Flexible Packaging Glossary - M
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- machinabilityThe ability of a film to run on packaging equipment.
- Machine Direction (MD)The direction parallel to a material's flow through a machine. Flow direction through a machine may impart directional properties to a material.
- manufacturing tolerancePermissible variations from rated or marked capacities or dimensions established by standards or specifications for those.
- Maximum Fill TemperatureThe maximum product temperature that this fitment is rated for.
- MDPE Medium density, (0.934-0.95) polyethylene. Has higher stiffness, higher melting point and better water vapor barrier properties.
- metallizeAppying a thin coating of metal to a nommetallic surface by chemical deposition or by exposing the surface to vaporized metal in a vacuum chamber.
- MET-OPP Metallized OPP film. It has all the good properties of OPP film, plus much improved oxygen and water vapor barrier properties, (but not as good as MET-PET).
- MET-PETMetallized PET film. It has all the good properties of PET film, plus much improved oxygen and water vapor barrier properties. However, it is not transparent.
- MicronA depreciated, although still used, term for micrometer. One millimetre = 1,000 micrometres.
- MilA thousandth of an inch. Example: A 0.60 mil film is 0.0006 inches in thickness.
- Moisture TransmissionThe amount of moisture that is capable of permeating through a given area of film per day. Units are in grams of moisture per 100 in2 of film per 24 hour period.
- moisture vapor transmission rate (MVTR)A depreciated term, usually measured at 100% relative humidity, expressed in grams/100 square inches/24 hours, (or grams/square meter/24 Hrs.) See WVTR.
- Monoaxial OrientationOrientation of plastic films by stretching in one direction, (machine or cross machine direction) only. These films are generally much stronger and stiffer, but have very poor tear strength in the direction of orientation.
- Mylar™Mylar is a registered trademark of the Dupont-Teijin Corporation. Is the industrial brand name for that corporation's polyester (PET) film. Polyester film is a staple of multi-layer packaging for a wide variety of applications.