What is RKM in Yarn Testing?
RKM (Relative Knitting Machine Gauge) is a measure used to determine the fineness or coarseness of a yarn. It is expressed as the number of knitting machine needles per inch (NPI), and is used to indicate the size of the yarn in relation to the knitting machine on which it will be used.
Why is RKM Important?
- RKM helps to ensure that the yarn is the correct size for the knitting machine, which affects the quality and appearance of the finished fabric.
- It also helps to determine the knitting machine settings, such as needle spacing and yarn tension, which are necessary to produce the desired fabric.
How is RKM Measured?
RKM is measured using a specialized instrument called a **yarn count tester**. The yarn is passed through a series of needles, and the number of needles per inch (NPI) is counted. The NPI is then converted to RKM using a conversion chart or formula.
Factors Affecting RKM
- Fiber type: Different fiber types have different yarn properties, which can affect the RKM.
- Yarn construction: The way the yarn is spun or twisted can also affect the RKM.
- Yarn finish: The type of finish applied to the yarn, such as dyeing or bleaching, can also affect the RKM.
Conclusion
RKM is an important measure in yarn testing as it helps to determine the fineness or coarseness of a yarn. This information is essential for selecting the correct knitting machine and settings to produce the desired fabric.
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