Pressure applying rotatable member, having a porous elastic layer with greater thermal conductivities in the axial and circumferential directions than in the thickness direction, and image heating apparatus having the same

摘要

A pressing rotatable member for use with an image heating apparatus including a base layer; and a porous elastic layer provided on the base layer, wherein the elastic layer has a thermal conductivity in an axial direction thereof and a thermal conductivity in a circumferential direction thereof which are not less than 6-times and not more than 900-times a thermal conductivity in a thickness direction thereof.