CN111273523A

CN111273523A - PCB developing method

Info

Publication number: CN111273523A
Application number: CN202010273495.0A
Authority: CN
Inventors: 马洪伟; 王修磊
Original assignee: Jiangsu Punuowei Electronic Co ltd
Current assignee: Jiangsu Punuowei Electronic Co ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-06-12

Abstract

The invention discloses a developing method of a PCB, which comprises the following steps: adding the developing solution into a developing tank, and heating to keep the developing solution at a constant temperature; placing the exposed PCB on a conveyor arranged in a developing tank, and simultaneously ensuring that the PCB is completely immersed in the developing solution; and then, the PCB can be subjected to movable soaking and developing treatment in a developing solution under the driving of the conveyor, and the conveying speed of the conveyor is controlled to be 1.5-6 m/min in the developing treatment process. The PCB developing method not only well improves the quality of the PCB, but also effectively reduces the rejection rate of the PCB and saves the production cost.

Description

PCB developing method

Technical Field

The invention relates to the technical field of PCB (printed circuit board) manufacturing, and particularly provides a PCB developing method.

Background

At present, a spraying type developing treatment mode is mostly adopted when the PCB is developed. However, since the spray type developing device is generally designed to be in a vertical spray mode, the spray type developing device can not be sprayed to every place of the PCB, and is easy to cause pollution of adjacent conveying rollers, and the quality of the PCB is greatly damaged after a long time. In addition, the spray type developing apparatus also requires regular maintenance, increasing production cost.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

In order to overcome the defects, the invention provides a developing method of a PCB, which not only well promotes the quality of the PCB, but also effectively reduces the rejection rate of the PCB and saves the production cost.

The technical scheme adopted by the invention for solving the technical problem is as follows: a PCB developing method comprises the following steps:

step 1), adding the developing solution into a developing tank, and heating to keep the developing solution at a constant temperature;

step 2), placing the exposed PCB into a conveyor arranged in the developing tank, and simultaneously ensuring that the PCB is completely immersed into the developing solution; and then, the PCB can be subjected to movable soaking and developing treatment in a developing solution under the driving of the conveyor, and the conveying speed of the conveyor is controlled to be 1.5-6 m/min in the developing treatment process.

As a further improvement of the invention, the temperature of the developing solution is 25-35 ℃.

As a further improvement of the invention, the conveyor is a roller type conveyor.

As a further improvement of the invention, the PCB placed on the conveyor is 5-10 cm below the liquid level of the developing solution.

As a further improvement of the invention, the developing treatment time of each PCB is 5-6 min.

As a further improvement of the invention, after each development is finished, the interior of the developing tank is cleaned by deionized water, and then new developing solution is added.

① compared with a spray type developing treatment mode, the developing treatment method has the advantages that when the developing treatment is carried out, the PCB is completely immersed in the developing solution, namely, the soaking developing treatment mode is adopted, so that the developing treatment method can carry out all-dimensional dead-angle-free developing treatment on the PCB, and can avoid the problems of dry film, ink solidification and the like of a transmission roller of a conveyor, thereby not only improving the quality of the PCB, but also effectively reducing the rejection rate of the PCB and saving the production cost, ② the developing equipment used by the developing treatment method is easy to clean, so that the maintenance efficiency is improved, the maintenance difficulty is reduced, and the production cost is saved.

Drawings

Fig. 1 is a schematic view of a PCB panel undergoing the mobile immersion developing process of the present invention.

The following description is made with reference to the accompanying drawings:

1-a developing tank; 2-the conveyer.

Detailed Description

The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical significance.

Example 1:

fig. 1 is a schematic diagram illustrating a PCB board undergoing the mobile immersion developing process according to the present invention.

The developing method of the PCB comprises the following steps:

step 1), adding the developing solution into a developing tank 1, and heating to keep the developing solution at a constant temperature;

step 2), placing the exposed PCB into a conveyor 2 arranged in the developing tank 1, and simultaneously ensuring that the PCB is completely immersed into the developing solution; then, the PCB can be carried out a movable soaking and developing treatment in the developing solution under the driving of the conveyor 2, and in the developing treatment process, the conveying speed of the conveyor 2 is controlled to be 1.5-6 m/min, and the conveying speed of the conveyor is set according to factors such as the type, the thickness and the like of the PCB so as to ensure that the PCB can be fully developed.

In this embodiment, preferably, the developing solution is a potassium carbonate or sodium carbonate solution, and the temperature of the developing solution is 25 to 35 ℃, and further preferably 30 to 32 ℃.

In this embodiment, it is preferable that the conveyor 2 is a roller conveyor; the PCB placed on the conveyor 2 is located 5-10 cm below the liquid level of the developing solution.

In this embodiment, the developing time for each PCB is preferably 5-6 min.

Preferably, after the development treatment of each batch of PCB plates is completed, the film residue, ink and the like in the developing tank 1 are cleaned by deionized water, and then a new developing solution is added. In addition, after each development is finished, the PCB is cleaned and dried by hot air at 70-75 ℃ and then enters the next process.

In summary, compared with a spray type developing treatment mode, the PCB is completely immersed in the developing solution during the developing treatment, namely, the soaking developing treatment mode is adopted, so that the PCB can be developed in an all-around dead angle-free mode, the problems of dry film, ink solidification and the like of a conveying roller of a conveyor can be avoided, the quality of the PCB is well improved, the rejection rate of the PCB is effectively reduced, and the production cost is saved. In addition, the developing device used by the invention is easy to clean, so that the maintenance efficiency is improved, the maintenance difficulty is reduced, and the production cost is saved.

The above embodiments are merely illustrative of the efficacy of the present invention and not intended to limit the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be construed as being within the scope of the present invention.

Claims

1. A PCB developing method is characterized in that: the method comprises the following steps:

step 1), adding a developing solution into a developing tank (1), and heating to keep the developing solution at a constant temperature;

step 2), placing the exposed PCB into a conveyor (2) arranged in the developing tank (1), and simultaneously ensuring that the PCB is completely immersed into the developing solution; and then, the PCB can be subjected to movable soaking and developing treatment in a developing solution under the driving of the conveyor (2), and in the developing treatment process, the conveying speed of the conveyor (2) is controlled to be 1.5-6 m/min.

2. The method for developing a PCB of claim 1, wherein: the temperature of the developing solution is 25-35 ℃.

3. The method for developing a PCB of claim 1, wherein: the conveyor (2) adopts a roller type conveyor.

4. The PCB developing method according to claim 3, wherein: and the PCB placed on the conveyor (2) is positioned 5-10 cm below the liquid level of the developing solution.

5. The method for developing a PCB of claim 1, wherein: the developing treatment time of each PCB is 5-6 min.

6. The method for developing a PCB of claim 1, wherein: after each time of development, the interior of the developing tank (1) is cleaned by deionized water, and then new developing solution is added.