Working in virtually all the facets of lives, friction is an unseen force that permits or stops the movement between two surfaces. Coefficient of friction (COF) is the ratio of the force of friction that makes contact between two objects and a surface. A packaging film’s coefficient of friction gives a relative indication of frictional features. COF is an important physical index of plastic films or sheets.
Flexible packaging films must have a proper coefficient of friction. If the COF is too high, it will need a higher pulling force to loosen up the roll of the plastic film. As a consequence, the production efficiency is in danger and the plastic film may be deformed after it is stretched. And if the COF is too low, the films slip or fall off from the roll, which may stop production leading to unnecessary production cost. The manufacturers must control COF and select appropriate packaging material by conducting COF tests.
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