Production manner null of top board for squarish can and top board for squarish can

摘要

PURPOSE: To form a rectangular top plate which is to be clamped to a rectangular can body, which prevents recesses of the too plates when stacked vertically from fitting into each other and attaching to each other, and which is highly precise. ;CONSTITUTION: A top plate material formed with a clamping recess along an entire periphery of four outer peripheral sides is carried along two parallel guides 7, 8. A protrusion forming jig having a sharp body is made to protrude against the top plate material from a predetermined position of the guide 7, at the same time the rectangular top plate material is pushed toward the guide 8, and the rectangular top plate material is pushed against the sharp body of the protrusion forming jig fixed an a predetermined position of the guide 8, so chat the sharp body on the guide 8 side is made to protrude against the rectangular top plate material. Thus the top plate 16 for a rectangular can having protrusions 14, 15 into a clamping recess on ends 2a, 4a of clamping recesses 2, 4 on two opposite sides of the rectangular top plate material.;COPYRIGHT: (C)1994,JPO