Managing Dual Use Additives Information Flow in Plastic Packaging Declarations
Dual use additive management demands specific identity flow from resin compounders to food packers to satisfy direct food additive maximum limits.
Slip Additive
Meaning
Migratory fatty acid amides reduce the coefficient of friction on the surface of plastic parts and films. A slip additive works by blooming to the surface after the moulding or extrusion process is complete. Lubrication prevents sticking in the mould and ensures smooth movement on conveyor systems.
Migration Rate
Time and temperature govern the movement of the additive from the bulk polymer to the surface. A slip additive like erucamide or oleamide is chosen based on how quickly the effect is needed. Fast-blooming grades provide immediate results but may rub off more easily during handling.
Durability depends on the molecular weight and the cooling rate of the part.
Friction Coefficient
Measurements of the force required to start and maintain motion determine the effectiveness of the treatment. A well-dosed slip additive can lower the friction of a polyolefin by more than half. Precise levels are critical for high-speed automated assembly and packaging.
Monitoring ensures the part remains within the friction specifications throughout its shelf life.
Secondary Interaction
Surface chemistry can be altered in ways that affect the adhesion of inks or glues. If the concentration of the slip additive is too high, it may interfere with the corona treatment or the bonding of a laminate. Precisions are required to balance handleability with the needs of the final assembly.
Balanced dosing ensures the part performs as expected during decoration and secondary bonding.