| 摘要 |
PROBLEM TO BE SOLVED: To shift the meshes of overlapping lattices in unit nets easily, surely and mutually and to slantingly cross the unit nets by selecting the mutual positions between the unit nets so that the meshes of the overlapping lattices of the unit nets to be overlapped are mutually shifted and slantingly crossed in the case of punching a plurality of sheets of unit nets from a sheet of net. SOLUTION: The bubble net comprises a continuous base material 20 punched from a net having numberless meshes of a lattice. The bubble net has a unit net 22 (22a-22c) and a connection part 24 (24a, 24b) connecting the intermediate of the adjacent unit nets 22. In the case of punching the continuous base material 20 such as this, when the base material 20 is bent in the connection part 26 and these unit nets 22 are overlapped, the meshes of the overlapping lattices are slantingly crossed. Therefore, for example, the central point of the net 22a is allowed to coincide with the starting point O and the central point P1 of the net 22b is decided in a first quadrant and the angle of OP1 and the X-axis is made toθ1. Further, the central point P2 of the net 22c is decided in a fourth quadrant and the angle of OP2 and the X-axis is made toθ2. Until the net 22b is brought into contact with the net 22c,θ1 andθ2 are arbitrarily selected.
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