For the processing of digital printing, the author believes that we should look ahead and look back, so as to ensure printing efficiency and quality.
Consider pre-press processing from pre-press design
Prepress design will help the successful completion of digital printing postpress processing. In digital printing, the quality of pre-press design has a great impact on post-press processing costs. Due to the limited paper specifications used in digital printing, and a large number of digital prints are single-sided printing, in addition to requiring the pre-press design of digital printing to make the most effective use of paper, the following factors should also be considered.
1. Paper thread direction
Where possible, try to make the direction of the paper strands consistent with the back of the finished book. Due to the particularity of the combination of the color material on the surface of the digital printing paper and the paper, if folded in the direction of the horizontal thread, the image is likely to break at the folded position. Therefore, the digital print should take into account the post-press processing technology when designing the pre-press.
2. Image position on the printed sheet
Usually, many digital prints design the image in the middle of the printed sheet, but only find out that it wastes a lot of time and money when doing post-press processing after printing. For example, if an image with a size of 6 inches by 9 inches is designed in the middle of a printed sheet with a size of 8.5 inches by 11 inches, the four sides of the printed sheet need to be cut when cutting; but if the image is placed on a certain For each corner (such as the upper left corner), you only need to cut both sides, which saves post-press processing time and reduces printing costs. However, if the other two sides of the image are bleeding designs, you still need to trim all four sides of the printed sheet.
The main points of binding and post-press processing
Only by carefully designing and arranging the printing work from the beginning can the harmony between printing and post-press processing be guaranteed. In production, the following points should be noted.
1. Fold
Because the ink color material on the digital print only adheres to the surface of the paper, the folding process is prone to breakage. Therefore, it is better to press the crease before folding.
2. Laminating
Laminating the surface of digital prints, especially after printing a large area, and then laminating, will help protect the printed matter in post-press processing, especially when cutting or packaging . It is not necessarily advantageous to apply a single-sided coating to a double-sided printed product, because the uncoated side may be more prone to peeling of the printing color due to friction in subsequent processing.
3. Saddle stitch
Saddle stitching is a good choice for most digital prints, especially suitable for the binding of thin books such as guides, brochures and brochures. The binding method is economical and practical, and can be carried out online with other processing methods. It can perform post-press processing of collation, folding, binding and online cutting at the same time, which can provide guarantee for the fast delivery required by digital printing.
4. Flat book
When designing a flat booklet, first of all, we must pay attention to leave enough binding room between the binding and the text. Leave at least 3/8 inch blank; and when the line-to-hole ratio is 2: 1, at least 1/2 inch blank should be left. This blank space refers to the distance between the stitching edge and the nearest line hole edge.
In order to clarify the specific position of the bookbinding process, it is best for the designer to understand the changes of the actual printing paper after the digital printing before the digital printing process, which is especially important for digital prints. Most computer design programs do not consider small changes in paper thickness after printing. In digital printing, the color material printed on the paper surface will cause the thickness of the printed sheet to change. When binding dozens of digital printed sheets, the cumulative thickness The changes may make the binding size carefully calculated by the computer meaningless. Therefore, it is necessary to grasp the sample change parameters of the actual production paper after digital printing in order to accurately measure the thickness of the book during the printing design and ensure that the post-press processing obtains a suitable binding size.
5. Wireless glue binding
Similar to the wireless binding process of offset printing, the wireless binding of digital prints should also consider the amount of binding. In addition to leaving a 1 / 8-inch milling back margin on the back of the book, a 1 / 8-inch cutting volume should also be reserved on the other three sides of the book. In addition, a 1 / 4-inch glue area should be left at the bottom of the book cover to prevent glue from seeping into the next book during binding. The wireless glue binding process also requires that the printed bleeding cover should be a little larger than the text size.
6.Wireless glue binding hardcover
Believe it or not, wireless glue binding hardcover processing is also an important post-press processing method in digital printing and binding. The key to the hardcover process is how to firmly bond the book block to the hard book case to produce a book that can be stored for a long time. Although the cost and time spent in wireless binding and binding hardcover seem to be somewhat unequal to digital printing for the short-term printing market, some post-press binding companies have prefabricated different colors, different styles and different commonly used digital hardcover The size of the hardcover book case is for digital printers to choose. Therefore, wireless adhesive binding hardcover has also become a commonly used binding method for digital printing.
Integrated post-press processing solution
The quality and speed of digital printing make it more eye-catching and become one of the increasingly widely used printing methods, and most digital prints almost need to be processed after printing to become a practical printed product, and most post-printing The processing technology can be applied to the post-press processing of digital printing.
At present, the main post-press processing equipment for digital printing include folding machines, double-loop and plastic loop binding machines, wireless glue binding machines, saddle stitching staplers and collating machines. Among them, folding machine, wireless glue binding machine, saddle stitch stapler can be divided into floor type and desktop, but usually saddle stitch stapler are floor type. There are two types of collating machines, vertical and horizontal.
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