By Charlie Acquista, Sr. Process Engineer, Adchem Corporation, Riverhead, NY
Converters of non-conductive web surfaces, such as pressure sensitive adhesive (PSA) tapes, need to vigilantly control static electricity. High levels of electrostatic charges can be dangerous, and even moderate levels can permanently destroy an adhesive system, cause fouling and jamming of production processes, and damage to finished products. New technology allowing faster production speeds exacerbates static-related problems.
Static electricity is an accumulation of electrical charges on a surface. As surfaces are in contact with each other, a transfer of electrons occurs. Friction, pressure and web speed will accelerate this transfer. When separated, the surface which has gained electrons becomes negatively charged, and the mating surface giving up the electrons becomes positively charged.