Method for evaluating fixing member and fixing belt and thermal fixing roller
AssigneeRicoh Company, Ltd.
InventorsNorihiko Aze, Kyoichi Ashikawa, Kohji Kamiya, Minoru Matsuo, Takayuki Yoshii, Nozomu Takahata
Life of this patent
Estimating the term…
Abstract
In a method for evaluating a fixing member to fix a toner having a surface layer, a hardness test is carried out by applying a pressure deformation from the surface side of the fixing member, and when a deformation of the surface layer by the pressure deformation is within an elastic range, the fixing member is regarded as a standard product.
Claims15
A method of evaluating a fixing member used to fix a toner comprising:
- carrying out a hardness test on the fixing member by measuring a hardness value equal to a pressure applied to a surface layer of the fixing member by a probe load divided by an area of indentation as a function of indentation depth measured while the pressure is applied at a room temperature for the indentation depth of 1 μm from a surface of the surface layer, wherein
- when the hardness value for the indentation depth of 1 μm is less than or equal to 30 N/mm2, said fixing member is regarded as a standard product.
A method of evaluating a fixing member used to fix a toner comprising:
- carrying out a hardness test on the fixing member by measuring a hardness value equal to a pressure applied to a surface of the fixing member by a probe load divided by an area of indentation as a function of indentation depth measured while the pressure is applied at a room temperature for indentation depths of 1 μm to 4 μm from the surface of said fixing member, wherein
- when the hardness value for the indentation depth of 1 μm is less than or equal to 30 N/mm2, and
- when the hardness value for the indentation depth of 4 μm is less than or equal to 12 N/mm2,
- said fixing member is regarded as a standard product.
A method of evaluating a fixing member used to fix a toner, comprising:
- carrying out a hardness test at a test environment temperature of 200° C. on the fixing member by measuring a hardness value equal to a pressure applied to a surface of the fixing member by a probe load divided by an area of indentation as a function of indentation depth measured while the pressure is applied for indentation depths of 1 μm to 4 μm from the surface of said fixing member, wherein
- when the hardness value for the indentation depth of 1 μm is less than or equal to 10 N/mm2, and
- when the hardness value for the indentation depth of 4 μm is less than or equal to 4 N/mm2,
- said fixing member is regarded as a standard product.
A method of evaluating a fixing member used to fix a toner, comprising:
- carrying out a hardness test respectively at a room temperature and at a running temperature of the fixing member by measuring a hardness value equal to a pressure applied to a surface of the fixing member by a probe load divided by an area of indentation as a function of indentation depth measured while the pressure is applied for indentation depths of 1 μm to 4 μm from the surface of the fixing member, wherein
- when each of the hardness values at a same depth from the surface of said fixing member is compared, if the hardness value at the room temperature is three times the hardness value at the running temperature, said fixing member is regarded as a standard product.
A method of evaluating a fixing member used to fix a toner, said fixing member being produced by sequentially coating an elastic layer and a separation layer onto a base element, comprising:
- carrying out a hardness test by measuring a hardness value equal to a pressure applied to a surface of said separation layer by a probe load divided by an area of indentation as a function of indentation depth measured while the pressure is applied for each of first and second indentation depths from the surface of said separation layer, wherein
- when the hardness value for each of said first and second indentation depths is in a predetermined value, said fixing member is regarded as a standard product.
A method of evaluating a fixing member used to fix a toner, said fixing member being produced by sequentially coating an elastic layer and a separation layer onto a base element, comprising:
- carrying out a hardness test by measuring a hardness value equal to a pressure applied to a surface of said separation layer by a probe load divided by an area of indentation as a function of indentation depth measured while the pressure is applied for each of indentation depths of 1 μm to 4 μm from the surface of said separation layer, wherein
- when the hardness value for the indentation depth of 1 μm is less than or equal to 30 N/mm2, and
- when the hardness value for the indentation depth of 4 μm is less than or equal to 12 N/mm2,
- said fixing member is regarded as a standard product.
A method of evaluating a fixing member used to fix a toner, said fixing member being produced by sequentially coating an elastic layer and a separation layer onto a base element, wherein
- a hardness test is carried out at a test environment temperature of 200° C. on the fixing member by measuring a hardness value equal to a pressure applied to a surface of said separation layer by a probe load divided by an area of indentation as a function of indentation depth measured while the pressure is applied for indentation depths of 1 μm to 4 μm from the surface of said separation layer,
- when the hardness value for the indentation depth of 1 μm is less than or equal to 10 N/mm2, and
- when the hardness value for the indentation depth of 4 μm is less than or equal to 4 N/mm2,
- said fixing member is regarded as a standard product.
Dependencies are inferred from the claim text.