The following steps may be done during manufacturing in order to prevent logo infilling: I. Minimize foam generation during preparation of coating suspension. II. Reduce atomizing conditions and/or reduce drying conditions to minimize risk of spray drying. III. Improve drying (reduce spray rate or increase temperatures) to offset overwetting. IV. Increase pan speed to minimize dwell time in spray zone.

• A. All statements are correct
• B. Only ONE statement is correct
• C. Two statements are correct
• D. Three statements are correct

Answer: (C)

Controlling logo infilling is about how wet the coating stays on the surface and how long it remains in the spray zone. Minimizing foam generation helps here because foam can cause unstable flow and unintended movement of coating into recessed logo areas, leading to infilling. If the surface becomes overwetted, speeding up drying—or using higher temperatures to dry the coating faster—reduces the wetness that can flow into the logo features, which directly helps prevent infilling. Increasing pan speed to shorten dwell time in the spray zone can also help by reducing the time available for coating to flow into and fill in the logo, though it may affect coating thickness or uniformity. The other suggestions are less consistently reliable: altering atomizing and drying conditions to reduce spray drying can have mixed or uncertain effects depending on the system, so they’re not as direct a remedy for infilling as the first and third steps. Therefore, the two valid steps are minimizing foam generation and improving drying to offset overwetting.