Effects of press-forming parameters on the dimensional stability of paperboard trays

Niini, Arvo; Tanninen, Panu; Varis, Juha; Leminen, Ville

doi:10.15376/biores.16.3.4876-4890

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…The overall quality of sealed paperboard trays has been linked to the utilised heatsealing and press-forming parameters (Leminen et al 2015a(Leminen et al , 2017. A lower blank holding force in the press-forming process produced more durable paperboard trays for use in food processing compared to previous results (Niini et al 2020a), whereas a higher blank holding force improved the quality of heat-sealed paperboard trays. (Leminen et al 2015a) In a previous study it was found that drying the trays, as compared to preconditioning, improved the durability of press-formed paperboard trays used for food processing (Niini et al 2020b).…”

Section: Introductioncontrasting

confidence: 57%

“…In a previous study, the use of a higher forming tool temperature (180 °C) in the press-forming process of GN1/4 paperboard trays resulted in a smaller difference between the measured widths and the standard tray widths (Niini et al 2020a). The implicated effect from the weight of oatmeal on the width of the tray was due to the tray being loaded with raw oatmeal before the initial dimension measurements; the load of the oatmeal thereby being apparent in the measured tray width.…”

Section: Fig 2 Impact Of Tray Flange Distortion On Tray Widthmentioning

confidence: 84%

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The durability of press-formed paperboard trays – Effects of sealing and drying

Niini

Leminen

Tanninen

et al. 2020

BioRes

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Dimensional measurements were recorded to observe the durability of press-formed paperboard trays used for food processing via heating and cooling of the paperboard trays containing oatmeal. A set of the studied press-formed paperboard trays were dried before being heated, and a set of the paperboard trays were heat-sealed before being cooled to compare the effects of drying and sealing on the durability of the tray. In addition, empty trays were heated to observe the impact of food processing conditions on its durability via leak tests with a colouring solution as well as optical analysis of the material coating on the surface of the trays. The drying process of the trays was observed to improve the dimensional stability of the trays while being heated, and heat-sealing the trays yielded a major positive impact on the dimensional stability of the trays while being cooled. The leak tests and optical analysis results on the heated empty trays showed a negative durability impact from the food processing conditions. It was concluded that adjusting the heat-sealing parameters and food processing conditions is necessary in order to achieve improved durability of the press-formed paperboard trays for food processing purposes.

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Section: Introductioncontrasting

confidence: 57%

Section: Fig 2 Impact Of Tray Flange Distortion On Tray Widthmentioning

confidence: 84%

The durability of press-formed paperboard trays – Effects of sealing and drying

Niini

Leminen

Tanninen

et al. 2020

BioRes

Self Cite

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“…The change in fiber structure can be characterized by subjecting the samples to selected physical and visual analyses. The dimensional stability of press-formed cardboard trays during heating and cooling was investigated in Niini et al (2021). The effect of heat input during folding on paperboard tray stiffness based on compression and torsion tests was evaluated in Niini et al (2022).…”

Section: Introductionmentioning

confidence: 99%

Influence of humidity and temperature on mechanical properties of corrugated board - Numerical investigation

Cornaggia,

Gajewski,

Knitter-Piątkowska

et al. 2023

BioRes

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Paper is a material whose mechanical properties are highly dependent on humidity and temperature, naturally building the relationship between the stiffness and strength of corrugated board and changing weather conditions. In this paper, attention is focused on the dependence of the physical properties of the cardboard on changes in humidity and temperature, which undergo dynamic fluctuations both during the production of corrugated board and during its storage. Two techniques were used to test this effect, namely numerical homogenization and global sensitivity analysis. Both methods were implemented to determine the theoretical relationships between the change in humidity and/or temperature in each layer of corrugated board and its global bending, compression, and shear stiffness. The procedure was used to analyze different types of 5-ply and 3-ply cardboard. The obtained results allowed the authors to build a complete map of the relationship between the change in humidity of selected layers and the strength characteristics of the full assembly.

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Assessing the Effects of Inline Steam Treatment on the Geometric Characteristics of the Thermoformed Plastic‐Coated Fibre‐Based Products

Afshariantorghabeh,

Kärki,

Leminen

2024

Packag Technol Sci

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Thermoforming of fibre‐based materials faces challenges due to their restrictive three‐dimensional formability and lack of compatibility between material properties and traditional thermoforming methods. Treatment techniques present an intriguing area of research to address the gap between material characteristics and process requirements. Therefore, this study examined the influence of inline steam treatment on the thermoforming of plastic‐coated fibre‐based materials with different product geometries. Three plastic‐coated paperboards were subjected to thermoforming, with and without steaming, and their thermoformability was assessed based on the maximum depth and draft angle of the samples. Following 7 s of steaming, the materials exhibited a moisture content 2–4 percentage points higher than that of the original setup, yielding a greater curling rate in the produced samples across different geometries. The curling rate was influenced by the tensile stiffness of the materials and was correlated with the size of the flat‐edge area in the studied geometries. Furthermore, findings revealed varying rates at which steaming affected different geometries. Steaming substantially enhanced the achieved depth for geometries where the material was incapable of reaching the mould without moisturization, particularly observed for smaller geometrical shapes. This improvement was linked to steaming, which enhanced pliability, facilitated material penetration, and increased the final depth. However, in geometries where the material could reach the mould without moisturization, steaming expanded the contact area but could also result in a greater spring‐back rate and reduced depth, potentially owing to the loss of elastic modulus by moisturization. Nevertheless, the rate of spring‐back did not consistently increase with steaming and could be influenced by various material‐related factors, including the properties, composition, preparation methods, and postforming drying. Despite depth changes, steaming consistently improved the obtained draft angles, indicating that the materials were drawn more efficiently to the sidewalls across all instances studied. Thus, this study underscored the importance of choosing appropriate materials and moulds for hydrothermal moisturization treatments in the thermoforming process.

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Effects of press-forming parameters on the dimensional stability of paperboard trays

Cited by 4 publications

References 19 publications

The durability of press-formed paperboard trays – Effects of sealing and drying

The durability of press-formed paperboard trays – Effects of sealing and drying

Influence of humidity and temperature on mechanical properties of corrugated board - Numerical investigation

Assessing the Effects of Inline Steam Treatment on the Geometric Characteristics of the Thermoformed Plastic‐Coated Fibre‐Based Products

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