Containerboard explained
Containerboard, also known as corrugated case material, refers to the paper-based components used to manufacture corrugated board. These include fluting medium papers, liner, and interliner paper, which are glued together in layers to achieve the desired strength and performance.
What is corrugated cardboard?
Corrugated cardboard is a general name for a lightweight box material consisting of at least three layers. The term corrugated refers to the middle layer, where the paper is formed in a wave-like curve, known as a flute, and then bonded to two flat outer layers, called liners.
What is a flute in a corrugated box?
A flute is the long, narrow hollow form in the middle layer – or layers – of corrugated cardboard. The flutes are created by corrugating the middle paper into a wave-shaped form and bonding it to a top and bottom layer, called the liner. This structure contains air, which makes corrugated cardboard both lightweight and strong.
Why is corrugated cardboard so strong?
Corrugated cardboard owes its strength to the fluting layer. The stability of the corrugated waveform follows the same physical principle as an arch, which withstands pressure by distributing forces along a curved structure.
Is corrugated cardboard stronger than regular cardboard?
It depends on how it is constructed, but corrugated cardboard can be stronger than regular cardboard, especially in relation to its weight. The corrugated structure adds stability and allows the board to withstand more pressure while using less material. Regular cardboard is generally easier to bend or break because it does not have a corrugated layer as part of its construction.
Is corrugated board eco-friendly?
Corrugated cardboard can be made extremely lightweight compared to many other packaging materials, making it resource-efficient in both production and use. Its strength-to-weight ratio allows less material to be used while still protecting goods during transport and handling.
Corrugated cardboard is a renewable, reusable, and recyclable material. Depending on its composition, it may also be compostable and biodegradable. To understand the carbon emissions associated with production, carbon footprint data should be obtained from the paper supplier or box converter.
The next generation kraftliner
At Holmen, we develop containerboard from fresh fibre sourced from responsibly managed forests. Holmen Elevate is an ultra-lightweight kraftliner that combines strength with reduced material use. It is certified food safe, approved for direct contact with dry, moist, and fatty foods, and fully compliant with EU standards. Learn more about Holmen Elevate
