Definition and background of knitted fabric composite TPU fabric
Knitted fabric composite TPU (Thermoplastic Polyurethane) fabric is an innovative material that is widely used in the field of modern shoe materials. This material combines the softness of the knitted fabric with the high strength properties of the TPU film, making it excellent in breathable and sweat-free and supportive properties. The knitted fabric itself has good elasticity and breathability, while the TPU is known for its excellent wear resistance and water resistance. After the combination of the two, it not only improves the overall performance of the material, but also meets the needs of comfort and durability of various shoes such as sports shoes and casual shoes.
As global consumers’ attention to health and exercise increases, the demand for functional shoe materials has also increased. According to data from international market research institutions, the global functional shoe market size reached US$XX billion in 2022 and is expected to continue to grow at a rate of X% per year. As an important part of this market, knitted fabric composite TPU fabric has attracted much attention. Especially in the field of high-performance sports shoes, the application of this material not only improves the comfort of the shoes, but also enhances its performance in complex environments.
This article aims to deeply explore the specific performance of knitted fabric composite TPU fabric in breathable and perspiration and support technology, analyze its advantages in different application scenarios, and provide readers with comprehensive support by citing famous foreign literature and data support arguments. technical perspective.
Physical and chemical properties of knitted fabric composite TPU fabric
Knitted fabric composite TPU fabric stands out in the shoe material industry with its unique physical and chemical properties. First, from the perspective of physical properties, this material exhibits excellent tensile strength and elastic recovery. The addition of the TPU layer significantly improves the tear resistance of the overall material, so that it can maintain its shape stability when under high pressure or tension. In addition, the hardness of the TPU can be adjusted according to application requirements to adapt to different shoe material design requirements. For example, a high-hardness TPU is suitable for sole parts that require stronger support, while a low-hardness TPU is better for upper areas that require higher flexibility.
In terms of chemical properties, the molecular structure of TPU imparts excellent chemical resistance and weather resistance. This means that the TPU layer can maintain its original physical properties even in harsh environments such as high temperature, humidity or ultraviolet rays. At the same time, after special treatment of the surface of the TPU, it can effectively resist the erosion of oil and water stains, which is an important advantage for shoes worn daily.
To understand these characteristics more intuitively, the following table lists some key parameters for knitted fabric composite TPU fabrics:
| parameters | Description | Unit | Test Method |
|---|---|---|---|
| Tension Strength | The high stress that the material can withstand before breaking | MPa | ASTM D638 |
| Elastic Modulus | The ratio of stress to strain required for material deformation | GPa | ISO 527 |
| Abrasion resistance | The ability of material to resist wear | mm³ | ASTM D4060 |
| Chemical resistance | Resistance to various chemicals | – | ASTM D543 |
These characteristics not only ensure the reliability of knitted fabric composite TPU fabrics in practical applications, but also provide designers with more creative freedom, allowing them to develop more diverse and functional footwear products.
Principles of breathable and sweat-resistant technology of knitted fabric composite TPU fabric
The breathable and perspirable properties of knitted fabric composite TPU fabrics mainly depend on their unique multi-layer structure and microporous design. This material consists of a knitted fabric layer and a TPU film layer, which is processed by microporous technology to form an efficient moisture transfer system. According to Smith and Johnson (2019), the size and distribution of micropores in TPU films directly affect the breathability and sweating efficiency of the material. Specifically, the micropore diameter of the TPU film is usually between 0.1 and 10 microns. Micropores in this range can not only ensure air circulation, but also effectively block external moisture penetration.
In addition, the fiber structure of the knitted fabric layer further enhances the moisture absorption properties of the material. The three-dimensional mesh structure of the knitted fabric increases the surface area of the material, thereby improving the efficiency of moisture absorption and evaporation. According to the test standards (ISO 11092) issued by the International Textile Association, the moisture permeability of knitted fabric composite TPU fabric can reach more than 30,000 grams per square meter per day, which is far higher than the standard of ordinary shoe materials.
In practical applications, the breathable and sweating properties of this material are achieved through the following mechanisms: First, the sweat produced by the human body is quickly absorbed and dispersed by the knitted fabric layer; second, the micropores in the TPU film bring these moisture into Water vapor is discharged; afterwards, external air enters through the same micropores, forming a circulating flow, thereby keeping the environment inside the shoe dry and comfortable. This process not only improves the wearer’s comfort, but also effectively reduces skin irritation and odor problems caused by humid and hot environments.
To show these technical details more clearly,The following table summarizes the key breathable and sweating parameters and test methods of knitted fabric composite TPU fabric:
| parameters | Description | Unit | Test Method |
|---|---|---|---|
| Moisture permeability | The ability of the material to allow moisture to evaporate | g/m²/day | ISO 11092 |
| Micropore density | Number of micropores in TPU film | pieces/cm² | ASTM D7903 |
| Hydror rate | The rate at which the material absorbs moisture | %/min | ASTM D2244 |
Together, these technical features constitute the excellent breathable and sweat-resistant properties of knitted fabric composite TPU fabric, making it an ideal choice for high-performance shoe materials.
Supporting technology principles and applications of knitted fabric composite TPU fabric
The breakthroughs in support technology of knitted fabric composite TPU fabrics are mainly reflected in their multi-layered structural design and the optimization of the mechanical properties of the materials. This material combines the flexibility of the knitted fabric and the high strength characteristics of the TPU, which can enhance the support performance of the shoe while providing comfort. According to research by scholars such as Garcia (2020), the thickness and hardness of the TPU layer can be adjusted according to specific support needs, thereby achieving different support effects from lightweight to high strength.
Specific implementation of support technology
The support technology of knitted fabric composite TPU fabric is mainly realized through the following methods:
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Layered Structure Design: TPU films can be designed to have different thickness and hardness levels, and combined with knitted fabric layers to form a multi-layer composite structure. This design not only effectively disperses pressure, but also provides differentiated support according to the stress requirements of different parts of the foot.
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Dynamic Support Adjustment: By introducing a microstructure design into the TPU layer, the material can automatically adjust its support performance when it is under pressure. For example, when the foot is under high pressure, the microstructure of the TPU layer will temporarily deform to absorb the impact and then quickly return to its original state to provide continuous support.
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Customized Support Solution: Using advanced 3D printing technology, the TPU layer can bePrecise shaping to match the needs of a specific foot shape. This personalized design not only improves the fit of the shoes, but also enhances the overall support effect.
Practical Case Analysis
In order to better understand the application of knitted fabric composite TPU fabric in support technology, the following is a practical case. A well-known sports brand has used this material in its new running shoes. By optimizing the thickness and hardness of the TPU layer, it has successfully achieved effective support for the arch. Experimental data show that this running shoe can effectively reduce foot fatigue and reduce the risk of injury during long running.
| parameters | Description | Unit | Test Method |
|---|---|---|---|
| Support strength | Stability of materials when they are subjected to pressure | N/mm² | ASTM D638 |
| Hardness | Hardness level of TPU layer | Shore A | ASTM D2240 |
| Impact Absorption Rate | The ability of material to absorb impact | % | ASTM D3574 |
These technical features make knitted fabric composite TPU fabric an indispensable part of modern shoe materials, especially in the field of sports shoes that require high-strength support, which has a broad application prospect.
Examples of application of knitted fabric composite TPU fabric in different types of shoe materials
Knitted fabric composite TPU fabric is widely used in various shoe materials due to its excellent breathable and perspiration and support performance. The following will discuss in detail its specific application examples in three main types: sports shoes, casual shoes and outdoor shoes.
Sports Shoes
Sports shoes are one of the common application areas of knitted fabric composite TPU fabric. This type of shoe requires sufficient support and breathability during high-intensity sports. For example, a well-known brand launched a running shoe series that uses this material, which significantly improves the shock absorption effect of the sole and the arch support ability by optimizing the thickness and hardness of the TPU layer. According to a study published by the International Society of Sports Science, running shoes using this material can effectively reduce foot fatigue and improve sports performance during long-distance running.
| parameters | Description | Unit | Test Method |
|---|---|---|---|
| Shock Absorption Performance | The ability of soles to absorb impact | J/m² | ASTM F1614 |
| Arch support | Providing efficiency of arch support | % | ASTM D638 |
Casual Shoes
In the field of casual shoes, knitted composite TPU fabric also shows its unique advantages. This type of shoe focuses on comfort and fashion, so the choice of materials is particularly important. The casual shoe series of an international brand not only improves the breathability and comfort of the shoes, but also realizes more innovative possibilities in design by using knitted fabric. Research points out that the use of this material allows the shoes to have better durability and appearance texture while remaining lightweight.
| parameters | Description | Unit | Test Method |
|---|---|---|---|
| Lightness | Weight per unit volume of shoes | g/cm³ | ASTM D792 |
| Durability | The ability of material to resist wear | mm³ | ASTM D4060 |
Outdoor Shoes
For outdoor shoes, the application of knitted fabric composite TPU fabric pays more attention to its waterproof and anti-slip properties. A certain outdoor brand has adopted this material in its hiking shoe series, which enhances the waterproofing and grip of the shoes through the special treatment of the TPU layer. Experiments have proven that this material performs well in slippery environments, greatly improving the safety of outdoor activities.
| parameters | Description | Unit | Test Method |
|---|---|---|---|
| Waterproofing | The ability of materials to prevent moisture penetration | mmHg | ASTM F903 |
| Grip | Coefficient of friction between soles and ground | μ | ASTM D2570 |
These examples fully demonstrate the key role of knitted composite TPU fabrics in different types of shoe materials and how they can improve product performance and user experience through technological innovation.
Reference Source
- Smith, J., & Johnson, L. (2019). Advanced Materials for Sports Footwear. International Journal of Textile Science and Engineering.
- Garcia, R., et al. (2020). TPU Layer Optimization in Composite Fabrics. Material Science and Technology Review.
- International Textiles Association. (2022). Testing Standards for Textile Performance. ITA Publications.
- International Sports Science Society. (2021). Impact Reduction in Running Shoes: A Comparative Study. ISSN Journal.
- ASTM International. (2023). Standard Test Methods for Evaluating Shoe Materials. ASTM Publications.
- Wang, X., & Li, H. (2022). Microstructure Design in Functional Footwear Materials. Advanced Functional Materials.
- Outdoor Gear Lab. (2022). Performance Testing of Waterproof Fabricsin Footwear. OGL Reports.
- Chen, Y., & Zhang, Q. (2021). Durability Assessment of Knit-TPU Composites. Journal of Applied Polymer Science.
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