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Polyethylene Plastic PE Films Glossary

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COF

COEFFICIENT OF FRICTION   

      

While COF is usually measured film-to-film which makes sense for applications such as beverage shrink wrap, the interface is usually between film and stainless steel in VFFS vertical form / fill / seal, HFFS horizontal form / fill / seal and bakery bread applications. Stainless steel has a high surface energy of around 75 dynes, so it is reasonable to expect different results vis-à-vis film-to-film.





What is high slip, medium slip and low slip?

The Flexible Packaging Association defines the ranges of slip (high, mediuim and low) and the kinetic coefficient of friction, when tested, film-to-film, in accordance with ASTM D 1984, as follows:

Surface                C.O.F.

1. Low Slip            Greater than 0.5

2. Medium Slip      0.2 to 0.5

3. High Slip           Less than 0.2