Dušan Trajković

Predicting the behavior of nonwoven geotextile materials made of polyester and polypropylene fibers

Predicting the behavior of geotextiles made of polyesters and polypropylene fibers is described by differential equations derived from mechanical models. Thereby, we describe the behavior of geotextiles up to the elastic limit. The elastic limit represents the permissible load which the geotextile material may be subjected to during exploitation, and without distorting its structure. The elastic limit is defined by analyzing the stress–strain curve of analyzed geotextiles. Nonwoven geotextile materials of polyester and polypropylene fibers with surface mass of 150, 200, 250, 300 and 500 g/m2 were used as experimental material.

Attitudes towards managing post-industrial apparel cuttings waste

Abstract By its origin, textile waste can be divided in two broad categories: post-consumer waste and post-industrial waste generated during the manufacturing process. The division of the clothing supply chain between developed consumer markets and developing countries where apparel production capacities are outsourced implies that post-consumer waste is present in the former countries, whereas the later generates more post-industrial waste. The purpose of this exploratory study was to determine how the attitudes of top management towards managing apparel cuttings waste influence their willingness to introduce apparel waste sorting. The proclivity to sort apparel cuttings was strongly influenced by two key factors – the ease and costs of introducing sorting operations and impediments to sorting such as lack of workforce, technology or market. Combining these two factors leads towards negative attitudes to introducing apparel sorting. Perception of impediments in the process of sorting leads towards negative attitudes regarding the ease of introducing sorting operations; however, it does not influence adversely the proclivity to sort.

Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process

Trajkovic D, Savic M, Kostic M, Majstorovic D, Stojanovic P, Stepanovic J. Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process. FIBRES & TEXTILES in Eastern Europe 2017; 25, 3(123): 79-85. DOI: 10.5604/12303666.1237241 Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process

The influence of the texturing speed and the degree of stretching on breaking characteristics of the textured PES yarn

Mechanical properties of textured PES yarns depend on their structural characteristics and texturing process parameters. In this work, the results of breaking characteristics of textured PES yarns formed with various technological production parameters are presented. The samples of textured PES yarns were produced on a modern machine with a short heating zone. The textured yarn was formed at the first heater temperatures of 350 °C, 400 °C and 450 °C with the constant temperature of the second heater of 180 °C and with D/Y ratio of 2.20. The texturing speed was changed in the range of 500 m/min up to 1100 m/min with stretching degrees of 1.665, 1.675 and 1.685. The results obtained can be used for the selection of optimal production parameters of PES yarn at various texturing speeds. Also, the relationships which can be applied in industry for predicting breaking characteristics depending on texturing process parameters are presented.

Polyester apparel cutting waste as insulation material

Abstract Polyester waste is the dominant component of the clothing industry waste stream, yet its recycling in this industry is rarely addressed. This paper proposes using polyester cutting waste as an insulation blanket for roofing and buildings’ internal walls in order to reduce environmental pollution. The designed textile structures used waste cuttings from different polyester fabrics without opening the fabric to fibre. Thermal insulation, acoustic insulation, fire resistance and biodegradation of the new insulation structure were investigated and compared to commercial insulation materials. Standard investigation methods were modified to fit the samples voluminous nature. The coefficient of thermal conductivity ranged between 0.0520 and 0.0603 W/mK. The achieved sound absorption with NRC ranging from 54.71 to 74.77%, surpassing standard commercially used insulators. The insulating structure did not conduct flame, the radius of impaired place was 1.60–2 cm while the depth was 0.4–1.3 cm, and showed lack of biodegradability, with loss of mass ranging from 0 to 0.3%.