Coatings 2025 , 15 , 214
9of 14
remarks the difficulty of achieving combined barrier properties with such low coat weights and emphasises the potential of S-POP and A-POP in the barrier packaging industry.
Figure 4. Barrier performance of coated samples. ( a ) Comparison of water vapour transmission rates (WVTR) of coated samples related to base papers at 23 ◦ C and 50% RH and ( b ) at 23 ◦ C and 80% RH. ( c ) Oxygen transmission rates (OTR) of the samples S-POP and A-POP at 23 ◦ C and 0/50% RH. ( d ) Heptane vapour transmission rates (HVTR) of the samples S-POP and A-POP and base papers at 23 ◦ C and 50% RH. Table 2. Comparison of water vapour transmission rates (WVTR) and oxygen transmission rates (OTR) at 23 ◦ C and 50% RH between the samples S-POP (blue) and A-POP (green) and other common barrier packaging materials (white) [36]. The WVTR and OTR values of reference materials (white) are normalised to the thickness of 10 μ m, which is comparable to the coating thicknesses in this work.
WVTRg/(m 2 · Day)
OTRcc/(m 2 · Day)
Sample S-POP A-POP
15 12
3.8
29
CNF
220
4.8 200
Chitosan
1800
LDPE
16
25,000
PET
149
110
PP
60
11,000
EVOH
750 0.35
4.5
Metallised PET
1
Food packaging should incorporate effective barriers against grease, oil, and mineral oil to ensure product safety, maintain product quality, and protect consumer health. Grease and oil from food products can cause the structural weakening of packaging, leading to
Made with FlippingBook interactive PDF creator