asp net core 2.1 barcode generator

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Two basic types of spray equipment have been used for spray coating PCBs with solder mask, HVLP (high volume, low pressure), and electrostatic HVLP spray systems are most common Single- and double-sided spray units are available The solder mask is sprayed at a reduced percent solids compared to screen printing, so circuit coverage and tack drying can be more of a problem, especially if the ink and/or spray guns are not heated Heating of the ink allows more solvent to evaporate between the nozzle and the panel, resulting in a higher viscosity liquid on the panel The higher viscosity theoretically allows greater circuit coverage with less ink The conventional HVLP spray process utilizes a low pressure stream of solder mask liquid that is atomized by a high volume stream of air.

The atomized solder mask is directed to the PCB surface in a specific pattern so that as either the panel or the spray head(s) move, a uniform coating is applied to the panel In some systems, the ink is heated just before spraying to lower its viscosity and aid in the evaporation of solvent between the spray nozzle and the panel Typical process variables for HVLP spray include ink viscosity, ink (pot) pressure, atomization air pressure, conveyor speed, and ink and atomization air temperatures In a typical electrostatic spray application, the ink is atomized and given an electrostatic charge while the PCB panel is grounded to attract the ink particles The intent is to limit the amount of overspray and provide a more even coating.

In reality, with the infinitely variable PCB designs to be coated, there are often many ongoing adjustments required to minimize Faraday effects that cause uneven distribution of the spray Often solder mask formulations need to be modified for effective use in electrostatic spray applications The main process variables in electrostatic spraying are solder mask temperature and viscosity (dilution), bell speed and voltage, back plane voltage, and shaping air pressures These variables are adjusted to provide a uniform coating of the desired thickness or weight Table 332 lists the process variables and the effect of operating at the extremes of that variable Curtain coating is an application method where the panel to be coated is rapidly passed through a continuous falling curtain of solder mask The curtain is created by pumping the solder mask through a die with a slot of controlled opening.

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The curtain falls vertically through an opening between two conveyors that carry the panels horizontally through the curtain, thus coating the panel on its upper side Solder mask that is not coated onto the circuit board panels falls into a trough between the conveyors and is recirculated The pump and conveyor speeds and the gap in the die control the coating thickness Solder mask used in curtain coating applications must be coated at reduced viscosity or percent solids (as in spray applications), so the increased VOCs emitted to the atmosphere may limit curtain coating s acceptability in some localities..

TABLE 33.2 Key Variables for Spray Coating and Effect of Low and High Levels for Each Variable Process variable Ink Viscosity Effect of low Low circuit coverage, Tack drying difficulties Effect of high Mottled or orange peel coating, excessive atomization, and overspray Possible clogging of lines or nozzle Thick coating, drying problems Excessive overspray Thick coating, insufficient drying, and/or bubbling

To get the nal result, we add this expression to (6.2). However, notice that e c e ea b V eb a V will cancel similar terms in (6.2), and so we are left with

TABLE 33.3 Key Variables for Curtain Coating Solder Mask Application and the Effect If the Process is Operated at the Extremes of That Variable Process variable Ink Viscosity Effect of low Low circuit coverage, dewetting, Streaks or breaks in the curtain ( blips ), Sagging of the coating Coat at incorrect percent solids, Sagging of the coating, Thin coverage Thin coating, low coverage Excessive coating Effect of high Unstable curtain, streaks, improper leveling, skips

Thick coating. drying problems Insufficient coating, Ink in holes, Teardropping on bottom side Thick coating, Insufficient drying and/or bubbling, Sagging of coating Unstable curtain, blips, Nonuniform coating