Monday, August 19, 2013

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Step By Step Manufacturing Of PCB

By Cara Torres


Technology has simplified manufacturing of PCB. The procedure is more innovative and utilizes advanced technological aids to achieve the best results. Assembly begins with acquiring the right photo resist board. It is made of glass and plastic used as reinforcement. One end has a copper coating that is photo sensitive. The photo sensitive surface will be revealed when the plastic film is peeled off.

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.

Technology has simplified the process of design since a Computer Aided Design system or Auto CAD may be used. The data is easier to in-script and transfer to manufacturers. This automated system defines and earmarks your copper layers. It makes it easier and clear to identify soldier marks and component notifications.

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.

Manufacturing of PCB is not complete until profiling or V-cut scoring is done. This is done from the production panel. A scoring machine is used in this process. Cutters are either above or below the panel. The cut is made at a third of the entire thickness in order to leave a film that connects the board together. The board is then checked thoroughly by an experienced person to ensure that everything is in order.




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