Overview of Chunyafang Composite TPU Fabric

Chunyasu composite TPU fabric is an innovative functional textile material, composed of springyasu substrate fabric and thermoplastic polyurethane (TPU) film through a special process. This fabric combines Chunyashi’s excellent mechanical properties and TPU’s excellent waterproof and breathable properties, showing unique advantages in the field of modern functional textiles. According to industry standard test data, the thickness range of the fabric is 0.25-0.4mm, the weight per unit area is about 180-220g/m², and the tensile strength can reach 30-40N/cm.

In terms of structural composition, the Chunsong composite TPU fabric adopts a double-layer composite structure design: the outer layer is a high-density Chunsong fiber fabric, and the inner layer is a TPU film. Among them, the spring-spun base fabric has good wear resistance and tear resistance, while the TPU film provides excellent waterproof and breathable function. The two layers of materials are firmly combined through environmentally friendly adhesives or hot pressing processes to form a complete functional composite fabric system.

The key technical parameters of this fabric include: the waterproof level reaches more than 5000mm, the breathability is maintained at about 3000g/m²/24h, the water pressure resistance exceeds 4000Pa, and it also has excellent flexibility and durability. These characteristics make Chunya-Song composite TPU fabrics ideal for wetsuit manufacturing, providing reliable protection while maintaining comfort. In addition, its unique microstructure imparts excellent antibacterial and mildew-resistant properties to the fabric, which is particularly important for long-term diving equipment.

Analysis of the requirements of diving suits for waterproof performance

As a core component of professional diving equipment, diving suits directly affect the safety and comfort of divers. According to the International Diving Association (IDA), an ideal diving suit must have a waterproof rating of at least 5000mm to ensure that it can effectively block moisture penetration in underwater environments above 5 meters. This requirement not only concerns the diver’s body temperature regulation, but also directly concerns life safety.

From the actual application requirements, the waterproof performance of the diving suit needs to meet multi-level technical indicators. First of all, the basic waterproofness is mainly reflected in the surface tension and contact angle of the fabric. According to Smith & Johnson (2019), the ideal contact angle of the wetsuit fabric should be greater than 120° to ensure continuous waterproofing in an underwater environment. The second is water pressure resistance. The fabric of the diving suit needs to withstand water pressure changes caused by different depths, and usually requires a water pressure resistance of more than 4000Pa. The latter is durability. Since the diving suit often faces harsh environments such as seawater corrosion and ultraviolet radiation, its waterproof performance needs to be good stability and can still maintain its original performance after more than 50 standard washings.

In specificIn application scenarios, different types of diving activities have different requirements for waterproof performance. Recreational diving usually requires the fabric to have basic waterproofing capabilities, while professional diving and military diving require higher standards of waterproofing performance. For example, military diving suits require that the fabric can withstand waterproof pressure of more than 10,000mm and have additional functions such as anti-oil and anti-salt spray corrosion. In addition, with the development of deep diving technology, the new diving suit also needs to consider the problem of maintaining waterproof performance under extreme pressure conditions.

To meet these strict requirements, modern diving suit fabrics generally adopt multi-layer composite structural design. In addition to the basic waterproof layer, functional structures such as anti-wear layer and thermal insulation layer will also be added to improve overall protective performance. This design concept not only improves waterproofing, but also takes into account comfort and durability, allowing the diving suit to adapt to more complex usage environments.

The waterproofing mechanism and optimization strategy of Chunyafang composite TPU fabric

The waterproof performance of Chunyashi composite TPU fabric is mainly achieved through its unique microstructure and chemical characteristics. According to the study of Matsuda et al. (2020), the molecular chain structure of the TPU film presents a highly ordered arrangement, forming a dense continuous phase, which is the basis for its excellent waterproofing performance. Specifically, the surface free energy of the TPU film is low, resulting in a clear spherical shape on its surface, with a contact angle of more than 125° (Table 1). This superhydrophobic property effectively prevents moisture penetration.

To further optimize waterproofing performance, researchers have developed a variety of modification techniques. Brown & Taylor (2021) proposed a surface nanocoating treatment process, by introducing fluorinated silane compounds on the surface of TPU films, the contact angle can be increased to above 140°. This technology significantly enhances the waterproofing ability of the fabric while maintaining good breathability. In addition, by adjusting the molecular weight and crosslinking degree of the TPU, the pore size and distribution of the film can be controlled, thereby achieving better waterproofing.

InAt the composite structure level, the interface bonding quality between the spring spun substrate fabric and the TPU film directly affects the waterproof performance. Wang et al. (2022)’s research shows that the use of plasma pretreatment technology can significantly improve the bond strength of the two and reduce the possibility of moisture leakage. Specific experimental data show that the water pressure resistance value of composite fabrics after plasma treatment can be increased by about 30% (Table 2).

It is worth noting that temperature changes also have an important impact on waterproofing performance. Lee & Park (2023) found that when the ambient temperature drops below 5°C, the glass transition of the TPU film may cause local microcracks to occur, which affects the waterproofing effect. To this end, they recommend adding a proper amount of plasticizer to the formula to improve flexibility under low temperature conditions. The experimental results show that the optimized fabric can maintain stable waterproof performance even under -10°C.

In addition, the sewing process of the fabric will also affect the overall waterproofing effect. Traditional needle seam technology is prone to cause needle hole leakage, so modern diving suit production generally adopts high-frequency welding technology. Johnson & Smith (2022) comparative study shows that the waterproof performance of joints using ultrasonic welding is about 50% higher than that of traditional needle joints. This process not only eliminates the hidden danger of pinholes, but also improves the mechanical strength at the joints.

The thermal insulation performance characteristics of Chunyafang composite TPU fabric

The thermal insulation performance of Chunyafang composite TPU fabric is mainly due to its unique multi-layer structural design and material characteristics. According to Thompson & Davis (2021), the thermal insulation performance of this fabric can be quantified and evaluated by thermal resistance value (R-value). Standard test data shows that the thermal resistance value of single-layer spring-song composite TPU fabric is about 0.03m²·K/W, while through multi-layer superposition design, its thermal insulation performance can be improved to above 0.12m²·K/W.

At the microstructure level, there are a large number of tiny pores inside the TPU film, which form an effective thermal insulation barrier. Harris et al. (2022) Through scanning electron microscopy, it was found that the diameter of these pores is between 1-5 μm, forming a dense closed network structure. This structure not only reduces the heat conduction path, but also effectively blocks the occurrence of thermal convection. Table 3 shows the influence of different pore densities on insulation performance:

In order to further improve the insulation effect, modern production processes generally adopt gradient structure design. Wilson & Chen (2023) proposed a “sandwich” structural scheme: add a low thermal conductivity air capture layer between the outer spring sub-spinned fabric and the inner TPU film. This design not only increases the overall thickness of the fabric, but more importantly, it forms multiple independent air compartments, which significantly improves the warmth performance. Experimental results show that the fabric using this structure can extend the body temperature holding time to more than 90 minutes at an environment of -5°C.

In practical applications, the impact of humidity conditions on thermal insulation performance cannot be ignored. According to Anderson & Lee (2022), when the moisture content of fabric exceeds 5%, its thermal resistance value will drop by about 20%. To solve this problem, researchers have developed a new moisture-absorbing and sweating finishing technology. By introducing hydrophilic groups on the surface of the TPU film, moisture transmission can be accelerated and the fabric can be kept dry. Table 4 lists the comparison of the effects of different sorting methods:

In addition, the color choice of fabric will also affect the insulation performance. Blackwell & Thompson (2021) research shows that dark fabrics can absorb more heat under direct sunlight, but also speed up the heat loss rate. In contrast, light-colored fabrics can maintain a constant temperature better, although they absorb heat slowly. Therefore, when designing diving suits, you need to comprehensively consider the use environment and activity characteristics and reasonably choose the fabric color.

Application cases of Chunyafang composite TPU fabric in diving suits

The application of Chunyafang composite TPU fabric in the field of diving suits has achieved remarkable results, especially in professional diving and extreme sports equipment. According to IDSA’s 2022 market research report, more than 60% of professional diving suit manufacturers around the world have adopted this new fabric. Taking AquaTech, a well-known American diving brand, as an example, its flagship product, DeepDive series, fully adopts three-layer structure Chunyayi composite TPU fabric, achieving waterproofing level of more than 5000mm and breathable performance of 4000g/m²/24h.

Table 5 shows several typical application cases and their performance:

In practical applications, the OceanPro X-Series diving suit selected by the German Navy Special Forces performed well. This product uses a specialRice coating treatment technology makes it more resistant to oil and salt spray. Experiments have proved that even in 10 consecutive high-intensity diving tasks, the fabric can still maintain more than 95% waterproof performance. In addition, the BlueWave Pro series diving suits adopted by the Hokkaido Marine Research Center in Japan show excellent insulation effect in extremely cold waters (-5°C). The user reported that the body temperature retention time was about 30% longer than that of traditional diving suits. .

It is worth noting that some high-end customized diving suits have also introduced intelligent temperature control systems, which are combined with Chunyafang composite TPU fabric. For example, the IntelliDive series launched by British brand DeepSea Innovations uses embedded sensors to monitor water temperature and human body core temperature in real time, and automatically adjust the breathability of the fabric to ensure good comfort. This intelligent design greatly improves the functionality of the diving suit, especially for diving tasks in long or complex environments.

References

1. Matsuda, T., et al. (2020). “Surface Modification of TPU Films for Enhanced Hydrophobicity.” Journal of Applied Polymer Science, 137(12), pp. 48212.

2. Brown, R., & Taylor, J. (2021). “Fluorosilane Coating on TPU: A Novel Approach to Improve Water Resistance.” Materials Science and Engineering, 125(3), pp. 234-245.

3. Wang, L., et al. (2022). “Plasma Treatment Effects on Adhesion Properties of Composite Fabrics.” Textile Research Journal, 92(5), pp. 1023-1034.

4. Lee, S., & Park, J. (2023). “Low Temperature Performance of TPU-Based Waterproof Fabrics.” Polymer Testing, 107, pp. 107205.

5. Johnson, M., & Smith, P. (2022). “Comparison of Seaming Techniques in Waterproof Garments.” International Journal of Clothing Science and Technology, 34(2), pp. 156-167.

6. Thompson, K., & Davis, R. (2021). “Thermal Insulation Properties of Multi-Layered Textiles.” Thermal Science and Engineering Progress, 22, pp. 100823.

7. Harris, C., et al. (2022). “Microstructure Analysis of TPU Films for Thermal Applications.” Microscopy and Microanalysis, 28(S1), pp. 152-159.

8. Wilson, G., & Chen, Y. (2023). “Gradient Structure Design for Enhanced Thermal Protection.” Advanced Functional Materials, 33(12), pp. 2209876.

9. Anderson, T., & Lee, H. (2022). “Moisture Management in High-Performance Fabrics.” Textile Bioengineering and Informatics, 14(3), pp. 189-201.

10. Blackwell, J., & Thompson,A. (2021). “Color Influence on Thermal Performance of Outdoor Wear.” Coloration Technology, 137(2), pp. 105-112.

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