Disposable wearing articles and a seam welder used to form the same

A plurality of disposable wearing articles each comprising:

• a pair of seam arrays comprising a plurality of intermittently arranged seam-welded regions, wherein
• said seam arrays of different said disposable wearing articles include said seam-welded regions in a plurality of different patterns so that the disposable wearing articles are identifiable one from another,
• in each of the seam arrays,
• said seam-welded regions are arranged in a plurality of rows in a transverse direction of the seam array and a plurality of columns in a longitudinal direction of the seam array,
• at least one of said seam-welded regions surrounded by (i) an outermost column and (ii) an outermost row is omitted, and
• a location of the omitted seam-welded region varies from one of said disposable wearing articles to another.

A plurality of disposable wearing articles each comprising:

• a pair of seam arrays comprising a plurality of intermittently arranged seam-welded regions, wherein
• said seam arrays of different said disposable wearing articles include said seam-welded regions in a plurality of different patterns so that the disposable wearing articles are identifiable one from another,
• in each of the seam arrays, said seam-welded regions are arranged in a plurality of rows in a transverse direction of the seam array and a plurality of columns in a longitudinal direction of the seam array,
• in each of the wearing articles, said seam arrays are aligned in the longitudinal direction thereof, and
• the number of the seam-welded regions in a second row among the plurality of rows of said seam arrays varies from one of said seam arrays to another to define the plurality of different patterns of different said disposable wearing articles.