Yarn fineness indicators are the same as fibers, and can be divided into two categories, direct and indirect. Direct indicators are diameter, cross-sectional area, perimeter, etc. For fibers and yarns, direct index measurement is more troublesome. Therefore, in addition to the diameter of the wool fibers to indicate the thickness of the fibers, other fibers and yarns are generally not represented by direct indicators such as diameter. When the textile process needs to use direct indicators, it is converted using indirect indicators. The indirect indicator is to use the relationship between the length and weight of the yarn to express the linear density, which is divided into fixed length system and fixed weight system. Fixed length refers to the standard weight of fibers and yarns of a certain length; fixed weight is the length of fibers and yarns of a given weight.
The fineness of the yarn indirectly indicates the cable density (Tt), denier (Ndem), metric count (Nm) and imperial count (Ne). The concepts and calculations of linear density, denier, and metric count are the same as those for fibers. Please refer to Chapter 1, which is only an example.
Example 1 It is known that a pure cotton yarn has a weight of 50 g and a length of 2500 m measured at a fixed moisture regain. What is the linear density Tt and the denier Ndem?
Solution: Substituting known quantities into equations (1-9) and (1-10), respectively:
Yarn weighing method is usually used for testing of indirect indicators of yarn fineness in production. Weaving a certain length of yarn (100M for general cotton yarn, 50m for combed yarn, and 20m for carding yarn) with a yarn length measuring instrument, and weigh the total weight of some hank yarn after drying with the oven method. , you can get a variety of fineness indicators according to the definition of each indirect indicator.
(I) Fineness expression and calculation of strands
The fineness of the strand is expressed by the combination of single yarn fineness and single yarn count n.
When the single yarns constituting the strands are expressed in line density, if the individual yarns making up the strands have the same density, the strand fineness is expressed as:
Tt shares = Tt × n (2-2)
If the density of single yarns making up the strands is different, it is expressed as:
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