A Study Of Theory And The Technical Parameter's Influence On The Flocked Yard In Electrostatic Flocking

In this paper, the flock motion model in an electrostatic flocking yarn process is proposed, and a new flocking yarn equipment is developed, so the flocked yarn is created. According to the fiber charging and the factors influencing flocked yarn packing density are discussed. At the same time, the influences of fiber materials and some processing variables on the flocked yarn density are also studied.Based on an ideal ellipsoid and the forces and moments of gyration acting on a single flock in a uniform electric field, the mechanics of flock transfer and rotation in an electrostatic flock are analyzed. It is shown that the equation of flock moving is a non-uniform acceleration movement. The increase of electric field and the formation of charge on flock is beneficial to enhance the flock moving speed. The rotation of flock in the electrostatic flock is a damping oscillatory but is a periodic movement and tends to the equilibrium position.According to above discussion, it is the best way to select reasonable electrostatic field and charges on flock so that the flock obtain the largest velocity and vertical orientation as soon as possible when enter the ground stuff to improve the quality and effect of flocked yarns .In order to get the better effect of the flocked yarn ,the bond should be chosed suitably, and the ply of the coat is suitable;second, the bigger of the diameter of the yarn, the better effect of the flocked yarn, and vice versa;when the yarn is rotated, it has the better effect than that when the yarn is not rotated;according to the analyse , the speed of the yarn is related with the diameter of the yarn and the maximal density of the flocked yarn. So that ,during the electrostatic flocking ,the three factors should be taken in consideration.A new equipment which develop the flocked yarn is created, and the flocked yarn is developed through it. During the research, the advantage of the equipment is found. The unilateral influence of fiber type, fiber length, fiber fineness, flocking time, voltage and electrode separation on the flocked yarn packing density are also discussed. The results show that the flock-packing density is reduced with the augments of fiber length, fiber fineness and electrode separation, while the effect flocking time and voltage on flock-packing density is on the contrary.The combined impact on flock-packing density is also analyzed in the experiments. The nylon and rayon fibers are studied through the orthogonal layout and variance analysis. The three processing variables such as voltage, electrode separation, flocking time are discussed. The study shows thatthe main factors influencing the flocked yarn packing density for nylon is voltage, flocking time followed by electrode separation, and for rayon is flocking time followed by voltage, electrode separation.The mathematic relationship between the flocked yarn density and electric field, as well as the flocking time is established by multi-element linear regression for nylon and rayon flock. The comparison through experiments shows that the result of theory and practice is consistent on the whole.