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GRC 316

Cal Poly Flexo Study Guide

QuestionAnswer
What are the three types of Flexo inks? Solvent based, Water based, and UV inks
What is the purpose of the vehicle of inks? The vehicle carries the pigment.
What is the definition of Thicksotrophy? Chang in viscosity when agitated/heated.
What are the benefits of solvent based inks? Faster drying, good whetting characteristics, don't have to worry about pH.
What are the drawbacks of solvent based inks? High VOC's,
What makes up UV inks? Monomers, Photo initiators
What is different about UV inks compared to Water based or solvent based inks? No VOC's
What is the difference between drying and curing Drying evaporates the vehicle, curing chemically alters the ink
What are the three ways to change the ink on the press? Change the anilox roll, change the ink, or change the viscosity
What are the five major components of a flexo press? Plate cylinder, anilox roll, impression roller, ink metering roller, doctor blade.
What are the advantages for an inline press Multiple color stations positioned horizontally, ease of access, versatile, on press converting capabilities
What are the advantages of a central impression cylinder Excellent registration, small footprint, good for thinner substrates, films, and foils.
What are the advantages of the stack press? Color decks positioned vertically, can do reverse printing, easy access, large repeats, small footprints.
What does CGATS TR-012 stand for? what does it do? Committee on graphics arts technology standards. outlines the steps to understand color and tone reproduction capabilities of the print process.
Soft mounting tape is used for what? tones
Hard tape is used for what? Solids
What size tape do we use in our labs? 1015
What are the steps in mounting plates? Clean cylinder, Clean plate back, Mount stickyback, register and mount plates
What are the methods to mount plates? Pin Register, Optical, and Video
Which is the fastet way to print? Roll fed
How should UPC's be printed? Picktet Fence style
What percent of envelopes are printed flexo? 65%
What exposure uses a mask? Main Exposure
What are the biggest areas of flexo Corrugate and Flexible packaging
What do you use for intimate contact Matte Film
Corrugate is how much of all flexo? 1/3
What exposure determines shoulder angle? Point exposure
How thick are our plates? .067"
What is metering? It determines ink flow
How many flexo newspapers are in the US 45
What is a good plate relief? .02"
What type of label has the best growth rate? Inmold
Created by: 100000048092088
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