CN102378499B - Manufacturing method of PCB (printed circuit board) solder mask two-side windowing plug hole - Google Patents

Abstract

The invention relates to a method for manufacturing a PCB solder mask two-side windowing hole plugging, which comprises the following steps: step 1: providing a PCB, wherein a first through hole for plugging a hole on two sides and a second through hole for plugging no hole on two sides are formed in the PCB; step 2: and (3) welding the PCB for the first time, wherein the manufacturing process comprises the following steps: two-side windowing hole plugging → first prebaking → first exposure → first development → first postbaking, after completing the two-side windowing hole plugging, directly performing first prebaking without performing silk-screen printing ink on the surface of the PCB; and step 3: and (3) welding the PCB for the second time, wherein the manufacturing process comprises the following steps: two-sided windowless plug hole → silk screen printing ink → second pre-baking → second exposure → second developing → second post-baking. The manufacturing method of the PCB solder-resisting two-side windowing hole plugging adopts an independent hole plugging process aiming at the two-side windowing hole plugging, and effectively overcomes the defects of hole plugging punch-through, oil vomit and the like.

Description

Method for making window plug holes on both sides of PCB board solder resist

technical field

The invention relates to the field of printed circuit board (Printed Circuit Board, PCB) production, in particular to a production method for opening windows and plugging holes on both sides of a PCB board for solder resistance.

Background technique

At present, when the PCB board with windows on both sides is subjected to solder resist processing, the following solder resist process is usually adopted: plugging → silk screen printing ink → pre-baking → exposure → development → board inspection → post-baking. When this solder mask process is used for production, it is easy to have quality defects such as punching through the plug hole or vomiting oil, which needs to be improved.

Contents of the invention

Therefore, the object of the present invention is to provide a method for manufacturing plug holes with windows on both sides of the PCB board, which adopts a separate plug hole process for the plug holes with windows on both sides, and effectively improves defects such as plug hole punching and oil vomiting.

In order to achieve the above object, the present invention provides a method for making window plug holes on both sides of PCB board solder resistance, comprising the following steps:

Step 1: Provide a PCB board, the PCB board is provided with a first through hole to be opened on both sides of the plug hole and a second through hole to be no window plug hole on both sides;

Step 2: Make the first solder resist on the PCB board. The production process is: open the window plug hole on both sides → the first pre-baking → the first exposure → the first development → the first post-baking, and perform double-sided opening During the window plug treatment, the first through-hole is plugged with solder resist, but the second through-hole is not plugged. After the window plugging is completed on both sides, the PCB surface is not plugged. Screen printing ink and directly carry out the first pre-baking, and after subsequent processing, a double-sided window plug hole is formed at the position of the first through hole;

Step 3: Make a second solder mask on the PCB board. The production process is: no window plug holes on both sides → silk screen printing ink → second pre-baking → second exposure → second development → second post-baking, When screen printing ink, screen printing is performed on the surface of the PCB board, and the screen used is provided with an oil stop at the position of the plug hole with windows on both sides to prevent ink from entering the plug hole with windows on both sides.

In the step 2, use aluminum sheet plug holes when opening windows on both sides, bake at 70°C for 60 minutes during the first pre-baking, and develop for the first time. The developing time is 75-90 seconds, and the developing pressure is controlled at 1.2-1.4Kg/cm ² , the first post-baking adopts segmented type, bake at 75°C for 30 minutes, bake at 90°C for 30 minutes, and bake at 120°C for 120 minutes.

In the step 3, when screen printing ink, the T number of the screen used is 43T or 48T, and the conversion relationship between the T number and the mesh number is 1T=2.54 ² mesh.

The diameter of the oil blocking point is 10 mil larger than the diameter of the first through hole.

Beneficial effects of the present invention: the manufacturing method of the plug hole with windows on both sides of the PCB board solder mask of the present invention adopts a separate plug hole process for the plug hole with windows on both sides by using the solder mask twice, which effectively improves the punching through of the plug hole And defects such as vomiting oil.

In order to further elaborate the technical means and effects adopted by the present invention to achieve the predetermined purpose, please refer to the following detailed description and accompanying drawings of the present invention. It is believed that the purpose, characteristics and characteristics of the present invention should be able to gain a deep and specific understanding from this , however, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

Description of drawings

The technical solutions and other beneficial effects of the present invention will be apparent through the detailed description of specific embodiments of the present invention below in conjunction with the accompanying drawings.

In the attached picture,

Fig. 1 is the schematic flow sheet of the manufacturing method of opening window plug hole on both sides of PCB board solder resistance of the present invention;

Fig. 2 is a schematic cross-sectional structure schematic diagram of a PCB board corresponding to each manufacturing stage of the manufacturing method of the present invention with solder-resisting holes on both sides of the PCB board.

Detailed ways

As shown in Fig. 1 and Fig. 2, the manufacturing method of opening a window plug hole on both sides of the PCB board solder resistance of the present invention comprises the following steps:

Step 1: Provide a PCB board, and the PCB board is provided with a first through hole 11 to be opened with windows on both sides and a second through hole 12 to have no window plug holes on both sides;

Step 2: Make the first solder resist on the PCB board. The production process is: open the window plug hole on both sides → the first pre-baking → the first exposure → the first development → the first post-baking, and perform double-sided opening During the window plug treatment, the first through hole 11 is plugged with solder resist, but the second through hole 12 is not plugged. After the window plug holes are opened on both sides, the PCB board The first pre-baking is directly carried out with screen printing ink on the surface, and after subsequent processing, a double-sided window plug hole is formed at the position of the first through hole 11;

Step 3: Make a second solder mask on the PCB board. The production process is: no window plug holes on both sides → silk screen printing ink → second pre-baking → second exposure → second development → second post-baking, During silk screen printing ink, the board surface of PCB board is carried out silk screen printing, and the screen plate that adopts is provided with oil retaining point 13 to prevent ink from entering in the two-sided window plug hole position.

In the step 2, use aluminum sheet plug holes when opening windows on both sides, bake at 70°C for 60 minutes during the first pre-baking, and develop for the first time. The developing time is 75-90 seconds, and the developing pressure is controlled at 1.2-1.4Kg/cm2, the first post-baking adopts segmented type, bake at 75°C for 30 minutes, bake at 90°C for 30 minutes, and bake at 120°C for 120 minutes.

In the step 3, when screen printing ink, the T number of the screen used is 43T or 48T.

The diameter of the oil blocking point 13 is 10 mil larger than the diameter of the first through hole 11 .

The above-mentioned method for manufacturing plug holes with windows on both sides of the solder mask on the PCB adopts a separate plug hole process for the plug holes with windows on both sides by dividing the solder mask into two times, so as to effectively improve defects such as plug hole punching and oil vomiting.

As mentioned above, for those of ordinary skill in the art, other various corresponding changes and modifications can be made according to the technical scheme and technical concept of the present invention, and all these changes and modifications should belong to the appended claims of the present invention scope of protection.

Claims (4)

1. the manufacture method of a pcb board welding resistance two sides windowed plug hole is characterized in that, comprises the steps:

Step 1: pcb board is provided, and described pcb board is provided with the first through hole for the treatment of the two sides windowed plug hole and the second through hole for the treatment of the windowless consent in two sides;

Step 2: described pcb board is made for the first time welding resistance, the making flow process is: two sides windowed plug hole → first time is pre-baked → for the first time exposure → develop for the first time → and roasting after for the first time, carrying out the two sides windows when filling in processing, adopting solder resist that described the first through hole is carried out consent processes, then not carrying out consent for described the second through hole processes, after finishing the two sides windowed plug hole, the plate face of pcb board is not carried out ink for screen printing and directly to carry out the first time pre-baked, after subsequent treatment, form the two sides windowed plug hole at described the first lead to the hole site;

Step 3: described pcb board is made for the second time welding resistance, the making flow process is: the windowless consent → ink for screen printing in two sides → second time is pre-baked → and bakes afterwards exposure → second development → second time for the second time, during ink for screen printing, plate face to pcb board carries out silk-screen, and the half tone that adopts is provided with the gear oil drop and enters in the windowed plug hole of two sides to prevent printing ink in windowed plug hole position, two sides.

2. the manufacture method of pcb board welding resistance as claimed in claim 1 two sides windowed plug hole is characterized in that, in the described step 2, use the aluminium flake consent during two sides windowed plug hole, when for the first time pre-baked, baked 60 minutes at 70 ℃, when developing for the first time, developing time is 75-90 second, development pressure is controlled at 1.2-1.4Kg/cm2, adopts segmented when roasting after the first time, bakes 30 minutes at 75 ℃, baked 30 minutes at 90 ℃, baked 120 minutes at 120 ℃.

3. the manufacture method of pcb board welding resistance as claimed in claim 1 or 2 two sides windowed plug hole is characterized in that in the described step 3, during ink for screen printing, the T number of the half tone that adopts is 43T or 48T.

4. the manufacture method of pcb board welding resistance as claimed in claim 1 two sides windowed plug hole, the diameter of described gear oil drop is than the large 10mil in the aperture of the first through hole.

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