PCB assembly is that the PCB manufactururer takes charge the whole PCB assembly manufacturing including elctronic components purchasing, manufacturing and assembly.
① Save time and money
Delegating the whole PCB assembly manufacturing projects to a turnkey PCB assembly manufacturer enables greatly save your time. In other aspect, it is beneficial to save money if we choose one-stop PCB assembly manufacturing services because we don’t need to spend time to select other services like PCB assembly testing service provider.
② Spot error in time
Adopting one-stop PCB asssembly manufacturing servics can effectively detect and slove the errors timely. The engineer can help make some modification on design phrase start from your customized or ordinary orders. If we cope with the errors after the whole production is completed, it will cause great cost.
③Better monitor the process of PCB assembly manufacturing projects
Because we decide to delivery the whole PCB assembly manufacturing projects to one supplier, we don’t need to spend time to communicate with other suppliers. Once you want to make some modification or you detect some errors, you can discuss with the engineer in time, which minimizes the loss greatly.
Sometime, a turnkey PCB assembly manufacturing supplier also provide other services, for example the inventory and shipping arrangements. It enables greatly save your energy and money and improve your competition edge.
What is the PCB assembly manufacturing process?
PCB assembly manufacturing includes many aspects. Here take a 4 layer PCB as example.
① PCB layout
Checking the PCB layout design in advance. Generally, PCB assembly manufacturing supplier would accept the demand from the customer. In this step, PCB layout design will be detected to check whether it meets the manufacturing standard and any detects may appear.
②Inner PCB layer
A layer of photosensitive film will be covered after the copper clad laminate is cleaned. This kind of film gets cure under exposing on the light, and forms a protective film on the copper foil of the CCL.
③ Drilling the core board and inspection
After the core board is completely fabricated, then we need to punch alignment holes on it for better aligning with other materials.
Once the core board is pressed with other PCB layers, it is difficult to make some modification. Thus, the inspection becomes an important part, which compare with the PCB layout design drawings through machines.
Prepreg uses to adhere the core board and the outer cooper foil which has insulation capabilities. Fixed the copper foil of the lower layer and two layers of prepreg with the alignment hole and the iron plate of the lower layer in advance, then placed the prepared core board in the alignment hole.
Drill holes from the top and bottom, then make the hole wall become metallizing to get conduct electricity, you can connect 4 layers copper foils together.
Locating the inner core board through X-ray drilling machine, and then making position holes on the PCB to make sure that the following drilling passes through from the center hole.
⑥Copper chemical precipitation of the hole wall
The through hole on the PCB is for connecting different layers. In general, a 25 microns of copper film is reasonable to get connecting with other layers. This thickness needs to be electroplated.
⑦ Outer PCB layer
Make full use of photocopied film and photosensitive film to transfer the outer PCB layer to copper foil. Unlike the inner PCB layer, it adopts positive film. The photosensitive film on the PCB is cured to cover those non-circuit area.
⑧ Outer PCB layer etching
Remove the cured photosensitive film on the PCB, then use the strong base to clean those unnecessary and covered copper foil. For those tin coating left on the copper foil should be remove through tin solution.
Which PCB assembly manufacturing technology you should use?
Selection suitable PCB assembly manufacturing technology directly impacts the manufacturing efficiency, and product quality. Two technologies are commonly used in PCB assembly manufacturing: surface mount technology and through hole technology.
Surface Mount Technology
Like some electronic products such as medical machines and smartphones, their PCB assembly manufacturing process adopt surface mount technology.
Compared with through hole technology, it allows you to process the PCB in mass with high automation efficiency. Besides, it enables mount the components on both side of the circuit bo