Face masks were well known when the COVID-19 epidemic broke out. People know face mask is made of nonwoven fabric. But most people don’t know which types of nonwoven the face mask contains. Medical face mask consists of three layers nonwoven cloth. The middle layer is meltblown nonwoven. The top and back layers are spunbond nonwoven. They have different functions in defending virus. What are the differences between spunbond nonwoven and meltblown nonwoven ?
What Is Spunbond Nonwoven Fabric ?
Spunbond nonwoven fabric is manufactured by the continuous process of fibers spun. It’s also called spunlaid. The polymer extrudes and stretches to form filaments. The filaments are laid in a web. Then the web bonds by itself in thermal, chemical or mechanical treatments. The web becomes a nonwoven fabric by reinforcing. Applications of spunbond nonwoven include non-woven bags, interlining, healthcare coveralls, masks and filters. It is becoming more and more popular in the industry of hygiene and medical treatment.
What Is Meltblown Nonwoven Fabric ?
The process of melt-blown is to transform polymer chips into web-like fabric. The PP melt is ready to spin after extruding, filtering and pumping. Then the hot air blows the fibers which come from meltblown die.The fibers form an entangled fibrous web. Meltblown nonwoven fabric is produced after cooling and hot milling. This simple processing makes it a distinct cost advantage over other systems.
What Is SMS Nonwoven Fabric ?
SMS nonwoven fabric is a tri laminate, composed of Spunbond, Meltblown and Spunbond. It has the same structure as a sandwich. The top layer is spunbond nonwoven. The middle layer is meltblown. Then the bottom layer comes with spunbond again.
Raw Material of Nonwoven Fabric
- Raw materials of spunbond nonwove include PP (polypropylene), Pet (Polyester), Nylon and PE (polyethylene). People like the long fiber PP most. PP spunbond nonwoven is stable, heat resistant, aging resistant and air permeability.
- Polypropylene is the main material of melt blown cloth. The fiber diameter ranges from 1 to 5 microns. It’s of good wrinkle resistance due to rich voids and fluffy structure. Melt blown fiber also performs well on filtration, shielding, heat insulation and oil absorption. Because this microfiber with unique capillary structure increases unit number of fibers.
- SMS is a combination of spunbond and melt blown. So the best raw material is polypropylene. This type nonwoven has high strength and filterability.
The three nonwoven fabric are used in different products. Now let’s go to find the differences between them.
Differences between Spunbond, Meltblown, SMS Nonwoven Fabric
Production process of spun non woven is simple. All procedures are done on a non woven production line. The steps are as follow
- Fill the raw material PP into the bin and put necessary additives.
- Extrusion machine dissolves and squeeze the material out.
- The filter removes impurities from PP solution.
- Now the spin system works. It spins and stretches the PP solution into long but thin fiber.
- Form the filament into web by calendar. Then produce the web into nonwoven fabric through their own methods. They are bonding, thermal bonding, chemical bonding or mechanical reinforcement.
Melt-blown manufacturing process is even short than spunbond
- Raw material PP comes from the first floor to third floor automatically.
- PP turns into melt by extruding.
- Melt flows into spin box after filtering and pump metering.
- In the spin box, the spin die ejects the fiber. The hot high-pressure air blows the fiber into thin and long ones.
- Melt blown nonwoven comes out by web forming and heat rolling
SMS nonwoven is made in both spunbond and melt blown processes. Spunbond and melt blown work independently before rolling mill. Then they integrate into a three-layer fiber, SMS nonwoven fabric.
Spunbond nonwoven fabric is easy to decompose. It’s also moisture-proof, breathable, flexible, light-weight and non-combustible. Now more and more people use spunbond nonwoven products instead of plastic ones. Because they are non-toxic, non-irritating, environmentally friendly and recyclable. What’s more, it’s rich in color and low in price.
Melt blown fabric is light in weight, three in fifth of the cotton. It’s soft and comfortable to the touch. Melt blown fabric is water repellent, breathable and non-absorbent. The most important is that the melt-blown cloth has good filterability. This is badly requested by medical face masks.
SMS nonwoven fabric has great advantages on water repelling. Spunbond nonwoven has properties of durability and strength in wet or dry condition. It’s very resistant to fraying and difficult to break up. Even wet spunbond cloth barely absorbs any moisture. While meltblown advantages are the soft touching and water resistance. This is why SMS nonwoven fabric is created.
Spunbond Non Woven Application
Spunbond nonwovens are mainly used in medical materials, agricultural coverage, home textiles, packaging materials, shopping bags and so on. It usually depends on the gram weight of non woven.
|Line No.||Gram Weight||Application|
|1||10-40 gsm||Medical and health products, such as masks, disposable medical isolation clothes, head covers, shoe covers, diapers, adult urinary incontinence and health products|
|2||17-100 gsm||Agricultural cover, such as crop cover, root control bag, seed bag, weeding mat, nursery cover, thermal curtain, ground protection, etc|
|3||15-85 gsm||Home textile lining, such as sofa lining, mattress spring bag, furniture lining, disposable sheet, pillow case, housing pipe packaging material, roof and tile cushion, sound insulation ceiling, floor mat composite material, insulation material, etc|
|4||40-120 gsm||Household products, such as wardrobe, storage box, tablecloth, dust cover, wallpaper, calendar, etc|
|5||50-120 gsm||Packaging materials, such as shopping bags, suit covers, gift bags, tea bags, rice and flour bags, flower packaging, etc|
|6||100-150 gsm||Blinds, car interior, photography background cloth, advertising cloth, etc|
Meltblown Non Woven Application
Melt blown nonwoven fabric is the core material of the face masks. Did you remember that it’s hard to buy one piece of this fabric during COVID-19 epidemic period ? What’s more, it is a good material of liquid filter, insulation, absorption, thermal insulation, oil-absorbing and wipers.
SMS Non woven Application
SMS nonwoven fabric has a huge market. End products usually vary from its thickness.
Thin SMMS products perform well on waterproof and breathability. They are particularly suitable for the sanitary market, such as sanitary napkins, sanitary pads, baby diapers, and adult incontinence diapers.
Medium-thickness SMS products are suitable for medical products. They contain surgical gowns, surgical wraps, surgical drapes and antiseptic bandages. After treatments of alcohol, blood and oil repellent and antistatic, this nonwoven fabric becomes the ideal material for high-quality medical protective equipments. This cloth is also used in working and protective clothes.
Thick SMS products are widely used as high-efficiency filter materials for various gases and liquids. At the same time, they are also high-efficiency oil-absorbing materials. They are used in industrial wastewater degreasing, marine oil cleaning and industrial wipes.
How to Purchase Right Nonwoven Machines ?
You have to consider purchasing nonwoven machines when you decide to invest on nonwoven industry. But you might not know which types of machines you should buy. Let’s take diapers for example to have a better understanding.
The diaper is mainly composed of top sheet, surge layer, absorbent core, leak guard and back sheet. All the parts are nonwoven fabric except absorbent core.
The top sheet should be thin and soft as it directly touches the child’s skin. It requests a hydrophilic treatment and keeps dry. So SSS nonwoven machine and hydrophilic nonwoven machine are good choices.
Surge layer is a little thicker. It sits below the top sheet and above the absorbent core. Its role is to accept the liquid from the top sheet. Then widely distribute the urine to all sections of the absorbent core below as quickly as possible. The surge layer requests a hydrophilic treatment. Therefore, same as the top sheet, I recommend you both SSS nonwoven machine and hydrophilic nonwoven machine.
Leak guard is to prevent side leakage when the baby flips. The SMS fabric has a unique and excellent characteristic of water resistance. It’s essential to buy a SMS nonwoven machine.
As a conclusion, you need to purchase one SSS nonwoven machine, SMS nonwoven machine and one hydrophilic nonwoven machine. It’s a big burden if you just start your business.
Here we suggest you an economical plan. Just purchase one SSMS nonwoven machine and one hydrophilic nonwoven machine. It can do the work of SMS and SSS machines, but less cost. What do you think ?
We have focused on making nonwoven production line for 15 years. We aim to offer customers quality equipments, economical plans and best after-sale service. Don’t hesitate to contact me if you want to know about our machines.