In aseptic packaging of commercial UHT milk cartons (e.g., Tetra Brik Aseptic), the multilayer laminate structure incorporates aluminum foil primarily to provide an impermeable barrier against:
Options:
(A) Light, oxygen, and moisture vapor transmission
(B) Mechanical crushing only
(C) Electric magnetic fields
(D) Thermal expansion
Answer Key:
A
Step-by-Step Solution & Explanation
Aluminum foil ($6.3\;\mu\text{m}$) functions as a near-absolute barrier against light (preventing riboflavin photo-oxidation) and oxygen migration, granting ambient shelf life without refrigeration.