BOPA aka OPAE   Bi-axial Oriented Nylon/Polyethylene: where the film is stretched in both directions (MD & TD) while being cured
COEX / Co-Extrusion   Fabrication of a multi-layer film by pumping the various materials through separate extruders and then merging the extrudates into a common die assembly.
Sous Vide   Directly translated : “under vacuum” Pre-prepared vacuum-sealed portions of food are cooked in water baths at regulated temperatures, providing consistent results every time. Ideal both for mass catering and for a quick, easy and healthy option in the home.
Dart Drop   A method of measuring a film’s impact strength or dynamic toughness. A hemispherical shaped, weighted “dart” is dropped onto a film sample.
Die   A device used in extrusion processes to shape the extrudate.
Elastic Recovery / Elasticity   The ability of a material to return to its original shapes or sizes after having been deformed or subjected to strain.
EVOH - Ethylene-vinyl alcohol   One of the best polymeric oxygen barriers for packaging.
Extrusion   The process of feeding, melting, and pumping a material such that a desired shape or configuration can be created.
FIN Seal   Where the two sides of film are sealed inside/inside, creating a fin like appearance.
Flexographic Printing   A method of printing using flexible rubber or photopolymer plates.
FFS – Form Fill Seal   A method of packaging where the flat film (rollstock) is formed either horizontally or vertically then filled and sealed.
Gauge   Used as a synonym for film thickness or film caliper. Sometimes expressed as 80 gauge or 100 gauge.
Gauge Band   A conformation irregularity found in rolls of material.
Gloss   The shine or “sparkle” of a surface. In LDPE film, it is described as the amount of light reflected from the surface.
High Barrier   Film that has very low gas permeability characteristics.
LAP Seal   Where the two sides of film are over-lapped and sealed (inside/outside)
LDPE – Low Density Polyethylene   Used mainly for heat-seal ability and bulk packaging.
LLDPE - Linear Low Density Polyethylene   Excellent heat resistant properties, utilized in packaging that will be subjected to high heat.
MD - Machine Direction   The direction that the film moves through the packaging equipment.
MAP aka Gas Flush   Modified Atmosphere Packaging: where an inert gas mixture is introduced to extend the shelf life of the packaged product.
Metallocene Sealant   Metallocene is a special grade of polyethylene which was designed to compete with surlyn.It seals well through contaminates and has a lower seal initiation temperature.
Micron   A unit of length equal to one millionth of a meter (micron = mil x 25.4)
MVTRMoisture Vapor Transmission Rate   A depreciated term, expressed in grams/100 sq. inches/24 hour observation.
Mylar Film   Trade name for Duponts PET (polyester) film
OPAE aka BOPA   Bi-axial Oriented Nylon/Polyethylene: where the film is stretched in both directions while being cured.
OPE   Oriented polypropylene/ultra low density polyethylene
OTR - Oxygen Transmission Rate   Measurement of ‘breathability’ of a film: expressed in units per cc/100 square inches/24 hour observation.
PAE – Nylon Poly   The standard structure utilized in vacuum packaging.
PE   Polyethylene
PMSPantone Matching System   This is the universally accepted colour definition system required to ensure the continuity of replicated colours.
PP   Polypropylene
Rotogravure Printing   A method of printing where the image to be printed is etched on the surface of a metal cylinder for transfer to film. This method provides for a sharper or clearer detailed final image.
Stretchability   A combination of factors related to the ability of a material to be stretched or elongated. (i.e. how easily does a film stretch, how much will it stretch, does it return to its original length?)
Surlyn Sealant   Surlyn resin was developed by Dupont as a sealant which sealed well/better through fats and oils.This sealant requires high seal initiation temperatures to seal.
Tear Resistance   Refer’s to the resistance of the film to be torn. This is quantified by Elmendorf Tear testing, and is measured as the force required to propagate an initiated tear in the MD or TD direction.
Thermoforming   A method of packaging where the bottom film (Forming Film) is formed utilizing heat and pressure to create a cavity where the product is placed and then sealed on top (Non-Forming Film)
TD - Transverse Direction   Direction across the film web.
VFFSVertical Form Fill Seal   A method of packaging where the flat film (rollstock) is formed into a tube vertically and the product is dropped into to the pre-formed package and then sealed.
Film Web   The width of the film lying flat, generally expressed in mm’s.
Zippering   Lack of resistance to tear propagation or an initiated TD cut or tear. Once the film has been torn or cut, the resulting slip rapidly opens and completes a full web break