Charging device, process cartridge, image forming apparatus, and toner
A cleaning roller cleaning a surface of a cleaning component, wherein the cleaning roller is provided in a roller configuration having a cylindrical shape and has a portion in contact with the cleaning component, the portion being made of a melamine resin foam having a continuous foam structure, the melamine resin foam being provided by heating compression from an original configuration in a radial direction, and wherein the portion in contact with the cleaning component has a continuous foam structure and a tensile strength in a range of 1.7±0.5 kg/cm 2 , and an image forming apparatus incorporating the same.
1. A cleaning roller that is configured to make contact with a surface of a target member to be cleaned, the cleaning roller comprising:
a core body;
a melamine resin foam that is configured to be provided on a peripheral surface of the core body and make contact with at least the surface of the target member;
wherein the melamine resin foam is formed into a roller configuration; and
wherein the cleaning roller is obtained after the melamine foam is compressed with heating from an original shape in a radial direction of the cleaning roller so as to have a tensile strength of the melamine resin foam in a range of 1.7±0.5 kg/cm 2 .
2. The cleaning roller according to claim 1 , wherein a compressibility of the melamine resin foam is 30 ± 15 % from the original shape in the radial direction.
3. The cleaning roller according to claim 1 , wherein the melamine resin foam including a continuous foam structure and a density in a range of from 5 to 15 kg/m 3 .
4. The cleaning roller according to claim 1 , wherein the target member is a charging roller.
5. The cleaning roller according to claim 4 , wherein the cleaning roller is provided to be rotated with a rotation of the charging roller.
6. The cleaning roller according to claim 1 , wherein the melamine resin foam includes a continuous foam structure and an rate of elongation in a range of 20 to 40%.
7. An image forming apparatus comprising:
an image bearing member;
a developing device;
a cleaning device; and
a charging device including a charging roller and a cleaning roller that is configured to make contact with a surface of the charging roller;
wherein the cleaning roller includes a core body and a melamine resin foam that is configured to be provided on a peripheral surface of the core body and make contact with at least the surface of the target member;
wherein the melamine resin foam is formed into a roller configuration; and
wherein the cleaning roller is obtained after the melamine foam is compressed from an original shape in a radial direction of the cleaning roller so as to have a tensile strength of the melamine resin foam in a range of 1.7±0.5 kg/cm 2 .
8. The image forming apparatus according to claim 7 , wherein a compressibility of the melamine resin foam is 30±15% from the original shape in the radial direction.
9. The image forming apparatus according to claim 7 , wherein the melamine resin foam including a continuous foam structure and a density in a range of from 5 to 15 kg/m 3 .
10. The image forming apparatus according to claim 7 , wherein the cleaning roller is provided to be rotated with a rotation of the charging roller.
11. The image forming apparatus according to claim 7 , wherein the charging roller comprises a resistance adjustment layer made of a resin composite and formed on an outer periphery of a core metal and has a JIS-D hardness of 45 degrees or more.
12. The image forming apparatus according to claim 7 , wherein the melamine resin foam includes a continuous foam structure and an rate of elongation in a range of 20 to 40%.
13. A cleaning roller that is configured to make contact with a surface of a target member to be cleaned, the cleaning roller comprising:
a core body;
a melamine resin foam that is configured to be provided on a peripheral surface of the core body and make contact with at least the surface of the target member;
wherein the melamine resin foam is formed into a roller configuration;
wherein the cleaning roller is obtained after the melamine foam is compressed with heating from an original shape in a radial direction of the cleaning roller so as to have a compressibility of 30±15%.
14. The cleaning roller according to claim 13 , wherein the melamine resin foam includes a continuous foam structure and a density in a range of from 5 to 15 kg/m 3 .
15. The cleaning roller according to claim 13 , wherein the target member is a charging roller.
16. The cleaning roller according to claim 15 , wherein the cleaning roller is provided to be rotated with a rotation of the charging roller.
17. The cleaning roller according to claim 13 , wherein the melamine resin foam includes a continuous foam structure and an rate of elongation in a range of 20 to 40%.