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Numerical and experimental investigation of paperboard folding
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.). KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation.
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2011 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, no 4, 452-467 p.Article in journal (Refereed) Published
Abstract [en]

Creasing and folding of paperboard are important converting operations in manufacturing of packages. A two-dimensional finite element simulation of multiply paperboard that was creased and folded was presented, and the numerical results were compared with experimental data. The paperboard material model was defined by a combination of an anisotropic elastic-plastic continuum model with isotropic hardening and a softening interface model. Based on experimental observations of variations of properties in the thickness direction of the paperboard, a material mapping method was proposed to define the material parameter in the models. The tilted double notch shear test technique was used to measure the shear strengths for the paperboard interfaces. The material model and data were validated by simulations of the creasing process. Folding simulations were done for both paperboard machine direction and cross machine direction, to two crease depths, 0.0 mm and 0.2 mm. The simulation results were compared with experimental results, where the bending moment-rotation angle curve from the simulation and experiments showed good agreement.

 

Place, publisher, year, edition, pages
2011. Vol. 26, no 4, 452-467 p.
Keyword [en]
Folding, Finite element method, Multi-plied paperboard, Creasing
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-31516ISI: 000298868000013OAI: oai:DiVA.org:kth-31516DiVA: diva2:404451
Note
Trita-HFL, ISSN 1104-6813; 0502. QC 20110317Available from: 2011-03-17 Created: 2011-03-17 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Numerical and experimental investigation of paperboard creasing and folding
Open this publication in new window or tab >>Numerical and experimental investigation of paperboard creasing and folding
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

 This licentiate thesis aims to increase the understanding of deformation and damage mechanisms of paperboard during converting, especially creasing and folding will be analyzed.

 A simple two dimensional creasing simulation was performed. In this model, paperboard was modeled as a combination of an anisotropic elastic-plastic continuum model with isotropic hardening and a softening cohesive interface model. The paperboard was composed of four plies with uniform material parameters. Creasing simulations were done on both machine direction (MD) and cross machine direction (CD) samples to two crease depths 0.0 mm and 0.2 mm, respectively. The simulation results showed good agreement with experimental results.

 The out-of-plane shear properties are dominating factors for creasing and folding. Therefore, a test method to determine shear properties was proposed. This part of the work is based on the most recently proposed test method, the laminated double notch shear test. To improve the technique, double notches with declined slopes, called tilted double notch shear test, were used instead of uniform depth double notches. The influence of shear zone length was also investigated. The results reveal the short shear zone lengths gave higher shear strength and more pronounced shear strength profile.

 The results from the rst two analyses were utilized to study folding of paperboard. The simulation model was the same as in the creasing simulations. However, to improve the model and better account the actual micro structure of paperboard a new material mapping method was proposed. The continuum properties of the plies were assumed to vary in the thickness direction. The shear strengths of the interfaces were determined by using the tilted double notch shear test using a short shear zone length, L= 5 mm. The agreement between simulation results and experiment results was good, and most of the folding properties were captured.

 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 28 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0503
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-31430 (URN)
Presentation
2011-03-24, Sal E31, KTH, Lindstedtsvägen 3, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20110317

Available from: 2011-03-17 Created: 2011-03-15 Last updated: 2013-01-15Bibliographically approved
2. Numerical and Experimental Investigation on Paperboard Converting Processes
Open this publication in new window or tab >>Numerical and Experimental Investigation on Paperboard Converting Processes
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

An investigation of the mechanical properties of paperboard and its influence on converting processessuch as creasing, folding and forming, from both an experimental and numerical perspective wasperformed. Fundamental research to establish a material model for paperboard, and an experimentalout-of-plane shear test method was suggested. Research where the models were used for verificationwas also done. The numerical model is a combination of continuum and interface models. Thecontinuum model represents the paperboard plies, which is an orthotropic elastic-plastic model withHill criteria and isotropic hardening. The interface model is used for connecting the paperboard pliesand also contributing to the delamination properties during converting processes. The interface modelhas linear elastic behavior followed by the initiation and evolution of damage. Both of these twomodels are available in ABAQUS. An experimental characterization scheme consisting of threeexperiments: in-plane tensile test, double notch shear test and density measurements, was shown to besufficient to predict the creasing and folding behavior.The creasing and folding performance can be well predicted by the model. The impact of ply andinterface properties on different paperboards were investigated by numerical simulations, in order tomimic different production strategies. It was shown that the interface strengths mainly influenced thefolding behavior, whereas different ply properties affected the required creasing force.The forming investigation was conducted in a three dimensions deep pear-shape mould. The numericalinvestigation included the effect of pressure, boundary conditions, material properties, differentdeformation and damage mechanisms, i.e. delamination and plasticity. The results showed thesimulation can capture the failure pattern of experiments and the mechanisms during forming. Toachieve better forming performance with anisotropic commercial paperboard in an axis-symmetricmould, a combination of fixed and free boundary conditions can be used to minimize in-plane straincomponents while enabling delamination. Modification of material properties would enable an evenbetter optimization. Additionally, reduction of anisotropy can improve the forming performance.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. 29 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0538
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-125883 (URN)
Public defence
2013-08-30, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130815

Available from: 2013-08-15 Created: 2013-08-15 Last updated: 2013-08-16Bibliographically approved

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