Friday, 14 January 2011

LO1

Digital screen printing:
Screen printing is a printing technique that uses a woven mesh to support an ink-blocking stencil. The attached stencil forms open areas of mesh that transfer ink or other printable materials which can be pressed through the mesh as a sharp-edged image onto a substrate. A roller or squeegee is moved across the screen stencil, forcing or pumping ink past the threads of the woven mesh in the open areas.
Screen printing is also a stencil method of print making in which a design is imposed on a screen of silk or other fine mesh, with blank areas coated with an impermeable substance, and ink is forced through the mesh onto the printing surface. It is also known as Screen Printing, silkscreen, seriography, and serigraph.

Gravure:
Rotogravure (roto or gravure for short) is a type of intaglio printing process, that is, it involves engraving the image onto an image carrier. In gravure printing, the image is engraved onto a copper cylinder because, like offset and flexography, it uses a rotary printing press. The vast majority of gravure presses print on rolls (also known as webs) of paper, rather than sheets of paper. (Sheetfed gravure is a small, specialty market.) Rotary gravure presses are the fastest and widest presses in operation, printing everything from narrow labels to 12 feet (4 m)-wide rolls of vinyl flooring. Additional operations may be in-line with a gravure press, such as saddle stitching facilities for magazine/brochure work. Once a staple of newspaper photo features, the rotogravure process is still used for commercial printing of magazines, postcards, and corrugated (cardboard) product packaging.

Hand Etching:
Etching is the process of using strong acid or mordant to cut into the unprotected parts of a metal surface to create a design in intaglio in the metal (the original process—in modern manufacturing other chemicals may be used on other types of material). As an intaglio method of printmaking it is, along with engraving, the most important technique for old master prints, and remains widely used today.

Ink jet:
An inkjet printer is a type of computer printer that creates a digital image by propelling variable-sized droplets of ink on to paper. Inkjet printers are the most commonly used type of printer[1] and range from small inexpensive consumer models to very large professional machines.[2]
The concept of inkjet printing dates back to the 19th century, and the technology was first developed in the early 1950s. Starting in the late 1970s inkjet printers that could reproduce digital images generated by computers were developed, mainly by Epson, Hewlett-Packard (often simply called "HP") and Canon. In the worldwide consumer market, four manufacturers account for the majority of inkjet printer sales: Canon, HP, Epson, and Lexmark, a 1991 spin-off from IBM.

intaglio:
Intaglio (pronounced /ɪnˈtæli.oʊ/ in-TAL-ee-oh) is a family of printmaking techniques in which the image is incised into a surface, known as the matrix or plate. Normally, copper or zinc plates are used as a surface, and the incisions are created by etching, engraving, drypoint, aquatint or mezzotint. Collographs may also be printed as intaglio plates. To print an intaglio plate, ink is applied to the surface and then rubbed with tarlatan cloth to remove most of the excess. The final smooth wipe is often done with newspaper or old public phone book pages, leaving ink only in the incisions. A damp piece of paper is placed on top and the plate and paper are run through a printing press that, through pressure, transfers the ink from the recesses of the plate to the paper.
Intaglio techniques are often combined on a plate. For example Rembrandt's prints are referred to as "etchings" for convenience, but very often they have engraving and drypoint work as well, and sometimes no actual etching at all.

Laser printing:
A laser printer is a common type of computer printer that rapidly produces high quality text and graphics on plain paper. As with digital photocopiers and multifunction printers (MFPs), laser printers employ a xerographic printing process but differ from analog photocopiers in that the image is produced by the direct scanning of a laser beam across the printer's photoreceptor.

Linocut:
Linocut is a printmaking technique, a variant of woodcut in which a sheet of linoleum (sometimes mounted on a wooden block) is used for the relief surface. A design is cut into the linoleum surface with a sharp knife, V-shaped chisel or gouge, with the raised (uncarved) areas representing a reversal (mirror image) of the parts to show printed. The linoleum sheet is inked with a roller (called a brayer), and then impressed onto paper or fabric. The actual printing can be done by hand or with a press.
Although linoleum as a floor covering dates to the 1860, the linocut printing technique was used first by the artists of Die Brücke in Germany between 1905-13 where it had been similarly used for wallpaper printing. They initially described their prints as woodcuts however, which sounded more respectable.
As the material being carved has no particular direction to its grain and does not tend to split, it is easier to obtain certain artistic effects with Lino than with most woods, although the resultant prints can lack the often angular grainy character of woodcuts and engravings. Lino is much easier to cut than wood; especially when heated, but the pressure of the printing process degrades the plate faster and it is difficult to create larger works due to the material's fragility.
Linocuts can also be achieved by the careful application of Sodium hydroxide in a paste to parts of the surface of the Lino. This creates a surface similar to a soft ground etching and these Caustic-Lino plates can be printed in either a relief, intaglio or a viscosity printing manner.
Colour linocuts can be made by using a different block for each colour as in a woodcut, but, as Pablo Picasso demonstrated quite effectively, such prints can also be achieved using a single piece of linoleum in what is called the 'reductive' print method. Essentially, after each successive colour is imprinted onto the paper, the artist then cleans the lino plate and cuts away what will not be imprinted for the subsequently applied colour.

Lithography:
Lithography (from Greek λίθος - lithos, 'stone' + γράφω - graphο, 'I write') is a method for printing using a stone (lithographic limestone) or a metal plate with a completely smooth surface. Invented in 1796 by Bavarian author Alois Senefelder as a low-cost method of publishing theatrical works,[1][2] lithography can be used to print text or artwork onto paper or another suitable material.

Screen print: Screen printing is a printing technique that uses a woven mesh to support an ink-blocking stencil. The attached stencil forms open areas of mesh that transfer ink or other printable materials which can be pressed through the mesh as a sharp-edged image onto a substrate. A roller or squeegee is moved across the screen stencil, forcing or pumping ink past the threads of the woven mesh in the open areas.
Screen printing is also a stencil method of print making in which a design is imposed on a screen of silk or other fine mesh, with blank areas coated with an impermeable substance, and ink is forced through the mesh onto the printing surface. It is also known as Screen Printing, silkscreen, seriography, and serigraph.

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