Exam (elaborations)
INTRO TO PACKAGING FINAL EXAM QUESTIONS AND ANSWERS
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INTRO TO PACKAGING FINAL EXAM QUESTIONS AND ANSWERS
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1-92 of 92Describe the flow characteristics of a thixotropic fluid.
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In thixotropic fluids, the resistance to movement changes with the shear
rate of the fluid, i.e., stirring a viscous thixotropic fluid will result in a
decreased viscosity
,Name the commodity packaging plastic that:
a. Does not burn (self-extinguishes).
b. Is used mostly for thermoforming.
c. Is an exceptionally high all-around gas barrier.
d. Is strongest and stiffest.
e. Has the lowest melting point.
f. Has the highest melting point.
g. Is used most often for closures.
h. Is used most often for detergent and oil bottles.
i. Forms the best "live hinge."
j. Is used for thermoformed film when packaging luncheon meat.
k. Is lowest in cost.
I. Is made into soda bottles.
m. Is an exceptionally high oxygen barrier but is water soluble.
n. Is an exceptionally high oxygen barrier.
o. Is used for most hot-filled bottles.
p. Would be used to make a squeezable bottle.
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a. PVC.
b. PVC.
c. PVDC.
d. PC.
e. LDPE/LLDPE.
f. PC.
g. PP.
h. HDPE.
i. PP.
j. PA (unoriented nylon 6).
k. PE.
I. PET.
m. PVAL.
n. PVDC.
o. PP.
p. LDPE.
,Name the six ways of extending the natural shelf life of foods. For each method,
briefly note the mechanisms by which the keeping quality of a food product is
increased.
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Reduce temperature-(freezing) slow chemical activity and reduce/stop
biological activity.
Thermal processing-(hot fill, sterile, sealed cans) control microorganisms.
Water reduction-(drying) manages moisture content to control
microorganisms.
Chemical preservation-(acids, carbon dioxide, curing/smoking,
antioxidants).
Modified atmosphere packaging-(vacuum packaging).
Irradiation-(ionization).
How long have paper making and box making been around?
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Papermaking has existed for centuries. Paper box making has existed for a
little more than 100 years.
List the most widely accepted definition of sustainability.
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, Sustainable development is development that meets the needs of the
present without compromising the ability of future generations to meet
their own needs.
What are Tg and Tm? Describe the difference in transition temperature patterns (Tg
and Tm) for amorphous and crystalline polymers.
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Tg is the glass transition temperature at which a polymeric material
changes from a rigid solid state to a soft, rubbery or elastic state. Tmis the
melt transition point where the plastic enters a melt phase. Amorphous
polymers tend to have a more prominent transition at Tg while crystalline
polymers have a more prominent transition at Tm.
What are a blanket cylinder, an anilox roll and an impression cylinder?
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A blanket cylinder accepts ink from the plates and transfers it to the
substrate (lithography).
An anilox roll accepts ink and transfers it to the printing plate
(flexography).
An impression cylinder puts pressure on the backside of a substrate so ink
can be transferred from the blanket or plate cylinder (lithography,
flexography and
gravure).
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