Allied & ICAR Exam Bank • ALLIED_0988
MCQ • 1 Mark
Section 7: Dairy and Food Engineering
Food Packaging Technology
Subtopic: Food Packaging and Storage
Question Statement:
In a standard three-layer flexible retort pouch (Outer PET / Middle Aluminum Foil / Inner CPP), the inner Cast Polypropylene (CPP) layer functions to:
Options:
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(A) Provide a food-contact heat sealable layer with exceptional thermal stability able to withstand steam retorting at $121-135^\circ\text{C}$
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(B) Block ultraviolet light
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(C) Provide printable shiny outer gloss
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(D) Dissolve in hot water
Step-by-Step Solution & Explanation
Outer oriented polyester (PET) provides puncture resistance and printability; aluminum foil ($9-12\text{ \mu m}$) provides near-zero gas/light permeability; inner unoriented cast polypropylene ($70-100\text{ \mu m}$) provides an inert, robust hermetic heat seal that withstands retort steam autoclaving.
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