The change will also affect all plastic coated and laminated Invercote and Incada products.

A spokesman for the company said the price increases were a result of "continuously rising external costs".

He said: "Printers are in the same predicament as we are and the only way is to pass the increase onto their customers."

He added that February's earthquake in Chile and the recent strikes in Europe had both contributed to an already challenging market situation.

However, he said it was impossible to predict with any degree of accuracy as to whether the price increases would be as frequent during 2011.

Already this year, Iggesund put up the price of the two grades, revealing that the UK would pay £12 more per tonne for the products than the rest of Europe, which would pay €100 per tonne.

At the time, a spokesman for the company said there was still an imbalance in the price of the products in the UK compared to the rest of Europe.

"Historically, prices in the UK have been somewhat cheaper, and so these prices will help to balance that," he said.

Swedish-based Iggesund Paperboard is a member of the Holmen Group and manufactures high-quality virgin fibre paperboard for use in the packaging and graphics sectors.