Zhenjiang Preferred Rolling Copper Foil Manufacturer
The commonly used reinforcement materials of copper clad laminate are alkali free (alkali metal oxide content shall not exceed 0.5%) glass fiber products (such as glass cloth, glass felt) or paper (such as wood pulp paper, bleached wood pulp paper, cotton wool paper). Therefore, laminates can be divided into glass cloth base and paper base.
Zhenjiang Preferred Rolling Copper Foil Manufacturer
During the production of copper foil, tiny foreign matters are adhered on the surface to form spots with different colors from the surface, which are called stains. Judgment method: use macroscopic inspection to judge whether it is a waste product, a secondary product or a finished product according to the number and area of stains and the impact on product quality.
Zhenjiang Preferred Rolling Copper Foil Manufacturer
Galvanizing barrier layer: After the rough surface is galvanized, a barrier layer is formed to improve the oxidation resistance of the copper foil in natural air. After galvanizing, the appearance will look gray. After a period of storage, the gray will turn into copper yellow. The more zinc is plated, the more yellow the copper foil will be.
Zhenjiang Preferred Rolling Copper Foil Manufacturer
Small dirt, small exclamation mark. During the production of raw foil, the hair side is upward, and the dirt in liquid and air all fall on the hair side, which is printed on the smooth side after rolling. The reason is that the stains on the cathode roll are not dried. The surface temperature of the cathode roll is only 50 degrees, and the air temperature in the workshop is generally about 25 degrees. The surface hairiness is very good. The dirt itself has water, and the drying time is only 2-3 minutes. Therefore, the dirt on the copper foil cannot be completely dried.
