Post-press processing methods and technical points of digital printing
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A few years ago, digital printing was still a new thing, and there was still a long way to go from commercial production. The quality of digital printing and people's requirements did have a big gap, and the production efficiency was very low, which made it difficult to meet people's needs.
However, the speed of digital printing changes and development in recent years is completely beyond people's imagination. Today, the production efficiency of digital printing has been greatly improved, and the range of printing materials has become wider and wider. The printing quality and effect of some printed materials have to be impressive. Digital printing has indeed become the most attractive form of printing.
However, from the point of view of binding and finishing, there are still some problems that cannot be ignored in the finishing of digital printing. This article attempts to explore the post-press processing of digital printing, in order to provide readers with some reference.
Consider post-press processing from prepress design
The prepress design will help the successful completion of digital printing and finishing. In digital printing, the quality of prepress design has a great impact on post-press processing costs. Due to the limited paper size used in digital printing and the large number of digital prints being single-sided, the following factors should be considered in addition to the pre-press design that requires digital printing to make the most efficient use of paper.
1. Paper thread direction
Whenever possible, try to match the direction of the silk of the paper with the direction of the back of the finished book. Due to the particularity of the combination of the color material and the paper on the surface of the digital printing paper, if the sheet is folded in the direction of the horizontal thread, the image is liable to break at the folding position. Therefore, digital prints should take into account the post-press process when performing pre-press design.
2. Image position on the sheet
Often, many digital prints design images in the middle of a sheet, but when printed and post-press processed, it is found that this wastes a lot of time and money. For example, designing an image of 6 inches by 9 inches in the middle of a sheet of 8.5 inches by 11 inches, you need to cut all four sides of the sheet when cutting; but if you place the image in a certain On the corners (for example, the upper left corner), only two sides need to be cut, which saves the post-press processing time and reduces the printing cost. However, if the other two sides of the image are bleeding designs, you will still need to crop all four sides of the sheet.
Binding and finishing points
Only by carefully designing and arranging the printing work from the beginning can we ensure the harmony between printing and post-press processing. In production, the following points should be noted.
1. Fold
Since the ink color on the digital print adheres only to the surface of the paper, the folding process is prone to cracking. Therefore, it is best to press the crease before the folding process.
2. Laminating
Laminating the surface of digital prints, especially after printing a large area of the ground, will help to protect the printed matter during post-press processing, especially during cutting or packaging. . It is not necessarily advantageous to perform a single-sided coating on a double-sided print because the uncoated side may be more susceptible to peeling of the printed toner due to frictional effects in subsequent processing.
3. Saddle stitching
Saddle stitching is a good choice for most digital prints, especially for the binding of thinner 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 for collating, folding, stapling and in-line cutting at the same time, which can guarantee the fast delivery required for digital printing.
4. Flat order
When designing a booklet, first of all, pay attention to leave enough room for binding between the booklet and the body. For example, when the O-spiral wire-to-hole ratio is 3:1 (referring to 3 holes per inch), Leave at least 3/8 inch of blank; and when the hole ratio is 2:1, leave at least 1/2 inch of blank. This blank refers to the distance between the booking and the nearest hole.
In order to clarify the specific location of the processing, it is best for the designer to understand the changes of the actual printed paper after digital printing before the digital printing process, which is especially important for digital printing. Most computer design programs do not take into account small changes in the thickness of the printed paper. In digital printing, the color printed on the surface of the paper causes a change in the thickness of the printed sheet. When binding dozens of pages of digitally printed sheets, the cumulative thickness Changes may make the size of the binding calculated by the computer meaningless. Therefore, it is necessary to grasp the sample variation parameters of the actual production paper after digital printing, in order to accurately measure the thickness of the book during the printing design, and to ensure a suitable binding size for the post-press processing.
5. Wireless adhesive binding
As with offset-based wireless adhesive bonding, the wireless adhesive binding of digital prints also takes into account the amount of stapled cut. In addition to leaving a 1/8 inch milling back allowance on the back of the book, a 1/8 inch cut is also required on the other three sides of the book. In addition, a 1/4-inch rubberized area should be left in the lower part of the book cover to prevent the glue from seeping into the next book during binding. Wireless adhesive bonding also requires that the printed bleeding cover should be larger than the original size.
6.Wireless adhesive binding
Whether you believe it or not, wireless adhesive finishing is also an important post-press 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 required for wireless adhesive finishing seems to be somewhat incompatible with digital printing for the short-run printing market, some post-press binding companies have pre-made different colors, styles and different colors commonly used in digital printing hardcover. The size of the hardcover case is used by digital printers. Therefore, wireless adhesive binding has become a common binding method for digital printing.
Integrated post-press processing solution
The quality and speed of digital printing has made it even more compelling, and it has become one of the increasingly widely used printing methods, and most digital prints require almost post-printing to become a practical printing product, and most of them are printed. The processing technology can be applied to the post-press processing of digital printing.
At present, the main postpress processing equipment for digital printing has folding machine, double loop wire, plastic ring binding machine, wireless adhesive binding machine, saddle stitching machine and collating machine. Among them, the folding machine, the wireless adhesive binding machine, the saddle stitching machine can be divided into a floor type and a table top, but usually the saddle stitching machine is a floor type. The collating machine includes two types, vertical and horizontal, of which the vertical type is mostly.
With the development of digital printing, the manufacturers of post-press processing equipment for digital printing are also increasingly active, such as Heidelberg, Mailer Martini, MBO, MBM, Baum, Duplo, and Spiel.
Associates, Standard Finishiing, C.P.Bourg, Southwest Plastic
Binding, James Burn International, Powis
Parker, Rosback, GBR, Brackett, GBC, Best Graphics, Riso and Ab Dick.
It should be clearly stated that not all printers or postpressers can control the finishing of digital printing. If the company has a wealth of digital printing knowledge, understand the special characteristics of digital prints, and has a variety of post-press processing equipment, with strong production and processing capabilities and rich post-press processing experience, then the digital printing of post-press processing It is no longer a difficult job.