembly is arranged above the electric heating workbench.

[0021] Preferably, the first lifting and pressing assembly comprises a rectangular seat fastened to the top of the hot pressing cover seat, a first motor is locked and fixed on the right lower side of the inside of the rectangular seat, the top output shaft of the first motor is connected with a worm, the left side of the worm is engaged and driven by a worm wheel, eccentric push rods are connected with the shafts at the middle of the front and rear sides of the worm wheel, the top of the two eccentric push rods is rotatably connected with the front and rear sides of a supporting rod, the left side of the supporting rod is rotatably connected with the rectangular seat, the right side of the supporting rod is in the shape of a U-shaped opening, a sliding sleeve is connected inside the U-shaped opening, a vertical column is slidably arranged in the inside of the sliding sleeve, the right side of the sliding sleeve is fastened with a carrier, the top of the vertical column is fixed with the rectangular seat, and the bottom of the carrier is fastened with the support.

[0022] Preferably, the bead pressing assembly comprises four columnar rods fastened to the four sides of the top of the support platform, the bottom of each of the four columnar rods is locked and fixed to the carrier plate, a driven pulley is rotatably connected to the middle side of the top of the carrier plate, the left side of the outer surface of the driven pulley is drivingly connected with a driving pulley through a belt, the top middle side of the driving pulley is connected with the output shaft of the second motor at the bottom, and the left side of the second motor is fastened to the support platform, a rectangular groove is formed in the middle side of the top of the carrier plate, a horizontal rod is arranged inside the driven pulley, and a displacement block is slidably wrapped on one side of the outer surface of the horizontal rod, the bottom of the displacement block is inserted and slid into the inner side of the rectangular groove, and the top of the displacement block is rotatably connected with a door-shaped frame, a lower sliding plate is locked and fixed to the inner bottom of the door-shaped frame, the top middle side of the lower sliding plate is transversely slidably connected with an upper sliding plate, the top middle side of the upper sliding plate is slidably connected with the carrier plate, and the bottom of the lower sliding plate is arranged and distributed with balls in a rectangular shape.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The three-layer composite structure formed by the outer layer, the intermediate layer and the inner layer and the functional surface treatment realize the improvement of the fabric performance and the multi-functional integration, the outer layer endows the fabric with excellent wrinkle resistance and wear resistance, the inner layer ensures comfortable skin-friendly touch, and the mesh reinforced structure of the intermediate layer is the core, which provides excellent and balanced tensile resistance in all directions; and the nano composite film covered on the surface of the outer layer further enhances the durability, so that the single fabric simultaneously has the comprehensive performance which needs multiple fabrics to be stacked or complex finishing to realize in the past.

[0025] The bionic anchoring mechanism adopted by the present application significantly enhances the structural stability and durability of the fabric, through the heat setting process, the low-melting-point polyamide wrapping layer of the intermediate layer forms "chemical rivet" type anchor points after melting, which greatly improves the interlayer bonding force, effectively prevents problems such as delamination, slippage or blistering during use, and ensures that the fabric can maintain good form stability and physical properties after repeated stretching, washing and wearing through a firm integrated structure, prolonging the service life.

[0026] The preparation process of the present application is efficient, environmentally friendly and easy to realize continuous production, from knitted integrated molding to magnetron sputtering dry surface treatment, to zoned continuous heat pressing and setting, the whole process is smooth, avoiding the high energy consumption and wastewater discharge problems caused by multiple padding and baking in traditional processes; and the optimized heat pressing equipment integrates preheating, pressing and cooling into one, with high automation, not only can accurately control the key process parameters to ensure the consistency of product quality, but also greatly improves the production efficiency, suitable for large-scale industrial application. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1Structure diagram of the anti-stretch and anti-wrinkle knitted fabric of the present application;

[0028] Figure 2 Structure diagram of the intermediate layer of the present application;

[0029] Figure 3 Structure diagram of the partial top view of the connection of the base fabric layer, the transverse composite yarn and the longitudinal composite yarn of the present application;

[0030] Figure 4 Structure diagram of the transverse composite yarn of the present application;

[0031] Figure 5 Structure diagram of the hot-pressing equipment of the present application;

[0032] Figure 6 Structure diagram of the point-pressing structure of the present application;

[0033] Figure 7 Structure diagram of the first lifting-pressing assembly of the present application;

[0034] Figure 8 Structure diagram of the bead-pressing assembly of the present application;

[0035] Figure 9 Structure diagram of the top view of the bead-pressing assembly of the present application.

[0036] In the figure: outer layer-1, intermediate 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 wrapping layer-223, hot-pressing cover base-5, supporting guide roller-51, heating bin-6, pressing bin-7, cooling bin-8, guide roller-61, air-heating main body-62, support-71, driving roller main body-72, rotating roller-73, electric heating workbench-74, point-pressing structure-75, lower air-cooling guide table-81, upper air-cooling guide table-82, support table-751, guide column-752, first lifting-pressing assembly-753, second lifting-pressing assembly-754, bead-pressing assembly-755, rectangular base-7531, first motor-7532, worm-7533, worm wheel-7534, eccentric push rod-7535, supporting rod-7536, sliding sleeve-7537, vertical column-7538, carrier-7539, column rod-7551, carrier plate-7552, driven pulley-7553, belt-7554, driving pulley-7555, second motor-7556, displacement block-7557, door-shaped frame-7558, lower sliding plate-7559, upper sliding plate-75510, ball-75511, rectangular groove-75521. DETAILED DESCRIPTION

[0037] To further explain the technical solutions of the present application, specific examples are used for detailed description below.

[0038] Please refer to Figures 1-4 The present application provides a kind of anti-stretch wrinkle type knitted fabric, including by surface layer yarn The outer layer 1, by inner layer yarn The inner layer 3 and the intermediate layer 2 embedded between the two, outer layer 1 is mainly responsible for wrinkle and wear resistance, inner layer 3 guarantees comfortable skin, and the intermediate layer 2 provides anti-stretch support, thereby comprehensively improve the overall performance of fabric;

[0039] Intermediate layer 2 includes base cloth layer 21 and respectively interlaced through embedded base cloth layer 21 inside horizontal composite yarn 22 and longitudinal composite yarn 23, horizontal composite yarn 22 and longitudinal composite yarn 23 are interlaced to form grid, provide isotropic and balanced high tensile strength for fabric, effectively prevent fabric from occurring unidirectional or isotropic deformation in use;Horizontal composite yarn 22 and longitudinal composite yarn 23 are the same in structure and size, which include two first fiber filaments 221, second fiber filaments 222 and low-melting point polyamide wrapping layer 223 completely wrapped on the outer surface of first fiber filaments 221 and second fiber filaments 222, two high-performance fiber filaments are twisted and knitted to provide extremely high tensile strength, and the outer low-melting point polyamide wrapping layer 223 is prepared for forming firm interlayer anchoring point in subsequent heat setting process;

[0040] After heat setting treatment, low-melting point polyamide wrapping layer 223 melts to form anchoring point for anchoring outer layer 1, intermediate layer 2 and inner layer 3 together, the anchoring point formed by melting tightly fixes the three-layer structure like "chemical rivet", greatly improves the interlayer bonding force and anti-peeling property;Outer surface of outer layer 1 is also covered with a layer of nanosilica-polyurethane composite film 4 to further enhance the wear resistance, wrinkle resistance and durability of the fabric.

[0041] Among them, first fiber filaments 221 and second fiber filaments 222 are high-strength high-modulus polyethylene fiber filaments or aromatic polyamide fiber filaments, which are selected from ultra-high strength and high modulus fibers to ensure that the intermediate layer 2 grid can bear most of the tensile stress to ensure excellent anti-stretch performance of the fabric;Base cloth layer 21 is a thin mesh woven fabric made of fusible fibers, which can not only carry reinforcing yarns during heat setting, but also participate in melting and fusion with low-melting point polyamide wrapping layer 223 to form a more powerful and continuous mesh anchoring structure, further improving the interlayer bonding force;The spacing of horizontal composite yarn 22 and longitudinal composite yarn 23 is 3-5mm, and the melting point of low-melting point polyamide wrapping layer 223 is 110-130℃, which ensures that heat setting can be carried out without damaging other fibers, and the distribution density of anchoring point is 50-200 per square decimeter to ensure the effectiveness and uniformity of anchoring effect.

[0042] Referring to Figures 1-9 The application provides a preparation method of a stretch-resistant and wrinkle-resistant knitted fabric, and the method comprises the following steps:

[0043] S1, providing surface layer yarns, intermediate layer yarns and inner layer yarns; the surface layer yarns are blended yarns of polyester-based shape memory fibers and conductive metal fibers, the shape memory fibers endow the fabric with good wrinkle recovery ability, and the trace conductive fibers provide a substrate for the subsequent magnetron sputtering process; the inner layer yarns are natural cellulose fiber yarns or regenerated cellulose fiber yarns, and the natural or regenerated cellulose fibers ensure the comfort and moisture permeability of the skin surface of the final product;

[0044] S2, using a double-sided circular knitting machine, knitting outer layer loops with the surface layer yarns, knitting inner layer loops with the inner layer yarns, and embedding the intermediate layer 2 in a grid-like manner between the outer layer and the inner layer loops to form a knitted fabric, which is formed in one step and has a sandwich structure, and the intermediate layer is embedded in a weft insertion manner, avoiding a complex recombination process, and being efficient and stable in structure;

[0045] S3, pretreating the knitted fabric to remove spinning and knitting oil agents, so that the knitted fabric has a clean surface;

[0046] S4, introducing the pretreated knitted fabric into a double-pulse magnetron sputtering and atomization injection combined device, sputtering inorganic target materials through a magnetron target, and spraying organic monomer solution on the surface of the fabric through an organic monomer atomization injection device, to in-situ deposit a layer of nano inorganic-organic composite film on the surface of the fabric, the composite deposition technology can in-situ generate a flexible and strong nano composite film, which has strong bonding force with the fabric, can significantly improve the wear resistance, wrinkle resistance and functional properties of the fabric surface, and has low temperature, dry, environmentally friendly and small damage to the fabric during the treatment process;

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

[0048] In step S4, the inorganic target material 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 in-situ deposited composite film is a silicon dioxide-polyurethane composite film, which has high hardness, wear resistance of silicon dioxide and flexibility, high adhesion of PU, and is an ideal functional film for the surface of textiles.

[0049] The heat pressing equipment comprises a heat pressing cover seat 5, and a partition plate is arranged inside the heat pressing cover seat 5 on the left and right sides, so that a heating bin 6, a pressing bin 7 and a cooling bin 8 are formed in the heat pressing cover seat 5 from left to right, and the three processes of preheating, pressing anchoring and cooling are continuously completed in one equipment through the partition design, so that the production efficiency is greatly improved; a supporting guide roller 51 is arranged above the internal passage of the partition plate on the left side, and is used for smoothly guiding the fabric to enter the pressing bin 7 from the heating bin 6, so as to prevent the fabric from wrinkling or being stuck;

[0050] The heating bin 6 comprises a guide roller 61 arranged near the feeding position of the left side of the heat pressing cover seat 5 and a hot air main body 62 arranged on the right side of the guide roller 61, and hot air is blown out from the upper and lower sides of the hot air main body 62, so that the fabric is heated uniformly and rapidly on both sides through the hot air convection heating mode, the fabric is preheated rapidly and uniformly, and preparation is made for subsequent pressing anchoring; the pressing bin 7 comprises a support 71 fixed to the bottom of the heat pressing cover seat 5, and a driving roller main body 72 is arranged on the left and right sides in the support 71, and a rotating roller 73 is rotatably arranged on the top of the support 71 and close to the two driving roller main bodies 72, so that the fabric is pulled and conveyed through the pressing bin 7 by the driving roller main body 72 and the rotating roller 73 in a preset tension, and the fabric is ensured to be in an ideal state of being flat and tensioned when being pressed;

[0051] The support 71 is embedded with an electric heating workbench 74 on the top side, a point pressing structure 75 is arranged on the top of the support 71, and the top of the point pressing structure 75 is connected with the heat pressing cover seat 5, so as to provide a stable and uniform bottom heat source for the pressing bin 7, and cooperate with the point pressing structure 75 on the top to heat and press the fabric, so as to melt and flow the low-melting-point polyamide wrapping layer 223, the cooling bin 8 comprises an upper air-cooling guide table 82 and a lower air-cooling guide table 81 which are the same in structure and size and are arranged in an upside-down symmetrical manner, the fabric after pressing is rapidly and uniformly forced cooled on both sides, the melted low-melting-point polyamide wrapping layer 223 and the anchoring structure formed by the low-melting-point polyamide wrapping layer 223 are solidified and shaped instantaneously, the best performance is locked, a first supporting roller is arranged on the position of the internal passage of the partition plate close to the right side of the upper air-cooling guide table 82, and a second supporting roller is arranged on the position of the lower air-cooling guide table 81 close to the discharging position of the right side of the heat pressing cover seat 5, so as to support and guide the fabric to pass through the cooling area, prevent relaxation and friction, and ensure smooth cooling and discharging.

[0052] The point pressure structure 75 includes a support platform 751, four guide columns 752 sliding through the inside of the support platform 751, and the guide columns 752 are fixed to the hot press cover base 5. The guide columns 752 provide accurate vertical guidance for the support platform 751, ensuring stable and non-deviated lifting movement, thereby ensuring uniformity and consistency of pressure application. The support platform 751 is connected to the first and second pressure lifting assemblies 753 and 754 on the left and right sides of the top, respectively, and the support platform 751 is connected to the pressure bead assemblies 755 on the four sides of the bottom. The pressure bead assemblies 755 are located above the electric heating table 74 and are powered by the double-sided pressure lifting assemblies to drive the entire point pressure structure 75 to move regularly. The pressure bead assemblies 755 at the bottom are directly responsible for the "point pressure" function, and the balls on them will roll on the surface of the fabric.

[0053] The first pressure lifting assembly 753 includes a rectangular seat 7531 fixed to the top of the hot press cover base 5, a first motor 7532 fixed to the lower right side of the inside of the rectangular seat 7531, a worm 7533 connected to the top output shaft of the first motor 7532, a worm gear 7534 meshing and driving the left side of the worm 7533, and two eccentric push rods 7535 connected to the front and rear sides of the support rod 7536 at the top, respectively. The first motor 7532 provides driving force to convert the rotational movement of the worm gear 7534 into eccentric rotary movement of the eccentric push rods 7535, and further provides lifting driving power for the support rod 7536.

[0054] The support rod 7536 is rotatably connected to the left side of the rectangular seat 7531, and the right side of the support rod 7536 is in the shape of a U-shaped opening with a sliding sleeve 7537 connected inside. A vertical column 7538 slides longitudinally through the inside of the sliding sleeve 7537, and the sliding sleeve 7537 is fixed to the right side of the carrier 7539. The vertical column 7538 is fixed to the top of the rectangular seat 7531, and the carrier 7539 is fixed to the bottom of the support platform 751. The rotary movement of the eccentric push rods 7535 is finally converted into accurate linear reciprocating movement of the support platform 751. The sliding fit of the sliding sleeve 7537 and the vertical column 7538 ensures the linearity and stability of the movement, thereby driving the pressure bead assemblies 755 to accurately point pressure the fabric.

[0055] The bead pressing assembly 755 comprises four columnar rods 7551 fastened to the four sides of the top of the support table 751, and the bottom of each of the columnar rods 7551 is locked and fixed to the carrier plate 7552. The columnar rods 7551 and the carrier plate 7552 form a firm frame for supporting and mounting the internal moving parts, ensuring the structural stability during the operation. The top middle side of the carrier plate 7552 is rotationally connected with a driven pulley 7553. The left side of the outer surface of the driven pulley 7553 is in transmission connection with a driving pulley 7555 through a belt 7554. The top middle side of the driving pulley 7555 is connected with the bottom output shaft of a second motor 7556, and the left side of the second motor 7556 is fastened to the support table 751. The second motor 7556 drives the driven pulley 7553 to rotate through the belt pulley transmission mechanism, so as to transmit power to the next stage mechanism.

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

[0057] The top of the displacement block 7557 is rotationally connected with a door-shaped frame 7558. The interior of the bottom of the door-shaped frame 7558 is locked and fixed with a lower sliding plate 7559. The top middle side of the lower sliding plate 7559 is in transversely sliding connection with an upper sliding plate 75510. The top middle side of the upper sliding plate 75510 is in front-rear sliding connection with the carrier plate 7552. The rectangular trajectory motion of the displacement block 7557 is converted into the displacement motion of the lower sliding plate 7559 in the XY plane with a rectangular trajectory, so that the final pressing point action is not a simple vertical impact, but with a certain transverse rubbing, which is more conducive to the penetration and distribution of the molten polymer.

[0058] The bottom of the lower sliding plate 7559 is arranged with a plurality of balls 75511 in a rectangular shape. The plurality of balls 75511 serve as the final execution element, and the matrix arrangement ensures the uniformity and comprehensiveness of the pressing. The balls roll on the surface of the heated fabric for point contact type pressing, which can generate extremely high local pressure, effectively promoting the downward penetration of the molten low-melting-point polyamide wrapping layer 223, and the rolling friction reduces the damage and adhesion to the fabric.

[0059] The above hot pressing equipment is based on the concept of continuous partition processing, and sequentially preheats, presses, anchors and cools the fabric to complete the final formation of the bionic anchor point. The working principle is as follows:

[0060] Firstly, the fabric is guided into the heating bin 6 by the guide roller 61 installed at the left side of the hot press cover base 5, and the hot air main body 62 blows hot air from the top and bottom to rapidly and uniformly heat the fabric on both sides. The purpose of this process is to heat the entire fabric to a temperature close to but lower than the melting point of low-melting polyamide, fully preparing for the subsequent pressing process, ensuring that the melting reaction occurs quickly and consistently, while avoiding local damage to the fabric due to large temperature differences;

[0061] Secondly, the fabric is smoothly guided through the pressing bin 7 by the driving roller main body 72 and the rotating roller 73 on the left and right sides of the support 71, ensuring that it is in an ideal state of flat tension. In this process, the electric heating workbench 74 embedded in the top side of the support 71 provides a stable bottom heat source, allowing the fabric temperature to exceed the melting point of low-melting polyamide. At the same time, the point pressure structure 75 located above is driven by the first lifting pressure assembly 753 and the second lifting pressure assembly 754, which is driven by the transmission system composed of the first motor 7532, the worm 7533, the worm gear 7534, the eccentric push rod 7535, and the support rod 7536, the sliding sleeve 7537, the column 7538, and the carrier 7539. The entire support 751 and the pressure bead assembly 755 at the bottom of the support 751 perform precise and regular linear reciprocating motion along the four guide columns 752. At the same time, the matrix arranged rolling balls 75511 are moved in a rectangular trajectory under the action of the second motor 7556, so that multiple rolling balls 75511 roll on the surface of the fabric to implement point pressure. This dynamic point pressure can generate extremely high local pressure, effectively promoting the penetration of the melted low-melting polyamide wrapping layer 223 into the gap between the surface and the inner layer fibers, while the rolling friction reduces the damage to the fabric;

[0062] Thirdly, the fabric that has completed the pressing immediately enters the cooling bin 8 for forced cooling and shaping. The upper air cooling guide table 82 and the lower air cooling guide table 81 blow cold air from the top and bottom to the fabric, causing its temperature to drop rapidly. This rapid cooling process can instantly solidify the melted low-melting polyamide and the biomimetic anchoring structure formed by it, thereby permanently locking the product's stretch resistance and wrinkle resistance at the optimal state, ensuring the stability of the product's performance.

[0063] Fourthly, the fabric that has completed the final processing is guided by the first and second supporting rollers in the cooling bin 8 and smoothly output from the right side of the hot press cover base 5.

[0064] The above merely describes the preferred examples of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications can be made to the foregoing embodiments, or some of the technical features thereof can be equivalently replaced, without departing from the spirit and principle of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stretch-resistant and wrinkle-resistant knitted fabric, characterized by: The invention comprises an outer layer (1) composed of surface yarns, an inner layer (3) composed of inner yarns, and an intermediate layer (2) embedded therebetween; the intermediate layer (2) comprises a base fabric layer (21) and transverse composite yarns (22) and longitudinal composite yarns (23) respectively interlaced and penetrating the interior of the embedded base fabric layer (21); the transverse composite yarns (22) and longitudinal composite yarns (23) are interlaced and distributed to form a grid; the transverse composite yarns (22) and longitudinal composite yarns (23) have the same structure and size, and comprise two first fiber filaments (221) and a second fiber filament (222) formed by twisting and braiding, and a low-melting-point polyamide wrapping layer (223) completely wrapping the outer surfaces of the first fiber filament (221) and the second fiber filament (222); After heat setting, the low-melting-point polyamide wrapping layer (223) melts to form anchor 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-silicon dioxide-polyurethane composite film (4).

2. The stretch-resistant and wrinkle-resistant knitted fabric according to claim 1, characterized in that: The first fiber filaments (221) and the second fiber filaments (222) are both high-strength and high-modulus polyethylene fiber filaments or aromatic polyamide fiber filaments.

3. The stretch-resistant and wrinkle-resistant knitted fabric according to claim 1, characterized in that: The base fabric layer (21) is a thin mesh woven fabric made of meltable fibers.

4. The stretch-resistant and wrinkle-resistant knitted fabric according to claim 1, characterized in that: The spacing between the transverse composite yarn (22) and the longitudinal composite yarn (23) is 3-5 mm.

5. The stretch-resistant and wrinkle-resistant knitted fabric according to claim 1, characterized in that: The melting point of the low-melting-point polyamide wrapping layer (223) is 110-130° C., and the distribution density of the anchor points is 50-200 per square decimeter.

6. A method for preparing a stretch-resistant and wrinkle-resistant knitted fabric, for preparing the stretch-resistant and wrinkle-resistant knitted fabric according to any one of claims 1 to 5, characterized in that: The steps include: S1. Providing a surface yarn, a middle yarn, and an inner yarn; the surface yarn is a blended yarn of polyester-based shape memory fiber and conductive metal fiber; the inner yarn is a natural cellulose fiber or a regenerated cellulose fiber yarn; S2, using a double-sided circular knitting machine, using the surface yarn to weave the outer layer coils, using the inner layer yarn to weave the inner layer coils, and embedding the middle layer (2) between the outer layer and the inner layer coils in a grid-like weft insertion manner to form a knitted fabric; S3, pre-treating the knitted fabric to remove spinning and weaving oils; S4, introducing the pretreated knitted fabric into a bipolar pulsed magnetron sputtering and atomization injection combined device, sputtering the inorganic target material through the magnetron target material, and atomizing and spraying the organic monomer solution onto the fabric surface through the organic monomer atomization injection device, thereby in-situ depositing a layer of nano-inorganic-organic composite film on the fabric surface; S5. The knitted fabric processed in step S4 is subjected to heat setting treatment by a hot pressing device under a preset tension, wherein the treatment temperature is higher than the melting point of the low-melting-point polyamide wrapping layer (223) but lower than the softening point of other fibers, and the heat treatment time is 3-5 minutes; the low-melting-point polyamide wrapping layer (223) of the middle layer (2) is melted, and the melt forms a bionic anchor point between the outer layer (1) and the inner layer (3) under the capillary action, thereby obtaining the stretch-resistant and wrinkle-resistant knitted fabric.

7. The method for preparing a stretch-resistant and wrinkle-resistant knitted fabric according to claim 6, characterized in that: In step S4, the inorganic target material 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.

8. The method for preparing a stretch-resistant and wrinkle-resistant knitted fabric according to claim 6, characterized in that: The hot pressing equipment described in step S5 is a continuous partition processing device, which includes the following steps in the fabric travel direction: A heating chamber (6) for uniformly preheating the fabric; A pressing chamber (7) for heating and pressurizing the preheated fabric; A cooling chamber (8) is used to force cooling and shaping of the treated fabric; The pressing chamber (7) is provided with a point pressing structure (75) capable of applying dynamic multi-point pressure to the surface of the fabric.

9. The method for preparing a stretch-resistant and wrinkle-resistant knitted fabric according to claim 8, characterized in that: The point pressing structure (75) comprises a support platform (751) capable of controlled vertical movement, and a pressing ball assembly (755) arranged on the support platform (751) capable of realizing a plurality of independently movable pressing points and performing rectangular trajectory movement.

10. The method for preparing a stretch-resistant and wrinkle-resistant knitted fabric according to claim 8, 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.

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