Types of Corrugated Boxes
With the current restrictions in place due to coronavirus, many consumers are ordering their essentials online. If your business is shipping out groceries, prepared meals, and other necessities, make sure you have the right corrugated cardboard boxes and containers to transport your goods safely. You'll find corrugated boxes used for many purposes across the foodservice industry, from food shipments to takeout containers. Keep reading to learn about the different types of corrugated cardboard and their uses.
What is Corrugated Cardboard?
Corrugated cardboard, sometimes just called corrugated, is a sturdy packaging material made of three layers of kraft paper. It’s named for the interior layer of wavy paper, also called the corrugated medium, which gives the cardboard its strength. During manufacturing, the inner sheet is put through the corrugation process to create flutes or stiff folds in the paper. The corrugated medium is then glued in between two sheets of kraft paper, which form the exterior liners. Thanks to the three-layer structure, corrugated cardboard is much stronger than regular cardboard.
What is a Corrugated Box?
Corrugated shipping boxes are made of sheets of corrugated cardboard. Stacks of corrugated cardboard are trimmed, scored, and folded to create cartons of all shapes and sizes. Glue is applied to corners and folds for even greater stability.
Benefits of Corrugated Boxes
Sandwiched between two pieces of cardboard, the ridged flutes of corrugated paper are designed to support a great deal of weight. Not only is this beneficial for shipping purposes, but it also plays an important part in supporting the weight of food in corrugated disposables like pizza boxes.
This cardboard fluting construction also plays an integral role in protecting items during transportation and preventing damages. The curved arches created by these flutes make boards durable and resist pressure applied from any angle. The empty space located between the flutes and under the arches even provides cushioning, as well as insulation in the event of extreme temperature changes.
Types of Corrugated Cardboard
All corrugated cardboard has a layer of corrugated fluting and at least one liner. Fluting and liners can be combined in different layers to create different types. These are the common types of corrugated board used in packaging and shipping:
Single Face Board
Single face board has only two layers, a liner layer and a corrugated layer. It's not as durable as the other types of corrugated cardboard but is often used inside of boxes to add extra cushioning.
- Order of Layers: Fluting, liner
- Uses: Interior packaging
Single Wall Board
Single wall board is the most common type of corrugated cardboard. If someone is talking about corrugated cardboard, they are most likely referring to this style. It consists of two outer liners and a middle layer of corrugated medium.
- Order of Layers: Liner, fluting, liner
- Uses: Shipping cartons
Double Wall Board
Double wall board has two layers of corrugated fluting and three liners, making it extremely durable.
- Order of Layers: Liner, fluting, liner, fluting, liner
- Uses: Industrial cartons
Triple Wall Board
Triple wall board sturdy enough to be used in place of wooden crates. Three layers of fluting make this corrugated cardboard a dependable choice for shipping chemicals or items that need special handling.
- Order of Layers: Liner, fluting, liner, fluting, liner, fluting, liner
- Uses: Shipping crates, chemical containers
Corrugated Flute Sizes
Different types of corrugated boxes are designated by the letters A, B, C, E, or F. The most frequently used flute corrugation is C flute, with 80% of boards and boxes making up this designation. The alphabetical designations of the flutes don't correspond to the sizes of corrugated boxes, but rather to the order in which the flutes were invented.
Note: Measurements are approximations. Manufacturers produce corrugated flutes which may vary slightly in size.
A Flute Cardboard
Type A cardboard has excellent compression and cushioning as well as good stacking strength. It is great for packaging fragile items and is commonly used for structural strength.
- # of Flutes / Linear Foot: 36
- Flute Height: 1/4”
B Flute Cardboard
Type B cardboard has excellent crush and puncture resistance and is a great printing surface. This cardboard is commonly used for inner packaging components such as pads and partitions.
- # of Flutes / Linear Foot: 49
- Flute Height: 1/8”
C Flute Cardboard
Type C cardboard makes a good printing surface. It also has compression properties and offers crush resistance. It is most commonly used for shipping boxes and to secure glass, furniture, food, etc.
- # of Flutes / Linear Foot: 41
- Flute Height: 11/64”
E Flute Cardboard
Type E cardboard’s thin construction helps to reduce storage space. It has excellent crush resistance and an exceptional printing surface. It is commonly used for displays, pizza boxes, ballot boxes, and packaging of consumer goods such as glass, ceramics, and cosmetics.
- # of Flutes / Linear Foot: 90
- Flute Height: 1/16”
F Flute Cardboard
Type F cardboard has an outstanding printing surface and excellent crush resistance. Its thin construction allows for stiffer boxes with less fiber. It is commonly used in fast food clamshell containers and packaging for consumer goods such as cosmetics, jewelry, and shoes.
- # of Flutes / Linear Foot: 128
- Flute Height: 1/32”
Corrugated Cardboard Recycling
Restaurants, grocery stores, and convenience stores accumulate corrugated cardboard with every shipment of food and supplies. Over time, the amount of cardboard quickly adds up. To dispose of the corrugated cardboard in the most efficient way, most businesses work with a local waste disposal company that collects and recycles the old corrugated containers (OCC).
To prepare the cardboard for recycling, all packing materials should be removed and the boxes must be flattened. Cardboard with grease spots cannot be recycled, so any portions of the box that have been soiled must be cut out. Tape and labels can be left in place because they are sorted out during the recycling process. For warehouses and industrial environments that produce large quantities of OCC, using a cardboard baler helps to save space.
Corrugated cardboard is the material of choice for anyone that needs to ship or package products. Now that you have an understanding of the types of corrugated boxes and fluting sizes, you can choose the corrugated cardboard that's best for your business.