The effect of tool heating arrangement on fibre material forming

Tanninen, Panu; Kasurinen, Marko; Eskelinen, Harri; Varis, Juha; Lindell, Henry; Leminen, Ville; Matthews, Sami; Kainusalmi, Mika

doi:10.1016/j.jmatprotec.2014.03.001

Cited by 28 publications

(27 citation statements)

References 7 publications

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“…Tool heating and its effects on the tray quality and dimensions have been reported earlier. 9,10 The blank is die-cut so that the longer side of the blank is parallel to the MD (machine direction) of the paperboard to give the ready-made trays more rigidity due to non-uniform.…”

Section: Methodsmentioning

confidence: 99%

“…[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. 2,10,11 Investigations to predict and analyze the failure of material in forming of paperboard have also been done by Linvill and Östlund 8 and Wallmeier et al 12 The process optimization of manufacturing processes has been done for traditional manufacturing processes, such as sheet metal forming, 13,14 but the optimization of the process cycle in the press forming to improve the quality and production speed has not received wide attention in previous studies with paperboard. However, there is increasing interest in this field, as shown in recent work by Hauptmann et al, 15 which analyzed a novel spring-loaded blank holder mechanism in high speed production of deep drawn paperboard products.…”

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%

Process cycle optimization in press forming of paperboard

et al. 2017

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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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“…In fact, it has been claimed that the strain-at-break of paper can increase by 20% if the moisture content of the sample is increased from 6% to 14% (Linvill and Östlund 2014), and this change is related to alterations within the fiber wall and bonds between the fibers due to a variation in the amount of free water . The effect of several process-related parameters such as mold clearance (Leminen et al 2013) and heating arrangement (Tanninen et al 2014a) on the material performance in forming have been studied. The quality of formed trays is affected by the forming velocity, but it seems that the optimal velocity must be determined for each material separately (Leminen et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Utilization of Production-scale Machine in Experimental Fiber Material Convertibility Testing Using a Novel Press-forming Tool Set

et al. 2017

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The convertibility of paperboard in a press-forming process was studied using a novel type of tool set that allows forming of small substrates such as laboratory handsheets (i.e. experimental materials) to investigate the role of mold design on substrate-press-tool interaction. The tool set makes it possible to prepare rectangular trays in both sliding and fixed blank modes in a pilot-scale press-forming machine. The tests showed that the fixed-blank mode makes it possible to estimate the elongation of the substrate in the forming process by determining the maximum forming depth for rupture-free samples. A more detailed inspection with an optical microscope of grid-patterned materials revealed that elongation took place mostly on the rim area in addition to the tray wall, and that the outer dimensions of the blank remained practically unchanged. The behavior of the material in press forming process was evaluated in addition to the novel tool set in a bigger, production-scale mold, and results showed good agreement between the small tool set and the standard mold, in spite of the dimensional differences. The smaller size of the mold did not require a compromise in any aspect of the press-forming process.

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The effect of tool heating arrangement on fibre material forming

Cited by 28 publications

References 7 publications

Process cycle optimization in press forming of paperboard

Process cycle optimization in press forming of paperboard

Characterization of the material elongation in the deep drawing of paperboard

Utilization of Production-scale Machine in Experimental Fiber Material Convertibility Testing Using a Novel Press-forming Tool Set

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