Fixing rubbing member and fixing apparatus
A fixing rubbing member including a metallic base material having a plurality of first protruded portions on at least one surface, and a resin layer covering a surface of the first protruded portions of the metallic base material, in which the resin layer is provided with a plurality of second protruded portions corresponding to the plurality of respective first protruded portions, on a surface of the resin layer on an opposite side of a side that faces the metallic base material; an apex of at least one of the plurality of second protruded portions is provided with at least one depressed portion; and, when a glass sheet is pressed against the surface of the fixing rubbing member provided with the second protruded portions, at 0.4 MPa, at a temperature of 25° C., a rim surrounding the depressed portion comes into contact with the glass sheet.
1 . A fixing rubbing member comprising:
a metallic base material having a plurality of first protruded portions on at least one surface; and
a resin layer covering a surface of the first protruded portions of the metallic base material, wherein
the resin layer is provided with a plurality of second protruded portions corresponding to the plurality of respective first protruded portions, on a surface of the resin layer on an opposite side of a side that faces the metallic base material,
an apex of at least one of the plurality of second protruded portions is provided with at least one depressed portion, and
when a glass sheet is pressed against the surface of the fixing rubbing member provided with the plurality of second protruded portions, at a pressure 0.4 MPa, at a temperature of 25° C., a rim surrounding the depressed portion comes into contact with the glass sheet.
2 . The fixing rubbing member according to claim 1 , wherein the depressed portion surrounded by the rim has a depth of 1.0 μm or more.
3 . The fixing rubbing member according to claim 1 , wherein the depressed portion surrounded by the rim has an area-corresponding diameter of 20 μm to 600 μm.
4 . The fixing rubbing member according to claim 1 , wherein, when the glass sheet is pressed against the surface of the fixing rubbing member provided with the plurality of second protruded portions, at the pressure 0.4 MPa, at a temperature of 200° C., the rim surrounding the depressed portion comes into contact with the glass sheet.
5 . The fixing rubbing member according to claim 4 , wherein
denoting an average contact area ratio expressed as formula (1) at a temperature of 25° C. as A25, and
denoting an average contact area ratio expressed as formula (2) at a temperature of 200° C. as A200, A25<A200 is established:
[
x
1
/
(
x
1
+
y
1
)
]
×
100
,
(
1
)
where in the formula (1),
x1 denotes an area of the rim coming into contact with the glass sheet at the temperature of 25° C.,
y1 denotes an area of a projection of the depressed portion surrounded by the rim, onto the glass sheet at the temperature of 25° C.,
[
x
2
/
(
x
2
+
y
2
)
]
×
100
,
(
2
)
where in the formula (2),
x2 denotes an area of the rim coming into contact with the glass sheet at the temperature of 200° C., and
y2 denotes an area of a projection of the depressed portion surrounded by the rim onto the glass sheet at the temperature of 200° C.
6 . The fixing rubbing member according to claim 5 , wherein the A200 is twice the A25 or more.
7 . The fixing rubbing member according to claim 6 , wherein the A200 is from 40% to 80%.
8 . The fixing rubbing member according to claim 5 , wherein the A200 is from 30% to 80%.
9 . The fixing rubbing member according to claim 5 , wherein the A25 is from 10% to 50%.
10 . The fixing rubbing member according to claim 1 , wherein
denoting a storage elastic modulus of the resin layer at a temperature of 25° C. as E′(25), and
denoting a storage elastic modulus of the resin layer at a temperature of 200° C. as E′(200),
E′(25) is 2.5 GPa to 4.0 GPa, and
E′(200) is 0.06 times to 0.13 times E′(25).
11 . The fixing rubbing member according to claim 1 , wherein the resin layer includes polyether ether ketone.
12 . A fixing apparatus configured to fix an unfixed toner image carried on a recording medium onto the recording medium, the fixing apparatus comprising:
a fixing rotating member;
a pressing rotating member disposed facing the fixing rotating member and forming a nip portion with the fixing rotating member;
a rubbing member disposed on an inner side of the fixing rotating member, and having a sliding surface enabled to slide on an inner peripheral surface of the fixing rotating member, with a lubricant disposed between the sliding surface and the inner peripheral surface;
a backup member disposed on the inner side of the fixing rotating member, in a manner nipping the rubbing member and the fixing rotating member with the pressing rotating member, and providing backing to the rubbing member;
a heater configured to heat the fixing rotating member, wherein
the rubbing member is the fixing rubbing member according to claim 1 , and is disposed in such a manner that a surface of the fixing rubbing member on a side having the plurality of second protruded portions faces the inner peripheral surface of the fixing rotating member.