the variable geometry seasoning tumbler is an adjustable tumbling device that allows for the uniform application of seasoning of snack food product such as potato chips , tortilla chips , corn chips , and the like . with the adjustable tumbling device , uniform application of seasoning can be achieved while minimizing snack food product breakage . the tumbler has adjustable upper and lower rolls that support a belt that receives and processes the snack food product . the belt has a catenary region wherein snack product is processed in a tumbling bed . by adjusting one or both rolls , the dimensions of the tumbling bed and the inclination of the belt can be easily modified . thereby , the tumbling parameters can be optimized for each type of snack product being seasoned .