PRACTICAL ASPECTS OF DETERMINING THE INTENSITY OF CORONA TREATMENT

Determining surface tension after preparation of substrates for printing, coating, extrusion coating, or laminating involves techniques for assuring accurate, consistent results. Caution should be exercised in using testing solutions to determine toxic dyne concentration. In the reported experiments, attempts have been made to develop an in-line surface tension testing method to close a loop with a computerized corona treating system, thus increasing the power output in conjunction with increased need for watt density. At this time no such in-line testing system has been developed. The demand for such a testing method will undoubtedly cause the industry to continue its search.