The Price Step between Four Layers and Six
Moving from four to six layers adds 30 to 55 percent to bare board cost through double core usage, lamination press overhead, and tighter registration yields.
Net Panel Yield
Production Metric
Manufacturing output calculates the ratio of salable circuits remaining after the subtraction of board defects discovered during the fabrication process from the starting quantity of panels. Net panel yield accounts for every individual board that meets functional and visual criteria once the raw sheet exits the final etching or routing station. This figure isolates the efficiency of the factory floor by ignoring the influence of downstream assembly errors or component failures.
Economic Calculation
Financial analysts use the output to determine the cost per usable unit by spreading total batch expenses across the count of perfect boards. Processing stations that exhibit low performance force the manufacturer to increase the initial raw material input to reach a target delivery quantity. Discrepancies between the predicted total and the actual physical count reveal weaknesses in chemical etching consistency or tool calibration.
Constant monitoring of these counts avoids the hidden expenses associated with unexpected waste during high volume production runs.
Quality Threshold
Strict inspection protocols identify the specific boundary where a board moves from functional to scrap. Workers apply this standard during the automated optical inspection phase to separate boards with copper voids or solder mask shifts from those meeting customer requirements. Corrective actions depend entirely upon the data collected at this stage because the loss of material at the panel level prevents further recovery.
Success relies on identifying the exact location of recurring faults to adjust the lithography or drilling parameters before the next job begins.