LOEWE*-Research Cluster – BAMP!

Building with Paperboard

Within BAMP!, it is the aim to adjust paperboard onto the requirements of the construction industry. As a renewable material, paperboard enables an improved sustainability in construction industry.

*LOEWE – State Offensive for the Development of Scientific and Economic Excellence

Subproject 4 – Manufacturing of three-dimensional shaped paper-based components

Initially issues of different sections like connection, three-dimensional forming, rigidity and environmental resistance have to be solved. Therefore, researchers from the Departments of Paper Technology, Chemistry, Civil Engineering, Architecture and Forming Technology joined their forces in the LOEWE-research cluster in order to qualify paperboard for construction applications. Thereby, BAMP! presents a consortium in the field of paperboard research which is unique in the world (cf. figure [1]).

[1] Consortium and their research focus within BAMP!

Motivation and Objectives of Subproject 4

In the field of construction industry individualized parts became state of the art as façade elements. Currently, the shaping of these elements leads to high investments in tools and plants. In contrast to already existing proceedings for the forming of metallic components, there is no technology for the individualized shaping of paperboard available. Therefore, it is the aim to develop an efficient process chain for an individualized shaping of paperboard. Beside paperboard, sandwich structures will be investigated, since they have a good weight-specific bending stiffness as well as a high noise and heat insulation. However, current sandwich structures have a mineral oil-based core. To reduce the use of limited resources, sandwich structures with a paper-based core and aluminum face sheets will be developed within the subproject 4 to increase the sustainability of sandwich structures. One main aspect of this development is the faultless manufacturing of shaped and cut sandwich structures.

Since the recycling process has a high impact on the sustainability, the separation of the single layers will be also investigated within the project.

Development of a Process Chain for Individualized Shaping

As illustrated in figure [2] the process chain to develop can be divided in three parts.

[2] Process chain to develop within subproject 4

Based on the plane, semi-finished products provided from subproject 3, a basic 3D-shape will be manufactured. With the collaboration of all subprojects a basic shape is specified. Since a high form flexibility and a superimposition of pressure, leading to larger elongation values, a hydroforming tool concept is pursued.

Beside the development of a hydroforming tool concept for the basic shape, the incremental forming is adjusted to the requirements of paperboard forming. Within the process chain it allows to individualize the basic shape or to form unique parts, for which solid tools are too expensive.

After the forming processes the components have to be trimmed. Additionally, connections have to be manufactured by shear cutting or milling. Especially the design of the connections will be treated in close collaboration with the subprojects 5 and 6.

The process design is supported by numerical simulations. Beside the aspect of cost saving, the numerical models will be used to design further processes with different types of paperboard as well as for a better understanding of the effective forming mechanisms. Additionally to the numerical process simulation, experimental methods will be developed to determine the plastic forming mechanisms of paperboard.

Next to the process development, test methods will be investigated with regard to their usability for a non-destructive component testing. Based on former projects, thermography and computed tomography are promising methods. While thermography is primarily useable for large scaled parts, computed tomography enables the detection of small faults on small parts.

Further information about the overall project is available at:

Building with Paper

Acknowledgement

The presented project is part of the LOEWE-Research Cluster BAMP! (Building with Paperboard), which is funded by the German Federal State of Hesse. This financial support is gratefully acknowledged.