A carton is one of those everyday items you might take for granted, or perhaps you have asked yourself as you push your shopping cart past aisle after aisle of products on the shelves. It is a standard sheet of corrugated board is made from three components; a sheet of corrugated fluted paper sandwiched between an outside liner.
Albert L. Jones is the father of corrugated board. Born in America, Jones discovered the idea while manufacturing neck ruffs and frills on a pleating machine. Instead of using fabric he put paper through the milling cylinders to produce an elastic packaging material. In December 1871 he was granted a patent. In 1874 Oliver Long achieved a considerable improvement by gluing a fluted sheet of corrugating medium onto a linerboard, thus creating single face corrugated board. The first attempts to make corrugated board in Europe were started in 1883, in London. This was followed three years later, in 1886, by the first corrugated board factory on the continent at Kirchberg in Germany.
Types of Paper used for making Cartons
Basic material for the production of corrugated board is the paper-board. There are two main type of paperboard. There are two main types of paperboard: Kraft and Test.
- Kraft Paper: Comes from softwood trees - the strongest form of paper and the best to print on this is the most common outside liner for corrugated boxes.
- Test Paper: This is so-called double layer paperboard (duplex paper). Most standard cartons use recycled paper for the fluting and the inside liner.
Each sheet of liner paper is commonly composed of two layers. The finer cover layer is ideal for printing and aesthetics, and the basic layer is excellent for adhesion strength.
Thickness: After the paper type, the next thing to look at is the Thickness. This is measured the same way for all papers. Take one square meter of your paper and weight it. The result is XX grams per square meter (which is abbreviated to GSM). Example photocopy paper = 80gsm
Types of Cartons
Regular Slotted Carton (RSC)
Also called shipping boxes, RSCs are the most commonly used boxes. They are usually Kraft brown in color, have four flaps on the top and bottom and the side walls are sealed at one corner known as the "Manufacturer's Joint". This design is highly functional for most packing applications.
Full Telescope Design Carton (FTD)
A two-piece box with a separate lid that that fits over a bottom tray. For telescope type boxes the height (h) of the upper part (lid) should be given as a fourth measurement after an oblique stroke i.e.
350 (L) x 200 (B) x 120 (H) / 40 (h)
Two-Piece Carton with Separate Lid (CSL)
The "Manufacturer's Joint" is where the two ends of the side panels meet to form the box. At the point, the panels are fastened together with tape, staples or glue. The side panel thickness and content weight determine the type of seal used for the manufacture's joint. For example, glue is used for most single was boxes, but staples are found in some double was and in most triple wall boxes.
International Fiberboard Case Code
This code which is prepared in collaboration with ESBO (The European Solid Board Organization) contains a methodical presentation of all existing box design styles, a code number being assigned to each design. As a reference document, the code is used world-wide and it has been adopted by the United Nations.
|Cuts, Scores, Slits etc.||CL||Contours of erected cases or cutting lines of case blanks|
|CI||Crease Lines (inward bend)|
|CO||Crease Lines (outward bend)|
|SI||Slit-score lines (inward bend)|
|SO||Slid-score Lines (outward bend)|
|DS||Double score lines|
|SE||Soft Edge cutting lines|
|Manufacturer's Joint||PC||Stitched Joint|
|Flute Direction||FD||Flute direction indicator|
All dimensions are expressed as internal dimensions and can be specified in mm, cm, or inches depending on buyer's specs.
Example L350 x W200 x H120
- Length (L) = Longer dimension at the opening (Longer of the two slides)
- Breadth (B) = Shorter dimension at the opening (shorter of the two sides)
- Height (H) = Dimension from the top of the opening to these (perpendicular to length or width)
Linerboard Performance Standards
|Max Weight Box/contents (lbs.)||Min Burst Test single/double wall (lbs, per sq. inch)||Min Edge Crush Test (ECT) (lbs. per in. width)|
|Single Wall Corrugated Boxes|
|Double Wall Corrugated Boxes|
|Double Wall Corrugated Boxes|
Common Flute Sizes
Corrugated board has five common sizes of fluting, 'A','B','C','E' and 'F'. The letter designation refers to the order they were invented, not their relative size.
|Corrugated Board Size||Corrugated Sheet Size||Flute Height||Flute per linear foot|