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Cleaning process and device for removing ionic contamination from PCB (printed circuit board)

A PCB board and deionization technology, applied in the field of PCB ion cleaning, can solve the problems of ion cleaning process failing to reach customers, ignoring oxide layers, etc., and achieve the effect of reducing ion pollution, saving labor costs, and promoting development

Pending Publication Date: 2019-09-17
江门市奔力达电路有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the existence of the metal oxide layer on the surface of the PCB, most metal oxides are ionic compounds and are composed of ions, while the traditional ion cleaning process often ignores the existence of the oxide layer, and the traditional ion cleaning process cannot meet the current customer requirements.

Method used

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  • Cleaning process and device for removing ionic contamination from PCB (printed circuit board)
  • Cleaning process and device for removing ionic contamination from PCB (printed circuit board)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preferably, the liquid medicine used for pickling is a citric acid solution, wherein the mass percent concentration of citric acid is controlled at 4%.

[0038] Preferably, the pickling includes using pickling solution to rinse the PCB board by spraying, and the spraying pressure is controlled at 1.5Kg / cm 2 , The temperature value of the pickling solution is controlled at 20°C.

[0039]Preferably, in order to wash away the remaining chemical solution for pickling in the pickling, the first multi-stage overflow washing sequentially includes overflow washing one, overflow washing two, and overflow washing three; wherein the overflow washing The first and the overflow washing are distilled water, which is used to initially wash off the pickling solution and other impurities on the PCB, and then the overflow washing is the third washing with DI. DI water is deionized water, which removes impurities in the form of ions. Water, DI water meets the requirements of ion pollutio...

Embodiment 2

[0044] Preferably, the liquid medicine used for pickling is a citric acid solution, wherein the mass percent concentration of citric acid is controlled at 5%.

[0045] Preferably, the pickling includes using pickling solution to rinse the PCB board by spraying, and the spraying pressure is controlled at 1.5Kg / cm 2 , The temperature value of the pickling solution is controlled at 30°C.

[0046] Preferably, in order to wash away the remaining chemical solution for pickling in the pickling, the first multi-stage overflow washing sequentially includes overflow washing one, overflow washing two, and overflow washing three; wherein the overflow washing The first and the overflow washing are distilled water, which is used to initially wash off the pickling solution and other impurities on the PCB, and then the overflow washing is the third washing with DI. DI water is deionized water, which removes impurities in the form of ions. Water, DI water meets the requirements of ion polluti...

Embodiment 3

[0051] Preferably, the liquid medicine used for pickling is a citric acid solution, wherein the mass percent concentration of citric acid is controlled at 6%.

[0052] Preferably, the pickling includes using pickling solution to rinse the PCB board by spraying, and the spraying pressure is controlled at 2Kg / cm 2 , The temperature value of the pickling solution is controlled at 40°C.

[0053] Preferably, in order to wash away the remaining chemical solution for pickling in the pickling, the first multi-stage overflow washing sequentially includes overflow washing one, overflow washing two, and overflow washing three; wherein the overflow washing The first and the overflow washing are distilled water, which is used to initially wash off the pickling solution and other impurities on the PCB, and then the overflow washing is the third washing with DI. DI water is deionized water, which removes impurities in the form of ions. Water, DI water meets the requirements of ion pollution...

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PUM

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Abstract

The invention discloses a cleaning process and a cleaning device for removing ionic contamination from a PCB (printed circuit board). The cleaning process includes following flow paths of acid pickling, first multistage overflow water cleaning, ion removal cleaning, second multistage overflow water cleaning, drying and cooling. The cleaning device comprises a running roller conveyor belt used for conveying the PCB, wherein an automatic board placing machine is connected with the head end of the running roller conveyor belt, an acid pickling segment, a first multistage overflow water cleaning segment, an ion removal cleaning segment, a second multistage overflow water cleaning segment, a drying segment and a cooling segment are sequentially arranged on a passing path of the running roller conveyor belt, and an automatic board collection device is connected with the tail end of the running roller conveyor belt. The cleaning process and the cleaning device for removing the ionic contamination from the PCB improve cleaning effects of removing the ionic contamination from the PCB, and save labor cost, and the cleaning device can perform accurate parameter control, and the cleaning effects of the cleaning process for removing the ionic contamination from the PCB are further improved, and then ionic contamination degree of the PCB is further reduced, and furthermore PCB industry development is promoted.

Description

technical field [0001] The invention relates to the technical field of PCB ion cleaning, in particular to a cleaning process and device for deionizing contamination of a PCB board. Background technique [0002] At present, with the rapid development of the electronics industry, the integration of electronic products is getting higher and higher, the density of components on the circuit board is increasing, the wiring of the circuit board is also very dense, and the spacing between lines is also increasing. smaller. Therefore, customers have increasingly strict requirements on the degree of ion pollution of incoming PCB finished boards (the requirement for the degree of ion pollution to be less than or equal to 2.5 microns per square inch), so the finished PCB board needs to be added with ion cleaning process before shipment. Considering the existence of the metal oxide layer on the surface of the PCB, and most metal oxides are ionic compounds, composed of ions, the traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/08B08B3/04B08B13/00H05K3/26
CPCB08B3/08B08B3/048B08B13/00H05K3/26
Inventor 钟华爱
Owner 江门市奔力达电路有限公司
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