Use of porous web tape for new type coil construction

The demand for higher reliability electric and electronic components has increased the usage of impregnated coils. This paper describes a new mold-free encapsulation process based on a porous web pressure-sensitive adhesive tape being used both as interlayer insulation and coil cover, that can be applied efficiently with semi-automatic taping machines. The economies gained by utilizing this system should expand the use of impregnated coils to those areas where the quality advantages of an encapsulated system are desirable; yet, the cost has been prohibitive.