About geonets:

• They are generally manufactured by uninterrupted extrusion of matching sets of polymeric ribs at acute angles to one another.
• When the ribs are opened, relatively big apertures are formed into a netlike outline.
• Their outline work is mostly appropriate in the drainage region.
• Geo-nets are made of stacked, criss-crossing polymer strands that provide in-plane drainage.
• Nearly all geo-nets are made of polyethylene.
• The molten polymer is extruded through slits in counter-rotating dies, forming a matrix, or “net” of closely spaced “stacked” strands.
• Two layers of strands are called “bi-planar”.
• Three layers are called “tri-planar”.
• Geo-nets are the most recently introduced members of the geo-synthetic family.
• They are grid-like materials, however, distinct, from geo-grids by virtue of their function.
• They do have considerable strength but are used mostly for drainage purposes.

Product Characteristics:

• The specific gravity of most geo-nets is in the range of 0.935 to 0.942.
• The only other materials in geo-nets are carbon black and a processing package.
• In manufacturing, the ingredients are mixed and passed through an extruder, which injects the melt into a die with slotted counter-rotating segments.
• Over these, the melt flows at angles forming discrete ribs in two planes.
• As pressure forces the semi-solid mass forward, it is pushed over an increasing diameter core, which forces the ribs apart and opens the net.
• Diamond-shaped apertures are formed that are typically 12mm long by 8mm wide.
• Geo-nets are typically 5.0 to 7.2mm thick.
• Thickness is a key factor in determining drainage capability.
• Adding a foam agent to the ingredients can increase thickness of geo-nets.

Raw materials:

• Geo-nets are made of polypropylene (PP) or Polyethylene (PE).

Applications:

• Geo-nets are used almost exclusively for their drainage capability for applications like water drainage behind retaining walls, seeping rock slopes, beneath sport fields, building foundations; leach ate drainage of landfill side slopes, above landfill liners and surface water drainage within landfill caps.

Technology:

• They are generally manufactured by uninterrupted extrusion of matching sets of polymeric ribs at acute angles to one another.