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Lithography Essentials
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Gum Arabic in Lithography
Gum Arabic is used in the processing of lithographic stones or plates to desensitize the non-image areas. It helps to ensure that these areas will repel ink, maintaining the integrity of the image.
Multi-color Lithography
Multi-color lithography involves using multiple stones or plates, each representing a particular color. The different colors are applied in consecutive runs and must be precisely aligned (registered) to produce the final image.
Lithographic Stones
Traditionally, lithography uses limestone, which is grained to a flat surface. The quality of the stone influences the print quality, and the stone can be reused after the previous image is removed.
Lithographic Press Operation
The lithographic press applies even pressure across the printing surface, ensuring that the ink is transferred from the stone or plate onto the paper or substrate with uniform quality.
Offset Lithography
Offset lithography is a widely-used printing technique where the inked image is transferred (or 'offset') from a plate to a rubber blanket, then to the printing surface, which makes it suitable for large-scale print runs.
Tusche
Tusche is a greasy liquid used in lithography for drawing and painting onto stones or plates. It creates tones ranging from light to dark, depending on its concentration and how it's applied.
Grit Sizes for Stone Preparation
The grit size of the abrasives used to grain a lithographic stone defines the texture of the stone's surface, which in turn affects the detail and quality of the printed image. Finer grits give finer details.
Photolithography
Photolithography uses light to transfer a geometric pattern from a photomask to a light-sensitive chemical photoresist on the substrate. It's crucial in the production of integrated circuits and microelectronic devices.
Roll-up in Lithography
Roll-up refers to the process of inking the image areas of the stone or plate using a roller, preparing it for printing. It's a critical step to achieve the correct ink density and distribution on the image.
Chemical Etching in Lithography
Chemical etching is a process to fix the drawn image onto the lithographic stone or plate. A mixture of gum arabic and nitric acid is applied, etching the non-image areas and creating a stronger ink-receptive layer on the image areas.
Principle of Lithography
In lithography, an image is drawn with oily, fat, or wax substances onto a smooth stone or metal surface. The surface is then treated to retain ink in the image areas while repelling ink in the non-image areas.
History of Lithography
Lithography was invented in 1796 by Alois Senefelder as a cheap method of publishing theatrical works. It works on the principle that oil and water do not mix and has evolved significantly since its invention.
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