In order to make a contribution to the reduction of raw material costs, in the present study the effect of reused cotton fibres on the quality of conventional ring and OE-rotor yarns was investigated. In the yarn production, it three different waste fibres were taken from a cotton yarn production line and blended with primary cotton fibres at five different levels varying from 5% to 40%. In literature, studies have concentrated on the usage of recovered waste fibre in OE-rotor yarn production. However, to date there has been limited extensive and comparative research on the effect of recovered fibre quality on different yarn properties to determine the possibility of high-quality yarn production from reused fibres. In the study, we focused on the effect of different waste types as well as the amount of waste in the blends on the properties of different yarn types.

Biodegradable and sustainable products are being employed to make contributions to efforts concerning environmental protection and the reduction of oil consumption. Biodegradable fibres present a simple and notable opportunity for providing sustainable textiles. Soybean fibre is a kind of regenerated and new-generation protein plant fibre. The present work aimed to analyse the many different properties of soybean fibres. Particularly it was focused on their performance, functional, comfort and dyeing properties. In literature, there are studies regarding soybean fibres but topics mostly involved the analysis of comfort properties of the fibre. In this study, fibre structure and composition, flame and UV resistance, strength, pilling behaviour, air and water vapour permeability, water absorption, drape and dyeing properties were studied. It was indicated that soybean fibre is capable of meeting the performance, comfort and functional requirements of classical and technical textile products. The fibre has many of the good qualities of natural fibres such as tenacity, moisture regain, soft-lustrous handle, dyeability and colour fastness properties, and also has some of the functional properties of synthetic fibres such as being flame retardant and anti-ultraviolet.

Nowadays, there are many studies regarding with nanocomposite production including nano particles which aimed to gain many properties such as better strength, self-cleaning, and resistance to flammability into synthetic polymers. In nanocomposite production, the materials like clay, silica, metal oxides such as TiO2, Al2O3 are used. In present study, three different organically modified montmorillonite (MMT) clays of Cloisite 10A, 15A and 30B (3%) were added into polyethylene terephthalate (PET) polymer. Nanoclay and PET polymer were combined with melt blending method in terms of twin screw extruder. Internal and morphological properties of PET/clay nanocomposites were analyzed with scanning electron microscopy (SEM) images and XRD curves. And also, chemical and thermal properties of nanocomposite samples were studied. The findings and results of nanocomposites were compared with that of PET polymer. At the end of the study, the changes in PET polymer and the effect of clay type on material properties were determined.