How would you define spin time and how is it different from dwell time?

• A. Spin time is the stationary phase under pressure.
• B. Spin time is the period of rotation generating heat; dwell time is stationary under pressure to complete bonding.
• C. Spin time and dwell time are interchangeable.
• D. Spin time is the cooling phase.

Answer: (B)

Spin time is about how long the substrate is spun during a process. The rotation itself can generate heat through friction and solvent evaporation, and that duration helps control factors like film thickness and drying. Dwell time, on the other hand, is how long the parts stay stationary under pressure to allow bonding, curing, or wetting to complete. Since one is a rotating, heat-creating step and the other is a static holding step for bonding, they serve different purposes and aren’t interchangeable. The other descriptions misstate spin time as a stationary phase or cooling phase and don’t capture the role of rotation and heat generation.