| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a multipurpose three-dimensional net structure which can prevent the invasion of refuses and sludge floated in water and simultaneously permit the passage of small fishes, or can preferentially breed protozoa by adjusting the sizes of the meshes of the net, or can further preferentially collect rare metals floated in water to prevent the invasion of animals and plants. SOLUTION: This three-dimensional net 1 characterized by forming the front and back surfaces of the net from nets in which plural polygonal meshes 1a, 1b are continuously formed, connecting the front surface and the back surface to each other through plural stiff yarns 2 so as to have a prescribed distance, and disposing the front surface and the back surface so that the meshes 1a of the front surface are inconsistently shifted from the meshes 1b of the back surface, when the front surface and the back surfaces are looked from the vertical direction.</p> |
