What is a Machine Direction Orienter?

What is a Machine Direction Orienter?

A Machine Direction Orienter (MDO) is a relatively straight forward device which heats a plastic film or sheet and then applies a longitudinal stretching force through a series of rollers rotating at different surface speeds.machine direction orientation This orientation process down-gauges the thickness of the film and often improves physical properties such as tensile strength, modulus, elongation, clarity, haze, shrinkage, oxygen barrier and water vapor barrier among others.

Orientation is measured by measuring transmission at non-normal incidence for radiation polarized in the Machine or Transverse directions.machine direction orientation This method requires that the spectral components from crystalline regions overlap with those from amorphous areas. Figure 3 compares the spectra for an isotropic (3M card) and a blown LDPE film used in freezer bags. The band at 719 cm-1 for the blown film is strongly oriented in the transverse and normal directions.

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