Packaging Materials & Components Flashcards

Which property of a packaging material is measured by the Gurley Hill method?

Answer: Air permeability

The Gurley Hill method measures air permeability by timing how long it takes a fixed volume of air to pass through a material sample.

What is the primary function of an ethylene vinyl alcohol (EVOH) layer in multilayer flexible packaging?

Answer: Oxygen barrier

EVOH provides excellent oxygen barrier properties in multilayer structures, extending shelf life of oxygen-sensitive products.

In corrugated board construction, what does 'C-flute' refer to compared to 'B-flute'?

Answer: C-flute is thicker with lower flute count per foot

C-flute is thicker (~4.8mm) and has fewer flutes per foot than B-flute, providing greater stacking strength.

Which type of closure is most appropriate for a child-resistant pharmaceutical package under 16 CFR 1700?

Answer: Press-and-turn cap

Press-and-turn caps are the most common child-resistant closure meeting CPSC requirements under 16 CFR 1700.

What is the key difference between low-density polyethylene (LDPE) and high-density polyethylene (HDPE) in packaging applications?

Answer: HDPE has higher crystallinity and stiffness; LDPE is more flexible

HDPE has higher crystallinity, resulting in greater stiffness and chemical resistance, while LDPE's branched structure makes it more flexible.

Which paperboard grade is most commonly used for folding cartons in food packaging?

Answer: Solid bleached sulfate (SBS)

Solid bleached sulfate (SBS) is preferred for food folding cartons due to its brightness, cleanliness, and FDA compliance for food contact.

What does the term 'caliper' refer to when measuring packaging materials?

Answer: The thickness of the material

Caliper refers to the thickness of a packaging material, typically measured in points (0.001 inch) or millimeters.