Sibel Kaplan

A Multicriteria Decision Aid Approach on Navel Selection Problem for Rotor Spinning

In studies about optimization of rotor spinning machine parameters, generally classical statistical methods have been used; the priorities and preferences of the yarn producer about yarn properties to get the desired end product characteristics have not been taken into consideration. However, machine part selection from possible alternatives with different properties and performance levels about yarn quality is a difficult task and inherently a multicriteria decision-making problem. In this study, it is proved that application of a multicriteria decision aid method, ELECTRE III, can provide valuable assistance in reaching acceptable solutions in order to select the appropriate navel for Ne 12 rotor yarn spun to weave denim fabric. In experimental part of the study, Ne 12 rotor yarns were spun by using ten navels having different technical properties and their quality parameters were analysed with ELECTRE III.

A new dynamic sweating hotplate system for steady-state and dynamic thermal comfort measurements

This paper discusses design details and measurement principles of a dynamic sweating hotplate system used for both steady-state thermal and water vapor resistance and dynamic water vapor transmission rate measurements. Dynamic and steady-state transfer measurements were carried out by separate systems in preceding studies. Water vapor resistance and dynamic water vapor transmission rate values were determined according to the new principles put forward in this study. Relationships between properties obtained by the new system and standard permeability (water vapor and air) parameters were determined for different types of fabrics used for sports clothing. The materials and physical/constructional properties of the investigated fabrics varied in a wide range as the aim was to determine if the developed system could differentiate their comfort performances. According to the results, water vapor resistance is significantly correlated with fabric weight and water vapor resistance is the best in differentiating the water vapor permeability characteristics of the fabrics among other transfer properties.

An investigation about comfort and protection performances of disposable and reusable surgical gowns by objective and subjective measurements

This study was conducted to investigate comfort and microbial protection performances of two reusable and two disposable surgical gowns by subjective wear trials conducted on eight healthy Dentistry faculty students under environmental conditions suitable for a surgical operation. Protection performances of the gowns were tested by a modified bacterial resistance test. Physiological and psychological data were obtained during wear trials. All objective and subjective results were evaluated in the light of standard physical, mechanical, permeability, and resistance (thermal and water vapor) characteristics of the fabrics. According to the results, thermal comfort performance of the woven gown produced from microfiber polyester was the best according to subjective wear trial and microbial resistance test results. Disposable nonwoven gowns had lower comfort performances despite their higher permeability and lower resistance values. Moreover, chest skin temperature, arm microclimate temperature, and arm relative humidity are the physiological parameters significantly correlated with subjective comfort evaluation results.

Production and performance analysis of an antibacterial foot sweat pad

An antibacterial foot sweat pad was designed and produced by using materials of standard disposable absorbent hygienic products. Topsheet layer of the pad was modified by two volatile oils; cinnamaldehyde and geraniol and a standard zinc-based synthetic antibacterial agent. Physical properties of the sweat pad was arranged according to the sweat disposal amount and dimensions of a foot. Besides antibacterial performance of the topsheet layer of the pad, surface characteristics (friction test), bending rigidity of the modified topsheet layer, liquid absorption and transfer characteristics of the pad were also investigated. Subjective forearm test was conducted to determine effects of antibacterial coating materials on coolness and dampness to touch sensations created by the pads in dry and wet forms. According to the results, cinnamaldehyde created maximum antibacterial activity, which is better than the commonly used synthetic agent, on topsheet layer of the pads and geraniol had an acceptable performance. But cinnamaldehyde treated topsheet fabric became stiffer, rougher and its liquid absorption characteristics deteriorated significantly. Zinc-based synthetic antibacterial agent created higher coolness and dampness sensations during skin contact according to forearm test results.

Navel selection for rotor spinning denim fabrics using a multi-criteria decision-making process

Selection of navel rotor spinning machine, which influences various quality parameters of the final yarn, is a multi-criteria decision-making (MCDM) problem. Different statistical methods have been used in the past to address such kinds of problems. In this work, a suitable navel for denim fabrics was selected by combining two popular MCDM approaches namely, technique for order preference by similarity to ideal solutions (TOPSIS) and analytic hierarchy process (AHP). Ten navels were considered and their performances were evaluated on the basis of seven quality parameters of the produced rotor yarns (50 tex). Relative importance of the yarn quality parameters was evaluated by using AHP method, keeping in mind the requirements of denim fabric. The final ranking of navels was elicited in accordance with the relative closeness value determined by TOPSIS method.

Forearm test for disposable antibacterial foot sweat pads

Purpose – The purpose of this paper is to obtain thermal sensations arise during skin-antibacterial modified foot sweat pad contact by subjective forearm test carried out on 14 males. Design/methodology/approach – Sweat pads were designed for the foot and topsheet layers, constituting of polypropylene (PP) or polylactic acid (PLA) nonwoven fabrics, were modified by herbal antibacterial agents (cinnamaldehyde, geraniol, phenylethyl alcohol). Antibacterial agents were applied directly or within polymers which prepared by three different polymerization methods. Dry and wet pads (including water 50 percent of absorption capacity) were placed on the forearms of the subjects for a constant period under controlled environmental conditions. Liquid absorption and transfer characteristics of the topsheet layers were measured by standard methods (drop, absorption capacity, wetback tests) and moisture management tester parameters. Subjective coolness and dampness sensations arise during first touch of the pads were g...

Objective and subjective performance evaluations of wet wipes including herbal components

In this study, wet wipes were produced for body applications with nonwoven fabrics consisting of polyester and cellulose (viscose and Tencel®). Fabrics were wetted by natural-based wetting solutions (rose water, olive oil) which were functionalized by sodium alginate and natural antibacterial agents (cinnamaldehyde and geraniol) without preservatives. Besides physical characteristics (weight, thickness, porosity, fiber orientation), bending rigidity, Handle-O-Meter measurements, and moisture management test parameters of the nonwoven fabrics were determined. Subjective hand and wiping performances of produced wipes were determined by subjective evaluations carried out on 10 female subjects. According to the results, 100% Tencel® and its blend with viscose have good absorption and moderate transfer characteristics. Polyester content up to 60% is acceptable for wet wipes for the body according to their liquid absorption, transfer, and subjective evaluation results if fabric weight is sufficient. Among the functionalized wetting solutions, antibacterial performance of the solution including olive oil, sodium alginate and cinnamaldehyde was the maximum and it has acceptable hand values according to objective Handle-O-Meter results and subjective evaluation results.

Thermomechanical and Shape Memory Performances of Thermo-sensitive Polyurethane Fibers

This study is the first step to investigate usability of shape memory polyurethane (SMPU) fibers for smart garment applications. SMPU fibers were spun by wet spinning process and chemical/mechanical characterization was carried out. SMPU solutions were prepared with two different concentrations (20 % and 25 %) and three different coagulation bath concentrations (0 %, 1 % and 3 %) were used for determining optimum spinning parameters. For investigating influences of spinning process on crystal structure, mechanical, thermal and shape memory performances of fibers, X-ray diffraction (XRD), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), scanning electron microscopy (SEM) and mechanical tests were conducted. DSC and DMA analysis results show that shape memory polyurethane fibers have a glass transition temperature about 35-40 oC which is suitable for body temperature. Moreover, SMPU fibers showed good tensile performance with an average tenacity of 1.38 cN/dtex and elongation at break of 350 %. Thermo mechanical test results showed that, all shape memory fibers have good shape memory effect with recovery and fixity ratios up to 91 % and 71 % respectively.

Subjective wear trials to evaluate thermal comfort of the foot clothing system including a sweat pad

Abstract Subjective wear trials were conducted to evaluate effects of disposable antibacterial sweat pads on foot thermal comfort. Sweat pads were produced with polypropylene and polylactic acid nonwoven topsheet layers which were treated with different herbal antibacterial materials. Trials were carried out with 10 male subjects under 10 °C and 50% relative humidity simulating sweating during a moderate activity in cold environments. Besides microclimate temperature and relative humidity measurements, subjective thermal (coolness, dampness, and comfort) and other sensations (stickiness, slippiness, etc.) were obtained by five point rating scales. Bending rigidity, friction coefficients, and moisture management properties of the topsheet fabrics and pads were tested. Results show that foot sweat pads enabled drier microclimate, warmer sensations, and higher comfort evaluations. Antibacterial treatments did not affect bending rigidity values of the nonwoven topsheet fabrics, but some applications decreased spreading speed, increased roughness of the pad surfaces, and wetting time values which are not preferable.

Basınç Konfor Performasını Etkileyen Parametreler ve Basınç Konforunun Ölçümü

Gunumuz tuketicileri, psikolojik ve fizyolojik acidan kendilerini tatmin edebilecek konfor performansina sahip ve fonksiyonel giysiler arzu etmektedir. Kumas ozellikleri, giysi boyutlari, vucuda oturmasi ve bunlara bagli olarak olusan basinc konforu, kisilerin oncelikli beklentileri arasinda tanimlanmistir. Giysi isi ve rutubet transferi acisindan ne kadar iyi dizayn edilmis olursa olsun, eger vucuda serbest hareket imkani saglamiyorsa konforlu olarak tanimlanmayabilir. Bu makalede, materyal, kumas yapisal parametreleri, mekanik ozellikler ve giysi modelinin basinc konforuna etkileri ve basinc konforunun olcumu konularinda ilgili literatur isiginda bilgiler verilmektedir.