In the production process of FPC, in order to save costs, improve production efficiency and shorten production cycle, it will only be produced in the form of patchwork, rather than monolithic production. There are several principles to follow when assembling FPC.

1. On the premise that each process can be produced, try to "squeeze" the circuit board assembly. The so-called "squeeze" is to reduce the distance between adjacent boards and circuit boards, thereby reducing the size of the whole assembly, saving production materials, and reducing production costs.

2. The spacing between single plates shall be at least 2.5mm. First of all, this is to meet the requirements for positioning holes. In the process of mass production, die stamping is generally used for molding. In order to enhance the accuracy of die stamping, positioning holes need to be placed between each piece in the assembly to avoid the offset of die stamping, which will lead to the scrapping of FPC; In the process of sample production, laser cutting is generally used for forming. In order to avoid slight deviation and avoid deviation of one piece and the whole piece, single pieces cannot be directly connected, so that they do not affect each other.

3. Etched characters shall be added to FPC plate assembly, and the size and quantity of plate assembly shall be briefly described, so as to facilitate verification and calibration in subsequent production.

4. Add positioning holes at the four corners of the whole assembly, and select one corner to mark different positioning holes, so as to keep the direction consistent in the subsequent process production, so as not to lead to the return of film sealing and character printing.

5. The width of the plate shall be fixed as 250mm and the length shall be within 250mm as far as possible. The larger the size of the plate, the greater the offset, the worse the production precision, and the higher the defective rate of finished products.

After reading the previous section, you should know more or less. Now let's briefly introduce the three ways of FPC composition.

1. Regular composition. The pattern is directly arranged in the direction of a single piece, which is most suitable for FPC pattern with regular shape, such as rectangle, square, circle, ellipse, etc;

2. Oblique splicing. Tilt the single piece to a certain extent, and then array it, so as to maximize the use of the space for the assembly, such as the curved bars, folds, etc;

3. Reverse stitching. That is, combine one positive and one negative of a single PCS.