What causes the pinholes of the aluminum foil?
Aluminum foil rolling process, other factors causing pinholes are many, even catastrophic, thousands of pinholes per square meter is not unusual. Effective filtration rolling oil, roll and replace short-term dust control measures are necessary to reduce the aluminum foil pinhole conditions, and the use of large rolling force, rolling little tension will also help reduce pinholes.
Generally believed that the main pinhole and gas content, inclusion, segregation and related compounds. Take effective molten aluminum purification, filtration, helps to reduce grain refinement are pinholes. Of course, using other means to improve the alloying material hardening properties also help reduce pinholes. High-quality hot-rolled aluminum foil rolling 6μm pinhole in 100 / m or less. When the casting material when better purification, 6μm foil pinholes 200 / m or less.
Due to improved foil rolling conditions, particularly dust and rolling oil effectively filter and convenient roll changing system settings, the number of aluminum foil pinhole increasingly dependent on the metallurgical quality of the raw material and processing defects due to pinholes often defects in materials shedding, it is difficult to find the correspondence between the original defects.
Pinhole is the major drawback of aluminum foil. Raw material, the upper roll, rolling oil, even to the dust in the air is about the size of 6μm enter the roll gap will cause pinholes, so 6μm foil pinholes is impossible, only the number and size of its evaluation.
