Analysis of the sticking failure of aluminum foil cap

The sticking phenomenon of beer aluminum foil caps in production and processing is the most common die-cutting quality accident. The aluminum foil cap label itself is a very soft metal material and does not have a certain stiffness like the paper and the like being cut. If it cannot be strictly cut in accordance with the processing technology requirements, it will be difficult to ensure the die cutting quality of the aluminum foil cap label.

Factors associated with the adhesion of foil caps are:

1. The foil cap must be coated with a varnishing process during the printing process. The varnish can increase the luster, smoothness, wear resistance and flexibility of the cap of the aluminum foil and can also play a role in the die-cutting process. Protect the role of die-cutting tools. In the cutting line where there is no printing ink, it is necessary not only to apply varnishes, but also to coat varnishes on both sides when necessary, and it is also necessary to select a good quality lacquer.

2. Whether the cutting edge of the die-cutting tool is sharp, whether there is wear, passivation, or capping adhesion is also very important.

Die cutting tool will produce natural wear after using for a period of time. Normally, it needs to use whetstone to polish the cutting edge for every 3 million to 5 million times of die cutting; for die cutting more than 10 times, it needs to grind tool angle and edge with grinding wheel. mouth. If there is an obedient idea in the touch cutting process, the tool is blunt and continues to be used, and the cut-out aluminum foil cap label product will certainly have a flanging adhesion. To ensure the quality of die-cutting, it is necessary to maintain the cutting edge of the die-cutting tool sharply. This is the reason why the so-called sharpening knife does not mistakenly cut the firewood.

3.After using the cutting table for a period of time, due to the repeated impact of the die cutting tool, the cutting table will be too wide and the sipe will be too deep. Therefore, the aluminum cap will be formed under the surrounding conditions. Turning sticking phenomenon. Therefore, the die table's work surface should be replaced in time after being used for a period of time. In order to reduce the production cost, a 5mm-thick plexiglass plate is used on the worktable, and a 5mm thick rubber plate is adhered to the worktable. Adhesion can be used double-sided tape, save time, save labor, save money, but also easy to replace.

4. The spring strength used on the die-cutting tool is not enough, or the quality of the spring is not enough. After repeated compression for a period of time, the strong elasticity will be lost, resulting in insufficient pressure around the tool during die cutting. Can not cut the pile of aluminum foil, causing flanging adhesions. Therefore, the strength and resilience of the spring selected by the die-cutting tool are the key to ensure the die-cut quality of the aluminum foil cap. I suggest that it is better to increase the internal pressure plate by touching the cutting tool, and press the aluminum foil together inside and outside, cutting in the middle floor. In this way, when the die is cut, the inside and outside of the aluminum foil cap are pressed, and the die-cutting quality is easily controlled.

5. When layout, if you want to save raw materials, the die-cut margin will be too little. In the die-cutting process, die-cutting will cause the surrounding downturn to stick due to the fact that the die-cut will not hold down the cut-down aluminum foil. There will be imperfections between the finished product and the waste. Therefore, there must be a reasonable margin for typesetting. Generally, in the case that the inner blade of the cutter is not installed, a margin of 8 to 10 mm is to be left. If a cutter to increase the inner pressure is used, the margin of 6 to 8 mm can be generally reserved.