Needle punched geotextile is one of the most important in the development of non-woven geotextila being, in actual fact much older than woven “plastic cloths.” They generally utilize layers of fibre with very similar approach to that used to make carpets. The individual needles create the entrapment required among the various layers. This manufacturing process produces geotextilecloths with high permeability and wonderful filtration characteristics. Depending upon the type of fibre used and its density there can be a great variation in the choosing. In addition production of these geotextiles is generally on the basis of weight. ie. often 100560 gsm but can range from a few grammes up to 1000 or more, where the resultant material is woven. In general, the heavier cloths have higher CBR and are used for more arduous applications. Raw materials are important, generally polyprop polyesters are used, producing a very strong and “plastic” product. Have great resistance to penetrating “bulldogging” types. Generally used as a “drainage” soil separator.Needle Punching: Barbed needles continuously punch through the web, entangling the fibers to produce a dense, non-woven fabric.
Thermal or Mechanical Finishing: Some needle-punched geotextiles are heat bonded and prepared by calendaring. This is done to give them the necessary dimensional stability and strength.
This results in a product which is strong and flexible and will not tear when stressed. It is therefore ideally suited to civil engineering applications.
Properties of Needle-punched Geotextile
It pays dividends to know a little about the properties of needle-punched geotextile so you can select the proper type for your project. The main qualities include:
High Tensile Strength. Needle-punched geotextiles can stretch a long way before breaking so are ideal for soil stabilization and reinforcement work.
Excellent Filtration and Drainage. Gaps in the fibre allow water but not particles to pass and is therefore popular for this application, as with road construction and landfill, to mention two.
UV Resistance. These allow sunlight for a time to be shone upon them during installation; this should not cause any problems in future performance of the product.
Puncture & Tear resistance. With a high CBR puncture strength, needle-punched, robust products may be walked upon and should be capable of supporting sharp instruments or heavy loads without damage.
Chemical and Biological Stability. Both “polypropylene” and “polyester” occur in these geotextiles of fibre which are not subject to microbial attack or chemical corrosion in most cellar sites/environmental conditions.Needle-punched geotextile is used in a variety of applications. Some of the most common methods include:
Road Construction: Used in projects where highways, railroads, and airport pavements. Known as a separation layer between the subgrade and aggregate, this is used to prevent the mixing of soil, improving the distribution of the load, and preventing rutting and settlement.
Erosion Control: Used to protect embankments and slopes, this geotextile holds soil in place and allows drainage of water. Without being held tight by the fabric, soil would erode down hillsides or be susceptible to landslides.
Drainage Systems: Used in French drains, behind retaining walls, and in subsoil, this fabric promotes the drainage of fine particles while allowing water to flow through and reducing the build-up of water pressure that causes damage to drainage systems and substructures.
Landfills: Where landfill lining systems are used, needle-punched geotextiles help to protect them from punctures by sharp waste, enhance stability, and support the overall integrity of the lining system.
Landscaping and Garden Applications: Used in garden paths and driveways, needle-punched geotextiles provide surface separation for soil layers and improve drainage of water. A variety of other landscaping qualities are important. They are resistant to tearing and degrading, making sidewalks and garden paths last longer, and vegetation grow with the use of proper drainage.
Hydraulic Engineering: These are used for riverbank and coastal engineering applications, and hold off soil erosion from water flow and waves in order to prolong the life of the embankments or other shoreline structures.
Why Choose It?: Compared to other kinds of geotextile fabrics, needle-punched ones represent a happy medium of flexibility, strength, and other important qualities, including permeability. For infrastructure projects, this type of fabric can manage heavy loads while still allowing water to flow, making them a valuable asset, one of the top geotextiles available for use now. With the use of PP and PET, these products can last a long time (though still reliant on proper installation techniques).
Needle-punched geotextile is an important aspect of substitute materials on the job site, used in drainage, geotextiles, and a host of other important applications that require special cloth-covered fabric.