Zhang Zhiran, chief of the textile department and senior engineer of a product quality supervision and inspection institute, introduced several methods for identifying black heart cotton.
One is tearing: good cotton tears have a certain length and toughness, "black heart cotton" fiber length is short, the strength is poor, it is easy to break.
The second is to look at the color: good cotton has a natural original white, while "black heart cotton" is composed of industrial waste and waste fiber. It does not look so white, the color is also mixed, and even contains yarn ends and rags.
The third is smell: cotton has no odor, and "black heart cotton" is often treated by chemical methods such as bleach bleaching or sulfur whitening, which smells odor. It can also be burned with fire, and a little fiber is ignited. The cotton has no odor when burned, and the industrial fiber has a pungent odor.
The fourth is the hand touch: the normal cotton feels softer, has a certain elasticity, feels good, and the "black heart cotton" feels rough.
The fifth is the hand-clap: "Black Heart Cotton" products have high impurity content, and there are more short velvets. When you purchase, you can use a few beats to see if there is a lot of dust.
In addition, when consumers purchase, they can also see whether the product has a logo, and indicate the complete factory name, site, product name, grade, implementation standards, ingredient content, and certificate of conformity. In addition, consumers are advised to request an invoice as a basis for claiming when purchasing cotton wool products.
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