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

Glombikova Viera, Komarkova Petra, Vik Michal, Adamcova Jaroslava, Nemcokova Renata, Vikova Martina, Havelka Antonin

Autex Research Journal

2022

Vol. 22, no. 4

446--457

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.

Photochromic Polypropylene Filaments: Impacts of Mechanical Properties on Kinetic Behaviour

Periyasamy Aravin Prince, Viková Martina, Vik Michal

Fibres & Textiles in Eastern Europe

2019

Vol. 27, no. 3 (135)

19--25

Spiro [2H-indole-2,3’–[3H]naphth[2,1-b][1,4]oxazine],1,3-dihydro-1,3,3-trimethyl-6’–(1-piperidinyl) was incorporated onto polypropylene and photochromic polypropylene multifilaments produced through the mass coloration technique. Subsequently the polypropylene (PP) filaments were doped with a different concentration of photochromic pigment, and after producing the filaments different drawing ratios were applied. The photochromic colour build was found to be maximum with the highest concentration of dyes as well as with the lowest drawing ratio. Also the colour differences for L*, a*, b* and ΔE* were analysed with respect to the different concentrations and drawing ratios of the filament. The filaments generally showed good stability of photocoloration during the colour measurement till five cycles. The results for the optical density were reduced by increasing the fineness of the filament. In this experimental work, the impact of the drawing ratio on the optical and mechanical properties of these multifilaments were investigated.

W pracy przedstawiono efekty wprowadzenia spiro [2H-indolo-2,3’ ‚– [3H] nafta [2,1-b][1,4] oksazyna], 1,3-dihydro-1,3,3-trimetylo-6’ – (1- piperydynylu) do polipropylenu i fotochromowych polipropylenowych multifilamentów wytwarzanych techniką masowego zabarwienia. Następnie włókna polipropylenowe (PP) domieszkowano różnym stężeniem pigmentu fotochromowego, a po wytworzeniu włókien zastosowano różne współczynniki rozciągania. Stwierdzono, że kolor fotochromowy jest maksymalny przy najwyższym stężeniu barwników, jak również przy najniższym stosunku rozciągania. Analizowano również różnice koloru dla L*, a*, b* i ΔE* w odniesieniu do różnych stężeń i współczynników rozciągania. Włókna na ogół wykazywały dobrą stabilność fotokoloracji podczas pomiaru barwy do pięciu cykli. Wyniki gęstości optycznej zmniejszono przez zwiększenie rozdrobnienia włókna. W pracy zbadano również wpływ współczynnika rozciągania na właściwości optyczne i mechaniczne włókien.