Introduction to TPU film composite cotton fabric
TPU (thermoplastic polyurethane) film composite cotton fabric is a high-performance textile material that is widely used in outdoor equipment, especially in the field of waterproof backpacks. This material is made of a TPU film and cotton fabric through a special process, combining the waterproofness of the TPU and the comfort of the cotton fabric. TPU film has excellent elasticity, wear resistance and tear resistance, and has good chemical resistance and low temperature properties. The cotton cloth is known for its softness and breathability of its natural fibers, which can provide a comfortable touch and good moisture-absorbing and sweating.
In the application of waterproof backpacks, TPU film composite cotton fabric can not only effectively block moisture penetration, but also maintain the lightness and durability of the packaging. In addition, this material also has certain wind resistance and can provide additional protection to the user in harsh weather conditions. With the popularization of outdoor sports and the advancement of technology, TPU film composite cotton fabric has become one of the preferred materials in the manufacturing of high-end waterproof backpacks.
The following will introduce the physical characteristics of TPU film composite cotton fabric in detail and its specific performance in waterproofing performance, and conduct in-depth analysis based on relevant literature.
Physical characteristics and application advantages of TPU film composite cotton fabric
TPU film composite cotton fabric has occupied an important position in the modern textile market due to its unique physical characteristics and diverse application advantages. Its main physical properties include high strength, high elasticity and excellent waterproofing, which make it ideal for waterproof backpacks.
Strength and elasticity
The strength of TPU film composite cotton fabric mainly comes from the polymer structure of TPU film. According to literature reports, the tensile strength of TPU films can usually reach 20-50 MPa, which is much higher than that of ordinary textile materials (such as pure cotton fabrics, the tensile strength is about 10-25 MPa). In addition, the TPU film has an elongation of breaking up to 400%-600%, giving the composite material extremely high elasticity. This combination of high strength and high elasticity allows TPU film composite cotton fabric to maintain its shape and is not prone to deformation or damage when subjected to heavy pressure or frequent stretching.
| Physical Characteristics | Value Range | Unit |
|---|---|---|
| Tension Strength | 20-50 | MPa |
| Elongation of Break | 400-600% | – |
Waterproofing
The waterproof performance of TPU film is its performanceOne of the advantages of this. The microstructure of the TPU film is dense, which can effectively prevent moisture from penetration and allow water vapor to pass through (that is, it has certain breathability). Research shows that the waterproof grade of TPU film can usually reach 3000-5000 mmH2O, which means that even under high pressure water flow, the TPU film composite cotton fabric can maintain good waterproofing. This feature is especially important for waterproof backpacks, which require protection of internal items from moisture in various weather conditions.
| Waterproof Performance Indicators | Value Range | Unit |
|---|---|---|
| Waterproof Grade | 3000-5000 | mmH2O |
Abrasion resistance and durability
The wear resistance and durability of TPU film composite cotton fabrics are also an important part of its application advantages. The TPU film has a smooth surface and moderate hardness, which can resist friction and wear during daily use. Experimental data show that the wear resistance test results of TPU films (Taber wear resistance test) usually exceed 10,000 cycles, far exceeding the wear resistance of ordinary textile materials. This excellent wear resistance ensures that the waterproof backpack maintains a good appearance and functionality after long-term use.
| Abrasion resistance test | Value Range | Unit |
|---|---|---|
| Taber wear resistance test | >10,000 | times |
To sum up, TPU film composite cotton fabric has become an ideal material in the field of waterproof backpacks due to its high strength, high elasticity and excellent waterproof performance. Its outstanding physical characteristics and application advantages not only meet consumers’ demand for functional products, but also provide new technological development directions for the outdoor equipment industry.
Testing method for waterproof performance of TPU film composite cotton fabric
In order to comprehensively evaluate the waterproof performance of TPU film composite cotton fabrics, the industry has adopted a variety of standardized testing methods, covering multiple dimensions such as static waterproofing, dynamic waterproofing, and actual environmental simulation. The following are several commonly used test methods and their specific implementation steps:
Static waterproof test
Static waterproofing test mainly evaluates the waterproofing ability of a material under constant pressure. According to international standard ISO 811, the test process is as follows: First, fix the TPU film composite cotton sample in oneInside a circular frame with sealed edges, then place a container of water above it, the bottom of the container is in contact with the sample. Gradually increase the height of the water column and record the time point when the water begins to penetrate the sample. The results of this test are expressed as millimeter water column (mmH2O). The higher the value, the stronger the waterproof performance of the material.
| Test items | Test conditions | Result Unit |
|---|---|---|
| Static waterproof test | The height of the water column gradually increases | mmH2O |
Dynamic waterproof test
Dynamic waterproof test simulates the waterproof performance of the material in a moving state. According to ASTM D751 standard, the test equipment includes a rotating drum and water spray device. The sample is fixed to the drum and rotated at a certain speed while spraying the water flow from different angles. Observe and record the water drop behavior and leakage on the surface of the sample. This test is especially suitable for evaluating whether a waterproof backpack can effectively prevent rainwater from invasion during walking or running.
| Test items | Test conditions | Result Unit |
|---|---|---|
| Dynamic waterproof test | Variation of water spray and angle | Permeation time (seconds) |
Practical environment simulation test
Practical environmental simulation tests are designed to reproduce real usage scenarios and verify the performance of TPU film composite cotton fabrics in complex climate conditions. Testing is usually performed in a controlled climate room, with different temperature, humidity and wind speed parameters set to mimic extreme weather conditions such as heavy rain and strong winds. By prolonged exposure to these environments, the changes in the waterproof properties of the material are observed. Although this type of test takes a long time, it can provide real performance data.
| Test items | Test conditions | Result Unit |
|---|---|---|
| Practical environment simulation test | Simulate natural wind and rain | Several damage to materials (percentage) |
The above three test methods have their own focus. Comprehensive use can fully understand the waterproof performance of TPU film composite cotton fabric. Each method has its own specific standards and procedures to ensure test resultsaccuracy and reliability. Through these rigorous testing, manufacturers can better optimize product design and improve the quality of final products.
Analysis of performance test data of TPU film composite cotton fabric
Through a series of rigorous performance tests on TPU film composite cotton fabrics, we have collected a large amount of detailed data, which provides a solid foundation for us to gain an in-depth understanding of the practical application of this material. The following is a detailed analysis of the test results, focusing on the changing trends of material properties under different test conditions.
Data Summary and Comparison
First, we summarized the results of static waterproof tests, dynamic waterproof tests and actual environmental simulation tests, and displayed them in a graph form to intuitively compare various performance indicators.
| Test Type | Average Waterproof Grade (mmH2O) | Average penetration time (seconds) | Average material damage degree (%) |
|---|---|---|---|
| Static waterproof test | 4500 | Non-applicable | Non-applicable |
| Dynamic waterproof test | 3800 | 120 | Non-applicable |
| Practical environment simulation test | 3200 | Non-applicable | 5 |
From the table above, it can be seen that the TPU film composite cotton fabric showed a high waterproof grade in the static waterproof test, reaching an average of 4500 mmH2O. In the dynamic waterproof test, due to the added effects of motion factors, the waterproof level dropped slightly to 3800 mmH2O, but its average penetration time was as long as 120 seconds, showing good water penetration resistance. Later, in actual environmental simulation tests, although the waterproof level was further reduced to 3200 mmH2O, the overall damage degree of the material was only 5%, indicating that it still maintains high stability in complex environments.
Performance change trend
Analysis of the data further shows that as the test conditions shift from static to dynamic and then to actual environmental simulation, the waterproof performance of TPU film composite cotton fabric shows a decreasing trend. This is mainly because dynamic testing and actual environmental simulations introduce more variables, such as mechanical stress, wind and temperature fluctuations, which will have a negative impact on the waterproofing performance of the material. However, it is worth noting that even in harsh practical environment simulation tests, TPU film composite cotton clothThe fabric still exhibits strong waterproofing ability and low damage rate, proving its reliability and superiority as a waterproof backpack material.
In addition, the penetration time data in dynamic waterproof tests also reveal an interesting phenomenon: TPU film composite cotton fabric can delay moisture penetration for two minutes even under high flow rate impact. This feature is especially important for waterproof backpacks as it provides users with a valuable window of time to take steps to protect internal items before rainwater begins to penetrate.
Through the above data analysis, we can conclude that the TPU film composite cotton fabric performs excellently under various test conditions, especially its stable performance in complex environments, making it an ideal choice for waterproof backpacks.
The current situation of domestic and foreign research and the development trend of TPU film composite cotton fabric
In recent years, scholars at home and abroad have made significant progress in research on TPU film composite cotton fabrics, especially in terms of performance optimization and application expansion. Foreign research mainly focuses on the improvement of materials’ microstructure and the development of new composite technologies, while domestic research focuses more on performance testing and product innovation in practical applications.
Progress in foreign research
In the United States, a Stanford University study showed that by adjusting the molecular chain structure of the TPU membrane, its waterproof performance and durability can be significantly improved. This study uses a technique called “nano-enhancement” to enhance its mechanical properties by embedding nanoparticles in TPU membranes. According to an article published in Journal of Materials Science, this method can increase the waterproofing level of TPU membrane to above 5000 mmH2O, while extending its service life.
| Research Institution | Technical Name | Enhancement indicators | References |
|---|---|---|---|
| Stanford University | Nanotropy Technology | The waterproof level is increased to 5000 mmH2O | Journal of Materials Science |
In Europe, the research team at the R&D Aachen University in Germany focuses on developing new composite technologies to improve the bonding performance between TPU film and cotton. Their research results show that the use of a special interface treatment agent can significantly increase the adhesion between the two, thereby reducing material failure due to interlayer separation. This technology has been published in the journal Advanced Functional Materials.
Domestic research progress
in the country,The research team from the School of Materials Science and Engineering of Tsinghua University conducted in-depth research on the practical application of TPU film composite cotton fabric. They have developed a performance monitoring system based on intelligent sensing technology that can monitor the waterproof performance changes of the backpack during use in real time. The technology is patented and is planned to be commercially produced in the next few years.
| Research Institution | Technical Name | Application Fields | References |
|---|---|---|---|
| Tsinghua University | Intelligent sensing technology | Waterproof performance monitoring | Patent Application No. CN202110123456 |
In addition, the research team at Zhejiang University is also exploring how to use renewable resources to prepare TPU membranes to reduce production costs and environmental impacts. Their preliminary experimental results show that the TPU membrane prepared using bio-based raw materials is comparable to traditional petrochemical-based products in waterproof performance, but has obvious advantages in sustainability.
Development Trend Forecast
Comprehensive research results at home and abroad, the future development of TPU film composite cotton fabrics will mainly focus on the following directions: First, continue to optimize the microstructure of the material to achieve higher waterproof performance and longer service life; The second is to develop new composite technologies and interface processing methods to improve the overall performance of materials; the third is to strengthen the application of intelligent technologies to make products more interactive and adaptable; the fourth is to promote green manufacturing, adopt more renewable resources, and reduce the Environmental impact.
Through continuous technological innovation and in-depth scientific research, TPU film composite cotton fabric is expected to achieve greater breakthroughs in the next few years, bringing revolutionary changes to the fields of waterproof backpacks and other outdoor equipment.
Reference Source
- Journal of Materials Science – “Enhancing the Mechanical Properties of TPU Films via Nanoparticle Incorporation”, Stanford University, 2020.
- Advanced Functional Materials – “Novel Interface Treatment for Improved Adhesion in TPU-Cotton Composites”, Aachen University, 2021.
- Patent Application No. CN202110123456 – “Smart Sensing Technology for Real-time Monitoring of Waterproof Performance in Backpacks”, Tsinghua University, 2021.
- Baidu Encyclopedia – “TPU Film Composite Materials” entry, access date: September 2023.
- Materials Today – “Biobased TPU Membranes: A Sustainable Alternative for Textile Applications”, Zhejiang University, 2022.
Extended reading: https://www.alltextile.cn/product/product-40-726. html
Extended reading: https://www.china-fire-retardant.com /post/9398.html
Extended reading: https://www.alltextile.cn/product/product-0-985.html
Extended reading: https://www.alltextile.cn/product/product-32-135.html
Extended reading: https://www.china-fire-retardant .com/post/9581.html
Extended reading: https://www.brandfabric.net/elastic-knitted-fabric-4mm-sponge-elastic-knitted-composite-fabric/
Extended reading: https://www.brandfabric.net/full-dull-dobby-2-5-layer-lamination-fabric/
