در سال محققان دریافتند البسه ی حاوی لایکرا زیست سازگار نبوده و مشکلات زیست محیطی زیادی به همراه دارند. تاثیر منفی این الیاف بیشتر از سایر الیاف مصنوعی است.. الیاف مصنوعی دیگری نظیر نایلون از منابعی مانند نفت یا ذغال سنگ تهیه میشوند اما الاستان به صورت کامل در آزمایشگاه سنتز میشود. اگر برای تولید آن از منابع تجدیدپذیر است.فاده شود، مشکلات زیست محیطی آن کمتر خواهد شد.

Like other manmade fibers, polyester fibers are produced using industrial methods and because of their properties are good substitutes for such natural fibers as cotton. This product is made by combining dimethyl terephthalate, monoethylene glycol or terephthalic acid (substitute for the raw material &#;dimethyl terephthalate&#;) in the vicinity of good catalysts. Titanium dioxide is used to make the product look semi-dull. Also, in the production process, the product is submerged in finish (of about .%) prior to packaging. The following are some of the major characteristics of this product.

دستگاه های جوش چرخشی- اصطکاکی شرکت KLN و Mecasonic مجهز به سروو موتور و تکنیک های مدرن کنترل بوده و بالاترین دقت و کارایی را در جوش قطعات با سطح مقطع دایره ای و متقارن ارائه می دهد. شرکت میلاد فراصوت همکاری نزدیکی با دو شرکت KLN آلمان و Mecsonic فرانسه داشته و آماده خدمت رسانی در زمینه تامین انواع تجهیزات جوش چرخشی می باشد.

Our acrylic fibers are produced using monomer acrylonitrile as the major monomer (over %), methylacrylate or vinyl acetate as the second comonomer (less than %) and a third comonomer for dyability, by Solution Polymerization and Wet Spinning using SNIA technology. In both dull and semi-dull product, Titanium Dioxide (max .%) is used. Also, in the process of production, the fibers are submerged in finish (finish of about .%) prior to packing. The following are some of the major characteristics of our products:

The advantage of Slurry Polymerization is its high flexibility such that the speed of polymerization is about times that of Solution Polymerization and of a good efficiency. The presence of water in the reactive medium minimizes the difficulty of using the solvent. The polymer thus obtained possesses a higher molecular weight and a narrower PDI, improving the physical and mechanical properties of fibers, failure (=break) resistance (good tenacity and elongation) included. Of the unique benefits of the polymerization is the possibility to synthesize polymer without using dyable comonomer while the polymer obtained is capable of being chemically dyed. Of the advantages of Dry Spinning, reference can be made to the presence of microvoids in the fiber structure and its low porosity which improve its luster and make it feel much better. For this reason, too, the fiber longevity improves. Absence of microvoids makes fibers take longer to get dirty and faster to clean when washed. One characteristic of fibers produced by Dry Spinning is the Dog-Bone cross-sectional area. This characteristic adds considerably more to the tenacity and strength of the yarn produced than when other methods are used such that acrylic fibers can be used conveniently in high-speed carpet-weaving machines. Furthermore, owning to this very characteristic, the fiber resilience will increase. This characteristic is particularly important in manufacturing such products as carpets which are constantly subjected to compressive strength which when withdrawn returns to their original standing position. These characteristics have made Dry-Spinning fibers more valuable than fibers produced by other methods.  Produced in the spinning cells, the fibers are washed and then drawn proportionately to improve their mechanical properties. To make manmade fibers look like natural fibers, they are crimped and then cut to customized lengths. Next, they are heat-treated where they are fixed and dried. Finally, the product is packaged in covered polypropylene jutes and rod guards in bales weighing ± kg.