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● It safeguards the PCB from oxidation. ● It shields the PCB from heat sources. ● It protects the PCB from accidental circuit bridging during soldering. ● In cases of discharge, the solder mask acts as a barrier for the PCB. ● The solder mask prevents dirt and dust from harming the circuit components.
Clean the circuit board to remove all dirt and contaminants before beginning.
Apply the solder mask ink by placing the circuit board in the coating equipment containing solder mask ink. The thickness of the solder mask may vary based on how the PCB is used, the components involved, and the capability of the equipment to coat the PCB. During the hardening phase, the coating on the PCB solidifies and helps remove any excess coating from the PCB during development. If there are any solder mask residues on the PCB, they are dipped into a developer solution to remove them. Afterward, the board undergoes hardening and cleaning processes before moving on to development after applying the solder mask. Paste masks are stencils with perforations that facilitate solder paste application onto the PCB. Stencils are used to apply solder paste, and attaching components onto the printed circuit board becomes simpler. For a fit, the size of the paste mask must match that of the circuit board. The layer of solder paste aids in identifying copper areas. The stencil file utilized for application contains solder paste traces. A single layer is sufficient to coat one side of a PCB using one stencil file. Two stencil files are necessary when applying paste to both sides of the PCB.
● Facilitating soldering of components on the PCB. ● Allowing for reflow during soldering when assembling the PCB. ● Enabling the use of surface mount technology in the PCB assembly process.
● Begin by preparing the PCB through an etching process. ● Choose a method for applying the paste mask. ● To achieve the desired pattern, you can use a stencil or a spray gun to apply the mask. Alternatively, you can move the curtain system to apply the mask. ● Afterward, expose the PCB to UV light to solidify the mask and inspect its quality. ● Remove any mask from the PCB to achieve the desired pattern.
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