EP0302741B1 - Elément rotatif de fixage d'une image et appareil de fixage utilisant cet élément - Google Patents

Elément rotatif de fixage d'une image et appareil de fixage utilisant cet élément Download PDF

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Publication number
EP0302741B1
EP0302741B1 EP19880307251 EP88307251A EP0302741B1 EP 0302741 B1 EP0302741 B1 EP 0302741B1 EP 19880307251 EP19880307251 EP 19880307251 EP 88307251 A EP88307251 A EP 88307251A EP 0302741 B1 EP0302741 B1 EP 0302741B1
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EP
European Patent Office
Prior art keywords
layer
silicone rubber
resin
fluorine resin
rotatable member
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP19880307251
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German (de)
English (en)
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EP0302741A2 (fr
EP0302741A3 (en
Inventor
Masahiro Goto
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Canon Inc
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Canon Inc
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Publication date
Priority claimed from JP62196332A external-priority patent/JP2509545B2/ja
Priority claimed from JP22826887A external-priority patent/JPS6472183A/ja
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0302741A2 publication Critical patent/EP0302741A2/fr
Publication of EP0302741A3 publication Critical patent/EP0302741A3/en
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Publication of EP0302741B1 publication Critical patent/EP0302741B1/fr
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
    • G03G15/2057—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating relating to the chemical composition of the heat element and layers thereof

Definitions

  • the present invention relates to an image fixing rotatable member and an image fixing apparatus having the same, usable with an electrophotographic apparatus or the like to fix an unfixed image, said image fixing rotatable member having an elastic layer and a resin layer.
  • An image fixing rotatable member which comprises an elastic layer of silicone rubber or the like and a resin layer of fluorine resin or the like applied and sintered thereon, which exhibits good elasticity and parting characteristics, and therefore, which is particularly suitable for a high speed image fixing apparatus, as disclosed in DE-A-3 606 662
  • the image fixing rotatable member of this type has a very thin and pure resin layer on the elastic layer, so that the image fixing properties and releasing or parting properties are good.
  • An object of the present invention is to provide an image fixing rotatable member and an image fixing apparatus having the same, in which the adhesion of the resin layer to the elastic layer is improved, by which the service life thereof is long.
  • a rotatable member for image fixing comprising: an elastic layer and a resin layer formed on said elastic layer characterised in that said elastic layer is silicone rubber and said resin layer is a fluorine resin which is secured to said silicone rubber by application and sintering of fluorine resin material, fluorine resin particles of said material being dispersed in said silicone rubber layer.
  • a rotatable member for image fixing comprising: an elastic layer and a resin layer surrounding said elastic layer, characterised in that said elastic layer is silicone rubber and said resin layer is a fluorine resin and in that a bonding layer containing fluorine resin material is provided between said silicone rubber layer and said resin layer, said fluorine resin layer being formed on said bonding layer by application and sintering of fluorine resin material, fluorine resin particles being dispersed in said silicone rubber layer.
  • a rotatable member for image fixing comprising: a first elastic layer and a resin layer surrounding said elastic layer, characterised in that said first elastic layer is silicone rubber and said resin layer is a fluorine resin, and in that there is provided a second silicone rubber layer on said first silicone rubber layer between the latter and said resin layer, said fluorine resin layer being formed on said second silicone rubber layer by application and sintering of fluorine resin material, fluorine resin particles being dispersed in said second silicone rubber layer.
  • FIG. 1 there are shown an image fixing apparatus and a roller therefor according to an embodiment of the present invention.
  • a heating roller 1 is adapted to contact with a toner image T to be fixed and includes a heating source such as a halogen heater therein.
  • a back-up roller 10 for pressing the toner image T to the heating roller 1 is provided.
  • the heating roller 1 and the back-up roller 10 constitutes a nip therebetween, through which a recording sheet P supporting an unfixed toner image T is passed, whereby the toner image T is fixed by the heat and pressure.
  • the heating roller 1 and the back-up roller 10 have similar structures, and each comprises a core metal 2 or 12, an elastic layer 4 or 14, and a resin layer 6 or 16.
  • the image fixing apparatus further comprises a temperature detecting and control means G for detecting the surface temperature of the heating roller 1 and for maintaining the surface temperature at an optimum toner-fusing temperature, for example, 160 - 200 °C, and an offset preventing liquid applying means C for applying off-set preventing liquid such as silicone oil on the surface of the heating roller 1 and for cleaning the surface of the heating roller 1.
  • a temperature detecting and control means G for detecting the surface temperature of the heating roller 1 and for maintaining the surface temperature at an optimum toner-fusing temperature, for example, 160 - 200 °C
  • an offset preventing liquid applying means C for applying off-set preventing liquid such as silicone oil on the surface of the heating roller 1 and for cleaning the surface of the heating roller 1.
  • the core metal 2 of the heating roller 1 is made of a material having good thermal conductivity such as aluminum, and the elastic layer 4 is made of silicone rubber exhibiting good elastic properties.
  • the elastic layer has, in this embodiment, a layer thickness t1 of 0.3 - 0.8 mm ( Figure 1) and an impact resilience of 65 - 85 %.
  • the resin layer 6 is of fluorine resin such as PFA (copolymer of tetrafluoroethylene resin and perfluoroalkoxyethylene resin) and PTFE resin (tetrafluoroethylene resin) exhibiting good parting properties.
  • the resin layer has a layer thickness t2 of 10 - 25 microns ( Figure 1), and the film strength is not less than 50 kg/cm2.
  • the pressing roller 10 has a structure similar to the heating roller 1.
  • the core metal 12 is made of stainless steel or iron.
  • the thickness t3 of the silicone rubber elastic layer 14 ( Figure 1) is larger than that of the heating roller, for example, 4 - 10 mm.
  • the impact resilience thereof is 65 - 85 %.
  • the resin layer 16 is, similarly to the resin layer of the heating roller 1, made of fluorine resin such as PFA and PTFE.
  • the thickness t4 ( Figure 1) thereof is 5 - 35 microns, and the film strength thereof is not less than 50 kg/cm2.
  • Each of the heating and pressing rollers 1 and 10 has a symmetricity about a center in the direction of the length thereof, and preferably each of them has a reverse-crowned, by which the diameter in the central portion is slightly smaller than those at the longitudinal end portions.
  • each of the heating roller 1 and the pressing roller 10 has the elastic layer 4 or 14 and the resin layer 6 or 16.
  • the silicone rubber is used for the elastic layer 4 or 14, and fluorine resin is mixed and dispersed in the silicone rubber.
  • an aluminum core metal 2 is prepared for the heating roller 1, and it has been finished such that the outer diameter at the central portion 1 is 58.3 mm with an amount of the reverse-crown of 150 microns, and the thickness thereof is 6.5 mm.
  • the surface thereof is sand-blasted to be degreased and then dried.
  • a primer has been applied on the surface of the core metal. It is then wrapped with a vulcanizable type silicone rubber sheet into which PTFE particles having a particle size of not more than 1 micron (preferably not more than 0.5 micron) are mixed and dispersed at the time of kneading (5 - 30 % by weight relative to silicone rubber (100 %)).
  • the silicone rubber layer thus produced is coated with PTFE dispersion in a thickness of 20 microns by spray.
  • the PTFE resin is sintered by a sintering method by which the silicone rubber roller is not heat-deteriorated too much. The sintering method will be described hereinafter.
  • the back-up roller 10 is produced in the manner similar to that for the heating roller 1.
  • the core metal 12 is made of iron, but the same materials are used for the elastic layer 14 and the resin layer.
  • the layer thickness, however, of the elastic layer 14 is 6 mm, and that of the resin layer is 25 microns.
  • the outside diameter of the roller is the same as the heating roller 1.
  • the surface temperature of the heating roller 1 was maintained at 180 °C.
  • the sheets having A4 size (JIS) were processed at a process speed of 200 mm/sec, 30 sheets/min.
  • the image fixing properties were evaluated in the following manner.
  • the used non-woven fabric was "Kojin Wiper", available from Kabushiki Kaisha Kojin, Japan (called “paper waste”, trade name) having a softness like tissue paper and rough surface like the grain of wood and having a crape retio of 32 ⁇ 3 %, a weight of 35 ⁇ 3 g/m2, a tensile strength (longitudinal direction) of 0.4 kg/15 mm or more, and a thickness of 200 microns, which is disposable.
  • the image density after the rubbing is expressed as D1
  • the fixing ratio is determined by (D1/D0) x 100 (%) .
  • the image densities D1 and D0 were measured by a MacBeth reflection type image density meter.
  • the image density D0 was controlled so as to be not less than 1.0 and not more than 1.1.
  • the parting properties were determined by a method wherein a whole surface solid black image was formed and fixed continuously on 100 transfer sheets of the same type under the same conditions, and thereafter, a white sheet was passed through the fixing apparatus, and then, the contamination of the white sheet was observed.
  • the bonding strength between the fluorine resin layer and the rubber layer was determined in the following manner.
  • the fluorine resin was partily peeled with a width of 10 mm, and a tension gauge having a full scale of 100 - 300 g was mounted.
  • the fluorine resin layer was peeled 90 degrees in the circumferential direction, and the read of the tension gauge was deemed as the bonding strength.
  • the surface temperature of the heating roller was maintained at 200 °C.
  • the heating roller and the back-up roller were produced in the similar manner as in the first embodiment, but the resin material was not mixed into the silicone rubber layer used as the elastic layer.
  • the fixing property, the parting property, the bonding strength and the durability were evaluated under the same conditions as in the Example 1.
  • the fixing property and the parting property of the Comparison Example 1 are equivalent to those of the Example 1 of the present invention in the heating and pressing rollers, but the bonding strength and the durability are inferior thereto.
  • the reason for this is considered as being that in the first example of the present invention the PTFE particles are dispersed and mixed in the silicone rubber layer of each of the rollers, and therefore, the PTFE resin particles adjacent to the surface portion of the silicone rubber layer are fused in the sintering operation and are fused with the PTFE layer of the resin layer, whereby very close bonding state is formed between the PTFE layer and the silicone rubber layer, thus increasing the bonding strength.
  • the amount of the PTFE particles mixed into and dispersed in the silicone rubber is such that the particles do not deteriorate the property of the silicone rubber (hardness, impact resilience). Since such an amount is sufficient to the increase of the bonding strength, and therefore, it is not necessary to accept deterioration of the fixing property and the parting property.
  • the advantageous effects are provided when the particle size of the PTFE particles is not more than 1 micron, further preferably, not more than 0.5 micron, and the content by weight of the particles is 5 - 30 % relative to silicone rubber (100 %). This is because the specific surface area of the PTFE particles becomes large with decrease of the particle size of the PTFE particles, and also the bonding strength with the silicone rubber becomes stronger therewith, and because the PTFE particles are uniformly dispersed in the silicone rubber so that the tolerable range of the amount of the PTFE particles becomes large.
  • the upper and lower limits of the amount of dispersed PTFE particles if it is too small, the sufficient bonding strength is not provided, and if it is too large, on the contrary, the property of the rubber (elasticity, elongation, tensile strength or the like) are remarkably deteriorated with the result that it does not perform sufficient function as the fixing roller.
  • the surface PTFE layer is quickly heated (for example, the PTFE layer is heated up to above 380 °C for not more than 15 min.) while the rubber layer is quickly cooled (water-cooled or air-cooled) from the inside of the core metal, or the use is made with dielectric heating utilizing the fact that dielectric loss tangent of the liquid PTFE dispersion per se is larger than the dielectric loss tangent of the rubber layer.
  • FIG. 3 shows an example of the apparatus usable for the sintering using the dielectric heating.
  • the apparatus comprises a magnetron 105, a wave guide 106 for guiding a high frequency wave (950 MHz - 2450 MHz) produced by the magnetron 105, an openable resin container 102 connected to the wave guide 106 and having a high frequency wave reflecting plate 103 of a metal on the inside thereof and upper and lower infrared lamp 111 with shade for externally heating with infrared rays.
  • the magentron 105 and the infrared lamp 111 are controlled by control means 110.
  • the heating roller 1 is shown as an example. Since the heating roller 1 includes the silicone rubber layer 4 in the inside and a fluorine resin coating layer 6 on the surface, the high frequency energy is absorbed more by the fluorine resin coating layer 6 since it has a larger dielectric constant than the silicone rubber layer 4. Therefore, the fluorine resin layer is quickly heated in the constant temperature container by the high frequency wave and the infrared rays, and is completely sintered by the heating for 15 min. to 340 °C. After the sintering, the roller is quickly cooled. Suitable surface fluorine resin material is PTFE dispersion available from Daikin Kabushiki Kaisha, Japan tetrafluoroethylene resin dispersion D-1). The back-up roller 10 is sintered in the same manner.
  • the fixing roller 1 and the back-up roller 10 produced in the first example using the dielectric heating had rubber properties of the elastic layer 4, 14 which were generally the same as those had by the roller before the sintering (impact resilicence or the like).
  • the surface fluorine resin layer PFA or PTFE layer 6, 16 was completely sintered to show good releasing property, resistance to wear and the bonding property with the elastic layer.
  • the heating roller and the back-up roller in this example have the layer structure as shown in Figure 4. Each of them has a core metal 2 or 12, an elastic layer 4 or 14, a bonding layer 5 or 15 and a resin layer 6 or 16.
  • the feature of this example is in the provision of the bonding layer 5 or 15 of a resin material between the elastic layer 4 or 14 and the resin layer 6 or 16.
  • the bonding layer 5 or 15 are made of a mixture of PTFE particles and heat-durable resin such as polyamide, polyimide, epoxy or the like resin.
  • the rollers were incorporated into the image fixing apparatus in the same manner as in the first example.
  • liquid provided by dispersing in a solvent the PTFE particles and sheet-durable resin such as polyamide or the like is applied as the bonding layer on the silicone rubber roller by spray in the thickness of 5 microns (heating roller) and in the thickness of 7 microns (the back-up roller), and it is air-dried under room temperature.
  • heating roller the PTFE particles and sheet-durable resin such as polyamide or the like
  • the back-up roller the back-up roller
  • the fixing property is slightly inferior to the first example, but it is practically sufficient, and the bonding strength and the durability are superior to the first example.
  • the heating roller and the back-up roller were produced in the same manner as the above second example of the present invention with the exception that the resin material was not mixed into the silicone rubber layer.
  • the results are:
  • the fixing property and the parting property are equivalent to those of the heating roller and the back-up roller in the second example, but the bonding strength and the durability are inferior. Therefore, it has been confirmed that even if the roller has the bonding layer, it is very effective for providing the sufficient bonding strength and durability to mix the fluorine resin into the elastic layer.
  • the reason for those advantageous effects is considered as being that the PTFE particles in the silicone rubber layer are fused with the PTFE particles in the bonding layer when the resin layer is sintered, and further, the PTFE particles in the bonding layer and the PTFE surface layer are fused together when the surface layer is sintered, so that the strong bonding can be provided.
  • the resin material (polyamide, polyimide, epoxy or the like resin material) in the bonding layer is pregnated into the concave portions of the surface of the silicone rubber, so that the bonding strength is enhanced under the influence of the large surface energy than the fluorine resin.
  • the roller having a silicone rubber layer into which the fluorine resin is mixed, and having a bonding layer, is highly durable, and the fixing property thereof is sufficiently practical.
  • Each of the heating roller and the back-up roller has the same structure as the above described second example of the present invention ( Figure 4).
  • the feature of this example is in the elastic layer 4 or 14.
  • the resin material polyamide, polyimide, epoxy or the like resin material
  • a highly heat-fusible resin polypropyrene or the like
  • polyamide resin particles were mixed thereinto (5 % by weight).
  • This example is the same as the above described second example in the other respect such as manufacturing and sintering.
  • the fixing property is slightly inferior, but it is still above a practical level and the bonding strength and the durability are remarkably improved.
  • the reason for this is considered as being that the resin material in the silicone rubber layer is fused at the time of the sintering operation, and are fused with the resin material in the bonding layer, so that the very strong bonding can be provided.
  • FIG. 1 A fourth example of the present invention will be described.
  • Each of the heating and back-up rollers in this example has the same layer structure as the above-described Examples 2 and 3 ( Figure 4).
  • the feature of this example is in the bonding layer 5 or 15 which is made of a mixture of water soluble fluorine rubber and PFA or PTFE fluorine resin.
  • the PTFE particles are mixed, similarly to the second example.
  • This example is the same as the above-decribed Example 2 in the other respect such as sintering.
  • the fixing property is very good, and as good as that of the rollers without the bonding layer. It has been confirmed that the bonding strength and the durability are improved.
  • the reason for this is considered as being that a strong bonding strength is not provided between rubber materials once the rubber materials have been vulcanized, and the strong bonding strength is provided by the fusing of the resin material dispersed in the rubber layer and the resin material in the bonding layer at the time of the sintering.
  • the bonding layer is of a mixture of the rubber material and the resin material in Example 4, the degree of the reduction of the elasticity of the elastic layer due to the exitence of the bonding layer is reduced, so that the fixing property is equivalent to that of the roller without the bonding layer.
  • a heat fixing apparatus has been taken as an example of a preferable application to a fixing rotatable member.
  • the present invention is applicable to a pressure fixing apparatus or the like wherein the toner image is fixed by a light pressure, or wherein the image is fixed simultaneously with image transfer.
  • the fixing apparatus includes two rollers, but it may comprise three or more rollers.
  • the rotatable member is not limited to a roller but may be in the form of a belt.
  • both of the heating and back-up rollers have the structure of the present invention.
  • the advantageous effects are provided even if the present invention is applied to only one of them.
  • Figure 5 is a partly enlarged sectional view of a roller for image fixing usable with an image fixing apparatus described in conjunction with Figure 1.
  • Each of the heating roller 1 and the back-up roller 10 has a similar structure, more particularly, it comprises a core metal 2 or 12, a first elastic layer 41, 141, a second elastic layer 51, 151 and a surface resin layer 6 or 16.
  • the first elastic layer 41 or 141 is made of a good thermal conductivity material
  • the second elastic layer 51 or 151 is made of a good thermally insulative material to which resin material is mixed.
  • the core metal 2 of the heating roller 1 is made of a material having good thermal conductivity such as aluminum, and the first elastic layer 41 made of fluorine rubber or silicone rubber on the core metal 2.
  • the first elastic layer 41 has, in this embodiment, a thermal conductivity of not less than 0.8x10 ⁇ 3 cal.cm/sec.cm2.°C and a layer thickness of 0.3 - 2.0 mm.
  • a second elastic layer 51 having a smaller thickness than the first elatic layer is formed on the first elastic layer 41.
  • the second elastic layer 51 in this embodiment has a thermal conductivity of not more than 0.4x10 ⁇ 3 cal.cm/sec.cm2.°C and a layer thickness of 0.05 mm - 0.5 mm.
  • the resin layer 6 is made of fluorine resin such as PFA resin (copolymer of tetrafluoroethylene resin and perfluoroalkoxyethylene resin), PTFE resin (tetrafluoroethylene resin).
  • the resin layer 16 has a layer thickness of 5 - 35 microns and a film strength of not less than 50 kg/cm2.
  • the pressing roller 10 has a structure similar to the heating roller 1.
  • the core metal 12 is made of stainless steel or iron.
  • the first elastic layer 141 is made of fluorine rubber or silicone rubber.
  • the first elastic layer 141 has, in this embodiment, a thermal conductivity of not less than 0.8x10 ⁇ 3 cal.cm/sec.cm2.°C and a layer thickness of 3 - 10 mm.
  • the second elastic layer 151 having a thickness smaller than the first elastic layer is formed.
  • the second elastic layer 151 has, in this embodiment, a thermal conductivity of not more than 0.4x10 ⁇ 3 cal.cm/sec.cm2.°C and a layer thickness of 0.01 - 0.5 mm.
  • the resin layer 16 is made of fluorine resin material such as PFA resin and PTFE resin.
  • the resin layer 16 has a layer thickness of 5 - 35 microns, a film strength of not less than 50 kg/cm2.
  • the thermal conductivity of the first elastic layer is preferably not less than 0.8x10 ⁇ 3 cal.cm/sec.cm2/°C
  • the thermal conductivity of the second elastic layer is not more than 0.4x10 ⁇ 3 cal.cm/sec.cm2/°C.
  • the thickness of the first elastic layer is larger than that of the second elastic layer, which is larger than that of the resin layer.
  • the thickness of the first elastic layer is larger than twice that of the second elastic layer, and sum of the thickness of the first elastic layer and the thickness of the second elatic layer is larger than six times the thickness of the resin layer.
  • Each of the heating roller 1 and the back-up roller 10 has a symmetry about a longitudinal center, and preferably the heating roller 1 (or the pressing roller 10) is reverse-crowned in which the diameter in the longitudinal center portion is slightly smaller than those at the longitudinal ends.
  • an aluminum core metal 2 was prepared which was finished such that the outer diameter at the central portion was 58.3 mm with an amount of the reverse-crown of 150 microns, and the thickness thereof is 6.5 mm. The surface thereof was sand-blasted to be degreased and then was dried. The core metal 2 was coated with a primer and then was wrapped with a vulcanizable type silicone rubber sheet (the thermal conductivity is 1.5x10 ⁇ 3 cal.cm/sec.cm2/°C). The thickness thereof was 0.35 mm.
  • the non-vulcanized silicone rubber roller is coated with a vulcanizable type silicone rubber sheet having a good thermal conductivity (0.3x10 ⁇ 3 cal.cm/sec.cm2/°C) in which PFA particles were dispersed (5 - 30 % by weight relative to silicone rubber of 100 %). Then, it was press-vulcanized for 30 min at 170 °C, and thereafter, a secondary vulcanization was effected for 15 min. at 100 °C and for 30 min. at 200 °C, and for one hour at 220 °C. It was machined to provide a rubber thickness of 0.5 mm. The first elastic layer was 0.4 mm and the second elastic layer was 0.1 mm.
  • the back-up roller 10 was produced in the same manner as the heating roller 1.
  • the core metal 12 was made of iron.
  • the materials of the first and second elastic layers 141 and 151 and the resin layer 16 were the same as those of the heating roller 1.
  • the layer thicknesses were 6 mm in the first elastic layer 14, 0.1 mm in the second elastic layer 15 and 20 microns in the resin layer 16.
  • the outer diameter of the roller was the same as that of the heating roller 1.
  • the surface temperature of the heating roller 1 was maintained at 180 °C.
  • the image fixing operation was continued, and A4 size (JIS) sheets were processed at a speed of 200 mm/sec, 30 sheets/min.
  • the ambient temperature was 15 °C
  • good image fixing properties were shown, and the production of the toner off-set was reduced to not more than one fifth the conventional good image fixing apparatus.
  • the usable period of the cleaning member was increased up to not less than 5 times.
  • the room temperature was 32.5 °C, and the humidity was 85 %, the transfer sheets were not buckled, and they were property stacked on a sorter or the like with very little curl. The images were not collapsed, and the quality thereof was high.
  • the roller includes the first elastic layer having the good thermal conductivity on the core metal, and the second elastic layer having a good thermal insulation on the first elastic layer, wherein the second elastic layer contains resin materials, and therefore the second elastic layer the heat flows at the time of the resin layer sintering, but since the second elastic layer is sufficiently thermal-insulative, the thermal damage of the first elastic layer inside thereof is eased.
  • the resin material in the outer fluorine resin layer and the second elastic layer is fused at the time of sintering, and therefore, they are fused together to provide the strong bonding therebetween. From this standpoint, it is preferable that the resin material in the second elastic layer is the same as that of the outer coating.
  • the bonding between the first elastic layer and the second elatic layer is not so strong if the second elastic layer is formed after the first elastic layer is vulcanized. In this example, however, the first elastic layer and the second elastic layer are simultaneously vulcanized, and therefore, the bonding strength therebetween is also strong. For this reason, even if the thickness of the second elastic layer is small, there occurs no peeling from the first elastic layer.
  • the thickness of the first elastic layer is larger than that of the second elastic layer, and therefore, even if the second elastic layer is deteriorated in the rubber property, desired rubber properties (impact resilience or the like) can be generally maintained as a whole.
  • the heating roller 1 and the back-up roller 10 are incorporated in an image fixing apparatus, the thermal resistance from the inside to the outside is small due to the good thermal conductivity of the first elastic layer. By this, the fixing property and the durability are good enough.
  • the elastic layer may be of fluorine rubber, EPDM or the like, depending on the usage thereof.
  • the resin layer may be of silicone resin or the like.

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  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)

Claims (18)

  1. Elément rotatif pour fixer une image, comportant : une couche élastique et une couche de résine formée sur ladite couche élastique, caractérisé en ce que ladite couche élastique (4(14)) est en caoutchouc siliconé et ladite couche de résine est une résine fluorée (6(16)) qui est fixée audit caoutchouc siliconé par application et frittage d'une matière à résine fluorée, des particules de résine fluorée de ladite matière étant dispersées dans ladite couche de caoutchouc siliconé.
  2. Elément rotatif pour fixer une image, comportant : une couche élastique et une couche de résine entourant ladite couche élastique, caractérisé en ce que ladite couche élastique (4(14)) est en caoutchouc siliconé et ladite couche de résine est une résine fluorée (6(16)), et en ce qu'une couche de liaison (5(15)) contenant une matière à résine fluorée est prévue entre ladite couche de caoutchouc siliconé et ladite couche de résine, ladite couche de résine fluorée étant formée sur ladite couche de liaison par application et frittage d'une matière à résine fluorée, des particules de résine fluorée étant dispersées dans ladite couche de caoutchouc siliconé.
  3. Elément rotatif selon la revendication 2, caractérisé en ce que ladite couche de liaison (5(15)) contient une matière conductrice.
  4. Elément rotatif selon la revendication 2 ou 3, caractérisé en ce que la couche de résine fluorée et les particules de résine fluorée dispersées dans ladite couche de caoutchouc siliconé et la résine fluorée dans ladite couche de liaison sont toutes du PTFE et du PFA.
  5. Elément rotatif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la teneur en particules de résine fluorée dans ladite couche de caoutchouc siliconé est de 5 à 30 % en poids par rapport à 100 % de caoutchouc siliconé.
  6. Elément rotatif selon la revendication 1 ou 5, caractérisé en ce que les matières de ladite couche de résine fluorée et des particules de résine fluorée dispersées dans ladite couche de caouchouc siliconé sont toutes du PTFE et du PFA.
  7. Elément rotatif pour fixer une image, comportant : une première couche élastique et une couche de résine entourant ladite couche élastique, caractérisé en ce que ladite première couche élastique (41(141)) est en caoutchouc siliconé et ladite couche de résine est une résine fluorée (6(16)), et en ce qu'il est prévu une seconde couche (51(151)) de caoutchouc siliconé sur ladite première couche de caoutchouc siliconé entre cette dernière et ladite couche de résine, ladite couche (6(16)) de résine fluorée étant formée sur ladite seconde couche de caoutchouc siliconé par application et frittage d'une matière à résine fluorée, des particules de résine fluorée étant dispersées dans ladite seconde couche de caoutchouc siliconé.
  8. Elément rotatif selon la revendication 7, caractérisé en ce que ladite première couche (41(141)) de caoutchouc siliconé possède une meilleure conductivité thermique que ladite seconde couche de caoutchouc siliconé.
  9. Elément rotatif selon la revendication 8, caractérisé en ce que ladite première couche de caoutchouc siliconé possède une conductivité thermique qui n'est pas inférieure à 0,8x10⁻³ cal.cm/s.cm².°C, et ladite seconde couche de caoutchouc siliconé possède une conductivité thermique qui n'est pas supérieure à 0,4x10⁻³ cal.cm/s.cm².°C.
  10. Elément rotatif selon la revendication 7, 8 ou 9, dans lequel ladite première couche (41(141)) de caoutchouc siliconé présente une épaisseur d₁ qui est supérieure à l'épaisseur d₂ de ladite seconde couche (51(151)) de caoutchouc siliconé, qui est supérieure à l'épaisseur d₃ de ladite couche de résine.
  11. Elément rotatif selon la revendication 10, caractérisé en ce que les épaisseurs des couches satisfont les relations

    d₁ > 2d₂, d₁+d₂ > 6d₃.
    Figure imgb0004
  12. Elément rotatif selon la revendication 10 ou 11, caractérisé en ce que d₁ est de 0,3 à 2,0 mm, d₂ est de 0,05 à 0,5 mm et d₃ est de 5 à 35 µm.
  13. Elément rotatif selon la revendication 10 ou 11, dans lequel d₁ est de 3 à 10 mm, d₂ est de 0,01 à 0,5 mm et d₃ est de 5 à 30 µm.
  14. Elément rotatif selon l'une quelconque des revendications 10 à 13, caractérisé en ce que la dimension des particules de résine contenues dans ladite seconde couche de caoutchouc siliconé n'est pas supérieure à 1 µm.
  15. Elément rotatif selon la revendication 14, caractérisé en ce que la dimension des particules n'est pas supérieure à 0,5 µm.
  16. Appareil de fixage d'image, comportant deux éléments rotatifs formant une zone de serrage dans laquelle un élément de support d'image portant une image non fixée est passé pour fixer l'image, caractérisé en ce qu'au moins l'un des éléments rotatifs est selon l'une quelconque des revendications précédentes.
  17. Appareil selon la revendication 16, caractérisé en ce qu'un premier des éléments rotatifs est celui qui peut entrer en contact avec l'image non fixée, et en ce que des moyens sont prévus pour chauffer cet élément.
  18. Appareil selon la revendication 16, caractérisé en ce que ledit premier des éléments est celui qui ne peut pas entrer en contact avec l'image non fixée.
EP19880307251 1987-08-07 1988-08-05 Elément rotatif de fixage d'une image et appareil de fixage utilisant cet élément Expired - Lifetime EP0302741B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP196332/87 1987-08-07
JP62196332A JP2509545B2 (ja) 1987-08-07 1987-08-07 定着ロ―ラ及びそれを有する定着装置
JP228268/87 1987-09-14
JP22826887A JPS6472183A (en) 1987-09-14 1987-09-14 Elastic rotary body and fixing device with same

Publications (3)

Publication Number Publication Date
EP0302741A2 EP0302741A2 (fr) 1989-02-08
EP0302741A3 EP0302741A3 (en) 1990-03-21
EP0302741B1 true EP0302741B1 (fr) 1993-10-27

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EP19880307251 Expired - Lifetime EP0302741B1 (fr) 1987-08-07 1988-08-05 Elément rotatif de fixage d'une image et appareil de fixage utilisant cet élément

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EP (1) EP0302741B1 (fr)
DE (1) DE3885190T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0823725B2 (ja) * 1987-12-14 1996-03-06 キヤノン株式会社 定着ローラー
JP2519112B2 (ja) * 1990-01-06 1996-07-31 富士ゼロックス株式会社 離型性に優れた定着用弾性ロ―ル
JPH0749631A (ja) * 1993-08-04 1995-02-21 Sumitomo Electric Ind Ltd 定着ローラ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06100876B2 (ja) * 1984-03-30 1994-12-12 キヤノン株式会社 定着用ローラ及びそれを有する定着装置
US4842944A (en) * 1984-11-07 1989-06-27 Canon Kabushiki Kaisha Elastic rotatable member
JPS61128274A (ja) * 1984-11-27 1986-06-16 Konishiroku Photo Ind Co Ltd 定着装置
JPS61158361A (ja) * 1984-12-29 1986-07-18 Nitto Kogyo Kk 電子複写機の定着用熱ロ−ラ−
JPS61169865A (ja) * 1985-01-23 1986-07-31 Showa Electric Wire & Cable Co Ltd 加熱定着ロ−ラ
US4804576A (en) * 1985-02-28 1989-02-14 Canon Kabushiki Kaisha Elastic rotatable member
JP2509544B2 (ja) * 1987-08-07 1996-06-19 キヤノン株式会社 弾性回転体及びそれを有する定着装置

Also Published As

Publication number Publication date
DE3885190T2 (de) 1994-03-10
EP0302741A2 (fr) 1989-02-08
EP0302741A3 (en) 1990-03-21
DE3885190D1 (de) 1993-12-02

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