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The effect of drawing on PET filament sewing thread performance properties
Rudolf, Andreja, 1969- ; Geršak, Jelka
A drawn PET filament sewing thread for the automotive industry was used for this research. This study concerned itself with the draw ratioćs influence regarding certain physical properties of the ...threads, the tensile properties during sewing and the mechanical properties after sewing in order to estimate the drawn thread's sewing performance. An increase in the draw ratio caused a decrease in the linear density, and thread twist. In addition, the tenacity, elastic modulus and tension at the yield point were increased when drawing, whilst the breaking extension decreased. It was found that tensile fatigue and heat loading during the sewing process cause changes in the threads' mechanical properties, depending on the draw ratio. The tenacity, elastic modulus and tension at the yield point had decreased after the sewing process, whilst the breaking extension decreased for those threads drawn at lower draw ratios, and increased for those drawn at higher draw ratios. The results show that those threads drawn at higher draw ratios displayed in a ppropriate sewing performance, resulting from inadequate elastic and surface characteristics.
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