Wyniki wyszukiwania - Biblioteka Nauki

1

Effect of Air Gap Entrapped in Firefighter Protective Clothing on Thermal Resistance and Evaporative Resistance

100%

He H. , Yu Z.

Autex Research Journal

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2018

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tom Vol. 18, no. 1

28--34

EN

Heat and water vapor transfer behavior of thermal protective clothing is greatly influenced by the air gap entrapped in multilayer fabric system. In this study, a sweating hot plate method was used to investigate the effect of air gap position and size on thermal resistance and evaporative resistance of firefighter clothing under a range of ambient temperature and humidity. Results indicated that the presence of air gap in multilayer fabric system decreased heat and water vapor transfer abilities under normal wear. Moreover, the air gap position slightly influenced the thermal and evaporative performances of the firefighter clothing. In this study, the multilayer fabric system obtained the highest thermal resistance, when the air space was located at position B. Furthermore, the effect of ambient temperature on heat and water vapor transfer properties of the multilayer fabric system was also investigated in the presence of a specific air gap. It was indicated that ambient temperature did not influence the evaporative resistance of thermal protective clothing. A thermographic image was used to test the surface temperature of multilayer fabric system when an air gap was incorporated. These results suggested that a certain air gap entrapped in thermal protective clothing system could affect wear comfort.

2

A Study of the Thermal Properties of Textured Knitted Fabrics

100%

Özçelik G. , Çay A. , Kirtay E.

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2007

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tom Vol. 15, no. 1 (60)

55--58

EN

The smooth and compact shape of filament yarns differentiate them from natural fibres, and this regular characteristic of synthetic fibres affects the handle and thermo-physiological properties of the fabrics. The properties of filament yarns are improved by the texturing process, which provides crimp, bulkiness and entangled effects. In this study, the thermo-physiological properties of interlock knitted fabrics produced with air-jet textured, false-twist textured and non-textured filament PES yarns have been compared by using the Alambeta instrument. In addition, the cover factor and air permeability of the fabrics were determined, and the surface characteristics were compared by using scanning electron microscope.

PL

Gładki i zwarty kształt przędz filamentowych odróżnia je od włókien naturalnych. Ta charakterystyczna cecha włókien syntetycznych wpływa na chwyt i termo-fizjologiczne właściwości wyrobów z nich wykonanych. Właściwości przędz filamentowych są polepszane przez teksturowanie, które nadaje efekt skarbikowania, spęcznienia lub spętlenia. Za pomocą aparatu Alambeta porównano termo-fizjologiczne właściwości dzianin interlokowych, wykonanych z filamentowych przędz poliestrowych teksturowanych powietrznie i metodą „nibyskrętu” oraz nieteksturowanych. Ponadto określono współczynnik pokrycia i przepuszczalność powietrza testowanych wyrobów, a także porównano ich właściwości powierzchniowe za pomocą skaningowego mikroskopu elektronowego.

3

Effect of Weave Structure on Thermo-Physiological Properties of Cotton Fabrics

100%

Ahmad S. , Ahmad F. , Afzal A. , Rasheed R. , Mohsin M. , Ahmad N.

Autex Research Journal

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2015

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tom Vol. 15, no. 1

30--34

EN

This paper aims to investigate the relationship between fabric weave structure and its comfort properties. The two basic weave structures and four derivatives for each selected weave structure were studied. Comfort properties, porosity, air permeability and thermal resistance of all the fabric samples were determined. In our research the 1/1 plain weave structure showed the highest thermal resistance making it suitable for cold climatic conditions. The 2/2 matt weave depicted the lowest thermal resistance which makes it appropriate for hot climatic conditions.

4

Approach to Performance Rating of Retroreflective Textile Material Considering Production Technology and Reflector Size

80%

Glombikova V. , Komarkova P. , Vik M. , Adamcova J. , Nemcokova R. , Vikova M. , Havelka A.

Autex Research Journal

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2022

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tom Vol. 22, no. 4

446--457

EN

The study investigates retroreflective fabrics’ efficiency from the point of view of the interaction of their visibility, thermo-physiological comfort properties, and durability (represented by physical-mechanical performance). The effect of the combination of two production technologies (reflective transfer films and screen printing method) and two reflector covering sizes (25% and 85%) was examined. Technique for order of preference by similarity to ideal solution (TOPSIS) method was used to determine the best solution considering the abovementioned tested categories of properties. Retroreflective performance was in congruence with the used design coverage factor of the tested pattern. It was found that retroreflection of the tested pattern produced using screen printing technology was significantly lower than retroreflection of an identical pattern made by a transfer film. On the contrary, in terms of thermo-physiological comfort and physical-mechanical performance of the tested samples, screen printing technology shows significantly better results in almost all tested properties, especially in water vapor permeability, moisture management, and physical-mechanical performance. The solution for the abovementioned contradictory results can be achieved by using a combination of the advantages associated with each of these technology methods. Screen printing can be applied to specific regions of clothing that are exposed to extreme loading or sweating, and the transfer of film elements ensures high visibility with respect to the standards and biomotion principles that are deployed as prevalent benchmarks in the industry.