Off set lithography
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Transcript of Off set lithography
OFF-SET LITHOGRAPHY
PRESENTATION BY:
IMPRAIM – SWANZY ENOCK
Graphic Design Tutor @ Ahantaman Girls’ Senior High Sch.
Email: [email protected]
Meaning
Litho means stone and Graphy means writing or drawing
Off-set – is a printing process using ink transfer
It is a method of printing in which inked impressions are transferred onto paper from another surface
Lithograph is a picture printed using a stone or metal block on which an image has been drawn with thick oily substance that attract ink
Off – set Lithography
Is a method of making prints from a flat surface usually a stone or metal plate
In off-set lithography, the printing surface (substrate) and non-printing surface are on the same level
Lithography is based on the fact that grease and water do not mix
GREASE
WATER
A German printer called Alois Senefelder in 1796 discovered this principle.
1771 1834
Making a lithographic print
To make a lithographic print, the artist first draw the image on the stone with grease based lithographic crayon.
The stone is treated with a light acidic bath to fix the image and soaked in water.
The water is absorbed by the stone only in the areas not coated with grease and repelled by water soaked background areas.
• Paper is placed on the stone and the pressed gently with the roller for the image to be transferred onto the paper.
• Remove paper after the image is transferred.
• Allow it to dry.
Off-set lithographic machine (printer)
The off-set lithographic machine operate in five systems
1. Feeding system
2. Dampening system
3. Inking system
4. Printing/impression system
5. Delivery system
The Printing press
We have three major procedures. These are:
PRE – PRESSDESIGNINGFILMINGPLATING
PRESSPRINTING
POST - PRESSPRINT FINISHINGCOLLATINGBINDING/STITCHINGGLUEINGTRIMMING
Equipments at the press
PAPER CUTTING MACHINE IMAGE SETTER
PLATE MAKEROFF-SET PRINTING MACHINE
STITCHING MACHINE
LASER JET PRINTING
SCANNER
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