A backing plate for PCB drilling and preparation method thereof

Abstract

The invention discloses a backing plate used for PCB drilling. The backing plate comprises a wood fiber base board, a gum impregnated fiber paper lubricating layer adhered to the upper surface of thebase board and a gum impregnated fiber paper reinforcing layer adhered to the lower surface of the base board. The lubricating layer has certain hardness and good functions of lubrication and thermalconductivity, so that flash problems at hole outlets of circuit board drilling can be effectively inhibited; the fiber paper is used as a base material, so that the smoothness and compactness of the resin layer are improved, and the processing performance of drill holes is improved; the reinforcing layer is prepared after the fiber paper formed by papermaking of raw materials such as aramid fibers, basalt fibers, and sisal fibers is impregnated with a resin gum, and the reinforcing layer has a smooth surface and good effects of buffering and thermal insulation, and plays a role of protecting adrilling bit and a table surface; and in a forming process, the upper and lower surface layers of the backing plate are firstly made into semi-solidified states, then the semi-solidified upper and lower surface layers and the base material are subjected to hot press molding, and no additional adhesives are added to the surface layers and the base material, so that adverse influences on drilling by the adhesives are effectively prevented, and the drilling accuracy is improved.

Description

Technical field [0001] The invention relates to the technical field of PCB drilling pads, in particular to a PCB drilling pad and a preparation method thereof. Background technique [0002] In the process of pcb drilling, the backing plate is an indispensable auxiliary material. Its function is to prevent the bottom of the pcb from flaring, improve the drilling accuracy, and protect the surface of the drilling rig. Commonly used backing boards are ordinary paper backing boards, high-density paper backing boards, phenolic backing boards, epoxy resin boards and so on. As pcb gradually develops towards multi-layered, functionalized, laminated, integrated and light, thin, short, and miniaturized, drilling technology is gradually becoming more microporous, high-precision, and high-quality. The comprehensive performance of the board puts forward higher requirements, especially the higher and higher functional requirements for the backing board. The traditional backing board with a sin...

AI Technical Summary

Problems solved by technology

With the gradual development of pcb towards multi-layer, functional, laminated, integrated and light, thin, short, and miniaturized, the drilling technology is gradually micro-holed, high-precision, and high-quality. The overall performance of the board puts forward higher requirements, especially the increasing functional requirements for the backing board. The traditional backing board with single performance obviously cannot meet the production needs.