Absorption of organic volatiles by sealant films

The absorption of organic volatile compounds by plastic films was investigated, and the influence of the absorption of these compounds on the mechanical properties of the plastic films as a function of sorbed concentration levels was evaluated. Sample strips of polyethylene (LDPE), ethylene vinyl alcohol copolymer (EVOH) and co-polyester (Co- PET) were immersed in juice. Absorption of d-limonene by Co- PET was significantly lower in comparison to that of the other two films.; The sorption of d-limonene by plastics affected the (a) modulus of elasticity (EVOH, Co- PET), (b) yield stress (EVOH), (c) stress at 100% elongation (LDPE, EVOH), (d) heat seal strength (LDPE), and (e) impact resistance (EVOH, LDPE). The plastics varied their properties due to sorption of flavor component.