Quiz on Plastic Additives and Properties Flashcards
Inhibit degradation during thermal processing.
Heat stabilizer
Encourage the formation of crystallinity
Nucleating agents
Impart cross links in the polymer chain.
Cross-linking agents
Added to impart color.
Pigments
Used to create expanded plastic foams.
Blowing agents
Used for UV sensitive plastics.
UV Stabilizers
Reduce frictional properties and allows films to slide smoothly.
Slip agents
Prevent film layers in rolls from sticking together.
Antiblock agents
Enable materials to dissipate static electrical charges.
Antistatic agents
Improve flow and processing properties.
Lubricants
This property is one big consideration especially when packaging aggressive products like cosmetics or household cleaning products.
Chemical compatibility
This is measured by an Elmendorf tester.
Tear strength
This property is determined by temperature, pressure, and dwell time.
Seal strength
Concerned with the readability of print.
Haze and gloss
Juice powders are hygroscopic, hence they should not be wet. What property of a polymers is most important when packaging juice powders?
Moisture vapor transmission rate
Carbonated soda tastes stale if they lose their carbonation. What property of a polymers is most important in this case?
Gas transmission rate
What property is needed the most for plastic strapping?
Tensile strength
The material’s ability to resist a direct shock.
Impact strength
Related to how slippery a film is.
Coefficient of friction
A low value is desirable if you have printing register or marks.
Moisture vapor transmission rate
