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What exactly is meltblown non-woven fabric

by:XINYU Non-woven     2022-01-20

The meltblown cloth mainly uses polypropylene as the main raw material, and the fiber diameter can reach 1-5 microns. With many voids, fluffy structure and good wrinkle resistance, these ultra-fine fibers with unique capillary structure increase the number and surface area of u200bu200bfibers per unit area, so that the meltblown cloth has good filterability, shielding, heat insulation and oil absorption. . It can be used in air, liquid filter materials, isolation materials, absorbing materials, mask materials, thermal insulation materials, oil absorbing materials and wiping cloths and other fields.

The process of melt-blown non-woven fabrics: polymer feeding---melt extrusion---fiber formation---fiber cooling---web formation---reinforcement into cloth.

Scope of application

(1) Medical and sanitary cloths: surgical gowns, protective clothing, sterile wraps, masks, diapers, women's sanitary napkins, etc.;

(2) Home decoration fabrics: wall coverings, tablecloths, bed sheets, bedspreads, etc.;

(3) Clothing fabrics: linings, adhesive linings, flakes, shaped cotton, various synthetic leathers Base cloth, etc.;

(4) Industrial cloth: filter material, insulating material, cement packaging bag, geotextile, wrapping cloth, etc.;

(5) Agricultural cloth: Crop protection cloth, seedling raising cloth, irrigation cloth, thermal insulation curtain, etc.;

(6) Others: space cotton, thermal insulation and sound insulation materials, linoleum felt, cigarette filters, tea bags, etc.

Meltblown cloth can be called the 'heart' of medical surgical masks and N95 masks.

Medical surgical masks and N95 masks generally adopt a multi-layer structure, referred to as SMS structure: a single-layer spunbond layer (S) on both sides of the inner and outer sides; a melt-blown layer (M) in the middle, generally divided into Single or multi-layer.

Flat masks are generally PP spunbond + meltblown + PP spunbond, or one layer of staple fiber can be used to improve skin touch. Three-dimensional cup masks are generally PET polyester needle-punched cotton + meltblown + needle-punched cotton or PP spunbond. Among them, the outer layer is a non-woven fabric with waterproof treatment, which is mainly used to isolate the droplets sprayed by the patient; the middle melt-blown layer is a specially-treated melt-blown non-woven fabric, which has good filtering and shielding properties. , heat insulation and oil absorption, are important raw materials for the production of masks; the inner layer is ordinary non-woven fabrics.

Although the spunbond layer (S) and meltblown layer (M) of the mask are both non-woven fabrics, and the raw materials are polypropylene, the production process is different.

Among them, the fiber diameter of the spunbond layer on the inner and outer sides is relatively thick, about 20 microns; the fiber diameter of the meltblown layer in the middle is only 2 microns, which is made of a polypropylene material called high-melt fat fiber. production.

China is the world's largest producer of non-woven fabrics. In 2018, the production volume of non-woven fabrics was about 5.94 million tons, but the output of melt-blown non-woven fabrics was very low.

According to the statistics of China Industrial Textiles Industry Association, the production process of China's nonwovens industry is mainly spunbond. In 2018, the output of spunbond nonwovens was 2.9712 million tons, accounting for 50% of the total output of nonwovens, mainly used in sanitary materials and other fields; the meltblown process accounted for only 0.9%.

Based on this calculation, in 2018, the domestic output of meltblown nonwovens was 53,500 tons/year. These meltblown cloths are not only used for masks, but also for environmental protection materials, clothing materials, battery separator materials, wiping materials, etc.

Under the epidemic, the demand for masks has increased significantly. According to the data of the fourth national economic census, the total employed population of domestic legal entities and self-employed households is as high as 533 million. Calculated based on one mask per person per day, at least 533 million masks are needed per day.

Data from the Ministry of Industry and Information Technology shows that currently, the maximum daily production capacity of domestic masks is 20 million.

There is a huge gap in masks, and many companies have begun to produce masks across borders. According to the data from Tianyancha, based on the change of industrial and commercial registration information, from January 1 to February 7, 2020, more than 3,000 enterprises across the country have added 'masks, protective clothing, disinfectants, thermometers, medical Equipment' etc.

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