Meaning
Additive breakdown processes reduce the efficacy of surface-modifying chemicals over time or under extreme environmental conditions. slip agent degradation refers to the chemical or physical loss of fatty acid amides that normally migrate to the surface to lower the coefficient of friction, and it continues until the additive can no longer form a continuous lubricating film.
Thermal Loss
High temperatures in the extruder can cause the slip molecules to evaporate or break apart. If the melt temperature is too high, the additive never reaches the surface in the correct concentration. This loss is especially common in thin films where the surface-to-volume ratio is very high.
Surface Friction
Breakdown products often have a higher affinity for the polymer matrix than the original slip agent. This attraction prevents the remaining molecules from migrating to the air-polymer interface. The result is a film that feels tacky and is difficult to separate on a high-speed packaging line.
Storage Stability
Long-term exposure to heat and humidity in a warehouse can trigger the degradation of additives inside a finished roll. The slip effect might be perfect immediately after production but disappear after three months of storage. Regular testing of the coefficient of friction is necessary to ensure the product remains within the specification.
