| abstract |
A sheet capable of controlling a quantity of a passing fluid such as air, soil, water (inclusive of brine) or their mixtures, excellent in transparency and durability and having flexibility and high workability, which is obtained by employing a clothed net structure wherein fiber groups A formed in such a fashion that adjacent fibers have slit gaps of at least 0.5 mm and fiber groups B are arranged in a grid form, and the widths of the mesh like gaps encompassed by the fiber groups A and by the fiber groups B are 2 to 15 cm in the direction of arranging of the fiber groups A and in that of the fiber groups B, respectively. |