Friends who have watched medical dramas should be familiar with the “blue-green” color in the operating room: doctors and nurses are tightly wrapped in masks, hats, and isolation gowns, with only one pair of eyes exposed. Have you ever thought, why would they dare to block the splashing blood on the operating table with their thin and paper like clothes? Why wouldn’t doctors be “electrified” in the “static electricity crisis” surrounded by electric knives and monitors?
The answer lies in the material of this garment – medical SMS non-woven fabric .
It is not ordinary cloth or plastic, but a meticulously designed and layered “liquid armor” and “electrostatic insulator”. Today, let’s take apart this’ invisibility cloak ‘and see what makes it stand out.
SMS is not an abbreviation, but a bowl of sandwich
Let’s first explain the name that sounds like Morse code: SMS, which stands for Spunbond – Meltblown – Spunbond .
It doesn’t matter if you don’t understand, just imagine SMS as a bowl of artisanal sandwich – the upper and lower layers of bread slices are made of spunbond layers (S) woven from continuous filaments, which are strong, durable, and not easily torn or worn. It’s like building a “steel frame” for the body. The layer of ham sandwiched in the middle is the meltblown layer (M), with incredibly fine fibers, one hundred times finer than spunbond fibers, and a diameter of only 0.01 to 0.05 dtex. These ultrafine fibers are randomly wrapped and woven into a dense “nano mesh wall”. bacteria? Bacteria? Blood droplets? Want to rush over? Sorry, there’s no door!
The S layer keeps your clothes from breaking, the M layer keeps liquids from entering, and with three layers combined, a surgical gown has a “steel frame” and a “diamond cover”. This is also why research results have shown that PP SMS protective clothing provides much higher blood penetration and microbial penetration protection than traditional pure cotton woven surgical gowns.
However, having the “embryo” of sandwiches alone is not enough. In order for SMS to truly perform on the operating table and withstand practical combat, it also needs to be given a “magic buff” – this is the “three resistance” treatment.
A layer of “nano mesh” as thin as hair, plus a layer of “rainproof cloth” coating
Many people think that surgical gowns prevent blood by relying on waterproofing? absolutely wrong! The blood on the operating table is not statically splashed onto you, but rather a pressurized splash generated by actions such as electric knife cutting and syringe injection. Ordinary waterproof cloth may be able to block stagnant water, but facing pressurized blood is another matter.
The first line of defense is the “pure physical compression” of the melt blown layer.
How dense is the ultrafine fiber mesh of the melt blown layer? It can even block particles as small as 0.1 micrometers. Bacteria and viruses usually need to adhere to liquid droplets to spread, while the densely packed cross fibers in the M layer are like a “nano filter” buried in clothing, intercepting droplets and blood carrying pathogens. Simply put, do liquids want to travel in a straight line? The fiber is denser than it, crushing it.
But physical barriers are only the first level. SMS itself is made of polypropylene material, which is naturally hydrophobic. Water droplets falling on it will roll away like on a lotus leaf. There are advantages and disadvantages to this – the advantage is that it is inherently water repellent, but the disadvantage is that if even the liquid bounces open, it may not be sufficient to resist high-energy challenges such as blood.
So the real “black technology” appeared: post-treatment of fluorine-containing finishing agents.
After the SMS composite is completed, it will not be directly sent to be sewn into clothes, but needs to undergo “three resistance” finishing – anti water, anti alcohol, and anti blood. Fluorine based materials are generally used for processing liquids, forming a dense “low surface energy barrier layer” on the surface of non-woven fabrics. Its principle is simple: the surface tension becomes extremely low, and liquid molecules cannot grasp it at all. When it drips, it bounces off and flows away, and no matter how high the pressure is, it will not drill down.
This is like brushing a non stick coating on the outside of your raincoat, so that even blood and water “slip away” without giving them a chance to penetrate. According to the national standard GB 19082-2023 “Technical Requirements for Disposable Protective Clothing for Medical Use”, the resistance to synthetic blood penetration must reach * * not lower than level 3 * *, and blood can only penetrate during pressure testing to be considered qualified. For AAMI Level 4 protective clothing with higher levels of protection, the requirements are even more stringent, almost making it impossible for bodily fluids to penetrate.
How is anti-static achieved? Preventing blood while conducting static electricity is already a ‘contradictory problem’
If anti blood is a ‘defense technique’, then anti-static is a ‘mine clearance technique’.
The operating room is not for fun. Electric knives, monitors, ventilators… precision medical instruments are everywhere. If the clothes worn by doctors have static electricity flying around, it can interfere with device readings and cause the display screen to blur, or even ignite flammable anesthetic gases with electric sparks, directly threatening life safety. So the “anti-static” demand for medical protective clothing is not just a matter of comfort, but a tangible life-saving indicator .
The national standard clearly requires that the electrical charge of disposable medical protective clothing should not exceed 0.6 microcolumns per piece. What is this concept? The static electricity generated by the crackling sound when you take off your sweater in winter is thousands of times lower.
But the problem arises: anti blood and anti-static are inherently a pair of ‘enemies’.
The anti blood requirement is that the fabric surface has low surface energy, is hydrophobic and oleophobic, and allows the liquid to bounce away. Antistatic, on the other hand, requires the fabric surface to have a certain degree of moisture absorption and retention, allowing accumulated charges to quickly dissipate and dissipate. Isn’t it like making a piece of clothing both waterproof and capable of absorbing water and conducting electricity? It’s like finding fault.
How did scientists forcibly reconcile this contradiction? There are mainly two roads.
One way is to add conductive reinforcement – adding conductive materials. Researchers have attempted to add conductive channels to SMS non-woven fabrics by adding carbon nanotubes and magnetron sputtering copper plated films. Research has found that the addition of carbon nanotubes has improved and enhanced the anti-static and water repellent properties of the samples, making it a win-win situation.
Another way is to embed anti-static formula – starting from the source. The traditional method is to immerse SMS non-woven fabric in an anti-static solution. But the efficacy is not long-lasting, it will disappear after washing twice, and it will also affect the strength of the fabric itself. So in recent years, a more advanced solution is to directly add ingredients such as polypropylene, lubricants, amphoteric surfactants, and polyethylene glycol to the raw materials of PP spunbond layers, allowing anti-static agents to “grow” inside the fibers rather than just sticking on the surface. In this way, the anti-static effect is long-lasting and stable, without damaging the mechanical and liquid repellent properties of the fabric.
That is to say, the surgical gown ultimately achieved both no electricity even if you rub it around , and no penetration even if there is bleeding during surgery . This is the true skill of medical SMS non-woven fabric.
The evolution history of surgical gowns from white cotton cloth to SMS “sandwiches” is a history of medical protection
Looking back decades ago, doctors still wore cotton surgical gowns that were washed and washed repeatedly. Those fabrics were absorbent, blood permeable, and prone to bacterial growth, making their protective capabilities better than nothing. Now, SMS non-woven fabric has become the best choice for disposable surgical gowns, protective gowns, and isolation gowns with its combination of “spunbond layer protection strength, meltblown layer penetration resistance, and three resistance treatment combined with waterproofing and anti-static”.
The global SMS protective clothing market is expected to reach billions of yuan in RMB by 2025, and is expected to continue expanding at a compound annual growth rate of over 5% in the coming years. At the same time, the industry is iterating towards more breathable, comfortable, and sustainable directions, such as SMMS (adding an extra layer of meltblown layer to enhance filtration), antibacterial functional coatings, ultrasonic sealing seams, and other new technologies emerging one after another.
The next time you see fully armed medical staff on screen, or one day walk into an operating room, perhaps you can lower your head and take a second glance at that inconspicuous blue-green battle robe. It is the “work” of SMS non-woven fabric, a perfect combination of textile science and medical needs, and the last confidence for countless medical staff to wear it and step into the “battlefield”.
They protect lives, SMS protects them.
Dongguan Liansheng Non woven Technology Co., Ltd. was established in May 2020. It is a large-scale non-woven fabric production enterprise integrating research and development, production, and sales. It can produce various colors of PP spunbond non-woven fabrics with a width of less than 3.2 meters from 9 grams to 300 grams.
Post time: Jun-01-2026