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Corrugated Boxes are always measured in mm and expressed as Length x Width x Height (Depth).

Box Sizing In Manufacturing

The dimensions are expressed based on the opening of an assembled box, which can be located on the top or the side, depending on how it is to be filled. The opening of a box form a rectangle; that is, it has two sets of parallel sides. The longer of the two sides is considered its length, the shorter of the two sides is considered its width and the side perpendicular to length and width is considered the depth of the box.

Dimensions can be precise for either the inside or the outside of the box. Exact inside measurements must be calculated to ensure the proper fit for the product being shipped or stored. At the same time, palletizing and distributing the boxes relies on the outside dimensions. As an industry standard, the size given will mostly correspond to the inner dimentions of the box and will be given in mm due to the high level of accuracy required during manufacturing.

Box Sizing In Shipping
The volumetric weight of a shipment is a calculation that reflects the density of a package. The cost of transporting a shipment can be affected by the amount of space that it occupies on an aircraft rather than it's actual weight. Due to the importance of Volumetric Weight rather than acctual size, shipping companies will measure the outer dimensions of a package in cm rather than mm.

Volumetric Weight is calculated as Length x Width x Height (cm) and divided by 5000.

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The ABC's Of Corrugated

Corrugated Board is a composite structure consisting of a Fluted Layer called the "Medium" and a Flat Layer called the "Liner".

The Medium which is the Corrugation between the sheets is generally made using Recycled paper. Recycled paper tends to hold its shape better than Virgin Kraft as it has less rigidity due to shorter fibres. The paper laminated to the Corrugated Mediums known as Liners can be made from 100% Recycled paper or 100% Virgin Kraft and comes in various grades and thickness.

Kraft paper is manufactured from softwood trees. Due to the “virgin” fibres, it is both the strongest type of paper and also the easiest to print on. As a result, it is the most commonly used outside liner when selecting material to produce corrugated boxes and packaging. Test paper is actually a double layered (or duplex) paper. Being recycled, Test paper is not as strong as Kraft, or easy to print on, so is commonly used for the inside liner. It is, however, less costly than Kraft paper.

Corrugated Box Construction

Single Face Cardboard consists of a single Liner & Medium laminated together. Single Face is supplied on rolls and is widely used for general wrapping and protection of goods.

Corrugated Board Profile

The Flute Type describes the structure of the Medium with several types commonly used, "C-Flute - 4mm", "B-Flute - 3mm" & "E-Flute - 1.5mm".

Single Face rolls are usually made from B-Flute and is known as SFK rolls. These rolls are available in various sizes as standard and can be slit to any size required by the customer.

Single Wall Corrugated Sheets consists of a Double Liner & Single Medium laminated together. These sheets are used in the production of Corrugated Boxes. Single Wall Boxes are generally used for shipping of lighter items like crisps and general moving whereas Double Wall Boxes are used for heavier and more fragile items like motor vehicle spare parts and large shippers.

Essentially there are many different profiles for Corrugated Boxes that are dependent on the customer's requirements, final use and needs. Many different Flute Types, Board Combinations and Styles can be used to produce the ideal packaging solution for each product. Also, with Corrugated Cardboard being a largely recycled product, it is inexpensive and an ideal “green” packaging material.

Corrugated Box Styles
Corrugated Boxes can be manufactured in a wide variety of shapes and sizes, but they generally fall into a specific Style category. The most common style is an RSC (Regular Slotted Carton) which is used for most shipping or moving boxes. This style is usually made from a single piece of Corrugated Board called a blank. The blanks are scored and slotted for easy folding. These boxes conveniently shipped flat to the customer and are easy to erect, only requiring staples or tape to secure the flaps.

Other popular Styles include Half RSC (HSC), Fully Overlapping (FOLF) Fully Telescopic Base & Lid (FTD) and Die-Cut Boxes such as Pizza Boxes or Document Boxes with cut-out handles.

Corrugated Boxes comes in all Shapes and Sizes, from Simple Shipping Boxes to Complex Display Dtands. They can be made from Cheap Recycled materials or Expensive Virgin materials, come Plain or Branded. The posibilities are endless!