Composite device of high-breathable PTFE nanofiber waterproof and moisture-permeable fabric

Abstract

The application relates to a high-breathability PTFE nanofiber waterproof and moisture-permeable fabric composite system which sequentially comprises a PTFE film unwinding device, a gluing device, a pre-pressing device, a hot laminating device, a moisture curing device and a winding device which are connected in sequence; further comprises a glue storage and conveying assembly which is used for conveying the stored PUR hot melt adhesive to the gluing device and controlling the gluing amount through the gluing device; and further comprises a spraying device which is used for adjusting the humidity environment in the moisture curing device. Compared with the prior art, the application can realize the uniform controllability of the fabric thickness, avoid resource waste, save the cost, ensure the constant tension and the flatness of the cloth winding, and improve the moisture curing rate of the PUR hot melt adhesive.

Description

Technical Field

[0001] This invention relates to a fabric composite device, and more particularly to a composite device for a highly breathable PTFE nanofiber waterproof and moisture-wicking fabric. Background Technology

[0002] With the development of society and the economy, coating and laminating machines are being used more and more widely. A PUR hot melt adhesive laminating machine is a device that heats and melts PUR, a fusible polymer that is solid at room temperature, transforming it into a liquid adhesive with high fluidity and a certain viscosity. This device coats the PUR hot melt adhesive onto a substrate and then laminates it together with another substrate. Composite fabrics are a new type of material made by bonding one or more layers of textile materials, non-woven materials, and other functional materials. Among them, PTFE membrane is a thin film material made of polytetrafluoroethylene (PTFE). It has high tensile strength, chemical corrosion resistance, and high-temperature resistance, therefore PTFE membrane is often used in various fields.

[0003] The curing process of PUR hot melt adhesive consists of two stages: cooling and solidification, and moisture curing. In the first stage, like ordinary thermoplastic hot melt adhesives, the adhesive is heated and melted, applied to the substrate, and then cooled and solidified to develop initial tack strength. In the moisture curing stage, the PUR hot melt adhesive undergoes a chain extension reaction with moisture in the air, forming a rigid polyurethane molecular chain structure, thus giving it high adhesive strength and good chemical resistance, heat resistance, and hydrolysis resistance. However, current PUR hot melt adhesive laminating machines often experience problems during the application process, such as difficulty in controlling the amount of adhesive used, excessive adhesive usage, and excess adhesive dripping from the rollers onto the base during lamination. Furthermore, the curing stage typically uses an oven-drying method, requiring strict control of the melting temperature and drying time, resulting in high energy consumption and low production efficiency.

[0004] Because the tensions of the two fabrics being laminated differ, when the PTFE membrane is fed into the heating and laminating mechanism along with the fabric, uneven and misaligned fabric bonding occurs, affecting the quality of the laminated fabric. Simultaneously, the fabric and PTFE membrane are difficult to stretch synchronously during traction, making them prone to misalignment during the rolling process, resulting in wrinkles, bubbles, and uneven coverage after lamination. These problems lead to wrinkles and other defects in the laminated fabric, failing to meet production requirements.

[0005] Therefore, there is an urgent need to develop a composite device for the continuous and efficient production of highly breathable PTFE nanofiber waterproof and breathable fabrics. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art by providing a composite device for a highly breathable PTFE nanofiber waterproof and breathable fabric. This device can achieve uniform and controllable fabric thickness, avoid resource waste, save costs, ensure constant tension and flatness of the fabric during subsequent winding, and improve the moisture curing rate of PUR hot melt adhesive.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] This invention provides a composite system for a highly breathable PTFE nanofiber waterproof and moisture-permeable fabric, comprising, in sequence, a PTFE membrane unwinding device, an adhesive coating device, a pre-compression device, a heat bonding device, a moisture curing device, and a winding device for material connection.

[0009] It also includes a glue storage-feeding assembly, which is used to deliver the stored PUR hot melt glue to the coating device and control the amount of glue applied through the coating device;

[0010] It also includes a spraying device for regulating the humidity environment in the moisture curing device.

[0011] Furthermore, the composite system of the PTFE nanofiber waterproof and breathable fabric also includes a tension stretching device located between the pre-compression device and the heat bonding device, and between the heat bonding device and the moisture curing device, the tension stretching device being used for tension adjustment of the fabric.

[0012] Furthermore, the glue storage-dispensing assembly includes a pressurizing device, a glue storage device, and a metering pump connected in sequence, and also includes a heating jacket disposed on the glue storage device.

[0013] Furthermore, the pressurizing device is used to provide conveying power;

[0014] The adhesive storage device is used to store PUR hot melt adhesive;

[0015] The input end of the metering pump is connected to the heating jacket via a pipeline, and the output end of the metering pump is connected to the glue application device.

[0016] Furthermore, the adhesive applicator is provided with a support plate and an adhesive dispensing roller located above the support plate;

[0017] The gap between the fabric self-support plate and the glue roller is passed through.

[0018] Furthermore, a heatable scraper is provided above the dispensing roller, and the distance between the heatable scraper and the dispensing roller is 0.5 to 10 mm;

[0019] The heatable scraper is equipped with an electric heater.

[0020] Furthermore, the heatable scraper is provided with multiple suction holes, and the heatable scraper has an adsorption chamber inside. All of the suction holes are simultaneously connected to the adsorption chamber, and the adsorption chamber is connected to an external vacuum suction device through a pipeline. The purpose is to: on the one hand, scrape off excess glue to achieve precise glue application; on the other hand, recover excess glue for reuse, thus saving resources.

[0021] Furthermore, the pre-pressing device is an adjustable roller pressing structure, which achieves pressure adjustment of the fabric through indirect adjustment between two pressure rollers. The pressure of the pre-pressing device is 0.5 to 1 MPa.

[0022] Furthermore, the heat bonding device is a roller assembly with an electric heater, the temperature of the heat bonding device is 120-180°C, and the heat bonding pressure is 0.1-0.4 MPa.

[0023] Furthermore, the moisture curing device includes a moisture curing device body and a spraying device disposed in the moisture curing device body. The bottom of the spraying device is connected to a spraying plate and an atomizer. The spraying plate is provided with a plurality of spraying holes, which are evenly arranged along the length and width of the spraying plate, thereby increasing the contact area between moisture and fabric and improving the moisture curing rate.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention provides a composite device for high-breathable PTFE waterproof and breathable fabric. The design of the heating negative pressure adsorption scraper above the glue roller allows for precise control of the glue application amount through spacing adjustment, which is beneficial to achieve uniform and controllable fabric thickness and avoids resource waste and saves costs.

[0026] (2) The present invention provides a composite device for a high-breathable PTFE waterproof and breathable fabric. The design of the tension stretching device is equipped with a highly sensitive and high-precision flexible sensor to ensure constant tension and flatness of the fabric during subsequent winding, thus meeting the production needs of enterprises.

[0027] (3) The present invention provides a composite device for high-breathable PTFE waterproof and breathable fabric. The device is designed with atomizing tube and atomizer in the moisture curing device, and can control humidity with high precision, thereby improving the moisture curing rate of PUR hot melt adhesive. It has low energy consumption and high production efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a composite device for a highly breathable PTFE waterproof and moisture-wicking fabric according to the present invention.

[0029] Figure 2 This is a schematic diagram of a heatable negative pressure adsorption scraper for a composite device of highly breathable PTFE waterproof and moisture-wicking fabric according to the present invention.

[0030] Explanation of markings in the diagram:

[0031] 1-Pressure device, 2-Glue storage device, 3-Heating jacket, 4-Metering pump, 5-Conduit, 6-PTFE membrane unwinding device, 7-Fabric unwinding device, 8-Glue coating device, 9-Support plate, 10-Glue dispensing roller, 11-Pre-compression device, 12-Tension stretching device, 13-Heating bonding device, 14-Flexible sensor, 15-Moisture curing device, 16-Humidity sensor, 17-Spraying device, 18-Spray plate, 19-Suction device, 20-Rewinding device. Detailed Implementation

[0032] To ensure safe, continuous, and efficient production of the fabric lamination device, this invention provides a lamination device for highly breathable PTFE waterproof and moisture-permeable fabrics, as detailed below. Figure 1 As shown, it includes:

[0033] Pressurization device 1;

[0034] The glue storage device 2 is connected to the pressurizing device 1;

[0035] A glue application device 8 is connected to the glue storage device 2 via a conduit 5;

[0036] A heat bonding device 13 is connected to the glue application device 8 via a pre-pressing device 11 and a tension stretching device 12;

[0037] And a moisture curing device 15 connected to the heat bonding device 13 via a tension stretching device 12.

[0038] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the pressurizing device 1 controls the pressurization pressure of PUR hot melt adhesive to 1-5 MPa. The adhesive storage device 2 is wrapped with a heating jacket 3, which can adjust the temperature inside the adhesive storage device 2 to 110-130°C. The PUR hot melt adhesive in the adhesive storage device 2 can be transported through the conduit 5, and the temperature inside the conduit 5 is consistent with the temperature of the adhesive storage device 2. The purpose is to transport the melted and liquid adhesive to the dispensing roller 10 for coating the substrate through pressurization and temperature control.

[0039] In some specific embodiments, the metering pump 4 is used to control the amount of adhesive applied, with a pressure range of 0 to 20 MPa and a flow rate range of 0.1 to 10 L / min.

[0040] For some specific implementation methods, please refer to Figure 2 As shown, a heatable scraper is provided above the dispensing roller 10. The distance between the scraper and the dispensing roller 10 is 0.5 to 10 mm, and the scraper has a negative pressure adsorption function. The purpose is to scrape off the excess PUR hot melt adhesive and store it for reuse, so as to ensure that the amount of adhesive applied is uniform and controllable.

[0041] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the PTFE film unwinding device 6, the fabric unwinding device 7, and the winding device 19 each include a winding and unwinding frame, two rotating rollers for supporting and pushing the roll of material to roll, a winding and unwinding motor mounted on the winding and unwinding frame, and two rotating rollers arranged side by side and rotating close to each other on the winding and unwinding frame. The output end of the winding and unwinding motor drives and connects to one of the rotating rollers, and the two rotating rollers are connected by a synchronous belt pulley transmission mechanism.

[0042] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the pre-pressing device 11 is equipped with a pressure adjustment mechanism, with a pressure of 0.5 to 1 MPa, which is intended to initially adhere to the fabric.

[0043] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the temperature of the heat bonding device 13 is 120-180℃, the heat bonding pressure is 0.1-0.4 MPa, and the total length is 1-2 m.

[0044] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the heat bonding device 13 is equipped with a highly sensitive and precise flexible sensor 14, and symmetrical tension stretching devices 12 are provided at the front and rear. The tension is tested and fed back to the tension control device to ensure constant tension.

[0045] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the moisture curing device 15 is equipped with a spray device 17. The bottom of the spray device 17 is connected to a spray plate 18 and an atomizer. The spray plate 18 is provided with a plurality of spray holes, which are evenly arranged along the length and width of the spray plate 18. The purpose is to increase the contact area between the moisture and the fabric and improve the moisture curing rate.

[0046] In some specific embodiments, the moisture curing device 15 is equipped with a humidity sensor 16 to provide feedback and intelligently regulate the spray volume, maintaining the humidity inside the device at 80% to 100%.

[0047] In the following embodiments or examples, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0048] The above embodiments will be described in more detail below with reference to specific examples. The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly stated in this technical solution are considered to be common technical features disclosed in the prior art.

[0049] It should be emphasized that any device or component not explicitly described in this invention can be considered as conventional in the art and commercially available.

[0050] Example 1:

[0051] This embodiment provides a composite device for producing a highly breathable PTFE waterproof and moisture-permeable fabric, including a feeding device, an adhesive coating device, a heat bonding device, and a moisture curing device. The entire device is as follows: Figure 1 As shown. Specifically includes:

[0052] Pressurization device 1;

[0053] The glue storage device 2 is connected to the pressurizing device 1;

[0054] A glue application device 8 is connected to the glue storage device 2 via a conduit 5;

[0055] A heat bonding device 13 is connected to the glue application device 8 via a pre-pressing device 11 and a tension stretching device 12;

[0056] And a moisture curing device 15 connected to the heat bonding device 13 via a tension stretching device 12.

[0057] The feeding device is equipped with a pressurizing device 1 to control the pressurization pressure of PUR hot melt adhesive to 3 MPa. The adhesive storage device 2 is wrapped with a heating jacket 3, and the temperature inside the adhesive storage device 2 can be adjusted to 120℃. The metering pump 4 is set to a pressure of 2 MPa and a flow rate of 5 L / min, which is delivered through the conduit 5 and the temperature is controlled at 120℃.

[0058] The PTFE film unwinding device, fabric unwinding device, and winding device all include a winding and unwinding frame, two rotating rollers for supporting and pushing the roll to roll, a winding and unwinding motor mounted on the winding and unwinding frame, and two rotating rollers arranged side by side and close to each other on the winding and unwinding frame. The output end of the winding and unwinding motor drives and connects to one of the rotating rollers, and the two rotating rollers are connected by a synchronous belt pulley transmission mechanism.

[0059] The adhesive applicator 8 is equipped with a dispensing roller 10, and a heatable negative pressure adsorption scraper is provided above the dispensing roller 10. The distance between the scraper and the dispensing roller 10 is 4mm.

[0060] The heat bonding device 13 operates at a temperature of 120℃, a heat bonding pressure of 0.2 MPa, and a total length of 1 m. The heat bonding device 13 is equipped with symmetrical tension stretching devices 12 and highly sensitive, high-precision flexible sensors 14 at its front and rear.

[0061] The moisture curing device 15 is equipped with a spray device 17. The bottom of the spray device 17 is connected to a spray plate 18 and an atomizer. The spray plate 18 is provided with a plurality of spray holes, which are evenly arranged along the length and width of the spray plate 18. The moisture curing device 15 is equipped with a humidity sensor 16 to provide feedback and intelligently regulate the spray volume, maintaining the humidity inside the device at 80%.

[0062] Application Example 1

[0063] The specific process for preparing highly breathable PTFE waterproof and moisture-permeable composite fabric using the apparatus of Example 1 is as follows:

[0064] The pressure of the pressurizing device 1 is set to 3 MPa, and the temperature of the heating jacket 3 is set to 120℃. PUR hot melt adhesive with a viscosity of 3000–4000 mPa·s is conveyed through the conduit 5 via the metering pump 4 at a pressure of 2 MPa and a flow rate of 5 L / min. The adhesive is then sprayed onto the dispensing roller 10, where a heated scraper removes it, and excess adhesive is absorbed by negative pressure. The dispensing roller 10 rotates to evenly apply the PUR hot melt adhesive onto the PTFE film unwound from the unwinding device 6, ensuring uniform coating and improving product quality. After the PTFE film from the dispensing device and the fabric unwound from the fabric unwinding device 7 are bonded together by the pre-compression device 11 with a pressure of 0.5 MPa, they enter the heating and bonding device 13 with a total length of 1.5 m, a temperature of 130°C, and a pressure of 0.3 MPa under the action of the tension stretching device 12 for hot pressing bonding. After the PUR hot melt adhesive reacts with water mist in the moisture curing device 15, it is cured to obtain a highly breathable PTFE waterproof and moisture-permeable composite fabric, which is then wound up on the winding device 20.

[0065] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A composite system of highly breathable PTFE nanofiber waterproof and moisture-wicking fabric, characterized in that, The assembly includes, in sequence, a PTFE film unwinding device (6), an adhesive coating device (8), a pre-pressing device (11), a heat-bonding device (13), a moisture-curing device (15), and a winding device (20); it also includes an adhesive storage-feeding assembly, which is used to transport the stored PUR hot melt adhesive to the adhesive coating device (8); the adhesive coating device (8) includes a support plate (9) and a dispensing roller (10) located above the support plate (9), through which the fabric passes. A heatable scraper is provided above the dispensing roller (10), the distance between the heatable scraper and the dispensing roller (10) is adjustable, and an electric heater is provided on the heatable scraper; the heatable scraper is also provided with multiple suction holes, each containing an adsorption chamber. The suction holes are all connected to the adsorption chamber, and the adsorption chamber is connected to an external vacuum suction device through a pipeline to scrape off excess adhesive and recycle it; tension stretching devices (12) are respectively provided between the pre-pressing device (11) and the heat bonding device (13), and between the heat bonding device (13) and the moisture curing device (15) for adjusting the tension of the fabric; the moisture curing device (15) includes a spraying device (17), which is used to adjust the humidity environment in the moisture curing device (15); the spraying device (17) includes a spray plate (18) and an atomizer, and the spray plate (18) is provided with a number of spray holes, which are evenly arranged along the length and width of the spray plate (18) to increase the contact area between the moisture and the fabric.

2. The composite system of a highly breathable PTFE nanofiber waterproof and breathable fabric according to claim 1, characterized in that, The glue storage-dispensing assembly includes a pressurizing device (1), a glue storage device (2), and a metering pump (4) connected in sequence. The glue storage device (2) is equipped with a heating jacket (3).

3. The composite system of a highly breathable PTFE nanofiber waterproof and moisture-wicking fabric according to claim 2, characterized in that, The pressurizing device (1) is used to provide conveying power; the glue storage device (2) is used to store PUR hot melt glue; the input end of the metering pump (4) is connected to the heating jacket (3) through a pipeline, and the output end of the metering pump (4) is connected to the glue application device (8).

4. The composite system of a highly breathable PTFE nanofiber waterproof and breathable fabric according to claim 1, characterized in that, The distance between the heatable scraper and the dispensing roller (10) is 0.5 to 10 mm.

5. The composite system of a highly breathable PTFE nanofiber waterproof and moisture-wicking fabric according to claim 1, characterized in that, The pre-pressing device (11) is an adjustable roller pressing structure with a pressure of 0.5 to 1 MPa.

6. The composite system of a highly breathable PTFE nanofiber waterproof and moisture-wicking fabric according to claim 1, characterized in that, The heat bonding device (13) is a roller assembly with an electric heater, the temperature of which is 120 to 180 degrees Celsius and the heat bonding pressure is 0.1 to 0.4 MPa.

7. The composite system of a highly breathable PTFE nanofiber waterproof and moisture-wicking fabric according to claim 1, characterized in that, The moisture curing device (15) also includes a humidity sensor (16) for feedback control of the spray volume to maintain the humidity environment inside the device.

8. The composite system of a highly breathable PTFE nanofiber waterproof and moisture-wicking fabric according to claim 1, characterized in that, The tension stretching device (12) is equipped with a highly sensitive and precise flexible sensor (14) to detect the tension fluctuation of the fabric in real time.

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