What are the key points of PCB backplane design?

Increasing user demands for increasingly complex large-size backplanes that can operate at unprecedented high bandwidths have led to the need for equipment processing capabilities beyond the Standard PCB manufacturing line. In particular, the backplane is larger, heavier, and thicker, requiring more layers and perforations than standard PCBs. In addition, the required line widths and tolerances are getting finer, and hybrid bus structures and assembly technologies are required.
Backplane has always been a specialized product in the PCB manufacturing industry. Its design parameters are very different from most other circuit boards. It needs to meet some demanding requirements in production. The noise tolerance and signal integrity also require the backplane design to follow unique design rules. These characteristics of the backplane result in huge differences in manufacturing specifications such as equipment specifications and equipment processing.

As a PCB Assembly Manufacturer, share with you the requirements of the backplane size and weight on the conveying system.
The biggest difference between a conventional PCB and a backplane lies in the size and weight of the board and the processing problems of large and heavy raw material panels. The standard dimensions of PCB manufacturing equipment are typically 24x24 inches. Users, especially telecommunications users, require larger backplanes. This has driven the need for identification and purchase of large-size plate conveying tools. Designers have to add extra copper layers in order to solve the routing problem of large pin count connectors, which increases the number of backplane layers. Harsh EMC and impedance conditions also require adding layers to the design to ensure adequate shielding, reduce crosstalk, and improve signal integrity.
When a high-power-consumption application card is inserted into the backplane, the thickness of the copper layer must be moderate to provide the required current to ensure that the card can work properly. All these factors lead to an increase in the average weight of the backing plate, which requires that the conveyor belt and other conveying systems must not only be able to safely move large-sized raw material plates, but also must take into account the fact that they are gaining weight.
The user's need for a backsheet with thinner cores and more layers brings two opposite requirements for the conveyor system. Conveyor belts and conveyors must be able to pick up and transport large gauge sheets less than 0.10mm (0.004 inches) thick without damage, and they must be capable of transporting 10mm (0.394 inches) thick and 25 kg (56 pounds). Board without dropping board.
The difference between the thickness of the inner layers (0.1mm, 0.004 inches) and the thickness of the finished backplane (up to 10mm, 0.39 inches) is two orders of magnitude, meaning that the conveyor system must be strong enough to safely transfer them Transfer through the processing area. Because the backplane is thicker than conventional PCBs, and the number of drilled holes is much, it is easy to cause processing fluid to flow out. A large 10mm thick backplane with 30,000 drilled holes can easily take out a small amount of processing fluid that is absorbed in the guide hole by surface tension. In order to minimize the amount of liquid carried and eliminate the possibility of any drying impurities remaining at the guide hole, it is extremely important to use high pressure flushing and air blowers to clean the borehole. Our company also has Aluminum PCB on sale, welcome to consult.