... copper plating lines to get a flasch of copper.. The panels are attached to plating racks. When the racks are moved to the loading | PCB PRODUCER | station, the system computer instructs the hoist to pick up the rack and begin the plating cycle. The copper plating time is approximately one hour. | PCB PRODUCER | Electrolytic copper of minimum thickness 12 microns is deposited on the surface of the panel and on the walls of the drilled holes. This is | PCB PRODUCER | achieved by applying an electric current to a cell comprising the panel (the cathode) and a set of copper bars (the anodes) suspended in a | PCB PRODUCER | conducting medium (the electrolyte). A plating history log is maintained on the shop floor control computer which assists the operator in making minor adjustments to | PCB PRODUCER | the plating current. Finally, the panels are rinsed and returned to the unload station. Sample measurements are made from each rack of panels to confirm | PCB PRODUCER | the proper plating thickness in the holes. + zoom + Chemistry-Laboratory - Automatic pH Meter with LED Readout - Hot ...
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... escalates. Automated mechanical drilling systems equipped with multiple spindles, control-depth positioning, and high-velocity positioning tables can process several panels simultaneously to achieve higher throughput | PCB PRODUCER | and lower processing costs. Mechanical drilling is an effective method for hole diameters larger than 0.010" (250 microns). Below 0.010", however, operational costs rise exponentially. | PCB PRODUCER | For example, a manufacturer might get 5,000 hits per drill bit when forming 0.008" or 0.010" vias but only 1,000 hits per bit for 0.006" | PCB PRODUCER | vias. However, recent advances in mechanical drilling technology such as high-speed spindles (Figure 4a and 4b) have increased drill bit life two to three times | PCB PRODUCER | over previous generations of mechanical drills. And since the PCBs can be stacked, it is possible for mechanical drills to be similar to laser drills | PCB PRODUCER | in productivity. The minimum hole size economically manufactured by mechanical drills currently seems to be 0.006". To drill holes smaller than ...
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... baths call for a great deal of analysis and supervision due to the narrow processing slit. The process of solder mask coating as well | PCB PRODUCER | as de- oxidation of bare copper surfaces (activation) must perfectly match the gold plating. To prevent the risk of poor metallic deposition on the gold surface, | PCB PRODUCER | vias must be completely free of solder mask coating or be completely closed by means of a special filling process. Curing of the solder mask | PCB PRODUCER | coating must also concur with that of the chemical gold plating as it is exposed to hydrogen in the 90° C nickel baths. One has | PCB PRODUCER | the choice between an expensive coating system or a subsequent infrared solidification which, in turn, also calls for further investment in facilities. THE POTENTIAL For | PCB PRODUCER | a lead free altenative provided the PCB manufacturer ensures optimal conditions for immersion nickel gold coating, the results of wave soldering are equally good to | PCB PRODUCER | solder levelling. Good storage ability is also achieved by covering the pad and smd sides ...
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