Popular Science | Can you sort out these three types of elastic fibers: spandex, PTT and T-400?

<section style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; min-height: 1em; font-size: 16px; letter-spacing: 0.544px; text-indent: 2em; font-family: -apple-system-font, BlinkMacSystemFont, " helvetica ="" neue="" pingfang="" sc="" hiragino="" sans="" gb="" microsoft="" yahei="" ui="" arial="" sans-serif=""

(5) Good dimensional stability and easy to handle.

T-400 can be combined with natural fibers and The blended fabric is blended with man-made fibers to increase strength and softness. The blended fabric has a clean and smooth appearance, and the clothing has clear outlines. The clothing can still maintain a good shape after repeated washing. The fabric has good color fastness and is not easy to fade. It will still look like new clothes after being worn for a long time. At present, T-400 is widely used in pants, jeans, sportswear, high-end women’s clothing and other fields due to its excellent wearing performance.

The combustion method uses various fibers Different chemical compositions produce differences in combustion characteristics to identify fiber types. The method is to take��A small bundle of fiber samples is ignited and burned. Carefully observe the fiber burning characteristics and the shape, color, softness and hardness of the residue, and smell the odor it produces.

From the combustion characteristics of the above three elastic fibers, we can easily distinguish PU from the other two fibers based on the conditions of the three fibers after leaving the flame. In addition, the odors and residue characteristics produced by these three fibers when burned are obviously different, so they can be identified.

Microscopy is to use a microscope to observe the longitudinal and transverse cross-sectional shapes of fibers, and identify fibers based on their morphological characteristics by comparing them with standard microscope photos and standard data

The chlorine- and nitrogen-containing color reaction method is based on the fact that fibers containing chlorine and nitrogen elements will show specific color reactions using flame and acid-base methods to identify whether the fiber contains…Two elements: chlorine and nitrogen. During the test, take a clean copper wire and use fine sandpaper to remove the oxide layer on the surface. Burn the copper wire in a flame and immediately contact it with the sample. Then move the copper wire to the flame. If the flame is green, it means that the fiber Contains chlorine; put a small amount of chopped fiber into a test tube, cover it with an appropriate amount of sodium carbonate, heat the test tube on an alcohol lamp, and place a piece of red litmus paper at the mouth of the test tube. If the litmus paper turns blue, it means that the fiber contains nitrogen. . As can be seen from Table 3, we can easily identify PU fiber through the chlorine-nitrogen colorimetric method, but we cannot distinguish between PTT and T-400 fibers.