Module 3 - Quiz (Plastic Additives & Properties) Flashcards
Additives: Inhibit degradation during thermal processing.
Heat stabilizer
Additives: Encourage the formation of crystallinity.
Nucleating agents
Additives: Impart cross links in the polymer chain.
Cross-linking agents
Additives: Added to impart color.
Pigments
Additives: Used to create expanded plastic foams.
Blowing agents
Additives: Used for UV sensitive plastics.
UV Stabilizers
Additives: Reduce frictional properties and allows films to slide smoothly.
Slip agents
Additives: Prevent film layers in rolls from sticking together.
Antiblock agents
Additives: Enable materials to dissipate static electrical charges.
Antistatic agents
Additives: Improve flow and processing properties.
Lubricants
Characterizing Plastics
This property is one big consideration especially when packaging aggressive products like cosmetics or household cleaning products.
Chemical compatibility
Characterizing Plastics
This is measured by an Elmendorf tester.
Tear strength
Characterizing Plastics
This property is determined by temperature, pressure, and dwell time.
Seal strength
Characterizing Plastics
Concerned with the readability of print.
Haze and gloss
Characterizing Plastics
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
Characterizing Plastics
Carbonated soda tastes stale if they lose their carbonation. What property of a polymers is most important in this case?
Gas transmission rate
Characterizing Plastics
What property is needed the most for plastic strapping?
Tensile strength
Characterizing Plastics
The material’s ability to resist a direct shock.
Impact strength
Characterizing Plastics
Related to how slippery a film is.
Coefficient of friction
Characterizing Plastics
A low value is desirable if you have printing register or marks.
Tensile Strength
Additives: protect the resin from deteriorating during thermal processing.
Antioxidants
Additives: impart flexibility or softness and assist in processing
Plasticizers
Additives: improve mechanical properties and reduce cold-flow characteristics.
Mineral fillers
