|
Abstract:
|
The production of manmade fibers has increased continuously since 1981.
Polyester is one synthetic fiber that is produced in large quantities, with polyester
filament holding 39 % of the manufactured fiber market. There are two primary
methods for the texturing of filament yarn that are used today, false-twist and air jet
texturing, with false-twist texturing comprising nearly 60% of the textured yarn market.
Although false-twist textured yarn is used in both woven and knitted goods, neither is
free from problems. The most prevalent problem is that of barre in dyed knitted fabrics
made from textured filament yarns.
The purpose of this research was to determine which texturing parameters have
the most effect on dye uptake, and to develop a suitable dyeing method to reduce the
effect of barre. It was determined that heat-setting fabrics at 180 °Celsius/356
°Fahrenheit produced overall smaller average differences in dye depth from a standard
than fabrics heat-set at 200 °Celsius/392 °Fahrenheit. Also, it was concluded that
scouring temperature does not have an effect on reducing dye differences. Of the three
dyeing temperatures evaluated, the highest dyeing temperature of 140 °C/286 OF, was
most successful in reducing dye differences. Furthermore, it was determined that the
leveling agents evaluated reduced the shade depth differences overall. It was ascertained
that dye uptake is primarily affected by heater temperature and draw ratio at texturing.
As a result, it is imperative that texturing operations closely monitor heater temperature
and draw ratio during the texturing process.
|