Welcome light in the visible surface of aluminum foil irregular holes called pinholes. With reduced thickness, increased number of pinholes is one of the major flaws foil.
Blank, the upper roll, rolling oil, dust in the air and even reach into the roll gap 6μm size will cause pinholes, so 65m aluminum foil pinholes is impossible, only the number and size of the evaluation it.
With the improvement of the level of installed equipment foil, aluminum foil rolling conditions can be improved, especially to set an effective dust and rolling oil filter and quick roll change system, so the number and size of pinholes Aluminum increasingly dependent on blank metallurgical quality and processing defects.
Because pinhole defects often blank off, it is difficult to find the correspondence between the original defects. Generally it believed that the pinhole mainly containing gas, mixed, compound and segregation related.
Take effective molten aluminum purification, filtration, etc. to help reduce grain refinement pinholes.
A means of improving the use of alloying material hardening properties also help reduce pinholes. Shoot high-quality billet aluminum foil rolling 6μm pinhole in 100 / m² or less. Aluminum foil rolling process, other factors causing pinholes are many, even catastrophic, thousands of pinholes per square meter is not unusual. Strengthen the rolling oil filter.
Roll short-term replacement and dust control measures are necessary to reduce the aluminum foil pinholes conditions; with large rolling force small tension rolling will help to reduce pinholes.
