5Q: What are the requirements for the performance of the die cutting blade when making a die cut version? If the blade is not properly selected, what problems can it cause? How to increase the service life of the blade?
A: Die cutting knife should meet the following performance requirements: uniform steel material, knife blade and blade hardness combination of appropriate specifications, the blade by quenching and so on. High-quality die cutters usually have a blade hardness that is significantly higher than the hardness of the blade body, which not only facilitates molding but also provides a long die life.
If you choose a non-durable blade, it will lead to incomplete trimming, inaccurate die cutting, and shortened pad life.
To increase the service life of the die cutter, one should select the proper blade and adjust the die cutting pressure slowly from light to heavy. The principle is just to cut the cardboard.
6Q: What are the requirements for the bottom pad and rebound glue in die-cutting processing?
A: The properties of the bottom pad and the rebound rubber also have a great influence on the die-cutting quality. Therefore, they also have high requirements. In general, the bottom pad should be as flat as possible, and the rebound glue should be based on the height of the die cutter. According to the die-cutting product, if the disposition is not good, there will be problems such as poor scrapping and uneven die-cutting.
Round-bore circular die-cutting has higher requirements for the bottom pad, and the most critical is its cut-resistant performance. The surface structure of the die-cutting cutter is still very tight under the millions of cuts. If the bottom pad is not resistant to cutting, the surface structure becomes loose after die cutting for a period of time, resulting in incomplete die cutting, rapid decrease of line speed, and poor die cutting accuracy. Therefore, it is advisable to use a cut-resistant bottom pad and regularly adjust the position of the bottom pad.
7Q: How do you keep the line speeds of the upper and lower drums consistent during round die cutting to ensure die cutting accuracy?
A: The more mature solution is to use the United States DICAR equalizer bottom pad, its working principle is to allow the bottom pad line speed to automatically adapt to the linear speed of the die, so as to achieve the same speed of the upper and lower drum line, fundamentally Solve the problem of uneven carton size die cutting. Of course, a variable-speed motor may also be used to adjust the speed of the die-cutting drum. However, it needs an operator to periodically calculate and adjust it and cannot automatically adapt. In addition, the position of the bottom pad is often adjusted so that the linear velocity of each pad can be kept as uniform as possible.
8 Q: What are the requirements for operators in die cutting?
A: The operator must deeply understand the relevant die-cutting principle, such as round die-cutting, the die-cutting quality is affected by factors such as the die, the bottom pad, and the line speed. When problems occur, they should be able to find the cause immediately and accurately. , symptomatic solution. In general, professionally trained operators can solve most of the problems encountered in die cutting.
9Q: What are the outstanding issues in the die cutting process?
A: What needs to be improved at present is the precision and speed of drum die cutting, and the automatic packaging, folding, gluing, and nail boxing after die cutting or notching. At present, most of China's carton factories still remain at the level of manual operation.
10 Q: What are the suggestions for high-precision post-press processing?
A: To achieve high-precision carton forming, in addition to the above mentioned, it should be considered from the following aspects.
(1) Select a durable die cutter. In the case of round die-cutting, due to its large-volume, high-speed production characteristics, the die cutter must be sturdy and durable. Its steel is compact, the blade is tough, the blade hardens and hardens, and it withstands 100,000 times. Even millions of die cuts.
(2) Select high quality sponge glue. Round die cutting is done in a smaller area and in a shorter time near the tangent point of the two rollers. The sponge glue is compressed in a short time of about 1/48 second. This requires that the roller die Rebound sponge rubber has better elasticity and pressure resistance. Because the ordinary sponge rubber is compressed, it will expand to both sides, squeezing the blades on both sides, which will affect the die-cutting quality and die life.
(3) Long-life wear-resistant primer pads are used. Only when the linear speeds of the upper and lower rollers are the same, round die-cutting can ensure that the die-cut carton size is accurate, but the roller bottom pad will inevitably produce a linear velocity difference after wear, so that the size of the carton becomes smaller, so the primer The mat should be very wear-resistant in order to delay the arrival of this difference.
(4) Using a DICAR equalizer. The equalizer controls the surface speed of the bottom drum and reduces operator error. The equalizer gives the carton diecut dimensions an unprecedented level of precision and extends the life of the bottom pad on the equalizer by more than 30%.
Source "Printing Technology"
