JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 50

SOLUTlONS sustainability

Fig. 7: Cork's cellular structure

Fig. 6: Sound absorption coefficient of rice husk compared to conventional materials such as rubber and wood

Fig. 8: Absorption coefficients for different thicknesses of a cork panel for insulation applications

used for acoustic and/or thermal insulation [3].
As shown in the previous
chart, kenaf and hemp fibres
have a low density and their
acoustic insulation properties
are similar to those of conventional materials such as glass
wool or polyester fibre.
Moreover, the above-mentioned vibration modes in
natural fibres mitigate acoustic
energy, turning them into

50

better materials for absorbing
low frequencies.
Other types of agricultural
waste have excellent acoustic
insulation properties.
One example is rice husk,
which shows a high sound
absorption capacity at low
frequencies compared to other
natural fibres and conventional materials such as glass or
polyester wool, as shown in
Figure 6 [4].
This makes rice husk a good

jec composites magazine / N°122 July 2018

solution for developing panels
in combination with other
natural fibres, and also for
reducing noise in a wide range
of sound frequencies.
At the beginning of this paper,
cork was mentioned as another renewable material with
excellent acoustic properties
[5].
Cork is one of the most versatile natural materials known
today.
It is light, with a density

Tab. 2: Thermal properties of natural
materials and traditional insulating
materials

Material

Thermal
conductivity
(W/mK)

Expanded
polystyrene

0.031

Rice husk

0.036

Cellulose

0.037

Cork

0.039

Hemp

0.040

Flax

0.040

Glass wool

0.040

Coco fibre

0.043

Kenaf

0.044

Sheep wool

0.044

Rock wool

0.045

Wood wool

0.065

ranging between 40 and 100
kg/m³, elastic and waterproof
to gases and liquids, imperishable and has good electrical,
thermal, sound and vibration
insulation properties. It is also
a dielectric material.
As a cellular material, it has
unique properties due to its
close-cell structure, as shown
in Figure 7.
The acoustic properties of
cork result from the gaseous
components enclosed in small



Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #122 - July 2018

Cover
Edito
Opinion: Bringing expertise on board
Contents
NEWS
In brief
Announcement at OC
Agenda
BUSINESS
Trends - Overview of the global carbon composites market Simulation
Market - Attractive growth opportunities for composites in the transportation market
MANUFACTURING
Fibre placement - Fibre placement on-line monitoring and solutions for quality optimisation
Fibre placement - Repurposing residual AFP tape for complex aerospace parts
Monitoring - Overcoming the complexities of RTM
Joining process - Filament winding for automated joining of lightweight profiles
Aerospace - Are thermoplastics essential to the future of composites in aeronautics?
Thermoplastic - Full out-of-autoclave thermoplastic welded airframe
Thermoplastic - Thermoplastic composites are vital to drive aerospace build rates
UAV - The Dash X unmanned aerial vehicle
Nano-satellite - Successful mission of TuPOD, a TubeSats deployer manufactured via additive manufacturing
Manufacturing - Orbital ATK and Lockheed Martin celebrate F-35 programme milestone
Light aviation - A “one shot” aircraft to revolutionize the light aviation sector
Research - An aeronautics and space-oriented research group
SOLUTIONS
Sustainability - Agricultural waste for thermal and acoustic insulation in construction
Recycling - Natural fibres and recycled rubber: new alternative solutions for composite panels
Artistic vases - Art FRP, an innovation based on the Japanese traditional sense of beauty
In the world
TECHNOLOGY
Nanotubes - Conductive glass fibre products using single-wall carbon nanotubes
Simulation - Optimizing the key manufacturing parameters of the AFP process
Index
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JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 68
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Cover
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 2
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Edito
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Opinion: Bringing expertise on board
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 5
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Contents
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 7
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - In brief
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 9
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Announcement at OC
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 11
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 12
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Agenda
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Trends - Overview of the global carbon composites market Simulation
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 15
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Market - Attractive growth opportunities for composites in the transportation market
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 17
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Fibre placement - Fibre placement on-line monitoring and solutions for quality optimisation
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 19
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 20
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Fibre placement - Repurposing residual AFP tape for complex aerospace parts
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 22
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Monitoring - Overcoming the complexities of RTM
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 24
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Joining process - Filament winding for automated joining of lightweight profiles
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 26
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Thermoplastic - Full out-of-autoclave thermoplastic welded airframe
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 28
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 29
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Thermoplastic - Thermoplastic composites are vital to drive aerospace build rates
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 31
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - UAV - The Dash X unmanned aerial vehicle
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 33
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Nano-satellite - Successful mission of TuPOD, a TubeSats deployer manufactured via additive manufacturing
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 35
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 36
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 37
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Manufacturing - Orbital ATK and Lockheed Martin celebrate F-35 programme milestone
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Light aviation - A “one shot” aircraft to revolutionize the light aviation sector
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 40
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Research - An aeronautics and space-oriented research group
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 42
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 43
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 44
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 45
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 46
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 47
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Sustainability - Agricultural waste for thermal and acoustic insulation in construction
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 49
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 50
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 51
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 52
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Recycling - Natural fibres and recycled rubber: new alternative solutions for composite panels
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 54
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 55
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Artistic vases - Art FRP, an innovation based on the Japanese traditional sense of beauty
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 57
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 58
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - In the world
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Nanotubes - Conductive glass fibre products using single-wall carbon nanotubes
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 61
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 62
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Simulation - Optimizing the key manufacturing parameters of the AFP process
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 64
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 65
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Advertisers
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 67
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