Experimental and statistical analysis of the properties of polyester/viscose blended nonwovens produced by needle punching method.

TEZ8012Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2010.Kaynakça (s. 265-272) var.xviii, 273 s. : res. ; 29 cm.In this study, it is aimed to develop statistical models in order to predict the physical and performance properties of polyester/viscose blended needle punched nonwovens before fabric production. For this purpose, five different blend ratios of polyester/viscose webs were produced and these webs were cross lapped, needle-punched in four different mass per unit area and punch density. Total number of nonwovens produced with different production parameters were sixty. The physical and performance properties of the fabrics such as thickness, density, air permeability, bursting strength, absorption capacity, abrasion resistance, dry and wet tenacity/elongation were determined with related test standard methods and equipments. The results obtained from tests were statistically analyzed in Design Expert software and statistical models were developed for each fabric property. Simplex lattice design was applied during construction of mixture x process crossed models. The prediction of nonwoven physical and performance properties could be provided with the regression equations obtained from developed models. Additionally, the relation between process parameters such as blend ratio, mass per unit area, punch density and physical/performance properties of nonwovens has been investigated.Bu çalışmada polyester/viskon karışımından iğnelemeyle üretilen dokusuz yüzeylerin fiziksel ve performans özelliklerinin değerlendirilmesi ve üretime geçilmeden tahmin edilmesine yönelik istatistiksel modellerin kurulması amaçlanmıştır. Bu amaçla; beş farklı karışım oranında, dört farklı gramajda hazırlanan tülbentler üç farklı iğneleme yoğunluğunda sabitlenerek 60 adet farklı dokusuz yüzey elde edilmiştir. Söz konusu dokusuz kumaşların gramaj, kalınlık, yoğunluk, hava geçirgenliği, patlama mukavemeti, aşınma dayanımı, sıvı emme kapasitesi, kuru/ıslak kopma mukavemeti ve kopma uzaması gibi fiziksel ve performans özellikleri standart test yöntemleri ve cihazlarıyla tespit edilmiştir. Testler sonucu elde edilen veriler Design Expert 6.06 paket programı kullanılarak istatistiksel olarak analiz edilmiş, her özellik için istatistiksel modeller kurulmuştur. İstatistiksel modellerin oluşturulmasında simpleks kafes tasarım uygulanmış, karışım X proses çapraz modeller geliştirilmiştir. Modellerden elde edilen regresyon denklemleriyle dokusuz kumaş özelliklerinin tahmin edilebilmesi sağlanmıştır. Ayrıca; karışım oranı, kumaş gramajı, iğneleme yoğunluğu gibi seçilen değişkenler ile kumaşların fiziksel ve performans özelliklerin değişimi irdelenmiştir.Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi tarafından desteklenmiştir. Proje No: MMF2006D33

An analysis on abrasion resistance of polyester-/viscose-blended needle-punched nonwovens

In this study, the influence of fiber composition and process parameters such as mass per unit area and punching density on abrasion resistance of polyester-/viscose-blended needle-punched nonwovens has been investigated. For this purpose, five different blend ratios of polyester/viscose webs were produced, cross-lapped, and needled in four different mass per unit areas and three different needling/punching densities. The abrasion resistance and thickness of the nonwovens were determined by performing the standard test methods. The structural parameters such as fabric bulk density and fiber volume fraction were calculated and the data obtained from tests and calculations were analyzed in detail. It was concluded that abrasion resistance of the needle-punched nonwovens decreased with the increase of polyester proportion in the mixture and increased with the increase in mass per unit area. Also, an increase in punching density first caused to increase in abrasion resistance and then further increase in punching density decreased the abrasion resistance.In this study the influence of fiber composition and process parameters such as mass per unit area and punching density on abrasion resistance of polyester/viscose blended needle-punched nonwovens has been investigated. For this purpose, five different blend ratios of polyester/viscose webs were produced, cross-lapped and needled in four different mass per unit areas and three different needling/punching densities. The abrasion resistance and thickness of the nonwovens were determined by performing the standard test methods. The structural parameters such as fabric bulk density and fiber volume fraction (FVF) were calculated and the data obtained from tests and calculations were analyzed in detail. It was concluded that abrasion resistance of the needle-punched nonwovens decreased with the increase of polyester proportion in the mixture and increased with the increase in mass per unit area. Also, an increase in punching density first caused to increase in abrasion resistance and then further increase in punching density decreased the abrasion resistance