Page 231 - Basic Principles of Textile Coloration

220 DYEING MACHINERY

Figure 12.2 Illustration of a typical package dyeing machine (courtesy of Macart
Textiles Ltd)

craned into and out of the machine. Thus, one frame is in preparation while one is
in the machine.

The dye liquor is pumped into the base of the frame and up through the
perforated spindles. Solid spacer plates seal the ends of each package on a spindle
and force the circulating liquor to flow out horizontally through the package.
Because of their regular cylindrical shape, however, cheeses on compressible
formers can often be mounted on the spindles without spacer plates, and
compressed together. At the top of the spindles, a screw-on plate presses the
cheeses down and gives a good seal between them. Cones cannot be compressed
lengthways to the same extent as cheeses and usually require solid spacer plates
between them. Even then, the liquor flow through a cone is not usually as uniform
as through a more regularly shaped cheese. The dye liquor flows up the perforated
spindle and flows outward through the packages of wound yarn. It then flows back
down over the outside of the frame and back to the pump. Heating is usually with
super-heated steam in coils situated just below the frame carrying the spindles.
The same coils, or a different set, can be used for cooling.