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Multiple cure recipes are usually needed to compensate for differences in panel design, materials, and construction Proper handling of the exhaust is important, as with all curing ovens Several issues must be considered in the tack drying process:.

Time at temperature Proper curing requires specified time at temperature. Ovens should be set up with a profiler to ensure that variables such as oven loading, heating capacity, ramp-up time, and so on, compensated for when establishing process conditions. Air flow Air flow in ovens must be parallel to the panel surface so that there is uniform temperature across the panels and the solvent is swept away from the coated surface. Debubbling time With some solder mask applications, it is important to have some time (usually 5 10 min. maximum) for the coating to debubble before the tack drying occurs. This allows time for the bubbles to break and for the coating to heal itself. Purge air All ovens need fresh air to be drawn into the oven to replace solvent-laden air that is exhausted. Without sufficient purge, air panels will not dry properly. Condensate Volatiles from the solder mask can condense on cool surfaces of the oven and ductwork. This material must be cleaned periodically so that it does not plug air passages. Proper safety equipment should be worn during cleaning.

See Table 33.4 for a list of oven types and their advantages and disadvantages. 33.5.2.1.3 Exposure. Exposing photoimageable solder mask requires equipment that provides the needed intensity of light of the proper wavelength to expose the solder mask to an extent that the exposed mask will withstand the developing process without washing away, lifting, or getting surface attack.

TABLE 33.4 Solder Mask Drying Ovens and Their Associated Advantages and Disadvantages Oven type Batch Pros Productivity large quantities with minimal manpower Low investment Not dependent on panel design, materials, or construction Consistency Consistency Uniformity Not dependent on panel design, materials, or construction Very fast cycle time Productivity Cons Potential for nonuniform temperature Opening oven doors causes temperature to drop Cure time may be oven-loading dependent

More handling Higher investment Thin panels may need a fixture to prevent them from bending Multiple recipes usually required to compensate for different materials, designs, and constructions Cannot cure every PCB design/construction Requires automation or extra handling High investment

b

Infrared (IR)

Exposure equipment must provide a means of holding a phototool in intimate contact with the surface of the panel being exposed and provide the required amount of light (millijoules/cm2) of the needed wavelength distribution (which may depend on the solder mask) at the appropriate intensity (mW/cm2). Unfortunately, many exposure devices that are used for exposing solder mask are substandard, including many units that were designed many years ago for exposing primary imaging photoresist. Modern units have high-intensity lamps (7 kW or higher) and sufficient lamp and exposure frame cooling to provide a highquality image very quickly. Lamp intensity and energy output should be monitored routinely with a radiometer sensitive to the appropriate wavelength to verify that the lamps are performing as expected. Intensity will decrease with lamp hours, making exposure times become longer. At the same time, the infrared output will increase, potentially causing frame cooling issues. Hot exposure frames cause artwork to stick to the mask, resulting in artwork marking or mask to transfer to the phototool. Laser units are available for exposing photoresist that have been used for exposing solder mask. These solder masks may be specially formulated to be sensitive to the laser wavelength. Laser imaging eliminates solder mask registration problems, but is not as productive as conventional exposure. Equipment cost is very high compared to conventional lamp exposure equipment. Underexposure will result is insufficient polymerization to withstand the development process properly without damage to the solder mask. Typical symptoms may include a dull or chalky surface, lifting of small features (e.g., solder dams), excessively undercut sidewalls, or lifted mask. Overexposure causes image growth where the exposed feature is larger than on the artwork and openings in the solder mask will be smaller. If the growth is excessive, the mask may grow onto the pads.

335214 Development Development of the unexposed solder mask material must be sufficient to clean out completely the smallest holes that must be free of mask Photoimageable solder masks may be developed in either aqueous or solvent chemistries The developer chemistry needed depends on the mask formulation In the development process, solder mask that has not been exposed to UV light and polymerized is washed away, or developed, from the PCB panel to reveal the desired pattern of solder mask For aqueous development, the chemistry is a warm, mildly alkaline (pH 106 113) solution of sodium carbonate (Na2CO3) or potassium carbonate (K2CO3) Proprietary chemistries are also available Antifoam is generally used to control foaming as the development solution loads with developed mask Solvent-developing chemistry typically uses gamma-butyrolactone (also known as GBL or butyrolactone) or butyl carbitol (2-(2-Butoxyethoxy)ethanol) solvent.