Drainage board is a geosynthetic product mainly made of polypropylene or high-density polyethylene, and its surface is covered with thermally bonded long fiber non-woven geotextile.

The plastic protective drainage board is made of HDPE/EVA/EPS as the main raw material, and the special extrusion process is used to form a columnar and semi-conical shell with closed protrusions, forming a kind of membrane and shell with continuous three-dimensional space and a certain supporting rigidity, and liquid and gas can flow and excrete in it.

The top surface of the conical protrusion is bonded with a layer of filter geotextile to prevent the passage of soil particles, thereby avoiding blockage of the drainage channel and ensuring smooth drainage of the hole. The traditional drainage method uses bricks and tiles as the filter layer, uses more pebbles or crushed stones as the filter layer, and discharges water to designated locations.

Drainage Cell with Geotextile is a lightweight board formed by heating and pressing high-density polyethylene (HDPE) or polypropylene (PP), which can not only create a drainage channel with a certain three-dimensional space support stiffness, but also store water.

The composite drainage board has three special structures. The middle ribs are rigid and arranged longitudinally to form a drainage channel. The composite drainage Flat noodles of the ribs arranged crosswise up and down forms a support to prevent the geotextile from embedding into the drainage channel, and can maintain high drainage performance even under high loads.