Layes of Corrugated Boxes

Different Structures/Layers of Corrugated Boxes

The term corrugated means a sinusoidal wave-like structure that is formed using appropriate machines. The folds thus formed are called “flutes”. There are many types of flutes out of which A, B, and E are widely used in the Indian market.

Corrugated Boxes are made of corrugated fiber-boards. These boards are made in 3-ply, 5-ply, 7-ply, etc. structures. The more layers, the higher will be the strength of the box. Let’s understand how different structures:

The top-most board is a 3-ply structure, as we can see the three layers of paper used to form the board. The base and top flat surfaces are called “liners” while the sandwiched-wave-like layer is called “flute”

Middle-board is a 5-ply structure with two types of flutes built-in to address the safety needs of containment of the box.

The lower board is a 7-ply structure with three different flutes combined altogether which are made according to the material which is being shipped in corrugated boxes made of these boards.

Corrugated Boxes are widely used and re-used across the world.

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The flutes used in these boxes play an important role. What exactly a flute means in a corrugation? Well, various types of flute are used in corrugated boxes among which the most normally used is Flute C which is used in more than 80% of the corrugated boxes. The different type of flutes has been made for various purpose.

Type A

Corrugated Boxes having type A flute has great compression and cushioning as well as fine stacking strength. This type of corrugated box is chiefly used to pack fragile products. The corrugated box contains 36 flutes every square foot with a thickness of ¼.

Type B

The box having type B flute is good in resisting puncture and flat crush. It is a top option for printing. This type of flute is mainly used in inner packing and displays. It contains 46 flutes each foot with a thickness having 1/8.

Type C

This kind of flute is used in the corrugated boxes that are used in making shipping boxes, box for food items and for protecting fragile items such as glass or furniture. It has compression properties and is crush resistance. It also lends a good printing surface.

Type E

Type E corrugated Boxes are mostly used in the packaging of consumer goods, displays, and food products such as pizza boxes. This box containing E type flute has quite thin construction and thus it takes less storage space. It has a superior printing surface and is crush resistance. It has 90 flutes on every foot with a thickness of 1/16.

Type F

A box containing an F Flute is lightweight and is extra thin as compared to other flutes. It is a great choice for printing purposes this is why it is used for packaging consumer goods such as jewelry, and shoes It contains 124 flutes per foot having a thickness of 1/32. It makes it superb in terms of crush resistance.