Device and method for blackening or browning copper blocks

Abstract

The invention provides a device for blackening or browning copper blocks. The device for blackening or browning the copper blocks comprises a container containing the copper blocks and blackening or browning medicine liquid and a stirring device, wherein the stirring device is used to stir the blackening or browning medicine liquid in the container. The invention further provides a method using the device for blackening or browning the copper blocks. The method includes: enabling ingredients of the blackening or browning medicine liquid in the container to remain effective through the stirring device and a circulation loop formed by a liquid inlet pipe, a liquid discharge pipe and the blackening or browning medicine liquid in a blackening or browning medicine liquid vat; and respectively arranging automatic valves on the liquid inlet pipe and the liquid discharge pipe to control blackening or browning time. By using the method, the copper blocks are even in blackening or browning, and good in quality.

Description

technical field [0001] The invention belongs to the technical field of circuit board manufacturing, and in particular relates to a method for blackening / browning copper surfaces, and more specifically, to a method for automatically blackening / browning copper blocks. Background technique [0002] Printed circuit board (PCB, Printing Circuit Board) is one of the important components of the electronics industry. It provides mechanical support for the fixed assembly of various electronic components such as integrated circuits, realizes the electrical connection or electrical insulation between various electronic components such as integrated circuits, and provides the required electrical characteristics, such as characteristic impedance, etc.; Welding provides solder resist graphics, and provides identification characters and graphics for component insertion, inspection, and maintenance. [0003] Printed circuit boards are used in the form of single-layer boards, double-layer b...

AI Technical Summary

Problems solved by technology

The gap between the rollers used for transmission on the browning line is larger than the size of the copper block, so the copper block and the circuit board cannot be placed on the browning line together for browning

At present, the problem of browning of copper blocks has not been automated, and it is all manually operated. The copper blocks are put into a container filled with browning liquid and browned and then taken out.

As the browning progresses in the container, the concentration of copper ions accumulated on the copper surface continues to rise, and the browning of each surface of the copper block is uneven, which is significantly different from the surface of the browning line of the PCB copper plate, resulting in a high defective rate of electronic products.

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