Los principales defectos del rollo jumbo de papel de aluminio son:
Feb 10, 2022
Los principales defectos del rollo jumbo de papel de aluminio son:
(1) Pinhole. Pinholes are the main defect of aluminium foil jumbo roll. In the raw material, on the roll, in the rolling oil, and even the dust in the air reaches about 6μm and enters the roll gap, it will cause pinholes. Therefore, it is impossible for 6μm aluminium foil jumbo roll to have no pinholes. It can only be evaluated by how much and its size. Due to the improvement of aluminium foil jumbo roll rolling conditions, especially the effective filtration of dust and rolling oil and the setting of convenient roll changing system, the number of pinholes in aluminium foil jumbo roll is more and more dependent on the metallurgical quality of raw materials and processing defects. It is difficult to find the corresponding relationship with the original defect when the defect of the raw material falls off. It is generally believed that pinholes are mainly related to gas content, inclusions, compounds and composition segregation. Effective aluminum liquid purification, filtration, and grain refinement can help reduce pinholes. Of course, the use of alloying and other means to improve the hardening characteristics of the material also helps to reduce pinholes. The pinholes of 6μm aluminium foil jumbo roll rolled from high-quality hot-rolled materials can be less than 100/㎡. When the casting and rolling materials are well purified, the pinholes of 6μm aluminium foil jumbo roll are below 200/㎡. In the aluminium foil jumbo roll rolling process, there are many other factors that cause pinholes, even catastrophic, and thousands of pinholes per square meter are not uncommon. Effective filtration of rolling oil, short-term replacement of rolls and dust-proof measures are all necessary conditions to reduce pinholes in aluminium foil jumbo roll, and the use of large rolling force and small tension rolling will also help to reduce pinholes.
(2) Marca rodante, ojo rodante, brillo desigual. Es principalmente el defecto del rollo jumbo de papel de aluminio causado por el rollo, que se divide en tres tipos: punto, línea y superficie. La característica más notable aparece en tres ciclos. Las principales causas de este defecto son: rectificado incorrecto de los rodillos; daño a los rollos por objetos extraños: defectos entrantes que imprimen los rollos; fatiga por balanceo; impacto entre rollos, deslizamiento, etc. Todos los factores que pueden causar daño a la superficie del rollo pueden causar daño al rodamiento del rollo jumbo de papel de aluminio. Debido a que el acabado de la superficie del rollo jumbo de papel de aluminio es muy alto, el brillo levemente irregular también afectará la condición de la superficie. La limpieza regular del tren de laminación, mantener limpio el tren de laminación, garantizar el funcionamiento normal del limpiador de rodillos, el cambio regular de rodillos y la molienda razonable son las condiciones básicas para garantizar la superficie uniforme del rollo jumbo de papel de aluminio después del laminado.
