Elastic roller with needle-shaped filler and fixing device

摘要

An elastic layer includes a needle-shaped filler and a void and has a porosity of 20 vol % or more and 60 vol % or less. The elastic layer contains a first area and a second area. The first area extends from a surface of the elastic layer opposite to a surface facing the mandrel toward the mandrel and has a thickness of 30% of the thickness of the elastic layer. The second area is a central area in a thickness direction of the elastic layer and has a thickness of 40% of the thickness of the elastic layer. The needle-shaped filler in the second area has an orientation degree of 50% or lower. The needle-shaped filler in the first area has an orientation degree higher than that of the needle-shaped filler in the second area.

主权项

1. An elastic roller comprising:
a mandrel; and an elastic layer provided on the circumferential surface of the mandrel, the elastic layer containing a needle-shaped filler and a shell-less void and having a porosity of 20 vol % or more and 60 vol % or less, the elastic layer containing a first area and a second area,
the first area extending from a surface of the elastic layer opposite to a surface facing the mandrel toward the mandrel and having a thickness of 30% of the thickness of the elastic layer,the second area being a central area in a thickness direction of the elastic layer and having a thickness of 40% of the thickness of the elastic layer, wherein, an orientation degree of the needle-shaped filler in the second area is 50% or lower, and an orientation degree of the needle-shaped filler in the first area is higher than that in the second area, where, the orientation degree is a percentage ratio of the number of the needle-shaped filler in the longitudinal direction of the elastic layer to the number of total observable needle-shaped filler.