There are two types of corrugation sheets.

Separator sheet:
The first type is known as separators. They come handy when there is a need to separate products. They are kept over and under the product and used as a wall for separation with other products. They are two ply or three ply.

Bleach Board Sheet:
Bleach board sheets are single ply used in offset printing. They keep unit cartons separated in master cartons as a wall.