Printing Knowledge

Ask a press operator how fast he wants to run a job, and the answer is usually "as fast as the machine will go." Faster running means more impressions per hour, and that is how a shop covers its costs. There is a price, though. Push the speed up and waste starts to pile up just as quickly, and th...…

Every print job begins long before the first sheet reaches a press. It begins with a file, and most files arrive built for a screen rather than for ink. Designers work toward what looks right on a monitor, and nothing in that work accounts for plates, colour separations or paper. That is why a ca...…

An image can look right on a designer's monitor, dull on a client's screen, and different again on the printed sheet, even when every file holds the same color numbers. The reason is that RGB and CMYK describe color in two different languages. Neither model is an absolute physical scale. Both are...…

Even, vivid ink across the printed sheet is a basic quality requirement for any print job. On large color packaging and display work the ink load rises with the format, so the thickness and evenness of the ink film on the plate directly shape how the finished piece looks. Mottled ink, where color...…

A perfect binding line combines collating, book block preparation, cover wrapping, and stacking into one continuous operation. The line described here runs at a maximum speed of 6,500 books per hour, which makes it one of the most widely used binding systems in China. Knowing what each station do...…

Ultraviolet coating is a fast way to add gloss and protection to offset work, but the finish is only as good as the relationship between the ink below it, the primer, and the curing unit. A handful of variables decide whether each sheet leaves the line with an even shine or with dull patches, weak…

Some techniques look advanced until you realise they are simply the ability to move a method from one piece of software into another. The same rules apply everywhere. A print shop file has to satisfy three basic requirements before anything else is discussed.…

Inkjet printers have become inexpensive enough to sit in almost any room. They show up in offices, government departments, small home businesses and ordinary households, and the price on the box is rarely the reason anyone hesitates. The running cost is. Design studios, digital print shops and co...…

Perfect binding lines move quickly from one station to the next, so a setting that drifts out of range soon shows up as a defect in the finished book. Sound quality control rests on two habits. The first is making every stage measurable and standardised. The second is the process design and the m...…

Why Transverse Wrinkles Form Wrinkles that run across the web, most often near the two ends of a finished roll, point to a mismatch between the substrates. The usual pattern is a tunnel where one film stays flat and the other lifts away from the bond line.…

Solvent Adjustment and Its Limits When a packaging printing line needs to run faster, the most direct move is to raise the solvent share in the ink and to favour fast-drying solvents. In practice the room for that change is narrow. The base ink itself sets a ceiling on how far the ratio can shift...…

Print quality is what a customer sees on the finished page, and much of it is decided long before the press runs. Artwork, plate quality, the production process, the machinery and the room itself all leave their mark on the sheet. For a book printer, the hard part is not reaching a good result on...…

Books are judged before a single word is read. The block either sits square inside the cover or it does not, and the difference is usually a millimetre or two at the trim. Cutting and trimming are the last steps that touch every copy in a run, so the tolerances set here decide how the finished bo...…

Perfect binding, often called adhesive binding, carries most of the softcover work that leaves a digital press: novels, catalogs, manuals and annual reports. The method is efficient, but it leans on a long chain of mechanical settings, and one adjustment that drifts can turn a clean book into a r...…

Ink trouble seldom announces itself in advance. Swelling, gelation and the settling that hardens into cake tend to appear once a job is already on the press, with paper loaded and a delivery date fixed. Most of the fixes that circulate through the trade are reactive: the fault shows up first, and...…

Think about the human body for a moment. Someone who pays attention to preventive medicine and looks after their health has a better chance of staying free of illness, living longer, and enjoying an easier life. A printing press behaves in much the same way. When a press runs without breakdowns, ou…

Imported perfect binding equipment falls into two main families, and the difference is not only mechanical. The arrangement of the stations decides how a book …

Book production has always followed the machines that carry it. For most of the nineteenth century a print shop printed the sheets and a separate bindery folded, gathered and finished them, so the two halves of the trade worked to their own schedules. That split faded once printing and binding we...…

Long holiday breaks create a quiet problem for shops that run universal flatbed printers and garment color printers. The machine sits unused for a week or mor…

A press operator running a Heidelberg Gallus 410 recently described a stubborn problem. The color on the sheet ran dark in one band and light in the next, and the fault was most obvious on a heavy solid blue. The anilox roller, the stainless steel doctor blade and the press itself were new, and t...…