|RESPONSE TO CORONA TREATING
Most web materials respond to corona treating to some degree. The degree of response varies
widely according to the composition and condition of the substrate, thickness of the web, relative
age of the material, storage conditions and amount of additives such as anti-block, anti-fog, color
or slip agents.
It should be noted that most additives affect treatability only slightly. On the other hand,
significantly more power is required to treat film with high slip content than with low slip content.
Slip additives are long chain acid amides such as erucamide. The purpose of adding slip to the
polymer formulation is to decrease the coefficient of friction (COF) so that the film surfaces will
not adhere to one another. Slip tends to migrate, or "bloom," to the surface of the film within
24-72 hours as the film cools and crystalizes. Thick gauge film shows more migration than thin
gauge. This layer of slip must be "flashed" off in order to treat the film surfaces and, therefore,
more treater power is required.
Further, excess slip which precipitates out of the film is corrosive, sometimes deliquescent, can
become carbonized, and is often electrically conductive. An accumulation will damage and
shorten the service life of the equipment. It is prudent and economical to use the smallest amount
of slip additive necessary for each application.
The chart below rates the treatability of some common materials according to the power rating
required per square foot at some typical line speeds.
|Solo Systems, Inc.
4001 Industrial Street * Rowlett, TX 75088
800.259.5570 * 972.475.5569
WHAT YOU NEED TO KNOW...
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