Short fibers, cut from natural or synthetic fibers, are spread onto a fabric surface coated with adhesive; the fabric is then cured. The flock fiber spreading may be carried out mechanically, or with electrostatic forces. In the electrostatic process, electrical field forces help to align the flock fibers perpendicularly to the fabric surface.
References for this information:
Textiles and Fashion Materials, Design and Technology, 2015, Pages 337-354