Note: This is the first in a series of articles (“Lessons”) covering the basics of corrugated displays and boxes.
Corrugated is the material with which boxes are made. You know the ones: the large refrigerator boxes you played with as a kid, moving boxes, and even that blue crate your Cuties come in. What corrugated is NOT is cardboard, chipboard, or cereal box material.
Corrugated is made out of an outside liner, the medium, and the inside liner. The liners are what we see. Liners can be left natural, which would be kraft or a type of white paper. They can also be printed and labeled but that’s a whole other lesson! The medium is the fluted material between the liners and that comes in a variety of different size flutes depending on the application and strength you need it for.
Common Board Styles
One medium is glued to one flat sheet of linerboard.
The medium is between two sheets of linerboard. Also known as Double Face.
Three sheets of linerboard with two mediums in between.
Four sheets of linerboard with three mediums in between.
Flutes are what make up the medium. It is paper curved by the corrugator and then starched into place onto the liners. The flutes give the strength or cushion to your box. They come in various “standard” sizes. A, B, C, E, F and last of all N (not shown) which is the smallest of all the flutes and not as common as the rest.Different flutes can be combined together into one piece of board. For example, that large refrigerator box you used to play with was most likely a B/C Double wall board. Two flutes combined together is considered double wall and 3 flutes combined together is triple wall. The flute letter that comes first is the flute that will be on the outside of the board.