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What is the material of ES hot air cotton for making KN95 masks? 
【 Font Size:L M s 】【PRINT】  DATE:2020/4/30
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As one of KN95 folding mask materials, hot air cotton is not well known to the public. As a new type of mask material, hot air cotton non-woven fabric itself is widely used in N95 folding masks. Recently, ES hot air cotton is heading for hot search headlines, so what is ES hot air cotton? What does it do?


What is ES hot air cotton

Hot air cotton, also known as tuyere cotton, is a new type of thermal insulation material. Hot air cotton is different from spray cotton. Its fixing method is not to use latex but to mix a certain amount of low-melting fiber or ES two-component fiber in the raw materials. After heat drying in the production process, the fibers are sintered immediately, so it also belongs to synthetic fiber filter cotton. one of them.


"ES" in ES hot air cotton is a kind of composite fiber, which is the abbreviation of "Ethylene-Propylene Side BySide" in English, and refers to the name of raw materials. As a new type of heat-bondable composite fiber, ES fiber has been highly evaluated in the world. The "hot air" of the hot air cotton refers to a process in which after the fiber is carded, the hot air on the drying equipment is used to penetrate the web and make it bond to the non-woven fabric.



Technical parameters of hot air cotton

Product name: ES hot air cotton

Alias: mask cotton, ES fiber cotton, filter cotton

Material: polyester fiber, low melting point fiber

Production specifications: 15-120g / ㎡ (N95 masks generally use 30-60 g / ㎡)

Thickness: 1mm ~ 3mm

Width: 16-28cm (customizable)

Color: pure white

Packaging: The conventional packaging is made of plastic bags into rolls, 50M or 100M / roll, and can also be customized according to customer requirements.

Characteristics: It is soft, hygroscopic, non-dissolving, non-toxic, naturally degradable, warm and filtering.

Product certification: EU environmental protection-ROHS

Application areas: mainly used in the fields of filtration, thermal insulation, noise reduction and filling.



Features of ES hot air cotton

When the carded fiber web is thermally bonded by hot-rolling or hot-air penetration, the low-melting-point component forms a fusion bond at the intersection of the fibers. After cooling, the non-cross-point fibers still maintain the original state. This is a form of "point bonding" instead of "zone bonding", so the product has the following characteristics:

1. Pure white, fluffy, soft touch, good elasticity, strong heat retention, good moisture absorption and breathability.

2. Using natural flame-retardant fiber, and no dripping phenomenon. With permanent self-extinguishing effect.

3. A dense carbonized layer is formed during combustion. And low carbon dioxide content, only a small amount of non-toxic smoke.

4. Stable anti-acid and anti-alkali, non-toxic, does not produce any chemical effect. The product is naturally degradable and meets environmental protection requirements.

5. Disadvantages of hot air cotton: low strength, easy to deform.



ES hot air cotton production process

Hot air cotton production process: cotton blending-opening-feeding-pre-carding-laying-main carding-hot air drying-rolling-cutting

Blended cotton: mix all kinds of fibers, mixed fibers;

Initial opening: The mixed raw materials are transported to the pre-opening machine for preliminary opening and loosening;

Fine opening: The fiber raw materials planned by the pre-opening machine are finely opened here, so that the curled fibers are all stretched out for carding;

Cotton collection: The air duct conveys the finely opened raw materials to the cotton collection machine, where the raw materials after opening are fluffy and soft;

Carding: The cotton collecting machine sends the finely opened doll cotton to the carding machine, and the carding machine spreads the fiber into a net shape;

Net laying: Carded cotton is laid into the specified width and thickness according to the parameters;

Hot pressing: The cotton laid in a net shape is pressed to the specified thickness according to the specified parameters, and the fibers are initially shaped into the oven, and the hot pressing is completed;

Stereotypes: After hot pressing, the fibers are pressed to the specified thickness after high temperature sterilization according to the specified parameters. (The two steps of hot pressing and setting are slightly different from the needling process, pay attention to distinguish)

Trimming: According to the specified parameters, the environmentally friendly resin cotton is cut into the prescribed width or sheet specifications, the goods are packaged, and the production is completed.



Application of ES hot air cotton

ES hot air non-woven fabric can be used in various fields according to the density, and the general thickness is used for KN95 protective masks, baby diapers, adult incontinence pads, women's hygiene products, and napkins, bath towels, disposable tablecloths, etc .; thick products are used to make Winter clothes, bedding, baby sleeping bags, mattresses, sofa cushions, etc. High-density hot-melt adhesive products can be used to make filter materials, sound insulation materials, shock absorption materials, etc.


Can ES hot air cotton replace meltblown cloth

1 ton of hot air cotton has no protective cloth, and can make about 600,000 KN95 and N95 folding masks.

Due to the increased demand for masks, one of the raw materials required for the production of masks-meltblown cloth is also very scarce. Since the supply of meltblown cloth is so tight, can it be replaced by a hot air cotton with a filtering mask?

Everyone knows that "melt-blown cloth", an important raw material for the production of masks, is commonly known as the "heart" of masks. It has good filterability, shielding property, heat insulation and oil absorption. It can filter out viruses attached to body fluids. It mainly plays a filtering role in KN95 masks and is an indispensable mask filter material.


The hot-air cotton non-woven fabric, also known as filter cotton, has a filtration effect that only achieves the initial effect of filtration. Therefore, it cannot replace the melt-blown fabric. Since hot air cotton non-woven fabric cannot replace melt-blown fabric, what role does it play in KN95 mask? Is it indispensable material?

The hot air cotton non-woven fabric is a kind of filling material in the KN95 mask. It takes into account the effect of warmth and protection. It adopts a hot air cotton non-woven fabric with high bulkiness, good elasticity, soft feel, strong warmth, good breathability and water permeability. Folding the middle of the mask, it mainly plays the role of heat insulation, moisture and moisture resistance, and improves the wearer's comfort.

Although hot-air cotton non-woven fabrics cannot replace melt-blown fabrics, both are KN95 mask materials and are indispensable.


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