Geotextiles
For the important geotextile sector DiloGroup offers special technology including webforming, bonding, stretching and needling to produce a specific strength ratio.
Geotextiles are brought into the soil either temporarily or permanently to fulfill certains tasks as for example
- Separation (e. g. separation layer under fillings)
- Filtration (e. g. filters for draining)
- Armouring (e. g. erosion protection of banks)
- Protection (e. g. damage protection of layers)
- Draining (e. g. draining installations of traffic routes)
- high permeability
- adjustable pore size
- high isotropic strength
- structural stable and formable
- high tensile strength
- high abrasion forces to the soil
- high endurance strength
Geotextiles are typically produced from polyester and polypropylene fibres in card/crosslapper installations. The card feeder (MultiFeed) forms a very even, compact flock mat of fibre flocks. A belt weigher or a radioactive gauge keep the weight of the flock mat constant. In the card (VectorQuadroCard) the fibres are opened and blended and a web is created.
After the crosslapper the fibres are oriented almost 90° to the running direction (depending on the layering angle). This means the power intake in cross direction would be higher than in longitudinal when needling would take place here. For this reason Dilo has designed the drafting unit (VE) for preneedled felts. Especially at felts with high area weight, this unit reorientes the cross fibres to an almost isotropic fibre distribution. In the subsequent finish needling from top and bottom (OD and UD), the strength is further increased.