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- ItemSURFACE ROUGHNESS OF POLYAMIDE KNITTED FABRICS(Technical University of Liberec, ) TOMOVSKA, ELENA; HES, LUBOS; Technická univerzita v LiberciFabrics are never ideally smooth. Their texture varies between fine and coarse, quantified through the surface’s vertical deviation. Fabric roughness, or its opposite smoothness, is employed as measure of the surface texture of fabrics. In general, texture depends upon fiber properties, yarn count, yarn twist, and fabric structure and fabric design). This research aims to determine the limitations in visual perception of surface roughness in comparison to objective surface roughness measurements of low weight polyamide fabrics. Subjective evaluation is used for the visual assessment, while instrumental measurement of the properties was conducted using a noncontact laser profilometer. Subjective evaluation was conducted by a panel of forty untrained evaluators on a sample of seven polyamide knitted fabrics with different yarn count and composition. The roughness profile parameters were measured using Talysurf CLI 500 according to ISO 4827. Although the surface roughness measured as arithmetic mean deviation (Ra) and roughness through visual inspection of the fabric are correlated, instrumental measurements of roughness are more precise. Differences in the surface roughness arising from significantly different yarn structures will be observed, while those due to the knitted fabric structure are negligible in visual inspection.
- ItemSTANDARDISING THE SAMPLE PREPARATION FOR ANALYSIS OF FIBRES AND PARTICLES BY STATIC IMAGE ANALYSIS(Technical University of Liberec, ) FISCHER, HOLGER; SIGMUND, INA; HARTWIG, PETRA; DEDERER, ESTHER; MASCHINSKI, ANNETT; Technická univerzita v LiberciStatic image analysis is known as a versatile method, which is in use for characterisation i.e. of fibres, nonwovens, textile recyclates etc. Due to incomplete standardization (esp. in the area of sample preparation) the usage is actually limited. Within the project StaPAFaB two research institutes are engaged to compile a reference manual listing typical classes of materials and optimised methods of sample preparation for each of them. This will be combined with recommendations for reasonable parameters in image acquisition / processing and possible limitations for each type of material. Aim is to enable reproducible and consistent analyses on an inter-laboratory level as well as to reduce the demand of time for the analyses. This article focuses on typical classes of textile materials and adapted methods to enable their quick and reliable sample preparation.
- ItemIDENTIFYING THE MATERIALS IN ARCHAEOLOGICAL TEXTILES(Technical University of Liberec, ) BŘEZINOVÁ, HELENA; PECHOČIAKOVÁ, MIROSLAVA; GRABMÜLLEROVÁ, JANA; Technická univerzita v LiberciGiven their organic origin, textiles rank among the rarest archaeological finds. While the vast majority of these artefacts are preserved as small fragments or mineralised remnants, their detailed textile technology study provides interesting and important information about the use of textile techniques and the quality of processing. The most important information concerns the utilised textile materials, but for degraded textiles, these materials are among the most difficult information to obtain. Image analysis using electron microscopy (SEM) is a significant aide in this pursuit.
- ItemPOLYACRYLONITRILE NONWOVENS FOR THE PRODUCTION OF CARBON MATERIALS SUPPORTING THE REGENERATION OF BONE AND CARTILAGE TISSUES(Technical University of Liberec, ) BOGUŃ, MACIEJ; ŚLEDZIŃSKA, KATARZYNA; GIEŁDOWSKA, MAŁGORZATA; KRÓL, PAULINA; KAMIŃSKA, IRENA; MAGDZIARZ, SYLWIA; Technická univerzita v LiberciThe influence of the change in surface weight on the physical properties of oxidized polyacrylonitrile precursor nonwovens intended for the production of carbon materials used in tissue engineering was studied. Thermal insulation properties of the nonwovens and their behavior during incubation in phosphate buffered saline (PBS) were investigated. Initial carbonization tests showed that from the point of view of carbonization and further application of carbon materials, the most effective was the use of a surface weight of about 120 g/m2. At the same time, for the research conducted on the incubation of nonwovens in PBS, no significant change in the pH of the solution was found.
- ItemINVESTIGATING THE APPLICATION OF TERRA DYE ON COTTON KNITTED FABRICS(Technical University of Liberec, ) SOOCHETA, ANAGHA VAIDYA; BHUNDOO, SANSKRITA SINGH; Technická univerzita v LiberciToday, sustainable textile dyeing technologies are being researched with a purpose of developing ecofriendly dyes that are cost effective and resource efficient. Natural Earth Pigments also known as native earth pigments, earth colours, earth ochres, iron oxide pigments etc. come from naturally occurring minerals, typically iron oxide or manganese oxide. Terra dye is a sustainable and environment friendly dye which has been derived from pigmented earth and without the use of harsh toxic chemicals. It is 100% natural, obtained from the extraction of minerals. The study investigates the application of ‘Terra dye’ on cotton knitted fabrics. 100% Cotton Jersey and 100% Cotton Fleece fabrics were used. The terra dyed fabrics were tested for their properties of colour uptake, bleeding, rubbing fastness, resistance to light and washing fastness. The effect of different fixing agents was investigated. The results of the lab trials and testing, conclude that Terra dye has good prospects of being used in dyeing.