Chapter 20
This presentation is the property of its rightful owner.
Sponsored Links
1 / 15

Chapter 20 Printing: Graphic Communication PowerPoint PPT Presentation


  • 80 Views
  • Uploaded on
  • Presentation posted in: General

Chapter 20 Printing: Graphic Communication.

Download Presentation

Chapter 20 Printing: Graphic Communication

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Chapter 20 printing graphic communication

Chapter 20

Printing:

Graphic Communication


Chapter 20 printing graphic communication

The process of printing rakes written words and places their image on a material. Printing is applied to a material called the substrate. Originally, almost all printing was done on paper. Today, printing is done on a variety of substances including: paper, glass, plastic, cloth, ceramics, metal, and wood. The result of this mixture is a broad range of printed products. These products include: newspapers, magazines, books, brochures, pamphlets, labels, stickers, clothing designs and signs.


Chapter 20 printing graphic communication

Printing Methods

  • Today, there are six major printing processes:

  • Relief

  • Lithography

  • Gravure

  • Screen

  • Electrostatic

  • Ink jet


Chapter 20 printing graphic communication

Relief Printing

Relief printing the oldest of all printing processes, uses an image that is on a raised surface and it is pressed against the substrate. Pressure forces the ink to adhere to the substrate, producing the printed message.

Relief printing requires that the image be reversed or “wrong reading,” on the printing block, or image carrier.


Chapter 20 printing graphic communication

The two main types of relief printing are relief printing are letterpress and flexography. Letterpress uses metal plates or metal type as the image carrier. Accounts for less than 5 percent of all printing.


Chapter 20 printing graphic communication

Lithographic Printing

Lithographic printing, or offset lithography, is the most widely used method of printing today. Prints from a flat surface. Offset lithography, based on the principle that oil and water do not mix. Discovered by Alois Senefelder.


Chapter 20 printing graphic communication

Fig. 20-4


Chapter 20 printing graphic communication

A “light reading” image is produced on a image carrier called an offset plate. The linked image on the plate is first transferred to a special rubber roller called an offset blanket. This reverses the image. The image becomes “right reading” again when it is transferred to paper as it is fed through the press. Because the original image is first offset to the blanket, the process is called offset lithography. Modern offset presses can produce more than 500,000 copies from a single offset printing rate.


Chapter 20 printing graphic communication

Gavure Printing

Finely detailed items, like paper money and postage stamps, are usually printed using the gravure or intaglio process.

Is the opposite of relief printing. The message is chemically etched or scribed into the surface of the image carrier. Carrier is then coated with ink. Next, the surface ink is scraped off with a doctor blade. This leaves ink only in the recessed areas of the carrier.


Chapter 20 printing graphic communication

Fig. 20-6


Chapter 20 printing graphic communication

When paper is pressed very tightly against the carrier, it picks up the ink in the cavities.

Gavure is an expensive process. It is economical for very long production runs because one gravure plate can withstand several million impressions. In addition to money and stamps, some magazines are printed with this process.


Chapter 20 printing graphic communication

Screen Printing

Screen printing is a very old printing process, dating back more than 1000 years. Uses a stencil with openings that are the shape of the message; The stencil is mounted on a synthetic fabric screen. Paper is then placed beneath the screen, and ink is applied to the screen’s upper surface. ‘finally, a squeegee is pulled across the stencil. This forces ink through the openings of the stencil to produce the printed product.


Chapter 20 printing graphic communication

Fig. 20-6


Chapter 20 printing graphic communication

Screen printing is used too print on fabrics, T-shirt, drinking glasses, PC (printed circuit) boards, and many other products. Also used to print small quantities of very large products, such as posters or billboards.


  • Login