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Core Skill F
Key materials used on press - Introductino to Flexo Plates
Question | Answer |
---|---|
What is plate distortion? | It is the compensation for plate elongation that occurs when wrapping a plate around a cylinder. |
Caliper | Total thickness of the plate |
Floor | Non-printable area of plate |
Image area | Printable surface of the plate |
Shoulder | Support for the printable area |
Plate backing | Material that is on the back of the plate to provide stability |
Relief | The distance between the floor and the top of the image |
What was the first type of printing plate used? | Hand Engraved Rubber |
What are the five basic steps to making a photopolymer plate and the purpose behind each of them? | 1. Back exposure to harden the floor and establish the relief depth 2. Face exposure through negative to harden the relief printing area 3. Washout to remove unexposed photopolymer 4. Drying to remove absorbed water or solvent 5. Post Expose and Detack |
What two configurations are rubber plates available in? | Molded and laser engraved |
Photopolymer materials are available in two forms, what are they? | Liquid and Sheet |
Ozone is an omnipresent gas that is created by the interaction of UV light and oxygen and can be harmful to photopolymer plates? What defect occurs from ozone attack? | Fine cracks in the surface of the plate |
Flexo film for plate making is available in two thicknesses, what are they and which one is recommended? | .004 and .007, however .007 is desirable as it is easier to handle and store without kinking |
What is meant by capped plates? | The cap layer is slightly harder photopolymer material than the base layer and does not distort under impression as an uncapped plate does. |
What is the answer to What makes a good printing plate? | Prepress is very criticall, garbage in garbage out, artwork must be correctly compensated, plate caliper, and of course plate storage. |