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What problems will be encountered during the production of polyester non woven fabrics?

  • Author:Junqian Nonwoven
  • Source:Junqian Nonwoven
  • Release on:2018-12-25
1. Polyester cotton abnormal fiber types

Answer: During the production of polyester wool, some abnormal fibers are inevitable due to the problems of pre-spinning or post-spinning conditions. Especially the recycled cotton produced by recycling slicing is more likely to produce abnormal fibers. The abnormal fiber outsole can be divided into the following types. ;

(1) Single root: Incompletely extended fibers, which tend to cause abnormal dyeing and have less effect on non-woven fabrics(China Polyester Felt Sheet Factory), but for water-based cloth or needle-punched fabrics for artificial leather fabrics. Has a serious impact.

(2) merging: After stretching, there are two or three fibers sticking together. This kind of fiber is easy to cause abnormal dyeing, and has less influence on non-woven fabrics, but for water needles used in artificial leather fabrics. Cloth or needle cloth has a serious impact.

(3) Colloidal shape: Broken or entangled filaments are generated during the extension, so that the fibers are not extended at all to form hard cotton. The product can be further divided into a first-grade gel, a second gel, and a third-grade gel. Such abnormal fibers are often deposited on the card clothing after the carding process, causing problems such as poor formation of the cotton web or broken net. Such raw materials may cause serious quality defects for most of the non-woven fabrics.

(4) Oil-free cotton: During the extension period, there is no oil on the fiber during the period of unsatisfactory driving. The fiber usually has a dry feel. In addition to causing static electricity generated in the non-woven fabric production process, it also causes the semi-finished product to be finished. problem.

(5) The above four kinds of abnormal fibers, single root and merging are difficult to be removed during the production of non-woven fabrics(Needle Punched Felt Fabric Wholesale). Colloidal and non-oiled cotton can be removed as long as the production personnel pay a little attention to reduce the defects of product quality.

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2. the reasons affecting the flame retardancy of non-woven fabrics(Polyester Felt Manufacturer)

Answer: The reasons for the non-flammable effect of polyester wool are as follows:

(1) Conventional polyester cotton has an oxygen-limited index of 20-22 (the oxygen concentration in the air is 21%), which is a kind of combustible fiber, which is easy to ignite but has a slow burning speed.

(2) If the polyester slice is modified and denatured, it has a flame retardant effect. Long-acting flame-retardant fibers mostly use denatured polyester chips to produce flame-retardant polyester wool. The main modifier is a phosphorus series compound. Phosphorus is combined with high-heat and air oxygen to reduce the oxygen content. Flame retardant effect.

(3) Another method for making polyester wool flame-retardant is the surface treatment method, which considers that the treatment agent reduces the flame retardant effect after repeated processing.

(4) Polyester cotton has the characteristics of shrinking when it encounters high heat. When the fiber encounters the flame, it is not easy to ignite due to shrinkage and is separated from the flame, resulting in appropriate flame retardant effect.

(5) Polyester cotton has molten sag when it encounters high heat, and the molten drip phenomenon produced by the cotton wool after ignition can also take away part of it.

Heat and flame produce a suitable flame retardant effect.

(6) If the fiber is stained with easily flammable grease or silicone oil that can be used to shape the polyester cotton, the polyester wool will reduce the flame retardant effect. In particular, when a polyester wool containing SILICONE oil is exposed to a flame, the fiber cannot be shrunk and burned.

(7) Increasing the flame retardant effect of polyester cotton, in addition to the use of flame-retardant polyester chips to produce polyester wool, the use of a higher phosphate component on the fiber surface for post-treatment can also increase the flame retardant effect of the fiber. . Phosphorus molecules that are exposed to high heat in phosphates combine with oxygen molecules in the air to reduce the oxygen content in the air, thereby increasing the flame retardant properties.