How to identify the composition of knitted fabrics and textile fabrics

The easy way to identify the composition of clothing fabrics is the combustion method. The method is to draw a strand of cloth yarn containing warp yarn and weft yarn at the seam of the garment, ignite it with fire, observe the state of the burning flame, smell the smell of the cloth yarn after burning, and look at the residue after burning to judge Whether it is consistent with the fabric composition marked on the clothing durability label to identify the authenticity of the fabric composition.

1. Cotton fiber and hemp fiber Both cotton fiber and hemp fiber burn immediately near the flame and burn rapidly. The flame is yellow with blue smoke. The difference between the burning smell and the ashes after burning is that the burning of cotton gives off the smell of paper, and the burning of hemp gives off the smell of plant ash; after burning, cotton has very little powder ash, which is black or gray, and hemp produces a small amount of off-white powder ash.

2. Wool fiber and silk. Wool is smoky when it is burned, it foams when it burns, the burning speed is slower, and it emits the scorching smell of burning hair. After burning, the ashes are mostly shiny black spherical particles, which will shatter when the fingers are pressed. The silk shrinks into a ball when it encounters fire, and the burning speed is slow, accompanied by a sizzling sound, and it emits a scorching smell of hair. After burning, it forms into dark-brown ball-shaped ashes, which shatters when twisted by hand.

3. Nylon and Polyester Nylon, the scientific name of polyamide fiber, quickly crimps and melts into a white gel near the flame. It melts and drips and foams in the flame. There is no flame when it burns. It is difficult to continue burning without the flame, giving off a celery smell. The light brown melt is not easy to grind after cooling. The scientific name of polyester is polyester fiber. It is easy to ignite and melts when it is near the flame. When it burns, it emits black smoke while melting. It shows a yellow flame and emits an aromatic smell. After burning, the ashes are dark brown lumps, which can be broken with fingers.

4. Acrylic fiber and polypropylene fiber Acrylic fiber scientific name polyacrylonitrile fiber. It softens and shrinks near fire. It emits black smoke after a fire. The flame is white. After leaving the flame, it burns quickly and emits the bitter smell of burning meat. The ashes after burning are irregular black hard blocks. , Hand twist and fragile. The scientific name of polypropylene fiber is polypropylene fiber, which melts near the flame and is flammable. It burns slowly and emits black smoke from the fire. The upper end of the flame is yellow and the lower end is blue, emitting a smell of petroleum. The ashes after burning are hard round light yellow brown particles, which are easy to twist by hand. broken.

5. Vinylon and Chlorine Vinylon The scientific name of polyvinyl formal fiber is not easy to ignite. It melts and shrinks near the flame. There is a little flame at the top when it burns. When the fiber is melted into a gelatinous flame, the flame becomes larger, with thick black smoke and a bitter smell. After burning, black beads are left, which can be crushed with fingers. The scientific name of polyvinyl chloride is polyvinyl chloride fiber. It is difficult to burn and extinguishes when it leaves the fire. The flame is yellow, with green white smoke at the bottom, exuding a pungent, pungent and sour smell. After burning, the ashes are dark brown irregular lumps, and fingers are not easy to twist.

6, spandex and fluorine spandex scientific name polyurethane fiber, melting near the fire while burning, the flame is blue when burning, leaving the fire to continue to melt, emitting a special pungent odor, the ashes after burning are soft and fluffy black gray. The scientific name of fluorine fiber is polytetrafluoroethylene fiber. ISO organization calls it fluorite fiber. It only melts near the flame, hard to ignite, and does not burn. The edge flame is blue-green and carbonized, melted and decomposed. The gas is toxic, and the melt is hard round black. Beads. Fluorine fiber is often used in the textile industry to make high-performance sewing threads.

7. Viscose fiber and cuproammonium fiber Viscose fiber is flammable and burns quickly. The flame is yellow and emits the smell of burning paper. After burning, there is little ash, and it is a smooth and twisted ribbon of light gray or off-white fine powder. Copper ammonium fiber, commonly known as tiger kapok, burns near the flame. It burns quickly. The flame is yellow and emits an acid taste. After burning, there is very little ash, only a small amount of gray black ash.