Taking HDPE as raw material, the ribs of drainage net are extruded from special die head. Every three ribs form 3D structure with drainage channel through fixed gap and angle. the drainage channel among the ribs can afford high load. It can prevent the geo-textile from inbedding the net core and ensure the channel expedites.

the composite drainage net consists of a three-dimensional plastic mesh double-sided bonded water-permeable geotextile, which can replace the traditional sand and gravel layer, and is mainly used for drainage of landfills, roadbeds and tunnel inner walls.

the composite drainage network is a new type of drainage geotechnical material. It is made of high-density polyethylene (HDPE) and processed by a special extrusion process. It has a special structure of three layers. the middle ribs are rigid and longitudinally arranged to form drainage channels. the ribs arranged in the upper and lower crosses form a support to prevent the geotextile from being embedded in the drainage channel, and maintain high drainage performance even under high load. the double-sided adhesive water-permeable geotextile is used in combination, and has the comprehensive performance of "reverse filtration--drainage--breathing--protection", which is the most ideal drainage material at present.