PCB screen printing technology has many specifications, which can not be done casually. These specifications have promoted the development of PCB screen printing technology. Let’s take a look at the specifications.
All components, mounting holes, and positioning holes have corresponding silk-screen marks. In order to facilitate the installation of the board, all components, mounting holes, and positioning holes have corresponding silk-screen marks. The mounting holes on the PCB use H1, H2… …Hn for identification.
Silk-screen characters follow the principle of left-to-right and bottom-up. Silk-screen characters should follow the principle of left-to-right and bottom-up as far as possible. For devices with polarities such as electrolytic capacitors and diodes, try to keep the same direction in each functional unit.
There is no silkscreen on the device pad and the tin track that needs to be tinned, and the device position number should not be blocked by the device after installation. (Except for high-density PCBs that do not require silk screen printing).
In order to ensure the reliability of the soldering of the device, it is required that there is no silkscreen on the device pad. In order to ensure the continuity of the tin channel, it is required that there is no silkscreen on the tin channel. The device is blocked after installation. The silkscreen should not be pressed on the vias and pads, so as not to cause part of the silkscreen to be lost when the solder mask is opened, which will affect the training. The silkscreen spacing is greater than 5mil.
The polarity of polarized components is clearly indicated on the silkscreen, and the polarity direction mark is easy to identify.
The number of PCB light drawing files is correct, each layer should have the correct output, and there should be a complete output of the number of layers.
The identifier of the device on the PCB must be consistent with the identification symbol in the BOM list.
The direction of the directional connector is clearly indicated on the silkscreen.
There should be a bar code position mark on the PCB. When the PCB board space permits, there should be a 42*6 bar code silkscreen frame on the PCB. The position of the bar code should be considered for easy scanning.
PCB board name, date, version number and other information silk screen position of the finished board should be clear. The PCB file should be printed with the board name, date, version number and other information of the finished board, and the position is clear and eye-catching.
There must be completely relevant information of the manufacturer and anti-static signs on the PCB.
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