In the digital information age, the storage medium has developed from paper carrier to a variety of new carrier storage media, such as hard disk, flash memory, U disk, SD card and so on. In order to manufacture portable and large capacity data storage products, the equipment and technology depend on the pollution control and filtration purification technology of each process. Hangzhou Dali develops and produces all kinds of advanced filtration products and related technologies to meet customers' personalized process and demand.