Sustainable thermal regulating double-sided knitted fabric and method of making same

Abstract

The application provides a sustainable heat-regulating double-sided knitted fabric and a preparation method thereof, and belongs to the field of textile technology. The sustainable heat-regulating double-sided knitted fabric has a single-layer or double-layer double-sided knitted structure, and comprises corresponding first and second surfaces. The first surface has a plurality of uniformly distributed basic holes. The second surface has a plurality of corresponding distributed basic holes and a plurality of functional holes, and the plurality of functional holes are uniformly distributed on the second surface. The yarn of the double-sided knitted fabric is a sustainable fiber material. When the back surface of the double-sided knitted fabric of the embodiment of the application contacts a skin layer, the warmth retention is poor and the heat conductivity is good. When the front surface of the fabric contacts the skin layer, the warmth retention is good and the heat conductivity is poor. The double-sided knitted fabric has a durable and sustainable heat-regulating performance, is basically not affected by repeated use and washing, and has a soft hand feeling.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, and in particular relates to a sustainable thermally controlled double-sided knitted fabric and its preparation method. Background Technology

[0002] Climate change, stemming from severe energy problems, is profoundly impacting people's lives. It is well known that extreme cold or heat can harm human health, causing discomfort or illness. Traditional solutions include indoor heating / cooling systems, which not only consume enormous amounts of energy and exacerbate climate change, but also fail to provide timely heat dissipation or insulation in outdoor environments. Textiles, acting as mediators between the human body and its environment, have garnered significant attention. They can flexibly regulate the comfort of the microenvironment near the skin, playing a crucial role in maintaining the body's thermal and moisture balance. Therefore, developing fabrics for temperature regulation—that is, fabrics that dissipate heat and wick away moisture in hot environments and retain warmth in cold environments—is of great importance.

[0003] Currently, many thermal management fabrics typically employ multilayer thin film or coating structures. For example, Chinese patent document CN113622204 A discloses a dual-functional thermal management fabric for both heat insulation and heat dissipation, and its preparation method. This fabric has metal nanoparticle layers and a porous polymer coating on both sides of the fiber fabric, resulting in a dual-functional thermal management fabric. While this thermal management fabric possesses heat insulation properties and can radiate heat, this method has the following drawbacks: 1. Poor wearability, including poor breathability, softness, and hand feel, making it unsuitable for human wear; 2. The functional materials and reagents used in the manufacturing process may cause environmental pollution and health problems, and the washing process generates a large amount of microplastics, impacting the sustainable development of the textile and apparel industry.

[0004] In addition, existing technologies also achieve fabric insulation through material and knitted structure design. For example, Chinese patent document CN 109112708 A discloses a heat-insulating, water-absorbing, and quick-drying fabric. This fabric is a double-knitted fabric consisting of a surface layer and an inner layer. The surface layer contains at least 20-40% by weight of heat-insulating yarn with a thermal conductivity of less than 0.08 W / m·℃, and the inner layer is 100% polyester elastic yarn. While this knitted fabric exhibits good heat insulation, this design lacks the difference in heat insulation performance between the front and back sides, and the dual function of heat insulation and heat dissipation. Furthermore, this fabric primarily uses petroleum-based polymer-based chemical fiber materials, and the waste chemical fiber products are difficult to biodegrade naturally, causing long-term environmental pollution. Therefore, it is essential to develop a sustainable thermal control fabric through a simple and environmentally friendly design and manufacturing technology. Summary of the Invention

[0005] In view of this, the present invention provides a sustainable thermally regulated double-sided knitted fabric and its preparation method. The fabric provided by the present invention has the dual functions of heat preservation and heat dissipation, which can help individuals maintain a comfortable microclimate in outdoor environments, and is also environmentally friendly and sustainable.

[0006] This invention provides a sustainable heat-controlled double-knitted fabric with a single-layer or double-layer double-knitted structure. The double-knitted fabric includes corresponding first and second surfaces. The first surface has a plurality of uniformly distributed basic holes, and the pore area of ​​each basic hole is less than 0.7 mm². 2 The second surface has a plurality of correspondingly distributed basic holes and a plurality of functional holes, each of the functional holes having a pore area of ​​0.75 mm². 2 -30mm 2 The plurality of functional pores are evenly distributed on the second surface; the yarn of the double-knitted fabric is a sustainable fiber material.

[0007] As a further improvement of the present invention, the pore area of ​​each of the basic holes is 0.01 mm². 2 -0.7mm 2 .

[0008] As a further improvement of the present invention, the porosity of the plurality of functional holes on the second surface is 2%-20%.

[0009] As a further improvement of the present invention, the yarn of the double-knitted fabric is one or more of natural fibers, environmentally friendly modified natural fibers, and biocompatible chemical fiber materials.

[0010] As a further improvement of the present invention, the double-knitted fabric includes a knitted structure of plain knit, rib knit, or double reverse knit as the basic perforation.

[0011] As a further improvement of the present invention, the fiber-to-air ratio of the first surface of the double-knitted fabric is greater than that of the second surface.

[0012] This invention provides a method for preparing a sustainable heat-controlled double-knitted fabric as described above, comprising the following steps:

[0013] Sustainable fiber yarns are used to perform double-knitting according to a certain weave structure to obtain a sustainable heat-controlled double-knitted fabric. The double-knitted fabric includes corresponding first and second surfaces. The first surface has multiple uniformly distributed basic holes, each with a pore area of ​​less than 0.7 mm². 2 The second surface has a plurality of correspondingly distributed basic holes and a plurality of functional holes, each of the functional holes having a pore area of ​​0.75 mm². 2 -30mm2 The plurality of functional holes are evenly distributed on the second surface.

[0014] As a further improvement of the invention, the sustainable fiber yarn is made by ring spinning, air-jet spinning or jet spinning.

[0015] As a further improvement of the present invention, the plurality of functional holes are formed by knitting and / or laser cutting.

[0016] As a further improvement of the present invention, the preparation method further includes dyeing and / or finishing treatment after double-sided knitting.

[0017] Compared with existing technologies, this invention provides a sustainable heat-controlled double-sided knitted fabric and its preparation method. The heat-controlled double-sided knitted fabric comprises a uniform single-layer or multi-layer double-sided knitted structure. One side of the double-sided knitted structure is mainly composed of multiple basic holes, denoted as the first surface. The other side is denoted as the second surface, which is mainly composed of the basic holes and multiple functional holes. The pore area of ​​each basic hole is less than 0.7 mm². 2 The pore area of ​​each of the aforementioned functional pores is 0.75 mm². 2 -30mm 2 The yarn used in the double-knitted fabric is a sustainable fiber material. This invention achieves different fiber-to-air ratios on both sides through the differentiation of the two surface structures, thereby controlling the thermal properties of the knitted fabric. Based on the difference in thermal conductivity between air and the sustainable fiber material used, the two knitted surfaces exhibit different thermal conductivity and warmth retention; generally, the fiber-to-air ratio on the front (first surface) is greater than that on the back (second surface). In this invention, when the back side is in contact with the skin, its warmth retention is poor, but its thermal conductivity is good; conversely, when the front side of the fabric is in contact with the skin, its warmth retention is good, but its thermal conductivity is poor. The double-knitted fabric's controlled thermal properties are durable and largely unaffected by repeated use and washing, and it has a soft hand feel.

[0018] The preparation method described in this invention includes: designing the air content ratio of the front and back fibers; designing the shape and size of the basic and functional pores; designing and configuring the basic knitted fabric structure on both sides according to the designed fiber air content ratio and pore specifications; selecting the functional pore forming method; and selecting and rationally configuring the front and back fiber materials in combination with specific functional requirements; and weaving on a yarn machine to obtain the sustainable thermoregulating double-sided knitted fabric. This invention achieves the preparation of thermoregulating double-sided knitted fabric through the above method. The special knitted fabric pore structure design, with specific differences in the front and back structures, results in differences in the warmth retention of the two sides, achieving the dual functions of heat preservation and heat dissipation. This allows the fabric to help individuals maintain a comfortable microclimate in outdoor environments. Applying this invention to the production of thermoregulating fabrics can greatly improve the thermal and moisture comfort of the fabric. Furthermore, this invention has wide applicability, simplifies the production process, and, based on the fabric's structural design and sustainable fiber materials, integrates the fabric's functional design into the conventional weaving process, eliminating the need for additional coatings or nanoparticle additions. This makes it safer, more environmentally friendly, and sustainable, enabling large-scale production and subsequent recycling. This invention provides a thermally controlled double-sided knitted fabric with broad application prospects in outdoor sports, sportswear, and medical textiles, which can meet thermal comfort requirements in a more energy-efficient and economical way. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 Schematic diagrams illustrating the design principles of heat-controlled double-sided knitted fabrics for some embodiments of this application;

[0021] Figure 2 A front view of a heat-controlled double-sided knitted fabric provided in some embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the reverse side of a heat-controlled double-sided knitted fabric provided in some embodiments of this application;

[0023] Figure 4 This is a photograph of a heat-controlled double-sided knitted fabric provided in Embodiment 1 of this application;

[0024] Figure 5 This is a photograph of a heat-controlled double-sided knitted fabric provided in Embodiment 2 of this application;

[0025] Figure 6A photograph of a double-knitted fabric provided as Comparative Example 1 of this application;

[0026] Figure 7 This is a photograph of a heat-controlled double-sided knitted fabric provided in Embodiment 3 of this application;

[0027] Figure 8 This is a photograph of a heat-controlled double-sided knitted fabric provided in Embodiment 4 of this application;

[0028] Figure 9 A photograph of the double-sided fabric provided for Comparative Example 2 of this application. Detailed Implementation

[0029] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, the technical solution of the present invention will now be described in detail with reference to specific embodiments. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] This invention provides a sustainable heat-controlled double-knitted fabric having a single-layer or double-layer double-knitted structure. The double-knitted fabric includes corresponding first and second surfaces. The first surface has a plurality of uniformly distributed basic holes, each with a pore area of ​​less than 0.7 mm². 2 The second surface has a plurality of correspondingly distributed basic holes and a plurality of functional holes, each of the functional holes having a pore area of ​​0.75 mm². 2 -30mm 2 The plurality of functional pores are evenly distributed on the second surface; the yarn of the double-knitted fabric is a sustainable fiber material.

[0031] The fabric provided by this invention has dual functions of heat preservation and heat dissipation, which can help individuals maintain a comfortable microclimate in outdoor environments, and is also environmentally friendly and sustainable.

[0032] See Figures 1 to 3 , Figure 1 This is a schematic diagram illustrating the design principle of a heat-controlled double-sided knitted fabric provided in an embodiment of this application. Figure 2 This is a front view illustration. Figure 3 This is a reverse side diagram. Figure 1 In the diagram, 1 represents the first surface, typically the front; 2 represents the second surface, typically the back. The reddish-brown areas indicate multiple functional holes, while the remaining areas have evenly distributed basic holes (not marked in the diagram). The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate; this is merely a method of distinguishing objects with the same attributes in the embodiments of this application.

[0033] The heat-controlled double-sided knitted fabric described in this embodiment of the invention includes: corresponding first surface 1 and second surface 2, i.e., it has at least two layers of knitted fabric surface. The double-sided knitted fabric is mainly a knitted fabric composed of basic holes and functional holes, wherein the first surface 1, as the front side, has multiple pores with an area of ​​less than 0.7 mm². 2 The basic holes; the basic holes are holes (also called pores) that are naturally formed between yarns after knitting a sustainable fiber yarn or two or more fiber yarns. They have small openings or diameters, are evenly distributed and have narrow spacing, such as the spacing between two basic holes being 0.1mm-1mm.

[0034] Correspondingly, the second surface 2, as the reverse side, has a plurality of correspondingly distributed basic holes and functional holes of a certain area; the plurality of functional holes are uniformly distributed on the second surface 2, and can be formed by knitting or by laser cutting, etc. Furthermore, the pore area of ​​each functional hole is 0.75 mm². 2 -30mm 2 It is to some extent larger than the pore area of ​​the basic hole.

[0035] In this embodiment of the invention, the shape and size of the basic holes and functional holes are designed such that the functional holes can be any shape, such as circular, triangular, square, or rectangular; the basic holes can also be any shape. In some embodiments, the pore area of ​​each basic hole is 0.01 mm². 2 -0.7mm 2 Further, the thickness is 0.05-0.65mm. 2 For example, 0.1mm 2 0.12mm 2 0.2mm 2 0.3mm 2 0.33mm 2 0.4mm 2 0.45mm 2 0.5mm 2 0.55mm 2 0.6mm 2 etc.; the pore area of ​​each of the aforementioned functional pores is 0.75 mm². 2 -30mm 2 Further, it is 0.76-20mm. 2 It can also be 0.77-10mm 2 or 0.78-6mm 2 For example, 0.785mm 2 0.787mm 2 0.8mm2 1mm 2 2mm 2 2.5mm 2 5mm 2 Furthermore, the porosity of the plurality of functional pores on the second surface 2 can be 2%-20%. This embodiment of the invention achieves control over the thermal properties of the knitted fabric by differentiating the surface structures of the first surface 1 and the second surface 2 to achieve different fiber-to-air content ratios on both surfaces. The pore area is calculated by measuring the relevant geometric parameters of the pores, and is measured in a relaxed, flat state.

[0036] The yarn used in the double-sided knitted fabric is a sustainable fiber material, with both sides made of the same material. This sustainable fiber material is primarily one or more of natural fibers, environmentally friendly modified natural fibers, and biocompatible chemical fibers. The fiber material can be natural fibers such as cotton, linen, silk, and wool, biocompatible chemical fibers such as polylactic acid, or blended sustainable or recycled fibers. This heat-controlled double-sided knitted fabric can incorporate natural functional fiber materials to enhance its functionality; that is, natural fibers can be modified with environmentally friendly materials to form natural functional fiber materials. For example, adding antibacterial fibers such as chitosan can achieve antibacterial function.

[0037] Specifically, the sustainable fiber material can be a 30-60 count cellulose yarn, such as 40 count Xinjiang long-staple cotton; or a polylactic acid yarn with a fineness of 40-100D. Count (Ne) – at standard moisture regain, a multiple of 840 yards of yarn length per pound. That is, 1 pound of yarn is exactly 840 yards long, which is 1 count yarn. 1 pound of yarn is 21 × 840 yards long, and the yarn fineness is 21 count, written as 21s. Denier (D) – also known as denier, refers to the weight in grams of 9000 meters of yarn or fiber at standard moisture regain. It is a unit of length; the higher the weight, the coarser the yarn or fiber. It is often used to represent synthetic filaments, silk, etc. In some embodiments, the weight of the double-layer knitted fabric is 300 g / m². 2 -500g / m 2 However, there are no special restrictions on the specifications of the yarn.

[0038] Based on the difference in thermal conductivity between air and the sustainable fiber materials used, the two knitted surfaces in this invention exhibit different thermal conductivity and insulation properties. Generally, the fiber-to-air ratio on the front (first surface) is greater than that on the back (second surface). When the back surface is in contact with the skin, its insulation is poor, but its thermal conductivity is good. Conversely, when the front surface is in contact with the skin, its insulation is good, but its thermal conductivity is poor. This invention achieves the dual function of fabric insulation and heat dissipation, helping individuals maintain a comfortable microclimate in outdoor environments.

[0039] In embodiments of the present invention, the double-knitted fabric includes a knitted structure of plain knit, rib knit, or double reverse knit for the basic perforation. Plain knit fabric is typically knitted on a single-sided weft knitting machine; the yarns are sequentially bent into loops and passed from the reverse side of the old loops to the right side, forming a plain knit. Its two sides have different appearances: one side features V-shaped overlapping straight lines, i.e., the side where the loop column covers the loop arc is called the right side; the other side features arc-shaped overlapping lines, i.e., the side where the loop arc covers the loop column is called the reverse side. The double-knitted fabric has durable heat-regulating properties, is largely unaffected by repeated use and washing, and has a soft hand feel.

[0040] This invention provides a method for preparing a sustainable heat-controlled double-knitted fabric as described above, comprising the following steps:

[0041] Sustainable fiber yarns are used to perform double-knitting according to a certain weave structure to obtain a sustainable heat-controlled double-knitted fabric. The double-knitted fabric includes corresponding first and second surfaces. The first surface has multiple uniformly distributed basic holes, and the pore area of ​​each basic hole is less than 0.7 mm². 2 The second surface has a plurality of correspondingly distributed basic holes and a plurality of functional holes, each of the functional holes having a pore area of ​​0.75 mm². 2 -30mm 2 The plurality of functional holes are evenly distributed on the second surface.

[0042] The preparation method described in some embodiments of the present invention includes the following steps:

[0043] S1. Design of the air content ratio of the front and back fibers; design of the shape and size of the basic holes and functional holes;

[0044] S2. Based on the fiber air content ratio and pore size designed in step S1, configure the basic knitted fabric structure on both sides.

[0045] S3. Based on specific functional requirements, select and rationally configure sustainable fiber materials on both sides to produce yarn, which can then be woven on a machine to form functional holes.

[0046] S4. Depending on the requirements, fabric dyeing and / or finishing treatments can also be performed.

[0047] In embodiments of the present invention, a knitted structure including basic holes and functional holes is first designed and configured; simultaneously, commercially available sustainable fiber yarns can be produced or used. The knitted structure, etc., is as described above; for example, basic holes and functional holes of any shape can be used, as long as their pore area is satisfied. In the design of the fiber-to-air ratio on the front and back sides, the fiber-to-air ratio on the front side is greater than that on the back side.

[0048] The basic knitted fabric structure on both sides is designed and configured according to the designed fiber air content ratio and hole specifications. This basic knitted fabric structure can be plain knit, rib knit, double-sided knit, etc. Based on heat control and functional requirements, fiber and functional fiber types are selected and mixed according to a pre-set fiber mass percentage. The yarn can be produced using ring spinning, air-jet spinning, or other spinning methods. In this embodiment of the invention, the fabric is woven, dyed, and finished sequentially. Functional holes of a certain area can be formed by knitted structure design or laser cutting, thereby obtaining the sustainable heat-controlled double-sided knitted fabric.

[0049] Applying the preparation method of this invention to the production of thermoregulatory fabrics significantly improves heat and moisture conduction performance. The fabric prepared according to this invention employs a special knitted fabric pore structure design; the difference in structure between the front and back sides results in differences in warmth retention on both sides, achieving a dual function of heat preservation and heat dissipation. This allows the fabric to help individuals maintain a comfortable microclimate in outdoor environments. Applying this invention to the production of thermoregulatory fabrics greatly improves the thermal and moisture comfort of the fabric, while also offering wide applicability. Furthermore, based on the fabric's structural design, it is environmentally friendly and sustainable. This invention simplifies the production process, integrating the functional design of the fabric into the conventional weaving process, eliminating the need for additional coating or nanoparticle addition steps, enabling large-scale production and subsequent recycling. This sustainable thermoregulatory double-sided fabric has broad application prospects in outdoor sports, sportswear, and medical textiles, providing a more energy-efficient and economical way to meet thermal comfort needs.

[0050] To better illustrate the present invention, further examples are provided below. In the examples, all original reagents and materials are commercially available, and experimental methods without specific experimental conditions are conventional methods and conditions well known in the art.

[0051] Example 1

[0052] This embodiment provides a multidimensional thermally modulated double-sided fabric and its preparation method, including the following steps:

[0053] S1. Design of the air content ratio of the front and back fibers; design of the shape and size of the basic holes and functional holes; Figure 1-3It provides schematic diagrams of the design principles of heat-controlled double-sided knitted fabrics, front and back sides. By designing different functional porosities on the front and back sides, the fiber-to-air content ratio on the front side is greater than that on the back side. The functional porosity of the front side is designed to be 0%, and the functional porosity of the back side is designed to be 2.7%.

[0054] Furthermore, the basic holes and functional holes are designed to be approximately circular in shape, with a single basic hole having an area of ​​0.5 mm². 2 The spacing is 0.7mm, and the area of ​​the functional holes is 0.787mm². 2 The spacing is 5mm.

[0055] S2. Based on the fiber air content ratio and pore size designed in step S1, configure the basic knitted fabric structure on both sides.

[0056] A two-layer fabric structure is used to achieve different fiber air content ratios on the front and back sides. The outer layer is the front side of the fabric, and the inner layer is the back side. Both sides are knitted, and the weft plain knit structure is used.

[0057] S3. Based on specific functional requirements, select and rationally configure the fiber materials for both the front and back sides. Considering sustainability requirements, the natural breathability, high moisture-wicking properties, and soft, comfortable feel of cotton fibers are leveraged to select natural cotton fibers for both the inner and outer layers, thus enabling yarn production. The yarn uses 32s cotton yarn; the production method is ring spinning, and the yarn production process is as follows: opening and cleaning → carding → drawing → roving → spinning → post-processing.

[0058] Then it was woven on a flat knitting machine to obtain a heat-controlled double-sided knitted fabric (weight 414g / m²). 2 The functional holes are circular in shape and evenly distributed. The forming method for these functional holes is similar to that of knitted perforations, such as... Figure 4 As shown.

[0059] The heat-regulating double-sided knitted fabric prepared in Example 1 was tested for its thermal insulation performance using a KES-F7 THERMO LABOⅡ fabric. The test results showed that when the reverse side of the heat-regulating double-sided knitted fabric was in contact with the skin, its thermal insulation rate was 36.47%, and when the front side was in contact with the skin, its thermal insulation rate was 38.82%. The processing method provided by this invention achieves differentiated thermal insulation rates on both sides, thereby realizing the thermal regulation of the fabric (effectively balancing the needs of warmth and heat dissipation in specific environmental applications, adapting to wearing needs under different environmental conditions). After 10 washes, it still maintains its thermal regulation performance, indicating its durable function. Furthermore, this fabric can be woven on a flat knitting machine, enabling the production of seamless garments.

[0060] Example 2

[0061] Example 2 provides a heat-controlled double-sided knitted fabric and its preparation method. Compared with Example 1, the difference lies in the following: the ratio of the air content of the front and back fibers in step S1 is changed; the functional porosity of the front is designed to be 0%, and the functional porosity of the back is designed to be 19.6%; the shapes of the basic holes and functional holes are designed to be approximately circular, and the area of ​​a single basic hole is 0.5 mm². 2 The spacing is 0.7mm, and the area of ​​the functional holes is 0.785mm². 2 The spacing is 1mm, such as Figure 5 As shown. The remaining steps of Example 2 are basically the same as those of Example 1, and will not be repeated here. Test results show that when the reverse side of the heat-controlled double-sided knitted fabric is in contact with the skin layer, its warmth retention rate is 35.29%, and when the front side of the heat-controlled double-sided knitted fabric is in contact with the skin layer, its warmth retention rate is 41.18%.

[0062] Example 3

[0063] Example 3 provides a heat-controlled double-sided knitted fabric and its preparation method. Compared with Examples 1 and 2, the difference lies in the change of the air content ratio of the front and back fibers in step S1. The functional porosity of the front side is designed to be 0%, and the functional porosity of the back side is designed to be 28%. The shapes of the basic holes and functional holes are designed to be approximately circular. The remaining steps of Example 3 are basically the same as those of Examples 1 and 2, and will not be repeated here. Test results show that when the back side of the heat-controlled double-sided knitted fabric is in contact with the skin layer, its warmth retention rate is 35.29%, and when the front side of the heat-controlled double-sided knitted fabric is in contact with the skin layer, its warmth retention rate is 35%.

[0064] Comparative Example 1

[0065] The comparative example has a functional porosity of 0% on both sides. The basic holes are designed to be approximately circular in shape, and cotton fiber is selected as the fiber material. The area of ​​a single basic hole is 0.5 mm². 2 The spacing is 0.7mm, such as Figure 6 As shown in the figure. The test results show that when the reverse side of the double-knitted fabric is in contact with the skin, its warmth retention rate is 41.18%, and when the right side of the double-knitted fabric is in contact with the skin, its warmth retention rate is also 41.18%. The results indicate that there is no difference in warmth retention between the front and back sides.

[0066] Example 4

[0067] Example 4 provides a heat-controlled double-sided knitted fabric and its preparation method. Compared with Example 1, the difference lies in: changing the specific functional requirements in step S3, selecting and rationally configuring the front and back fiber materials, selecting polylactic acid fiber material made from plant raw materials such as corn starch, designing the functional porosity of the front side to be 0%, and the functional porosity of the back side to be designed to be 8.58%, designing the shape of the basic holes and functional holes to be approximately circular, and the shape of a single basic hole as shown in the figure. Figure 7 As shown. The remaining steps of Example 3 are basically the same as those of Example 1, and will not be repeated here. Test results show that when the reverse side of the heat-controlled double-sided knitted fabric is in contact with the skin layer, its warmth retention rate is 49.39%, and when the front side of the heat-controlled double-sided knitted fabric is in contact with the skin layer, its warmth retention rate is 51.23%.

[0068] Example 5

[0069] Example 5 provides a heat-controlled double-sided knitted fabric and its preparation method. Compared with Example 1, the difference lies in: changing the specific functional requirements in step S3, selecting and rationally configuring the front and back fiber materials, selecting polylactic acid fiber material made from plant raw materials such as corn starch, designing the functional porosity of the front side to be 0%, and designing the functional porosity of the back side to be 19.6%, such as... Figure 8 As shown. The remaining steps of Example 4 are basically the same as those of Example 1, and will not be repeated here. Test results show that when the reverse side of the heat-controlled double-sided knitted fabric is in contact with the skin layer, its warmth retention rate is 48.29%, and when the front side of the heat-controlled double-sided knitted fabric is in contact with the skin layer, its warmth retention rate is 53.85%.

[0070] Comparative Example 2

[0071] The comparative example has 0% functional porosity on both sides. The basic pores are designed to be approximately circular in shape, and polylactic acid is selected as the material. The functional porosity on both sides is designed to be 0%. Figure 9 As shown in the figure, the test results show that the warmth retention rate is 45.6% when the reverse side of the double-sided fabric is in contact with the skin, and also 45.6% when the front side of the double-sided fabric is in contact with the skin. The results indicate that there is no difference in warmth retention between the front and back sides.

[0072] Furthermore, other comparative results show that there is no trend of significant differences between the two sides as high as the functional porosity.

[0073] As demonstrated by the above embodiments, this invention achieves the preparation of thermoregulatory double-sided knitted fabrics through the aforementioned method. The special knitted fabric pore structure design, with specific differences in the front and back structures, results in differences in warmth retention on both sides, achieving the dual functions of heat preservation and heat dissipation. This allows the fabric to help individuals maintain a comfortable microclimate in outdoor environments. Applying this invention to the production of thermoregulatory fabrics can significantly improve the thermal and moisture comfort of the fabric. Furthermore, this invention has wide applicability, simplifies the production process, and, based on the fabric's structural design and sustainable fiber materials, integrates the fabric's functional design into the conventional weaving process, making it safer, more environmentally friendly, and sustainable. It enables large-scale production and subsequent recycling. This thermoregulatory double-sided knitted fabric can be used in outdoor sports, sportswear, and medical textiles, meeting thermal comfort requirements in a more energy-efficient and economical way.

[0074] The above examples are only used to illustrate the technical features and implementation process of the present invention, and are not intended to limit the technical solutions of the present invention. It should be noted that those skilled in the art can still make modifications or equivalent substitutions to the present invention without departing from the principle of the present invention, and all such modifications or substitutions are covered by the protection of the present invention.

Claims

1. A sustainable thermally controlled double-sided knitted fabric, characterized in that, The fabric has a single-layer or double-layer double-knitted structure, the double-knitted fabric including corresponding first and second surfaces, the first surface having a plurality of uniformly distributed basic holes, each basic hole having a pore area of ​​less than 0.7 mm². 2 ; The second surface has a plurality of correspondingly distributed basic holes and a plurality of functional holes, each of the functional holes having a pore area of ​​0.75 mm². 2 -30mm 2 The plurality of functional pores are evenly distributed on the second surface; the yarn of the double-knitted fabric is a sustainable fiber material.

2. The sustainable thermally controlled double-sided knitted fabric according to claim 1, characterized in that, The pore area of ​​each of the aforementioned basic holes is 0.01 mm². 2 -0.7mm 2 .

3. The sustainable thermally regulated double-sided knitted fabric according to claim 1, characterized in that, The porosity of the plurality of functional pores on the second surface is 2%-20%.

4. The sustainable thermally controlled double-sided knitted fabric according to claim 1, characterized in that, The yarn of the double-knitted fabric is one or more of the following: natural fibers, environmentally friendly modified natural fibers, and biocompatible chemical fiber materials.

5. The sustainable thermally regulated double-knitted fabric according to any one of claims 1-4, characterized in that, The double-sided knitted fabric includes a knitted structure with basic holes that is plain knit, rib knit, or double reverse knit.

6. The sustainable thermally regulated double-knitted fabric according to any one of claims 1-4, characterized in that, The fiber-to-air ratio of the first surface of the double-knitted fabric is greater than that of the second surface.

7. A method for preparing a sustainable heat-controlled double-sided knitted fabric as described in any one of claims 1-6, comprising the following steps: By using sustainable fiber yarns and performing double-sided knitting according to a certain structure, a sustainable heat-controlled double-sided knitted fabric can be obtained. The double-knitted fabric includes corresponding first and second surfaces. The first surface has a plurality of uniformly distributed basic holes, each of which has a pore area of ​​less than 0.7 mm². 2 ; The second surface has a plurality of correspondingly distributed basic holes and a plurality of functional holes, each of the functional holes having a pore area of ​​0.75 mm². 2 -30mm 2 The plurality of functional holes are evenly distributed on the second surface.

8. The preparation method according to claim 7, characterized in that, The sustainable fiber yarn is produced by ring spinning, air-jet spinning, or jet spinning.

9. The preparation method according to claim 7, characterized in that, The multiple functional holes are formed by knitting and / or laser cutting.

10. The preparation method according to any one of claims 7-9, characterized in that, The preparation method further includes dyeing and / or finishing treatment after double-sided knitting.

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