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Structure and Materials of Meltblown Fabric
Manufacturing Process of Meltblown Fabric
What Is Meltblown Fabric? Principles, Applications, and Mask Usage
Meltblown fabric is a material characterized by its ultra-fine fiber structure and high uniformity. During the pandemic, it became a critical component in masks and other protective products due to its excellent filtration performance and unique structure. As demand has increased, its applications have continued to expand.This article explains what meltblown fabric is, how its structure works, and how it is manufactured, helping readers better understand the important role it plays in everyday life.
Definition of Meltblown Fabric
Meltblown fabric is a type of nonwoven material made by extruding molten polymers into fibers using high-speed airflow. Its ultra-fine fiber structure makes it widely used in medical applications (such as masks, surgical gowns, and sanitary products) and industrial uses (such as filters, insulation materials, and packaging).
In addition, meltblown fabric offers good tensile strength and abrasion resistance. It can also be combined with other materials to create composites with antibacterial, waterproof, and heat-resistant properties. With technological advancements, its application scope continues to grow.
PP Meltblown Fabric
PP meltblown fabric is made from metallocene polypropylene. It is formed into ultra-fine fibers through high-temperature, high-speed meltblowing, followed by electret treatment to retain static charges. In addition to physical filtration, it can effectively attract charged or tiny particles (such as bacteria and droplet nuclei), enhancing filtration performance.
HEPA Meltblown Fabric
HEPA meltblown fabric combines meltblown technology with hydro charging processing to generate stable charges. It achieves high filtration efficiency while maintaining low pressure drop and good breathability. Its particle filtration efficiency (PFE) can exceed 99.95%, effectively filtering PM2.5, pollen, and particles larger than 0.3 microns, and meets international testing standards.
Differences Between Meltblown Fabric and Regular Nonwoven Fabric
Meltblown fabric differs significantly from traditional nonwoven fabrics (such as spunbond). Its fiber diameter typically ranges from 1 to 5 microns, much finer than other materials. This gives it a larger surface area and higher filtration efficiency.Its randomly arranged fiber network helps effectively block fine particles. Additionally, its high porosity and electrostatic properties further enhance filtration performance, making it far superior to many traditional materials.
Why Meltblown Fabric Is the Core Material of Masks
Meltblown fabric plays a crucial role as the core filtration layer in masks. Its micro-scale fiber structure and high porosity enable it to effectively filter bacteria, viruses, dust, and other airborne particles.As the middle filtration layer, it significantly improves filtration efficiency while maintaining good breathability, ensuring both protection and comfort for the wearer.
Importance of Meltblown Fabric After COVID-19
Since the outbreak of COVID-19, demand for meltblown fabric has surged, making it a key material in protective products. As a major component of N95 masks, it can filter at least 95% of particles sized 0.3 microns.With the global increase in demand for medical protection, production capacity has expanded, and applications have broadened, making it an indispensable material in pandemic prevention.
Structure and Materials of Meltblown Fabric
Main Material: Polypropylene (PP)
The primary raw material for meltblown fabric is polypropylene (PP), a thermoplastic polymer. It has excellent melt flow and processability, making it ideal for meltblown production.Polypropylene is chemically resistant, non-toxic, and relatively strong, which makes it an ideal choice for this application.
Microfiber Structure
The fiber diameter of meltblown fabric typically ranges from 1 to 5 microns. These ultra-fine fibers form a dense network that provides a large surface area for capturing tiny particles.With advancements in manufacturing technology, modern meltblown fabrics maintain high filtration efficiency while offering improved breathability.
High Porosity and Filtration Efficiency
Meltblown fabric has extremely high porosity, contributing to its excellent filtration performance. High porosity helps trap and absorb airborne contaminants while maintaining airflow.Filtration efficiency depends on fiber diameter, porosity, and electrostatic effects. Typically, it can filter more than 90% of fine particles, which is why it is widely used in masks.
Manufacturing Process of Meltblown Fabric
Principle of Meltblown Technology
The meltblown process involves heating polymers like polypropylene until they melt, then using high-pressure hot air to extrude them into ultra-fine fibers. These fibers are randomly deposited to form the fabric structure.This method is highly efficient and enables large-scale production in a short time.
Meltblown Nonwoven Production Process
The production process includes several key steps, each critical to the final product quality:
1. Raw Material Heating and Melting
Polypropylene pellets are fed into an extruder and heated to a molten state. Precise temperature control is required to ensure smooth flow without degradation.
2. Fiber Drawing
The molten polymer is extruded through nozzles and stretched into ultra-fine fibers by high-speed airflow. These fibers can reach micro- or even nanoscale diameters, creating a high surface area.
3. Web Formation
Fibers are collected into a uniform, seamless web structure using airflow deposition. This enhances fabric density and strength.
4. Electret Treatment (Electrostatic/Hydro charging)
Fibers are treated to retain static charges, enabling them to attract and capture fine particles such as bacteria and dust, improving filtration efficiency.
5. Winding
The formed fabric is rolled into continuous sheets, making it easy to handle and process further.
6. Packaging
After quality inspection, the fabric is cut into required sizes and packaged to ensure cleanliness and safe transport. Related reading:
Applications and Future Prospects
With its unique structure and superior filtration performance, meltblown fabric has become an essential material in masks and protective products. Beyond healthcare, it is increasingly used in industrial and environmental applications.As global demand for protection continues to rise, meltblown fabric will remain a key material in future protective technologies.If you have any questions about meltblown fabric manufacturing, applications, or quality control, feel free to contact us for professional support.
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References
1-NIOSHN
95 Respirators and Surgical Masks – Filtration Mechanisms
2-Materials (MDPI)
Advancement of Nonwoven Fabrics in Personal Protective Equipment
3-ScienceDirect
Meltblown Technology Overview
