Multi-ply carton for corrugated paperboard

By using a multi-layered cardboard structure, combined with neutral sulfite semi-chemical pulp and unbleached kraft pulp, the problems of bonding strength and moisture resistance of corrugated cardboard are solved, enabling the manufacture of high-strength, low-grammage, and low-chemical-consumption corrugated cardboard.

CN117480299BActive Publication Date: 2026-03-17STORA ENSO OYJ
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Patent Information

Application Number
CN202280035642.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2021-05-17
Filing Date
2022-05-13
Publication Date
2026-03-17
Estimated Expiration
2042-05-13

AI Technical Summary

Technical Problem

Existing corrugated cardboard is prone to delamination when the adhesive strength is insufficient, and it is prone to shrinkage when there is too much adhesive. It also lacks moisture resistance and mechanical stability, making it difficult to maintain high strength and low chemical consumption in low basis weight materials.

Method used

The multi-layered boxboard structure includes an outer layer made of high-content neutral sulfite semi-chemical pulp (NSSC) and an inner layer made of unbleached kraft pulp and cellulose-based strength enhancer. By adding cellulose-based strength enhancer and internal sizing agent to the inner layer, the bonding strength and moisture resistance are improved.

Benefits of technology

Without reducing the dehydration rate, the strength and mechanical properties of corrugated cardboard are improved, moisture resistance and bonding strength are enhanced, chemical use is reduced, and environmental requirements are met.

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Abstract

The invention relates to a multi-ply containerboard for corrugated board, said multi-ply containerboard comprising a first outer ply, a second outer ply, and at least one intermediate ply sandwiched between the first and second outer ply, wherein the first and second outer ply comprise at least 70 wt-%, based on dry weight, of neutral sulphite semi-chemical (NSSC) pulp, and wherein the intermediate ply comprises at least 30 wt-%, based on dry weight, of unbleached kraft pulp and at least one cellulose-based strength enhancer, and wherein the intermediate ply comprises less than 30 wt-%, based on dry weight, of NSSC pulp.
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