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GRC 329 MIDTERM
midterm
191
Other
Undergraduate 3
10/25/2009

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Term
web advantages
Definition
continuous image, speed, inline finishing, cheaper substrates, lower basis wt (tissue), press sheet utilization, perfecting
Term
web disadvantages
Definition
substrate cant be too thick, single pass through press, makeready time, fixed cutoffs
Term
substrates suited for web printing
Definition
you can use really thin materials like tissue paper, but you dont want the stock to be TOO thick

requires smooth substrate
Term
perfecting
Definition
printing on both sides with ONE pass through the press
Term
perfecting gravure and offset?
Definition
nope only offset
Term
web printing products
Definition
business forms, commercial print, direct mail, reatail inserts, books, mags, catalogs, directories, newspapers

packaging tag and label, products
Term
5 components of rotogravure press
Definition
cylinder, doctor blade, ink fountain, dryer, impression cylinder
Term
2 types of splicers
Definition
flying and zero speed
Term
which form of splicing causes more tension on the web?
Definition
flying splice
Term
why is it best to splice without stopping?
Definition
because the print balance gets interrupted when you stop the press
Term
ways to pre-condition the press...
Definition
heat, stretch, decurl, web cleaning, tension control
Term
when is tension cut off?
Definition
when it changed from roll to sheet
Term
tension points?
Definition
printing units, folder, dryers, dancer roller
Term
what helps bring tension down?
Definition
chill rollers
Term
infeed
Definition
everything before the first printing unit
Term
web break detector
Definition
shuts down the press when the web breaks.....may contain a web severer
Term
3 types of web break detectors...
Definition
1. roller
2. photocell( camera looks for web by flashing a light)
3. pneumatic (blows air)
Term
what is lateral registration registered to?
Definition
black plate
Term
closed loop color
Definition
the press automatically adjusts the inkfeed
Term
registration is controlled at four spots....
Definition
1. print unit to print unit (lateral)
2.print unit to print unit (circumfrential)
3.web to folder (side lay
4. web to folder (print to cut)
Term
lateral registration
Definition
checks registration across the cylinder
Term
circumfrential registration
Definition
checks registration around the cylinder
Term
side lay
Definition
alignment of the web from left to right
Term
print to cut
Definition
alignment of the web from when it is print until it is sheeted....gaged by the compensator
Term
what color doesnt have circumfrential registration?
Definition
cyan unit 2-13
Term
3 ways to deliver paper
Definition
sheeted, folded sigs, roll
Term
anode v cathode
Definition
anode (+) annoyed to give away electrons; steel
cathode (-) happy to recieve electrons; copper
Term
chrome and copper thickness
Definition
chrome=hair-like
copper= penny-like
Term
what gets engraved and what metal is the outside shell
Definition
cooper gets engraved and chrome is outside shell
Term
difference between electromagnetic engraving and laser engraving
Definition
electro everything must be screen but with laser it deosnt and with laser it is 4x faster and it can have diff shaped cells
Term
high key v low key
Definition
high key=highlights and low key is shadows
Term
design considerations
Definition
serrated edges, wider density range than offset, excellent for shadows
Term
be careful with....
Definition
color separtations, reverse or small type, and making mistakes cost big mula
Term
gravure products
Definition
publications, packaging, products, engraving/intagloi(money)
Term
does gravure dry or wet trap
Definition
dry trap, dry ink to dry ink
Term
zahn (efflux) cup
Definition
measure ink viscosity
Term
ucr vs gcr
Definition
both are grat component replacements but ...
UCR only does SHADOWS
and GRC does the entire photo
Term
4 cylinder types
Definition
integral shaft, hollow, sleeve, ballard shell
Term
integral shaft
Definition
fused together
Term
hollow cylinder
Definition
doesnt have a shaft
Term
sleeve
Definition
encases the outside of the cylinder
Term
ballard shell
Definition
copper coating then nickel then copper and chrome coating that goes over a hollow or integral shaft to help peel entire image layer off as a whole
Term
static v dynamic balance
Definition
static is like balance of wheels of a car and dynamic is adjusting the weight at speeds
Term
electrostatic assist
Definition
put voltage in impression cylinder to assist the ink t come out of theHIGHLIGHT cell
Term
gravure is good for low or high key?
Definition
low key
Term
new research involves engraving with.....
Definition
hybrid polymer coatings
Term
total indicated runout
Definition
the diameter of the cylinder should be even from side to side
Term
vickers
Definition
what you use to check for proper hardness
Term
to remove the previous image do you polish or grind?
Definition
grind
Term
lamella
Definition
reduced thickness blade
Term
backer blade is ....
Definition
the back up blade, provides stiffness to assembly and reduces excessive pressure
Term
doctor blade should contact the cylinder at what angle
Definition
60 degrees
Term
gravure printing variables (4)
Definition
viscosity, speed, dr blade angle, pressure
Term
gravure cylinders are measured in...
Definition
microns
Term
faradays law
Definition
the amount of current is diretly proportional to the amount of anode(metal) that is transfered to the cathode
Term
drive shaft v. servo-motor
Definition
drive shaft is traditional and has gear systems...

servo-motor is shaftless and there are individual motors at all drive points....this is better for tension control but more complex
Term
parts of the press
Definition
infeed, printing units, delivery, drying criteria, and the drive shaft/servo motors
Term
what metals is electroplating needed for?
Definition
nickel copper and chrome
Term
factors that influence (slow/speed) the electroplating process
Definition
immersion of cylinder, anode/cathode distance, temperature of the electrolyte, cleanliness of the cylinder, voltage, temp of the solution
Term
why is cleaning the cylinder important for electroplating?
Definition
because the metal will adhere to the grease or the dust adn make it not be as strong of a connection
Term
TVI
Definition
dot gain
Term
cell angles...
Definition
compressed 30 degrees
elongated 60 degrees
normal 45 degrees
Term
waht do screen angles help with
Definition
no moire
Term
you get an elongated or compressed cell when.....
Definition
elongated when cylinder spins faster and compressed when cylinder spinds slower
Term
is chrome or copper harder?
Definition
chrome is 6 times harder than copper
Term
copper is electroplated in two steps..
Definition
1. nickel flashed (quick coating) base -for release
2. copper plated
Term
what metal requires a pure small grain
Definition
copper
Term
if you just want to make minimal changes to the cyliner what should you do....
Definition
polishmaster
Term
polishing is used after......
Definition
lathe, proofing/corrections, engraving, chroming
Term
parts of the engraver
Definition
1. diamond stylus actually engraves
2. burr cleans up the excess
3. shoe tells where to engrave
Term
what does the shoe determine?
Definition
shadow cells
Term
what is slowest part of gravure process
Definition
DELIVERY
Term
parts of cell
Definition
cell wall, channel, full cell
Term
how are highlighted cells created compared to full cells.
Definition
different voltage
Term
which one has all the same size? laser or electromechanical
Definition
laser
Term
laser or electromechanical engraving has extremeley small and even cell walls
Definition
laser
Term
advantages/disadvantages for electromechanical
Definition
longer make ready, more waste, diameter wear
Term
advantages/ disadvantages for laser
Definition
fully automated, high speed, tighter control, ink savings
Term
advantages/disadvantages of cylinder types
Definition
hollow is shaftless so can be taken off, ballard can be pullled off, sleeve can be taken off but integral shaft is stuck on press
Term
function of doctor blade
Definition
to wipe excess ink from non printing area
Term
degreasing
Definition
degrease cylinder so that copper or nickle adheres well
Term
dechroming
Definition
put cylinder in solution to get rid of chrome layer
Term
funciton of impression cylinder
Definition
holds the voltage for the electrostatic assist, and transfers the image
Term
ink fountain function
Definition
supplies and controls how much ink is released
Term
function of dryer
Definition
controls time, turbulance, and temperature
Term
angle bar
Definition
bars on press used to change direction of web or paper
Term
basis weight
Definition
wight of 500 sheets of stock
Term
contact angle
Definition
angle that dr blade comes into contact with cylinder.....should be at 60 degrees
Term
calendared
Definition
gloss coating on substrate
Term
caliper
Definition
thickness of plate
Term
chanel
Definition
gap between cells for good ink release
Term
chrome
Definition
layer that coats the cylinder and it protects the copper from friction. prevents oxidation of the copper
Term
blade angle
Definition
the angle of the actual blade...

can have lamella tip (thinner and rounder and helps keep thickness consistent -no changes to image when it wears)
or be beveled (when wears it shows changes in the image)
Term
copper
Definition
layer around cylinder that gets engraved
Term
cut off
Definition
gravure has a fixed cut off (cuts paper at specific size)
Term
dancer
Definition
roller that helps to detect web tension (and breaks)
Term
donut
Definition
ink in gravure cell doesnt release so you get a donut in the middle
Term
electrolyte
Definition
solution that contains ions to conduct current
Term
electro mechanical engraving uses
Definition
diamond stylus
Term
electroplating
Definition
transfer of anode to cathode ...(+ to -)
Term
festoon
Definition
stores extra paper for splice
Term
gap
Definition
gravure is gapless printing.
Term
idler
Definition
helps keep tension on press..doesnt move just rolls
Term
lithography
Definition
water=non image
oil=ink

oil and water dont mix
Term
metering roller
Definition
in the tilt box....puts positive tension on the rolls
Term
nip points
Definition
point of contact
Term
packing
Definition
put behind blanket on web presses for cushion
Term
roll stand break is controlled by...
Definition
dancer
Term
tension transducer system
Definition
measures web tension
Term
soft proof
Definition
proof on screen
Term
course v. fine screen
Definition
finer screens transfer less ink, take longer to engrave, wears quickly
Term
engraving enhancements?
Definition
LASER and laser exposing
Term
laser engravers use waht type of metal?
Definition
zinc because it is non refective
Term
laser exposing
Definition
image is chemically etched
Term
laser imaging with chemical engraving uses what?
Definition
black laquer with coating-resist
Term
laser iamging with reverse eletroplating uses....
Definition
-crea
-re-collects material from cells
Term
fine line engraving
Definition
putting smaller cells in the gaps of the larger cells
Term
2 types of fine line engravers
Definition
1. extreme engraving (HELL)-uses a seperate head
2. Transcribe engraving syystem-uses SINGLE head and is software related
Term
DisCoP
Definition
Dissolvable copper plating technology
-dissovles copper in a solution
-uses and anode solution rather than copper nuggests in an anode basket
Term
Major components of gravure print unit?
Definition
1. cylinder
2 ink fountain
3 dr blade
4 imp cylinder
5. dryer
Term
Cart (trolly) systems
Definition
allows cartridge swapping, off press makeready, and you can stage the next cylinder so they press can keep running
Term
Primary roll of doctor blade
Definition
keep ink off non-image area
Term
important issues with the dr blade
Definition
blade tip, blade angle, and distance from nip
Term
set angle v. contact angle
Definition
set angle the angle it is loaded into the dr blade holder (60 degrees0

contact angle is the ange of contact witht he cylinder
Term
type of blade tips
Definition
bevel, reduced thickness, radius
Term
what deos the backer blade do?
Definition
reduces fatigue
Term
key points of blade assembly
Definition
quick, ripple free and repeatable
Term
oscillation
Definition
(movement back and forth)...it reduces ink rivers, minimizes local wear, and removes debris
Term
"Running In"
Definition
how wipe changes after wearing occurs
Term
optimum wiping angle will....
Definition
minimize cylinder wear, give cleanest printing results and allow highest speeds
Term
what material is dr blade?
Definition
steel
Term
abrasion
Definition
scrape (cant be avoided with dr blades)
Term
fatigue
Definition
metal breaks because there is too much PRESSURE on the blade (can be avoided)
Term
corrosion
Definition
water based inks cause deterioration (can be avoided)
Term
how to fix corrosion
Definition
change substrate or alter pH
Term
what material is hte impression cylinder?
Definition
rubber roller
Term
do you need a harder or softer impression cylinder for rougher substrates?
Definition
harder
Term
is the TIR for impression cylinder higher or lower than the print cylinder?
Definition
lower
Term
what is the mp. cylinder driven by?
Definition
print cylinder
Term
how much pressure do you want to use with the imp cylinder?
Definition
MINIMAL
Term
ESA is particularly helpful with what type of ink?
Definition
solvent based
Term
with ESA what gets charged?
Definition
the imp cylinder
Term
PROS and CONS of ESA
Definition
good print quality in highlights..

lower pressure

higher press speeds

reduced heat

less expensive stock

NEGATIVE=STATIC
Term
3 factors of ink drying?
Definition
time, turbulance(moving air) and temp
Term
what temp does ink catch on fire?
Definition
451 degrees
Term
what type of ink is used in FILM and PUBLICATION?
Definition
solvent
Term
what inks print on PAPERBOARD products?
Definition
water based
Term
PRO/CON of water based ink?
Definition
good ink release but doesnt adhere as well to substrate
Term
UV and EB Inks work by...
Definition
wiping the non image area.....but there are viscosity problems
Term
viscosity measure with.....
Definition
efflux cup (zahn shell iso) as a measure of seconds
Term
2 types of automatic viscometers...
Definition
ball(how faast it falls) and cylinder(how fast it spins)
Term
how many engraving heads for pub and pack
Definition
pub = multiple

pack = 1
Term
haze
Definition
(clarity) haze in non image area relatied to blade failure
Term
snowflaking/skipping
Definition
random little spots showing through midtones and highlights


-impression of rough substrate
Term
doctor blade streaks
Definition
occcur because of damage to doctor blade (nick in the blade)
Term
whiskering
Definition
fine hair like lines that whisker beyond border of the image..


occurs because of static buildup from ESA

"like kissing a paper...the ink pulls back"
Term
pinholing
Definition
failure of printed ink to form a complete film.....usually due t surface tension
Term
volcano
Definition
solvent vapors get trapped under the dry ink film
Term
Gravure Ink Sequence
Definition
K C M Y
Term
ink sequence is determined by....?
Definition
tack
Term
surface energy of ink must be higher or lower than the film?
Definition
lower
Term
how to change surface tension?
Definition
surface treatments like corona(electronic) plasma(gas) and flame(heat)
Term
properties of film and foil....
Definition
waster vapor transmission rate

oxygen transmission rate

surface energy

tensile strength

coefficient of friction

haze
Term
web offset products.
Definition
books
direct mail
newspapers
inserts
magazines
business forms
folding cartons
Term
Quad graphics is a unique company because....
Definition
they are based on culture, made a community out of a print company
Term
largest privately owned print company?
Definition
quad graphics
Term
s wrap
Definition
print 4 colors on 3 units...unit prints 2 colors on one side of web (uses DIRECT LITHO)
Term
WE (the goss) can print what size news papers?
Definition
broadsheet, tabload, magazine
Term
if goss press had a double former it could.....
Definition
do ribbons and diff sections
Term
binding v. finished
Definition
binding = attatcing finishing = everything else
Term
combo folder used for
Definition
commercial and newspapers
Term
what deos ribbons allow for?
Definition
diff page combinations in diff ways
Term
components of the combo folder.....
Definition
former board, jaw folder and quarter folder
Term
jaw folder is used for.....
Definition
TABLOID
Term
quarter fold is used for?
Definition
MAGAZINE
Term
combo folder fold...per or parralell to web?
Definition
both ways!
Term
former board folds perp and par to web
Definition
parralel to web
Term
RTF
Definition
roller top of former...slits papers and marrys all of the webs
Term
jaw folder folds with or against grain?
Definition
against
Term
steps of jaw folder
Definition
pins,cut from web, tucker blade to create protrusion, and then jaws
Term
double jaw makes what fold?
Definition
double parralell fold (2 up digest or pocket size)
Term
why preforate?
Definition
eliminates gussets
Term
2 types of preforating?
Definition
RTF perf (across the head) or the......Cross Perf (full web-magazine)
Term
ribbon folder occurs....
Definition
before FORMER
Term
what directs the ribbons?
Definition
angle bar directs ribons to jaw folder
Term
double former allows for what?
Definition
a 2nd fold
Term
does double former produce long or short grain sigs?
Definition
long grain
Term
"collect"
Definition
folded married sigs that THEN come together and get marries
Term
collect is used with....
Definition
"2 around"
Term
specifications promote.....(2 things)
Definition
quality an uniformity
Term
quality is mainly measured by....
Definition
REPEATABILITY
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