Why Can Knitted Sweater Pilling?

Recently, a lot of fans complained with Xiaobian about why other people's sweaters are so good quality that their own sweaters wear the ball once and cross the pilling. Is the brand too bad?
Speaking, sweaters can display their skills in at least three quarters throughout the year. Just for its practicality, we also need to learn about the knowledge of sweater maintenance.
Just now when it is time to wear a sweater, people do not want to dress beautifully to go out, but they are said to be slovenly by others. Today, Xiaobian is going to do some spectral analysis. Why on earth does your sweater play ball?

Speaking of this, many people do not understand what is the reason, and some people even think that as long as the pilling is the quality problem. I want to say, this is your prejudice.

In fact, in the process of using all kinds of fiber clothing, because of the attrition effect of various external forces, the surface of clothing will be more or less pilling and pilling.
Look at the wool coat as the top international male model lock in the country. I can see that I want to give him a shave.
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Therefore, this phenomenon is inevitable on natural fibers and chemical fiber fabrics. At present, it is also a technical subject to be solved internationally.