ROADWORKSTE 552 Nonwoven

Product Development

Neslihan Yagmur

Why Geotextiles in Roads?

• Geotextiles are widely used for filtration and separation in road constructions, to prevent migration and mingling of materials, yet allowing free movement of water.

Materials

• Polyethylene terephthalate (PET)• Polypropylene (PP)

Methods

• Thermally bonded• Needlepunched

DuPont™ Typar® SF

• DuPont™ Typar® SF is a thermally bonded nonwoven geotexile, made of 100% polypropylene which is designed to have a combination of – a high initial modulus (stiffness)– high elongation (typically > 50%)– outstanding uniformity

DuPont™ Typar® SF

DuPont™ Typar® SF

• In the fibre extrusion process, thousands of extremely fine, continuous filaments are produced, which pass through a DuPont patented “pre-stretch” stage.

DuPont™ Typar® SF

• These fine but tough filaments are then laid down producing an isotropic fibre web sheet which is then thermally bonded.

DuPont™ Typar® SF Versus Thermally Bonded

• Higher uniformity• Higher elongation• Higher initial modulus

DuPont™ Typar® SF Versus Needlepunched

• Lighter and thinner• Higher initial modulus• Higher damage resistance• Higher filtration properties• Decrease of transport and stocking costs• Easier installation• Do not to soak or to freeze ‘cause of precompressed

structure

DuPont™ Typar® SF “Protection”

Advantages of DuPont™ Typar® SF

• Easy to handle– Easy to carry– Easy to cut

• Easy to install• Simplified in logistics– Pre-compressed

• Large choice of dimensions

Application Areas of DuPont™ Typar® SF

• Blanket drains in roads and sports fields• Temporary roads, access roads, forest roads• Permanent roads, airport runways

Application Areas of DuPont Typar SF

• taxiways, motorways• Car parks, storage yards• Agricultural and pipe drains• erosion control of earth dam• river and lake embankments

DuPont™ Typar® SF Styles

REFERENCES

• A. Watn, G. Eiksund, A. Knutson, Deformations and Damage of Non-Woven Geotextiles in Road Construction, 1998

• http://www.ehow.com/info_7790694_importance-geotextile-materials-road-construction.html

• http://www.fibertex.com/en-GB/business-areas/Geotextiles/Design/Pages/RoadConstruction.aspx

• Technical Handbook of DuPont™ Typar® SF

THANK YOU FOR YOUR ATTENTION