Food Engineering/Packaging & Labeling

• Mass Transport through Food Packaging Polymers:
• Pressure dependence: Gas permeability ($P = D \times S$) through polymeric barriers increases as pressure differential increases due to higher gas solubility and matrix plasticization.
• Temperature dependence: Gas diffusion coefficient increases exponentially with temperature according to Arrhenius kinetics ($D = D_0 e^{-E_d/RT}$).
• Polymer polarity: Non-polar hydrocarbon polymers (Polyethylene - LDPE/HDPE, Polypropylene) lack hydrophilic groups, exhibiting excellent water vapor barrier properties (low WVTR).
• Statement C is false: Polar polymers (EVOH, cellophane, polyamide) absorb moisture and possess poor water barrier properties.
• Conclusion: A, B, D only (Option 2).

Correct option: (2) A.B,D only

• Corrugated Fibreboard Flute Geometry:
• Type A Flute Specifications:
• Features approximately $32 - 38$ flutes per linear foot ($105 - 125\text{ flutes/m}$) and a flute height of $4.5 - 4.8\text{ mm}$.
• Offers the greatest vertical crush resistance and cushioning protection among standard paperboard flutes.
• (Type B has $47 - 53\text{ flutes/ft}$, Type C has $39 - 45\text{ flutes/ft}$, Type E has $90 - 100\text{ flutes/ft}$).
• Conclusion: 32-38 (Option 4).

Correct option: (4) 32.38

• Barrier Layer in Aseptic Beverage Packaging (Tetra Pak):
• Aluminum Foil Barrier:
• Aseptic Tetra Pak cartons incorporate an aluminum foil layer to provide an absolute hermetic barrier against light, oxygen, and external vapors.
• Official Answer Key: Designated 0.09 mm (Option 1) as the credited answer.
• Conclusion: 0.09mm (Option 1).

Correct option: (1) 0.09mm