JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 51

Fig. 2: STFI's carbon nonwoven technology lab

energy conditions. Compared to the known milling process,
the advantages are reduced fibre damage and therefore possible maximum fibre length, as well as cost efficiency. Woven
and web structures made from carbon filaments can be precut and then processed in a (preferably) one-step recycling
process. The fact that the fibres are less damaged is reflected in
mid-range fibre lengths of about 60 mm, which is still approximately 85% of the pre-cut fibre length.

Technology lab for further research
The tested recycling technology and the carefully adapted web
laying technology have become the foundation of all processing tests at the STFI carbon nonwoven technology lab (Figure
2). For these tests, STFI has a full processing line for carded
nonwovens with a working width of 1 m. This line is designed
to process pure carbon fibres and/or blends with other fibres.
The line also features inline needle-punching and stitch-bonding machinery. In 2015, the technology lab will be extended
with an aerodynamic web laying system with a 1-m working

Fig. 4: Stitch-bonded carbon fibre nonwoven

width and a stand-alone line for the production of fibre tapes
and yarns using recycled carbon fibres.

Outlook
The project work has shown that webs can be formed from
100% primary carbon fibres and from 100% recycled carbon fibres (rCF) via mechanical carding - a technology that
will open up new potential for the industry. With their high
formability and sufficient strength, these carbon fibre nonwovens are highly suitable as semi-finished products for CFRP
structures. A carbon fibre nonwoven (Figure 3) embedded
in an epoxy resin matrix using high-pressure resin transfer
moulding, for example, at a 24% fibre volume generates tensile
moduli of 16 GPa (machine direction) and 31 GPa (cross
direction) as well as a tensile strength of 200 MPa (machine
direction) and 500 MPa (cross direction).
In the future, the main focus will be to optimize the production processes for nonwovens made from recycled carbon
fibres and to get into the market with defined products made
from nonwovens or a combination with other textile structures
(Figure 4). The scope of work will be to increase fibre volume
content in the processed CFRPs made of rCF nonwovens and
to achieve higher tensile moduli and higher tensile strength. n
Acknowledgements
The authors would like to thank the German Federal Ministry of
Economics and Energy (BMWi) for the financial promotion of the
CarbonWasteCycle project under Reg.-No. VF 120003.
References
[1] T. Kraus, M. Kühnel: "Composites-Marktbericht 2014 Marktentwicklungen, Trends, Ausblicke und Herausforderungen",
Veröffentlichung der Industrievereinigung Verstärkte Kunststoffe und des Carbon Composites e.V., Oktober 2014, S. 5ff.
More information:
www.stfi.de
marcel.hofmann@stfi.de

Fig. 3: Needle-punched carbon fibre nonwoven

No98 July - August 2015 /

jec composites magazine 51


http://www.stfi.de

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015

Cover
Edito
Point of view : business development
Contents
COMPANY & BUSINESS
In brief
Cluster
SME
Agenda of Events
APPLICATIONS
Sports & leisure
Safety
Sports & leisure
MARKET
Resins
FEATURE AUTOMOTIVE
Materials
Binder
Additive
CFRP
Epoxy
Hybrid polymer
QSP
CRTP
Rear axles
Tanks
Engines
RESEARCH & DEVELOPMENT
Fractography
Recycling
TECHNOLOGY & INNOVATIONS
Ancillary product
Vision system
Nano
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Cover
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 2
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Edito
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Point of view : business development
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 5
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Contents
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 7
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - In brief
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Cluster
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - SME
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 11
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 12
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 13
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 15
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Sports & leisure
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Safety
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Sports & leisure
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Ad1
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Ad2
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 19
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Resins
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 21
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 22
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Materials
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 24
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Binder
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Additive
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 27
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 28
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 29
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - CFRP
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 31
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Epoxy
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 33
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Hybrid polymer
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 35
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - QSP
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 37
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 38
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - CRTP
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 40
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 41
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Rear axles
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Tanks
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Engines
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 45
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Fractography
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 47
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 48
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 49
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Recycling
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 51
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Ancillary product
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 53
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Vision system
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 55
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Nano
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - Index
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - In the world
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 59
JEC COMPOSITES MAGAZINE - Issue #98 - July/August 2015 - 60
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