Controlling the Folding of the Blank in Paperboard Tray Press Forming

Tanninen, Panu; Leminen, Ville; Eskelinen, Harri; Lindell, Henry; Varis, Juha

doi:10.15376/biores.10.3.5191-5202

Cited by 22 publications

(19 citation statements)

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“…The importance of the quality of the tray flange is well known, 3 and the effect of manufacturing process on this quality has also been investigated. [2][3][4] The movement of the male mould in relation to the rim tool is mechanically limited to enable the set distribution of pressing force between the tray flange and the lower part of the tray. The indentation in the bottom of the tray makes it more stable and rigid.…”

Section: Methodsmentioning

confidence: 99%

“…Three-dimensional (3D) forming of paperboard by press forming and deep drawing processes has been studied by several authors. Previous articles describe the effect of process parameters, tooling technology, the adjustability of the processes, [1][2][3][4] and material behavior in the forming processes. [5][6][7][8] The requirements set by the forming process, such as the dwell time and the tool heating, have been previously studied by Tanninen et al, 9 and the optimization and design of forming tools have also been investigated extensively.…”

Section: Introductionmentioning

confidence: 99%

“…1. 2,4 The mould set consists of 3 main parts: a male mould, a female mould, and a rim tool (a blank holder).…”

Section: Introductionmentioning

confidence: 99%

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Process cycle optimization in press forming of paperboard

et al. 2017

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Three-dimensional forming of paperboard is commonly done by a press forming process, which has been widely researched. However, the process cycle of the press forming of paperboard trayshas not yet been completely optimized due to limited adjustability and unsophisticated mechanical structure of commonly used forming equipment. The object of this study is to optimize the force curve of stroke to improve product quality without compromising the production rate using LUT Adjustable Packaging Line prototype for practical evaluation of formability and multibody dynamics software MSC Adams for simulation. Several process parameters were investigated with different process cycles to study their effect on the quality of the formed products. With optimized male mould speed, acceleration and speed of the blank could be reduced, which led to significantly reduced rupturing tendency without compromising the production speed. It was also found that a constant blank holding force should be used to achieve acceptable tray quality, although this results in a significantly increased surface pressure applied to the formed substrate.It was also discovered that a novel male mould attachment, which included a pressing force adjustment system that utilized a spring set with an adjustable preload, made it possible to control the force distribution between different forming tools during the dwelling phase of the process cycle in an improved way. Utilization of the method used in this paper leads to a better tray quality without compromising the production efficiency. Furthermore, this can increase the number of possible package applications for sustainable materials, such as paperboard.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Process cycle optimization in press forming of paperboard

et al. 2017

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“…Pressmolding is typically performed with forming ratios in the range of 0.3 to 0.4 using commercial board grades (Tanninen et al 2015). This process works with mechanical tools.…”

Section: Introductionmentioning

confidence: 99%

Advances on Geometrical Limits in the Deep Drawing Process of Paperboard

Hauptmann¹,

Kaulfürst²,

Majschak³

2016

BioResources

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The geometrical limits of the deep drawing process of paper to advanced shapes are not known. This report examines the technological limits of convex elements of the base shape in relation to the drawing height and shows the material behavior in the bottom radius of 3D shapes with regard to special material properties. In the bottom radius, non-compressed wrinkles occurred due to the in-plane compression, but wrinkles were reduced by an increased blank holder force or tool temperatures and improved extensibility or in-plane compressive strain. The forming ratio during deep drawing (drawing height related to base diameter) was increased to a value of more than 1 by a blank holder force, which increased with the drawing height such that the initial blank holder force was reduced concurrently. Straight sections in the base shape reduced the risk for ruptures in the edge radii of rectangular shapes, producing a forming ratio in these radii of 2.5. The forming ratio was further supported by a pattern of creasing lines at the blanks with a radial orientation and a number near the expected maximum number of wrinkles. The spring-back at rectangular shapes mainly depended on the drawing height and edge radius.

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“…The long‐known press‐moulding process, in which a male mould presses the material into a female mould while a blank holder applies a force to the rim, has also been improved in the recent past by more intensive scientific work. The investigations into mould clearance and creasing‐line patterns used to control the wrinkling which appears in convex radii at the bottom geometry provide a guideline on how to work successfully with this technology without rupturing the material. Furthermore, the produced cups were proven to be applicable for modified atmosphere packaging (MAP) because they were sealed gastight without leaks at the sealing rim or in the wrinkled areas …”

Section: Introductionmentioning

confidence: 99%

Examination of the Transferability of Technological key Features of Paperboard Deep Drawing Towards the Application in Fast‐Running Packaging Machines

Hauptmann

Kustermann²,

Schmalholz³

et al. 2016

Packag Technol Sci

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The deep-drawing process of paperboard has experienced essential improvement in the recent past; however, the technological advancements have not been transferred to packaging machines yet. Two of the most important issues with regard to the reliable production of high quality 3D shapes are the use of elevated moisture and defined blank holder force profiles. This paper examines a roll preparation method for applying additional water to the paperboard and analyses a spring-loaded blank holder solution with regard to its achieved accuracy and reliability of the force characteristics. A two-sided roll application of water on the paperboard using a sponge rubber cover on one of the rolls produces a water intake of up to 12%. The effect of moisture applied by roll preparation is higher compared to conditioning under controlled climate conditions, and the preparation time is reduced to a few seconds. The spring-loaded blank holder introduced in the paper completely works in position control and avoids the switch over to force control as well as the problem of small position steps, which were necessary during force control. A harmonic oscillation of the blank holder while the material is drawn out of it could not be observed up to an output of 150 cycles per minute. An application of a roll-based moisturization unit and a spring-loaded blank holder force in modern packaging machines appears feasible and favourable according to the results of this paper and maintains the capabilities of this 3D forming technology to a large part.

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Controlling the Folding of the Blank in Paperboard Tray Press Forming

Cited by 22 publications

References 0 publications

Process cycle optimization in press forming of paperboard

Process cycle optimization in press forming of paperboard

Advances on Geometrical Limits in the Deep Drawing Process of Paperboard

Examination of the Transferability of Technological key Features of Paperboard Deep Drawing Towards the Application in Fast‐Running Packaging Machines

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