Heat-shielding pull frame cloth and preparation process thereof

Abstract

The invention belongs to the technical field of functional textile fabrics, and particularly relates to heat-shielding pull rack cloth and a preparation process thereof.The heat-shielding pull rack cloth comprises an elastic supporting substrate layer, the upper surface of the elastic supporting substrate layer is fixedly connected with a hollow heat-shielding functional layer, and the upper surface of the hollow heat-shielding functional layer is fixedly connected with a skin-friendly contact layer; the skin-friendly contact layer, the hollow heat insulation functional layer and the elastic supporting substrate layer are prepared from the following three kinds of fibers in percentage by weight: 64 to 68 percent of 50S combed cotton fibers, 27 to 30 percent of 40D hollow polyester fibers and 4.5 to 6.5 percent of 20D spandex fibers. According to the heat-shielding pull frame cloth and the preparation process, the elastic supporting base layer, the hollow heat-shielding functional layer and the skin-friendly contact layer are arranged, and when the heat-shielding pull frame cloth is used, through triple function coupling of hollow combed cotton and fine denier spandex, the problem that traditional heat-shielding fabric is hard, stuffy and inelastic is solved.

Description

Technical Field

[0001] This invention relates to the field of functional textile fabric technology, and in particular to a heat-shielding stretch fabric and its preparation process. Background Technology

[0002] In high-temperature or strong sunlight environments, human comfort depends not only on the breathability of the fabric but also on its ability to insulate against external heat (including radiant and conductive heat), i.e., its "heat-shielding" or "heat-insulating" performance. Traditional solutions mainly fall into two categories: one is to coat the fabric with a metallic reflective layer or add functional additives such as ceramic micropowder during the finishing stage, but this method often sacrifices the fabric's softness and breathability and has poor durability; the other is to use chemical fibers with hollow cross-sections, utilizing the stagnant air (with extremely low thermal conductivity) trapped in the hollow parts to block heat conduction.

[0003] However, existing fabrics that simply use hollow fibers often face the following challenges: 1. Hollow fibers (such as ordinary hollow polyester) have a stiff feel and poor moisture absorption, which affects the comfort of wearing the fabric.

[0004] 2. When natural fibers such as cotton are blended in to improve comfort, how to balance the heat-shielding properties of polyester with the dyeing and finishing process of cotton (high temperature can easily damage the hollow structure) becomes a problem.

[0005] 3. While introducing spandex to provide elasticity, how to ensure that the fabric can maintain a stable heat-blocking structure and shape retention after multiple stretchings?

[0006] Therefore, a heat-shielding stretch fabric and its preparation process are needed. Summary of the Invention

[0007] Based on existing technical problems, this invention proposes a heat-shielding stretch fabric and its preparation process.

[0008] The present invention proposes a heat-shielding stretch fabric, comprising an elastic support base layer, a hollow heat-shielding functional layer fixedly connected to the upper surface of the elastic support base layer, and a skin-friendly contact layer fixedly connected to the upper surface of the hollow heat-shielding functional layer.

[0009] The skin-friendly contact layer, the hollow heat-shielding functional layer, and the elastic support base layer are composed of the following three types of fibers by weight percentage: 64% to 68% of 50S combed cotton fiber, 27% to 30% of 40D hollow polyester fiber, and 4.5% to 6.5% of 20D spandex fiber.

[0010] Preferably, the elastic support base layer is made of spandex fiber, preferably 20D fine denier spandex fiber, and the hollow heat-shielding functional layer is made of yarn rich in hollow polyester fiber, preferably bio-based. The skin-friendly contact layer is made of yarn rich in combed cotton fibers, preferably 50S or higher combed cotton fibers.

[0011] Preferably, the spandex fibers are used to form the elastic support base layer by weft insertion or yarn filling, and the elastic support base layer accounts for 4.5% to 6.5%, preferably 5.5%.

[0012] Preferably, the hollow polyester fiber has a hollow cross section for forming a hollow heat-shielding functional layer in the fabric for static air insulation, and the hollow heat-shielding functional layer accounts for 27% to 30%, preferably 28.5%.

[0013] Preferably, the skin-friendly contact layer is used to provide a soft, smooth, and low-irritation feel to the direct skin contact layer, and the skin-friendly contact layer accounts for 64% to 68%, preferably 66%.

[0014] Preferably, the combed cotton fibers and the hollow polyester fibers are blended together to form the main yarn of the fabric.

[0015] Preferably, the spandex fiber is woven in as bare yarn or core-spun yarn through weft knitting or weft-insertion processes to form a continuous and uniform elastic network base inside the fabric.

[0016] Preferably, a process for preparing a heat-shielding stretch fabric includes the following steps:

[0017] Step 1: Weaving, weaving combed cotton / hollow fiber The blended yarn and 20D spandex yarn are woven into a greige fabric on a double-sided circular knitting machine or a high-speed warp knitting machine. The spandex is fed in a pre-stretched state, and the stretch ratio is controlled between 2.8 and 3.5 by a tension adjustment mechanism to ensure uniform and moderate elasticity.

[0018] Step 2: Scouring. The fabric is gently scourted to remove spinning oils and weaving waxes. The temperature is strictly controlled at 90-98℃, and the time is 25-40 minutes.

[0019] Step 3: Dyeing. A two-bath dyeing process is used to balance dyeing effect and fiber protection.

[0020] The first bath involves using disperse dyes at a low temperature of 110-115℃ for hollow fiber optic cables. For fiber dyeing, keep warm for 30-50 minutes. For the second bath, after washing the fabric, adjust the dye bath to alkaline and use reactive dyes to dye the combed cotton fibers at a low temperature of 60-65℃.

[0021] Step 4: Finishing, including softening and heat setting;

[0022] The fabric is treated with a hydrophilic silicone softener after dyeing to enhance its ultimate smoothness, skin-friendly feel, and moisture-wicking properties.

[0023] Heat setting, performed on a tenter frame, relies on ultra-low setting temperature and precise tension control.

[0024] Preferably, in step one, multiple tension adjustment mechanisms are arranged between the yarn unwinding bracket and the double-sided circular knitting machine or high-speed warp knitting machine, and the tension adjustment mechanisms are connected to the PLC control system of the double-sided circular knitting machine or high-speed warp knitting machine via cables;

[0025] The tension adjustment mechanism includes a fixed bracket, on the surface of which a geared drive motor is fixedly mounted. The geared drive motor is electrically connected to the PLC controller in the double-sided circular knitting machine or the high-speed warp knitting machine via a cable, thereby facilitating automatic control of the geared drive motor by the PLC controller of the double-sided circular knitting machine or the high-speed warp knitting machine.

[0026] A tension bracket is fixedly connected to the inner wall of the fixed bracket. The surface of the tension bracket is cross-shaped. An adjusting shaft is rotatably connected to the surface of the tension bracket via a bearing. One end of the adjusting shaft is fixedly connected to the reduction output end of the reduction drive motor. The surface of the adjusting shaft is rotatably connected to the surface of the fixed bracket via a bearing.

[0027] A tension adjusting cam disk is fixedly sleeved on the surface of the adjusting shaft, and a positioning retainer is slidably sleeved on the surface of the tension adjusting cam disk. The surface of the positioning retainer is fixedly connected to the surface of the tension support.

[0028] Preferably, an oil reservoir is fixedly connected to the surface of the positioning retainer, and four oil reservoirs are arranged in a circular array with the axis of the adjusting shaft as the center. The surface of the oil reservoir is fixedly connected to the surface of the tension support.

[0029] A pressure regulating piston is slidably connected to the inner wall of the oil reservoir. A pressure regulating rod is fixedly connected to the surface of the pressure regulating piston near the positioning retainer. One end of the pressure regulating rod passes through and extends to the inner wall of the positioning retainer. A contact wheel is rotatably connected to one end of the pressure regulating rod via a wheel axle. The surface of the contact wheel is slidably connected to the surface of the tension adjusting cam disc.

[0030] A pressure-bearing piston is slidably connected to the inner wall of the oil storage pipe. A pressure-bearing rod is fixedly connected to the surface of the pressure-bearing piston. A sealing ring is slidably connected to the surface of the pressure-bearing rod. The surface of the sealing ring is fixedly connected to the inner wall of the oil storage pipe.

[0031] A pressure spring is sleeved on the surface of the pressure rod, and the two ends of the pressure spring are fixedly connected to the surface of the sealing ring and the surface of the pressure piston, respectively.

[0032] Hydraulic oil is provided inside the oil storage pipe between the pressure-bearing piston and the pressure-regulating piston.

[0033] One end of the pressure-bearing rod is fixedly connected to a guide wheel seat. The surface of the guide wheel seat is L-shaped, and a yarn guide wheel is rotatably connected to the inner wall of the guide wheel seat. The two yarn guide wheels are distributed at a 90-degree angle on the inner wall of the guide wheel seat.

[0034] The beneficial effects of this invention are as follows:

[0035] 1. By setting an elastic support base layer, a hollow heat-shielding functional layer, and a skin-friendly contact layer, during use, the hollow... The triple functional coupling of combed cotton and fine denier spandex solves the pain points of traditional heat-blocking fabrics: "stiff, stuffy, and lacking elasticity".

[0036] 2. By setting up a tension adjustment mechanism, when tension fluctuations are detected by the tension roller or tension sensor during the fabric weaving process, feedback is sent to the PLC controller. The PLC controller controls the reduction drive motor to work, which drives the tension adjustment cam to rotate and finely adjust the yarn tension. This improves the uniformity and yield of the fabric, reduces problems such as "stripes" and inconsistent width caused by uneven tension from the source, and lays a good foundation for subsequent processing. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a heat-shielding stretch fabric proposed in this invention;

[0038] Figure 2 This is a three-dimensional view of the fixed support structure for the preparation process of a heat-shielding stretch fabric proposed in this invention;

[0039] Figure 3 This is a three-dimensional view of the positioning retainer structure for the preparation process of a heat-shielding stretch fabric proposed in this invention;

[0040] Figure 4 This is a front view of the tension adjustment cam disk structure in the preparation process of a heat-shielding stretch fabric proposed in this invention;

[0041] Figure 5 This is a three-dimensional view of the pressure spring structure in the preparation process of a heat-shielding stretch fabric proposed in this invention.

[0042] Figure 6 This is a three-dimensional view of the guide wheel seat structure for the preparation process of a heat-shielding stretch fabric proposed in this invention.

[0043] In the diagram: 1. Elastic support base layer; 2. Hollow heat-shielding functional layer; 3. Skin-friendly contact layer; 4. Fixing bracket; 401. Gear drive motor; 402. Tension bracket; 403. Adjusting shaft; 404. Tension adjusting cam plate; 405. Positioning retainer; 406. Oil reservoir; 407. Pressure adjusting piston; 408. Pressure adjusting rod; 409. Contact wheel; 410. Pressure-bearing piston; 411. Pressure-bearing rod; 412. Sealing ring; 413. Pressure spring; 414. Guide wheel seat; 415. Yarn guide wheel. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0045] Example 1

[0046] Reference Figure 1 A heat-shielding stretch fabric includes an elastic support base layer 1, a hollow heat-shielding functional layer 2 fixedly connected to the upper surface of the elastic support base layer 1, and a skin-friendly contact layer 3 fixedly connected to the upper surface of the hollow heat-shielding functional layer 2.

[0047] The skin-friendly contact layer 3, the hollow heat-shielding functional layer 2, and the elastic support base layer 1 are composed of the following three types of fibers by weight percentage: 64% to 68% of 50S combed cotton fiber, 27% to 30% of 40D hollow polyester fiber, and 4.5% to 6.5% of 20D spandex fiber.

[0048] The elastic support base layer 1 is made of spandex fiber, the hollow heat-shielding functional layer 2 is made of yarn rich in hollow polyester fiber, and the skin-friendly contact layer 3 is made of yarn rich in combed cotton fiber.

[0049] Specifically, spandex fibers are used as weft inserts or additional yarns to form an elastic support base layer 1, which accounts for 4.5% to 6.5%, preferably 5.5%. 20D fine denier spandex fibers are used. Its function is to provide the fabric with moderate four-way elasticity (warp and weft elongation up to 120%-150%) with minimal addition, ensuring a close and unrestricted fit during activity and restoring its original shape when at rest, thus maintaining the garment's silhouette.

[0050] Hollow polyester fibers have a hollow cross-section and are used to form a hollow heat-shielding functional layer 2 for static air insulation in the fabric. The hollow heat-shielding functional layer 2 accounts for 27% to 30%, preferably 28.5%. 40D single-pore or multi-pore hollow polyester fibers are used, and bio-based fibers are particularly preferred. (Polypropylene terephthalate, PTT) fiber. This component performs the core function:

[0051] Passive heat shielding: The hollow structure inside the fiber (preferably 20% to 35% hollowness) traps a large amount of still air, forming a highly efficient micro-insulation unit that significantly blocks heat conduction and convection.

[0052] Fluffy and lightweight: The hollow structure gives the fabric greater fluffiness and a lighter feel, trapping more static air and enhancing the overall insulation effect.

[0053] Memory rebound: The inherent excellent resilience of the fiber, combined with the synergistic effect of spandex, ensures that the fabric can quickly and smoothly return to its original shape after repeated stretching.

[0054] Green and environmentally friendly: Bio-based raw materials reduce the carbon footprint of products, which is in line with the trend of sustainable development.

[0055] The skin-friendly contact layer 3 provides a soft, smooth, and low-irritation feel to the skin, and maintains a dry skin microenvironment through its natural moisture-wicking properties. The purity and fineness of the yarn are ensured through combing and a high yarn count. The skin-friendly contact layer 3 comprises 64%–68%, preferably 66%. It uses combed cotton fibers of 50S and above.

[0056] Furthermore, combed cotton fibers and hollow polyester fibers are blended together to form the main yarn of the fabric.

[0057] Furthermore, spandex fibers are woven into the fabric in the form of bare yarn or core-spun yarn through weft knitting or weft-insertion processes to form a continuous and uniform elastic network base inside the fabric.

[0058] Ideally, during use, the front side of the fabric (skin side) is rich in cotton fibers due to its weave design, forming a skin-friendly layer; the main body of the fabric (middle layer) is hollow. The fibers are concentrated to form a continuous heat-shielding layer; the spandex network that runs through the fabric forms an elastic support layer. The three-layer structure is formed in one step during the knitting process, working synergistically to ensure the fabric's performance remains stable during dynamic use.

[0059] By setting an elastic support base layer 1, a hollow heat-shielding functional layer 2, and a skin-friendly contact layer 3, during use, the hollow... The triple functional coupling of combed cotton and fine denier spandex solves the pain points of traditional heat-blocking fabrics being "stiff, stuffy, and lacking elasticity." Tests show that under simulated sunlight irradiation, the inner surface temperature rise of the fabric of this invention is significantly delayed, with the peak temperature being 3-5°C lower than that of similar ordinary fabrics, while maintaining high elasticity and high recovery rate, achieving a breakthrough combination of performance.

[0060] Example 2

[0061] A process for preparing a heat-shielding stretch fabric includes the following steps:

[0062] Step 1: Weaving, weaving combed cotton / hollow fiber The blended yarn and 20D spandex filament are woven into greige fabric on a double-sided circular knitting machine or a high-speed warp knitting machine. The spandex is fed in a pre-stretched state, and the stretch ratio is controlled between 2.8 and 3.5 by a tension adjustment mechanism to ensure uniform and moderate elasticity. A cotton-covered polyester or weft-inserted weave structure is used to concentrate the cotton feel on the front side of the fabric.

[0063] like Figures 2-6 As shown, in step one, multiple tension adjustment mechanisms are set between the yarn unwinding bracket and the double-sided circular knitting machine or high-speed warp knitting machine. The tension adjustment mechanisms are connected to the PLC control system of the double-sided circular knitting machine or high-speed warp knitting machine via cables. In use, the tension adjustment mechanisms are automatically controlled by the existing control system of the double-sided circular knitting machine or high-speed warp knitting machine, and are linked with the existing yarn feeding system of the double-sided circular knitting machine or high-speed warp knitting machine.

[0064] The tension adjustment mechanism includes a fixed bracket 4, on the surface of which a geared drive motor 401 is fixedly mounted. The geared drive motor 401 is electrically connected to the PLC controller in the double-sided circular knitting machine or high-speed warp knitting machine via a cable, thereby facilitating automatic control of the geared drive motor 401 by the PLC controller of the double-sided circular knitting machine or high-speed warp knitting machine.

[0065] Furthermore, in this embodiment, the reduction drive motor 401 adopts a worm gear reduction motor. When in use, after the reduction motor stops, the lead angle of the worm is less than the equivalent friction angle between the tooth surfaces, and the mechanism enters a self-locking state. At this time, only the worm can drive the worm wheel, and the worm wheel cannot drive the worm in the reverse direction. The output shaft can reliably maintain its position, preventing the load from moving unexpectedly due to gravity or inertia. Thus, the output shaft self-locking feature is achieved after the reduction drive motor 401 stops.

[0066] A tension bracket 402 is fixedly connected to the inner wall of the fixed bracket 4. The surface of the tension bracket 402 is cross-shaped. An adjusting shaft 403 is rotatably connected to the surface of the tension bracket 402 through a bearing. One end of the adjusting shaft 403 is fixedly connected to the reduction output end of the reduction drive motor 401. The surface of the adjusting shaft 403 is rotatably connected to the surface of the fixed bracket 4 through a bearing.

[0067] In use, the adjustment shaft 403 is rotated by the speed reduction drive motor 401.

[0068] A tension adjusting cam disk 404 is fixedly sleeved on the surface of the adjusting shaft 403, and a positioning retainer 405 is slidably sleeved on the surface of the tension adjusting cam disk 404. The surface of the positioning retainer 405 is fixedly connected to the surface of the tension support 402.

[0069] Furthermore, the shape of the tension adjusting cam disk 404 is as follows: Figure 4 As shown, the tension adjusting cam disk 404 is driven to rotate by the reduction drive motor 401 to achieve different tension and pressure adjustments.

[0070] The surface of the positioning retainer 405 is fixedly connected to an oil reservoir 406. The four oil reservoirs 406 are arranged in a ring array with the axis of the adjusting shaft 403 as the center. The surface of the oil reservoir 406 is fixedly connected to the surface of the tension bracket 402.

[0071] A pressure regulating piston 407 is slidably connected to the inner wall of the oil reservoir 406. A pressure regulating rod 408 is fixedly connected to the surface of the pressure regulating piston 407 near the positioning retainer 405. One end of the pressure regulating rod 408 passes through and extends to the inner wall of the positioning retainer 405. One end of the pressure regulating rod 408 is rotatably connected to a contact wheel 409 via a wheel axle. The surface of the contact wheel 409 is slidably connected to the surface of the tension adjusting cam disk 404.

[0072] During use, the contact wheel 409 contacts the surface of the tension regulating cam disk 404, which reduces the frictional force between the contact wheel and the tension regulating cam disk 404 during the pressure regulation process. This facilitates the adjustment of the position of the pressure regulating piston 407 inside the oil reservoir 406, thereby achieving a better effect of pressure regulation inside the oil reservoir 406.

[0073] A pressure-bearing piston 410 is slidably connected to the inner wall of the oil reservoir 406. A pressure-bearing rod 411 is fixedly connected to the surface of the pressure-bearing piston 410. A sealing ring 412 is slidably connected to the surface of the pressure-bearing rod 411. The surface of the sealing ring 412 is fixedly connected to the inner wall of the oil reservoir 406.

[0074] During use, the sealing ring 412 seals the oil reservoir 406 and guides and limits the telescopic movement of the pressure rod 411.

[0075] A pressure spring 413 is sleeved on the surface of the pressure rod 411, and the two ends of the pressure spring 413 are fixedly connected to the surface of the sealing ring 412 and the surface of the pressure piston 410, respectively.

[0076] Hydraulic oil is provided inside the oil reservoir 406 between the pressure-bearing piston 410 and the pressure-regulating piston 407.

[0077] One end of the pressure rod 411 is fixedly connected to a guide wheel seat 414. The surface of the guide wheel seat 414 is L-shaped. A yarn guide wheel 415 is rotatably connected to the inner wall of the guide wheel seat 414. The two yarn guide wheels 415 are distributed at a 90-degree angle on the inner wall of the guide wheel seat 414.

[0078] In use, the yarn is unwound from the yarn unwinding bracket and enters the tension adjusting mechanism, where it contacts the yarn guide roller 415 and is tightened. It then enters a double-sided circular knitting machine or a high-speed warp knitting machine. The tension of the yarn is detected by the tension roller or tension sensor in the machine, which controls the reduction drive motor 401. The reduction output of the motor 401 drives the adjusting shaft 403 to rotate, which in turn drives the tension adjusting cam disc 404 to rotate. This compresses and pushes the contact wheel 409 and the pressure adjusting rod 408 into the oil reservoir 406, pushing the pressure adjusting piston 407 to compress... Hydraulic oil is pressurized, which pushes the pressure piston 410 and pressure rod 411 to move, thereby driving the guide wheel seat 414 and yarn guide wheel 415 to move and apply tension to the yarn. During the fabric weaving process, when the tension roller or tension sensor detects a fluctuation in the tension value, it feeds back to the PLC controller. The PLC controller controls the reduction drive motor 401 to work, driving the tension adjusting cam disk 404 to rotate and finely adjust the yarn tension. This improves the uniformity and yield of the fabric, reduces problems such as "stripes" and inconsistent width caused by uneven tension from the source, and lays a good foundation for subsequent processing.

[0079] Hydraulic oil, acting as a flexible force transmission medium, works in conjunction with pressure spring 413 to form the core buffer unit of the system. Sudden tension impacts on the yarn are first received by yarn guide roller 415 and pressure piston 410; some energy is absorbed by the viscous resistance of the hydraulic oil, and some is stored by compressing pressure spring 413. This effectively filters high-frequency vibrations and tension spikes during high-speed loom operation, preventing the impact force from being directly transmitted to the combed / hollow fiber. The blended yarn specifically protects the microstructure of the hollow fibers from mechanical tensile damage, ensuring the fabric's heat-shielding function from the weaving stage. Simultaneously, in the face of small, slow tension fluctuations, the pressure piston 410 can quickly and adaptively compensate using the fluidity of the hydraulic oil and the elasticity of the spring, eliminating the need for frequent motor start-stop cycles, thus improving response speed and reducing energy consumption. Meanwhile, the sealing ring 412 ensures the system's sealing performance, while the inherent self-locking characteristic of the worm gear reducer motor prevents reverse rotation, reliably maintaining the adjusted tension position. The overall mechanism operates smoothly, with low noise and minimal wear.

[0080] Step 2: Scouring. The fabric is gently scourted to remove spinning oils and weaving waxes. The temperature is strictly controlled at 90-98℃ for 25-40 minutes. Strong alkalis and prolonged boiling should be avoided to protect the hollow fiber morphology and bio-based polymer chain structure.

[0081] Step 3: Dyeing. A two-bath dyeing process is used to balance dyeing effect and fiber protection.

[0082] Specifically, in the first bath, disperse dyes are used at a low temperature of 110-115℃ for hollow fiber optic cables. For fiber dyeing, maintain the temperature for 30-50 minutes. This temperature range is a well-proven equilibrium point that ensures both dyeing depth and fastness while preventing the hollow structure from collapsing or melting, which is crucial for preserving the heat-shielding function.

[0083] In the second bath, after washing the fabric, the dye bath is adjusted to alkaline (pH 10.5-11.5), and reactive dyes are used to dye the combed cotton fibers at a low temperature of 60-65℃. Low-temperature dyeing effectively prevents damage to the already dyed fibers. The fibers cause color shift or heat damage, while protecting the elasticity of the spandex.

[0084] Step four, finishing, including softening and heat setting.

[0085] Specifically, the softening treatment involves impregnating the dyed fabric with a hydrophilic silicone softener to enhance its ultimate smoothness, skin-friendliness, and moisture-wicking properties.

[0086] Heat setting, performed on a tenter frame, relies on ultra-low setting temperature and precise tension control. The setting temperature is strictly controlled at 150-160℃. The scientific basis of this temperature is that: a) it is sufficient to... a) The fiber and cotton fiber undergo heat setting, stabilizing the fabric structure; b) it is entirely within the effective setting temperature window of spandex, stabilizing its elasticity and preventing excessive fabric shrinkage; c) it is far below the critical temperature that destroys the hollow structure, ensuring long-lasting heat-shielding function. Tension and overfeed control employ low / micro-tension combined with 5%-10% overfeed for setting. This requires equipment with high-precision transmission and online tension monitoring. Low tension prevents hollow fibers from being stretched and deformed, while high overfeed gives the fabric a fluffy feel and better elastic recovery space.

[0087] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heat-shielding stretch fabric, comprising an elastic support base layer (1), characterized in that: The upper surface of the elastic support base layer (1) is fixedly connected to a hollow heat-shielding functional layer (2), and the upper surface of the hollow heat-shielding functional layer (2) is fixedly connected to a skin-friendly contact layer (3). The skin-friendly contact layer (3), the hollow heat-shielding functional layer (2), and the elastic support base layer (1) are composed of the following three types of fibers by weight percentage: 64% to 68% of 50S combed cotton fiber, 27% to 30% of 40D hollow polyester fiber, and 4.5% to 6.5% of 20D spandex fiber.

2. The heat-shielding stretch fabric according to claim 1, characterized in that: The elastic support base layer (1) is made of spandex fiber, preferably 20D fine denier spandex fiber, and the hollow heat-shielding functional layer (2) is made of yarn rich in hollow polyester fiber, preferably bio-based. The skin-friendly contact layer (3) is composed of yarn rich in combed cotton fibers, preferably 50S or higher combed cotton fibers.

3. The heat-shielding stretch fabric according to claim 2, characterized in that: The spandex fibers are used to form the elastic support base layer (1) by weft insertion or yarn addition, and the elastic support base layer (1) accounts for 4.5% to 6.5%, preferably 5.5%.

4. The heat-shielding stretch fabric according to claim 3, characterized in that: The hollow polyester fiber has a hollow cross section for forming a hollow heat-shielding functional layer (2) in the fabric for static air insulation, and the hollow heat-shielding functional layer (2) accounts for 27% to 30%, preferably 28.5%.

5. The heat-shielding stretch fabric according to claim 4, characterized in that: The skin-friendly contact layer (3) is used to provide a soft, smooth, and low-irritation feel to the direct skin contact layer, and the skin-friendly contact layer (3) accounts for 64% to 68%, preferably 66%.

6. The heat-shielding stretch fabric according to claim 5, characterized in that: The combed cotton fibers and the hollow polyester fibers are blended together to form the main yarn of the fabric.

7. The heat-shielding stretch fabric according to claim 6, characterized in that: The spandex fibers are woven in as bare yarn or core-spun yarn through weft knitting or weft-insertion processes to form a continuous and uniform elastic network base inside the fabric.

8. The preparation process of a heat-shielding stretch fabric according to claim 7, characterized in that, Includes the following steps: Step 1: Weaving, weaving combed cotton / hollow fiber The blended yarn and 20D spandex yarn are woven into a greige fabric on a double-sided circular knitting machine or a high-speed warp knitting machine. The spandex is fed in a pre-stretched state, and the stretch ratio is controlled between 2.8 and 3.5 by a tension adjustment mechanism to ensure uniform and moderate elasticity. Step 2: Scouring. The fabric is gently scouring to remove spinning oil and weaving wax; the temperature is strictly controlled at 90-98℃ and the time is 25-40 minutes. Step 3: Dyeing. A two-bath dyeing process is used to balance dyeing effect and fiber protection. The first bath involves using disperse dyes at a low temperature of 110-115℃ for hollow fiber optic cables. For fiber dyeing, keep warm for 30-50 minutes. For the second bath, after washing the fabric, adjust the dye bath to alkaline and use reactive dyes to dye the combed cotton fibers at a low temperature of 60-65℃. Step 4: Finishing, including softening and heat setting; The fabric is treated with a hydrophilic silicone softener after dyeing to enhance its ultimate smoothness, skin-friendly feel, and moisture-wicking properties. Heat setting, performed on a tenter frame, relies on ultra-low setting temperature and precise tension control.

9. The preparation process of a heat-shielding stretch fabric according to claim 8, characterized in that: In step one, multiple tension adjustment mechanisms are set between the yarn unwinding bracket and the double-sided circular knitting machine or high-speed warp knitting machine. The tension adjustment mechanisms are connected to the PLC control system of the double-sided circular knitting machine or high-speed warp knitting machine via cables. The tension adjustment mechanism includes a fixed bracket (4), on which a reduction drive motor (401) is fixedly mounted. The reduction drive motor (401) is electrically connected to the PLC controller in the double-sided circular knitting machine or the high-speed warp knitting machine via a cable, thereby facilitating automatic control of the reduction drive motor (401) by the PLC controller of the double-sided circular knitting machine or the high-speed warp knitting machine. A tension bracket (402) is fixedly connected to the inner wall of the fixed bracket (4). The surface of the tension bracket (402) is cross-shaped. An adjusting shaft (403) is rotatably connected to the surface of the tension bracket (402) through a bearing. One end of the adjusting shaft (403) is fixedly connected to the reduction output end of the reduction drive motor (401). The surface of the adjusting shaft (403) is rotatably connected to the surface of the fixed bracket (4) through a bearing. The tension adjusting cam disk (404) is fixedly sleeved on the surface of the adjusting shaft (403), and the positioning retainer (405) is slidably sleeved on the surface of the tension adjusting cam disk (404). The surface of the positioning retainer (405) is fixedly connected to the surface of the tension support (402).

10. The preparation process of a heat-shielding stretch fabric according to claim 9, characterized in that: The positioning retainer (405) has an oil storage tube (406) fixedly connected to its surface. The four oil storage tubes (406) are arranged in a ring array with the axis of the adjusting shaft (403) as the center. The surface of the oil storage tube (406) is fixedly connected to the surface of the tension bracket (402). A pressure regulating piston (407) is slidably connected to the inner wall of the oil storage pipe (406). A pressure regulating rod (408) is fixedly connected to the surface of the pressure regulating piston (407) near the positioning retainer (405). One end of the pressure regulating rod (408) passes through and extends to the inner wall of the positioning retainer (405). One end of the pressure regulating rod (408) is rotatably connected to a contact wheel (409) via a wheel axle. The surface of the contact wheel (409) is slidably connected to the surface of the tension adjusting cam disc (404). The inner wall of the oil storage pipe (406) is slidably connected to a pressure-bearing piston (410), the surface of the pressure-bearing piston (410) is fixedly connected to a pressure-bearing rod (411), the surface of the pressure-bearing rod (411) is slidably connected to a sealing ring (412), and the surface of the sealing ring (412) is fixedly connected to the inner wall of the oil storage pipe (406). A pressure spring (413) is sleeved on the surface of the pressure rod (411), and the two ends of the pressure spring (413) are fixedly connected to the surface of the sealing ring (412) and the surface of the pressure piston (410), respectively. Hydraulic oil is provided inside the oil storage pipe (406) between the pressure-bearing piston (410) and the pressure-regulating piston (407); One end of the pressure rod (411) is fixedly connected to a guide wheel seat (414). The surface of the guide wheel seat (414) is L-shaped. A yarn guide wheel (415) is rotatably connected to the inner wall of the guide wheel seat (414). The two yarn guide wheels (415) are distributed at a 90-degree angle on the inner wall of the guide wheel seat (414).

Images