Estimation of the EMR shielding effectiveness of knit structures

This paper describes the creation of and tests petformed on knit structures of three types (left-right stitch (I), double-layer (II), and double-layer with additional fillings (III)), which contain ferromagnetic materials and electroconductive materials and are designed for individual protection against occupational hazard. The ferromagnetic material is composed of two bunches of twisted filaments of ferromagnetic stainless steel made by Bekaert, Belgium, and the electroconductive material is a thread made of cotton and copper wire covered by silver made by Swiss Shield (R) yarns, Switzerland. Both the ferromagnetic and electroconductive materials form a hybrid yarn. Shielding effectiveness (SE) tests on knit structures were performed by the Central Institute for Labour Protection - National Research Institute, Poland and by the Institute of Architecture of Textiles, Poland. Analysis of the structures indicates a SE from both the electrical field and magnetical field in some narrow ranges