Printing means reproducing words or images on paper, card, plastic, fabric, or another material. It can involve anything from making one reproduction of a priceless painting to running off many copies of the newest Harry Potter. Why is it called printing? The word “printing” ultimately comes a Latin word, premarket, which suggests to press; almost every sort of printing involves pressing one thing against another.
Although there are many various variations, typically informasi percetakan involves converting your original words or artwork into a printable form, called a printing plate, which is roofed in ink then pressed against pieces of paper, card, fabric, or whatever in order that they become faithful reproductions of the first. Some popular sorts of printing, like photocopying and inkjet and laser printing work by transferring ink to paper using heat or electricity and that we won’t discuss them here; the remainder of this text is dedicated to traditional printing with presses and ink.
Printing is tough, physical work so it’s always through with the assistance of a machine called a press. The only(and oldest) quite press may be a large table fitted with an overhead screw and lever mechanism that forces the printing plate firmly against the paper. Hand-operated presses like this are still occasionally wont to produce small volumes of printed materials. At the opposite end of the size, modern presses wont to print books, newspapers, and magazines use cylinder mechanisms rotating at high-speed to supply thousands of copies an hour.
Types of printing
The three commonest methods of printing are called relief (or letterpress), gravure (or intaglio), and offset. All three involve transferring ink from a printing plate to whatever is being printed, but all works during a slightly different way. First, we’ll compare the three methods with a fast overview then we’ll check out all in far more detail.
Relief is that the most familiar quite printing. If you have ever made a potato print or used an old-fashioned typewriter, you’ve used letterpress. The essential idea is that you simply make a reversed, sticking-up (relief) version of whatever you would like to print on the surface of the printing plate and easily cover it with ink. Because the printing surface is above the remainder of the plate, only this part (and not the background) picks up any ink. Push the inked plate against the paper (or whatever you’re printing) and a right-way-round printed copy instantly appears.
Gravure is that the exact opposite of letterpress. Rather than making a raised printing area on the plate, you dig or scrape a picture into it (a bit like digging a grave, hence the name gravure). once you want to print from the plate, you coat it with ink therefore the ink fills up the places you’ve dug out. Then you wipe the plate clean therefore the ink is far away from the surface but left within the depressions you’ve carved out. Finally, you press the plate hard against the paper (or other material you’re printing) therefore the paper is pushed into the inky depressions, learninga pattern only from those places.
Offset printing also transfers ink from a printing plate onto paper (or another material), but rather than the plate pressing directly against the paper, there’s an additional step involved. The inked plate presses onto a soft roller, transferring the printed image onto it, then the roller presses against the printing surface—so rather than the press directly printing the surface, the printed image is first offset to the roller and only then transferred across. Offset stops the printing plate from wearing out through repeated impressions on the paper, and produces consistently higher quality prints.