Karteikarten
Printing Processes Midterm
Karten in diesem Stapel (45)
- 1Types of Problems in Makeready1. Printing Unit Problems
2. Ink Problems
3. Paper Problems - 2How To Reduce DowntimeHave a Spare Blanket
Pre-Condition Paper
Buy Good Quality Ink
Track and Compare Performance - 3What makes good quality paper?Free of dust and lint
Absorbs ink well
Clean and bright is always right - 4Why is pre-makeready importantReduces downtime
Improves efficiency - 53 Keys to EfficiencyScheduling
Teamwork
Training - 6Glossy ink should be used….….on glossy paper
- 7Types of MakereadySimple - 1 colour, 1 plate change
Partial - 4 colour, 2 plate changes
Full - 4 colour, 4 plate changes - 8Standard RH35-50%
- 9WhitenessThe ability to reflect all colours equally
- 10BrightnessThe wattage of paper
- 11Steps for Makeready1. Check instructions
2. Check press is running in good condition
3. Customer tells expectations
4. Get a signoff
5. Check blanket condition
6. Clean and safe environment - 12Short Fibres areshort and smooth
- 13Main Makeready OperationsMaintenance, inking system washup, setting of sheet handling, plate mounting, condition blankets, pre-setting ink fountains, make trial impressions, adjust register, achieve colour/quality expectations
- 14What is Lignin30% of a tree
Turns paper yellow
Needs to be removed - 15Paper is what % water and what % pulp after the wet end?80%
20% - 16How is a Watermark made?Dandy Roller
Wire mesh shaped like the watermark - 17Long fibresLong and strong
- 18Ingredients of PaperFillers - calcium carbonate, titanium dioxide
Pigments
Pulp
Starch (sizing)
Cellulose - 19Paper is what % water and what % pulp in the wet end?99%
1% - 20Calendaring ProcessGoes through stack of rollers, each roller adds a layer of coating
- 21QC DevicesDensitometer
Pantone Book
Colour Bar
Registration Marks - 221 Jumbo paper roll is equivalent to what20 tonnes
1 streetcar - 23Ink is ___% the cost of paper for a job10%
- 244 Basic Sheet SizesBond 17x22
Uncoated Book 25x38
Cover 20x26
Newsprint 24x36 - 25Standard LightingD150
5000K - 26Paper accounts for ____% of the costs of a job25%
- 27Most common printing sequenceKCMY
- 28What does sizing doMakes paper less wettable
- 29What is basis weight?The weight of 500 sheets of paper at the basic size
- 30Wavy EdgesWhen dry paper goes into a humid environment
- 31Tight EdgesWhen humid paper goes into a dry environment
- 32What are the two types of pulping?Mechanical and Chemical
- 33Why is grain long preferred on press?Loads better and causes less tension
- 34What does coating do?Creates ink holdout
- 35How long does it take paper to climatize?Full day
- 36Paper ProblemsHickeys, piling, linting, picking, back edge curl, surface rupture
- 37Controlling quality of materials1. Selection&Purchase
2. Receiving/Handling/Inspection
3. Proper Storage
4. Proper Use - 385 Basics of Quality Control1. Standardization
2. Specifications
3. Inspections
4. Proper Handling & Storage
5. Record Keeping - 39DeckleHow wide a machine is
- 40What is cellulose Fibre?Soft or Hard wood
- 41What do fillers improvesmoothness
opacity
colour - 42SupercalendaringMaking paper and then calendaring it later on another date
- 43What % of goods are printed Litho?Over 40%
- 44What causes the wear of Blankets?Texture of paper
Ink coverage
Stickiness of Ink
Impression settings - 45How many sheets do you use when changing ink densities before it is good to reprint?40-50
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- Review for the midterm!
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