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Green oil silk-printing method for printed circuit board

A printed circuit board and silk screen printing technology, applied in printing, printing devices, etc., can solve problems such as green oil easily entering holes, affecting product performance and appearance, tin beads, etc., to prevent tin rings and tin beads hidden in holes , good electrical performance and appearance, the effect of good electrical performance and appearance

Active Publication Date: 2012-11-28
KALEX MULTI LAYER CIRCUIT BOARD (ZHONGSHAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, green oil is easy to enter holes or even plug holes during the silk screen printing process of PCB, especially small holes, which are prone to bad defects such as dirty development, red lines, film printing, side erosion of development, etc., and it is easy to cause tin bead problems during installation.
According to the traditional screen printing method, it is difficult to ensure that the green oil is completely coated evenly and the green oil does not seal the hole during the silk screen printing process of the small hole with a drilling diameter of less than 0.4mm. Therefore, the above-mentioned quality defects are prone to occur, which seriously affects the quality of the product. performance and appearance

Method used

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  • Green oil silk-printing method for printed circuit board
  • Green oil silk-printing method for printed circuit board
  • Green oil silk-printing method for printed circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The green oil screen printing method of embodiment 1PCB

[0020] see Figure 1-3 As shown, a PCB circuit board green oil silk screen printing process aimed at small holes with green oil to cover oil and not plug holes, it includes the following processes: pre-treatment, silk screen, pre-baked board, exposure, development, post-curing, wherein the silk screen step Among them, the control parameters are: screen printing pressure 5kg / cm, screen printing speed 6m / min.

[0021] First, screen-print the board, the green oil viscosity is 110dps, preheat at 70°C for 45 minutes, and the mesh number of the screen-printed board is 36T / cm 2 ;The radius of the oil retaining PAD b corresponding to the drill hole h is 5mil larger than the radius of the drill hole h (Chinese is "mil", which is often used in PCB circuit boards, and its conversion unit is: 1mil=1 / 1000inch=0.00254cm);

[0022] Then screen-print the edge of the hole with a diameter of ≤0.4mm. The viscosity of the green oi...

Embodiment 2

[0026] The green oil screen printing method of embodiment 2PCB

[0027] Except that the green oil viscosity is 100dps when printing the board surface, preheat at 75°C for 45 minutes, and the mesh number of the screen printing drilling hole is 100T / cm 2 Except that other process parameters are all the same as in Example 1, the small hole green oil capping oil non-plugging silk screen printing method provided by this embodiment can well meet the quality requirements of production, and reduce the green oil plugging holes, dirty development, Bad defects such as tin rings on the edge of the hole after film printing and tin spraying, tin beads hidden in the hole, etc., make the PCB have good electrical performance and appearance, and the process of this method is simple and easy to operate, and the production efficiency is improved.

Embodiment 3

[0028] The green oil screen printing method of embodiment 3PCB

[0029] Except that the viscosity of the green oil is 120dps when printing the board surface, preheating at 65°C for 45 minutes, and the mesh number of the screen printing drilling hole is 110T / m 2 Except that other process parameters are all the same as in Example 1, the small hole green oil capping oil non-plugging silk screen printing method provided by this embodiment can well meet the quality requirements of production, and reduce the green oil plugging holes, dirty development, Bad defects such as tin rings on the edge of the hole after film printing and tin spraying, tin beads hidden in the hole, etc., make the PCB have good electrical performance and appearance, and the process of this method is simple and easy to operate, and the production efficiency is improved.

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Abstract

The invention discloses a green oil silk-printing method for a printed circuit board (PCB). The green oil silk-printing method comprises the following steps: preprocessing, carrying out silk-printing, pre-baking the board, exposing, developing and post-curing, wherein a flow process of carrying out silk-printing on the surface of the board, preheating, carrying out silk-printing on the hole edge of a drilled hole and preheating is adopted in the silk-printing step; in the process of carrying out silk-printing on the surface of the board and preheating, the radius of an oil blocking PAD corresponding to the drilled hole is greater than that of the drilled hole by 5 mil; in the process of carrying out silk-printing on the hole edge of a drilled hole and preheating, the radius of a printing oil window of the drilled hole is greater than that of the drilled hole by 20 mil, and a blocking point with a radius smaller than that of the drilled hole by 1 mil is arranged in the middle of the printing oil window; and the number of meshes in the silk-printed hole edge of the drilled hole is more than that of the meshes in the silk-printed board surface. According to the green oil silk-printing method for the PCB, the silk-printing requirement of not blocking a small hole by green oil can be well met, the defects of blockage of the green oil on the hole, under developing, lateral erosion in film printing and developing, a tin ring on the hole edge and a tin ball hidden in the hole after prevention of tin spraying, and the like are reduced, the PCB is good in electric property and appearance, the method is simple in process and convenient to operate, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a circuit board manufacturing process, in particular to a green oil silk screen printing method for a printed circuit board. Background technique [0002] At present, with the development of electronic miniaturization, the performance requirements of PCB (Printed Circuit Board) for carrying, interconnecting electronic components and transmitting signals are higher. Printed circuit design tends to develop in the direction of high density, high precision, high reliability, narrow gaps, thin lines, and micro-holes. These high design requirements make the coating requirements of printed circuit board green oil more and more high. [0003] Usually, during the silk screen printing process of PCB, the green oil is easy to enter the hole or even cause the plug hole, especially the small hole, which is easy to produce bad defects such as unclean development, red circuit, film printing, development side erosion, etc., and it is easy to ...

Claims

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Application Information

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IPC IPC(8): B41M1/12
Inventor 梁炳源黄杏娇
Owner KALEX MULTI LAYER CIRCUIT BOARD (ZHONGSHAN) CO LTD
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