Cleaning and drying system for PCB
By introducing a clean drying system into PCB production, the problem of particulate matter adhesion caused by natural wind is solved by utilizing the clean air filtration and uniform drying structure of the cleanroom, thereby improving the cleanliness and yield of PCBs.
Patent Information
- Application Number
- CN202423045952.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-11
AI Technical Summary
The use of natural air in the drying section of the existing cleanroom causes particulate matter to adhere to the PCB board surface, affecting the quality of subsequent processes, especially causing circuit gaps or open circuits in the inner or outer layers of the pattern. Foreign matter residue during solder mask printing leads to the scrapping of ink due to impurities.
Design a clean drying system that includes a washing section, a drying section, and a cleanroom. The clean air from the cleanroom is filtered through a black cloth filter and then introduced into the drying section. The system uses upper and lower air hoods and small air ducts to achieve uniform drying and reduce the entry of particulate matter.
It effectively reduces particulate matter in the drying air, improves the cleanliness of the PCB board surface, avoids affecting subsequent processes, improves the quality and yield of finished products, and reduces production costs.
Smart Images
Figure CN223652456U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit board manufacturing equipment technology, and in particular to a clean drying system for PCB boards. Background Technology
[0002] In the drying section of the pre-processing line in the existing cleanroom, natural air is used for drying. Since natural air contains a large number of particles larger than 0.5um, these particles will adhere to the surface of the PCB board after it passes through the drying section. This results in foreign matter on the PCB board surface after lamination, coating, or printing. After the production of inner or outer layer patterns, the foreign matter under the dry film will cause circuit gaps or open circuits during etching. In the solder mask printing process, foreign matter on the board surface will cause foreign matter residue under the ink after printing, resulting in waste due to impurities under the ink. Summary of the Invention
[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a clean drying system for PCB boards to solve the problem of board jamming during PCB board production.
[0004] The purpose of this utility model is achieved as follows:
[0005] A clean drying system for PCB boards includes a washing section, a drying section, and a cleanroom arranged sequentially and connected to each other. The washing section includes a washing machine hood and a first conveying component, which is disposed inside the washing machine hood. The drying section includes a drying machine hood, a second conveying component, and a drying component, which are both disposed inside the drying machine hood. The cleanroom is equipped with multiple printing presses and a black cloth filter.
[0006] The first and second conveying components are arranged horizontally and coaxially to convey the PCB board; drying components for drying the PCB board are arranged above and below the second conveying component.
[0007] The drying assembly includes an upper air outlet hood and a lower air outlet hood, which are arranged parallel above and below the second conveying assembly. The upper air outlet hood and the lower air outlet hood are connected by a connecting pipe. The connecting pipe is connected to a blower, which is connected to one end of an exhaust pipe. The other end of the exhaust pipe extends out of the dryer hood and is connected to one end of an inlet pipe. The other end of the inlet pipe extends into the cleanroom, and the end of the inlet pipe extending into the cleanroom is connected to a black cloth filter, so that the clean air in the cleanroom is filtered by the black cloth filter and then introduced into the dryer hood.
[0008] Furthermore, the upper air outlet hood includes an air outlet square tube and an air outlet side tube, with an air outlet side tube vertically connected to each side of the air outlet square tube, making the upper air outlet hood a horizontally shaped c.
[0009] Furthermore, the bottom surface of the air outlet square tube is provided with a plurality of evenly distributed small air outlet tubes, and the inner surface of the air outlet side tube is provided with a plurality of evenly distributed small air outlet tubes.
[0010] Furthermore, the air outlet duct is connected to the connecting pipe, and is used to draw clean air out through the air outlet duct and blow it onto the PCB board on the second conveying component.
[0011] Furthermore, the structure of the lower air outlet hood is the same as that of the upper air outlet hood, and the lower air outlet hood and the upper air outlet hood are arranged symmetrically about the second conveying component.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] This invention provides a clean drying system for PCB boards. Clean air from a cleanroom is filtered through a black cloth filter before being introduced into the drying section. With the clean air and black cloth filtration controlling the process, particulate matter entering the drying section is minimized. After the PCB board passes through the pre-treatment drying section, the PCB board surface is almost free of foreign matter, greatly improving the cleanliness of the product and avoiding impact on subsequent printing, etching and other processes, thereby improving the finished product quality and yield. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] Figure 2 This is a schematic diagram of the drying section of this utility model.
[0016] Figure 3 This is a schematic diagram of the drying component of this utility model.
[0017] Figure 4 This is a schematic diagram of the structure of the upper air outlet cover of this utility model.
[0018] in:
[0019] 1. Washing machine hood; 2. First conveying assembly; 3. Drying machine hood; 4. Second conveying assembly; 5. Black cloth filter; 6. Air inlet pipe; 7. Air duct; 8. Blower; 9. Drying assembly; 9.1 Upper air outlet hood; 9.2 Small air outlet pipe; 9.3 Connecting pipe; 9.4 Lower air outlet hood; 10. Cleanroom; 11. Printing machine. Detailed Implementation
[0020] To better understand the technical solution of this utility model, a detailed description will be provided below in conjunction with relevant illustrations. It should be understood that the specific embodiments described below are not intended to limit the specific implementation of the technical solution of this utility model, but are merely possible implementations of the technical solution of this utility model. It should be noted that the descriptions of the positional relationships of the components herein, such as component A being located above component B, are based on the relative positions of the components in the illustrations and are not intended to limit the actual positional relationships of the components. Example 1
[0021] See Figures 1-4 , Figure 1 An exploded structural diagram of Embodiment 1 is shown. As shown in the figure, the present invention relates to a clean drying system for PCB boards, which includes a washing section, a drying section, and a cleanroom 10 arranged sequentially and connected to each other. The washing section includes a washing machine hood 1 and a first conveying component 2, which is disposed inside the washing machine hood 1. The drying section includes a drying machine hood 3, a second conveying component 4, and a drying component 9, which are both disposed inside the drying machine hood 3. The cleanroom 10 is equipped with multiple printing presses 11 and a black cloth filter 5.
[0022] The first conveying component 2 and the second conveying component 4 are arranged horizontally and coaxially to convey the PCB board; the washing machine cover 1 is provided with a blowing component, a cleaning component and a wiping component for blowing dust, cleaning and wiping water on the PCB board from left to right; the second conveying component 4 is provided with a drying component 9 for drying the PCB board above and below.
[0023] The drying assembly 9 includes an upper air outlet hood 9.1 and a lower air outlet hood 9.4, which are arranged in parallel above and below the second conveying assembly 4. The upper air outlet hood 9.1 and the lower air outlet hood 9.4 are connected by a connecting pipe 9.3. The connecting pipe 9.3 is connected to a blower 8, which is connected to one end of an exhaust pipe 7. The other end of the exhaust pipe 7 extends out of the dryer hood 3 and is connected to one end of an inlet pipe 6. The other end of the inlet pipe 6 extends into the cleanroom 10, and the end of the inlet pipe 6 extending into the cleanroom 10 is connected to a black cloth filter 5. The clean air in the cleanroom 10 is filtered by the black cloth filter 5 and then introduced into the dryer hood 3.
[0024] The upper air outlet hood 9.1 includes an air outlet square tube and an air outlet side tube. An air outlet side tube is vertically connected to each side of the air outlet square tube, making the upper air outlet hood 9.1 a horizontally shaped U-shape. The bottom surface of the air outlet square tube is provided with a plurality of evenly distributed air outlet small tubes 9.2. The inner surface of the air outlet side tube is provided with a plurality of evenly distributed air outlet small tubes 9.2. The air outlet small tubes 9.2 are connected to the connecting pipe 9.3 and are used to draw clean air out through the air outlet small tubes 9.2 and blow it onto the PCB board on the second conveying assembly 4.
[0025] The structure of the lower air outlet hood 9.4 is the same as that of the upper air outlet hood 9.1. The lower air outlet hood 9.4 and the upper air outlet hood 9.1 are arranged symmetrically about the second conveying component 4.
[0026] Working principle:
[0027] This utility model relates to a clean drying system for PCB boards, comprising a pretreatment washing process → drying section (clean air drying) → film application (coating or printing) → next process. The drying section utilizes a specific arrangement. Due to the upper and lower air hoods and the arrangement of the small air outlet pipes on both sides of the hoods, drying is more uniform and thorough. Clean air from the cleanroom is introduced into the drying section after being filtered through a black cloth filter. Since the clean air in the cleanroom contains 0.5µm particles, which are controlled to within Class 1000, the amount of particulate matter entering the drying section is relatively small. After passing through the pretreatment drying section, the PCB board surface has fewer foreign objects, improving product cleanliness and avoiding interference with subsequent printing, etching, and other processes. This improves the finished product quality and yield, and reduces production costs.
[0028] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of this utility model.
Claims
1. A clean drying system for PCB boards, characterized in that: It includes a water washing section, a drying section and a clean room (10) which are arranged in sequence and connected. The water washing section includes a water washing machine cover (1) and a first conveying component (2). The first conveying component (2) is arranged inside the water washing machine cover (1). The drying section includes a drying machine cover (3), a second conveying component (4) and a drying component (9). The second conveying component (4) and the drying component (9) are both arranged inside the drying machine cover (3). A plurality of printing machines (11) and a HEPA filter (5) are arranged inside the clean room (10); The first conveying component (2) and the second conveying component (4) are arranged horizontally and coaxially to convey the PCB board; The drying component (9) for drying the PCB board is arranged above and below the second conveying component (4); The drying component (9) includes an upper air outlet cover (9.1) and a lower air outlet cover (9.4). The upper air outlet cover (9.1) and the lower air outlet cover (9.4) are arranged in parallel above and below the second conveying component (4). The upper air outlet cover (9.1) and the lower air outlet cover (9.4) are connected through a connecting pipe (9.3); The connecting pipe (9.3) is connected to a blower (8). One end of the blower (8) is connected to an air duct (7). The other end of the air duct (7) extends out of the drying machine cover (3) and then is connected to one end of an air inlet pipe (6). The other end of the air inlet pipe (6) extends into the clean room (10), and the end of the air inlet pipe (6) extending into the clean room (10) is connected to the HEPA filter (5) to introduce the clean air in the clean room (10) into the drying machine cover (3) after being filtered by the HEPA filter (5).
2. The clean drying system for PCB boards according to claim 1, characterized in that: The upper air outlet cover (9.1) includes an air outlet square pipe and an air outlet side pipe. One air outlet side pipe is vertically connected to each side of the air outlet square pipe, so that the upper air outlet cover (9.1) is in a horizontally placed C shape.
3. The clean drying system for PCB boards according to claim 2, characterized in that: A plurality of uniformly distributed air outlet small pipes (9.2) are arranged on the bottom surface of the air outlet square pipe. A plurality of uniformly distributed air outlet small pipes (9.2) are arranged on the inner side surface of the air outlet side pipe.
4. The clean drying system for PCB boards according to claim 3, characterized in that: The air outlet small pipes (9.2) are connected to the connecting pipe (9.3) and are used to lead out the clean air and blow it onto the PCB board on the second conveying component (4) through the air outlet small pipes (9.2).
5. The clean drying system for PCB boards according to claim 4, characterized in that: The structure of the lower air outlet cover (9.4) is the same as that of the upper air outlet cover (9.1). The lower air outlet cover (9.4) and the upper air outlet cover (9.1) are symmetrically arranged above and below the second conveying component (4).