| 摘要 |
PROBLEM TO BE SOLVED: To suppress the elongation of paper at the time of heat fixing of a full-color copying machine and printer of high-speed output and to make image quality higher and speed higher by specifying the breaking length (JIS P-8113) of a cross direction (CD direction) to a specific value or above. SOLUTION: The breaking length (JIS P-8113, 'tensile strength/basis weight') of the cross direction (CD direction) is controlled to >=2.5 Km. Usually, a fixing defect occurs if the paper basis weight increases when the fixing conditions are kept constant. In order to avert the same, the expansion of a nip width and the elevation of a roll temperature give rise to the elongation of the paper. Even if the paper basis weight is made larger and the tensile strength higher in the manner described above, the elongation of the paper cannot be suppressed under the fixing conditions under which the fixing defect do not occur. The breaking length obtained by eliminating the influence of the basis weight from the tensile strength is thereupon adopted, by which the prescribed performance is obtained even if the fixing conditions change. When the breaking length falls under 2.5 Km, the dealing with high output is not possible and the obtaining of the high image quality by suppressing the elongation of the, paper is not possible.
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