Groundwork for Non Intentionally Added Photoinitiator Identification in Polyolefin Streams
Groundwork for identifying non-intentionally added photoinitiators in polyolefins requires high-resolution mass spectrometry and toxicological screening.
Deinking Efficiency
Meaning
Performance ratio quantifying the effectiveness of removing pigments and resins from a plastic substrate during mechanical recycling. It measures the visual and chemical purity of the resulting flakes and stops applying when the material meets the color specification for the next production run.
Pigment Removal
Visual and chemical analysis determines how much ink remains on the surface after a standard washing cycle. High deinking efficiency ensures that the recycled flakes do not carry residual colour that would tint the next batch of resin. The process often involves alkaline solutions and specific surfactants.
Successful removal prevents the formation of dark spots in the final moulded part.
Resin Purity
Measurement of the final melt transparency shows the impact of any leftover coating particles. Because deinking efficiency affects the mechanical properties of the recyclate, it is a factor in determining the economic value of the waste stream. Contaminated flakes produce parts with lower tensile strength and reduced elongation.
Recyclate Value
Higher levels of ink removal allow the material to be used in applications like clear packaging or white bottles. Buyers pay a premium for pellets that match the optical properties of virgin resin. Consistent performance in this metric is necessary for the circular economy to function.