Billerud has patented a method for producing containerboard using NSSC pulp in an extended nip press with a line load above 1200 kN/m. The resulting corrugated board has a fluting density above 725 kg/m3 and a geometric SCT index above 37 Nm/g. GlobalData’s report on Billerud 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 Billerud, Sustainable packaging paper coating was a key innovation area identified from patents. Billerud's grant share as of January 2024 was 61%. Grant share is based on the ratio of number of grants to total number of patents.

High-density corrugated board production method

Source: United States Patent and Trademark Office (USPTO). Credit: Billerud AB

A recently granted patent (Publication Number: US11814227B2) discloses a method for producing containerboard using Neutral Sulfite Semi Chemical (NSSC) pulp in a shoe press. The method involves pressing a web formed from the pulp with specific parameters such as a line load above 1200 kN/m, peak nip pressure of at least 90 bar, and a press impulse of at least 102 kPa*s. Additionally, the containerboard produced should have a geometric SCT index above 37 Nm/g. The method also includes variations such as applying steam to heat the web, using recycled fibers or reject pulp in addition to NSSC pulp, and maintaining a temperature of at least 45°C in the shoe press.

Furthermore, the patent includes specific parameters for the shoe press operation, such as a minimum nip length of 150 mm, a line load above 1300 kN/m, and a press impulse of at least 110 kPa*s. The temperature of the web in the shoe press can be increased to at least 55°C, and the geometric SCT index of the containerboard should be at least 38 Nm/g. Moreover, the method allows for variations in the pulp composition, with options to have at least 75% or 80% by dry weight of NSSC pulp. The grammage of the resulting containerboard is specified to be in the range of 100-200 g/m2, ensuring a certain level of quality and performance in the final product.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.