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How is the mask cloth produced from non-woven manufacturers

by:XINYU Non-woven     2022-03-02

Non-woven fabric refers to an ordered or disordered fibrous non-woven sheet obtained by arranging or spraying the fibers formed by spinning on the substrate and curing and forming in different ways. Nonwovens have the advantages of low cost and wide range of uses.

Let's take a look at how non-woven fabric manufacturers produce non-woven materials for masks.

Spunbonding

Spinning fusion is a widely used one-step spinning process for forming non-woven fabrics. Spunbond nonwovens are formed by continuous filament fibers, which have high production line speed, high product strength, and good dimensional stability, but low porosity, uniformity of web formation, and poor surface coverage.

The spunbond method combines fiber spinning technology and non-woven forming technology, and uses the principle of melt spinning. Extruded to form a thin stream of melt. High-speed quenching air is used to cool the extruded melt stream, and at the same time, the fibers are stretched by the stretching airflow during the cooling process to form continuous filaments with high strength and stable function. After the filaments are divided into filaments to form a uniformly dispersed monofilament structure, they are laid on a mesh curtain with negative pressure to form a non-woven web. The fiber web is then subjected to subsequent reinforcement equipment for hot rolling reinforcement, needle punch reinforcement or spunlace plus fixed type, and then coiled by coiling equipment to obtain the product. The key steps are melt spinning, spun fiber air drawing, fiber web formation and web setting.

Melt spinning

The raw material needs to be pre-dried to prevent degradation when heated and melted at high temperature, especially to prevent moisture from vaporizing at high temperature to form 'bubble yarnWire or broken ends will affect product quality and normal production. The control of the spinning process is mainly carried out from the following aspects.

Control of spinning temperature: mainly to control the temperature of spinning components such as spinnerets. The suitable spinning temperature should make the melt maintain sufficient fluidity, ensure smooth spinning, and high uniformity and spinnability of the melt, so that the subsequent airflow drawing process can be carried out smoothly, and the fiber orientation is high. The spinning temperature is controlled between the melting point and the decomposition temperature. Properly increasing the spinning temperature can improve the melt fluidity.

Control of the spinning melt pressure: mainly to control the pressure of the melt in the spinning box. If the melt pressure is too low, the melt flow will be unevenly distributed on the spinneret, and the diameter of the extruded melt stream will be uneven. If the melt pressure is too high, it is easy to form a spinneret hole and extrude the melt to break.

Control of spinning speed: Spinning speed affects the size and uniformity of fiber linear density, as well as the quality of nonwovens. The spinning speed is too low, and the thin stream of extruded melt is cooled too fast, which leads to easy breaking of the drawing. However, if the spinning speed is too high, the melt stream cannot be cooled in time, which leads to the occurrence of filaments and affects the quality of non-woven fabrics.


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