The establishment of the JDF standard reflects the overall trend of digital prepress technology in-depth development of printing and post-press processing. The purpose is to achieve the integration of the three major processes of prepress, printing and post-press processing, as well as the integration of production activities and business management activities. It helps companies to organize production according to standardized procedures. However, it may not be the printing companies that bear the brunt of the influence of the JDF standard, but the companies or departments that are engaged in the research and development of equipment and systems.


introduction

In fact, post-press processing has no effect on print quality, but it affects print quality. The quality of printing depends on prepress and printing processes, equipment, materials, and technology. It is also related to operator and factory management. One of the goals of establishing a JDF standard and then developing a digital workflow system is to minimize human factors to the end result. The impact of the formation of a stable and continuous production process. The quality of printing is controlled by many factors and the relationship is quite complicated. Judging the print quality is not an easy thing because the print is first of all a visual product, subjective quality judgment is unavoidable. However, the subjective quality judgment also brings about the randomness or personality of the result. The judgment result varies from person to person.

Printed matter should be a complete industrial product. In addition to providing graphic content, it should also have the use of functions that meet the needs of consumers, and sometimes it is necessary to protect the printed content, and it may also serve as a beautification. The use of print functions or other additional attributes cannot be provided by prepress and printing processes, and it is mainly guaranteed by postpress processing.

Since the post-press processing technology is basically independent of the printing quality, the quality of the post-press processing inspection and evaluation method is also different from the inspection and judgment of the printing quality. It should have its own unique inspection method and evaluation standard. However, it must be pointed out that the establishment of the JDF standard did not solve the problem of quality inspection and evaluation of post-press processing because the JDF standard was neither a print quality nor a print quality standard. In fact, the JDF standard is used to guide system integration, digital workflow software development, and equipment production. It considers the standardization of production from the system perspective and strengthens the link between production resources and elements.

Post-printing JDF process

JDF regulates production behavior and guides equipment manufacturing and system software development by defining critical printing processes or processes. To sum up, there are 28 prepress processes defined by the JDF standard, in addition to the 10 general processes involving commercial activities and corporate management, such as layout control, color control, preflight inspection, ink zone generation, color separation, and imposition. Etc.; two printing processes, namely traditional printing and digital printing. The earlier version of integrated digital printing was cancelled due to the addition of a combination process node in the new version of the JDF standard. Although the number is small, the content of control is very large, and thus it is not simple. . Post-press processing faces a large number of production processes and equipment, so the JDF-defined post-press processing process is also the most, a total of more than 40 kinds.

In general, the post-press processing process is divided into two major types of books and packaging, but some processes apply to both, such as cutting, punching, tying, and carton packaging. In principle, each type of post-printing process corresponds to a device. A slightly more complex device may be decomposed into two processes. For example, a device that provides die-cutting and indentation functions at the same time can be decomposed into two types of post-printing processes: die cutting and indentation. However, the multifunctional features of post-press processing equipment are not as typical as those of digital printing machines. Currently, digital printing machines that face the commercial market are often integrated before printing (called digital front-end systems), printing, and post-press processing.

Post-press processing related to books and magazines includes book case preparation, book cover making, book cover insertion, soft cover application, creases, folding, collating, matching posts, inserts, spine preparation, gluing, and spine attachment. Binding, metal clip binding, plastic comb binding, spiral binding, ring binding, saddle stitching, lock stitch binding, plastic wire binding, wire comb binding, capping cloth, sealing and cutting . It can be seen that JDF has defined the postpress printing process quite well and may be related to the equipment manufacturing companies participating in the standard setting.

The post-press processing processes mainly used for packaging include number printing, laminating, indentation and die cutting. It can be seen that the definition of the packaging and post-printing process by JDF is not yet sufficient, and it may be that the new version of the JDF standard needs to be added.

There are many processes it is difficult to define whether it should belong to the book printing or packaging printing processing, such as cutting paper, labeling, punching, stacking paper, tightening and baling, carton packaging, bale wrapping, winding packaging and web cutting. Wait.

The main purpose of listing these processes is to introduce the overall concept of the JDF standard, to understand the relationship between the JDF standard and prepress, printing, and postpress processing, to specify which features can be implemented through the JDF standard, or to allow entry points to solve problems.


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