... Multilayer Lamination Press ML Lamination Press The book is then transferred to the vacuum lamination press proved to be a major step forward. In | CIRCUIT BOARDS FABRICATORS | this approach, the books are enclosed in a vacuum tight chamber, permitting lamination to take place in a vacuum environment. The press applies heat and | CIRCUIT BOARDS FABRICATORS | pressure so that the thermosetting resin in the prepreg undergoes cross-linking which bonds all layers together. The press then goes through a critical cooling cycle | CIRCUIT BOARDS FABRICATORS | before the book is removed and pulled apart. The edges of the multilayer panels are then trimmed to eliminate any of the resin outflow and | CIRCUIT BOARDS FABRICATORS | to smooth out uneven or rough edges. Special attention was given to environmental compatibility and safety conditions. Furthermore, the facility was designed to accommodate future | CIRCUIT BOARDS FABRICATORS | expansions. The requirements were as follows: - LP formats: Up to 640 x 610 mm - LP thickness: 0.30 – 10.0 mm - Materials: FR- | CIRCUIT BOARDS FABRICATORS | 4, BT-epoxy, polyimide, ...
[ Circuit Boards Fabricators ]


... PRINTED CIRCUIT BOARDS | | HOLE BREAKOUT | A condition in which a hole is not completely surrounded by the land. | HOLE DENSITY | CIRCUIT BOARDS FABRICATORS | | The quantity of holes in a printed board per unit area. | HOLE LOCATION | - The dimensional location of the center of a | CIRCUIT BOARDS FABRICATORS | hole. | HOLE PATTERN | The arrangement of all holes in a printed board. | HOLE PREPARATION | The hole prior to plating shall be | CIRCUIT BOARDS FABRICATORS | clean cut and free of burrs, loose or hanging fibers, copper dust and resin dust. | HOLE PULL STRENGTH | The force (in pounds) necessary | CIRCUIT BOARDS FABRICATORS | to rupture a plated-through hole when loaded or pulled in the direction of the axis of the hole. | HOLE |Void A void in the | CIRCUIT BOARDS FABRICATORS | metallic deposit of a plated-through ...
[ Circuit Boards Fabricators ]


... some 5 microns of nickel and a layer of pure gold of thickness approximately 0.07 microns. The function of the gold is simply to | CIRCUIT BOARDS FABRICATORS | prevent oxidation of the underlying nickel, which is the solderable finish. Test panels are run on the line at regular intervals to monitor etch rates | CIRCUIT BOARDS FABRICATORS | (by weight loss) and plating rates (by weight gain). After gold plating the panels are rinsed and dried in preparation for inspection. A visual assessment | CIRCUIT BOARDS FABRICATORS | is carried out for surface imperfections and the panels tape-tested to ensure satisfactory adhesion of both plating and resist. OSP Organic Solderability Preservative (alternativ) This | CIRCUIT BOARDS FABRICATORS | is a further alternative to the hot air levelled solder and electroless nickel / immersion gold finishes. It is an organic solderability preservative (OSP) and | CIRCUIT BOARDS FABRICATORS | is normally applied after the screen printing and profiling stages of manufacture. Boards to be treated are chemically etched, cleaned and dried before being passed | CIRCUIT BOARDS FABRICATORS | through a flood rinse module containing the OSP ...
[ Circuit Boards Fabricators ]