Is Blue SMS Nonwoven Fabric waterproof?
As a supplier of Blue SMS Nonwoven Fabric, I often encounter inquiries from customers regarding its waterproof properties. In this blog post, I will delve into the scientific aspects of this fabric to determine whether it is truly waterproof.
Understanding Blue SMS Nonwoven Fabric
First, let's understand what Blue SMS Nonwoven Fabric is. SMS stands for Spunbond - Meltblown - Spunbond. This type of nonwoven fabric is composed of three layers: two outer spunbond layers and a middle meltblown layer. The spunbond layers provide strength and durability, while the meltblown layer offers filtration and barrier properties. The "blue" in Blue SMS Nonwoven Fabric refers to its color, which may be achieved through the addition of dyes during the manufacturing process.
The raw material of this fabric is typically polypropylene. Polypropylene is a thermoplastic polymer known for its chemical resistance, low density, and good mechanical properties. These characteristics make it a popular choice for nonwoven fabric production.
Factors Affecting Waterproofness
To determine whether Blue SMS Nonwoven Fabric is waterproof, we need to consider several factors:
1. Fiber Structure
The structure of the fibers in the fabric plays a crucial role in its waterproofness. In the spunbond layers, the polypropylene fibers are arranged in a more orderly manner, providing a certain degree of strength and resistance to liquid penetration. The meltblown layer, on the other hand, consists of fine fibers that are randomly oriented, creating a dense network that can trap and block water droplets.
The diameter of the fibers also affects waterproofness. Smaller diameter fibers in the meltblown layer can form a tighter barrier, making it more difficult for water to pass through.
2. Pore Size
The pore size of the fabric is another important factor. Pores are the spaces between the fibers in the fabric. If the pore size is small enough, it can prevent water droplets from passing through. In Blue SMS Nonwoven Fabric, the meltblown layer usually has a smaller pore size compared to the spunbond layers, which enhances its waterproof performance.
However, the pore size can be affected by factors such as the manufacturing process, fiber density, and pressure applied during use. For example, if the fabric is stretched or compressed, the pore size may change, potentially affecting its waterproofness.
3. Surface Treatment
Surface treatment can significantly improve the waterproofness of Blue SMS Nonwoven Fabric. A common surface treatment is the application of a water - repellent coating. This coating can reduce the surface tension of the fabric, causing water droplets to bead up and roll off instead of being absorbed.
There are different types of water - repellent coatings available, such as fluoropolymer coatings and silicone - based coatings. These coatings can provide long - lasting waterproof protection, but they also need to be carefully selected and applied to ensure they do not affect the other properties of the fabric, such as breathability.
Testing the Waterproofness
To accurately assess the waterproofness of Blue SMS Nonwoven Fabric, various testing methods can be used:
1. Hydrostatic Head Test
The hydrostatic head test measures the pressure required for water to penetrate the fabric. In this test, a sample of the fabric is placed in a test apparatus, and water is gradually applied to one side of the fabric until it starts to penetrate. The height of the water column at the point of penetration is recorded as the hydrostatic head. A higher hydrostatic head value indicates better waterproofness.
2. Spray Test
The spray test evaluates the fabric's ability to resist water spray. A sample of the fabric is placed on a flat surface, and water is sprayed onto the fabric from a specific height and at a certain flow rate. The fabric is then visually inspected to determine the degree of wetting. The results are usually rated on a scale from 1 to 5, with 5 being the best (no wetting).
Real - World Applications and Waterproof Performance
Blue SMS Nonwoven Fabric is widely used in various applications where waterproofness is required. Some of these applications include:
1. Medical Disposable Products
In the medical field, Blue SMS Nonwoven Fabric is used to make surgical gowns, drapes, and masks. These products need to provide a barrier against body fluids, blood, and other contaminants. Thanks to its waterproof properties, the fabric can effectively prevent the penetration of liquids, reducing the risk of cross - infection.
2. Protective Clothing
For workers in industries such as chemical, oil, and construction, protective clothing made from Blue SMS Nonwoven Fabric can protect them from exposure to water, chemicals, and other hazardous substances. The waterproofness of the fabric ensures that the wearer stays dry and protected in wet and harsh environments.
3. Packaging
In the packaging industry, Blue SMS Nonwoven Fabric can be used for packaging products that need to be protected from moisture. For example, it can be used to package electronic products, food, and pharmaceuticals, preventing water damage and extending the shelf life of the products.
Comparison with Other Nonwoven Fabrics
When comparing Blue SMS Nonwoven Fabric with other nonwoven fabrics, such as Hydrophilic Nonwoven Fabric, their waterproof properties are quite different. Hydrophilic nonwoven fabric is designed to absorb water, so it is not waterproof. In contrast, Blue SMS Nonwoven Fabric is engineered to resist water penetration.
Another type of nonwoven fabric, PP Nonwoven Fabric for Shopping Bag, is mainly used for its strength and durability. While it may have some resistance to water, its waterproof performance is not as good as that of Blue SMS Nonwoven Fabric.
Polypropylene Spun Bond Non Woven Fabric has a simpler structure compared to Blue SMS Nonwoven Fabric. It consists of only spunbond layers, so its waterproofness is relatively limited. The addition of the meltblown layer in Blue SMS Nonwoven Fabric significantly enhances its waterproof performance.
Conclusion
In conclusion, Blue SMS Nonwoven Fabric has good waterproof properties, thanks to its unique structure, fiber characteristics, and potential surface treatments. However, its waterproofness is not absolute and can be affected by various factors such as fiber structure, pore size, and surface treatment.
In real - world applications, Blue SMS Nonwoven Fabric can effectively provide a barrier against water and other liquids, making it suitable for use in medical, protective, and packaging industries.
If you are interested in our Blue SMS Nonwoven Fabric or have any questions regarding its waterproofness or other properties, please feel free to contact us for further discussion and procurement negotiation. We are committed to providing high - quality products and excellent service to meet your needs.
References
- "Nonwoven Fabric Technology and Applications" by X. Chen
- "Textile Science and Technology: Nonwovens" edited by A. R. Horrocks and S. C. Anand
