two rectangular unit pieces for simplicity of illustration also the rectangular unit pieces are arranged such that an island type residue 110 is formed among the adjacent four rectangular unit pieces 200 210 220 and 230 see a circle drawn by an alternated long and short dash line the island type residue 110 is an approximately rectangular shaped residue defined by the respective sides of the rectangular unit pieces this structure is not seen from the array structures of fig1 and 2 at all in the array structure of the rectangular unit pieces as described above the utilization of the base material sheet 100 is greater than that in fig1 preferably the effective width w of the base material sheet 100 is substantially almost equal to the cutting width d also a cutting margin 120 having a size less than that of the island type residue 110 is located between the rectangular unit pieces 200 and 210 which are adjacent to each other at one side of each rectangular unit piece consequently when the rectangular unit pieces 200 210 220 and 230 are cut from the base material sheet 100 the respective rectangular unit pieces are effectively cut as independent unit pieces by the cutters of the cutting frame the fact that the cutting efficiency of the base material is improved by the array structure of.