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Abstract

According to the present invention, n (n=S is a positive integer) pieces of interrupting grids (22.sub.-1, 22.sub.-2, 22.sub.-3, - - - , 22.sub.-(n-1) and 22.sub.-n) are provided, each of the interrupting grids encompasses P pieces of narrow cut-off canals arranged in parallel. The both side of each of the narrow cut-off canals are concaved so that the narrow cut-off canal has a waisted-mortar shape. The waisted-mortar shape is delineated by m pieces of elliptical holes (Q.sub.1, Q.sub.2, Q.sub.3, - - - , Q.sub.m-1 and Q.sub.m (m=P-1 is a positive integer)) arranged adjacently in parallel and semi-elliptical holes (cut ID portions) provided on both sides the alignment of elliptical holes. Then, n pieces of the interrupting grids 22.sub.-1, 22.sub.-2, 22.sub.-3, - - - , 22.sub.-(n-1) and 22.sub.-n are arranged in series through jointing zones (heat-radiation zones) (21.sub.-1, 21.sub.-2, 21.sub.-3, - - - , 21.sub.-(n-) and 21.sub.-n) having a length of 2.5 millimeters or less measured in the series direction. A thickness of each of the interrupting grids is t.sub.H=10-60 micrometers, and a thickness of each of the jointing zones (heat-radiation zones) is t.sub.R=80-150 micrometers.

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