54
Y. Qin et al.
Fig. 15 a Force at break and
b elongation at break versus
test speed of vPET-1 fibres
(270 °C, 1.0 bar) with the
gauge length of 10 mm
Fig. 16 Data points of force
at break versus elongation at
break of vPET-1 fibres
(270 °C, 1.0 bar) at different
test speeds with the gauge
length of 10 mm
pressure in the aspirator. It can be seen that the tenacity of all the investigated PET
fibres increases as the applied take-up pressure increases, which is valid for both
processing temperatures.
For the PET fibres produced at a lower take-up pressure (below 2.0 bar), the
tenacity presents a gradual increase as the applied take-up pressure increases, and
the fibres produced from virgin PET grades show no significant difference comparing
with that from the recycled PET. For the PET fibres produced at a higher take-up
Y. Qin et al.
Fig. 15 a Force at break and
b elongation at break versus
test speed of vPET-1 fibres
(270 °C, 1.0 bar) with the
gauge length of 10 mm
Fig. 16 Data points of force
at break versus elongation at
break of vPET-1 fibres
(270 °C, 1.0 bar) at different
test speeds with the gauge
length of 10 mm
pressure in the aspirator. It can be seen that the tenacity of all the investigated PET
fibres increases as the applied take-up pressure increases, which is valid for both
processing temperatures.
For the PET fibres produced at a lower take-up pressure (below 2.0 bar), the
tenacity presents a gradual increase as the applied take-up pressure increases, and
the fibres produced from virgin PET grades show no significant difference comparing
with that from the recycled PET. For the PET fibres produced at a higher take-up