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Vocabulary: June 15

15 Jun

PRESS

Oscillator: A driven inking or dampening roller that not only rotates but also moves from side to side, distributing and smoothing out the ink film and erasing image patterns form roller. Alternative Terms: oscillating drums, oscillating roller, or vibrator.

Overpacking: Packing the plate or blanker to a level that is excessively above the level of the cylinder bearer.

Vocabulary: June 14

14 Jun

PRESS

Molleton: A thick cotton fabric similar to flanel. It has a long nap and is used to cover form rollers in conventional lithographic dampening.

On-Demand Printing: Commercial-quality printing produced as needed with turnarounds of a few hours or less. Often associated with very short runs of a hundred or fewer pieces and the use of a digital printing press.

Vocabulary: June 11

11 Jun

PRESS

Metallic Ink: An ink with fine aluminum, bronze, or copper powders in its pigment.

Metering Tip: The line of contact between two rollers in the dampening system of a lithographic press.

Vocabulary: June 10

10 Jun

PRESS

Gripper Edge: On a sheetfed press, the leading edge of the paper that rests at the head stops and is grabbed by mechanical fingers known as grippers. The press operator typically marks the gripper edge with an “XXX” before sending the job to the binding and finishing area.

Hickey-Picking Roller: A roller that has synthetic  fibers embedded in its surface, to help it remove hickeys from the surface of an offset printing plate or to fill in the white ring on the plate surface. This roller replaces one of the ink form rollers.

Incline Press: A screen printing press in which the screen maintains a position parallel to the printing bed, but recedes diagonally during the feed/take-off cycle.

Leafing: The phenomena that occurs when metal flakes in metallic inks float to the surface of the ink, giving it a particular luster.

Vocabulary: June 8

8 Jun

PRESS

Front Stops: A series of devices that halt the forward movement of a press sheet on the feedboard. The front stops square the sheet in relation to the printing cylinders and determine the print margin. The front stops are part of the three-point register system. Alternative term: front guides.

Gear Streaks: Parallel streaks appearing across the printed sheet at the same interval as gear teeth on a cylinder.

Vocabulary: June 7

7 Jun

PRESS

Eccentricity: A roller or cylinder that does not rotate in a true concentric circle in relation to its axis. Alternative term: off center; out-of-round.

Flagging: (1) Indicating a web splice so that the spliced product can be removed from the press folder and discarded. (2) Marking printed matter to indicate a change or correction. (3) Inserting small strips of paper into a skid of press sheets as needed to indicate segments of defective printed sheets.

Vocabulary: June 3

3 Jun

PRESS

Dampeners: Paper, cloth, or rubber-covered rollers that distribute water to the printing plate in the lithographic process.

Discharge Printing: Pattern-printing darkly dyed textile substrates with a color-removing chemical to produce a design into which lighter hues may be printed.