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Communication Technology

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� Learn the different Printing Processes

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� Intaglio– Gravure

� Relief Printing– Letterpress– Flexography

� Offset Lithography� Screen Printing

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� Method of printing from a sunken surface

� Image carrier is usually handcrafted, using an engraving or etching technique

� Lines are used instead of ink cells

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� Paper Money� Postage stamps� Stock certificates� Fancy stationery

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� Example of intaglio printing� Depressed or sunken surface � Image carrier is a cylinder� 20% of all printing sales

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���������������� Cylinder has tiny cells that hold ink for printing

Prints from recessed area

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� Long runs� High quality printing � Very expensive� Millions of copies

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� Packaging� Publications

– Magazines• National Geographic

� Speciality– Money, Stamps, Wall paper

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� Smooth surface� Thin metal plate� Lithograph presses = thousands copies

per hour� Based on principle that water and oil

don’t mix

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� Offset lithography is the most widely used print process.

� About 40% of all print jobs are produced with offset printing.

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� It is an indirect printing process which means that an image is transferred, or offset, from one surface to another

� Right read, wrong read, right read

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� Sheet fed

� Web fed

Continuous web

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� Newspapers, magazines, books, continuous business forms, unit sets, advertising pieces, brochures, posters, greeting cards, business cards, folders, mailers, laser sheets, integrated products, coupons, and art reproductions.

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� Printing from a raised surface – Potato Printing

� Letterpress� Flexography

– The most popular form

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�������������Platen Press

Rotary Press

Flatbed Cylinder Press

��������� Relief Printing� 1st hand carved wood� Books = $$� Moveable Metal type

– Use over and over again� Printing Press

– Johann Gutenberg– 1450

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� Printed from raised surface (relief)� Millions of impressions from 1 plate� Fast drying liquid inks� Not as high quality as gravure or

lithography

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Prints from raised surface

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� Rubber plates or plastic plates

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� Forcing ink through a stencil covered fabric or wire mesh

� Mounted in a sturdy frame

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����1. Prints from raised surface2. Prints from recessed surface3. Prints from smooth surface4. Example of Relief Printing5. Example of Intaglio Printing6. Forcing ink though a stencil covered fabric/ wire

mesh7. About 40% of all printing jobs are printed using this

method8. Explain “wrong reading”9. What is the difference between sheet and web fed?10. Cheaper, but lower quality

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�����������1. Prints from raised surface: Relief Printing2. Prints from recessed surface: Intaglio 3. Prints from smooth surface: Lithography4. Example of Relief Printing: Letterpress or

Flexography5. Example of Intaglio Printing: Gravure6. Forcing ink though a stencil covered fabric/

wire mesh: Screen Printing

�����������7. About 40% of all printing jobs are printed

using this method: Lithography8. Explain “wrong reading”9. What is the difference between sheet and

web fed?

7. Cheaper, but lower quality: Flexography

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