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Adhesion
The state of sticking together two or more materials.
Aluminum Foil Laminations
A combination of aluminum foil with a paper backing used as a barrier and often combined by means of an adhesive or extruded polyethylene.
Angle of Slide
The angle at which solid materials will begin to slide or flow from the horizontal.
Back Seam Woven Bag
A woven bag that contains a seam on its backside.
Basis Weight
The weight in pounds or grams of a given area of paper.
Biaxially Oriented polypropylene (BOPP)
A polypropylene film that has been stretched in both the machine and cross directions.
Biodegradable
The ability to break down through the action of a naturally occurring microorganism over a period of time
Bursting Strength
The point at which a bag will rip due to high pressure, expressed in pounds per square inch.
Carbon Footprint
A measure of the impact had on the environment in terms of the amount of greenhouse gases produced.
Clean Strip®
Easy open tear strip feature of film reap wrap produced by Coating Excellence International.
Coefficient of Friction (COF)
The force maintaining contact between an object and a surface divided by the frictional force resisting the motion of the object.
Coextrusion
Simultaneous extrusion of two or more plastic layers together to form a single multilayered film.
Cold seal
Sealing a packaging product by the use of pressure as compared to heat.
Core
A tube around which a roll of paper, film or foil is wound.
Cure time
The time required for a material to set at a given temperature and humidity
Degradable
The ability to break down through chemical reactions
Delamination
The separation of the components of a laminated material.
Denier
A unit of weight indicating the fineness of fiber filaments and yarns, both silk and synthetic, and equal to a yarn weighing one gram per each 9,000 meters
Density
The weight per unit of volume.
Drop Test
Determining bag strength by dropping filled bags from predetermined heights and positions until failure occurs.
Easy open tear strip
A strip of material, normally plastic, fastened under a bag closing tape, used to pull across the top of a roll/fold/tape bag as an easy open feature.
Extrusion
The process of melting resin to apply to paper or to bond film or foil to woven material.
Face Width
The width of the front side of a bag.
Fill End
The portion of a bag that is left open so that contents can be added into the bag before sealing
Flexible Packaging
Packaging that utilizes materials such as paper, foil, film, etc.
Flexography
A printing style that utilizes flexible printing plates made of rubber or plastic that contain a measured amount of ink. The plates rotate, contacting the print material and transferring ink.
Gauge
Caliper or thickness expressed as 100 times millage. e.g. 1 mil = 100ga
Gusset
The side portion of a bag which allows for volume.
Heat Seal
To bond together with heat and pressure
Hot Melt Adhesive
A thermoplastic adhesive composed of polymers, resins, and/or waxes.
Impact Strength
The amount of impact a bag can withstand before it tears.
Ink Receptivity
The ability of a surface to absorb ink.
Kinetic COF
The force needed to keep an object moving once it is started in motion.
Lamination
Combining multiple layers of material into a single structure.
Machine Direction
The direction of paper parallel to its forward movement on the machine.
Metallized
A very thin coating of metal deposited on film or foil.
Moisture Barrier
Prevents the movement of moisture from one area to another
Moisture Content
The percentage of water in a material.
Moisture Vapor Transmission Rate
The rate of grams of moisture that will pass through an area of 100 sq in of barrier material in a 24 hour period expressed as gm/100 sq in/24 hr.
Offset Printing
A method of printing where inks are transferred from a plate to a rubber blanket, and then onto the printing surface.
Opacity
The degree of clarity of a surface.
Oxygen Transmission Rate
The rate in cubic centimeters that pure oxygen will pass through an area of 100 Sq in of barrier material in 24 hours, expressed as: cc/100sq in/24 hr.
Packaging Converter
A company that converts packaging materials into finished products.
Palatability
The degree that packaging materials affect the taste of the contents inside.
Pinch bottom bag
A bag formed with adhesive applied to an extended lip on the bag opening along with part of the bag face. That part of the bag can then be heated to re-activate the adhesive after filling, folded over the bag opening and pinched to close the bag.
Poly
A generic term for polyolefins, including polyethylene and polypropylene.
Polyethylene
A thermoplastic material composed solely of polymers of ethylene abbreviated PE.
Polypropylene
Any of various thermoplastic resins that are polymers of propylene. They are hard and tough, and are used to make molded articles, packaging materials and fibers.
Post Gusseting
The operation of forming a longitudinal tuck or gusset into each side of a continuous tube of material. This is typically done in a secondary operation after the material has been formed into a tube. The gussets typically form the sides of a bag which is closed on one end prior to filling.
Proof
A trial print that is taken for examination or correction before mass printing.
Ream
A term used to denote 500 sheets of industrial paper 24" x 36" or 3000 square feet of paper.
Recyclable
The ability to be treated or processed to be made suitable for reuse
Repeat Length
The length of a print on a finished roll.
Roll/fold/glue
An operation done to the top or bottom of a side gusseted bag, in which the bag is folded over twice in the same direction and glued in position to close off the bag.
Roll/fold/tape
An operation done to the top or bottom of a side gusseted bag, in which the bag is folded over twice in the same direction and taped in position to close off the bag.
Seal Strength
The force a seal can withstand before it breaks apart.
Sewn Closure
A method of closing filled bags with a special sewing machine.
Shear strength
The strength of a material or component against the type of yield or structural failure where the material or component fails along a plane as a result of forces acting parallel to the plane.
Slide Zipper
A plastic zipper profile and slider used to close and open the top of a bag. Moving the slider along the zipper profile will open or close the bag top.
Static COF
The force needed to start an object's movement.
Substrate
Any material such as paper, film and foil to which adhesives, inks or coating are applied
Sustainability
Incorporating environmentally friendly practices to help maintain the environment.
Tearing Strength
The force required to tear a bag.
Tensile strength
The maximum load that a material can support without fracture when being stretched.
Tubular Woven Bag
A woven bag that contains no seams.
Water Vapor Transmission Rate
The grams of moisture that will pass through an area of 100 sq in of material in a 24 hour period, expressed as gm/100 sq in/24 hr.
Web
The material from a roll as it moves through a converting machine.
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