The aim of this study was to find out the possibility to predict the compression properties of orthopaedic knits by inlayyarn properties. For this purpose, six groups of elastic double covered threads with different raw material were investigated. It was established that in area of low elongation, the covering threads practically don't have significant influence on tensile force values. Also results demonstrate that by increasing the number of tested threads, the elongation value has a higher impact on tensile force. The influence of linear density of elastic PU core on tensile force increases by increasing elongation value of threads. When influence of inlay-yarn linear density and number of threads on tensile force is determined it is possible to predict influence of inlay-yarn properties on compression properties of knitted orthopaedic supports.
One of the areas of medical textile is the spacer knitted orthopaedic products. The concept of compression therapy of orthopaedic supports lies on a simple and efficient mechanical principle – it consists of applying elastic garment around the limb. Spacer orthopaedic supports are knitted on flat knitting machines equipped with especial elastomeric thread feeder. Compression made by the support depends on the support area, shape and characteristics of knitting. Because of orthopaedic supports are intended for durable wearing and need to vouchsafe compression of fixed value, it is very important to known how processes acting during exploitation influence alteration of compression values.
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