Rigid flex pcb board

Rigid flex pcb board

What is rigid flex pcb board?

Rigid-flex PCB board, it is a circuit board that combines flexible and rigid circuit board technology in the application. Most rigid-flex boards are composed of multiple layers of flexible circuit boards, which are attached to one or more rigid boards from the outside and/or from the inside, depending on the design of the application. The flexible substrate is designed to be in a constant deflection state, and is usually formed as a deflection curve during rigid flex pcb manufacturing or assembly.

Hitech rigid flex pcb manufacturing process

After the production of FPC flexible boards is completed, the production of Hitech rigid flex pcb boards can be completed through the following processes.

1. Punching

Drill holes on FR4 and PP film, and the design on the alignment hole is not the same as the general through hole. After the punching is completed, browning is required.

2. Riveting

Laminate copper clad laminates, PP adhesives, and FPC circuit boards and place them neatly. The original old process is to laminate and pressing step by step, but it is a waste of time. After many attempts, we found that the stacking process can be completed once.

3. Laminate

This is a relatively complete step in the production of rigid-flex pcb board. Most of the materials are integrated for the first time. First, the bottom layer is copper clad laminate and PP film, above are the FPC flexible board produced in the previous process, and a PP film is placed on the FPC flexible board, then place the last layer of copper clad laminate. All materials to be laminated are placed in order and pressed together.

4. Trimming

That is to remove the part of the circuit board where there is no circuit at the edge of the circuit board currently and in the future. Afterwards, it is necessary to measure whether the material has excessive expansion and contraction. Because the PI used in the production of flexible boards is also expansion and contraction, this has a very large impact on the production of circuit boards.

5. Drilling

This step is the first step to turn on the entire circuit board, and the production parameters should be produced according to the design parameters.

6. Desmear

First, remove the scum generated by the drilling of the circuit board, and then use plasma cleaning to clean the through holes and the board surface.

7. Immersion copper

This step is the process of electroplating through holes, also known as hole metallization. Realize through-hole power conduction.

8. Plate plating

Partially electroplating copper on the upper surface of the electroplating hole makes the copper thickness above the through hole exceed a certain height of the copper clad board surface.

9. Outer dry film positive film production

The same as the production process of the anti-corrosion dry film of the FPC board, the circuit to be etched on the copper clad board is made. After the development is completed, check the circuit.

10. Graphic plating

After the initial copper sinking, pattern electroplating is performed, and the current time and copper plating wire are used according to the design requirements to reach a certain electroplating area.

11. Alkaline etching

12. Print solder mask

This step has the same effect as the FPC board protective film. We see that the PCB rigid board is generally green. This step is generally called green oil printing. After the printing is completed, the inspection is carried out.

13. Open the cover

Cover opening, which is the area where the FPC board is located, but the area not needed by the rigid board is laser cut to expose the FPC board.

14. Curing

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