BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup board for drilling having a hard surface and a soft inner core layer,

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a drill backing board (hole processing base plate) used in a drilling process (hole lifting process), which is one of important processes in the process of manufacturing a printed circuit board. The backup board of the present invention is manufactured by thermally curing a prepreg prepared by impregnating phenolic-modified melamine-based water on both surfaces of a soft material such as MDF (Medium Density Fiber) under different conditions at high temperature and high pressure.;Since the drill backing board manufactured in this manner has a hard surface and a soft inner layer, it is possible to reduce the occurrence of burr due to the copper during the drilling process and to easily remove the drill powder from the hole . In addition, the soft inner layer reduces the wear of the drill bit and the heat generated during drilling, as well as reducing the burr burden of the drill bit. As a result of the operation and effect of the present invention, a higher quality hole is processed more economically than that provided by the prior art.;Therefore, the product of the present invention having economic and quality characteristics can replace almost all kinds of backup drill boards currently being produced, such as drill boards used for small-scale production and large-scale production, and drill boards used for special products There will be.