Influence of Paperboard Structure and Processing Conditions on Forming of Complex Paperboard Structures

Östlund, Magnus; Borodulina, Svetlana; Östlund, Sören

doi:10.1002/pts.942

Cited by 35 publications

(39 citation statements)

References 3 publications

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“…In a few publications the process‐dependent material elongation for press forming and hydroforming is mentioned as a side effect. In press forming, the investigations focus on the relationships between the process parameters with respect to the deformation and damage mechanisms as well as the sealing of the produced trays.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the material elongation in the deep drawing of paperboard

et al. 2019

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In this paper, deep‐drawn paperboard cups are characterized in terms of their elongation along the cup wall. For this purpose, a method for the non‐destructive determination of the elongation was developed and tested. Using the presented method, a parameter study of the process parameters blank holder force, forming temperature, material moisture content, drawing velocity, and clearance ratio was performed. The influence of the process parameters on the cup wall elongation was determined by statistical design of experiments. Using the determined relationships between the process parameters, it was possible to achieve a shape‐specific characterization of the elongation along the cup wall. The parameter study showed a significant influence of the blank holder force, the forming temperature, and the material moisture content to the elongation along the cup wall.

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Section: Introductionmentioning

confidence: 99%

Characterization of the material elongation in the deep drawing of paperboard

et al. 2019

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“…In principle, elongation is the ability of material to increase its linear length under the action of external mechanical forces; the increase in the linear length is attributed to elastic and plastic deformations (Levlin and Söderhjelm 1999). This property increases the tensile energy absorption (TEA) potential of paper, which is defined as the integral of the tensile force and specimen elongation up to the point of failure, and is important for runnability of the web on the paper machine and in the printing house (Hristopulos and Uesaka 2002;Uesaka 2005;Deng et al 2007), and for converting operations of paper and paperboard (Gärd 2002;Post et al 2011;Östlund et al 2011). Elongation of paper is also one of the central components of formability of paper-based materials (Vishtal and Retulainen 2012).…”

Section: Introductionmentioning

confidence: 99%

The Elongation Potential of Paper – How Should Fibres be Deformed to Make Paper Extensible?

et al. 2012

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aElongation at failure is an important but underrated functional property of paper. Traditionally, elongation has been of specific importance for sack and bag paper grades. Mechanical treatments at high consistency are known to induce fibre deformations that contribute to the elongation of paper. However, it is not clear to what extent different fibre deformations can improve the elongation of paper. The aim of this work was to investigate the influence of three mechanical treatments on fibre and paper properties. The wing defibrator, the E-compactor, and the Valley beater were used for treating chemical softwood pulp. It was found that the type and intensity of mechanical treatments significantly affect the formation of fibre deformations, and thus the resulting properties of paper. The combination of high-consistency wing defibrator treatment and subsequent low-consistency valley beating provided paper with high elongation potential and good strength properties without impairing the dewatering properties.

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“…The hydroforming process consists of multiple parameters, which can be difficult to control individually, thus making the experimental determination of the quantitative effects of each parameter on the hydroforming process difficult (although some general effects of the parameters have been identified empirically in the experimental hydroforming studies by Östlund et al . Östlund et al and Groche et al .). Groche et al A finite element method (FEM) approach is beneficial, because FEM analysis would allow one to study the effects of each individual parameter on hydroforming and to optimize the hydroforming process for paper materials.…”

Section: Introductionmentioning

confidence: 95%

“…The hydroforming process for paper materials was introduced simultaneously in two separate research groups: the experimental study conducted by Östlund et al Östlund et al identified many of the important process parameters for hydroforming, and the experimental and numerical study by Groche et al . Groche et al identified friction as an important process parameter.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of Hydroforming of Paper Materials Using the Explicit Finite Element Method with a Moisture‐dependent and Temperature‐dependent Constitutive Model

Linvill

Östlund

2016

Packag Technol Sci

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A moisture‐dependent and temperature‐dependent constitutive model for paper materials was proposed and implemented into a finite element model of the paper hydroforming process. Experimental hydroforming was conducted at temperatures of 23°C and 110 °C and moisture contents of 6.9 and 10.6 (respectively corresponding to 50 and 80% relative humidity). The proposed model, which also included the effects of drying, captured the extent of forming of all experimental results within reasonable accuracy. For the moisture content and temperature conditions in this study, the phenomenon of drying was found to be the reason why the application of temperature had a much greater effect on the degree of forming than hydroforming at various moisture contents. A simulation‐based parametric study was conducted in order to identify the importance of various process and material parameters. This parametric study confirmed many previous empirical findings and was capable of quantifying the extent to which these process and material parameters affect the three‐dimensional formability of paper. The coefficient of friction was identified as one of the most important factors when determining the extent of forming. Copyright © 2016 John Wiley & Sons, Ltd.

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Influence of Paperboard Structure and Processing Conditions on Forming of Complex Paperboard Structures

Cited by 35 publications

References 3 publications

Characterization of the material elongation in the deep drawing of paperboard

Characterization of the material elongation in the deep drawing of paperboard

The Elongation Potential of Paper – How Should Fibres be Deformed to Make Paper Extensible?

Parametric Study of Hydroforming of Paper Materials Using the Explicit Finite Element Method with a Moisture‐dependent and Temperature‐dependent Constitutive Model

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