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What is Corrugation?

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 or flute, 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. Three-layer or a multi layer structure, corrugated cardboard is much stronger than regular cardboard.

Corrugated Ply Types
Types of corrugated Ply

3-Ply corrugated carton

A 3-Ply corrugated carton has 1 flute between 2 line boards. This three-ply corrugated carton is normally used as an inner carton or a carton for any lightweight products. In other words, it is good for shipping and storing products that are not heavy or using them as an inner carton that will be placed inside of a stronger outer carton.

5-Ply Corrugated Carton

A 5-ply corrugated carton will have 2 sections of fluted paper sandwiched between 3 linear boards. A 5-ply carton can usually handle pressure and be stacked up for transportation.This is one of the most common cartons used to export goods. The 5-ply corrugated cartons are economical, plus they are strong and can handle a lot of weight and handling.

7-Ply Corrugated Carton

A 7-ply corrugated carton would have 3 layers of flutes between 4 linear boards This carton has one extra row of flutes and linear boards from a 5-ply carton.A 7-ply carton should be used to pack items such as very heavy furniture, metal parts, or items which require a very strong carton.

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Types of Flute
Types of Flutes

A-Flute : A-Flute is the original fluting for corrugated boxes. With about 30-36 flutes per 30cm, it can be used for a double wall application or thick corrugated pad.

B-Flute : B flute provides the second highest arch size at about 44-50 flutes per 30cm. It has a good stacking strength and crushing resistance. Common packaging uses: food packaging, retail packaging, die cut inserts, and customized print packaging.

C-Flute : The C flute is an all-purpose flute that has about 36-42 flutes per 30cm. It is the most common flute amongst the rest and it provides good cushioning, stacking and printing properties. Common packaging uses: shipping cartons, master shippers and corrugated box displays.

E-Flute : E flutes are an environmentally friendly substitute for green packaging which has about 86-94 flutes per 30cm. Common packaging uses: retail packaging, printed corrugated box packaging, eco-friendly packaging.

F-Flute : F flute is also an environmentally friendly replacement to folding cartons. At about 124-132 flutes per 30cm, the F flute offers a very aesthetically pleasing and value-for-money look. It provides a solid structural packaging. Common packaging uses: custom printed and corrugated boxes, retail packaging.

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