PURPOSE: To make it possible to manufacture the first strand portion without rupturing it when an expand metal having a flat plate on its end part is manufactured from merely a raw material having no work such as trimming processed thereon.
CONSTITUTION: By the first expanding motion, a depression 7c is formed by means of an expanding motion pressing an S1 portion down by an upper blade under the condition of leaving a flat plate 7a on the end part of a raw material through which the first bond part S2 is formed. The second expanding motion is performed in the way of pressing the first bond portion S2. In this case, when the raw material is expanded by feeding only a strand width dimension W1, which is wider than the usual strand width W, the first strand portion 7d of a wide width is formed. Because the width W1 of the first strand portion 7d is wide, the strand portion 7d can be expanded to a specified dimensions (1/2 of rather short dimensions) without any rupture. The third expanding motion and thereafter, meshes are formed by expanding in the narrow strand portion width W of the usual mesh part.
NISHINO KATSUTOSHI