The causes of the open circuit in PCB manufacturing and the improvement methods

Why is PCB circuit going to open? How to improve?

PCB open circuit, short circuit is the PCB manufacturers almost every day will encounter problem, has been plagued by production, quality management personnel. I have accumulated some experience for the improvement of PCB open and short circuit problem. For discussion by peers in PCB manufacturing.

First of all, we classify the reason summary as the following

i, The open circuit caused by the base material exposed

1,There is a scratch on the copper clad laminate before entering the storehouse

2, CCL is scratched in the process of opening the material

3, The copper clad laminate is scratched by the drill nozzle when drilling

4, CCL is scratched in the course of transshipment

5, Stacking board after the deposition of copper due to improper operation caused the surface of copper foil was hurt

6, The surface of copper foil is scratched through the horizontal machine

Improvement methods

1, CCL before entering the storehouse IQC must carry on the sampling inspection, examines whether the CCL surface has the scratch to expose the base material phenomenon　

2, The phenomenon that the copper clad laminate and the edge tool friction cause the foil scratch. Therefore, it is necessary to clean the table carefully before the material is opened to ensure smooth surface without hard quality utensils exist

3, Copper clad laminate scratched by drill tip during drilling

　a, To replace the clamp Tsui according to the wear degree of the clamp Tsui

　b, Regular cleaning of pinch Tsui according to operating rules to ensure no sundries in the clamp Tsui

4, The board is scratched during the transit process:

   a, The handling personnel improper operation, causes the board angle and the board surface friction and scratches the board surface

   b, To push the board because being not neatly laid, causes the friction between board and board lead to scratch the board surface

5, After copper immersion, after electroplating, the stacking board was scratched as a result of improper operation　　

6, The surface of copper foil is scratched through the horizontal machine

a, The edge of the baffle of the grinding machine is generally uneven and there is a sharp object raised , the board surface is scratched when the board is passed

b, Stainless Steel propeller shaft, to be damaged into a pointed object, scratch the copper surface and expose the base material while the board going through