Fibre Character
Corrugating material produced from fresh wood using a combination of chemical pre-treatment and mechanical grinding offers superior structural performance for shipping containers. Semi-chemical virgin medium is known for its high stiffness and resistance to crushing, which stems from the retention of much of the natural lignin in the wood. This lignin acts as a reinforcing agent when the paper is formed.
It is primarily made from hardwood species like birch or oak.
Stacking Capacity
Stacking capacity of a corrugated box is significantly enhanced when this grade is used for the fluted layer. It maintains its shape under heavy loads better than recycled alternatives.
Corrugating Performance
Runnability on high speed machines is a major advantage because the fibres are strong and the sheet is uniform. During the fluting process, the semi-chemical virgin medium can be formed into precise arches without cracking. This structural integrity is maintained even in high humidity environments, making it the preferred choice for fruit and vegetable exports.
The higher cost of the material is often offset by the ability to use a lower basis weight while achieving the same box strength. Mills monitor the Concora Medium Test values to ensure the quality remains consistent. This paper grade is essential for heavy duty industrial packaging.
Its durability ensures that the contents arrive at their destination without damage.
