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What is melt blown cloth?

Release time: 2021-02-05

Views: 66

What is melt blown cloth?

The core material for making masks is melt blown cloth, which is called the "heart" of medical surgical masks and N95 masks. Medical surgical masks and N95 masks usually adopt a multi-s-layer structure, referred to as SMS structure: the inner and outer layers are a single spunbond layer (S); the middle is a meltblown layer (M), which is generally divided into single layer or multiple layers.

Specifically, flat masks are generally PP spunbond + meltblown + PP spunbond, but one layer can also be replaced with staple fibers to improve skin touch. Three-dimensional cup-shaped masks are generally PET polyester needle punched cotton + melt blown + needle punched cotton or PP spunbond.

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Among them, the outer layer is a waterproof non-woven fabric, which is mainly used to replace 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 fabric.

In terms of processing technology, melt blown cloth uses polypropylene and other high molecular weight as raw materials, which is transformed into a non-woven material formed by high-speed hot air blowing to form ultra-fine fibers, and self-bonding under the action of air flow.

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Compared with other types of materials, melt blown cloth fiber is thinner than the length size, which can also better filter, shield, heat insulation and oil absorption. It is used in thermal insulation materials, filter materials, oil-absorbing environmental protection materials, and battery packs. , Sound insulation materials, medical supplies and other fields have a wide range of applications.

At present, there are many domestic manufacturers capable of producing meltblown cloth, and the entire industry is showing a trend of small and scattered. Except for a few large manufacturers whose daily output can exceed 10 tons, the daily production capacity of small manufacturers is 1 ton. , Even less than 1 ton.

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The production principle of melt blown cloth:

Using hot air jets, hot polypropylene is extruded from the pores of the nozzle of the spinneret to extend it in a fibrous shape, and then gather on the conveyor belt to form a fibrous web based on its self-welding property. There are many small nozzles arranged on the spinneret with a diameter of only 0.15 mm. The molten polypropylene stream sprayed from the nozzles is extended by a high-speed air stream and concentrated on a moving conveyor belt to obtain a melt blown cloth.

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