Nitrogen Roughening Technology for Rough Surface Geomembrane

Nitrogen Roughening Technology for Rough Surface Geomembrane

The nitrogen roughening process is a technology used to produce rough geomembranes. The following is a detailed introduction to the nitrogen roughening process:
1. Working principle
The nitrogen roughening process is to directly blend nitrogen with the PE (polyethylene) geomembrane raw material, and then enter the different flow channels of the multi-layer co-extrusion die together with the ordinary layer of PE geomembrane raw material for co-extrusion molding. During the extrusion process, since the rough surface layer contains nitrogen, the melt will form uneven rough protrusions due to the release of nitrogen at the moment of exiting the die head, thus forming a rough surface.
2. Process characteristics
One-time molding: The nitrogen roughening process is similar to the chemical foaming roughening method. Both belong to the one-time molding process and can be used for continuous production of the blow molding process.
Controllable rough surface height: By adjusting the air pressure and airflow direction during the blow molding process, the rough height of the rough film can be controlled to meet different construction standard requirements.
Increase friction: The rough surface of the rough geomembrane increases the friction with the slope or other materials, improves the anti-slip performance, and is suitable for projects with difficult construction, such as vertical anti-seepage, steep slope anti-seepage, etc.
3. Application and Advantages
Engineering Application: Rough geomembrane is more suitable for projects with high construction difficulty, such as vertical anti-seepage wall, steep slope anti-seepage, etc., which can increase the safety and stability of the project.
Enhance the composite effect: The roughened needle-punched geotextile and polyethylene geomembrane are heated and bonded by far-infrared drying room, and the composite body formed has stronger anti-seepage performance.
Improve anti-slip performance: The rough protrusions on the surface of the rough geomembrane increase the friction, improve the anti-slip performance, and help ensure construction safety.
4. Precautions
Raw material ratio: During the production process, the raw material ratio needs to be strictly controlled to ensure the quality of the rough geomembrane.
Temperature control: When compounding the needle-punched geotextile with the polyethylene geomembrane, the temperature of the drying room needs to be controlled to avoid the finished product being not firmly compounded or excessively compounded, resulting in damage to the polyethylene film.
Rough surface height control: The height of the rough surface needs to be adjusted according to the construction requirements to meet the engineering requirements.
5. Comparison with other processes
Compared with the spraying roughening process, the nitrogen roughening process will damage the surface of the geomembrane during the production process, resulting in relatively low fracture strength. The roughening process is to first produce a smooth geomembrane, and then use special equipment to spray plastic filaments on the smooth film to increase the friction of the film. Since the surface of the film is not damaged, the strength of the roughening geomembrane is higher. Compared with the point roughening film, the rough surface formed by the nitrogen roughening process is more uniform, but the point roughening film is formed by the extrusion and cooling of special steel rods during the production process, and the point protrusions are also higher.

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