Solve seven problems in carton processing die cutting
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Die cutting is a key step in carton processing. How to ensure the quality of die cutting is a problem that printers are very concerned about. At present, the main problems faced by carton printing factories are long plate changing time, poor precision of printing and cutting, poor die cutting quality, more paper, too many joints, irregular traces, slow production speed, and scrap rate. higher. This article will answer the above questions one by one for the printing house.
Problem 1: Long changeover time
Preparations before the change of the plate should be done well. Using the centerline of the device as a reference, you can easily and accurately set the die-cutting tools, including full-size die-cuts, pre-installed bottom plates, and more. At the same time, the pre-assembly of the tool and the fine-tuning on the machine further reduce the adjustment time of the duplicate product. Under a good management system, the time for changing the product, usually including automatic scrapping, can be completed within 30 minutes.
Problem 2: Poor precision of printing
At present, users are increasingly demanding high quality of printed products, and the design of packaging boxes is becoming more and more complicated. The complex box type also has a corresponding improvement on the precision of the die-cutting quality. In order to maintain the error range of ±0.15mm, it is necessary to use a qualified die-cutting machine, and at the same time pay attention to the adjustment step, especially the time when the paper-feeding table and paper arrive at the front gauge.
Problem 3: poor die cutting quality and more paper
Low quality paperboard, such as recycled paperboard, makes the die cutting process more difficult. In order to achieve better die-cut quality, the operator must find out the correct preparation method, especially the method of bottoming, which can maintain the sharpness of the die cutter by stepwise pressurization and regional pressure compensation. For products that use a lot of cut lines, it is very important to balance the die, which can significantly reduce the time for replenishment. In addition, it is necessary to select strips of different hardness according to the requirements of different products, such as typesetting, cardboard quality, and the like.
Problem 4: too many connection points are too big
The end user of the carton always requires a smaller connection point, and the manufacturer always makes the machine run faster, which increases the difficulty of the operator. In order to reduce the difficulty, the connection point should be at the point of force, use a wire grinding machine, use hard rubber strip or cork at the edge of the knife that needs to make the connection point to prevent the connection point from breaking, so that the connection point can be smaller and less.
Problem 5: Irregular traces
Considering the need for a folding paste box, the carton must have a good indentation line. More importantly, when these boxes are run on an automatic packaging machine, the power to open must be consistent. Thus, selecting the appropriate type of trace during die cutting is a fundamental element. Depending on the thickness of the paper, the height and width of the trace are selected to bond the appropriate traces to the die-cut substrate, which results in higher quality and easy folding of the box.
Problem 6: Slow production
Die-cutting machines in many carton printers have relatively low die-cutting speeds, such as 2000-3000 sheets per hour, while some printers have die-cutting machines that can cut 7,000-7500 sheets per hour. With modern automatic die cutting machines, operators can easily achieve the highest production speeds. Optimize production speeds by using tools recommended by equipment manufacturers. In addition, it can also 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. Waste during operation is caused by downtime and paper jams. Correct adjustment and accurate tool preparation can reduce scrap rate. In addition, manual waste will also increase scrap rates and reduce profit margins.