Exam 2 Flashcards
Flat
The assembled masking sheet with pieces of film attached. Used to make a plate.
Masking Sheet
A sheet of material that blocks light and is used in the negative stripping process.
Actinic Light
Exposes emulsion to blue light and ultraviolet light.
Visual Spectrum
The wavelengths that stimulate our optic nerves comprise the visible spectrum. The wavelengths range from 400-700 millimicrons (mu).
Imposition
Refers to placing images in the correct positions on the printing plate so they print in the desired location on the final pretend sheet.
3 Imposition Factors
1) The design of the printed piece
2) The type and size of the press to be used
3) Type of paper or substance
PIS
Simplest form of printing, one side imposition
Sheetwise Imposition
Two printing plates are used in order to print one image on the front of the material and a different image on the back of the material.
Ganged Imposition
This is when a variety of jobs are printed on the same sheet and then cut because their size is much smaller than what the printer can print. This can do 2up, 3up and 4up.
Work-and-Turn Imposition
Utilizes on plate to print on both sides of a single piece of paper. The first sheet is printed on one side, the pile is turned over and the sheet is fed through the press again. One plate, two sides, two up.
Signature
A large sheet that is printed, folded and then trimmed to form a portion of a book or magazine.
Gripper Margin
Signified by the XXX and is the edge that the press with grab the sheet (plate) to start with, i.e: the side that will go into the press first.
pH Scale
Metric scale that shows how acidic (14) or alkaline (0, vinegar) )substance are. It stand for the potential of hydrogen.
Proofing
The approval that is received from the customer for the job
Press Proofs
Utilize the same type of ink and paper as the final job
Photomechanical Proofs
Require no large investment in special proofing equipment and generally use existing platemaking equipment.
Color Proofs
- Transparent Color Proofs: are generally formed from separate sheets of clear-based plastic.
- Opaque Color Proofs: are generally prepared by adhering, exposing and developing color emulsion on a special slid-based sheet successively.
To View Color Proofs Accurately
Utilize 5,000 K temperature emitted from an artificial source.
Hickey
Results from a linty or poorly coated paper, but it is more commonly a results from ink that is too tacky.
Smashed Blanket
Occurs when too many materials are pushed through a press and indent on the printing press blanket (plate)
Glazed Blanket
Cased by improper cleaning and causes the blanket’s pores to fill wit ink, ink solvent and gum.
Bindery
The most dangerous area
Cutter
Guillotine Cutter
Padding Compound
Two thin coats are needed (used for the memo pads)
Scumming
Occurs when the non image area accepts ink