Aluminium Foil Jumbo Roll Suppliers
How to prevent aluminum foil from wrinkling
Due to the serious poor shape of the aluminum foil, wrinkles are formed when the aluminum foil is rolled or unrolled. The essence is that the tension is not enough to make the box surface level. For a device with a tension of 20 MPa, the plate shape of the box surface should not be greater than 301. When it is greater than 301, it will inevitably wrinkle. Since the aluminum box is often subjected to a tension greater than that of the subsequent processing size during rolling, some aluminum foils that only exhibit poor plate shape during rolling exhibit wrinkles when used after slitting or annealing. The cause of wrinkles is due to poor shape control, including incorrect roll grinding, unreasonable roll shape control, unreasonable control of rolling and slitting process parameters, poor sheet shape and incorrect adjustment of the shape of the sleeve, Or the die precision is not enough. , Said wrinkles. The main causes of wrinkles: excessive reduction, resulting in uneven deformation during rolling or insufficient tension during coiling; improper roll shape control or low rolling pressure; uneven billet thickness, poor plate shape or transverse waves; The precision of the winding shaft is not enough, the sleeve is not round; the pressure of the flattening roller is not properly controlled.
How to distinguish the quality of aluminum foil
(1) Pinhole. Pinholes are the main defect of aluminum foil. Among the raw materials, the size of dust on the roll, the rolling oil, and even the dust in the air reaching about 6μm into the roll gap will cause pinholes. Therefore, it is impossible for 6μm aluminum foil to have no pinholes. It can only be evaluated by the number and size. Of course, the use of alloying and other means to improve the hardening characteristics of the material can also help reduce pinholes. The pinholes of 6μm aluminum foil rolled by high-quality hot-rolled material can be less than 100/㎡. When the cast-rolled material is well purified, 6μm aluminum foil pinholes are less than 200/㎡.
(2) Uneven roll print, roll eye, and gloss. It is mainly the aluminum foil defect caused by the roll, which is divided into three types: point, line and surface. The most significant feature appears in three cycles. The main reasons for this kind of defect are: incorrect grinding of the roll; foreign matter damages the roll: the roll is damaged by the defect of the incoming material; the roll is fatigued; the impact and slippage between the rolls. All the factors that can cause damage to the surface of the roll can cause harm to the aluminum foil rolling. Because the surface finish of aluminum foil rolling roll is very high, slight uneven gloss will also affect its surface condition.
(3) Wrinkles. Due to the serious bad shape of the aluminum foil, wrinkles are formed when the aluminum foil is rolled or unrolled. The essence is that the tension is not enough to make the foil surface flat.
(4) Bright spots, bright marks and bright spots. The bright spots, bright marks and bright spots on the double surface caused by improper use of double oil are mainly due to insufficient double oil film strength, or uneven rolling surface deformation caused by uneven roll surface, and the appearance is hemp skin or foreign matter intrusion. . Selecting a reasonable double oil, keeping the incoming material clean and the roll surface uniform are effective measures to solve this type of defect.
(5) Thickness difference. The difficulty of controlling the thickness difference is a characteristic of aluminum foil rolling. The thickness difference of 3% may not be difficult in the production of plates, but it is very difficult in the production of aluminum foil. The reason is that the thickness is thin, and other trace conditions can affect it, such as temperature, oil film, and oil and gas concentration. A roll of aluminum foil can be rolled up to hundreds of thousands of meters, and the rolling time is as long as about 10 hours. With time, the thickness difference is easy to form, and the only way to adjust the thickness is the tension speed. These factors have caused the difficulty of thickness control in aluminum foil rolling. Therefore, the real control of the thickness difference within 3% requires many conditions to ensure that it is quite difficult.
Pharmaceutical Aluminum Foil Price In the past few years, as medical device manufacturers seek innovative methods of packaging, sterilizing and selling products, the use of non-porous materials in packaging has become more and more popular. Similar to porous packaging, there are many options for non-porous packaging, such as blister packaging, all foils, all polymers (poly), and combinations of foil and poly.
