Wafer sheet, corresponding production plate and method of use

摘要

A wafer has a plane core part (102) and an array of hollowed formations (104) projecting for a given height with respect to the core part (102). The wafer also has a further array of formations (106) set between said hollowed formations (104) and projecting from the aforesaid core part (102) for a height (h) smaller than the height of the hollowed formations (104). The invention also relates to a plate that can be used for making said wafer, as well as a corresponding method of use.