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Three methods of non-woven fabric manufacturers (1)

by:XINYU Non-woven     2022-02-27

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

I. 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 bulkiness, web uniformity and surface coverage.

The spunbond method combines fiber spinning technology and non-woven forming technology, using 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, forming continuous filaments with high strength and stable performance. After the filaments are separated into 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 passed through the subsequent reinforcement device, after hot rolling reinforcement, needle punch reinforcement or spunlace plus fixed type, and then coiled by the coiling device to obtain the product. Among the key steps are melt spinning, as-spun fiber air drawing, fiber web formation and web setting.

1. Melt spinning

The raw materials must be pre-dried to prevent degradation during high temperature heating and melting, especially to prevent moisture from vaporizing at high temperatures to form 'bubble fibersThe formation of filaments or broken ends will affect product quality and normal production. The control of the spinning process is mainly carried out from the following aspects.

Spinning temperature control: mainly 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 to extrude the melt and 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, resulting in the appearance of filaments and affecting the quality of the non-woven fabric.

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