The level dyeing performance of bobbin yarn depends to a great extent on the flow selection of the main circulation pump. For this parameter selection, the early bobbin dyeing machine equipment will rely on experience to meet the requirements of low flow. In summary, it will be based on the principle that there will be no color difference between the inside and outside of the bobbin dyeing machine equipment yarn.

Because of the diversity of yarn varieties, we should also note that different yarns require different flow rates, in view of this, for fixed flow, there are some drawbacks. To a large extent, it can satisfy the flow of polyester-cotton blended yarn, that is, it will make pure cotton yarn appear internal and external color difference; it can satisfy the flow of pure cotton yarn, it may also make polyester-cotton blended yarn deformation。

When the cone yarn dyeing machine using, we should also pay attention to the selection of flow rate, which is closely related to whether the yarn is used for knitting or shuttle weaving. Practical experience shows that for the same kind of yarn dyeing, the selected flow rate for knitting is larger than that for shuttle weaving. If the flow rate is not selected properly, it will not only have a great impact on the dyeing quality, but also cause a certain amount of energy waste when it is used in practice. As far as the equipment of cylinder dyeing machine is concerned, the flow rate should also be controlled.

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