Analysis of the problem of folding and binding of digital printing

In the digital fast printing industry, late folding and binding occupy a considerable proportion. As a quick printing shop, binding is indispensable.

Digitally printed sheets may appear cracked at the image printed after creasing or folding. This may be due to the drying of the paper, and the more quantified the paper, the more likely this is. Therefore, to avoid cracks, the paper should be kept at a proper humidity and not too dry. In addition, folding the paper in the direction of the paper web can also avoid the occurrence of breakage at the crease. If you are processing books and digital printing, the orientation of the paper should be parallel to the spine of the final finished book. Of course, laminating the printed paper can also prevent cracks from appearing at the printed hinges. Indentation should also pay attention to the depth of indentation should be moderate, if you use the indentation machine, should pay attention to speed not open too fast.

At present, domestic digital printing shops use more or flat-booking, especially in the form of wireless glue binding, which is not only beautiful, but also bound firmly. In the design of flat-books, it is important for post-press processors to understand the changes in the actual printed paper after digital printing. Most computer design programs do not consider slight changes in the thickness of printed paper. In digital printing, the color material printed on the surface of the paper causes a change in the thickness of the printed sheet. When the digital printed sheets are bound in tens of pages, the accumulated thickness Changes may make the computer's carefully calculated binding size meaningless. Therefore, we must master the proof change parameters of the actual production paper after digital printing in order to accurately calculate the thickness of the book during the printing design, so as to ensure the proper binding size after the printing process. Like the offset printing of offset printing, the glue binding of digital prints also needs to consider the amount of cut. In addition to leaving a 1/8-inch back allowance on the back of the book, a 1/8-inch cutout is also required on the other three sides of the book.

In addition, a 1/4-inch glue area should be left in the lower part of the book cover to prevent glue from seeping into the next book in the binding. The wireless glue binding process also requires that the printed cover should be larger than the text size. Wireless glue binding finishing processing is also an important post-press processing method in the digital quick-binding binding mode. The key to the hardcover process is how to bond the book block to the hard case and produce books that can be stored for long periods of time. Although the cost and time spent on the adhesive binding of wireless adhesives seem to be somewhat out of proportion to the digital printing for the short-run printing market, some post-printing companies have pre-prepared different colors, styles, and differences commonly used in digital printing. Hardcover bookcases of the size are used by digital printers. Therefore, the binding of wireless adhesives has become a common binding method for digital printing.