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US 11,926,128 B2Granted
Light weight linerboard for corrugated board
AssigneeStora Enso OYJ
InventorsSeppo Lampainen, Frank Peng, Atso Laakso, Ari-Pekka Määttänen
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Abstract
The invention relates to a lightweight linerboard for corrugated board with good strength properties and which reduces problems with washboarding in the thereof produced corrugated board. The linerboard of the invention comprises at least one ply comprising 20-80 wt % CTMP from wood fibers and 20-80 wt % chemical pulp, all percentages calculated on the total fiber weight of said first ply, wherein the CTMP exhibits a bulk of at least 2.5 cm3/g.
Claims10
A corrugated board comprising:
- a corrugated medium, and
- a linerboard, wherein the linerboard has a grammage between 80 to 150 gsm and wherein the linerboard comprises:
- a first ply, wherein said first ply comprises 20-80 wt % CTMP from wood fibers and 80-20 wt % chemical pulp, all percentages calculated on a total fiber weight of said first ply, and
- wherein the CTMP exhibits a bulk according to ISO 534:2005 of at least 2.5 cm3/g,
- wherein the CTMP has a freeness according to ISO 5267-2 of at least 300 ml, and,
- wherein said first ply has a density according to ISO 534 of below 690 kg/m3,
- a second ply, wherein the second ply comprises 100 wt % kraft pulp calculated on a total fiber weight of said second ply,
- a third ply, wherein the third ply comprises 30-70 wt % CTMP and 30-70 wt % kraft pulp calculated on a total fiber weight of said third ply, and
- wherein said second ply forms a top ply, said first ply forms a middle ply, and said third ply forms a back ply.
6 more elements
Dependencies are inferred from the claim text.