Final answer:
Alkaline perms are designed to produce faster processing times and stronger curl patterns, suitable for coarser hair types.
Step-by-step explanation:
The type of perms that produce faster processing times and stronger curl patterns are alkaline perms. Alkaline perms have a higher pH than acid perms and are designed to work quickly on the hair, breaking the disulfide bonds more efficiently to achieve a strong curl. This is suitable for hair that is coarser or less porous, as the stronger chemicals can effectively reshape the hair into curls. Alkaline perms provide a firmer and more resilient curl. It's important to ensure that hair is in good condition before applying an alkaline perm to prevent damage.