Quality Control in Fancy Yarns
  • Quality Control in Fancy Yarns


    1-Linear Density Test

    Linear density test is performed on fancy yarns as in standard yarns.

    This test is carried out according to the ISO 2060 (2013) standard (ISO 2060).

    The principle of the test carried out in this way is based on weighing the unit length of the yarn in the form of bobbins on a precision scale.

    The formula to be used when it is desired to find the linear density of the yarn in tex according to the measurement made: Yarn count in Tex = 1000 x yarn weight weighed (g) / yarn length (m).

    Apart from this test method, it is also possible to test according to the ISO 7211/5:2010 standard, where the linear density of the yarns removed from the fabric is measured, and in this test method, the measurement is made by taking into account the fold (ISO 7211).

    2-Twist Test

    Twist is imparted to yarn in different ways according to fancy yarn production technology.Twist is an important parameter that not only adds strength to a fancy yarn and fixes the effect to the yarn, but also affects the yarn appearance and handling, and the production speed. It is desirable that the twist be balanced in accordance with the effect material used and the main yarn. However, it is also possible to create a fancy effect by changing the twist in fancy yarns obtained with multiple twist effects. ISO 2061 (2015) Determination of Twist Amount in Yarn” standard is used for the determination of the twist of single-ply and multi-ply fixed-twist yarns (ISO 2061).

    3-Strength Test

    Strength and elongation at break values ​​of fancy yarns are made according to ISO 2062: 2015 Determination of Breaking Strength and Elongation at Break of Single Yarn' standard. However, in fancy yarns with variable densities along its length, such measurements may not be completely accurate, as the thick-thin place difference will be significant at certain points (for example, slub yarn) and a yarn will break at its thinnest point. The breaking strength, breaking elongation and elasticity values ​​of the tested yarns are obtained (ISO 2062).

    4-Thread Profile Test (Lens)

    The measurable profile properties of the produced fancy yarns are as follows;

    Measured parameters for loop yarn are loop size and loop opening.

    For knot yarn, the measured parameters are knot size and basic yarn diameter.

    Structural parameters measured vary depending on the fancy yarn type. All profile parameters are measured with computer aided microscope systems.









    5-Thread Appearance Detection (Subjective)

    Fancy yarns can also be evaluated subjectively apart from the test devices mentioned above. The purpose of this is to see the reflection of changes in yarn production parameters on yarn properties. Below are images of some fancy yarns with different twist and overfeed rates.





    6-Monitoring Effect Durability in Fancy Yarn

    It is the effect material that gives the fancy yarn its original feature. According to the desired properties, the material can form full circular loops on the main yarn by overfeeding the effect material, as in loop yarn.






    As with slub yarn, yarn density can increase at certain points of the yarn as a result of accumulation of effect material.






    As with the muline yarn, the effect material in different colors gives the main yarn a different look.






    The effect material is the element that gives the fantasy effect to the fancy yarn. The durability of this effect is possible with the protection of the effect material of the effect material and the durability of its bond with the main thread. Factors affecting this durability; the type of effect material, the strength of the binding thread, the number of twists given in the production process, the after-treatments of the thread, if it will be used to create a surface (such as knitting, weaving), its resistance to these processes, etc. are the factors that determine the durability of the fantasy effect. Applying tension to the yarn alone or after transferring from bobbin to bobbin at a certain tension, after a post-treatment such as vacuum steaming, etc. The durability of the effect material after processing can be visually tested. In addition, after the fancy yarns are brought into fabric form, the effect durability can be tested. Such a test method enables us to see the properties and performances of fancy yarns more realistically in accordance with the place of use.



    Posted by %PM, 24% 478% 2017 13%:%Jun in Yarn Read 2418 times

Quality Control in Fancy Yarns