mardi 20 août 2013

Steps To Follow In Manufacturing Of PCB

By Cara Torres


Manufacturing of PCB has been simplified through innovation and advancement in technology. You will require a photo resist board which forms the basics of the entire assembly. This is a piece of glass with reinforcements made of plastic. On the one end is a photo sensitive copper coating. It is by peeling this plastic film that one reveals the photo sensitive coating.

You will then place the now transparent printed circuit board beneath the photo resist board. They should be of exact same size. The surface is sensitive after the removal of the plastic film. Placing the mask in the right way-up ensures that the tracks do not end up facing the wrong direction. The board is then ready for transfer into the UV light box.

The lid to the box should be appropriate in order to make the box completely covered. The box should be switched on for about two and half minutes. This board should only be handled using plastic tongs because of its delicate nature. The board is then transferred into the development box. It takes slightly more or less than ten seconds in this box and then it is removed. Extending time in this box is dangerous and could destroy it completely.

Using the plastic tongs, remove the board from the development tank and wash it in clean water. This board is then placed in an etching tank. It is heated to the point of bubbling. Unwanted copper materials are removed during heating. The tracks will become clear after at this stage. Close monitoring avoids damaging the track.

The entire process of etching lasts fifteen to forty five minutes. Exposing your board for less time makes it undeveloped while allowing it to stay for too long will lead to damage. The tracks may even be removed. Monitoring must be on a minute to minute basis. It takes experience to master the entire process.

Incorporation of Auto CAD system or Computer Aided Design in the process makes it simple and thus easier to complete. Data inscription is easy which makes transfer to manufacturers much easier. This automated system is able to earmark and define your required copper layers. Component notifications and soldier marks are also easy to identify using the automated system.

Photo tools are prepared using laser photoplotters. A controlled dark room is the best environment for such work. It makes it easier to manage temperatures and humidity. Data for the board is turned into a pixel image making it easier to work with. The film is written using a laser writer. The film develops automatically and is unloaded by the operator.

Profiling or V-cut scoring is the process that completes manufacturing of PCB. The process takes place at the production panel and uses a scoring machine. A third of the board is cut to ensure that it remains intact. Engaging an expert ensures that the entire process of manufacture meets your expectations.




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