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The most popular printing technology |
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| Release time:2013-11-14 Source:admin Reads: | |
| Offset printing is the most popular in printing since the past years; it is a commonly used printing technique in which the inked image is transferred from a plate to a rubber blanket, then to the printing surface. When used in combination with the lithographic process, which is based on the repulsion of oil and water, the offset technique employs a flat image carrier on which the image to be printed obtains ink from screen printing T-shirts, while the non-printing area attracts a water-based film, keeping the non-printing areas ink-free. The Printing Unit consists of many different systems. The dampening system is used to apply dampening solution to the plates with water rollers. The plate cylinder is where the plates containing all of the imaging are mounted. Finally the blanket and impression cylinders are used to transfer the image to the substrate running through the press. The offset cylinder was covered with specially treated cardboard that transferred the printed image from the stone to the surface of screen printing T-shirts. Later, the cardboard covering of the offset cylinder was changed to rubber, which is still the most commonly used material. The inking system uses rollers to deliver ink to the plate and blanket cylinders to be transferred to the substrate. In addition, waste sheets can be used for make-ready. This allows for lower cost preparation so that good paper is not wasted while setting up the press, for plates and inks. Waste sheets do bring some disadvantages as often there are dust and offset powder particles that transfer on to the blankets and screen printing T-shirts, creating imperfections on the printed sheet. The speed of web-fed presses makes them ideal for large runs such as newspapers, magazines, and comic books. However, web-fed presses have a fixed cut-off, unlike rotogravure or flexographic presses, which are variable. |
