A1 Journal article (refereed), original research

Influence of pulp type on the three-dimensional thermomechanical convertibility of paperboard


Open Access hybrid publication

Publication Details
Authors: Laukala Teija, Ovaska Sami-Seppo, Tanninen Panu, Pesonen Antti, Jordan Juha, Backfolk Kaj
Publisher: Springer Verlag (Germany)
Publication year: 2019
Language: English
Related Journal or Series Information: Cellulose
Start page: 11
End page: 17
Number of pages: 7
ISSN: 0969-0239
JUFO-Level of this publication: 2
Open Access: Open Access hybrid publication

Abstract

This study examines the effect of pulp type on the formability and
elongation of paperboard, which are of key importance when producing 3D
packages. Material performance was studied with a press-forming machine
using laboratory handsheets as substrates. The handsheets were prepared
from bleached softwood and hardwood kraft pulps, chemi-thermomechanical
pulp, recycled newsprint, and mixtures of birch kraft and other pulps.
The effect of microfibrillated cellulose (MFC) on substrate properties
and material formability was also investigated. The 3D elongation of
MFC-free handsheets varied between 1.2 and 5.5%. Depending on the pulp
type and sheet composition, three essential sheet properties were
recognized. These properties were bulk, elastic modulus and bending
stiffness, the first two of which affect material bending stiffness.
Sheets made from softwood fibers were superior to other samples, but
their low bending stiffness resulted in distortion of formed trays. A
partial replacement of birch kraft with recycled newsprint did not lead
to a loss of sheet extensibility, which suggests that the interactions
between the converting tools and the substrate have a great effect on
material convertibility. Scanning electron micrographs showed that the
pulp type affects the mechanism behind fracture initiation. The ability
of MFC to increase extensibility was limited to mechanical pulps,
indicating the important role of the main pulp component in defining
tensile properties.


Last updated on 2020-20-03 at 10:03

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