How to realize digital printing:
If you want to make post-press processing fine, you must consider post-press processing from the beginning of pre-press design. Pre-press design will help the successful completion of digital printing post-press 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 folding 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 sheet with a size 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 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.
Technology application:
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, pay attention to leave enough room for binding between the staple and the text. For example, when the hole ratio of the O-spiral is 3: 1 (referring to 3 holes per inch), you should 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.
With the rapid development of digital printing, manufacturers equipped with post-press processing equipment for digital printing are also increasingly active, such as Heidelberg, Mailer Martini, MBO, MBM, Baum, Duplo, Spiel Associations, Standard Finishiing, CPBourg, Southwest Plastic Binding, James Burn International, Companies such as PowisParker, Rosback, GBR, Brackett, GBC, BestGraphics, Riso and AbDick.
Investment factors:
In the communication with the heads of some digital printing companies, I feel that they are looking forward to the development of digital printing, mainly for the following two reasons:
First, the financial crisis in the second half of 2008 caused the “employee panic†separation, and the “employment shortage†emerged after the economic recovery in 2009, which made enterprise leaders realize the importance of equipment performance;
Second, with the improvement of people's living standards, employees have higher and higher requirements on the working environment. Many person in charge of the company told me that the same type of work, the same salary and benefits digital printing press, semi-automatic, manual equipment is more difficult to recruit, and equipment with a higher degree of automation is relatively easy to recruit.
Development bottlenecks:
In digital post-printing, the phenomenon of stand-alone investment is more common in China. For example, some small and medium-sized commercial printing plants or the printing centers of some government agencies have purchased digital binding machines; some large book printing plants have purchased digital hardcover equipment; and some packaging companies have purchased digital die cutting and bronzing equipment. There are many post-press processing procedures. To realize the digitization of the entire post-press processing procedures not only invests in huge institutions / organizations, but the technical force must keep up accordingly. At present, less than 10% of domestic companies engaged in digital printing invest in digital finishing equipment. The main reasons are as follows:
1. High price of imported equipment
At present, there is no mature water-ink balance of digital post-press equipment in China. To invest in digital post-press equipment, only a few international brands can be selected and the price is relatively high. The ratio of investment to expected income has also caused many companies to abandon the investment in digital finishing equipment.
2. The influence of traditional ideas
In terms of investment, priority is also given to ensuring pre-press and printing. The pre-press and domestic printing industries have always focused on the development of pre-press and the advancement of printing equipment as a bargaining chip in business negotiations for various companies. This concept has also been transferred to the field of digital printing.
Post-press processing process organization / organized the process of post-press processing towards digitalization
The purchase of a complete set of digital post-press equipment is impossible for many digital printing companies. A single process or a combination of a few processes has become the main form of digital post-press equipment. Such equipment must be well coordinated in terms of business, management, etc. before it can play its due efficiency, otherwise it can only become a tasteless equipment in the printing workshop, which makes many investors feel that it cannot match the price of the equipment.
The quality of operators and corresponding managers
As the saying goes "a good horse with a good saddle", a good device must be managed and operated by a person who understands the device to perform its full function. At present, the situation in the domestic printing industry is that high-quality personnel are equipped in the pre-press and printing links. In addition, at present, domestic training for post-press processing professionals is very rare. I once visited a printing company and bought a digital binding equipment for matching, ordering, and tailoring, but the actual utilization rate was less than 1/3 of the efficiency of the equipment. Packaging safety. I learned from the exchange that on the one hand, there are some The products suitable for the processing and production of this equipment are transferred to other processing equipment because the equipment is not adjusted properly and the processing does not achieve the desired results; on the other hand, the management is not in place, and the production management personnel have insufficient understanding of the equipment, which is suitable for this equipment The processing business is also arranged for processing on other machines. This situation makes the company think that investing in such equipment is a mistake. In the future, Beiren shares will be considered when investing in post-press equipment. Digital post-printing will be excluded from the selection.
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