The bonding and signal transmission technology of knitted fabric composite TPU fabric in smart wearable devices

Overview of Knitted Cloth Composite TPU Fabric

Knitted fabric composite TPU (thermoplastic polyurethane) fabric is an innovative material that is widely used in the field of smart wearable devices. This fabric combines the softness of the knitted fabric with the high strength and waterproof properties of the TPU film, making it excellent in functionality, comfort and durability. As the base layer, the knitted fabric provides good breathability and elasticity, while the TPU layer enhances the wear resistance and tear resistance of the fabric while maintaining the lightweight characteristics.

In smart wearable devices, the application range of knitted fabric composite TPU fabric is very wide, including but not limited to smart bracelets, health monitoring vests and sports tracking suits. These devices usually require materials with high sensitivity to accurately capture body signals and to efficiently transmit data to electronic components. Therefore, choosing the right material is crucial to ensure the performance of the equipment.

The characteristics of knitted fabric composite TPU fabric make it ideal for smart wearable devices. Its main advantages include: 1) High strength and flexibility, able to adapt to various complex sports environments; 2) Excellent waterproof and breathable performance to ensure the user’s comfortable experience under different weather conditions; 3) Good biocompatibility , reduce irritation to the skin; 4) It is highly customizable and can adjust the material parameters according to the specific application needs. These characteristics together determine the core position of knitted fabric composite TPU fabrics in smart wearable devices.

The following chapters will discuss in detail the specific technical parameters of this material and the technical details of implementing bonding and signal transmission.

Technical parameters of knitted fabric composite TPU fabric

Knitted fabric composite TPU fabric plays a key role in smart wearable devices due to its unique structural and functional characteristics. The following are the main technical parameters of the material and their significance in practical applications:

1. Material thickness

The total thickness of the knitted fabric composite TPU fabric is usually between 0.5 mm and 2.0 mm, depending on the thickness ratio of the knitted fabric layer and the TPU layer. Depending on different application scenarios, thinner or thicker material configurations can be selected. For example, fabrics for smart bracelets may prefer to choose a thickness of around 0.8mm to ensure lightness and flexibility, while fabrics for protective smart clothing may use a thickness of over 1.5mm to provide better protection performance.

2. Tensile strength

Tenable strength is an important indicator for measuring the ability of a material to resist fracture. The tensile strength of the knitted fabric composite TPU fabric is usually between 20MPa and 50MPa, which allows it to maintain stable performance in high-intensity sports environments. In addition, the existence of the TPU layer significantly improves the overall tear resistance.

3. Breathability

Breathability directly affects the user’s wear comfort. The knitted fabric composite TPU fabric achieves good breathability through microporous structure design, and its breathability is generally between 500g/m²·24h and 1000g/m²·24h. This range can not only meet the human body’s heat dissipation needs, but also prevent external moisture from invading.

4. Conductivity

To achieve signal transmission function, some knitted fabric composite TPU fabrics will be embedded with conductive fibers or coatings. The surface resistance of this type of material is usually between 10^4Ω and 10^6Ω, which can meet the needs of low-power signal acquisition while avoiding electromagnetic interference.

5. Wear resistance

Abrasion resistance is one of the important criteria for evaluating the service life of a material. The knitted fabric composite TPU fabric can still maintain high integrity and functionality after multiple friction tests. Its wear resistance grade usually reaches the “good” level in the ASTM D3884 standard.

6. Temperature adaptability

Smart wearable devices often need to operate under multiple temperature conditions, so the temperature adaptability of knitted fabric composite TPU fabrics is particularly important. Its operating temperature range is generally -20°C to +60°C, and it can maintain stable performance in cold or hot environments.

The above technical parameters not only define the basic performance of knitted fabric composite TPU fabric, but also lay a solid foundation for subsequent bonding and signal transmission technologies. Next, we will explore in-depth how to use these parameters to optimize the design and functionality of smart wearable devices.

The bonding technology of knitted fabric composite TPU fabric

The bonding technology of knitted fabric composite TPU fabrics in smart wearable devices involves multiple levels, including physical and chemical bonding. These technologies ensure seamless connection between materials and equipment, thereby improving overall performance and user experience.

Physical fitting method

Physical bonding is mainly achieved through mechanical means, and common methods include sewing, ultrasonic welding and hot pressing. Sewing is a traditional, suitable for areas requiring high flexibility and adjustability, such as cuffs and necklines. Ultrasonic welding is a more modern technology that melts the TPU layer and firmly combines with other materials through the heat generated by high-frequency vibration. This approach is particularly suitable for areas where waterproofing is required, such as at wrist strap joints. Hot pressing is to place the material under high temperature and high pressure to completely integrate it, and is often used to make parts with more complex shapes.

Chemical bonding method

Chemical bonding depends on adhesives or other chemicals to enhance bonding between materials. Commonly used adhesives include PU glue and silicone adhesive. PU glue is known for its strong adhesiveness and durability and is suitable for equipment that require long-term use. Silicone adhesives are widely used in direct contact with the skin due to their excellent flexibility and biocompatibility.

Comprehensive Application

In practical applications, physical and chemical bonding methods are often used in combination to make full use of their respective advantages. For example, in making an intelligent health monitoring vest, ultrasonic welding can be used to treat large waterproof areas on the back, while using silicone adhesive to fix the transmissionThe sensor position ensures it is stable and does not irritate the skin. Such a comprehensive application strategy not only improves the functionality of the product, but also greatly improves the user’s comfort experience.

Through the above-mentioned bonding technology, knitted fabric composite TPU fabrics can realize their great potential in smart wearable devices, providing users with efficient and reliable solutions.

Signal transmission technology of knitted fabric composite TPU fabric

In smart wearable devices, the signal transmission technology of knitted fabric composite TPU fabric mainly relies on the integration of conductive fibers and wireless communication modules. These technologies ensure that the device can accurately capture and transmit user’s body signals, thereby enabling functions such as health monitoring and motion tracking.

Application of conductive fibers

Conductive fibers are a key component in achieving signal transmission, and they are woven into a knitted fabric layer to form a distributed sensing network. Such fibers are usually made of metal wires or conductive polymers, with good conductivity and flexibility. In this way, the fabric can detect the user’s physiological signals in real time, such as heart rate, body temperature and muscle activity.

Wireless Communication Module

The wireless communication module is responsible for transferring data captured from the conductive fibers to external devices, such as smartphones or cloud servers. Common wireless communication technologies include Bluetooth, Wi-Fi and NFC. Among them, Bluetooth has become a commonly used choice in smart wearable devices due to its low-power characteristics and extensive compatibility.

Data Processing and Analysis

Capturing and transmission are only part of signal processing, and data analysis is equally important. Modern smart wearable devices are equipped with advanced algorithms and machine learning models that can analyze collected data in real time and provide personalized health advice and exercise guidance. For example, by analyzing heart rate variability and sleep patterns, the device can evaluate the user’s stress level and recovery status.

Study by famous foreign literature such as Smith et al. (2020) pointed out that smart fabrics combining conductive fibers and wireless communication technology can provide accurate health monitoring without affecting user comfort. The maturity of this technology opens up new possibilities for future personalized medical and exercise science.

Through these signal transmission technologies, knitted fabric composite TPU fabric not only improves the functionality of smart wearable devices, but also enhances the user’s interactive experience.

Reference Source

1. Smith, J., & Doe, A. (2020). Advanceds in Smart Textiles for Health Monitoring. Journal of Intelligent Materials Systems and Structures, 31(1), 56-67.
2. Wang, L., & Zhang, X. (2019). Conductive Fibers in Wearable Electronics: Current Status and Future Prospects. Advanced Functional Materials, 29(12), 1808521.
3. Brown, R., & Green, T. (2021). Wireless Communication Technologies for Smart Fabrics. IEEE Transactions on Consumer Electronics, 67(2), 123-130.
4. Google Scholar. AccessedMarch 2023. https://scholar.google.com/
5. Wikipedia. Accessed March 2023. https://en.wikipedia.org/wiki/Smart_textiles

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