Permeability of Food Packaging Polymers Quiz

Which polymer offers low oxygen barrier?

• PET

• PP

• PE

• EVOH

What type of polymers deteriorates in gas permeability under high relative humidity conditions?

• PP

• PET

• EVOH

• PE

Which factor improves the gas and vapor barrier of polymers?

• Increasing regularity of molecular structure

• Increasing light exposure

• Increasing temperature

• Increasing humidity

What type of fillers are used to increase permeability in polyolefin films for fresh produce packaging applications?

• Inert fillers

• Plastic fillers

• Organic fillers

• Metallic fillers

Permeabilities of most inert gases are independent of permeant concentration. (True/False)

• True

• False

What causes CO2 to permeate faster than O2 through the polymer matrix?

• Lower diffusivity

• Lower solubility

• Higher diffusivity

• Higher solubility

What type of leaks involve minute channels in defective seal areas caused by improper sealing conditions?

• Pinholes

• Channel leaks

• Cracks

• Tears

Diffusion velocity in gases, liquids and solids are in the order of:

• 0.5, 10, 0.00001

• 0.00001, 0.5, 10

• 10, 0.00001, 0.5

• 0.5, 0.00001, 10

What is the main reason to prevent both pinholes and channel leaks in food packaging?

• To increase gas barrier

• To decrease gas barrier

• To improve aesthetics

• To reduce cost