🧬 How Does SMS Nonwoven Fabric Block Bacteria?
Let’s break down the science behind the 3-layer SMS structure with a close-up under the microscope.
🔍 What is SMS Fabric?
SMS stands for Spunbond–Meltblown–Spunbond, a tri-layer nonwoven fabric used in medical and industrial protective gear. It combines strength, filtration, and comfort.
🔬 Microscopic Structure – Layer by Layer:
🟦 1. Outer Spunbond Layer (S):
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Made of strong polypropylene fibers
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Repels fluids and blocks larger particles
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Provides structure and durability
🟨 2. Middle Meltblown Layer (M):
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Ultra-fine microfibers (~2-5μm)
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Acts as the main bacteria filter
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Captures microorganisms using electrostatic absorption + physical barrier
🟦 3. Inner Spunbond Layer (S):
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Soft and skin-friendly
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Reinforces the middle layer
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Adds wearer comfort
💡 Why It Works:
The meltblown layer is the key to filtration, while the outer and inner layers protect and support it. Together, they form a highly efficient bacteria-blocking barrier.
✅ Ideal for:
✔️ Medical gowns
✔️ Disposable coveralls
✔️ Face masks
✔️ Cleanroom applications
