Stora Enso has patented a lightweight linerboard for corrugated board, reducing washboarding issues. The linerboard includes a first ply with specific CTMP and chemical pulp percentages, exhibiting certain bulk and freeness properties. The corrugated board also comprises a corrugated medium and additional plies for strength. GlobalData’s report on Stora Enso gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Stora Enso, Sustainable packaging paper coating was a key innovation area identified from patents. Stora Enso's grant share as of February 2024 was 67%. Grant share is based on the ratio of number of grants to total number of patents.
A recently granted patent (Publication Number: US11926128B2) discloses a corrugated board with specific characteristics aimed at enhancing its performance. The corrugated board comprises a corrugated medium and a linerboard with a grammage between 80 to 150 gsm. The linerboard consists of three plies - a first ply containing a specific composition of CTMP and chemical pulp, a second ply made of 100% kraft pulp, and a third ply with a combination of CTMP and kraft pulp. The first ply exhibits certain bulk, freeness, and density characteristics, while the second ply serves as the top ply and the third ply as the back ply.
Furthermore, the patent claims detail additional features such as specific bending resistance indexes for the plies, overall bending resistance index for the linerboard, maximum density limits, and the inclusion of additives like starch and cellulose. The patent also covers a process for manufacturing the corrugated board, involving the combination of the corrugated medium and the linerboard. The emphasis on the properties of the CTMP in the first ply, including bulk and freeness values, highlights the importance of these factors in achieving the desired performance characteristics of the corrugated board. Overall, the patent aims to protect the unique composition and structure of the corrugated board to improve its strength and durability for various packaging applications.
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