Our latest range of thermoplastic nonwovens, which includes
materials such as PPS (polyphenylene sulfide), PEI
(polyetherimide), PEEK (polyether ether ketone) and polyimide
offers ideal compatibility with thermoplastic resin systems as well
as delivering properties such as high temperature resistance or
interlaminar toughness in composites. As with all products in
our Optiveil® and
TFP's thermoplastic materials demonstrate excellent resin uptake
and are compatible with most resin systems, making them suitable
for use in all common composite fabrication techniques.
- High temperature resistance
- Flexible pre-forms
- Ideal compatibility with thermoplastic resin systems
- Excellent resin uptake
Areal weight: 4 g/m²
up to 200 g/m²
Cross-linked polyester and polyester
- Lightweight Optiveil®veils
can be used as carrier or support for materials such as
- Lightweight thermoplastic veils can also improve interlaminar
fracture toughness in composite structures, this is discussed in
more detail below.
- Veils made using precise blends of thermoplastic with carbon or
glass fibre can be manufactures to generate a thermoformable
- Thermoplastic pre-forms utilising the combined attributes of
flexibility and ease of processing offer the capability to produce
complex shapes without advanced tooling systems.
Focus on improving interlaminar fracture
Fibre reinforced composites,
comprising of a layup of carbon reinforcement fabrics infused with
epoxy resin, can exhibit low fracture toughness. In service these
composite materials can be prone to interlaminar failure under both
Mode-I and Mode-II loadings or in scenarios such as tool dropping
(during maintenance) when the composite experiences out-of-plane
low energy impact. the presence of interlaminar damage can be very
detrimental to the delamination fatigue properties of a fibre
reinforced composite and ultimately compromise the mechanical
performance of the structure.
Recent studies using our nonwovens have reported a proven
increase in the interlaminar fracture toughness of a composite. The
improvement is achieved by interleaving our lightweight
thermoplastic veils between the reinforcement plies and then
infusing the structure with resin. We have developed an extensive
range of thermoplastic veils with this specific purpose in mind;
these include Polyimide, Polyether ether ketone (PEEK),
Polyphenylene sulfide (PPS), Poly etherimide (PEI) and Polyester.
The studies have measured the effect of interleaving various veil
types, relative to a control, for both Mode-I and Mode-II testing.
The data, summarized overleaf, demonstrates that a significant
improvement in the interlaminar fracture toughness can be
Data from these recent studies
indicate that interleaving TFP's thermoplastic veils can engineer a
significant improvement in the Mode-I and particularly Mode-II
fracture toughness, for the latter an improvement of up to 350%
& 430% (for intiation & propagation respectively) can be
achieved. The veil type used dictates the level of improvement
observed, PEEK and PPS are the most effective, but other
thermoplastic veils can be selected based on the performance
The data is taken from: V.A. Ramirez, P.J. Hogg, W.W.
Sampson - The influence of the nonwoven veil architectures on
interlaminar fracture toughness of interleaved composites,
Composites Science and Technology 110 (2015) 103-110.
Our veils and mats are available in rolls from as narrow as 5 mm
up to 1650 mm in width. We also offer the capability to supply
materials in sheeted form or as cut shapes. Please contact us
to learn more our materials and capability, we would welcome the
opportunity to discuss your specific requirements.