| 摘要 |
PROBLEM TO BE SOLVED: To suppress the generation of wrinkles in envelope, while satisfying self-stripping performance and further, to prevent the wearing of the elastic layer of a fixing roll for prolonging the life. SOLUTION: When a strain in the circumferential direction of the elastic body 3 of the fixing roll 1 on a side coming into contact with the unfixed toner image of a recording material 6 is defined asεh, a strain in the circumferential direction of the elastic body 4 of the other fixing roll 2 is defined asεp andεh-εp is defined asΔε, the relations ofεh>=0.0583(Δε)<4> -0.6(Δε)<3> +2.1917(Δε)<2> -3.65(Δε)+6,εh<6%,Δε<=3% are satisfied.
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