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Glossary

Ultraviolet Inhibitor (UVI) Ultraviolet Absorber (UVA) Ultraviolet Blocker (UVB) | Vapor or Volatile Corrosion Inhibitor (VCI)Anti-stat | SlipCoefficient of friction (COF)Slip levelAnti-block | Gauge or Mil thickness TreatVentingSinglewound (SW or SWS)Doublewound (DW or DWS)Centerfold (CF)A-wind / B-wind Centerfold bags (Side seal bags) Bottom seal bags | Separated bags (Loose cut) SleevePerforated on roll (POR)CoreGussetedRoll OD | Shrink Mono layerCoextrusion (Coex)Industrial grade (IG) 



Ultraviolet Inhibitor (UVI) – An additive that is designed to protect polyethylene film from
degradation in sunlight, specifically from harmful ultraviolet light.

Ultraviolet Absorber (UVA) Ultraviolet Blocker (UVB) – An additive that is designed to protect
the product encased in polyethylene film from harmful ultraviolet light. Ex. Protect product from color
fade.

Vapor or Volatile Corrosion Inhibitor (VCI) – An additive that is designed to prevent corrosion /rust
of metals encased in polyethylene film.

Anti-stat – An additive that is designed to dissipate static electricity in polyethylene film.

Slip – An additive that is designed to reduce the coefficient of friction of polyethylene film.

Coefficient of friction (COF) – A measure of the amount of resistance that a surface exerts on an
object moving over it.

Slip level – Common term for level of COF – High slip, Medium slip, Low slip, No slip ;

High slip = Low COF, Low slip = High COF

Anti-block – An additive designed to prevent 2 layers of film from sticking together or becoming
“blocked”.

Gauge or Mil thickness – Terms used to reference film thickness. 2 mils = .002”

Treat – Process by which the surface energy of a material is modified. Typically used to promote
bonding of film to inks or adhesives.

Venting – Process of producing film that is designed to allow the escape of air or moisture when
enclosed. Most common vents are circular holes, pinholes (tack vents), or slit vents.

Singlewound (SW or SWS) – Term used to refer to a single layer of sheeting wound onto a roll.

Doublewound (DW or DWS) – Term used to refer to 2 layers of sheeting wound together on a roll.

Centerfold (CF) – Term used to refer to 2 layers of sheeting, connected with a fold on one side, wound
onto a roll.

A-wind / B-wind – Terms used to refer to the unwind positioning of the fold on rolls of CF sheeting.

Centerfold bags (Side seal bags) – Bags that are sealed on opposing sides with a naturally closed end
on the bottom.

Bottom seal bags – Bags that are sealed on the bottom only with naturally closed ends on the
opposing sides.

Separated bags (Loose cut) – Bags that are individually separated and boxed rather than connected
and wound on a roll.

Sleeve – A product with various configurations that is enclosed on two sides and open on the other
two.

Perforated on roll (POR) – Term given for bags, sheets or sleeves that are wound onto a roll.

Core – Cardboard tube that is used to wind up rolls. Cores can come in various diameters and
thicknesses.

Gusseted – Term that refers to the folds in the sides of tubing. The second dimension given for a
gusseted bag identifies the size of the gusset. Ex. A 60”x50”x100” bag would have a 25” side gusset that
unfolds to 50”.

Roll OD – The outside diameter of a roll.

Shrink – Product that is designed to contract in size when heat is applied in order to envelope a
product.

Mono layer – Blown film that utilizes one extruder to produce a single-ply film.

Coextrusion (Coex) – Blown film that utilizes more than one extruder to produce multi-ply films,
where the individual layers are molded together during processing.

Industrial grade (IG) – Polyethylene product that utilizes inexpensive and often times recycled
materials due to the undemanding nature of the application.