Image Printing Packaging Mail Limited
Offset Book Printing in China
Updated: 2015-04-10
Tags: Photograph Book, Art Book, Book Binding

As a professional offshore and local book printer, Image PPM is devoted to offering offset book printing services in China for book publishers, advertisement agents and other various clients. We take the advantages of competitive prices, high quality and prompt delivery too. We have a wide range services of books, magazines, catalogues, Pu leather covers, light cartons, heavy boxes, display stands, playing cards, canvas totes, acrylic painting and Pu leather boxes. 

Offset printing, is also called planographic and lithographic. All three iterms describe the method of printing from a flat surface, which are based on the principle that grease and water do not mix. First a greasy image is placed on a flat plate. The image may be drawn directly on the plate with a grease pencil. It may also be on the place photographically instead. Next the water is applied to the place. The water will cover the nonimage area of the plate. Water will be repelled from the image also because WATHE AND GREASE DO NOT MIX! The entire plate is then coated with ink. Ink is a greasy substance and adheres to the greasy image. Ink is repelled from the wet areas of the plate. The paper is then pressed against the surface of the plate and the inked image is transferred to the paper. The process of printing from a flat is shown as below picture.

Offset Printing China

Planographic or lithographic prints from a plane or flat surface, on neither raised nor depressed. The printing image is formed chemically by making some areas of the plate grease receptive and water repellent, while others remain water receptive and grease repellent. Unlike plates for letterpress and gravure (which have their printing surfaces shaped to form the desired image), the printing image on a lithographic plate simply rests upon the plate’s surface. The image can rapidly wear away when paper rubs against it during the printing process. This is especially true when the plates are used on high-speed printing presses. To minimize wear the image on the plate is first offset (transferred) to a rubber blanket. Note that the right-reading image is reversed on the blanket. The paper does not make contact with the printing plate.

Alois Senefelder of Germany discovered the lithographic printing method in1796. He printed directly on paper from a grease image applied to a heavy piece of limestone. Stone lithography is slow and tedious. Today a wide variety of offset printing in China is used on high-speed offset presses and duplicators to more products than any other printing method.

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