Performance indicators of aramid sewing thread

Sewing thread plays a very powerful role in the textile industry, and there are many different types of silk thread products in the current textile industry, including aramid sewing thread. As a type of sewing thread, I wonder how many related understandings do you have about aramid sewing thread? When using aramid sewing thread, it is necessary for everyone to understand the relevant performance indicators of aramid sewing thread, which is also the content that the editor will introduce to you next. I hope everyone can read the following article carefully and gain something from it.
1. Single thread breaking strength: (1) Testing instrument: a strength testing machine, equipped with a specialized fixture for aramid sewing thread; (2) Test method: Take 3 test samples with a length of 500mm, fix them at both ends of the dedicated fixture, start the machine, stretch at a speed of 500mm, record the maximum force at fracture, and test three times using the same method. Take the average value to obtain the test result.
2. Twist: (1) Testing instrument: Twist meter; (2) Test method: Set the pointers on the counting panel and fine-tuning panel of the twist tester to "0", and clamp the testing aramid sewing thread firmly onto the fixture on the left and right sides; Thread a needle through the strand thread, shake the twist meter clockwise by hand and pull it from left to right until there is no twist on the thread. Read the data on the counting panel and fine adjustment panel of the twist meter and calculate the twist value of the aramid sewing thread.
3. Color fastness: (1) Testing instrument: Friction decolorization testing machine; (2) Test method: Wrap aramid sewing thread parallel on the bottom plate, start the machine, press the moving end wrapped in aramid sewing thread onto the sample and walk back and forth 20 times, then remove and confirm the color fastness level.
4. Elongation rate: (1) Testing instrument: strength testing machine; (2) Test method: While testing the single thread strength of aramid sewing thread, the results of elongation can generally be read simultaneously on the computer.
5. Light resistance: (1) Testing instrument: dedicated testing light box; (2) Test method: According to different standards for humidity, light source, intensity, and time, after irradiating the test object inside the lightbox, visually compare the fading situation with the original sample.