PCB Tech - PCB batch manufacturers: setting standards for the width of the process edge

PCB batch manufacturers: setting standards for the width of the process edge

In the process flow of PCB batch manufacturers, the reservation of the process edge is of great significance for the subsequent SMT chip processing. The process side is to assist in the production of the plug-in board, the part of the welding wave on the two or four sides of the PCB board. It is mainly used to assist in the production. It is not part of the PCB batch manufacturer and can be removed after the manufacturing is completed. The main reason for leaving the process side is that the track of the SMT placement machine is used to clamp the PCB board and flow through the placement machine, so the components that are too close to the track side are sucked in the nozzle of the SMT placement machine and mounted to When the PCB board, the phenomenon of collision occurs, and the production cannot be completed, so a certain process edge must be reserved, such as 1.5-5mm and so on. The same applies to some plug-in components to prevent similar phenomena during wave soldering.

Because the process side will consume more PCB boards, it will increase the overall cost of the PCB. Therefore, when designing the PCB circuit board process side, it is necessary to balance economy and manufacturability. For some special-shaped PCBs (PCB batch manufacturers), the original PCB board with 2 process edges or 4 process edges can be greatly simplified through the method of splicing. When designing the splicing method, it is necessary to fully consider the track width of the SMT placement machine. For splicing boards with a width of more than 350mm, it is necessary to communicate with the process engineer of the SMT supplier.

The flatness of the PCB process edge of the PCB batch manufacturers is also an important part of the PCB production, which has a big relationship with V-Cut. When removing the PCB process edges, it is necessary to ensure that the process edges are flat, especially for PCB boards that require extremely high assembly accuracy. Any uneven burrs will cause the mounting holes to shift and cause great troubles for subsequent assembly.