E, F  and N types of flutes are known as microflutes because they are so small.

E-Flute

E-flute has the lowest number of flutes/foot (94) but still gives it a great shock resistance & a flat surface which is good for the purpose of high-quality printing. The E-Flute also reduces the size of the box and saves storage space. Due to its thin profile and cushioning properties, E-Flute can substitute for conventional folding cartons. However, E-flute is still thicker for directly printed on most of the offset presses.

F-Flute

F-Flute is almost half thick of the size of the E-flute and is a popular option in the corrugated packaging market. The idea for F-flute was started in Europe, aiming to slash the fibre content in the packaging. So, converting to F-Flute can help reduce the amount of fibre in the packaging box.

There is much difference between the E and F flutes. F-flute is around half hick of E-flute and has about 35% more flutes per inch. When it comes to printing, F-flute offers superior printing surface, Further to this, it can be printed through offset presses as well as it can also be converted on folding carton machines.

There is a growing trend of using E/F flutes today, though they still have a small market share. F-flute is also used in the fast-food industry among other industries to reduce carbon footprint and replace polystyrene containers.

N-Flute

N-flute is the finest flute and can be used for direct litho printing. N-flute is lightweight, can provide more protection and offer a superior surface for printing which can make it an ideal choice for decorative packaging applications.

Both F and N types of micro flutes are getting tractions in the packaging industry owing to less carbon footprint and better protections. The market size of the microflute market is also expected to increase in the coming years.

The below image shows microflute types in comparison with other thicker flute types.