Everyone must have seen or met in the day-to-day life. The situation in the picture is certainly both angry and embarrassing.
This is actually happening because of the shedding of dyes caused by the dyed fabrics in everyday wear. Of course, to evaluate this fading phenomenon, it also has a professional name we call it "fastness to rubbing."
Our country has strict requirements on this fading phenomenon in the mandatory standard GB18401 "National Basic Safety Technical Specifications for Textile Products".
Not only that, like an ID card, it also has its own "ID card." The picture below is its "ID card." Don't underestimate this "ID card." All textile products sold in China are tested and evaluated. Strictly follow this standard method.
It is certainly very curious for the little partners to understand the above knowledge. What exactly does the standard do? Then learn with me! Not much to say, the following picture is the first artifact used in this standard "friction color fastness instrument."
The color fastness to rubbing in the laboratory is mainly tested with it. The color fastness to rubbing is classified into dry rub resistance and wet rub resistance. Its test method is:
1 Dry friction
Place a piece of (50×50) mm rubbing cloth (standard white cotton cloth) in a standard atmosphere (temperature 20°C±2°C, humidity 65%±4%), adjust the humidity (4 hours or more), place it on the friction head In the above, the direction of the rubbing cloth is consistent with the allowable direction of the rubbing head, the running speed is one reciprocating rubbing cycle per second, and the total friction is 10 cycles. The rubbing stroke on the sample is (104±3) mm, and the applied direction is The downforce was (9 ± 0.2) N. After the entire 10 cycles were completed, the rubbing cloth was removed, humidity was adjusted (over 4 hours), and any excess fibers on the rubbing cloth that could affect the rating were removed. Pictured:
2 Wet friction
The weighed piece of rubbing cloth was completely immersed in distilled water, taken out, and the rubbing cloth was weighed again to ensure that the moisture content of the rubbing cloth reached 95%-100%, and then the operating method was rubbed with dry rubbing.
Ratings
Finally, we need to take the rubbed wet dampened cloth into the rating chamber in the standard light box, and use the gray scale card to evaluate the staining of the rubbing cloth. (Note: Each rubbed cloth is evaluated Place three layers of rubbing cloth on the back.
Warm tips
Newly bought clothes will have some floating colors on them, which will cause discoloration. It is best to wear them after they are washed.
Friends, said so much, useful to you? Welcome to continue to pay attention to our "outdoor technology"!
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