Multi-ply liner for use in corrugated board
AssigneeStora Enso OYJ
InventorsIsto Heiskanen, Jukka Kankkunen, Ismo Saarinen, Jukka Lyyra, Juha Rvenniemi, Harri Taipale, Hannu Heikkinen
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Abstract
The present invention relates to a multi-ply liner for use in corrugated board, said multi-ply liner comprising: a first ply, and a second ply, wherein said first ply comprises at least 70 wt % unbleached kraft pulp and between 5-30 wt % neutral sulfite semi chemical (NSSC) pulp based on dry weight, and wherein said second ply comprises at least 50 wt % NSSC pulp and between 5-50 wt % unbleached kraft pulp based on dry weight.
Claims12
A multi-ply liner for use in corrugated board, said multi-ply liner comprising:
- a first ply, wherein said first ply comprises at least 70 wt % unbleached kraft pulp and between 5-30 wt % neutral sulfite semi chemical (NSSC) pulp based on a dry weight;
- a second ply, wherein said second ply comprises at least 50 wt % NSSC pulp and between 5-50 wt % unbleached kraft pulp based on a dry weight;
- and,
- a third ply, wherein said third ply comprises at least 70 wt % unbleached kraft pulp and between 5-30 wt % neutral sulfite semi chemical (NSSC) pulp based on a dry weight,
- wherein the multi-ply liner comprises more than 50 wt % neutral sulfite semi chemical (NSSC) pulp based on dry weight, and
- wherein the second ply is in between the first ply and the third ply.
A method for manufacturing a multi-ply liner for use in corrugated board, the method comprising the steps of:
- a) forming a first web layer from a first pulp suspension and dewatering said first web layer to obtain a first ply;
- b) forming a second web layer from a second pulp suspension and dewatering said second web layer to obtain a second ply on the first ply;
- wherein said first pulp suspension comprises at least 70 wt % unbleached kraft pulp and between 5-30 wt % neutral sulfite semi chemical (NSSC) pulp based on a dry weight, and
- wherein said second pulp suspension comprises at least 50 wt % NSSC pulp and between 5-50 wt % unbleached kraft pulp based on a dry weight;
- c) forming a third ply, wherein said third ply comprises at least 70 wt % unbleached kraft pulp and between 5-30 wt % neutral sulfite semi chemical (NSSC) pulp based on a dry weight, wherein the second ply is in between the first ply and the third ply,
- wherein the first ply, the second ply, and the third play are dried to form a multi-ply liner comprising at least 50 wt % neutral sulfite semi chemical (NSSC) pulp based on dry weight.
Dependencies are inferred from the claim text.