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What is a Corrugated Box?
A corrugated box is a disposable container whose sides are made up of layers of material that include an inside layer, outer layer, and middle layer. The middle layer is fluted, which means it is styled in rigid, wave-shaped arches that provide cushioning and support for weighted materials placed in a corrugated box.Get more news about Packaging Boxes 1 Layer,you can vist our website!

The common cardboard box has been around for over 200 years. The practice of adding flutes for corrugation began in the middle of the first industrial revolution. Over the years since its development, the corrugated box has become the most common form of shipping container and is found in every aspect of material management and transport.

Chapter Two – How Corrugated Boxes are Made
Though the construction of a corrugated box may seem to be a simple and easy process, various elements have to be considered prior to beginning manufacturing. As with all manufacturing and shipping equipment, corrugated boxes are designed and engineered to determine what they can hold, how much, and their strength.

The first step in box manufacturing is to examine the various elements of the box, which are construction, flute size, burst strength, edge crush strength, flat crush strength, the heaviness of the cardboard sheets, weight of the paper, and types of surface treatments.
There are five common types of corrugated flutings, which are A, B, C, E, and F. Though these are standard, manufacturers and designers can create and construct customized versions, which can be combinations of the standard versions or unique, unusual designs.

A – is the original type of flute at 36 flutes per foot and is used for double wall applications and thick corrugated padding.
B – has the second highest arch size with 49 flutes per foot and has stacking strength and crush resistance.
C – most commonly used flute with 41 flutes per foot for cushioning, stacking, and printing properties.
E – second common flute, environmentally friendly with 90 flutes per foot.
F – has small, tighter flutes, and is environmentally friendly with128 flutes per foot.
Aside from the five above flute styles, there are specialty flutes that are combinations of the above flutes or that fall between the regularly used flutes, such as D flutes. Other special flutes include EE, EF, and BC, which are used with double wall flute profiles. Flutes such as N and O are rarely used and are extremely small at less than half a millimeter.

Mullen Test (Burst Strength)
The burst strength of a corrugated box refers to the amount of force that can be applied before the material ruptures, cracks, or falls apart. The Mullen Test, which was developed over 130 years ago, applies force to the face of the corrugated material until it bursts. The results of the test are given in pounds with a rating. For example, a box rated at 200# can withstand 200 pounds (90 kg) of force per square inch. The results of the Mullen test offer data regarding the amount of force per square inch required to burst through the paper on a corrugated box.

The Mullen test is an indicator of how a box will endure its treatment when it is being shipped individually and subjected to the rough handling of assembly operations and mail carriers. As it moves through the multiple distribution channels, the contents of the box are more likely to move inside and possibly cause a puncture.

The flaw with the Mullen test is that the fluted medium doesn't add to the bursting strength of the box. This isn't to say the medium isn't important because 50% of the stacking strength of a box comes from the medium. This is where the Edge Crush Test comes in.