Flash spinning method of non-woven fabric-made dry polymer microfiber plexifilament film fibril tape

The special solvent is used, which can not dissolve the high polymer at normal temperature, and dissolves under high temperature and high pressure. After the raw liquid flows out of the spinneret, the solvent suddenly evaporates (flashes) to form fibers. For example, flash spinning can be carried out using a solution of polyethylene in chloroform.
The solvent spinning process is a patented technology developed by Dupont Company of the United States. It can also be called flash method, flash spinning method and instant solvent evaporation spinning method. Its product name is "Tyvek", which has high strength and tear resistance. Crack, puncture resistance, waterproof and breathable, printable and so on.
Process principle and process:
The LPE was dissolved in methylene chloride at 200 ° C at a concentration of 13%, and saturated with CO 2 at a pressure of 6.9 MPa to prepare a spinning solution, which was then ejected from a knife-shaped orifice, the diameter of the filament tow. At about 1120 dtex, the ejection speed is about 10 to 11 km/min. During the spraying of the tow, the methylene chloride is instantaneously volatilized, the tow is thinned, and a velocity gradient is formed, so that the tow is drawn to form an ultrafine single fiber of 0.11 to 0.17 dtex, and the orientation is extremely high and the strength is very high. Big. At the same time, the electrostatic wire and the coagulation net technology are used to make the fiber into a net, and then the hot-rolled and reinforced to become a solvent-spinning non-woven material.