Meaning
Mass spectrometry detection relies on the controlled breakdown of molecules to analyze chemical composition. Ion current fragmentation occurs when high energy collisions shatter charged particles into smaller segments, generating a characteristic pattern that allows for the identification of a substance.
Processing Impact
Polymers undergo degradation during high temperature injection moulding if molecular chains split prematurely. Ion current fragmentation provides the analytical basis to detect these split chains in raw material samples, distinguishing between stable virgin resin and material that has suffered thermal abuse during previous processing cycles. Accurate measurement ensures that a moulder receives material with sufficient mechanical integrity to survive the high shear forces of the filling stage.
Material Economics
Regrind quality depends entirely on the stability of the long polymer chains during the initial melt. Producers use the measured results of ion current fragmentation to set the maximum percentage of recycled material that can safely return to the hopper without compromising the final product specifications. This data effectively guards against the inclusion of degraded feedstock that would otherwise lead to brittle parts or premature failure in the field.
Calibration Variance
Datasheet values represent the ideal properties of a polymer under strictly controlled conditions. A moulder often finds the actual ionic behavior during production deviates from these targets due to machine specific screw geometry and residence time variations within the barrel. Frequent monitoring of this fragmentation behavior prevents the drift of process variables before defect rates rise.
