1235 Aluminum Foil Factory In China
The viscosity of double zero aluminum foil has two meanings: the mechanical properties of the aluminum foil do not meet the requirements of use, and the poor degreasing effect on the surface of the aluminum foil will cause difficulties in the use of the aluminum foil. The amount of oil and its physical and chemical properties can be adjusted to adjust the tension usage parameters of the roller and the slitting machine, thereby eliminating the stickiness of the aluminum foil. According to the production status, aluminum foil has two types: soft and hard. After softening and repeating, double zero foil is mostly used. Continuous softening is to control the mechanical properties of the aluminum foil and eliminate residual oil on the surface of the aluminum foil to obtain a smooth and shiny surface. Free to expand. Different aluminum foils require different degrees of degreasing. For example, the surface of composite aluminum foil and capacitor aluminum foil must be free of residual lubricating oil. However, only users have put forward higher and higher requirements for the quality of the double zero foil. The stickiness of aluminum foil has become one of the main drawbacks. The adhesion phenomenon of the double zero foil in a soft state is mainly manifested as: the touch of the double zero foil is "soft", and it is inconvenient for the user to maintain a flat shape during use. The double zero foil roll and layer are difficult to peel off during the uncoiling process, which makes the aluminum foil unable to be used normally.
Solutions to the sticky problem of double zero aluminum foil:
1. Annealing process improvement
1.1 The principle of the gradual recovery system of double zero tin foil products. Usually, the purpose of double zero tin foil replacement is to obtain a certain degree of plasticity; the other is to obtain a bright, clean and oil-free surface quality. Since the recrystallization temperature of pure aluminum foil is about 240~260°C, and the distillation range of aluminum foil rolling oil is generally about 200~260°C, in the alternative process prepared in the past, the gradual temperature is generally 300~400°C, and the continuous cycle is 10~40h. In this alternate system, due to the high temperature, the oil is burned, and the carbon chain of the oil film is decomposed and oxidized, which causes pollution of the aluminum foil and causes yellow-brown oil spots.
1.2 The shortcomings of the previous double-zero foil finish annealing process. In recent years, the so-called low-temperature continuous repetition process has been gradually adopted. The repetition temperature is not less than 280℃ and the continuous time can reach 150h. However, the effect of double-zero foil annealing is not ideal. . Does the annealing temperature of double zero foil have to be higher than the recrystallization temperature of pure aluminum foil? If the continuous operation is lower than the recrystallization temperature, can it meet the user's requirements? What is the degreasing effect at low temperature? How to master the temperature and time step by step to ensure that the mechanical properties and surface quality meet the requirements is a question that must be answered through experiments.
1.3 The formulation of the new step-by-step process is based on the main parameter of the continuous process is the repetition time, which mainly lies in the amount of furnace installed, the width and diameter of the foil roll. The furnace load is large, the coil diameter deviates, and the wider the foil, the longer the gradual time. It should be ensured that the degreasing effect is reduced, and the temperature should be gradually reduced as low as possible, regardless of whether the aluminum foil is fully recrystallized.
1.4 The application effect of the new nitrate process The annealing test of aluminum foil was carried out in a circulating air furnace. Taking into account the elimination of the edge drum defect of aluminum foil rolls, slow heating and slow cooling are required, and a stepped heating system is adopted. According to the aluminum foil coil diameter and aluminum foil length to test the annealing holding time; according to different repeated temperature to check the mechanical properties of the aluminum foil, the orientation of the aluminum foil and the degreasing performance of the aluminum foil. The annealing test is combined with industrial production to replace a 10t box-type circulating air furnace with a heating power of 360kW and a maximum heating temperature of 535°C. The alloy state of the test aluminum foil is 1235-O, the thickness is 0.006~0.007mm, the coil diameter is 300~500mm, and the width is respectively 350, 460, 520, 787, 920, 1024, 1216mm. The repeat time is based on the specifications of the test aluminum foil (heating + Heat preservation + cooling) is 30~150h, and the annealing temperature is 180~300℃. The tensile testing equipment is ZLD-10 electronic tensile testing machine. Table 1 Comparison of aluminum foil annealing test results. Temperature/°Cσb/MPaδ/% Degreasing uncoiling characteristics 280~250 41~69 0.5~1.0 A-grade easy adhesion 240 73~89 0.5~1.0 A-grade L≤200mm230 76~91 0.5~1.0 Class A L≤200mm220 87~98 1.0 Class B.
Jumbo Roll Aluminium Foil Suppliers In the previous article, I also talked about the various uses of aluminum foil. If you are interested, you can click on the link to view the details.
