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Research Design, Workflow (pt 1), Ink Jet

by: Andrea Maute

Research Design, Workflow (pt 1), Ink Jet GC 4440

Marketplace > Clemson University > Graphic Communications > GC 4440 > Research Design Workflow pt 1 Ink Jet
Andrea Maute
GPA 3.3
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About this Document

Notes from the power point presentations in class. Includes on slide info and info added by O'Hara
Current Trends and Deviations
Dr. O'Hara
Class Notes




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This 7 page Class Notes was uploaded by Andrea Maute on Sunday January 10, 2016. The Class Notes belongs to GC 4440 at Clemson University taught by Dr. O'Hara in Fall 2016. Since its upload, it has received 61 views. For similar materials see Current Trends and Deviations in Graphic Communications at Clemson University.

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Date Created: 01/10/16
Research Design-444 Why perform experiments? •Find Answers •Improve our Process -Increase efficiency -Remove waste -Improve Quality •Develop new markets •Minimize Risk -Predictability Applied Research -Attempting to solve a known problem Pure Research -Knowing just to know -What happens if...? What info do we want? Predictability -Cause and effect relationships -Correlations (happen together but one doesn’t necessarily cause the other) Test Assumptions See What Happens Scientific Method -Observation •Claims that flexo printing systems should be calibrated to 17% midtone dot gain for the most accurate color mgt. -Problem: Flexo is a high-gain printing system, often up to 30% TVI. Solution: Add a compensation curve Question: Is this really true? -Start with a literature review •Can you find supporting evidence for the specific claim? Develop Research Questions Reduce the issue down to key points Define terms and how they are measured Experimental Design *****-Controlling all extraneous variables (need to pay attention to them because they can affect the dependent variable, if not controlled they represent threats to validity) Don’t focus on “Threats Internal Validity” slide ****Sampling- if your variance (differences) is small your sample can be small If the bound (accuracy of your instrument) is small then the sample has to be big If you can accept more risk you can afford to take a smaller sample size Sample size (n)=t^2 *variance/bound^2 T^2 à(a/2=.05) t^2=4 Data-Driven Prepress Workflow Automation Why do you want to automate? •Remove wasted time -automate time consuming and repetitive tasks -minutes or seconds saved per job times jobs per year •Reduce Errors -automate number-intensive or objective tasks -manual entry of numbers -objective decisions are programmable -leads to cost saving •Refocus Employees -automate non value-added processes •Record of Activity -track actions -searchable record -real time info •Repeatability -job to job -operator to operator -month to month How much time does it take to add the information box? -If it takes 3 minutes and you add 20 items....3X20=60 minutes. 60 minX 5 days=5 hours, 260 hours=6.5 weeks Other uses of automation.. Bearer bars/ color patches Corner marks Job identification Trapping Screening-LPI, Angles, Dot Shape Curve Application File Handling- Copy, Move, Rename, Converting, Version, Email/FTP Workflow Routing Layout/Step and Repeat Plate Distortion- (Cylinder repeat+Plate Package=distortion Factor) Proof Verification Categories of Automation -Preset Tasks Same settings, repeatable actions -Intelligent Tasks Settings varied using data from job/file -Decisions Govern flow, which tasks to take, which settings, etc. Software Available High-End Workflow Software -Esko Automation Engine -Kodak Prinergy (commercial printers) -CGS RealPro Workflow -Hybrid Cloudflow Others -Hotfolders -Apple Automator -Action Links The Workflow software we use will give info to the workflow server and tell it what to do Workflow Software -Handle common tasks automatically -use stored information to complete tasks -server-client model -off-loads computing -consistency among users Start with a PDF and add some task to it (trap, etc.) then it will be outputted (new file(PDF,TIFF,JPG) or action (move/copy, email, etc)) You can string differed tasks together to create a workflow -the output of one task becomes the input of another. JDF Task Launching -Artist launches file to Ink Coverage XML -File URL and inks data -Single option for operator -XML parsed by GOLD scripts=”file is ready” GOLD writes a JDF for proofing task It knows the substrate, press, and plates Automation Engine applies marks (job and file info) and color management Automation Engine Lingo JOB- “special” folder containing files (PDFs) and associated data. Shows up as Blue Folder in AE Pilot TASK: single action such as trapping or RIP TICKET: saved parameters for a task or workflow WORKFLOW: series of tasks in specific order LAUNCH: send a file (PDF) to start processing on a Ticket or Workflow PARAMETER: setting in a task, can be fixed or variable based on job/file Ink Jet and Nanography Ink Jet Ink jet process is a computer to print technology. No image carrier needed, nozzles drop ink Types: 1. Continuous- only some of the continuously generated flow of small ink drops are directed on the paper during printing a. Binaryà the drop has one of 2 charge states. . Nozzle based system which enables a high frequency stream of dots. Pressurized liquid is pressed out of the nozzle. High-frequency excitation results in the constriction of the stream due to fluid dynamics- related effects and the separation of individual drops from the stream. -The individual drops are charged by electrodes -Charged drops are deflected in an electrical field and fed to collecting device i. Uncharged drops attach to the paper ii. Charged drops are deflected into the gutter b. Multi-deflectionà drops get different charges so they go in different directions and go to different positions on substrate. Writing height increases as space between the ink jet head and paper increases......resolution is reduced. Resolution is correlated to speed of substrate and drop frequency. 2. Drop on demandà drop only happens when needed. a. Thermal-heating liquid ink until it vaporizes. Certain quantity is ejected from nozzle bc of pressure from the vapor bubble.....”bubble jet.” Only the ink moves i. Electrical pulse of 2-microseconds is applied to a resistor that raises the temp by 100,000,000 degrees C per second ii. Ink heats to 300 degrees C in vapor explosion iii. Ink leaves nozzle at 10-15 meters/second iv. Desktop color printers use this. 75% of inkjet printers use it. v. Uses a separate head for each color b. Piezoà drop is generated bc of a change in volume within the ink chamber due to piezoelectric efficts...leads to the drop being ejected from nozzle. i. Epson ii. Ejection of ink is generated by mechanical displacement in the ink channel iii. Channel walls are deformed....suction results in one channel and ejection in the adjacent c. Electro-static *Large format ink jet printing systems—most common is about 135 cm but can be 5 to 8m * 1 Pico Liter=10^-12 Liters or 1/100,000,000,000 of a liter *1 million droplets cover an inch of substrate *100 milltion droplets can be dropped per second Print Innovations 1. Greyscale Printheads-ejects drops of varying size 2. Fixed head- print head is width of paper. Enhances production speeds 3. Memjet- 8 inch wide print head, 70,400 inkjet nozzles 4. HP T300- 30-inch web at 400ft./min, 10 rows of 7 4.25-inch printheads in an overlapping pattern for 29-inch print width, pre-coating allows wide variety of substrates 5. Landa (company name) Nanogrpahy- unique digital priting platform using nano-sized color pigments. Invented by John Landa a. Nano-Pigments i. Improved color strength ii. Water based inks jetted onto heated offset blanket iii. Very think ink films-dry on blanket, transfer as dry polymer film for sharp dots and no absorption iv. Reduced drying costs v. Think film keeps gloss of substrate vi. Each droplet goes to a precise location vii. When ink hits blanket it spreads and uses its own water to thin out viii. Thinnest ink image of any process


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