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Offset press BHS
Offset Press
| Question | Answer |
|---|---|
| Blanket | A fabric placed around the blanket cylinder of the press. It receives the inked image from the plate cylinder. |
| Blanket cylinder | A cylinder of the press which holds the blanket. |
| Bleed | Any printed material which runs off the edge of the page. |
| Chain delivery | Positive control of each sheet as it is placed in delivery position |
| Color separation | Separating artwork of colored prints or transparencies into three or four process colors |
| Continuous tone copy | A full range of tones from white to black. A black and white photograph is one example. |
| Crop marks | Marks placed on the image (photograph or illustration) telling the printer what portion is to be printed. |
| Cylinders | Drum found on the press to support the plate, blanket and the printing stock white it is being printed. |
| Dampeners | Rollers distribute moisture to the plate |
| Dampening solution | Solution which keeps the non-image area of the plate clean |
| Densitometer | An instrument that measures densities of film |
| Density | A very dense area will not allow light to pass through or reflect light from it, while a light area will allow more light to through or reflect from its surface. |
| Developer | A chemical solution which creates an image on a piece of film after the film is exposed to the light. |
| Developing | Preparing the image carrier (printing plate) |
| Distributor roller | Rollers between the fountain roller and the form roller. |
| Dots | Small to large clear areas in a negative or positive made by contact screen. |
| Ductor roller | In the offset inking system, a roller which alernatelv contacts the fountain roller and a distribution roller. |
| Dummy | As it will appear after printing ; a sample specification. |
| Duplicator | A small printing machine |
| Feeder | A section of the press which delivers a sheet to be printed. |
| Flat | A material which supports the film negative or positive |
| Form rollers | Ink roller which re-inks the plate |
| Fountain solution | Water-acid mixture which covers the non image area while printing. |
| Gripper | Devices on the impression cylinder which holds the sheet while its being printed |
| Gripper edge | The leading edge or first part of a sheet to go through the press. |
| Gum | Liquid placed on the surface of the image carrier to protect it when its not being ran. |
| Halftone | A photograph broken up into a variety of dot sizes which gives a graduation of tones. |
| Impression | Placing an image on stock, such as paper. |
| Impression Cylinder | Holds and presses the sheet against the blanket cylinder of the press |
| INK | The material, which comes in many colors, that adheres to the image area of the press. |
| Ink fountain | ink supply area on the press. |
| Ink rollers | Supply ink to the image area of the image carrier. |
| Lithography | Printing from a flat surface; based on the principle that oil and water do not mix. |
| Masking sheets | Stock which will filter out ultraviolet rays to which negatives and positives are attached |
| Masking tape | A light blocking tape used to attach negatives or positives to the masking sheet. |
| Offset lithography | Printing from a flat surface using the transfer image process; based on the principle that water and oil do not mix. |
| Opaquing | Painting out an area so that light cannot pass through. |
| Padding | Gluing one edge of stacked sheets together, used for making scratch pads. |
| Plateband | Space needed to attach the plate to the cylinder. |
| Press | The unit which prints a printed product. |
| Proof | A copy of the final material which is checked against the original. |
| Register | Accurate positioning of material so that it will line up with another. |
| Register marks | Symbols used to line up one image with another. |
| Register pins | Pins which hold the plate flat in exact position while burning plate |
| Signature | Large sheet of paper, containing several pages, folded down to size of single page. |
Created by:
Brighton Graphics
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