Quality Control Questions
  • Quality control questions



    Q.1.What does curly control mean in filament yarns?


    C.1. It is to determine the number and size of the curl waves by crimp measurement.


    S.2.What are the factors affecting yarn strength? ?


    C.2. 1- Fiber length 2- Fiber fineness 3- Distribution of molecules in the yarn structure 4- Raw materials that make up the yarns 5- Irregularity rate 6- Twisting

    S.3.İ%Ya in yarnğ Quantityı What does designation mean?


    C.3. It is determined whether the oil rate in POY yarns is at the desired rate.


    S.4.What does yarn count spinning wheel (meter length) mean?


    C.4. It is a tool called a spinning wheel, which is used to measure the length of the threads to cut certain lengths.


    S.5.What does precision scale mean?


    C.5. It is a device that enables the weight of the yarns whose length values ​​have been determined to be found by weighing them on a scale with 1 mg sensitivity.


    Q.6.What does yarn strength mean?


    C.6.It is the resistance of the yarn to an applied load.


    Q.7. What are the benefits of having a high strength value in the yarn?


    C.7. 1-Reduces time loss 2-Increases quality 3-Increases aesthetics 4-Reduces yarn breaks 5-Reduces machine downtime 6-Reduces cost.


    S.8. What are the parameters used when determining the strength of the yarn?




    1- Tensile strength

    2-Elongation percentage

    3-Breaking length

    4-Breaking load

    5-Breaking voltage

    6- Determination of strength in yarn.


    S.9. What is the breaking strength (tension at break) of the yarn?


    C.9. It is the ability of the yarn to withstand tension or its breaking strength.


    S.10. Explain the breaking strength (tension at break) of the yarn?


    C.10. Tensile strength of yarn; It is the ability of the yarn to withstand tension or its breaking strength. This can also be called the breaking tension of the yarn. It is the maximum resistance that occurs in a tensile strength test advanced to rupture. Tensile strength is measured in grams per denier or grams per tex and is expressed as force per unit yarn count. 1- Denier strength: The grams or weight (in g/den) required to break one denier yarn or fiber. 2-Tex strength: grams or weight (g/tex) required to break one tex yarn or fiber.


    Q.11.What is the percentage of yarn elongation?


    C.11. It is a measure of the degree of elongation of a yarn under tension.


    Q.12. What is the percentage of elongation in the yarn?




    .Elongation rate is expressed in three ways:


    1-In length


    2-As a percentage of the initial length


    3-As part of the first length.


    Q.13. What is the elongation capability of the yarn?


    C.13. When the force is removed from a product that has been stretched to its critical point of extension, it quickly returns to its origin. After this point, it is not possible to return to the starting point, as stretching will be provided by breaking the macromolecular chains. Stretching or lengthening a thread by the effect of stretching to the breaking point extensibility or extensibility specifies. The change in length or deformation of the yarn after the application of the tensile force is measured as a percentage of its original length.


    Q.14. What is the breaking length of the yarn?


    C.14. It is the length at which a yarn breaks with its own weight. In filament yarns, whether the molecular structure is smooth or not is one of the most important factors affecting the breaking length. If the linear areas (where the molecules are located properly) are high, the breaking length is high; If the amorphous areas (where the molecules are dispersed) are high, the breaking length is low. Break length is a measure that makes it possible to compare different control materials with different numbering systems with each other. Abbreviation of breaking length, breaking mileage race'Dr.


    Q.15. What is the breaking load and tension of the yarn?


    C.15. It is the load required to break the yarn that develops the breaking tension.


    Q.16. What conditions must be met for measuring devices used in strength tests?




    1- Applying a constant load increase to the sample or providing a constant amount of elongation to the sample at the same time,


    2-It automatically measures the amount of elongation in the yarn under the applied force,


    3- Calculating and showing the load required to break the sample,


    4-Measuring and showing the elongation up to the maximum load,


    5-Holding the thread securely, thus preventing thread breakage as a result of clamping in the jaws,


    6- It should be in a way to load the maximum load on the sample in 20 ± 3 seconds.


    Q.17. What should be done to determine the filament yarn, strength and breaking elongation and breaking loads at the same time according to the principle of equal test speed?




    1-All samples are conditioned before the control.


    2- According to the yarn type, the previously adjusted program is selected,


    In 3-POY yarns; distance between clamps 200 mm ±1 mm; test speed 1500 mm/min; pre-tension 0.05 g/tex


    4-Textured, twisted, FDY etc. in threads; distance between clamps 200mm±1mm; test speed yarn break time 20 sec. is set to be.


    5-Before starting the control, 1000 meters of thread is untied from the thread surface.


    6-Strength measuring device is run for each sample.


    7-Strength measuring device gives the average value by making 5 shots for each sample.



    Posted by %AM, 24% 938%2022 00%:%Jan in Lesson Questions

Quality Control Questions