A special solvent is used, which cannot dissolve the polymer at normal temperature and dissolves under high temperature and pressure. After the raw solution flows out of the spinneret, the solvent suddenly evaporates (flashes) to form fibers. For example, a solution of polyethylene in chloroform can be used for flash spinning.
Solvent spinning web forming process is a patented technology developed by Dupont in the United States. It can also be called flash evaporation method, flash spinning method and instant solvent volatilization spinning web forming method. Its product name is "Tyvek", which has high strength and tear resistance Crack, puncture resistance, waterproof and breathable, printable and other characteristics.
Process principle and process:
Dissolve LPE in dichloromethane at 200 ℃, with a concentration of 13%, and saturate with CO2 at a pressure of 6.9Mpa to make a spinning solution, and then spray it out from the knife-shaped spinneret hole. The diameter of the filament bundle About 1120dtex, the ejection speed is about 10 ~ 11km / min. During the tow spraying process, dichloromethane evaporates instantly, the tow becomes thinner, and a velocity gradient is formed, so that the tow is drawn, forming 0.11 ~ 0.17dtex ultra-fine single fibers, which have extremely high degree of orientation and high strength. Big. At the same time, electrostatic spinning and coagulation technology are used to make the fiber into a net, and then it is hot-rolled and strengthened to become a solvent-spinning non-woven material.
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