In the post-press processing of digital printing, since digital printing has different characteristics from traditional book printing, there are many places to pay attention to.

Experience 1: It is not advisable to cover the film immediately after printing 

Process Description: The film is a printed matter that covers the surface of the printed matter to form a paper-plastic composite. The surface of the printed matter is covered with a transparent plastic film, which can enhance the brightness of the printing surface, wear resistance, waterproofness, heat resistance, antifouling and the like. 

Problem Description: After the film is printed on the digital book printing, the printing will appear foaming. This is because the ink layer usually contains digital oil, and the adhesive cannot penetrate the ink layer normally. 

Solution: Adjust some of the processes in the digital printing production process, and try to let the printed products be placed for a period of time after printing.

Experience 2: Die cutting, indentation emphasizes precision 

Process introduction: The method of cutting a certain type of paper or paperboard according to a certain specification and cutting into a certain shape by a knife is die-cutting; using a steel wire according to a certain specification, pressing an impression on paper or paperboard, so as to use the printing mark to take paper or cardboard is bent, this method is called indentation. 

Problem Description: At present, with the demand for personalized products, small batches, and variable packaging products, some packaging products are also printed by digital printing. The bending and bonding parts of the packaged products need to be realized by die cutting and indentation. Die-cutting, indentation common specifications are not right, the product is skewed or overlapped, etc. Most of the problems are not related to the size uncertainty. 

Solution: The typesetting size should be calculated strictly according to the customer's processing requirements, and the actual sample should be measured and audited to avoid the use of errors and cause large losses.

Experience 3: Hot melt adhesive temperature should be mastered 

Process Description: Binding is a process in which a printed paper, including illustrations, covers, etc., is folded into a signature according to different specifications, and is subjected to a series of processing procedures such as flattening, gluing, cutting, and finally into a book. The process is simple, the technology is mature, the cost is low, and the binding efficiency is high. 

Problem Description: The quality of the binding quality is directly related to the quality and appearance of the book. The temperature is too high, the rubber is easy to age, and it does not work. If the temperature is too low, there is a phenomenon of stickiness and paper jam. 

Solution: When using hot melt adhesive binding, the hot melt adhesive should be heated to a certain temperature before production, generally controlled between 150 ~ 200 ° C, the optimum temperature is 170 ~ 180 ° C and the temperature should be stable.