Drilling liner plate of circuit board

Abstract

The invention relates to a drilling liner plate of a circuit board, in particular to a drilling liner plate of a circuit board with a coating containing a resin mixed nano-inorganic material and a micrometer inorganic material. The drilling liner plate of the circuit board comprises a density fiberboard; and a functional coating is coated on at least one surface of the density fiberboard and contains resin and the nono-grade inorganic material or the micro-grade inorganic material or contains a nano-grade and micro-grade mixer material, a single component or multiple components. Under the condition that the drilling diameter of the circuit board is reduced and by improving the surface hardness of the liner plate, the invention effectively prevents concaves and convex parts and burrs whichare generated by hole edges of the circuit board after drilling and simultaneously reduces the temperature of a drill point and a drill bit during drilling, prolongs the service life of the drill point and meets the requirement of environmental protection.

Description

Technical field: [0001] The invention relates to a circuit board drilling backing plate, in particular to a circuit board drilling backing plate coated with resin mixed nanometer inorganic material and micron inorganic material. Background technique: [0002] At present, the drilling backing board of the circuit board is mainly medium and high-density fiberboard, and the main production process of the density fiberboard is: wood crushing-dehydration-mixing-lamination-sanding. The main purpose is to improve the strength and surface hardness, so as to eliminate and reduce the burr on the edge of the hole when the drill bit penetrates the workpiece. The aluminum alloy cover plate on the workpiece is to eliminate and reduce the burr on the edge of the hole when the drill enters the workpiece glitch, figure 1 shown. [0003] At present, the types of existing circuit board drilling pads mainly include the following types: [0004] [0005] With the development of technology,...

AI Technical Summary

Problems solved by technology

When the diameter of the drilled hole is reduced to less than 0.25mm, the mechanical force on the edge of the hole will increase, and the hardness of the backing plate for the drilled hole cannot be effectively reduced and the roughness and burrs on the edge of the hole formed by the drilled hole will not be effectively reduced.

The increase in drill speed and the increase in drilling speed lead to a large amount of heat generated by friction, and the temperature of the drill increases accordingly. The increase in the temperature of the drill reduces the service life of the drill

[0006] Traditional medium density fiberboard and high density fiberboard can no longer meet the quality requirements of drilling

The surface hardness is relatively low, and because it is composed of wood fibers, the thermal conductivity is also small, resulting in a reduction in the service life of the drill

[0007] Although the hardness of the resin-coated high-density fiberboard has been improved, it cannot reach the hardness of the melamine paper-coated density fiberboard and phenolic cardboard, which has a certain impact on the drilling quality

Due to the use of resin coating, the heat dissipation capacity is not improved, which affects the service life of the drill

[0008] Although the surface hardness of melamine paper-coated density fiberboard and phenolic paperboard is very high, it mainly has the following disadvantages: 1. Since the surface and the main body are organic matter and wood fiber, the heat dissipation performance is not good, which affects the life of the drill.

2. During the production process, melamine-faced density fiberboard and phenolic paperboard require high-temperature and high-pressure processes, which consume a lot of energy and lead to high production costs.

4. Due to the high temperature and high pressure process, it is easy to cause the bending of the plate, which cannot meet the flatness required by the drilling process

5. Melamine is a toxic material. Formaldehyde is required in the production of phenolic cardboard, which is harmful to the human body and the environment. From the perspective of environmental protection, it is an undesirable material

[0009] In summary, the current drilling backing plate cannot meet the following drilling process requirements at the same time: 1. High surface hardness; 2. Good heat dissipation performance; 3. Good flatness; 4. Low cost; 5. Environmentally friendly Require

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