AI Summary & Key Takeaways
AI InsightThe EMSE values at 30 MHz of the fabric samples knitted by the produced bicomponent yarns were measured as 18,78 dB and 13,59 dB for tight and loose stitch densities, respectively
📌 3 Key Takeaways
Abstract
In this study, multifilament polyester yarns consist of bicomponent S/C (sheath/ core) fibres were produced in order to create electromagnetic shielding properties. Yarns were produced in 260 dtex linear density with 72 bicomponent filaments. The conductive additive material was nano iron oxide 20% (w/w) in PBT (polybutylene terephthalate) masterbatch.1, 2 and 3% masterbatch (20% nano iron oxide in PBT) were fed into the sample yarn production device, however; acceptable yarn production could only be achieved by 1% masterbatch due to the high number of machine stops at higher amounts of additive material. Shrinkage at the boil and tenacity tests were performed on the produced yarns. Also, the produced yarns were knit to form fabrics and test the EMSE (electromagnetic shielding efficiency) values by these knitted surfaces. The EMSE tests on the knitted fabric samples were performed basically according to ASTM D 4935 Coaxial Holder Method but the method used was a modified method that uses a smaller sample holder. The EMSE values at 30 MHz of the fabric samples knitted by the produced bicomponent yarns were measured as 18,78 dB and 13,59 dB for tight and loose stitch densities, respectively
Özet
Bu çalışmada elektromanyetik radyasyondan korunma amaçlı multifilament S/C (sheath/ core) katkılı bikomponent poliester iplik üretimi gerçekleştirilmiştir. İplikler 260 dtex 72 filament olarak elde edilmiştir. Katkı malzemesi öncelikle taşıyıcı malzeme olarak PBT kullanılarak %20 nano demiroksit ile masterbatch şeklinde hazırlanmıştır. Bikomponent lifin merkezinde katkı malzemesi olarak % 20’liknanodemiroksit/ PBT masterbatch%1 oranında kullanılmıştır. %2 ve %3 oranları da denenmiş fakat akıştaki bozukluk ve kopukluklardan dolayı üretim yapılamamıştır. Üretilen ipliklere kaynama çekmesi ve mukavemet testleri yapılmıştır. Elde edilen ipliklerle iki farklı sıklıkta örme kumaş üretilmiştir. Üretilen kumaşların EMR koruma etkinliği araştırılmış30 MHz’ de % 1 demiroksit katkılı kumaşın ekranlama etkinliği daha sık olan kumaşta 18,78 dB iken, daha seyrek kumaşta 13,59 olarak ölçülmüştür