08. May 2023

A fibre composite made from biopolymers

A fibre composite made from biopolymers

In collaboration with the project partners CG TEC, Cordenka, ElringKlinger, Fiber Engineering, and Technikum Laubholz, the DITF (Denkendorf , Germany) are developing a new fibre composite material (CELLUN) with reinforcing fibres made of cellulose.

The matrix of the material is a thermoplastic cellulose derivative that can be processed using industrial processing methods such as hot pressing or pultrusion. Cellun made from renewable biopolymers enables the replacement of glass or carbon fibres in the production of industrial moulded parts.

Organosheets are increasingly being used within the fast-growing segment of lightweight fibre composite construction. Organosheets are pre-consolidated semi-finished sheet products with a matrix of thermoplastics and various reinforcing fibres in a wide variety of textile designs. The thermoplastic matrix allows the organosheets to be processed using industry-established "fast" processes such as hot pressing, thermoforming, injection moulding with organosheet inserts, or pultrusion. The processes produce highly recyclable, highly functionalized components with reproducible quality.

The textile reinforcement of organosheets consists mainly of glass, carbon, basalt, or aramid fibres. These fibres have high stiffnesses and tensile strengths but are energy-intensive to manufacture and recycle and can only be recycled in an increasingly low-grade condition.

In contrast, the Cellun composite developed at DITF is a much more sustainable alternative. For the production of Cellun, the reinforcing component is combined from non-fusible cellulose fibres as well as thermoplastic derivatized cellulose fibres as matrix to form a hybrid roving. The cellulosic reinforcing fibres used are regenerated fibres from the company Cordenka and the HighPerCell® cellulose fibres developed at DITF.

Cellun is now being further developed to industrial maturity as part of a joint project funded by the German Federal Ministry of Economics and Climate Protection (BMWK). The tasks of the DITF in the CELLUN joint project are primarily the production of suitable cellulose-based reinforcing fibres and the embedding of the fibres in the thermoplastic cellulose derivative matrix. The material is further processed in the in-house pilot plants into technical hybrid rovings and hybrid textiles. Using pultrusion and thermoforming processes or injection moulding, moulded parts can finally be produced that illustrate the technical application possibilities of the new material.
In the further course of the project, the focus will be on the complete recycling of the CELLUN material after the end of life (EOL). Two different approaches are being researched for this purpose. On the one hand, it is possible to thermally reshape Cellun moulded parts without any loss of quality. A second possible approach is to chemically separate the Cellun material into its individual components again. These can then be used again 100 % as new starting materials.

The novel Cellun materials will offer a real advantage in the market for semi-finished technical products as an environmentally friendly, resource-conserving and cost-effective alternative to established composites in the lightweight construction and automotive sectors. By using renewable biopolymers, Cellun will make a significant contribution to environmental and climate protection: on the one hand, conventional crude oil-based plastics can be substituted, and on the other hand, Cellun reinforcement and matrix fibres can be produced with only low energy input and from natural raw materials. AT


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