Aluminum foil post-processing is an important part of an enterprise, which is related to the yield and profit point of an aluminum enterprise. The higher the yield is, the greater the profit point is. Of course, the finished product rate should be controlled in every link, standardized operation, and also requires sophisticated equipment and responsible leadership and staff. I don't know the equipment and operation specifications. I dare not point my finger at them. I can only analyze them on the cutting knife according to practice. Next, I'll talk about why slicing happens, such as edge warping, multilateral and powder dropping. The problems of edge warping, multilateral and powder dropping are mostly related to blades, except for the data itself and equipment problems.
Usually there are two kinds of blades for cutting aluminium foil. One is round blade, the other is blade blade, also known as razor. The razor blade is fixed at a point, and is forced to cut and cut with data winding. Aluminum foil is cut automatically. The faster the speed, the smaller the resistance of the blade. The slower it is, the opposite is true. The thickness of the blade corresponds to the resistance. The thicker the blade, the greater the resistance. Thinner is the opposite. Because the razor blade is cut and fixed, when the blade touches foil and thin data, the cutting point simply presents fatigue and fever, so after a period of time, the blade will not be sharp, the knife will be blunt, showing tearing phenomenon, showing that the powdered edge is unavoidable. Of course, these are also related to the sharding perspective. Choosing a good razor blade is the first choice to deal with these problems. Ceramic blade should be the first choice.
Now all aluminium foil enterprises want to process high value-added battery foil, but the acceptance criteria for battery foil can be rigorous. Among the representative lithium battery enterprises, such as BYD, ATL and A123, the acceptance criteria for aluminium foil are rigorous. The requirement for foil is very high, and the width, dust and edge warping are also rigorous. So for battery foil enterprises with low output value, post-processing points
[Differentiation between ceramic and steel blade] In high-speed cutting, the heat dissipation coefficient of steel blade is poor. The higher the cutting speed, the greater the friction coefficient, the more heat generated, and the more heat retained in the steel blade. During the cutting process, the friction between foil and blade will generate heat. Some of the heat dissipates with the winding at room temperature, while the other part of the heat remains on the steel blade and is the accumulated heat. The longer the cutting time and the higher the speed, the more heat left on the blade. In this way, the blade transfers heat to the foil, which forms heat transfer to the foil. Because the blade has high temperature and then touches the foil, dust sticks to the blade, which makes the blade sharpen and form the condition of powder dropping and edge warping. At the same time, the blade will lose its original hardness, durability and sharpness, resulting in powder loss, lotus edge and so on. Cutting rate is very important.
[Two kinds of cutting methods of aluminium foil round blade] Round blade cutting is part of automatic cutting of aluminium foil, that is, round blade is rotated by foil data winding, the same method as razor blade, only more edges and data touch. This method is forced by the blade itself and affected by the speed of data. Touch points and knife edges are downward pressing methods. Data winding is jumpy, because the blade itself has no power, the winding shake easily out of the warp edge.
Round knife automatic cutting, this is the most common method now. There are two kinds of automatic cutter slitting, one is coaxial rolling, the other is driven by one-arm motor. Individuals prefer one-arm drive, which can adjust blade speed according to different data thickness. Round knife is usually cut with top and bottom knives, but what we usually see is Butterfly Top knife. Why should we use Butterfly Top knife? This is from Japan and Korea, because parallelism is not good, butterfly blade can compensate for this lack, we usually have to press the butterfly top knife on the lower knife, is afraid that parallelism is not good, can not cut good products. This point, please note: Germans do not need butterfly bowl blades. Their blades are all flat, because their parallelism error is less than 0.5 um. But usually the thickness of the cutting blade in Germany is more than 2 mm. The thinner the blade, the more difficult it is to control the parallelism tolerance. However, the thicker the thickness is, the greater the resistance is, and the simpler the situation of warping, indentation and powder dropping is. Individuals prefer thin blades, thinking that the thinner the blade, the more cut out.