Issued July 1, 2001 - ThreeBond（2001年7月1日发布ThreeBond）.pdf

Three Bond Technical News Issued July 1, 2001 57 Development of Sealants and Adhesives for HDDs Introduction ________________________________________________ Hard-disk drives (HDDs) have played an essential role in recent progress in information technology and digitalization. More than 200 million hard disks are produced each year as storage devices for both personal and mainframe computers. These hard disks offer high capacity, high-speed access, and cost-effective performance. Three Bond develops anaerobic sealants, epoxy resins, ultraviolet-curing resins, and conductive resins that have low-outgas characteristics, and they are used as sealants and adhesives in current HDDs. This issue introduces technologies to produce low-outgas sealant and adhesive, their capabilities, and methods to measure outgas. HDD is a sealed storage device. Therefore, if any corrosive, volatile gases are generated inside the device, it may impact device performances. HDDs are magnetic storage devices that incorporate magnetic heads to record signals to a recording film (or medium) deposited upon on smooth aluminum or glass disks rotating at some 5,000 to 10,000 revolutions per minute. Clearance between the head and the surface of the medium is on the order of several tens of nanometers. Therefore, any foreign objects adhere between the head and the disk may cause a major damage. For this reason, major imperatives in HDD development are to protect the devices from penetration of small dust and humidity, and reduce the generation of volatile gasses from parts and