Hard stone-plastic backing plate for PCB drilling and preparation method thereof

Abstract

The invention discloses a hard stone-plastic backing plate for PCB drilling and a preparation method thereof. The preparation method comprises the following steps: (1) weighing 10-30% by weight of thermoplastic plastic, 60-85% by weight of mineral powder and 5-11% by weight of an assistant, and performing mixing; (2) extruding the mixed raw materials at 160-180DEG C by adopting a PVC plate extrusion production line; and (3) adjusting the thickness between 1mm and 5mm as required, conducting rolling and forming, cooling, and cutting into the required specification, thereby obtaining the hard stone-plastic backing plate for PCB drilling. The product disclosed by the invention is very good in flatness, does not deform or warp and is not influenced by weather, and the shore hardness can be randomly adjusted between 70 degrees and 100 degrees. Various requirements of PCB drilling on the backing plate can be met; and the defects that the drilling quality is influenced and a drill bit is not favorably protected due to the conditions of sand marks, concave-convex parts, scratches, warping deformation, insufficient hardness and the like of the wood fiber backing plate are avoided. And meanwhile, after drilling is used, waste can be recycled, no garbage is generated, and environmental protection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of PCB boards, and in particular relates to a hard stone-plastic backing board for PCB drilling and a preparation method thereof. Background technique [0002] In the PCB board manufacturing process, it is generally necessary to drill several holes with different apertures on the PCB board for component insertion or conduction. Drilling pads are generally used as important auxiliary materials when drilling PCB boards to improve the quality of drilling. Most of the existing backing boards use wood fiber boards or wood fiber boards after veneering. These two types of backing boards have the following disadvantages: 1) The flatness of the board surface is not enough, even if the wood fiber backing board with UV paint or melamine decoration is used, There will also be defects such as bumps, scratches, and residues that affect drilling and are not conducive to protecting the needle. 2) The hardness of the board...

AI Technical Summary

Problems solved by technology

Most of the existing backing boards use wood fiberboard or wood fiberboard after veneering. These two types of backing boards have the following disadvantages: 1) The flatness of the board surface is not enough, even if the wood fiber backing board with UV paint or melamine decoration is used, There will also be bumps, scratches, residues, etc. that affect the drilling and are not conducive to the protection of the needle.

2) The hardness of the board surface does not meet the requirements, and it is easy to cover the peak when drilling, which is not conducive to protecting the drill bit

3) It is very easy to be damp and deformed, and the warpage is large, which affects the drilling quality

4) The thickness deviation is large, and it is easy to deviate the hole, burn the hole and wear the drill bit

5) From the perspective of environmental protection, this kind of board is completely made of wood, and it is a one-time use. It needs to cut down a lot of trees and waste a lot of forest resources.

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