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i'm stumped denimheads


mr fluffernutter

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In the field of yarn dyeing, for instance, hank dyeing has been performed by forming yarns into hanks, hanging the hank yarns on a rod of a hank dyeing machine, and flowing a dye liquor through the hank yarns from the inside toward the outside thereof while revolving the hank yarns, whereby the dye liquor comes in even contact with the yarns and an even dyeing is attained. However, this method requires time-consuming laborious work in hanking, hank reeling and yarn connecting. Moreover, the dyeing process cannot be automatized, necessitating laborious work and is performed under poor working conditions. Because of the reasons above, cheese dyeing is currently superseding the hank dyeing.

When cheese dyeing is carried out, it has been the practice that as shown in the accompanying FIGS. 2a and 2b, yarns to be dyed are wound upon bobbins for dyeing to make parallel cheeses or cone cheeses (11) and they are piled on a spindle (12) one upon another while interposing a spacer (13) between each of the bobbins. Here, it is required to wind up the yarns softly and evenly in order that the resulting cheeses may be brought into even contact with a dye liquor.

However, shoulder parts of the cheeses where yarns are turned back or portions of the cheeses on which a tension due to winding up of the yarns concentrates have caused unevenness in winding density, which has resulted in uneven dyeing. As a consequence, in order to eliminate the drawbacks, efforts have been made to attain evenness in winding density as far as possible by, for example, levelling off the shoulder parts or performing soft winding by means of a to-and-fro motion or feed rollers.

Nevertheless it has not been possible to obviate unevenness in winding density, and consequently, it has been extremely difficult to pursue even dyeing characteristics, since a dye liquor flows smoothly through soft portions of the cheeses, but is difficult to flow through high-density portions of the cheeses.

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