Evaluating the bending rigidity of flat textiles with the use of an Instron tensile tester

The purpose of this work is to verify the possibility of using an Instron tensile tester for evaluating those mechanical properties of flat textile fabrics which are responsible for their handle properties. A method of evaluating the bending rigidity of woven fabrics was developed. The method consists in axially compressing samples fixed at both ends and placed in a vertical position, which leads to their buckling. The bending rigidity was determined on the basis of the critical maximum force occurring at buckling, and the curvature of the buckled sample which appears as result of the action of this force. The results obtained by this method were compared with those obtained with the use of the FAST system. The good compatibility of both these methods was proved by the correlation coefficients

Novel dressing materials accelerating wound healing made from dibutyrylchitin

Dibutyrylchitin (DBC), a soluble chitin derivative, is a polymer with confirmed biological properties. DBC was obtained in the reaction of shrimp chitin with butyric anhydride, carried out under heterogeneous condition, in which perchloric acid was used as a catalyst of reaction. Production of DBC batches was carried out on a half - technical scale line. If DBC parties were examined by infrared spectrometry, size exclusion chromatography and viscometry. DBC with molar mass of 132 x 10(3) daltons was used for the manufacturing of DBC fibres and DBC non-woven materials. DBC non-woven fabrics after gamma-sterilisation were applied to a group of nine patients with different indications. DBC dressing materials were used exluding the use of other medical products. Satisfactory results of wound healing were achieved in most cases, especially in cases of burn wounds and postoperative/posttraumatic wounds and various other conditions causing skin/epidermis loss

Graphene printing for textronic devices

Grafen se dokazao kao izvrstan nanomaterijal za suvremene elektroničke namjene kao što su biosenzori, tranzistori ili grijači. Nastojanja su da se ovaj novi nanomaterijal upotrebljava za razvoj jedinstvenih tekstroničkih uređaja. Trenutno stanje znanosti o materijalima pokazuje mogućnosti dizajna pametnih tekstila s grafenom. Autori iznose rezultate primjene 2D ugljikove strukture u tekstroničkim uređajima. Primjena novorazvijenih tinti i pasta daju zanimljiva svojstva tekstilu kao što su električna vodljivost i osjetljivost na hlapljive organske spojeve.Graphene has been proved to be an excellent nanomaterial for modern electronic applications such as biosensors, transistors or heaters. The natural point of view is to use this new nanomaterial for the development of unique textronic devices. The current state of the art of the materials science shows design possibilities of the smart textiles with graphene. The authors show the results of implementation of 2D carbon structure into the textronic devices. The development inks and pastes give interesting properties of textile such as electro conductivity and sensitive to the volatile organic compounds

Globální transport tepla a hmoty v systému: pokožka novorozence – textilní kompozita – okolí

Globální model transportu tepla a hmoty je definován tepelnou rovnováhou při změně hmoty během odpařování potu z těla. Teplo je vytvářeno metabolickou produkcí tepla a ztrácí se vlivem různých jevů. Podmínky pro zajištění nezbytných parametrů těla novorozence jsou řešeny globálně pro různé parametry dětské čepičky a vrchního oblečení. Studie se zabývá různými možnostmi, jak zabránit hypertermii a hypotermii

Globaler wärme- und Massetransport im System: die haut Neugeborener – Textilkomponenten – Umgebung

Globální model transportu tepla a hmoty je definován tepelnou rovnováhou při změně hmoty během odpařování potu z těla. Teplo je vytvářeno metabolickou produkcí tepla a ztrácí se vlivem různých jevů. Podmínky pro zajištění nezbytných parametrů těla novorozence jsou řešeny globálně pro různé parametry dětské čepičky a vrchního oblečení. Studie se zabývá různými možnostmi, jak zabránit hypertermii a hypotermii.Globalny model transportu ciepła i masy zdefiniowany jest jako równowaga cieplna przy zmianie masy w trakcie odparowywania potu z ciała. Ciepło produkowane jest w wyniku metabolicznej produkcji ciepła a do jego utraty dochodzi pod wpływem różnych zjawisk. Warunki mające na celu zapewnienie niezbędnych parametrów ciała noworodka są rozpatrywane w sposób globalny dla różnych parametrów dziecięcej czapeczki i ubrania wierzchniego. Opracowanie poświęcone jest różnym możliwościom zapobiegającym hipertermii i hipotermii.Global model of heat and mass transport is defined by heat balance with term introducing mass exchange during sweat evaporation. Heat is supplied by metabolic heat production and lost by means of different phenomena. Necessary parameters of neonate body help to solve global correlation for different parameters of bonnet and external clothing. Different cases are discussed to prevent hyperthermia and hypothermia.Das globale Modell des Transportes von Wärme und Masse wird durch das Wärmegleichgewicht beim Stoffwechsel während der Verdunstung des Schweißes aus dem Körper definiert. Wärme wird durch die metabolische Produktion von Wärme gebildet und verliert sich unter dem Einfluss verschiedener Vorgänge. Die Bedingungen für die Sicherstellung der unabdingbaren Parameter der Körper von Neugeborenen werden global für verschiedene Parameter von Kindermützen und Oberbekleidung geklärt. Diese Studie befasst sich mit verschiedenen Möglichkeiten der Vorbeugung von Hyperthermie und Hypothermie

Green Sound-Absorbing Composite Materials of Various Structure and Profiling

This article presents thermoplastic sound-absorbing composites manufactured on the basis of renewable raw materials. Both the reinforcing material and the matrix material were biodegradable and used in the form of fibers. In order to mix flax fibers with polylactide fibers, the fleece was fabricated with a mechanical system and then needle-punched. The sound absorption of composites obtained from a multilayer structure of nonwovens pressed at different conditions was investigated. The sound absorption coefficient in the frequency ranging from 500 Hz to 6400 Hz was determined using a Kundt tube. The tests were performed for flat composites with various structures, profiled composites, and composite/pre-pressed nonwoven systems. Profiling the composite plate by convexity/concavity has a positive effect on its sound absorption. It is also important to arrange the plate with the appropriate structure for the incident sound wave. For the composite layer with an added pre-pressed nonwoven layer, a greater increase in sound absorption occurs for the system when a rigid composite layer is located on the side of the incident sound wave. The addition of successive nonwoven layers not only increases the absorption but also extends the maximum absorption range from the highest frequencies towards the lower frequencies