Pcb drilling wooden pad high density standard? The cover plate and pad plate for printed circuit board (referred to as cover/pad plate) are important auxiliary materials for PCB Mechanical drilling.Due to the need for a large number of cover plates in the production of PCB Mechanical drilling,And in recent years, with the rapid development of PCB drilling technology,The PCB cover plate industry has become an important part of a considerable scale in the PCB raw and auxiliary materials industry.1.PCB cover pad was born almost simultaneously with PCB in the 40 or 50 s of the last century.The first use of the resin cover,And ordinary phenol resin Tg is low,There are gradually problems such as drilling pollution.For this reason,Once in the PCB industry, epoxy glass fiber boards were used,But it can't completely solve the problem of drilling,And because the drilling speed is getting higher and higher,More and more heat is generated,In the late 1980s S, the cover plate was required to
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Wood floor chicken wing Wood and oak which is better ?? Is the strengthening plate chemical synthesis ?? The real chicken wing Wood belongs to mahogany,No one is willing to make floors,If it's oak floor,That's quite good.The reinforced wood floor has a structure like a sandwich,It is divided into four layers: wear-resistant layer, decorative layer, substrate layer and moisture-proof layer.The wear-resistant layer is the top transparent layer,The raw material of the red sapphire body,Name of aluminum oxide (alumina ).Decorative layer,That is, the floor surface seen by the naked eye is cordial and realistic wood grain decoration layer.Base layer also known as layer,Crushed by natural or artificial fast-growing forest wood,High temperature and high pressure molding by fiber structure reorganization.Divided into high density board, medium density board, particle board.Moisture-proof layer is floor back surface.Using polymer resin material,Glued to the bottom of the substrate,Play the role of stability and moist