PKSC 4300 Actual EXAM Questions And
CORRECT Answers
what are the safety measures that would be recommended for setting up a roto printing press for the
next job: hanging rolls, cutting webs, webbing the substrate through the machine, placing trolleys
into the machine, setting doctor blades (sharp) and putting solvent-based ink into the pumping
system, no real risk of stuff dropping from overhead - CORRECT ANSWERS safety shoes, safety
glasses, static control systems to prevent sparking, fire suppression system, hoist or crane system to
lift parts, appropriate knife safety
what are the appropriate tests that might be run in the development, manufacture, & use of the
pouch used for nacho cheese tortilla chips: pouch is filled and heat sealed on a VFFS line, the
structure is OPP/ink/white LDPE extrusion/metallized OPP sealant - CORRECT ANSWERS basis
weight of extrusion, COF, pouch burst pressure, heat seal test, hot tack strength, tape adhesion test
of ink
what two things do all liquid coating systems do? - CORRECT ANSWERS 1. apply coating to
substrate
2. meter excess coating off substrate
Machine includes which of the following - CORRECT ANSWERS extruder, gravure coater,
adhesive laminating station, multiple unwinds, dryer
What is the minimum number of tension zones that this machine should have? - CORRECT
ANSWERS 6
what would you expect to need to measure green tack for this lamination? If so, would you expect
green tack off of such a machine to be strong or weak? - CORRECT ANSWERS yes because you
have multiple laminations. I would expect it to be strong because it is a solvent laminator and an
extrusion coater, both have strong bonds initially
which of the following would be true of such a machine - CORRECT ANSWERS probable costs
more than either a stand-alone 1 ply adhesive laminator or a stand-alone 2 ply extrusion laminator,
probably cheaper than buying both 2 ply adhesive & 2ply extrusion laminator, probably save me
personnel & time cost over making a 2-pass lamination, if i had 2 machine & one broke, i could run
the other, if the dryer blowers break, i could still extrusion laminate on this line, might give me a cost
advantage if i need to make PET/Adh/foil/ext/LLDPE, might give me a cost disadvantage if i need to
make PET/solvent adh/LLDPE, might give me a cost disadvantage is i need to make PET/ext/LLDPE
, For a coating to adhere to a substrate, wetting must occur; what is true about coating & substrate
wetting & adhesion - CORRECT ANSWERS key parameter for the solid is its critical surface
tension, to wet liquid coatings must have lower surface tension that a substrates critical surface
tension, more is needed that just wetting to adhere, we can find a solid's critical surface tension
using dyne solutions, we can measure adhesion using a tape test
which of the following are qualities of a good flexible packaging specification - CORRECT
ANSWERS based upon real needs, achievable in the real world, based upon statistical analysis
of real data wherever possible, include input from machine maker and material maker, based upon
negotiated agreed-upon needs
which of the following are true of vacuum coating businesses - CORRECT ANSWERS typically a
batch process, lot of down time, prefer large OD rolls, prefer thin webs, prefer to use full machine
width
which of the following are true of printing of flexible packaging - CORRECT ANSWERS used to
assist in the communication function of packaging, primary methods for flexible packaging are flexo
and gravure, meters and applies like other coating systems, but applies selectively, can build more
colors using process but sometimes prefer line (spot) printing
if Cp=1 and Cpk<1, what can we say about the relative widths of the spec and process? - CORRECT
ANSWERS Process width is equal to spec width
if Cp=1 and Cpk<1 - CORRECT ANSWERS spec and process have a different center
Flexo printing - CORRECT ANSWERS ink feed from sump, doctor blades, ink return to sump
this doctor blade system was drawn and described in class, what type of doctor blade system is it -
CORRECT ANSWERS manifold or chambered
what benefits does this system (flexo) offer over older systems of the same type of print - CORRECT
ANSWERS allows for faster lamination, lower emission of solvents into plant air, less premature
drying in due to enclosed system, more precise print than fountain roll system due to doctor blades,
more precise print due to less total rollers seen by ink. cleanups easier than fountain roller systems
CORRECT Answers
what are the safety measures that would be recommended for setting up a roto printing press for the
next job: hanging rolls, cutting webs, webbing the substrate through the machine, placing trolleys
into the machine, setting doctor blades (sharp) and putting solvent-based ink into the pumping
system, no real risk of stuff dropping from overhead - CORRECT ANSWERS safety shoes, safety
glasses, static control systems to prevent sparking, fire suppression system, hoist or crane system to
lift parts, appropriate knife safety
what are the appropriate tests that might be run in the development, manufacture, & use of the
pouch used for nacho cheese tortilla chips: pouch is filled and heat sealed on a VFFS line, the
structure is OPP/ink/white LDPE extrusion/metallized OPP sealant - CORRECT ANSWERS basis
weight of extrusion, COF, pouch burst pressure, heat seal test, hot tack strength, tape adhesion test
of ink
what two things do all liquid coating systems do? - CORRECT ANSWERS 1. apply coating to
substrate
2. meter excess coating off substrate
Machine includes which of the following - CORRECT ANSWERS extruder, gravure coater,
adhesive laminating station, multiple unwinds, dryer
What is the minimum number of tension zones that this machine should have? - CORRECT
ANSWERS 6
what would you expect to need to measure green tack for this lamination? If so, would you expect
green tack off of such a machine to be strong or weak? - CORRECT ANSWERS yes because you
have multiple laminations. I would expect it to be strong because it is a solvent laminator and an
extrusion coater, both have strong bonds initially
which of the following would be true of such a machine - CORRECT ANSWERS probable costs
more than either a stand-alone 1 ply adhesive laminator or a stand-alone 2 ply extrusion laminator,
probably cheaper than buying both 2 ply adhesive & 2ply extrusion laminator, probably save me
personnel & time cost over making a 2-pass lamination, if i had 2 machine & one broke, i could run
the other, if the dryer blowers break, i could still extrusion laminate on this line, might give me a cost
advantage if i need to make PET/Adh/foil/ext/LLDPE, might give me a cost disadvantage if i need to
make PET/solvent adh/LLDPE, might give me a cost disadvantage is i need to make PET/ext/LLDPE
, For a coating to adhere to a substrate, wetting must occur; what is true about coating & substrate
wetting & adhesion - CORRECT ANSWERS key parameter for the solid is its critical surface
tension, to wet liquid coatings must have lower surface tension that a substrates critical surface
tension, more is needed that just wetting to adhere, we can find a solid's critical surface tension
using dyne solutions, we can measure adhesion using a tape test
which of the following are qualities of a good flexible packaging specification - CORRECT
ANSWERS based upon real needs, achievable in the real world, based upon statistical analysis
of real data wherever possible, include input from machine maker and material maker, based upon
negotiated agreed-upon needs
which of the following are true of vacuum coating businesses - CORRECT ANSWERS typically a
batch process, lot of down time, prefer large OD rolls, prefer thin webs, prefer to use full machine
width
which of the following are true of printing of flexible packaging - CORRECT ANSWERS used to
assist in the communication function of packaging, primary methods for flexible packaging are flexo
and gravure, meters and applies like other coating systems, but applies selectively, can build more
colors using process but sometimes prefer line (spot) printing
if Cp=1 and Cpk<1, what can we say about the relative widths of the spec and process? - CORRECT
ANSWERS Process width is equal to spec width
if Cp=1 and Cpk<1 - CORRECT ANSWERS spec and process have a different center
Flexo printing - CORRECT ANSWERS ink feed from sump, doctor blades, ink return to sump
this doctor blade system was drawn and described in class, what type of doctor blade system is it -
CORRECT ANSWERS manifold or chambered
what benefits does this system (flexo) offer over older systems of the same type of print - CORRECT
ANSWERS allows for faster lamination, lower emission of solvents into plant air, less premature
drying in due to enclosed system, more precise print than fountain roll system due to doctor blades,
more precise print due to less total rollers seen by ink. cleanups easier than fountain roller systems
