With regard to Examples 1 to 11 and the comparative example described as described above, the temperatures of the heating wires at positions indicated by reference signs a, b, and c shown in FIGS. 9A and 9B were measured. Reference sign b indicates the vertex portion of the bent portion, and reference signs a and c indicate points on the linking portion that are located 35 mm away from reference sign b. Also, as for each of the Examples 1 to 18, an average temperature s of the temperatures taken at a and c, the temperature taken at b, and a temperature difference dT therebetween were each calculated. The results are as follows.
TABLE 4
Temperature at b
Temperature Difference dT
Ex. 1
62.8
14.5
Ex. 2
60.9
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