In this study, electromagnetic shielding effectiveness of some weft-knitted structures is investigated. For this purpose, weft-knitted structures are produced using copper wire/cotton incorporated yarns. Conductive yarns are produced by yarn-folding machine. Four knitted constructions (plain knitting, weft in-laid plain knitting, 1X1 rib, and weft in-laid 1X1 rib) are formed into knitted structures with conductive yarns by using 7G flat knitting machine.Electromagnetic shielding values of test samples are determined by a coaxial test fixture relating to ASTM D4935 test standards. Measurements are made in the frequency range of 27 MHz-3 GHz. The effect of conductive content, stitch density and fabric construction parameters are investigated considering the electromagnetic shielding performance of weft-knitted structures. Test results show that weft-knitted structures investigated in this study have 10-40 dB shielding effectiveness under the frequency of 500 MHz.

There is an increasing need to develop new materials for shielding against electromagnetic pollution that result of the change in our life styles. In this study, a high performance textile based composite material that provides effective electromagnetic protection is presented to meet this demand. The over all study was planned in two parts. This paper is the first part of the study and it covers the stages of designing, manufacturing and testing for electromagnetic shielding applications of a composite material. The second part that is planned to be presented in another paper will cover some tests like tensile strength, elongation, durability, flammibility etc. The base textile material is a weft knitted fabric manufactured by using a hybrid yarn consists of polyamid and kevlar 49 yarn plied with a stainless steel wire on a winding machine. Various weft knitted structures were processed by a hot press to obtain 1.5-3.0 mm thin composite layer forms. The Electromagnetic shielding effectiveness (EMSE) measurement in 30-3000 MHz frequency band showed that a shielding performance of 20-60 dB could be achieved depending on the thickness and structure of the composites.

In this study, it was aimed to investigate the effects of fabric lamination angle and fabric ply number on electromagnetic shielding effectiveness (EMSE) of weft knitted fabric-reinforced polypropylene composites. Knitted fabric-reinforced composites are composed of aramid yarn, polypropylene yarn, and copper wire. Polypropylene is the matrix phase and the aramid yarn and copper wires are the reinforcement phase of the composite materials. It was achieved to form 1.5 to 3 mm thickness composites. The composites have nearly 20–50 dB electromagnetic shielding values. To form the knitted fabrics, 7G semiautomatic flat knitting machine was used. The composites were formed by a laboratory-type hot press. EMSE of composites were tested by using ASTM D 4935 coaxial test fixture in 27–3000 MHz frequency band. Lamination angle and ply number parameters were examined related to EMSE of structures. For this study, three different structures were knitted and named as plain knit, 1×1 rib knit, and half cardigan knit. To determine the effect of lamination angle of composites on electromagnetic shielding performance, the composites were produced in two different lamination angles as 0°/90°/0°/90° and 0°/45°/0°/45°. To determine the effect of fabric ply number of composites on electromagnetic shielding performance, the composites were produced in two and four plies. It was observed that the fabric ply number and lamination angle does not affect the EMSE of composite materials very much. It was determined that weft knitted reinforced composite structures have appropriate and high EMSE values for electromagnetic applications. This knitted fabric-reinforced polypropylene composites are flexible and suitable for other industrial applications as civil engineering, aerospace, etc.

Many articles in the literature discuss about the harmful effects of electromagnetic waves emitted by electrical and electronic devices on human health. The composite panels, which are the subject of this study, are designed with the inspiration of the absence of a protective wall covering material from the effects of electromagnetic waves in the market. This study aims to develop a material with electromagnetic insulation as well as heat and sound insulation for especially civil engineering and space engineering applications. In the study, panels are produced by adding carbon fibre and carbon particles into the polyurethane matrix. Heat transmission coefficient tests, sound absorption measurement tests and electromagnetic protection efficiency tests have been made for panels. As a result of the tests, electromagnetic protection values ranging from 22 to 83 dB were obtained from panels and heat transfer coefficient values were found to be less than the standard values of 0.06 W/mK and sound insulation values were found to be having the lowest 0.22 and the highest 0.90 Hz sound absorption coefficient. In addition to the above findings, the composite panels were elastic, lightweight and smooth. Finally, it is determined that the composite panels developed in this study satisfy the conditions required for heat, sound and electromagnetic insulation for engineering applications.

Interest in medicinal and aromatic plants is increasing day by day with the increasing demands of people for natural materials. Because these plants are both environmentally friendly and antiallergenic, they are widely used in many fields, one of which is the medical textile industry. This publication is the first part of a study designed in two parts. The first part includes working with tea tree and rosemary, and the second part, with clove and cinnamon oils. In this paper, based on the antibacterial effects of tea tree and rosemary plants, which are widely grown in Turkey, the application of the oils of these plants to non-woven medical textile material and the antibacterial effectiveness of the post-application material are discussed. The impregnation–curing–drying method, which is a simple and economical one, was chosen for the application process. In this study, Staphylococcus aureus and Escherichia coli bacteria were preferred. Antibacterial activity tests of the applied textile material were carried out according to the AATCC 147 method. As a result of the study, it has been ensured that the application process on the bandages was carried out successfully and the bandages applied with the oils of tea tree and rosemary show antibacterial activity.