A coated fabric sheet and process for making the same

Abstract

The application discloses a kind of coated fabric sheet, including fabric, impregnated resin layer, identification layer and protective layer, the fabric is coated by impregnated resin layer, identification layer is printed on impregnated resin layer, protective layer covers identification layer and impregnated resin layer.The preparation process of the application has simple steps, low manufacturing cost, and the finished sheet obtained has good structural strength and appearance, strong applicability, and can be assembled on relatively soft products such as shoes and clothes in the form of hot pressing.

Description

Technical Field

[0001] This invention relates to the field of footwear and apparel technology, and in particular to a sheet material for covering fabrics and its preparation process. Background Technology

[0002] On softer products like footwear and apparel, traditional hard labels often negatively impact the wearing experience. Soft rubber labels, on the other hand, suffer from issues like printing fading and low structural strength. For example, directly printing images or logos on soft rubber labels results in noticeable color fading after a period of use. Therefore, a multi-layered composite production process is typically employed. The label image is printed on a base layer, protected by a composite layer, and finally, an adhesive layer is added to ensure adhesion to the substrate. Adding various composite layers significantly increases the overall thickness of the label, raising material costs. Furthermore, the production process is more complex, and defects in the composite layers can negatively impact the overall yield rate. Additionally, soft rubber labels lack flexibility during wear and tear, leading to bending and cracking.

[0003] Carbon fiber fabric, as a woven fabric with reflective properties and excellent mechanical properties, has broad application prospects in the footwear and apparel industry. However, due to its dense fibers, carbon fiber fabric is prone to fraying and unraveling at the edges during cutting, resulting in rough edges and even the shedding of carbon fiber filaments. This not only affects the appearance but the detached carbon fiber filaments may also cause skin irritation to the wearer. Furthermore, carbon fiber fabric itself is relatively stiff, lacking flexibility when directly applied to soft footwear and apparel products. Bending it easily leads to creases or cracks, making it difficult to match the soft texture of footwear and apparel.

[0004] In the prior art, patent CN224084750U discloses a crystal-coated carbon fiber fabric stabilizer and a sports shoe with the stabilizer. The stabilizer includes a carbon fiber fabric layer and a crystal-coated layer formed on the upper surface of the carbon fiber fabric layer by a crystal-coating process. A TPU material lower film layer is hot-pressed and shaped on the lower surface of the carbon fiber fabric layer. The crystal-coated layer is formed on the upper surface of the carbon fiber fabric layer by a crystal-coating process, thereby improving the overall integrity of the carbon fiber fabric under the binding effect of the crystal-coated layer. During cutting, the cut edges are bonded and fixed by the crystal-coated layer, thus preventing the edges from cracking and producing rough edges. During fixing, the lower film layer is hot-pressed and fixed to the midsole. After being heated, the lower film layer melts and solidifies, adhering and fusing to the side of the midsole. The fixing strength is high, and it is not easy to fall off or curl up. Moreover, since the thickness of the crystal-coated layer can be controlled by the crystal-coating time, the overall three-dimensionality of the stabilizer is greatly improved.

[0005] Patent CN114446143A discloses a composite-free single-layer in-film label, belonging to the field of in-film labels. This invention includes a base film layer and an adhesive coating layer. The base film layer is printed with an ink image, and the adhesive coating layer is applied to the side of the base film layer with the ink image. This invention has the following advantages and effects: the label eliminates the need for an intermediate composite layer; the adhesive coating provides protection and ensures adhesion to the carrier, reducing material and production costs, and improving product yield and production efficiency; furthermore, the ink layer has high hardness, better protecting the printed pattern, and possesses good conductivity, antistatic properties, and anti-sticking properties; the production process eliminates the need for composite processes and composite materials for each layer, greatly improving production efficiency and yield.

[0006] To address one of the aforementioned problems, this application provides a sheet material for covering fabric and its preparation process. Specifically, addressing issues such as fraying and loosening of carbon fiber cloth and other fabrics, insufficient flexibility, and low pattern precision in drop crystal processing in existing technologies, this application achieves a balance between softness and three-dimensional decorative effect through a combination of processes including resin impregnation coating, UV printing of markings, and protective layer coating with epoxy resin. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art by proposing a sheet material for covering fabric and its preparation process, which can solve the problems of fabric fraying and unraveling, while improving flexibility and facilitating subsequent heat treatment.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a sheet material for covering fabric, comprising fabric, resin impregnation layer, marking layer and protective layer, wherein the fabric is covered by resin impregnation layer, marking layer is printed on resin impregnation layer, and protective layer covers marking layer and resin impregnation layer.

[0009] Furthermore, as described above, the fabric divides the impregnated resin layer into a first impregnated resin layer and a second impregnated resin layer, with a marking layer printed on the second impregnated resin layer. A protective layer is combined with the first impregnated resin layer to cover the fabric, the second impregnated resin layer, and the marking layer.

[0010] Furthermore, the fabric described above is at least one of carbon fiber cloth, aramid cloth, fiberglass cloth, mesh cloth, or laser cloth.

[0011] Furthermore, as described above, both the impregnated resin layer and the protective layer are prepared by mixing the following materials:

[0012] Polyurethane resin: 96%-99%

[0013] Defoamer: 0.5%-2%

[0014] Leveling agent: 0.5%-2%

[0015] All percentages above are by weight.

[0016] Furthermore, the marking layer described above is formed by UV inkjet printing.

[0017] Furthermore, an optical film is also included between the fabric and the impregnated resin layer as described above.

[0018] A process for preparing a sheet covered with fabric includes the following steps:

[0019] S1. Impregnation: The fabric is laid flat in the mold, glue is poured in, the mold is closed and vacuum is drawn to obtain a board with the fabric covered by the impregnated resin layer.

[0020] S2. Printing: A marking layer is formed on the board by UV inkjet printing;

[0021] S3. Cutting: Position the board and cut it into individual semi-finished sheets with marking layers;

[0022] S4. Apply glue: Lay each semi-finished sheet flat and maintain spacing, apply a measured amount of glue to cover the upper surface and sides of the semi-finished sheet to obtain the finished sheet.

[0023] In step S1, a dispensing machine is used for dispensing. The raw material for dispensing is a mixture of polyurethane resin, defoamer, and leveling agent. The wetting temperature is 80°C and the duration is 30-60 minutes.

[0024] In step S2, each marking layer is printed at equal intervals, and UV light irradiation is maintained during the UV inkjet printing process, with the UV light wavelength being 365-425nm; in step S3, one of the marking layers is used as a positioning reference to clamp and cut the board.

[0025] In step S4, a fully automatic dispensing machine is used to apply the adhesive in a measured amount. The raw material for the dispensing is a mixture of polyurethane resin, defoamer, and leveling agent. The curing temperature of the dispensing is 70°C, and the curing time is 120 minutes.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The processing steps of this invention are simple. By impregnating the fabric with resin, the fabric is completely covered, which solves the problem of fraying and unraveling when cutting fabrics such as carbon fiber cloth. At the same time, the impregnating resin penetrates into the gaps between the fabric fibers, giving the sheet excellent overall flexibility, which can be assembled onto relatively soft products such as shoes and clothing by heat pressing.

[0028] The resin impregnation layer of this invention uses a polyurethane system, which has good flexibility and is suitable for subsequent hot bending. The finished product does not produce creases or cracks after bending.

[0029] The marking layer of this invention is formed by UV inkjet printing, which eliminates the need for plate making, achieves high pattern precision, and can realize complex patterns and gradient colors to meet personalized customization needs. Combined with the UV irradiation process, it ensures deep curing of the pattern and improves wear resistance.

[0030] This invention uses a fully automatic dispensing machine to apply adhesive in a quantitative manner to form a protective layer. The thickness of the adhesive layer is controllable, the surface is transparent and presents a crystal texture with a strong three-dimensional effect, and the protective layer completely covers the upper surface and sides of the sheet, providing all-round protection for the fabric and the label layer.

[0031] This invention can process various types of fabrics (carbon fiber fabric, aramid fabric, fiberglass fabric, mesh fabric, laser fabric, etc.), and has a wide range of applications. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a half-finished sheet according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of a finished sheet material according to Embodiment 2 of the present invention;

[0034] Figure 3 This is a schematic diagram of another structure of the finished sheet material according to Embodiment 2 of the present invention;

[0035] Figure 4 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0036] In the figure: 1. First impregnated resin layer; 2. Fabric; 3. Second impregnated resin layer; 4. Marking layer; 5. Protective layer; 6. Optical film. Detailed Implementation

[0037] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "fixed," "installed," "connected," "set," etc., should be interpreted broadly. For example, when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "installed" on another element, it can be directly installed on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a communication between the two elements.

[0039] Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1 (Basic Structure - Semi-finished Sheet Material)

[0042] Reference Figure 1As shown, a semi-finished sheet of fabric 2 (i.e., an intermediate product before the implementation of protective layer 5) of the present invention includes fabric 2, an impregnated resin layer, and a marking layer 4. The fabric 2 is covered by the impregnated resin layer, which divides the impregnated resin layer into a first impregnated resin layer 1 (located below the fabric 2) and a second impregnated resin layer 3 (located above the fabric 2). The marking layer 4 is printed on the upper surface of the second impregnated resin layer 3. In this embodiment, the fabric 2 is made of 3K carbon fiber woven fabric, which has excellent mechanical properties. The raw materials of the impregnated resin layer are prepared by mixing the following components in weight percentage: 97.5% polyurethane resin, 1.5% defoamer (such as BYK-066N), and 1.0% leveling agent (such as BYK-333). Among them, the polyurethane resin is preferably aliphatic polyurethane resin to improve the resistance to yellowing, the defoamer is preferably an organosilicon defoamer to eliminate bubbles generated during the impregnation process, and the leveling agent is preferably a polyether-modified polysiloxane leveling agent to improve the leveling properties of the resin on the fabric surface. In addition, the labeling layer is printed on the second impregnated resin layer by a UV digital printer using UV inkjet printing. The ink is selected from the soft UV curing ink of Shenzhen Moku Company. The UV lamp (365-425nm, 25W) in the UV digital printer instantly cures the printed ink. Combined with UV light irradiation, the printed pattern is cured and shaped to obtain a labeling layer containing the pattern.

[0043] The preparation process in this embodiment is as follows:

[0044] S1. Impregnation: The carbon fiber woven fabric is laid flat in the lower mold of the mold, ensuring the fabric is smooth and wrinkle-free. The above-mentioned impregnation resin raw materials are mixed and evenly injected into the fabric surface and the inner cavity of the mold using a dispensing machine, allowing the resin to fully impregnate the fabric. Then the mold is closed, and a vacuum pump is started simultaneously to remove air bubbles. After the resin has completely impregnated the fabric, the board is demolded, resulting in a board material with the fabric covered by the impregnated resin layer. The impregnation temperature is 80℃, and the duration is 45 minutes. During this process, the impregnation resin fully penetrates into the fiber gaps of the carbon fiber woven fabric, completely covering each fiber. At the same time, the resin forms a continuous resin layer on the upper and lower surfaces of the fabric, namely the first impregnated resin layer and the second impregnated resin layer.

[0045] S2. Printing: A logo layer is formed on the upper surface of the board after impregnation using UV inkjet printing. In this embodiment, the logo layer is the company logo. The specific process parameters for UV inkjet printing are as follows:

[0046] UV light band: 365nm

[0047] Print resolution: 1200×1200dpi

[0048] UV light power: 25W

[0049] UV inkjet printing includes a two-stage UV irradiation process: the first UV irradiation involves the first UV lamp moving synchronously with the inkjet printing assembly, causing the ink to solidify instantly under the first UV light irradiation, forming a printed pattern and preventing ink diffusion; the second UV irradiation involves the printed pattern being deeply cured and shaped under the second UV light irradiation, creating a hardness difference between the pattern area and the surrounding resin layer, facilitating subsequent waste removal, and ensuring the wear resistance of the pattern.

[0050] The ink is selected from commercially available flexible UV-curing inks (such as the flexible UV-curing inks from Shenzhen Moku Company) to adapt to the flexibility of the polyurethane resin layer.

[0051] Multiple label layers are printed at equal intervals on the board. The spacing between adjacent label layers can be determined according to the label layer size and cutting allowance (for example, when the label layer size is 30mm×20mm, the adjacent spacing is set to 10mm).

[0052] S3. Cutting: Using one of the marking layers as a positioning reference, the sheet material is clamped and cut. A CCD vision positioning system is used to identify the position of the marking layer and control the cutting tool to cut along the preset cutting line, cutting the sheet material into individual semi-finished sheets with marking layers.

[0053] Each semi-finished sheet contains a complete labeling layer. During cutting, because the carbon fiber woven fabric has been completely penetrated and coated with resin, the fibers at the cut edges are firmly bonded and fixed by the resin, preventing issues such as fraying, loose threads, and rough edges. This embodiment only shows the structure of the semi-finished sheet; the complete finished sheet requires further coating to form a protective layer (see Embodiment 2).

[0054] Example 2 (Finished Sheet - with Protective Layer)

[0055] Based on the semi-finished sheet obtained in Example 1, a dispensing process is further performed to form a protective layer, ultimately yielding the finished sheet. (Refer to...) Figure 2 and Figure 3 As shown, a sheet material finished with a fabric coating further includes a protective layer. This protective layer coats a labeling layer and a resin-impregnated layer. The protective layer is combined with a first resin-impregnated layer to coat the fabric, a second resin-impregnated layer, and the labeling layer. That is, the protective layer, combined with the first resin-impregnated layer, coats the fabric layer, the second resin-impregnated layer, and the labeling layer, forming a fully coated structure. Furthermore, the raw materials for the protective layer are composed of the following components by weight percentage: 97% polyurethane resin, 1.5% defoamer, and 1.5% leveling agent.

[0056] In this embodiment, the preparation process of a sheet covered with fabric further includes the following steps:

[0057] S4. Applying Adhesive: Using a fully automatic dispensing machine, apply a measured amount of adhesive to the surface of the cut semi-finished sheets. First, lay each semi-finished sheet flat, maintaining spacing. The adhesive is a mixture of polyurethane resin, leveling agent, and defoamer (proportioning same as the protective layer material). The fully automatic dispensing machine applies the adhesive evenly along the top and sides of the semi-finished sheets, controlling the adhesive layer thickness to 1-3mm to ensure a clear, crystal-like surface while preventing adhesive overflow and air bubbles. After dispensing, cure at 70℃ for 120 minutes to form a protective layer.

[0058] The protective layer completely covers the upper surface of the second impregnated resin layer (covering the marking layer) and the four sides of the finished sheet, and extends downward to combine with the side edges of the first impregnated resin layer, achieving a fully sealed cover of the fabric, the second impregnated resin layer and the marking layer.

[0059] When using the finished sheet material, it is assembled onto the shoe upper or clothing by heat pressing at a temperature of 165℃ for 10 seconds. After heat pressing, the lower surface of the first resin-impregnated layer fuses and bonds firmly to the shoe upper material.

[0060] The finished sheet obtained in this embodiment has the following structure. Figure 2 and Figure 3 As shown, the identification layer is a schematic diagram of a three-dimensional UV-printed icon, and the protective layer completely covers the identification layer.

[0061] This embodiment uses a process of "impregnation → UV printing → cutting → glue application," requiring only four steps to produce the finished sheet material, making the processing simple. The finished sheet material has good flexibility (Shore hardness A60-70), can be bent 180° without creases, and is suitable for soft parts of shoes, clothing, etc.

[0062] Example 3 (Upgraded Solution – With Optical Film)

[0063] Based on the technical solutions of the above embodiments, this embodiment of a sheet material covered with fabric further includes an optical film 6 between the fabric layer and the impregnated resin layer. The optical film 6 is located between the fabric and the second impregnated resin layer (i.e., above the fabric), as shown in the figure. Figure 4 As shown, the optical film is an optically textured film with micro-nano structures. Its surface has periodic microstructures (such as diffraction gratings, microprism arrays, or holographic patterns), which produce dazzling optical effects through the interference, diffraction, or reflection of light, replacing the traditional electroplating process. The optical film is made of polyethylene terephthalate (PET) or polycarbonate (PC), with a surface hardness of 4H-6H, exhibiting excellent wear resistance.

[0064] The preparation process in this embodiment is as follows:

[0065] S1. Impregnation (with optical film): First, lay the optical film on the bottom of the lower mold (optical side up), then lay the carbon fiber woven fabric (fabric) flat on top of the optical film, ensuring that each layer is flat and wrinkle-free. Then, use a glue dispensing machine to pour the impregnation resin into the mold. The formula of the impregnation resin is the same as in Example 1. After the resin has completely impregnated the carbon fiber woven fabric, close the mold and start the vacuum pump to remove air bubbles. The impregnation temperature is 80°C and the duration is 50 minutes.

[0066] During this process, the impregnating resin penetrates the fiber gaps of the carbon fiber woven fabric, and at the same time, it bonds the optical film to the carbon fiber woven fabric as one. The fiber gaps of the carbon fiber woven fabric are completely filled by the resin, and a continuous first impregnating resin layer (located below the optical film) and a second impregnating resin layer (located above the carbon fiber woven fabric) are formed on the upper and lower surfaces.

[0067] S2. Printing: On the upper surface of the second impregnated resin layer, a marking layer 4 is formed by UV inkjet printing, with the specific process being the same as in Example 1.

[0068] S3. Cutting: Cutting is performed using the marking layer as the positioning reference. The specific process is the same as in Example 1.

[0069] S4. Applying adhesive: Use a fully automatic adhesive dispensing machine to apply a quantitative amount of adhesive to the cut semi-finished sheet. The raw material formula for the adhesive is the same as in Example 2. After the adhesive is cured, a protective layer is formed on the upper surface of the second impregnated resin layer and the marking layer. The protective layer is a transparent polyurethane soft adhesive that does not affect the optical effect of the optical film.

[0070] Optical effect of finished sheet: Since the optical film is located above the fabric, external light shines through the gap of the marking layer, passes through the transparent protective layer and the second impregnated resin layer, and shines on the micro-nano structure of the optical film. After reflection and diffraction, it presents a dazzling metallic luster effect. Different optical effects can be obtained by changing the optical film with different patterns. No electroplating process is required, which is green and environmentally friendly.

[0071] When using the finished sheet material, it is attached to shoe uppers or clothing via heat pressing at a temperature of 170℃ for 12 seconds. The optical film imparts a metallic optical effect to the sheet material, while also exhibiting high surface hardness (4H-6H) and excellent abrasion resistance.

[0072] This embodiment, building upon the achievement of complete fabric coverage and label printing, further endows the sheet with a unique optical decorative effect through an optical film. This can replace traditional electroplating processes, avoid heavy metal pollution, and significantly improve surface abrasion resistance. The structure of the finished sheet in this embodiment before adhesive application is as follows: Figure 4 As shown, the structural diagram after dispensing is not drawn.

[0073] Example 4 (Implementation methods for different fabric materials)

[0074] Based on the technical solution of Embodiment 2, this embodiment uses different fabric materials to verify the universality of the present invention.

[0075] 4.1 Aramid (Kevlar) Fabric

[0076] The fabric is made of all-aramid (Kevlar) woven fabric. Aramid fabric has excellent impact resistance and flame retardant properties, but it also has the problem of fibers scattering when cut.

[0077] In this embodiment, the raw materials for impregnating the resin are formulated according to the following weight percentages: 97% polyurethane resin, 1.0% defoamer, and 2.0% leveling agent (the leveling agent content is increased to 2.0% compared to Example 1 to improve the spreadability of the resin on the aramid fiber surface). The impregnation temperature is 80°C, and the duration is 40 minutes. The remaining steps (UV printing, cutting, and dispensing) are the same as in Example 2. The resulting finished sheet has the golden yellow appearance of aramid fabric and excellent impact resistance. The surface is completely coated with resin, with no fiber unraveling issues, making it suitable for footwear and apparel components requiring high strength and flame retardant properties.

[0078] 4.2 Fiberglass cloth

[0079] The fabric is made of woven fiberglass cloth, which has excellent insulation properties and dimensional stability, and is inexpensive, making it suitable for cost-sensitive products.

[0080] In this embodiment, the impregnation resin is prepared from 97% polyurethane resin, 1.0% defoamer, and 2.0% leveling agent. The impregnation temperature is 80°C, and the duration is 50 minutes. Because the glass fiber diameter is relatively large, a longer impregnation time is required to ensure that the resin fully penetrates into the fiber gaps. The remaining steps are the same as in Example 2. The resulting finished sheet has good dimensional stability and a translucent appearance, suitable for marking and decorative applications.

[0081] 4.3 Mesh Fabric

[0082] The fabric is made of polyester mesh (mesh fabric), which has good breathability and softness, making it suitable for athletic shoe uppers.

[0083] In this embodiment, the resin formulation is the same as in Example 1. Due to the high porosity of the mesh fabric, the resin impregnation speed is fast, and the impregnation time is 30 minutes. After impregnation, the resin fills the mesh of the mesh fabric, forming a continuous and dense sheet. The remaining steps are the same as in Example 2. The resulting finished sheet fabric maintains the texture of the mesh fabric while achieving complete sealing and covering. High-precision markings can be printed on the surface, making it suitable for shoe upper trademarks and decorative parts.

[0084] 4.4 Laser Cloth

[0085] The fabric used is laser-etched fabric (i.e., polyester fabric with a laser holographic effect on the surface). The laser-etched fabric itself has a dazzling reflective effect. In this embodiment, the impregnation resin formulation is the same as in Example 1. The impregnation time is 35 minutes to avoid prolonged impregnation damaging the laser effect layer; the remaining steps are the same as in Example 2. The resulting finished sheet retains the dazzling reflective effect of the laser-etched fabric while the resin coating enhances its structural strength and weather resistance. The printed marking layer on the surface complements the laser effect perfectly.

[0086] 4.5 Carbon fiber woven fabric and aramid (Kevlar) fiber blended fabric

[0087] The fabric is a blend of carbon fiber woven fabric and aramid (Kevlar) fiber, combining the reflective properties of carbon fiber with the high toughness of aramid. In this embodiment, the impregnation resin formulation is the same as in Example 1, the impregnation temperature is 80°C, the impregnation time is 45 minutes, and the remaining steps are the same as in Example 2.

[0088] Example 5 (Comparative Implementation of Different Resin Formulations)

[0089] Based on the technical solution of Example 2, this example uses different impregnation resin formulations to optimize the sheet performance.

[0090] 5.1 High flexibility formula

[0091] The raw materials for impregnating the resin and the protective layer are formulated according to the following weight percentages: 99% polyurethane resin, 0.5% defoamer, and 0.5% leveling agent.

[0092] This formulation has the highest polyurethane resin content, resulting in sheets with optimal flexibility and a Shore A hardness of 55-60, making it suitable for shoe upper parts requiring extremely high flexibility (such as the tongue and upper). Other process parameters are the same as in Example 2.

[0093] 5.2 High Hardness Formula

[0094] The raw materials for impregnating the resin and the protective layer are formulated according to the following weight percentages: 96% polyurethane resin, 2% defoamer, and 2% leveling agent.

[0095] This formula has the highest content of functional additives, resulting in sheets with higher surface hardness and better abrasion resistance, achieving a Shore A hardness of 75-80. It is suitable for areas requiring high abrasion resistance, such as the outer side of shoe soles. The remaining process parameters are the same as in Example 2.

[0096] Comparative Example

[0097] To verify the technical effect of the present invention, the following comparative example (unimpregnated carbon fiber cloth) was set up for comparison.

[0098] Unimpregnated carbon fiber woven fabric was directly cut and glued to the shoe upper material. Results showed that:

[0099] (1) The carbon fiber cloth was severely frayed at the edges during cutting, resulting in a large number of rough edges and scattered carbon fiber filaments;

[0100] (2) The adhesion strength with the shoe upper material is low, and the edges will curl and fall off after 200 bends;

[0101] (3) The hardness is high and does not match the softness of the shoe surface, resulting in obvious creases at the bending points.

[0102] Performance testing

[0103] The finished sheets obtained in Examples 1 to 3 were subjected to the following performance tests, and the results are shown in Table 1.

[0104] Test method:

[0105] Fiber shedding / thread detachment test: After placing the edge of the sheet under standard conditions (temperature 23±2℃, humidity 50±5%) for 24 hours, check the edge for any fibers coming off with a 10x magnifying glass. Then, stick tape to the edge and peel it off, checking for any fibers adhering to the tape.

[0106] Adhesion test (after heat treatment): According to ASTM D4541-22 standard, the bond strength between the sheet and the upper material is tested by the pull-out method under the conditions of 180 degrees and 15-65s.

[0107] Abrasion resistance test of the marking layer: The dry rubbing color fastness is tested according to the method of GB / T3920-2008 "Textiles - Tests for color fastness to rubbing". The gray scale evaluation uses a 5-level card (5 is the best and 1 is the worst).

[0108] Surface hardness test: The test was conducted using a pencil hardness tester in accordance with ASTM D3363 standard.

[0109] Abrasion resistance test: Refer to GB / T21196.2-2007 "Textiles - Martindale method - Determination of abrasion resistance of fabrics - Part 2: Determination of specimen breakage" standard.

[0110] Yellowing resistance test: Refer to HG / T3689-2014 "Test method for yellowing resistance of footwear" standard.

[0111] Aging resistance test: Refer to GB / T3512-2014 standard "Accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber in hot air".

[0112] Damp heat aging test: Refer to GB / T15905-1995 "Damp heat aging test method for vulcanized rubber" standard.

[0113] Table 1. Performance test results of the examples and comparative examples.

[0114] Test Project Example 1 Example 2 Example 3 Comparative Example Thread unraveling / loosening none none none serious <![CDATA[Hot stamping adhesion (kg / cm 2 [[ID=2>)]]> 1.3 1.5 1.5 1B Wear-resistant label layer 2-3 4-5 4-5 - Surface hardness HB HB 4H - Crystal texture Transparent Transparent Transparent none Martindale abrasion resistance (times) - ≥51200 ≥51200 - Yellowing resistance (grade) - ≥4 ≥4 - Aging resistance (grade) - ≥4 ≥4 - Moist heat aging - qualified qualified -

[0115] Note: "—" indicates that the item has not been tested or is not applicable.

[0116] Test Result Analysis:

[0117] Desiccation / Filament Delamination: No desiccation was observed in Examples 1 to 3, demonstrating that complete resin coating of the fibers effectively solves the desiccation problem in fabrics such as carbon fiber cloth. In contrast, the unimpregnated carbon fiber cloth in the comparative examples exhibited severe desiccation.

[0118] Heat adhesion: The heat adhesion of Examples 1 to 3 all reached a high standard, proving that the sheet of the present invention can be firmly attached to the shoe upper material by heat bonding.

[0119] Abrasion resistance of the marking layer: The dry rubbing color fastness of Examples 2 and 3 reached level 4-5 (maximum level 5), proving that the protective layer has an excellent protective effect on the UV-printed marking layer. Example 1 had no protective layer, resulting in poor abrasion resistance of the marking layer; the pattern faded significantly after 500 rubs. The comparative example had no printing layer.

[0120] Surface hardness: In Example 3, due to the addition of an optical film, the surface hardness reaches 4H, which is significantly better than other examples.

[0121] Crystal texture: Examples 1 to 3 all exhibit a transparent crystal texture, while the comparative example is the exposed surface of carbon fiber cloth, which does not have a crystal texture.

[0122] Abrasion resistance test: The sheets of Examples 2 and 3 both achieved more than 51,200 abrasion cycles under a load of 12 kPa. The sheet surface was undamaged and the marking layer was intact, indicating that the sheet of the present invention has excellent abrasion resistance and can meet the durability requirements of footwear and apparel products during daily wear and washing.

[0123] Yellowing resistance test: The finished sheets obtained in Examples 2 and 3 were placed in an ultraviolet aging test chamber, irradiated for 15 hours using a 300W UV lamp at 50°C. After the test, the yellowing level of the sheet surface was evaluated according to the gray scale. The yellowing resistance level of the sheets in Examples 2 and 3 both reached level 4 or above, indicating that the sheet of the present invention has good color stability under light conditions.

[0124] Aging resistance test: The finished sheets obtained in Examples 2 and 3 were placed in a 70°C hot air aging test chamber for 5 days. The results showed that the sheet surface had no cracks, no powdering, and no discoloration, and the grade rating was all above level 4, indicating that the sheet of the present invention has good heat aging resistance.

[0125] Humidity and heat aging test: The finished sheets obtained in Examples 2 and 3 were placed in a constant temperature and humidity test chamber at 70°C and 95% relative humidity for 72 hours. The results showed that the sheet surface did not change color, whiten, bubble, or crack, indicating that the sheet of the present invention has good stability under high temperature and high humidity conditions and can meet the requirements of footwear and apparel products used in humid environments. The comparative example could not be effectively evaluated because the adhesion strength between the unimpregnated carbon fiber cloth and the shoe upper material was extremely low, and it had already fallen off before humidity and heat aging.

[0126] All components involved in this invention are commercially available products. Those skilled in the art can purchase or order them directly from the market according to the required product models and specifications. For example, the polyurethane resin used may be from Wanhua Chemical's WANNATE series or BASF's Elastollan series.

[0127] Defoamers such as BYK-066N (BYK Chemicals) and TEGO Airex 900 (TEGO) are used, while leveling agents such as BYK-333 (BYK Chemicals) and TEGO Glide 450 (TEGO) are used.

[0128] The above description is merely a preferred embodiment of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above embodiments, and that the present invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this invention, based on the technical solutions and inventive concepts of the present invention, should be covered within the protection scope of this invention.

Claims

1. A sheet material covered with fabric, characterized in that, It includes a fabric (2), an impregnated resin layer, a labeling layer (4), and a protective layer (5). The fabric (2) is covered by the impregnated resin layer, and the labeling layer (4) is printed on the impregnated resin layer. The protective layer (5) covers the labeling layer (4) and the impregnated resin layer.

2. The sheet material for covering fabric according to claim 1, characterized in that, The fabric (2) is divided into a first impregnated resin layer (1) and a second impregnated resin layer (3). A marking layer (4) is printed on the second impregnated resin layer (3). A protective layer (5) is combined with the first impregnated resin layer (1) to cover the fabric (2), the second impregnated resin layer (3) and the marking layer (4).

3. A sheet material for covering fabric according to claim 1 or 2, characterized in that, The fabric (2) is at least one of carbon fiber cloth, aramid cloth, fiberglass cloth, mesh cloth, or laser cloth.

4. A sheet of fabric covering according to claim 1 or 2, characterized in that, Both the impregnated resin layer and the protective layer (5) are prepared by mixing the following materials: Polyurethane resin: 96%-99% Defoamer: 0.5%-2% Leveling agent: 0.5%-2% All percentages above are by weight.

5. A sheet of fabric covering according to claim 1 or 2, characterized in that, The identification layer (4) is formed by UV inkjet printing.

6. A sheet of fabric covering according to claim 1 or 2, characterized in that, An optical film (6) is also included between the fabric (2) and the resin impregnation layer.

7. A process for preparing a sheet covered with fabric, characterized in that, Includes the following steps: S1. Impregnation: The fabric (2) is laid flat in the mold, glue is poured in, the mold is closed and vacuum is drawn to obtain a board material covered by the impregnated resin layer. S2. Printing: A marking layer (4) is formed on the board by UV inkjet printing; S3. Cutting: Position the board and cut it into individual semi-finished sheets with marking layer (4); S4. Apply glue: Lay each semi-finished sheet flat and maintain spacing, apply a measured amount of glue to cover the upper surface and sides of the semi-finished sheet to obtain the finished sheet.

8. The process for preparing a sheet of covered fabric according to claim 7, characterized in that, In step S1, a dispensing machine is used for dispensing. The raw material for dispensing is a mixture of polyurethane resin, defoamer, and leveling agent. The wetting temperature is 80°C and the duration is 30-60 minutes.

9. The process for preparing a sheet of fabric-covered material according to claim 7, characterized in that, In step S2, each marking layer (4) is printed at equal intervals. UV light irradiation is maintained during the UV inkjet printing process, and the UV light wavelength is 365-425nm. In step S3, one of the marking layers (4) is used as a positioning reference to clamp and cut the board.

10. The process for preparing a sheet of fabric-covered material according to claim 7, characterized in that, In step S4, a fully automatic dispensing machine is used to apply the adhesive in a measured amount. The raw material for the dispensing is a mixture of polyurethane resin, defoamer, and leveling agent. The curing temperature of the dispensing is 70°C, and the curing time is 120 minutes.

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