First, the process of multi-layer soft PCB lamination: lamination, mold opening, loading, mold closing, prepressing, forming, cooling, mold opening, blanking, inspection, and the next process.
Precautions and operation instructions for lamination:
A. Prepare the release film/steel plate/silica gel and clean the dust and debris on the surface of the steel plate/silica gel/release film with sticky dust cloth or sticky dust paper.
B. Open the size of the release film (500m*500m) and place it in the laminated area for backup. After each laminated soft plate of a cycle, 400 spare steel plates are needed to make the production continue without breaking.
C. When laminating, wear gloves on both hands or finger covers on five fingers. Do not touch the soft board with bare hands.
D. Put steel plate, silica gel, release film, soft PCB and release film first
10 layers of silica gel and steel plate (except for special requirements); The number of FPC circuit boards placed on each layer is determined by the size of each 1PNL board. The number of FPC that can be swung on each layer is determined by the size of each 1PNL board (the distance between the board and the four sides of the silica gel shall be kept 7 centimeters or more); When swinging the plate, FPC should be placed in the central part of silica gel as far as possible, and the spacing of each plate is 2cm. The thickness of FPC placed in each layer should be consistent (for example: single panel cannot be mixed with multi-layer board; For each opening and each layer, the FPC graphics should be the same, and the position and sequence of graphics should be roughly the same. FPC laminating surface or reinforcing surface should be placed upwards. Release film to smooth cover on the soft plate, can not have wrinkle and folding phenomenon. After operation, place the laminated FPC flat on the conveyor belt and send it to the next procedure. Shenzhen flexible circuit board factory basically more this method, such as the commonly used FPC flexible line and so on are produced in this way.
Release film, must first confirm the release film front and back. Confirm method :1. Use an oil pen to draw in a corner of the film. If the handwriting is very clear, it is on the reverse side, and if it is not clear, it is on the front side. Wear white gloves to touch the release film, a very smooth side can be smooth that side is the front, vice versa.
Lamination operation production process: film withdrawal - pre-treatment - lamination - pressing - plating
Laminating process: drilling - BS film - over plastic - pressing substrate - Cu plating
Strict soft circuit board manufacturers have to complete every step of the operation in accordance with the provisions.
Basic structure of FPC flexible circuit board
In recent years, with the widespread popularity of mobile products such as smart phones and tablet computers, flexible PCB boards, which were not recognized by many people, have been more and more adopted, while many people do not know much about the structure of FPC.
From the combination of flexible circuit board base material and copper mooring, it can be roughly divided into flexible circuit board with glue and flexible circuit board without glue.
First, talk about glue-free products. The price of glue-free FPC flexible plate is much more expensive than that of glue-free material, mainly because the processing difficulty of glue-free base material is high and complex. But in terms of performance, glue-free FPC is better than glue-free products in terms of bonding force between copper foil and substrate and flatness of pad, and its flexibility is also better than glue-free products. Therefore, it is mainly applied to some products requiring higher performance.
Although adhesive flexible circuit board is slightly inferior to non-adhesive products in some aspects, but because of its cheaper price, performance and non-adhesive products are not too different, general products are competent, so the vast majority of soft PCB applications on the market or adhesive material. We also mainly analyze the structure of FPC flexible circuit board with adhesive material as an example.
Like rigid PCB board, FPC soft board also has single side, double side, multi-layer flexible board.
