Generally, it is simple and easy to use the combustion […]
Generally, it is simple and easy to use the combustion method to identify fibers, but it is not easy to judge blended products. It is necessary to extract one yarn from the warp and weft directions (that is, the straight and horizontal directions) and burn them separately. Disassemble several warp and weft yarns of two unknown types of webbing and burn them with a lighter respectively. Observe some physical phenomena during the burning process to determine the raw materials of warp and weft yarns. When burning, observe the flame, melting, smell, and ashes after burning. The following are the burning physical performance parameters of webbing, ribbon or satin materials. When using the burning identification method, you can refer to them:
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. Nylon and polyester Polyamide fiber, which is the scientific name of nylon (nylon), quickly crimps and melts into a white gel near the flame. It melts and drops and foams in the flame. There is no flame when it burns, and it is difficult to continue burning without the flame. Celery flavor, the light brown melt is not easy to grind after cooling. Polyester, the scientific name of polyester, is easy to ignite. It melts when it is near the flame. When it burns, it emits black smoke while melting. It has a yellow flame and emits an aromatic smell. After burning, the ashes are dark brown lumps, which can be twisted with fingers. Nylon webbing: near flame, it melts, melts, drips and foams, does not continue to burn, celery-like, hard, round, light, brown to gray, and bead-like. Polyester webbing: near flame, that is, shrinking, melting, dripping and foaming, can continue to burn, a few smoke, very weak sweetness, hard round, black or light brown.
3. Acrylic and polypropylene Acrylic fiber is the scientific name of polyacrylonitrile fiber, which softens and shrinks near fire, and emits black smoke after a fire. The flame is white. After leaving the flame, it burns quickly and emits a bitter smell of burning meat. After burning, the ashes are irregular black lumps , 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.
4. Vinylon and Chlorinated Vinylon The scientific name of Vinylon is polyvinyl formal fiber, which 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 gel, 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 fiber is polyvinyl chloride fiber. It is difficult to burn and extinguishes when you leave 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. To
5. Spandex and Fluorine Polyurethane fiber, the scientific name of spandex, is melted and burned near the fire. The flame is blue when burning. It will continue to melt away from the fire and emit a special pungent odor. After burning, the ashes are soft and fluffy black gray. The scientific name of fluorine fiber is polytetrafluoroethylene fiber, which is also called fluorite fiber. It only melts near the flame, is difficult to ignite, does not burn, and the edge of the flame is blue-green carbonized, melted and decomposed, the gas is toxic, and the melt is hard round black beads . Fluorine fibers are often used in the textile industry to make high-performance sewing threads.