series of technical developments in the recent years has resulted into
package dyeing being developed into a highly sophisticated as well as an
economic process. Latest design Package Dyeing machines are amenable to
accurate control and automation. These features would likely to lead to
increases in the application of package dyeing. The term package dyeing
usually denotes for dyeing of yarn that has been wound on perforated
cores. This helps in forcing the dye liquor through the package. With
the start of dyeing cycle, the dye liquor goes on circulating throughout
the vessel and tank. This happens till all the dye is used up or fully
exhausted. The dye flows through to the yarn package with the help of
the deliberate perforations in the tube package. Once full exhaustion is
brought about, the carrier of coloured yarn is consequently removed from
the vessel. A large centrifuge removes excess water from the packages.
Finally the yarn is dried using an infra red drying oven. The image
shows the process working of a Package dyeing machine.
Package dyeing methodologies have been subjected to
intensive research and development. As a result package dyeing machine
has evolved into a very sophisticated apparatus. It offers a number of
- Considerable reduction in yarn handling.
- Compatible to automatic control, in the process leading to
- Open to large batches.
- High temperature dyeing a possibility.
- Low liquor ratios, giving savings in water, effluent and energy.
- Uniform and High rates of liquor circulation, that leads to level
application of dyes.
- Machinery, totally enclosed resulting in good working conditions
at the dyehouse.
A few types of package dyeing machines are described
Vertical Spindle Machines
Vertical spindle machines are common today. The packages are press
packed onto the vertical carrier spindles so as to increase the payload.
It also aids in the dye liquor circulation and minimising the liquor to
fiber ratio. Machineries of this sort can operate at liquor ratios as
low as 6:1. The following Figure shows a typical package dyeing machine
where the yarn packages are held on multiple spindles. An overhead crane
system makes yarn carrier to be entered and removed from the machine
Horizontal Spindle Machines
This is an alternative configuration for the vertical spindle machine.
Here, the dyeing kier is mounted horizontally and the yarn carrier is
introduced from a trolley. This arrangement effectively replaces the
need for crane. Horizontal Spindle Machines has simplified the design of
the dyehouse building.
Tube Type Machines
Tube type machines have a series of vertical or horizontal tubes into
which package carriers get inserted. The tubes that form the individual
dyeing vessels are linked by common circulation pumps and pipe work.
These type of machines offers the advantage of flexibility than the
above mentioned types. This is because individual tubes can easily be
blanked off to change the overall load limit of the machine.