TY - JOUR
T1 - Research into the Mechanical Properties of Drawn Filament Sewing Thread
JO - Journal of Fiber Bioengineering and Informatics
VL - 3
SP - 243
EP - 251
PY - 2012
DA - 2012/05
SN - 5
DO - http://doi.org/10.3993/jfbi09201202
UR - https://global-sci.org/intro/article_detail/jfbi/4878.html
KW - PET Filament Sewing Thread
KW - Drawing
KW - Treatment Conditions
KW - Mechanical Properties
AB - This study presents research into drawing conditions' influences on the mechanical properties of
Polyethylene Terephthalate (PET) filament sewing thread. The thread was drawn by varying the
treatment temperature and contact time on the first heated cylinder (T1, n1) and on the second heated
cylinder (T2, n2), as well as by using different draw ratios (λ). The critical treatment conditions were
found using the drawing process (T1_4=130 °C, n1_5=13 turns, λ_5=1.25, T2_4=220 °C, n2_3=9 turns)
and the greatest improvement in the mechanical properties, respectively. Deterioration in the threads'
mechanical properties was observed above the critical treatment conditions. The mechanical properties
of the drawn threads were investigated under critical treatment conditions. It was found that the heat
treatment conditions on the second cylinder, i.e. the treatment temperature and the contact time had the
greatest influences on the improvement of the elastic modulus (D4=7.41 cN/tex, E3=7.40 cN/tex) and
the breaking extension (D4=12.13%, E3=12.12%), when compared with the treatment temperature and
the contact time on the first cylinder and the draw ratio between the heated cylinders. The maximal value
of the breaking tenacity showed threads that were drawn at the critical draw ratio (C5=61.81 cN/tex)
and the contact time of the thread with the second heated cylinder (E3=61.59 cN/tex). Simultaneously,
the treatment conditions on the second cylinder affected the maximum reduction of the thread's linear
density (D4=91.33 tex, E3=91.47 tex) and twist (D4=163 turns/m, E3=180 turns/m). The greatest
improvement in the tension at the yield point achieved threads that were drawn at the critical draw
ratio (C5=9.27 cN/tex) and the heat-treatment temperature on the second cylinder (D4=9.27 cN/tex).