Discussion
Package dyeing circulates the liquor
Answer: A
Correct answer: through the centre and out through the yarn
The liquor is pumped up the perforated centre tube and forced radially outward through the wound yarn, so every layer is contacted rather than only the surface. That is what makes it possible to dye a package weighing over a kilogram evenly, and it is why the winding density must be uniform - a hard spot resists flow and dyes lighter.
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