Doubled screens with inside filled in advance, are mainly used in oil, gas and water wells .It has good performance in preventing from the sand after filled with mineral ect; it is a kind of advanced technology. also has great effects in chemical producing and killing bacterium in industry producing by filling a kind of activator or anti-bacterium chemical in the interlayer of screen.

 

Comparing with other screen, it has many advantages: the solid structure, resisting huge temperature and the corruption, the high rate of the opening area, the precise size, long-life safety and the low cost