Method for manufacturing paperboard comprising a bulk ply

The method addresses fiber flocculation issues in high-speed paperboard production by using a wire shaker with specific frequencies and stroke lengths, along with strength enhancement agents, achieving improved formation and retention.

WO2026115453A1PCT designated stage Publication Date: 2026-06-04STORA ENSO OYJ
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
STORA ENSO OYJ
Filing Date
2025-11-26
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing methods for manufacturing paperboard with high long and bulky softwood fibers face challenges in maintaining good formation and minimizing fiber flocculation, particularly at high production speeds, leading to defects like mottling and uneven mechanical properties.

Method used

A method incorporating a wire shaking mechanism that shakes the wire at specific frequencies and stroke lengths, combined with strength enhancement agents like highly refined cellulose, microfibrillated cellulose, or cationic/anionic additives, to improve fiber dispersion and retention in high-speed paperboard machines.

Benefits of technology

The method enhances formation and retention, resulting in high-quality paperboard with improved mechanical properties and reduced fiber flocculation, even at high speeds and wide machine widths.

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Abstract

A method for manufacturing paperboard in a paper-making machine, the method comprising the step of: forming a bulk ply by applying a pulp suspension comprising at least 50 wt% (based on the total dry weight of the pulp suspension) of high-bulk softwood pulp and 0.01-10 wt% (based on the total dry weight of the pulp suspension) of a strength enhancement agent selected from the group consisting of highly refined cellulose, microfibrillated cellulose (MFC), a cationic strength additive, an anionic strength additive, or a combination thereof, from a headbox onto a moving wire to form a wet web, at least partially dewatering the wet web on the wire to obtain an at least partially dewatered web, and drying the at least partially dewatered web to obtain the bulk ply; wherein the wire is provided with a wire shaker which shakes the wire at frequency of 100-600 strokes per minute and a stroke length of 5-35 mm.
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