Tuesday, August 13, 2013

Step By Step Manufacturing Of PCB

By Cara Torres


Manufacturing of PCB has been made simple with the introduction of technology in design and preparation. This innovative approach allows manufacturers to achieve better and more precise results. You will be required to get an appropriate photo resist board that has plastic reinforcements on glass. One of the faces of this board is photo sensitive and coated with copper. This surface is initially covered with a plastic film.

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.

Plastic tongs are used to transfer the board to the etching tank after it has been thoroughly cleaned using water. The box is switched on for heating until bubbles form. This process is supposed to remove excel copper material in order to leave the tracks clean and clear. This process should be closely monitored to ensure that the tracks are not damaged.

Etching takes between fifteen and forty five minutes. Letting the board remain in the tank for too long is likely to damage the tracks. There is a possibility that those tracks may get removed or damaged. This calls for caution by ensuring that the entire process is carefully monitored, minute by minute. Experience will make the process faster and more accurate.

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.

A controlled dark room makes preparation of photo tools easier. This is done using laser driven photoplotters. The room has the right temperature and humidity conditions for work. Converting the data used in manufacture of the images into a pixel image simplifies the process of manufacture. The film is written using a laser writer. The film is ready for unloading by the operator after automatic film development.

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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