Dispersion Quality
Pigment distribution assessment provides the framework for quantifying how additives and fillers integrate within polymer matrices used for manufacturing high-quality plastic films and rigid packaging components. The procedure known as en 13900-5 evaluates the dispersion state of pigments through the pressure filtration method, which measures the pressure rise across a fine filter screen as a polymer melt flows through it under controlled conditions. This protocol establishes the necessary correlation between particle agglomeration and the flow resistance observed during extrusion or injection molding processes.
High dispersion quality prevents defects such as streaks or pinholes in thin gauge packaging substrates that would compromise barrier properties.
Filter Integrity
Accurate testing relies on the standardized measurement of the pressure increase across a mesh screen of specific aperture size to determine the filter pressure value. Technicians monitor the pressure transducer output while maintaining constant throughput, as any deviation in melt viscosity or temperature alters the base line and obscures the pigment particle impact. Consistent test results depend on the use of masterbatch samples prepared under strict concentration limits to ensure the screen does not block prematurely during the run.
Reliable data generation requires precise control over the heating zones of the laboratory extruder and the consistency of the polymer resin carrier.
Production Impact
Process engineers utilize these findings to validate the quality of incoming color masterbatches before they enter the high-speed converting line. Excessive pressure buildup indicates poor pigment wetting or high levels of coarse agglomerates, which necessitate adjustments in downstream filtration or a switch in formulation strategy to protect delicate gear pumps and expensive die geometries from damage. A stable pressure filtration result confirms that the material will flow uniformly without causing mechanical downtime or surface failures in the finished goods.
The measurement provides a definitive threshold for acceptable feedstock performance in industrial plastics transformation.
