Solve the seven problems in carton processing die-cutting

Die-cutting is a key step in carton processing. How to ensure the quality of die-cutting is a problem that printing companies are very concerned about. At present, the main problems faced by carton printing plants are long change time, poor accuracy of printing and cutting, poor die cutting quality, excessive paper size, too many connection points, irregular mark lines, slow production speed, and reject rate. higher. This article will answer the questions above for the printing factory one by one.

Problem I: Long change time

The preparatory work before the change of version should be done well. Using the centerline of the device as a reference, die-cutting tools can be set easily and precisely, including full-size die cuts, pre-installed bottom stencils, and more. At the same time, the pre-installation of the tool and the fine adjustment on the machine also reduce the adjustment time of duplicated products. Under a good management system, it is usually possible to repeat the product change-over time, including automatic stripping, within 30 minutes.

Problem 2: Poor accuracy of printing and cutting

At present, users are increasingly demanding the high quality of printed products, and the design of packaging boxes is becoming increasingly complex. The complex box type has a correspondingly increased precision requirement for the die-cutting quality. In order to maintain the error range of ±0.15 mm, a qualified die-cutting machine must be used, and attention should be paid to the adjustment procedure, especially the timing of the arrival of the paper-feeding table and paper. . .

Problem 3: Poor die-cutting quality and paper size

Low-quality cardboard, such as recycled cardboard, makes the die-cutting process more difficult. In order to achieve good die-cutting quality, the operator must find out the correct preparation method, especially the method of filling the bottom, and can maintain the sharpness of the die cutter by gradually pressurizing and regionally compensating the pressure. For products using a lot of knife lines, balancing the knife plate is very important, which can significantly reduce the time to make up the pressure. In addition, according to different product requirements, such as typesetting, cardboard quality, etc., to choose different hardness of the strip.

Problem 4: Too many connection points

The end user of the carton always requires smaller and fewer joints, while the manufacturer always allows the machine to run faster, which increases the operator's difficulty. To reduce the difficulty, the connection point should be hit with a sharpening machine at the point of force. Use hard glue or cork on the side of the knife that needs to make a connection point to prevent the connection point from breaking, so that the connection point can be smaller and less.

Puzzle five: irregular lines

Taking into account the need to fold the gluing case, the carton must have good indentation lines. What's more, when these boxes are run on automatic packaging machines, the opening force must be consistent. In this way, selecting the right type of trace when die-cutting is an essential element. According to the thickness of the paper, the height and width of the mark are selected, and appropriate marks are bonded to the die-cut base plate. The indentation can achieve higher quality and make the box easy to fold.

Problem 6: Slow production

Many carton printers have relatively low die-cutting speeds for die-cutting machines, such as 2000-3000 sheets/hour, while some presses have die-cutting machine speeds as high as 7,000-7,500 sheets/hour. With modern automatic die-cutting machines, operators can easily achieve the highest production speeds. Optimize the production speed by using the tools recommended by the equipment manufacturer. In addition, we can achieve high quality products.

Problem 7: High scrap rate

Most printers often have high scrap rates. There will be some scrap at the beginning of the die-cutting adjustment, which can be reduced by using the right tools and the right steps. The waste products during operation are generated by shutdown and jamming. Correct adjustment and accurate tool preparation can reduce scrap rate. In addition, manual scrapping will also increase scrap rates and reduce profit margins.