Geomembrane production process, what is the difference between blown film and flat extrusion

The blown film and flat extrusion of HDPE geomembrane is like writing in the left hand or writing in the right hand. In fact, there is no essential difference. The only difference is that when producing HDPE geomembrane with rough surface, it can be said in a popular way: the blown film process is a one-step process, the whole process is one-shot, and the production efficiency is higher. At present, more than 80% of the geomembrane production lines in the world use the blown film process. If it is a geomembrane produced by the flat extrusion process, the geomembrane can basically be judged to be an older production line. Because the new blown film process produces a rough surface geomembrane, not only because it is a one-step method, but also has high production efficiency. More importantly, the matte geomembrane rough grain produced by the film is integrated with the membrane and used for slope anti-seepage. More reliable, Since the failure of the slope landslide after the use of the geomembrane in the international process, the large-scale engineering has specified the rough geomembrane produced by the blown film process, which also promoted the development of the blown film process.

If there is no professional testing equipment, the following authentication methods can be used:

1. Pull test： cut 5 cm wide strip on the geomembrane, and then pull hard, good geomembrane elongation 4.5 times will not break.

2. Visual inspection：good geotechnical film is black and bright, shiny, not shiny.

3. Repeatedly rubbing：good geomembrane repeatedly does not crack, poor geomembrane is easy to crack.