|
Abstract:
|
One goal of yarn package dyeing is to apply dye uniformly throughout the
packages, and the liquor flow profile affects the levelness. Liquor should flow uniformly
through the packages with level dyeing expected. If liquor short cuts out the sides of the
packages, which is leakage, unlevel dyeing is expected. The package dyeing industry
therefore should understand the variables affecting liquor flow.
1
Computational fluid dynamics (CFD) was used in this research to model the flow
of dye liquor during package dyeing and to determine how the liquor flow rate, package
density, and package permeability affect the liquor flow profile. To create an accurate
model, data were taken from dyed yarn packages.
When each yarn package on the spindle was sealed at the ends to prevent leakage,
the proportion of axial liquor flow was zero, a uniform flow profile. When the end caps
were permeable to liquor flow to allow leakage, the percent axial flow increased with
increasing package density.
|