| 摘要 |
A belt unit includes rolls being rotatably supported and a belt to be conveyed by the rolls. In a dynamic viscoelasticity test with conditions of tensile load set in a frequency range of 0.01 to 100 [Hz], the belt unit satisfies 1@G10/G70@3.1, and L70>=10 [MPa]. A storage elastic modulus of the belt at a temperature of 10[° C.] is indicated by G10. A storage elastic modulus of the belt at a temperature of 70[° C.] is indicated by G70. A loss elastic modulus of the belt at a temperature of 70[° C.] is indicated by L70.
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