Post-Consumer Polyester Non-Aqueous Volatile Desorption Kinetics Baseline
Non-aqueous volatile desorption kinetics in post-consumer polyester depend on flake thickness, Arrhenius diffusion limits, and sweep gas partial pressures.
Organoleptic Failure
Meaning
Undesired sensory changes in a product caused by the migration of substances from its plastic packaging is a major quality concern. Organoleptic failure is typically detected through smell or taste tests rather than mechanical measurements. This issue is most common in food, beverage, medical and pharmaceutical applications.
Volatile Migration
Small molecules within the polymer, such as residual monomers or additives, can leach into the contents over time. When these chemicals cause a noticeable off-flavor, it is classified as organoleptic failure. Identifying the source of these volatiles often requires advanced laboratory techniques like gas chromatography.
Even trace amounts of a contaminant can trigger a rejection of the entire production lot.
Purity Standard
Manufacturers must choose high-purity grades of resin to minimize the risk of contamination. Recycled materials are more prone to organoleptic failure because they may contain residues from their previous life. Virgin resins with low volatile content are preferred for sensitive applications like bottled water.
Processing Heat
Excessive temperatures during injection molding or extrusion can break down the polymer and create new odorous compounds. Monitoring the melt temperature is a critical defense against organoleptic failure in a production environment. Even a small amount of degraded material can ruin a large batch of finished products.