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El procés de filatura de fusió de fil de Spandex

Temps: 2021-08-09 Comentari: 29


Dry spinning is the most traditional and common way of producing spandex. However, one of the major drawbacks of this method is the heavy investment required in construction of a commercial-scale production plant of, for example, 3000 to 5000 tons per year. At a 40-denier average, the overall investment is in the range of US$ 40 million to US$ 50 million which is quite high. Moreover, dry spinning also involves dealing with a toxic solvent recovery process and, in the dry process, the solvent remain in the final yarn. In the melt spinning method, no solvent is involved.

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Melt Spinning: A competitive New Process
The melt-spinning process used for production of synthetic fibers such as polyamides, polyester and others is a well-established and long-existing technology in the industry.
In recent years, very low-cost melt-spinning equipment has been developed and is offered today in Asia for a price that is 20% of that of a dry plant of equivalent production capacity. This new process attracted many newcomers into the spandex production field.

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In addition, recent developments brought more adequate TPU polymers and the introduction of pre-polymer into the melt stream of TPU to improve the elastic characteristics of the produced yarns. All these developments have further pushed this process forward.
For the above reasons, a lot of attention has been given to equipment, raw materials and technology to further improve the melt-spinning process for spandex.

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