Multilayer far-infrared enhanced electromagnetic wave shielding fabric

Abstract

This invention provides a multi-layered far-infrared enhanced electromagnetic wave protective fabric. The fabric comprises a base layer, a far-infrared enhancing layer, and a functional inner layer, bonded together through at least one of lamination, flocking, or hot-pressing techniques. The base layer comprises a nylon fleece fabric and an electromagnetic wave shielding layer containing stainless steel fibers, disposed on the nylon fleece fabric to provide electromagnetic wave protection. The far-infrared enhancing layer comprises a flocked cotton fabric layer and a far-infrared polyester fiber layer. The flocked cotton fabric layer contains far-infrared mineral powder, and the far-infrared polyester fiber layer contains far-infrared functional minerals to enhance far-infrared emission efficiency. The functional inner layer comprises a knitted fabric layer and a fleece fabric layer. The knitted fabric layer contains far-infrared functional minerals, and the fleece fabric layer is disposed on the knitted fabric layer. This invention effectively provides electromagnetic wave shielding and far-infrared enhancement functions, and is suitable for personal protective clothing, medical and health care products, and smart health clothing.

Description

Technical Field

[0001] This invention relates to the field of textile materials technology, and in particular to a protective fabric with a multi-layer structure that enhances far-infrared radiation and can shield electromagnetic waves. Prior Technology

[0002] In existing technologies, electromagnetic wave shielding materials and far-infrared functional fabrics have been applied in different fields. However, most of these technologies focus on a single function, such as protection against electromagnetic interference or the thermal effect of far-infrared rays, lacking a composite fabric that can simultaneously provide both electromagnetic wave protection and far-infrared enhancement. Furthermore, existing shielding fabrics often suffer from poor breathability and comfort due to inadequate use of metal fibers, while far-infrared functional fabrics may be affected by uneven distribution of far-infrared emitting materials. Therefore, there is still room for technological improvement.

[0003] Current electromagnetic wave shielding fabrics primarily utilize metal fibers, conductive coatings, or plating technologies to reduce electromagnetic interference (EMI). For example, some technologies weave stainless steel or silver fibers into the fabric to make it conductive, thus absorbing and reflecting electromagnetic waves. However, the main problems with such fabrics are: firstly, the distribution of metal fibers in the fabric is prone to structural changes due to stretching or washing, leading to a decrease in shielding effectiveness; secondly, metal fibers may reduce the fabric's softness and comfort, limiting its application. Furthermore, while coating or plating techniques can improve the fabric's conductivity, the coating is easily peeled off with long-term use or washing, making the protective effect unsustainable. Therefore, current electromagnetic wave shielding fabrics on the market still suffer from insufficient durability and comfort.

[0004] On the other hand, far-infrared fabrics primarily enhance their far-infrared emission capabilities by adding far-infrared functional materials, such as germanium, zirconium oxide, or silicates, to the textile fibers. These far-infrared materials absorb energy from the environment and re-radiate it in the form of far-infrared rays, which helps promote blood circulation, provide warmth, and improve physiological functions. However, most far-infrared fabrics in the current technology are manufactured using single-layer or simple blending methods. The far-infrared functional materials may be affected by the processing method, leading to uneven distribution and unstable far-infrared emission. In addition, the functional coating of some far-infrared coated fabrics may peel off after long-term use or washing, resulting in a decrease in far-infrared emission effectiveness. Therefore, the durability and functional stability of existing far-infrared fabrics still need to be improved.

[0005] While some fabrics on the market combine electromagnetic wave shielding and far-infrared functions, most of these technologies simply layer or mix the two types of materials without considering the impact of the bonding method on the fabric's performance. For example, some technologies directly bond the electromagnetic wave shielding layer to the far-infrared functional fabric; however, this layered structure may delaminate due to bending, friction, or washing, reducing its effectiveness. Furthermore, some technologies attempt to combine the two functions through double-sided weaving, but the different material selection and processing methods limit the fabric's breathability and softness. Therefore, existing electromagnetic wave protection and far-infrared fabrics still face technological bottlenecks, failing to simultaneously achieve high performance, comfort, and durability.

[0006] To address the aforementioned technical problems, this invention proposes a multi-layered far-infrared enhanced electromagnetic wave protective fabric. Through lamination, flocking, or hot-pressing techniques, the fabric ensures the bonding strength between functional layers, maintaining stable electromagnetic wave shielding effectiveness and far-infrared emission even after long-term use and washing. Furthermore, this fabric employs a specific composite layer design to ensure breathability and wearing comfort, enabling its application in personal protection, healthcare, and smart health clothing, thus solving many problems inherent in existing technologies. Summary of the Invention

[0007] Therefore, the object of this invention is to provide a multi-layered far-infrared enhanced electromagnetic wave protective fabric, comprising a base layer, a far-infrared enhancing layer, and a functional inner layer, which are bonded together by at least one of lamination, flocking, or hot pressing techniques. The base layer comprises a nylon fleece fabric and an electromagnetic wave shielding layer, the electromagnetic wave shielding layer being disposed on the nylon fleece fabric and containing stainless steel fibers to provide electromagnetic wave shielding. The far-infrared enhancing layer comprises a flocked cotton fabric layer and a far-infrared polyester fiber layer, the flocked cotton fabric layer being disposed on the far-infrared polyester fiber layer, the flocked cotton fabric layer containing far-infrared mineral powder, and the far-infrared polyester fiber layer containing far-infrared functional minerals to enhance far-infrared emission efficiency. The functional inner layer comprises a knitted fabric layer and a fleece fabric layer, the knitted fabric layer containing far-infrared functional minerals, and the fleece fabric layer being disposed on the knitted fabric layer to improve the fabric's wearing comfort and functional stability.

[0008] The nylon fleece fabric is made of a blend of polyamide and polyurethane, which gives the base layer good elasticity and abrasion resistance, improving the fabric's durability and adaptability.

[0009] The electromagnetic wave shielding layer is a conductive textile layer containing stainless steel fibers. The content of the stainless steel fibers is 5% to 40% of the total weight of the fabric, ensuring that the electromagnetic wave shielding layer can maintain stable electromagnetic wave shielding performance and provide good anti-interference performance.

[0010] The far-infrared mineral powder contained in the flocked cotton fabric layer is selected from germanium stone, zircon, silicate, igneous rock or a combination thereof, and has a far-infrared emissivity of more than 80%, so as to enhance the far-infrared emission effect of the fabric and promote the physiological comfort of the user.

[0011] The far-infrared polyester fiber layer contains far-infrared functional ceramic powder with a particle size ranging from 0.1 μm to 10 μm to ensure stable release of far-infrared rays and improve the absorption efficiency of far-infrared rays.

[0012] The knitted fabric layer has a double-knitted structure and contains compound far-infrared mineral powder to enhance the durability and breathability of the functional inner layer, making the fabric both functional and comfortable.

[0013] The fleece layer has a thickness between 0.3 mm and 1.5 mm to ensure the fabric's warmth while maintaining a soft touch and providing adequate comfort.

[0014] The flocked cotton fabric layer and the far-infrared polyester fiber layer of the far-infrared enhancement layer are fixed together by at least one of polymer bonding technology, melt bonding technology or needle punching technology to improve the structural stability and durability of the far-infrared enhancement layer.

[0015] This fabric is suitable for personal protective clothing, electromagnetic shielding clothing, medical and health products, or smart health clothing, to ensure that the fabric can perform its functions in different application fields and enhance market competitiveness.

[0016] The fabric can be further coated with an antibacterial coating containing nano silver, zinc oxide, or a combination thereof to provide additional antibacterial and deodorizing functions, thereby enhancing the fabric's hygienic properties and long-term safety. Simple Explanation of the Diagram

[0017] Figure 1 is a schematic diagram of a multi-layered far-infrared enhanced electromagnetic wave protective fabric proposed in this invention. Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the following detailed description is provided in conjunction with specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Referring to Figure 1, a multi-layered far-infrared enhanced electromagnetic wave protective fabric 10 proposed in this invention is characterized by being composed of a base layer 11, a far-infrared enhancing layer 12, and a functional inner layer 13.

[0021] The base layer 11 includes a nylon napped fabric 111 and an electromagnetic wave shielding layer 112. The electromagnetic wave shielding layer 112 is disposed on the nylon napped fabric 111 and contains stainless steel fibers. The nylon napped fabric 111 may be made of at least a blend of polyamide and polyurethane. In one embodiment, the nylon napped fabric 111 is made of a blend of 50% to 90% polyamide and 10% to 50% polyurethane, and it may be woven using warp knitting, weft knitting, or brushing techniques.

[0022] A far-infrared enhancement layer 12 is disposed on the base layer 11. The far-infrared enhancement layer 12 includes a flocked cotton fabric layer 121 and a far-infrared polyester fiber layer 122. The flocked cotton fabric layer 121 is disposed on the far-infrared polyester fiber layer 122. The flocked cotton fabric layer 121 contains far-infrared mineral powder, and the far-infrared polyester fiber layer 122 contains far-infrared functional minerals. The far-infrared functional minerals are fixed inside the fibers by melt spinning or polymer bonding technology to improve the washability and functional stability of the far-infrared polyester fiber layer 122. The flocked cotton fabric layer 121 uses electrostatic flocking technology to evenly distribute the far-infrared mineral powder on the fabric surface, and undergoes heat treatment or high-pressure infiltration processing to improve the adhesion of the far-infrared mineral powder and the far-infrared emission efficiency.

[0023] A functional inner layer 13 is disposed on the far-infrared enhancement layer 12. The functional inner layer 13 includes a knitted fabric layer 131 and a fleece fabric layer 132. The knitted fabric layer 131 contains far-infrared functional minerals, and the fleece fabric layer 132 is disposed on the knitted fabric layer 131. The far-infrared functional minerals contained in the knitted fabric layer 131 are selected from germanium, zircon, silicates, igneous rocks, or combinations thereof, and their particle size is preferably between 0.1 μm and 10 μm. Furthermore, the far-infrared functional minerals are uniformly dispersed in the fibers of the knitted fabric layer 131 in nano-scale powder form and fixed to the fiber surface through melt spinning or coating technology to improve the washability and functional stability of the knitted fabric layer 131.

[0024] The knitted fabric layer 131 can be a double-knitted structure, and a porous, breathable structure is formed through high-density knitting technology to improve the durability and breathability of the functional inner layer 13. The fleece fabric layer 132 is disposed on the knitted fabric layer 131 and is fixed by at least one of lamination, melt bonding, or needle punching techniques to ensure the structural stability and durability of the functional inner layer 13.

[0025] The base layer 11, the far-infrared reinforcing layer 12, and the functional inner layer 13 are bonded together through at least one of lamination, flocking, or hot pressing techniques. The lamination techniques include high-temperature high-pressure lamination, cold-press lamination, or hot-melt lamination; the flocking techniques include electrostatic flocking or wet flocking; and the hot pressing techniques include hot-melt adhesive lamination or ultrasonic hot pressing. The lamination technique is suitable for bonding multilayer composite materials, the flocking technique is suitable for the uniform attachment of functional particles, and the hot pressing technique is suitable for fixing hot-melt fibers, thus stabilizing the structure of the base layer 11, the far-infrared reinforcing layer 12, and the functional inner layer 13. The appropriate bonding method is selected based on the compatibility of different materials. The lamination technique is suitable for bonding polymer substrates, the flocking technique is suitable for fixing far-infrared powders, and the hot pressing technique is suitable for the composite of high-melting-point and low-melting-point fibers. The fabric maintains its interlayer bonding strength and electromagnetic wave shielding effectiveness and far-infrared emission capability even after more than 100 washes.

[0026] The aforementioned nylon fleece fabric 111 is made of polyamide and polyurethane blend, which mainly provides the elasticity and abrasion resistance of the base layer 11.

[0027] A multi-layered far-infrared enhanced electromagnetic wave protective fabric 10 is disclosed, wherein the electromagnetic wave shielding layer 112 is a conductive textile layer containing stainless steel fibers. The stainless steel fibers account for 5% to 40% of the total weight of the fabric, and the diameter of the stainless steel fibers ranges from 1 μm to 40 μm, and they are selected from 316L or 304 stainless steel alloys. The stainless steel fibers are arranged within the conductive textile layer using plain weave, twill weave, or woven techniques to ensure the uniformity and shielding effectiveness of the electromagnetic wave shielding layer 112. The electromagnetic wave shielding layer 112 achieves an electromagnetic wave shielding effectiveness of 20 dB to 60 dB in the frequency range of 1 MHz to 10 GHz, and its electromagnetic wave shielding effectiveness attenuation rate does not exceed 10% after more than 100 washes. This is further elaborated in the embodiment to ensure that the electromagnetic wave shielding layer 112 has stable electromagnetic wave shielding effectiveness.

[0028] The far-infrared mineral powder contained in the flocked cotton fabric layer 121 is selected from germanium, zircon, silicates, igneous rocks, or combinations thereof. The particle size of the far-infrared mineral powder ranges from 0.1 μm to 10 μm and is uniformly distributed on the surface of the flocked cotton fabric layer 121. It is fixed inside the fabric through electrostatic flocking technology or high-pressure infiltration technology to improve the stability of far-infrared radiation. After more than 100 washes, the far-infrared emissivity of the far-infrared mineral powder remains above 80%. This far-infrared emissivity is tested according to JIS L1951 or ASTM C1371 standards.

[0029] The far-infrared polyester fiber layer 122 contains far-infrared functional ceramic powder, the particle size of which ranges from 0.1μm to 10μm, in order to improve the far-infrared emission efficiency.

[0030] The knitted fabric layer 131 has a double-knitted structure and contains compound far-infrared mineral powder to improve the durability and breathability of the functional inner layer 13.

[0031] The fleece layer 132 has a thickness between 0.3 mm and 1.5 mm to provide adequate warmth and comfort. The fleece layer 132 is made of at least 80% polyester fiber or blended far-infrared functional fibers and is manufactured using double-sided brushing or high-density weft knitting techniques to enhance its warmth and softness. The fleece layer 132's pile structure undergoes electrostatic napping treatment to form a porous air layer, improving thermal insulation and maintaining adequate breathability.

[0032] The flocked cotton fabric layer 121 and the far-infrared polyester fiber layer 122 of the far-infrared enhancement layer 12 are fixed by at least one of polymer bonding technology, melt bonding technology or needle punching technology to improve the structural stability and durability of the far-infrared enhancement layer 12.

[0033] The fabric 10 is suitable for personal protective clothing, electromagnetic shielding clothing, medical and health products, or smart health clothing. Specifically, the fabric 10 can be used in personal protective clothing, including protective clothing for workers in electromagnetic wave environments, electromagnetic protective clothing for pregnant women, and protective clothing for those who use electronic devices for extended periods. It can also be used in electromagnetic shielding clothing, such as electromagnetic wave protective gowns for special operations personnel, stealth reconnaissance work clothes, and anti-detection protective clothing for military or intelligence personnel. In addition, the fabric 10 can be used in medical and health products, including far-infrared protective gear that can help improve blood circulation (such as waist supports, knee supports, and wrist supports), far-infrared therapy blankets for long-term bedridden patients, and antibacterial electromagnetic wave protective clothing for patients. On the other hand, the fabric 10 can be used in smart health clothing, such as sportswear with built-in electromagnetic wave protection and far-infrared blood circulation promotion functions, home health monitoring clothing, far-infrared smart sleepwear with electromagnetic shielding function, or health sensing underwear.

[0034] The fabric 10 may be further coated with an antibacterial coating comprising nano-silver, zinc oxide, or a combination thereof, wherein the nano-silver has a particle size ranging from 1 nm to 100 nm, and the zinc oxide has a particle size ranging from 10 nm to 500 nm. The antibacterial coating may be applied to the surface or internal fiber structure of the fabric 10 via dip coating, spray coating, or sol-gel technology. The antibacterial coating, tested according to ISO 22196 or ASTM E2149, exhibits an antibacterial rate of over 99%, and maintains an antibacterial rate of over 95% after more than 50 washes.

[0035] However, the above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and patent specification of the present invention shall still fall within the scope of the present invention.

[0036] 10: Fabric 11: Grassroots 111: Nylon brushed fabric 112: Electromagnetic wave shielding layer 12: Far-infrared enhancement layer 121: Flocked cotton fabric 122: Far-infrared polyester fiber layer 13: Functional inner layer 131: Knitted fabric layer 132: Fleece layer

Claims

1. A multi-layered far-infrared enhanced electromagnetic wave protective fabric (10), characterized in that it comprises: A base layer (11) comprising a nylon fleece fabric (111) and an electromagnetic wave shielding layer (112), wherein the electromagnetic wave shielding layer (112) is disposed on the nylon fleece fabric (111) and contains stainless steel fibers, wherein the electromagnetic wave shielding layer (112) is a conductive textile layer containing stainless steel fibers, and the content of the stainless steel fibers is 5% to 40% of the total weight of the fabric; a far-infrared enhancement layer (12) disposed on the base layer (11), wherein the far-infrared enhancement layer (12) comprises a flocked cotton fabric layer (121) and a far-infrared polyester fiber layer (122), wherein the flocked cotton fabric layer (121) and the far-infrared polyester fiber layer (122) of the far-infrared enhancement layer (12) are bonded together by at least one of polymer bonding technology, melt bonding technology or needle punching technology. The flocked cotton fabric layer (121) is fixed on the far-infrared polyester fiber layer (122). The flocked cotton fabric layer (121) contains far-infrared mineral powder, and the far-infrared polyester fiber layer (122) contains far-infrared functional minerals. The fibers of the far-infrared polyester fiber layer (122) contain far-infrared functional ceramic powder. The particle size of the ceramic powder ranges from 0.1μm to 10μm to improve the far-infrared emission efficiency. A functional inner layer (13) is disposed on the far-infrared enhancement layer (12). The functional inner layer (13) includes a knitted fabric layer (131) and a fleece fabric layer (132). The knitted fabric layer (131) contains far-infrared functional minerals, and the fleece fabric layer (132) is disposed on the knitted fabric layer (131). The base layer (11), the far-infrared enhancement layer (12) and the functional inner layer (13) are bonded together by at least one of lamination, flocking or hot pressing techniques.

2. A multi-layered far-infrared enhanced electromagnetic wave protective fabric (10) as described in claim 1, wherein the nylon napped fabric (111) is made of a blend of polyamide and polyurethane.

3. A multi-layered far-infrared enhanced electromagnetic wave protective fabric (10) as described in claim 1, wherein the far-infrared mineral powder contained in the flocked cotton fabric layer (121) is selected from germanium stone, zircon, silicate, igneous rock or a combination thereof, and has a far-infrared emissivity of more than 80%.

4. A multi-layered far-infrared enhanced electromagnetic wave protective fabric (10) as described in claim 1, wherein the knitted fabric layer (131) has a double-sided knitted structure and contains compound far-infrared mineral powder.

5. A multi-layered far-infrared enhanced electromagnetic wave protective fabric (10) as described in claim 1, wherein the thickness of the fleece layer (132) is between 0.3 mm and 1.5 mm.

6. A multi-layered far-infrared enhanced electromagnetic wave protective fabric (10) as described in claim 1, wherein the fabric (10) is suitable for personal protective clothing, electromagnetic shielding clothing, medical and health care products or smart health clothing.

7. A multi-layered far-infrared enhanced electromagnetic wave protective fabric (10) as described in claim 1, wherein the fabric (10) may be further coated with an antibacterial coating comprising nano silver, zinc oxide or a combination thereof.

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