Gra534 Final Exam

Front 1

Flexography was originally called ___________ .

Back 1

Aniline printing

Front 2

When was aniline printing called flexography? And by who?

Back 2

October 21, 1952 by the Printing Institute

Front 3

What does FIRST stand for?

Back 3

Flexographic Image Reproduction Specifications & Tolerances

Front 4

When was FIRST published?

Back 4

1997

Front 5

How are molded plates made?

Back 5

Made by pouring liquid gum into a mold/matrix

Front 6

True or False

Photopolymer plates have the image area washed away by water or solvent based solution.

Back 6

False

nonimage area is washed away

Front 7

Photopolymer plates use negative _____ or ______ to harden image areas.

Back 7

negative film or lasers

Front 8

Distortion is most noticeable with small _________ plate cylinders.

Back 8

small diameter

Front 9

What is used to mount plates to the plate cylinder?

Back 9

stickyback or double sided tape

Front 10

True or False

Mounting the plate off-press saves make ready time.

Back 10

True

Front 11

Repeat length is determined by __________ _______________ ______________ .

Back 11

plate cylinder diameter

Front 12

What are the 3 types of flexo inks?

Back 12

solvent based, water based and UV curable

Front 13

Flexo ink colours are available in opaque, ____________ and fluorescents.

Back 13

metallic

Front 14

True or False

Flexo presses can not be combined with litho presses.

Back 14

False

Flexo presses can be combined with litho presses for spot coating applications.

Front 15

Sheetfed Corrugated presses are good for ______ format prints.

Back 15

wide

Front 16

Name the 3 presses available for wide web printing.

Back 16

Stack press, CI press, IL press

Front 17

What are the 4 major sections of a flexo press?

Back 17

infeed, printing section, dryer, rewind

Front 18

Stack presses are commonly used for _________ coating.

Back 18

flood coating

Front 19

Name 4 advantages to using Stack presses.

Back 19

- permits full width perfecting

- faster make ready

- large repeat length

- smaller footprint

Front 20

True or False

Thin substrates are subjected to stretching under tension when using the Stack press.

Back 20

True

Front 21

On a Central Impression press, it is most common to use a ___ (#) colour configuration.

Back 21

6

Front 22

Which flexo press is temperature controlled?

Back 22

Central Impression press

Front 23

On the CI press, the drums range from ____ to ____ inches in diameter.

Back 23

89 - 94"

Front 24

True or False

It is easy to fix items on a CI press.

Back 24

False

CI presses are compact and it's hard to reach items to fix.

Front 25

What is double ending?

Back 25

feeding the end of the web to print on the reverse side

Front 26

CI presses have superior print ___________ .

Back 26

register

Front 27

Robotic cylinder loading improves ___________ and reduces ___________ .

Back 27

improves safety and reduces damages

Front 28

Name 2 disadvantages to using a IL press.

Back 28

- large floor footprint

- register inferior to CI presses

Front 29

Name the 4 types of flexo presses available for narrow web printing.

Back 29

CI press, IL press, Stack press, Platform press

Front 30

What is the most common application for arrow web printing?

Back 30

pressure-sensitive adhesive labels

Front 31

Narrow web presses have a web width from ____ to ____ inches.

Back 31

6 - 20"

Front 32

What is gear train?

Back 32

When gears are used to drive impression cylinder, plate cylinder and anilox roll to the same surface speed.

Front 33

What are the 3 ink metering methods?

Back 33

Fountain Roll Doctoring

Reverse Angle Doctor Blade

Chambered Doctor Blade

Front 34

During the Fountain Roll Doctoring ink metering system, a wiping action occurs when the fountain roll turns at a ___________ speed than the anilox roll.

Back 34

slower speed

Front 35

True or False

The Fountain Roll Doctoring ink metering method uses a doctor blade.

Back 35

False

Front 36

True or False

The Reverse Angle Doctor Blade ink metering method uses a rubber fountain roll with a metering nip and anilox roll.

Back 36

False

no metering nip

Front 37

The Chambered Doctor Blade ink metering method has the chamber edges sealed with _________ .

Back 37

plastic

Front 38

Open fountain systems may have a cover to reduce evaporation of _________ and ___________ .

Back 38

amines and solvents

Front 39

________ within the inking system causes heat and undesired ink drying.

Back 39

Friction

Front 40

________ anilox rolls allow printer to test different anilox counts.

Back 40

Banded

Front 41

What does 0/45 geometry mean?

Back 41

A light is shone at a 0 degree angle and its reflection is measured at 45 degree angle

Front 42

Anilox rolls are made with __________ ________ or ___________ .

Back 42

chromed steel or ceramic

Front 43

Anilox rolls controls ink film thickness. What printability issues are cause by having too thin ink film thickness?

Back 43

low density

weak colour

Front 44

Anilox rolls controls ink film thickness. What issues arise when the ink film thickness is too thick?

Back 44

high density

dark colour

slow drying

blocking

poor ink trap

Front 45

Mechanically engraved anilox rolls are ________ plated for corrosion resistance.

Back 45

nickel plated

Front 46

Ceramic coated anilox rolls permit a doctor blade system but limits anilox count to ____ lpi.

Back 46

220lpi

Front 47

Laser engraved permits fine anilox counts up to ______ to ______ lpi.

Back 47

1200 to 1500 lpi

Front 48

True or False

Cell angles of 45 degrees is common for flexo newspaper printing.

Back 48

True

Front 49

What cell angle results in the best quality print?

Back 49

60 degree angle

Front 50

30 degree cell angle is common for what print application?

Back 50

coated application

Front 51

What cell shape is most common?

Back 51

hexagon

Front 52

What is the formula for Specific Volume?

Back 52

Specific Volume = Cell Volume x Anilox Count^2

Front 53

Anilox roll volume must be monitored to prevent ________ diminishing.

Back 53

depth

Front 54

What cell volume measuring method uses light reflection?

Back 54

Vertical Scanning Interferometry

Front 55

Explain the process of the most common cell volume measuring method.

Back 55

- apply known volume of ink

- manually spread thin layer with handheld doctor blade

- make impression

Front 56

True or False

Anilox rolls should be cleaned weekly.

Back 56

False

should be cleaned daily

Front 57

True or False

A pressure washing device is used to decontaminate an anilox roll.

Back 57

True

Front 58

The finer the anilox ruling, the _______ the required depth of opening.

Back 58

smaller

Front 59

The coarse plate screen ruling for halftones can be calculated as ________ (what is the formula)

Back 59

4 x plate screen ruling

Front 60

What is dot dunking?

Back 60

When the halftone on plate is small enough to plunge into the anilox cell.

Front 61

Temperature sensitive and reactive best before dates are examples of __________ packaging.

Back 61

intelligent

Front 62

What are the 7 types of flexo substrates?

Back 62

1) paper and paperboard

2) corrugated

3) laminates

4) foils

5) films

6) glass

7) metal

Front 63

What does BOPP stand for?

Back 63

Biaxially Oriented Polypropylene

Front 64

What are the 4 types of PE?

Back 64

1) HDPE

2) LDPE

3) m-LLDPE

4) LLDPE

Front 65

What was the first commercially manufactured PE type?

Back 65

LDPE

Front 66

What type of film is known as PET?

Back 66

polyester

Front 67

What type pf film is known as PE?

Back 67

polyethyline

Front 68

What are the 3 layers on laminates?

Back 68

facestock, adhesive, release liner

Front 69

The difference between laminates and films are that film has no _______ and _______ ________ .

Back 69

no adhesive and release liner

Front 70

Pet food and sugar bags are examples of _______ bags.

Back 70

multiwall bags

Front 71

Made with piles, paperboard can be described to have a _______ or more caliper.

Back 71

0.012" + caliper

Front 72

The bond between __________ and ________ determine the board strength of corrugated substrates.

Back 72

liner and flutes

Front 73

Name 2 reasons why corrugated substrate is popular.

Back 73

cost effective and high strength to weight ratio

Front 74

For facestocks, calendared vinyl and cast vinyl are both made from what common material?

Back 74

PVC

Front 75

True or False

Topcoated vinyl allows thin ink film on PVC laminates.

Back 75

True

Front 76

When PVC laminates have a low surface tension, it could cause ink __________.

Back 76

ink beading

Front 77

True or False

PET laminates have high strength in only grain long direction.

Back 77

False

strong in both directions

Front 78

PS laminates are ________ sensitive and poor ______ resistance.

Back 78

solvent sensitive and poor heat resistance

Front 79

What laminate is known as PS?

Back 79

Polystryene

Front 80

What laminate is known as PP?

Back 80

Polypropylene

Front 81

True or False

Polystrene is common for outdoor use.

Back 81

False

not for outdoor use

Front 82

Which laminate would you recommend for an outdoor sign that won't be changed for 5 years?

Back 82

PVC

Front 83

PS laminates requires surface treatment after _______ based ink is used.

Back 83

water

Front 84

PP laminates have excellent optical clarity and ________ resistance.

Back 84

solvent

Front 85

Laminate adhesives are measured for _________ , ________ and __________ properties.

Back 85

tack, peel and shear

Front 86

Considering foil substrates, where is the metal layer applied?

Back 86

in the middle when foil is laminated to film

Front 87

Name the ink characteristics that affect runability.

Back 87

Rheology

Transfer

Front 88

Colour Strength depends on __________ type , __________ and _____ _____ __________

Back 88

pigment type, concentration and ink film thickness

Front 89

Which ink characteristic does the Scotch Tape Test for?

Back 89

Adhesion

Front 90

What are the 4 parts in ink formulation?

Back 90

solvents, resins, colourant, additives

Front 91

What is lightfastness?

Back 91

how quickly pigments fade

Front 92

What process colour has the worst lightfastness?

Back 92

yellow, however magenta is easier to see

Front 93

Water based inks need a surface tension of _____ or more to apply ink.

Back 93

30+

Front 94

True or False

Solvents are made to carry resins and pigments but evaporate after printing.

Back 94

True

Front 95

Energy curable inks have good ________ and low _________ _______

Back 95

good printability and low energy costs

Front 96

Name 5 objectives of FIRST.

Back 96

- outline flexographic procedures and guidelines

- improve quality and consistency

- reduce cycle time and rework

- control production costs through streamlined materials

- grow flexo printing industry

Front 97

True or False

It is the customers responsibility to determine if a job is achievable.

Back 97

False

printer's responsibility

Front 98

What are the 6 FIRST methodologies?

Back 98

1) Optimization

2) Press fingerprinting

3) Process control

4) Characterization

5) Process improvements

6) Print evaluation

Front 99

Which FIRST methodology documents the press condition and the resulting quality?

Back 99

Press Fingerprinting

Front 100

What are the 3 tolerance methods when evaluating print?

Back 100

DE cmc, DE 94 or DE 2000

Front 101

Name 2 disadvantages to having a web press.

Back 101

long make ready

more makeready waste

Front 102

A full web offset press would have a web width of _____" with a ___-___cut off length.

Back 102

38" web width

22-25" cut off length

Front 103

A double web offset press would have a web width of _____" with a ___-___cut off length.

Back 103

76" web width

44-50" cut off length

Front 104

Heatset Simulator

What is this symbol?

Back 104

emergency stop button

Front 105

Heatset Simulator

What is this symbol?

Back 105

run press???

Front 106

Heatset Simulator

What is this symbol?

Back 106

control console

Front 107

Heatset Simulator

What is this symbol?

Back 107

press

Front 108

Flexo Simulator

What is this symbol?

Back 108

turn bar or power

Front 109

Flexo Simulator

What is this symbol?

Back 109

emergency stop button

Front 110

Flexo Simulator

What are these symbols?

Back 110

Log

Help

Copy Desk

Front 111

Flexo Simulator

What are these symbols?

Back 111

Stop, Jog, Idle, Run

Front 112

Heatset Simulator

What is this symbol?

Back 112

master water

Front 113

What are the 3 web offset press configurations?

Back 113

inline

blanket to blanket

satelite

Front 114

In regards to tensile strength an ideal paper can take a ________ load and shows _______ elongation.

Back 114

high load

little elongation

Front 115

True or False

As ink viscosity decreases, dot gain decreases.

Back 115

False

As ink viscosity increases, dot gain decreases.

Front 116

The printing pressure on a flexo press is also known as _______ ___________ .

Back 116

kiss impression

Front 117

What are the 2 main influsences of tensile strength of paper?

Back 117

grain direction

length of fibre

Front 118

An anilox roller with a higher BCM results in ________ ink film and more _______ colour.

Back 118

thicker ink film

more intense colour

Front 119

Why did the tack of heatset offset inks rise in the inkometer test?

Back 119

evaporation of mineral oil solvents

Front 120

What does a steep slope in an ink tack curve tell you?

Back 120

a steep slope means the tack increased quickly

Front 121

What is the tack of flexo ink?

Back 121

zero tack

inks are made from liquid

Front 122

To improve ink wettability on plastic substrates, they must be top _______ or undergo the _______ treatment.

Back 122

top coated

corona treatment

Front 123

Slur print defect occurs when the ________ _______ of the plate and impression cylinder are not the same.

Back 123

Surface speed

Front 124

What does the converter in packaging industry do?

Back 124

forms the printed product to its final form

Front 125

What is the common web offset press used today?

Back 125

blanket to blanket

Front 126

Name the 2 benefits of having a gapless blanket.

Back 126

increased printing area

reduced waste

Front 127

The inline web offset press is also known as ________ _____ press

Back 127

business form press

Front 128

What is a printing couple?

Back 128

plate and blanket

Front 129

True or False

In flexography, the distortion of halftone dots, shapes, line widths, and typeforms is more noticeable with small diameter plate cylinders than with larger diameter plate cylinders.

Back 129

True

Front 130

Which type of flexographic ink colorant does not dissolve in the ink vehicle?

Back 130

pigments

Front 131

What device allows proofing of flexo plates to be done off-press?

Back 131

sleeves

Front 132

How is ink density controlled in a flexo printing unit?

Back 132

Diluting the ink

Changing the anilox roll BCM

Front 133

What is the typical range of line ruling for anilox rolls?

Back 133

80 - 1200 lpi

Front 134

Which type of product has the largest market for flexography?

Back 134

Corrugated Cardboard

Front 135

The first modern anline press, from 1890, resembled what flexo press configuration?

Back 135

Central Impression

Front 136

Which type of flexographic inks does not have any volatile dilutents, such as alcohol or amines?

Back 136

UV inks

Front 137

Flexo presses with widths in the range of 20 to 47 are called __________ presses

Back 137

mid web press

Front 138

Which flexo press configuration has the poorest registration due to stretching of the substrate?

Back 138

stack

Front 139

On a CI flexo press, the CI drum is temperature controlled for what reasons?

Back 139

Improve register

Control expansion of the CI drum

Control temperature of the substrate

Front 140

True or False

The Corrugated Sheetfed Press is considered a wide-web press.

Back 140

True

Front 141

Which flexo press configuration requires double-ending in order to permit perfecting?

Back 141

CI

Front 142

The ______ press is widely used for overall continuous coating or printing of a substrate (flood coating).

Back 142

Stack

Front 143

More than 75% of narrow-web flexo presses are of what configuration?

Back 143

inline presses

Front 144

What is the most common application for narrow-web presses?

Back 144

Pressure-sensitive adhesive labels

Front 145

True or False

Robotic cylinder loaders for CI presses are normally built in to the press.

Back 145

True

Front 146

True or False

With the Fountain Roll Doctoring method, the fountain roll should be made of soft rubber to ensure that the anilox cells completely fill with ink.

Back 146

False

Front 147

With the Two-Roll Metering method, the speed of the fountain roll should not turn _________ the speed of the anilox roller.

Back 147

faster than

Front 148

What doctoring methods may be permitted by the same inking system?

Back 148

Fountain Roll Doctoring

Reverse Angle Doctor Blade

Front 149

Which anilox roll engraving method is the most uncommon?

Back 149

Chemical Etch

Front 150

If mechanically engraved anilox rolls are not coated with ceramic, which metering method are they only suitable for?

Back 150

Fountain Roll Doctoring

Front 151

What type of coating limits some mechanically engraved anilox rolls to a 220 lpi maximum?

Back 151

Ceramic coating

Front 152

Which type of inks are easier to clean from anilox roll cells?

Back 152

Solvent-based inks

Front 153

The reverse angle doctor blade should make contact with the surface of the anilox roll at an angle of ______ degrees, with a tolerance of +/-2 degrees.

Back 153

30

Front 154

What is the Anilox Roll Volume of an anilox roll with a 220 lpi cell count and a cell volume of 112,000 cubic microns?

Back 154

5.4 BCM

Front 155

What is the most common in-plant method to test cell volume of an anilox roll uses what type of ink applied to the anilox surface?

Back 155

Liquid inkjet ink

Front 156

True or False

A 1,200 lpi anilox roll would normally have a smaller depth-to opening ratio than a 660 lpi anilox roll.

Back 156

True

Front 157

True or False

A 1,200 lpi anilox roll would have a smaller anilox roll volume (BCM) than a 660 lpi anilox roll.

Back 157

True

Front 158

According to the equation method, a plate with a 65 lpi screen ruling can be used with an anilox roller that has a minimum ___ lpi screen ruling.

Back 158

260 lpi

Front 159

What percentage does consumer goods packaging make up of the total packaging market?

Back 159

70%

Front 160

Which of the below is NOT an example of intelligent packaging?

Back 160

Product Name

Front 161

In general, the most widely used packaging substrate is ________ and _______________

Back 161

paper and paperboard

Front 162

The liner of corrugated board is made from fourdriniers with _____ headboxes.

Back 162

2

Front 163

True or False

The paper or synthetic backing of laminate adhesives is called release backing.

Back 163

False

Front 164

True or False

Polyester tends to expand and shrink with dryer heat

Back 164

True

Front 165

Cost-effective, high strength-to-weight ratio, and used for packaging of heavy goods describes what substrate?

Back 165

Corrugated board

Front 166

Plasticizers, surfactants, and defoamers are examples of what ingredient in flexo ink formulation?

Back 166

Additives

Front 167

True or False

The difference between dyes and pigments in solvent-based inks is that pigments dissolve in the vehicle whereas dyes stay as solid particles.

Back 167

False

Front 168

The largest component of flexo inks is what?

Back 168

solvents

Front 169

Heat resistance (lamination), resistance to fats, oils, detergents, etc. are examples of _________ properties/characteristics.

Back 169

functional

Front 170

Air emissions, metal content, and toxicity are examples of ______ properties/characteristics.

Back 170

regulatory requirements

Front 171

What ingredient of flexo inks makes up about 4%-20% of its composition?

Back 171

colourant

Front 172

Water has a surface tension of ____ dynes/cm.

Back 172

72

Front 173

For proper wettability, a water-based flexo ink must have a surface tension which is _______ the surface tension of the substrate.

Back 173

less than

Front 174

Good printability, low energy costs, and low/no VOC emission are characteristics of which type of ink?

Back 174

energy-curable

Front 175

True or False

Dyes can range from transparent to highly opaque.

Back 175

False

Front 176

Fan-out usually occurs when web picks up _______ from printing units and expends with across grain.

Back 176

moisture

Front 177

The process of perfecting on a satellite web press where both sides of the web pass through the same printing unit(s) is called _________

Back 177

doubling ending

Front 178

What two factors determine the signature size of a web press, when the signature is opened flat?

Back 178

Width of the cylinders

Cutoff

Front 179

What term defines a press that uses independent motors controlled via fiber optic links to a central controller?

Back 179

Shaftless press

Front 180

Which web offset press configuration(s) requires an S-wrap to print two colours on one side of the web, using a single printing unit?

Back 180

Blanket-to-blanket

Front 181

True or False

The dryer of a heatset web press is the most important component in curing the ink printed on the web.

Back 181

False

Front 182

How many units does a blanket-to-blanket press require to print 4-colours on both sides of the web?

Back 182

4

Front 183

The first gapless blanket press was called the _____________________________

Back 183

Heidelberg Harris Sunday press

Front 184

True or False

Gapless blanket presses do not use bearer contact.

Back 184

True

Front 185

Assuming the plate cylinder and blanket cylinder are the same diameter, the blanket circumference is normally the same measurement as the ____________________.

Back 185

web cutoff

Front 186

How should blankets be stored?

Back 186

flat, face to face

Front 187

Which of the following is caused by excessive plate/blanket squeeze?

Back 187

dot gain

Front 188

True or False

When placing packing on a plate cylinder, the packing covers the cylinder gap.

Back 188

False

Front 189

True or False

When the plate gap is centered in the blanket gap, unwanted ink and water on the plate edges wont transfer to the blanket.

Back 189

True

Front 190

The total thickness of the plate, blanket, and packing sheets on both cylinders determines the amount of ________ between the plate and blanket

Back 190

squeeze

Front 191

What is the proper combination of three infeed metering rollers on a web press?

Back 191

2 driven steel rollers; 1 non-driven rubber roller.

Front 192

The strongest, most positive control of the web occurs at which nip point?

Back 192

printing units

Front 193

On a box-tilt device, which rollers are fixed, and which rollers are movable?

Back 193

1 and 4 are fixed; 2 and 3 are movable.

Front 194

True or False

To control cutoff, the compensator roller is set to create a fixed distance between the chill rolls and the folder.

Back 194

False

Front 195

What is the most common type of web break detector?

Back 195

Optical

Front 196

The term "fan-out" best describes RPW. What does RPW stand for?

Back 196

Relative Printing Width

Front 197

Bustle wheels are used to bring the edges of the web __________ together.

Back 197

closer

Front 198

On a Flying Paster splicing system, what actions occur when the first butt switch (8 in.) is activated?

Back 198

The acceleration belt drops on the new roll

The next roll rotates into splicing position

The splicing arm presses against the surface of the expiring roll

Front 199

Which splicing method requires the lead edge of the new roll to be held by a splicing roll, close to the expiring roll but not touching, just before the splice is made?

Back 199

The Zero-Speed Method

Front 200

When printing with quickset inks, the rigidity most rapidly increases during ___________

Back 200

absorption

Front 201

When printing with heatset inks, rigidity most rapidly increases at the _____ ________ .

Back 201

chill rolls

Front 202

Catalytic oxidizers heat the exhaust from a heatset dryer to ________ - _______ºF

Back 202

600-800ºF

Front 203

Thermal oxidizers heat the exhaust to _______-_____ºF

Back 203

1400-1500ºF

Front 204

Chill roll tacking increases the attraction of the web to the chill rolls using ___________ force

Back 204

electrostatic force.

Front 205

Chill roll overspeed should typically be set to ___-___%

Back 205

1-2%

Front 206

True or False

News inks dry by absorption and solidification of resins in the chill roll section.

Back 206

False

Front 207

Coated webs normally require ________ dryer temperatures than uncoated webs.

Back 207

higher

Front 208

What are the benefits of the sine wave produced by the hot air dryer?

Back 208

Improved web control

Prevention of corrugating wrinkles

Prevention of web flutter

Front 209

The thin layer of air that travels with the web as it moves through the dryer is called the ___________ layer.

Back 209

boundary layer

Front 210

The first set of rollers to follow the former board are referred to as _______ rollers.

Back 210

guide rollers

Front 211

The guide rollers can be skewed to maintain even ________ on the former

Back 211

tension

Front 212

A closed-head signature that has been folded with a former and two jaw folds will have a spine that is __________the grain direction of the web.

Back 212

opposite

Front 213

What is the correct location of collect cylinders?

Back 213

After the former and before the jaw folder

Front 214

The collect cylinder circumference is nearest _____ times the circumference of the knife cylinder.

Back 214

3

Front 215

On a full web press, a collect cylinder is most likely to be used for ________ size

Back 215

digest size

Front 216

True or False

Ribbon folders commonly use a collect cylinder.

Back 216

True

Front 217

The double-former fold results in a _____ head signature, and is common for newspapers.

Back 217

open

Front 218

Which type of folder most severely limits the press speed?

Back 218

Chopper fold

Front 219

Which in-line gluing system is similar to a flexo printing unit?

Back 219

Pattern Gluer

Front 220

Which perforating device makes angled perforations to direct paper stresses?

Back 220

Gusset Perforator

Front 221

The double-chopper combination folder is designed to improve what property of the folder?

Back 221

speed

Front 222

What is the cutoff dimension for a web press that uses the collect feature?

Back 222

1/2 the circumference of the plate cylinder

Front 223

The movable jaw on a jaw folder seizes the _____ of the signature.

Back 223

spine

Front 224

True or False

On a combination folder, the chopper fold is parallel to the former fold and folds opposite the grain direction.

Back 224

False

Front 225

Suppose a web is 34 wide with a 22 cutoff. What combination of folders is required to create a magazine size signature?

Back 225

Former, Jaw, Chopper

Front 226

Suppose a web is 17 wide with a 22 cutoff. What combination of folders is required to create a magazine size signature?

Back 226

Former, Jaw

Front 227

For the Tensile Strength of Paper Test, what characteristics would describe the most desirable paper?

Back 227

High load and low elongation

Front 228

True or False

Lower-speed litho presses require a tack-rated sequence for process inks.

Back 228

False

Front 229

When preparing the strips for the Tensile Strength of Paper Test, for which dimension of the paper strips is it most important to have a constant measurement?

Back 229

Width

Front 230

In the Water-based Flexo Ink Test, pH regulator is used to _______ the pH level of the ink.

Back 230

raise

Front 231

What term describes a situation where printed litho ink pulls a previously printed ink back up into the ink train?

Back 231

back trapping

Front 232

For the Inkometer Ink Tack Test, ____ cc of ink is used.

Back 232

1.2cc

Front 233

Results from the Tensile Strength of Paper Test should reveal that paper will stretch more in its _______ grain direction

Back 233

cross grain

Front 234

On our tensile strength tester, elongation is measured in, what metric unit?

Back 234

mm

Front 235

In the Water-based Flexo Ink Test, the target viscosity for the ink when using a #2 Zahn cup is ____-____ secs

Back 235

20-25secs

Front 236

Target pH for water-based flexo ink is ____-____

Back 236

8.0-9.5

Front 237

Name 4 benefits of having bearer contact.

Back 237

- smooth rolling contact between cylinders

- eliminates gear backlash

- stabilizes the cylinders

- provides reference datum for packing

Front 238

Bearers are hardened ______ rings at the end of plate and blanket cylinder

Back 238

steel

Front 239

Web offset presses have a small gap of ____-_____" to allow for plate lockup.

Back 239

0.25-0.50"

Front 240

Sheetfed presses have a small gap of ____-_____" to allow for plate lockup.

Back 240

6-8"

Front 241

Bearer compression is greater on older presses. It occurs n the ___________ cylinder.

Back 241

impression

Front 242

True or False

Having a large plate gap decreases the printing area and increases waste.

Back 242

True

Front 243

Plate bending is done in preparation for ___________.

Back 243

mounting

Front 244

True or False

Plate bends are parallel to the lead and trailing edges of the plate.

Back 244

True

Front 245

Plate bends are _________to the pin register system used when exposing the plate.

Back 245

parallel

Front 246

Plate benders require what 3 things to hold plate?

Back 246

pin register system

adjustable bending plates

vacuum system

Front 247

Which type of plate lockup is most common on modern presses?

Back 247

reel rod mechanism

Front 248

To avoid transfer to blanket, the plate gap should be timed the within _________ gap

Back 248

blanket

Front 249

What are the 3 types of blanket mounting designs?

Back 249

premounted bars

prepunched blankets

blanket for gapless presses

Front 250

Smooth gapless blankets reduce ______ and _______, allowing faster speed.

Back 250

bounce and vibrations

Front 251

True or False

The squeeze for compressible blankets is usually .002-.004"

Back 251

False

.004-.006"

Front 252

The squeeze for conventional (non-compressible) blankets is usually _____-_____”

Back 252

.002-.004”

Front 253

What is run out?

Back 253

a problem when bearers or cylinders become out of round

Front 254

Relative to the press, where can a roll stand be located?

Back 254

- inline, ahead of the printing units

- side of press, turner bars required

- larger installations have it in the basement below the press

Front 255

True or False

In the infeed metering section, 3 rollers grip web in 2 nips to provide back pressure.

Back 255

True

Front 256

The 2 lower metering rollers are driven at a variable speed controlled by a ______ motor.

Back 256

servo

Front 257

True or False

The top metering roller is made of rubber and nondriven.

Back 257

True

Front 258

What are butt switches?

Back 258

sensors monitor diameter of expiring roll

Front 259

At what roll diameter does the splicing arm move against running web, when running the flying paster? (inches)

Back 259

8"

Front 260

At what roll diameter does the pressure roller press the new roll against the running web to create a lap splice on the flying paster? (inches)

Back 260

4"

Front 261

The festoon can store up to ____-____ ft of paper.

Back 261

80-100ft

Front 262

What is tension span?

Back 262

area between 2 tension control points, where paper is unsupported

Front 263

When precontitioning, ________ fired pre-heating section heats the web to 175-200°F.

Back 263

gas

Front 264

Web preconditioners use heat and chilling methods to normalize ________ and burn off ______ dust, paper lint and debris

Back 264

normalize moisture

burn off slitter dust

Front 265

What are the 3 factors that affect tension control?

Back 265

tension

length

modulus of elasticity

Front 266

What is modulus of elasticity?

Back 266

the ability for paper to stretch

affects tension control

Front 267

Which web guiding method is most commonly used for later web adjustment?

Back 267

box tilt

Front 268

Which web guiding method is best for folded signatures?

Back 268

centre guided

Front 269

Which web guiding method is best for sheeted jobs?

Back 269

edge guided

Front 270

What are the 3 types of web break detectors?

Back 270

mechanical

optical

pneumatic

Front 271

The pneumatic web break detector uses an ___ jet to blow at the web.

Back 271

air

Front 272

Which web offset ink is common in business forms printing?

Back 272

quickset inks

Front 273

Which web offset ink dries by absorption only and does not truely harden?

Back 273

news inks

Front 274

Which web offset ink hardens rapidly when exposed to energy source?

Back 274

Ultraviolet & Electron Beam Inks

Front 275

What is the ink solvent boiling point range in °C ?

Back 275

243-332°C (470-630°F)

Front 276

Chill rolls set ink by cooling binding _____ to prevent marking imaging area.

Back 276

resins

Front 277

To disrupt the boundary layer, air knives introduce _________ to prevent _________ of solvents

Back 277

turbulence to prevent saturation

Front 278

What are the 3 types of web offset dryers?

Back 278

Hot Air Dryer

Direct-Impingement Dryer

Combination Dryer

Front 279

What does VOC stand for?

Back 279

Volatile Organic Compound

Front 280

What is the most common technology to burn solvents?

Back 280

afterburners

Front 281

Afterburners burn solvents at _____-_____°F for __ secs.

Back 281

1400-1500°F (760-815°C) for 2secs

Front 282

True or False

Afterburners are usually located inside the plant, by the shipping dock.

Back 282

False

usually located outside the plant or on the roof

Front 283

Chill roll tacking reduces web _____ and improves chilling.

Back 283

web slip

Front 284

Remoisturizing applies a _________ ________ solution after the chill rolls.

Back 284

silicone water solution

Front 285

Paper burns at ______ °F

Back 285

451°F

Front 286

True or False

Rotary cutter allow for bleed layouts and increase job waste.

Back 286

False

decrease waste

Front 287

What are the 3 types of perforating devices on a web offset press?

Back 287

Common Hole

Gusset

Pattern Perforator Unit

Front 288

Which perforating device uses a sharp, raised die that is glued to blanket?

Back 288

Pattern Perforator Unit

Front 289

Which perforating device is best for thick stock or large amounts of paper?

Back 289

Gusset

Front 290

Which gluing method uses hypodermic needles lay down thin line of glue?

Back 290

extrusion gluing

Front 291

Who was our tour guide at Metroland?

Back 291

Nathan Matheson, Metroland’s director of business development and administration.

Front 292

What was the web width for the KBA Corola press at Metroland?

Back 292

64"

Front 293

What was the cut off length for the Goss Blue press at Metroland?

Back 293

22.75"

Front 294

What was the max speed for the KBA Corola press at Metroland?

Back 294

75,000 copies/hr

Front 295

What was the web width for the Goss Blue and Red presses at Metroland?

Back 295

35"