The raw materials are dried and added into the hopper, heated and extruded to form a viscous membrane, and then cooled into the cooling water tank to form a film. Through the heat treatment of the hot plate on the back of the two groups of ovens, under the action of tensile traction, the orientation of the elongated molecules of the flat wire occurs, so that the longitudinal strength of the flat wire is increased, and then the winding.

Linear density is a measure of fiber mass per unit length. The linear density of polypropylene flat filament is defined as the mass of the 1km long flat filament, and the unit is: "Tex". Another definition is the mass of the 9km long flat wire, the unit is: Denier. The higher the linear density is, the wider or thicker the flat wire.