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Core Skill B
Technical Comparison
| Question | Answer |
|---|---|
| What is flexography | Is a method of direct rotary printing, similar to letter press, that uses resilient relief image plates (rubber or photopolymer) Inked by a volume controlled cylinder (anilox roll) that carries a fast drying ink to a variety of substrates. |
| How does a simple flexographic print station work? | Ink tray supplies ink to the rubber roll that is metered using an anilox roll (controls volume). Ink is transferred from the anilox roll to the plate and from the plate to substrate. |
| Unlike the hard metal plates that are used in letterpress work, flexo plates are resilient and displaceable. Flexographic plates can be made of | Vulcanized rubber or a variety of UV sensitive curable-polymer resins such as photopolymer. |
| Traditionally, corrugated printers used sheetfed letterpress presses when working with combined board. What was the problem when printing flexo? | It has always been difficult to achieve holding a higher line count/resolution without crushing the fluting. When the fluting is crushed it reduces the strength of the case. |
| Flexography is the predominant method of printing in the packaging industry and is expanding in other printing segments. What are some of the other printing methods describe in your readings? | Letterpress, offset lithography, rotogravure, |
| In prepress an understanding of the basic differences between offset and flexo are extremely necessary. What are those differences. | Flexo uses kiss impression and a fast drying fluid ink. Letterpress uses a slow drying paste ink and cannot print on plastic films or many of the other materials that flexo handles easily. |
| Of the printing methods described in your readings, which is the oldest? | Letterpress was the first printing method, and its name pretty much describes how it works. |
| Most gravure presses are web-fed (rotogravure). But some are sheetfed and have a flate plate that clamps to the plate cylinder. Other gravure systems use removable sleeve-type cylinders. What are some elements that describe the gravure printing process? | Presses are mostly inline, designed with a dryer unit above each station. The web travels from one station to another with wet ink overprinting dry ink throughout the process. Six to eight color presses are common. |
| One basic component of the flexographic press is the plate cylinder, to which the plate is secured. Flexo plate cylinders are easily removed from the press to allow for offline plate mounting, why? | Unlike offset presses, flexo presses accommodate plate cylinders of different diameters so that print jobs with different dimensions or repeat lengths can be printed on the same press |
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bhsgraphics
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