CN101369126A - Image heating apparatus and pressure roller used for image heating apparatus - Google Patents
Image heating apparatus and pressure roller used for image heating apparatus Download PDFInfo
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- CN101369126A CN101369126A CNA2008101305213A CN200810130521A CN101369126A CN 101369126 A CN101369126 A CN 101369126A CN A2008101305213 A CNA2008101305213 A CN A2008101305213A CN 200810130521 A CN200810130521 A CN 200810130521A CN 101369126 A CN101369126 A CN 101369126A
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Abstract
A pressure roller forming a nip portion for contacting to a heating member to pinch and convey and heat recording material includes: a core metal and an elastic layer containing filler, the elastic layer containing the filler including thermal conductive filler with length of not less than 0.05 mm and not more than 1 mm and with thermal conductivity lambdaf in the longitudinal direction in a range of lambdaf>=500 W/(m.k) being dispersed in not less than 5 vol % and not more than 40 vol % and the elastic layer containing the filler providing thermal conductivity lambday in the longitudinal direction perpendicular to a recording material conveyance direction being lambday>=2.5 W/(m.k) and ASKER-C hardness of the filler being not more than 60 degrees, wherein a solid rubber elastic layer with thermal conductivity lambda in a thickness direction being not less than 0.16 W/(m.k) and not more than 0.40 W/(m.k) is included and the solid rubber elastic layer is formed on an outer periphery of the core metal and the elastic layer containing the filler is formed on the outer periphery of the solid rubber elastic layer. As a result, a pressure roller which can suppress temperature rise in a region, where recording material does not pass, stabilizes conveyability, provides high endurance, provides high thermal conductivity and low hardness is provided.
Description
Technical field
The present invention relates to be suitable for being installed in the pressing element in the heat fixing device on the imaging device of from the group of forming by electrophotographic copier and electrophotographic printer, selecting, and relate to the image heater that comprises this pressing element.
Background technology
The heat fixing device that is installed on the photoprinter of the printer of electrofax mode and warm-up mill mode comprises: halogen heater, the fixing roller that is heated by halogen heater and contact to form the backer roll of bite with fixing roller.In addition, the heat fixing device of film type of heating comprises: well heater, described well heater include the on-chip heating resistor that is positioned at ceramic; Photographic fixing film, described photographic fixing film contact with described well heater and move; And the backer roll that forms bite via described photographic fixing film and described well heater.
When the printer of the fixing device that above-mentioned heating roll-type is installed with the situation of large scale recording materials under the identical printing gap in interval when printing undersized recording materials continuously, on the length direction of photographic fixing bite, (non-paper feed zone) can the undue phenomenon that raises of occurrence temperature (temperature in non-paper feed zone raises) in the unsanctioned zone of recording materials.When non-paper feed regional temperature too raises, might damage each parts that constitute fixing device.In addition, if under the too high state of the temperature rising in non-paper feed zone, print large-sized recording materials, in recording materials, be heated to above needed temperature with corresponding zone, non-paper feed zone.Thereby, the high temperature print through will take place.
Particularly, under the situation that can utilize the low heat capacity ceramic heater as the film hot type of calandria, the thermal capacity of the ratio of heat capacities warm-up mill mode of calandria is little.Thereby temperature significantly raises in the non-paper feed part of calandria, and the permanance of backer roll worsens, and the high temperature print through may take place.In addition, film drives wrinkling and so on the problem of instability and film and also may take place.
In addition, along with the processing speed of printer becomes faster, the temperature in non-paper feed zone may raise too highly.Its reason is, is accompanied by the shortening of recording materials by the time of bite, and speed acutely increases, thereby, have to improve with toner as heat fixer needed fixing temperature to the recording materials.In addition, along with the violent increase of printer speed, in the step of printing continuously, do not exist the time (what is called does not have the time of sheet material) of recording materials to shorten in bite, thereby, between sheet material, exist in the time of recording materials, be difficult to make the unevenness equilibrium of Temperature Distribution.
As the means of the intensification in the non-paper feed of the reduction portion, usually, the technology of the pyroconductivity of known raising backer roll.Its advantage is, the heat transmissibility of the elastic layer that improves backer roll energetically and comprised can improve the effect that reduces the temperature that heats up in the non-paper feed zone,, improves the effect of the difference of the heat on the length direction that reduces backer roll that is.
Te Kaiping 11-116806 communique, Te Kaiping 11-158377 communique, the spy opens the 2003-208052 communique, disclosed a kind of technology: the high heat-conducting filler that is selected from the group of being made up of aluminium oxide, zinc paste and silit is added in the virgin rubber, so that improve the thermal conductivity of the elastic layer of fixing roller and backer roll.
The spy opens the 2002-268423 communique and has disclosed a kind of method, in order to improve the thermal conductivity of rotary body with elastic layer (although be not backer roll but photographic fixing band), makes elastic layer include carbon fiber.
The spy opens the 2000-39789 communique and has disclosed a kind of invention, in this invention, makes in the elastic layer and contains such as anisotropic filling materials such as graphite, so that the thermal conductivity of improvement on the roller thickness direction.
The spy opens the 2002-351243 communique and has disclosed a kind of invention, and described invention is provided with the tissue layer that adopts asphalt base carbon fiber in the elastic layer of backer roll.
The spy opens the 2005-273771 communique and has disclosed a kind of invention, and described invention is dispersed in asphalt base carbon fiber in the elastic layer of backer roll.
But, open that flat 11-158377 communique, spy are opened the 2003-208052 communique, the spy opens described in 2002-268423 communique and the Te Kai 2000-39789 communique although open flat 11-116806 communique, spy as the spy, the filling material that chooses from the group of being made up of aluminium oxide, zinc paste, silit, carbon fiber and graphite is added in the elastic layer so that improve thermal conductivity, but under the little situation of addition, can not obtain required thermal conductivity.In addition, under the big situation of addition, can cause the hardness of backer roll too high, can not obtain to be used for the problem of toner as heat fixer needed interlock width to the recording materials.As mentioned above, be difficult to strengthen simultaneously the thermal conductivity and the hardness of backer roll.
The thermal conductivity that the spy opens the backer roll that discloses in the 2002-351243 communique is very excellent.But, because fabric or based on the structure of fabric, the hardness of the rubber composite layer of high heat conduction can increase.In this case, in order to reduce the hardness of whole backer roll, the spongy rubber that foams for the elastic layer employing of lower floor is suitable.Thereby, because elastic layer is made of the sponge of foaming in lower floor, so, exist for anti-consumption room for improvement in addition.
In addition, open the backer roll that discloses in the 2005-273771 communique, the excellent thermal conductivity on the length direction of roller the spy, and can obtain the hardness of suitable roller, still, produce such problem, that is, not fine from elastic layer to the heat conduction of core metal, make that the surface temperature of roller is too low.Under the low excessively situation of backer roll surface temperature, by water vapor dewfall on the backer roll surface that heating occurs during bite, cause the instability of the conveying of recording materials at recording materials.
Summary of the invention
The present invention considers that the problems referred to above finish.An object of the present invention is to provide a kind of backer roll that is used for image heater, described backer roll can be suppressed at the interior temperature rising in zone that recording materials do not pass through, and a kind of image heater that includes described backer roll is provided.
Another object of the present invention provides a kind of backer roll, the temperature that described backer roll can be suppressed at the part that recording materials do not pass through rises, guarantee the permanance of backer roll, and establish the stability of recording sheet conveying characteristic, a kind of image heater that comprises described backer roll is provided simultaneously.
A further purpose of the present invention provides a kind of backer roll, and described backer roll comprises core metal and contains the elastic layer of filling material; The described elastic layer that contains filling material comprises heat-conducting filler, and described heat-conducting filler has the length that is not less than 0.05mm and is not more than 1mm, in the longitudinal direction, has λ
fTemperature conductivity λ in 〉=500W/ (mk) scope
f, and described heat-conducting filler is dispersed in the described elastic layer to be not less than 5 volume % and to be not more than 40 volume %; The described elastic layer that contains filling material has λ on the length direction perpendicular to the throughput direction of recording materials
yThe temperature conductivity λ of 〉=2.5W/ (mk)
y, the ASKER-C hardness of described filling material is not more than 60 °; Wherein, described backer roll comprises the solid rubber elastic layer, the temperature conductivity λ of described solid rubber elastic layer on thickness direction is not less than 0.16W/ (mk) and is not more than 0.4W/ (mk), described solid rubber elastic layer is formed on the periphery of core metal, the described elastic layer that contains filling material is formed on the periphery of solid rubber elastic layer, so that form the bite that contacts with heater, be used for clamping, carry and adding thermal recording material.
A further purpose of the present invention provides a kind of image heater, and described image heater comprises: heater is used to heat the image that is formed on the recording materials; Backer roll is used for forming bite together with heater, and recording materials are transferred in bite; Described backer roll comprises core metal and contains the elastic layer of filling material; Described elastic layer contains heat-conducting filler, and described heat-conducting filler has the length that is not less than 0.05mm and is not more than 1mm, has λ in the longitudinal direction
fTemperature conductivity λ in 〉=500W/ (mk) scope
f, described heat-conducting filler is dispersed in the described elastic layer to be not less than 5 volume % and to be not more than 40 volume %; The described elastic layer that contains filling material has λ on the length direction perpendicular to the recording materials throughput direction
yThe temperature conductivity λ of 〉=2.5W/ (mk)
y, the ASKER-C hardness of described filling material is not more than 60 °; Wherein, described backer roll comprises the solid rubber elastic layer, the temperature conductivity λ of described solid rubber elastic layer on thickness direction is not less than 0.16W/ (mk) and is not more than 0.40W/ (mk), described solid rubber elastic layer is formed on the periphery of core metal, and the described elastic layer that contains filling material is formed on the periphery of described solid rubber elastic layer.
By the detailed description of carrying out with reference to the accompanying drawings, further purpose of the present invention will become apparent.
Description of drawings
Fig. 1 is the simple tactic pattern figure of an example of imaging device.
Fig. 2 is the simple tactic pattern figure of an example of image heater.
Fig. 3 is the simple structural drawing of the layer of backer roll.
Fig. 4 A and 4B are the diagrams that is illustrated in the roller that forms in the process of making backer roll.
Fig. 5 is the enlarged perspective of the sample that cuts out of the high-termal conductivity elastic rubber layer of the roller shown in Fig. 4.
Fig. 6 A is the 6A-6A line cut-open view of amplification of the sample that cuts out of Fig. 5.
Fig. 6 B is the 6B-6B line cut-open view of amplification of the sample that cuts out of Fig. 5.
Fig. 7 is the key diagram of the example of expression carbon fiber.
Fig. 8 A, 8B and 8C are the key diagrams of the method for the expression temperature conductivity of measuring the high-termal conductivity elastic rubber layer.
Fig. 9 is the curve map of the relation between the temperature of the temperature conductivity of rubber layer of roller 1-18 of expression embodiment and non-paper feed portion.
Figure 10 is the temperature conductivity of rubber layer of expression embodiment roller 1-18 and the curve map of the relation between the rubber hardness.
Embodiment
First embodiment
(1) example of imaging device
Fig. 1 is the simple tactic pattern figure of an example of imaging device, described imaging device can install as heat fixing device according to image heater of the present invention.Described imaging device is the laser printer of electro photography.
Printer shown in the present embodiment comprises Electrophtography photosensor as the rotation drum type of image bearing member (below be referred to as photosensitive drums) 1.Photosensitive drums 1 constitutes by being formed on the outer peripheral face of cylindrical (cydariform) conducting base member of being made by the material of selecting the group of forming from al and ni such as photosensitive material layers such as OPC, amorphous Se, amorphous Si.
Drive photosensitive drums 1, make it with of the clockwise direction rotation of predetermined peripheral speed (processing speed) along arrow a, in described rotary course, utilization is carried out charging process equably as the outer peripheral face (front surface) of 2 pairs of photosensitive drums 1 of charging roller of charhing unit, so that obtain predetermined polarity and current potential.The laser beam of (on/off control) is modulated and controlled to utilization by laser beam scanner 3 output and according to image information, and scan exposure L is carried out on photosensitive drums 1 lip-deep uniform charging surface.Thereby, on the surface of photosensitive drums 1, form corresponding to electrostatic latent image as the image information of target.
Developing apparatus 4 by as developing cell utilizes toner T, with image development and visual.Can adopt the developing method of from the group that jump type developing method, binary development method and FEED development method are formed, selecting, and usually combine with image exposure and discharged-area development.
On the other hand, by driving feed rolls 8, discharge the recording materials P of a sheet containing in sheet feeding box 9 each time, and be transported to alignment roller 11 via the sheet material path that comprises guide 10 and alignment roller 11.Utilize alignment roller 11, with expectant control regularly, recording materials P is fed into the transfer printing bite T between the outer peripheral face (surface) of the surface that is positioned at photosensitive drums 1 and transfer roll 5.At transfer printing bite T, the recording materials P of feeding is clamped and carries.In course of conveying,, successively photosensitive drums 1 lip-deep toner is looked like to be transferred on the surface of recording materials P by the transfer bias that is applied on the transfer roll 5.Consequently, recording materials P carries as yet the not toner picture of photographic fixing.
The recording materials P that will carry as yet the toner picture of not photographic fixing successively separates from the surface of photosensitive drums 1, discharges from transfer printing bite T, and is directed to the bite N of heat fixing device 6 via transfer guide 12.Be directed into the recording materials P of bite N, the bite N by fixing device 6 accepts heat and pressure, thus with the heating of toner picture and photographic fixing to the surface of recording materials P.
The recording materials P that comes out from fixing device 6 is printed, and is discharged on the discharge dish 16 via the sheet material path that comprises conveying roller 13, guide 14 and distributing roller 15.
In addition,, utilize cleaning device 7, the surface of photosensitive drums 1 is handled, remove the pollutant that adheres to such as the residual toner of transfer printing etc.,, be used for repeatedly carrying out imaging so that form clean Surface as cleaning unit at the recording materials after separating.
The printer of present embodiment be a kind of A3 of acceptance (printer of the sheet material of size of 297mm * 4200mm), print speed be 50 slices/minute (for A4 (210mm * 97mm) length side of the sheet material of size).In addition, as toner, its main material comprises the styrene-propene acid resin, and its glass transition point is 55 to 65 ℃, as required, inner therein the interpolation or the outside material of from the group of forming by charge control agent, magnetic material and silicon dioxide, selecting that adds.
(2) fixing device 6
In the following description, the length direction of the member of fixing device and formation fixing device refers to direction vertical with the throughput direction of recording materials on the surface of recording materials.The direction of shorter side refers to direction parallel with the throughput direction of recording materials on the surface of recording materials.Width refers to the size on the direction of shorter side.
Fig. 2 is the mode chart of the simple structure of fixing device 6.Fixing device 6 is fixing devices of film heated type.
The cross sectional shape of the film ways (stay) 21 of length direction is the semicircle tubular basically.The length direction of film ways 21 is perpendicular to paper.Long calandria (well heater) 22 holds and remains in the groove of central portion roughly of the bottom surface that alongst is formed at film ways 221.Reference number 23 expression flexible members.Flexible member 23 is the heat-resistant films (flexible sleeve) that loosely fit into the ring belt type (cylindrical shape) on the film ways 21 that has calandria.In the present embodiment, the cylindrical thin-film 23 of well heater 22 and the rotation that contacts with described well heater 22 constitutes heater.
Long elasticity backer roll 24 is clamping films 23 and the pressing element that contacts with the base pressure of calandria 22.The elastic deformation of elastic rubber layer (elastic layer that contains filling material) 24b by high-termal conductivity between the elastic layer 24a and calandria 22 of the backer roll 24 that contacts with calandria 22 by clamping film 23, forms bite (photographic fixing bite) N.By driving force via the drive source M that transmits such as not shown drive transmission devices such as gears, drive backer roll 24, make it on the counter clockwise direction shown in the arrow b, to rotate with predetermined peripheral speed.
Calandria 22 is the ceramic heaters that generally have low heat capacity.Described in the present embodiment well heater 22 comprises such as the isometric laminal heater substrate 22a of aluminium oxide and comprises wire that vertical side (film slipping plane side) surfacewise forms or heating power member (resistance heating member) 22b of the Ag/Pd of shaped like narrow etc.In addition, well heater 22 comprises the thin surface protective seam 22c such as glassy layer, is used to cover so that protect generating component 22b.The rear side of heater substrate 22a is provided with such as thermistor equitemperature detecting element 22d.By after heating up rapidly, utilizing to comprise detector unit 22d, well heater 22 is controlled, so that keep predetermined fixing temperature (target temperature) in interior power control system (not shown) to generating component 22b power supply.
In order to reduce thermal capacity so that the Fast starting performance of modifying device, film 23 is composite bed films, described composite bed film total film thickness be not more than 100 μ m, preferably be not more than 60 μ m and be not less than the single thin film of 20 μ m and the surface of one of substrate film on be coated with release layer (separating layer).The material that is used for single thin film can select to have PTFE (teflon), PFA (tetrafluoroethene-perfluoroalkyl vinyl ether) or PPS by the performance of selecting in thermotolerance, release property, intensity and the permanance.The material that is used for substrate film can be selected polyimide, polyamide-imides, PEEK (polyetherketone) or PES (polyethersulfone).The material that is used for release layer can be selected PTFE, PFA or FEP, and (original text is: tetrafluoroethylene-perfluoroalkyl vinyl ether, it is abbreviated as PFA, find from the chemical industry dictionary, FEP is a fluorinated ethylene propylene rubber fluorinated ethylene propylene (rubber)).
The element that backer roll 24 comprises from the core metal 24d that is made by materials such as iron or aluminium, select the elastic rubber layer 24b of solid rubber elastic layer 24a, high-termal conductivity of the material of the 3rd detailed description and manufacture method acquisition and the group that release layer 24c forms below utilizing.
At least when carrying out imaging, drive backer roll 24 and make it to rotate along the counter clockwise direction of arrow b.Film 23 moves along with the rotation of backer roll 24.In other words, when driving backer roll 24 and make it to rotate, at bite N place, the friction force formation of generation affacts the revolving force on the film 23 between the outer peripheral face (surface) of the outer peripheral face (surface) of backer roll 24 and film 23.When film 23 rotations, at bite N place, the inner peripheral surface of film 23 (inside surface) contacts the line slip of going forward side by side with the sealer 22c of well heater 22.Under the described situation, can between the sealer 22c of the inside surface of film 23 and well heater 22, add lubricants such as thermotolerance railway grease in the above, so that reduce the sliding resistance between two parts.
Recording materials are clamped and carry by bite N, make that the toner on the recording materials looks like to stand heat fixer.The recording materials P that comes out from bite N separates from the surface of film 23 and is transferred, and discharges from fixing device 6.
Because in the present embodiment,, use the calandria (ceramic heater) 22 that thermal capacity is little, programming rate is fast for the fixing device 6 of film heated type, so, the time that well heater 22 reaches predetermined fixing temperature can significantly be shortened.Thereby can easily rise from normal temperature reaches high fixing temperature.Therefore,, be at fixing device 6 under the situation of holding state, need not to carry out the standby adjustment, can save energy when not printing.
In addition, except bite N, there is not tension force to affact on the film 23 of rotation basically.To the mechanism that film moves, only need configuration to be enough to admit the flange member (not shown) on top of film 23 just enough as restriction.
(3) backer roll 24
The material and the manufacturing process that just constitute backer roll below are described in detail backer roll 24.
3-1) the layer structure of backer roll 24
Fig. 3 is the mode chart of backer roll 24 simple structures.
The layer structure of the backer roll 24 described in the present invention, on the periphery of circular shaft core metal 24d, comprise at least: as solid rubber elastic layer (heat resistant rubber layer) 24a of first elastic layer, and as the elastic layer 24b of second elastic layer, described second elastic layer is by comprising filling material, and its thermal conductivity is higher than the thermal conductivity of solid rubber elastic layer 24a.Below, elastic layer 24b will be described to the elastic rubber layer of high-termal conductivity.In addition, on the periphery of the elastic rubber layer 24b of high-termal conductivity, comprise release layer 24c.In other words, the layer structure of backer roll 24 is the structures that obtain by following manner: on the periphery of circular shaft core metal 24d, according to the order of the elastic rubber layer 24b and the release layer 24c of solid rubber elastic layer 24a, high-termal conductivity, stack gradually that the elastic rubber layer 24b (elastic layer that contains filling material) of solid rubber elastic layer (thermotolerance rubber layer) 24a, high-termal conductivity and release layer 24c obtain.In other words, backer roll comprises: be formed on the solid rubber elastic layer on the core metal periphery.The elastic layer that contains filling material is formed on the periphery of solid rubber elastic layer.
Solid rubber elastic layer 24a is made by the flexible heat-resisting material that with silicon rubber is representative.In addition, as mentioned above, the temperature conductivity of solid rubber elastic layer 24a is lower than the temperature conductivity of the elastic layer 24b that contains filling material.
The elastic rubber layer 24b of high-termal conductivity is formed on the periphery of solid rubber elastic layer 24a.In other words, 24a compares with the solid rubber elastic layer, has the top layer side of the more close pressing element that the elastic layer of thermal conductivity is provided with.The elastic rubber layer 24b of high-termal conductivity is that the rubber that the flexibility heat-resisting material of representative is made constitutes by utilizing with silicon rubber, contains heat-conducting filler.
3-1-1) solid rubber elastic layer 24a
The thickness of the whole elastic layer that obtains for the thickness addition of the elastic rubber layer 24b of solid rubber elastic layer 24a by will being used for backer roll 24 and high-termal conductivity has no particular limits, but should be the thickness of the bite N that can form required width, promptly 2 to 10mm.In the described in the above scope, the thickness of solid rubber elastic layer 24a does not have specific restriction, but can be adjusted, so that obtain required thickness, described thickness is corresponding rightly with the hardness of the elastic rubber layer 24b of high-termal conductivity described in below the project.
For solid rubber elastic layer 24a, can adopt the general thermotolerance solid rubber resilient material of from the group of forming by silicon rubber and fluororubber, selecting.Under the situation that is used for fixing device 6, any material all provides enough thermotolerance and permanance, and suitable elasticity (flexibility).Thereby as main material, any silicon rubber and fluororubber all are suitable as solid rubber elastic layer 24a.
As silicon rubber,, can list the dimethyl silicone rubber of addition reaction as representative example, the dimethyl silicone rubber of described addition reaction, for example, can form the rubber bridge joint with dimethyl polysiloxane and obtain by carrying out addition reaction with vinyl and silicon hydrogen base.As fluorocarbon rubber, as representational example, can list two-dimentional free radical reaction fluorocarbon rubber, described fluorocarbon rubber, be bipolymer with vinylidene fluoride and hexafluoro pyrene as base polymer, form by the free radical reaction that utilizes superoxide to carry out that the rubber bridge joint obtains.In addition, as representational example, can list the fluorocarbon rubber of response type between the 3 D auto base, described fluorocarbon rubber, be terpolymer with vinylidene fluoride, hexafluoro pyrene and tetrafluoroethene as basic multipolymer, form by the free radical reaction that utilizes superoxide to carry out that the rubber bridge joint obtains.
But, in backer roll 24, for example, because the structure by utilizing so-called foam sponge rubber to replace solid rubber elastic layer 24a to obtain can carry out thermal insulation effectively, but its endurance quality is low, so adopting solid rubber is very important as the material of elastic layer 24a.
Here said solid rubber elastic layer 24a only refers to the layer of being made by synthetic rubber, rather than such as the foam sponge rubber layer of foam sponge rubber etc., or only by not being the synthetic rubber of foam sponge rubber and the layer that inorganic filler constitutes.
The temperature conductivity λ of thickness direction (radial direction of backer roll) of described solid rubber elastic layer that is used for the present invention's the non-foaming rubber layer of conduct is not less than 0.16W/ (mk), but is not more than 0.40W/ (mk).Described temperature conductivity is utilized KYOTO ELECTRONICSMANUFACTURING Co., and the Quick Themal ConductivityMeter QTM-500 that LTD makes measures.
Manufacturing process for solid rubber elastic layer 24a does not have specific restriction.But, can suitably adopt common die forming.
3-1-2) the elastic rubber layer 24b of high-termal conductivity
On solid rubber elastic layer 24a, form the elastic rubber layer 24b of high-termal conductivity, so that homogeneous thickness is provided.If the thickness of the elastic rubber layer 24b of high-termal conductivity is in 3-1-1) in the scope described, can adopt any suitable thickness in backer roll 24.The elastic rubber layer 24b of high-termal conductivity is basically by disperseing to form (seeing Fig. 6 A and 6B) as the carbon fiber 24f of thermal conductivity filling material in thermotolerance resilient material 24e.
Similar with the situation of solid rubber elastic layer 24a, as thermotolerance resilient material 24e, can adopt the heat resistant rubber material of from the group that constitutes by silicon rubber and fluororubber, selecting.Adopting under the situation of silicon rubber as thermotolerance resilient material 24e,, adopting addition silicon rubber usually from availability and the angle that is easy to process.
Before crude rubber sclerosis,, can produce drippage man-hour adding if viscosity is low excessively.If viscosity is too high, then be difficult to mix and disperse.Thereby 0.1 to 1000Pas crude rubber is desirable.
Below, be described in detail in the orientation form of carbon fiber 24f among the elastic rubber layer 24b of high-termal conductivity.
Fig. 4 A and 4B are the key diagrams of the roller that forms in making the process of backer roll 24.Fig. 4 A is the overall perspective of the roller made by the high-termal conductivity elastic rubber layer 24b that is shaped on the periphery of the solid rubber elastic layer 24a on the core metal 24d.Fig. 4 B is the right side view of the roller shown in Fig. 4 A.Fig. 5 is the enlarged perspective of the sample 24b1 that cuts out of elastic rubber layer 24b of the high-termal conductivity of the roller shown in Fig. 4 A.Fig. 6 A is the cut-open view of 6A-6A line of the amplification of the sample 24b1 that cuts out among Fig. 5.Fig. 6 B is the cut-open view of 6B-6B line of the amplification of the sample 24b1 that cuts out among Fig. 5.Fig. 7 is the key diagram of example shown carbon fiber 24f, is the fibre diameter part D of the described carbon fiber 24f of expression and the key diagram of fibre length partial L.
Shown in Fig. 4 A, in the roller of the elastic rubber layer 24b of the high-termal conductivity on the outer peripheral face with the solid rubber elastic layer 24a that is formed on the core metal 24d, the elastic rubber layer 24b with high-termal conductivity cuts and takes out in x direction (circumferential direction) and y direction (longitudinal direction).As shown in Figure 5, observe a cross section of x direction of the sample 24b1 that cuts out of elastic rubber layer 24b of high-termal conductivity and the b cross section of y direction respectively.Consequently, as shown in Figure 6A,, mainly observe the fibre diameter part D (see figure 7) of carbon fiber 24f for a cross section of x direction.Shown in Fig. 6 B,, observe the fibre length partial L (see figure 7) of carbon fiber 24f repeatedly for the b cross section of y direction.
In carbon fiber 24f, if the mean value of fibre length partial L less than 10 μ m, then is difficult to occur the effect of the anisotropic of temperature conductivity in the elastic rubber layer 24b of high-termal conductivity.In other words, if the temperature conductivity height on the longitudinal direction of the elastic rubber layer 24b of high-termal conductivity, the temperature conductivity on circumferential direction is low, then because the heat of non-paper feed portion can be offered the core of bite, so can both save energy, obtain same fixing performance again.If the mean value of fibre length partial L is greater than 1mm, then the dispersion processing shaping of carbon fiber 24f in the elastic rubber layer 24b of high-termal conductivity will be difficult.Thereby the length of carbon fiber 24f is not less than 0.01mm and is not more than 1mm, preferably, is not less than 0.05mm and is not more than 1mm.
As carbon fiber 24f as described above, because the heat conductivility of carbon fiber 24f recited above, adopting petroleum bitumen and coal-tar pitch is suitable as the asphalt base carbon fiber of raw material manufacturing.
In addition, the following 5 volume % that are limited to of the content that in thermotolerance resilient material 24e, disperses as carbon fiber 24f.If described lower limit is lower than 5 volume %, then thermal conductivity worsens, thus the thermal conductivity values that can not obtain to wish.Be limited to 40 volume % on the content that in thermotolerance resilient material 24e, disperses as carbon fiber 24f.If the upper limit surpasses 40 volume %, shape processing difficulties then, hardness will increase simultaneously, thus the hardness number that can not obtain to wish.In brief, in the elastic rubber layer 24b of high-termal conductivity, disperse the thermal conductivity filling material with the number percent that is not less than 5 volume % and is not more than 40 volume %.Preferably, in the elastic rubber layer 24b of high-termal conductivity, disperse the thermal conductivity filling material with the number percent that is not less than 15 volume % and is not more than 40 volume %.
In addition, the temperature conductivity λ on the length direction (axial direction of fiber) of carbon fiber 24f
fBeing not less than 500W/ (mk) is suitable (λ
f〉=500W/ (mk)).Temperature conductivity λ
fMeasurement, by the laser scintigraphy, utilize ULVAC-RIKO, the Laser FlashMethod Thermal Constant Measuring System TC-7000 (laser scintigraphy thermal constant measuring system TC-7000) that Inc. makes carries out.
Manufacturing process for the elastic rubber layer 24b of high-termal conductivity does not have specific restriction, usually, but can adopt forming processes such as die forming and coating shaping usually.In addition, can adopt the spy to open the annular coating process that discloses among 2003-190870 and the Te Kai 2004-290853.By above-described the whole bag of tricks, can on the periphery of solid rubber elastic layer 24a, form the elastic rubber layer 24b of the high-termal conductivity of seamless shape.
From the angle of shaping and performance, the thickness of the elastic rubber layer 24b of high-termal conductivity is suitable 0.10 to 5mm, and can suitably regulate according to the thickness of the solid rubber elastic layer 24d that is positioned at lower floor.Under the described in the above situation, when the elastic rubber layer 24b of the high-termal conductivity on upper strata is defined as under the situation of (thickness of the elastic rubber layer 24b of high-termal conductivity)/(thickness of solid rubber elastic layer 24a) with the thickness ratio of the solid rubber elastic layer 24a of lower floor, this ratio is suitable in 0.02 to 2 scope.
From guaranteeing the angle of required interlock width, preferably, the hardness of the elastic rubber layer 24b of high-termal conductivity is in the scope of predetermined hardness.
In the present embodiment, the hardness of the elastic rubber layer 24b of high-termal conductivity is in the scope of 5 to 60 degree, described hardness is that to utilize with JIS K7312 and SRIS 0101 standard be the KOBUNSHI KEIKI CO. of benchmark, the hardness that the ASKER Durometer Type C that LTD. makes measures (below be referred to as ASKER-C hardness).If the ASKER-C hardness of the elastic rubber layer 24b of high-termal conductivity is in the scope recited above, then can guarantee the interlock width of wishing fully.By only cutting out the elastic rubber layer 24b of high-termal conductivity, suitably pile up required number, measure not guaranteeing the sample of measuring the required enough thickness of ASKER-C hardness.The ASKER-C hardness of piling up sample that will measure is measured.For present embodiment, guarantee 15mm thickness, the sample that measure is measured.
In addition, utilize hot dish method (hot disk method) to measure the throughput direction (circumferential direction of roller of the elastic rubber layer 24b of high-termal conductivity at recording materials, be called the x direction below) go up and perpendicular to the temperature conductivity on the direction (longitudinal direction of roller is called the y direction below) of above-mentioned x direction.As above-described measurement mechanism, use KYOTO ELECTRONICSMANUFACTURING CO., the TPA-501 that LTD. makes.In order to ensure measuring required enough thickness, as Fig. 4 A and shown in Figure 5, only cut out the elastic rubber layer 24b of high-termal conductivity, by piling up the sample that predetermined sheet number form becomes will measure, and measure the sample that will measure temperature conductivity respectively in x direction and y direction.
Fig. 8 is the key diagram of method of the temperature conductivity of the expression elastic rubber layer 24b that measures high-termal conductivity.
For present embodiment, with the size of 15mm (x direction) * 15mm (y direction) * thickness (setting thickness), cut out the elastic rubber layer 24b of high-termal conductivity, the windrow of going forward side by side is folded, so that the thickness that is roughly 15mm is provided, the sample 24b2 that acquisition will be measured (seeing Fig. 8 A).Then, utilize polyimide (Kapton) adhesive tape of width 10mm to fix, thereby the sample 24b2 that can measure fix (seeing Fig. 8 B).Then, in order to make the horizontal homogenising of the flatness of wanting surface measurements of the sample 24b2 that will measure, utilize the back side on the cut surface that will measure and the surface that will measure.Prepare two groups of above-mentioned sample 24b2 that will measure.Utilize two samples that will measure to clip sensor S, so that measure temperature conductivity (seeing Fig. 8 C).Measure in change direction (x direction and y direction) under the situation of the sample 24b2 that will measure, change direction of measurement, measure with method recited above.For present embodiment, adopt the mean value of measuring for 5 times.
For the elastic rubber layer 24b of the high-termal conductivity in the backer roll in the present embodiment 24, when utilizing above-mentioned measuring method to measure, the temperature conductivity λ of y direction (longitudinal direction)
y(λ in the scope that is not less than 2.5W/ (mk)
y〉=2.5W/ (mk)).More preferably, the temperature conductivity λ of y direction (longitudinal direction)
y(λ in the scope that is not less than 10W/ (mk)
y〉=10W/ (mk)).
Because the elastic rubber layer 24b of high-termal conductivity is at the temperature conductivity λ of y direction
yBe not less than 2.5W/ (mk), the intensification in the zone (non-paper feed zone) that when printing speed, can suppress fully not have recording materials P to pass through.And then, because λ
yBe not less than 10W/ (mk), so, can further suppress not have the intensification in the zone that recording materials P passes through.
3-1-3) release layer 24d
Can form release layer 24c by lining PFA pipe on the elastic rubber layer 24b of high-termal conductivity, also can form release layer 24c by applying elastic layer with fluororubber or the fluororesin from the group of forming by PTFE, PFA and FEP, selected.If the thickness of release layer 24c can give backer roll 24 enough demolding performaces, then the thickness to release layer 24c does not have specific restriction, but, is preferably 20 to 100 μ m.
And then, in order to bond and to conduct electricity, can form bottom and tack coat between the elastic rubber layer 24b of solid rubber elastic layer 24a and high-termal conductivity and between the elastic rubber layer 24b of high-termal conductivity and release layer 24d.In addition, within the scope of the invention, each layer can be a sandwich construction.In addition, in backer roll 24,, except layer recited above, can also form other layer for the purpose of sliding capability, heating property and demolding performace.Do not have specific restriction for the order that forms above-mentioned layer, still, for the purpose of the convenience of each operation, can replace.
(4) to the performance evaluation of backer roll 24
For backer roll 24, make various types of embodiment roller 1 to 18 described below and compare roller 19 to 21, the performance of each roller is estimated.
At first, the carbon fiber that is used for embodiment roller 1 to 18 and compares roller 19 to 21 is described.
100-05M: asphalt base carbon fiber, trade name: XN-100-05M, Nippon GraphiteFiber Corporation makes, fiber diameter: 9 μ m, average fiber length L:50 μ m, temperature conductivity 900W/ (mk).
100-15M: asphalt base carbon fiber, trade name: XN-100-15M, Nippon GraphiteFiber Corporation makes, fiber diameter: 9 μ m, average fiber length L:150 μ m, temperature conductivity 900W/ (mk).
100-25M: asphalt base carbon fiber, trade name: XN-100-25M, Nippon GraphiteFiber Corporation makes, fiber diameter: 9 μ m, average fiber length L:250 μ m, temperature conductivity 900W/ (mk).
100-50M: asphalt base carbon fiber, trade name: XN-100-50M, Nippon GraphiteFiber Corporation makes, fiber diameter: 9 μ m, average fiber length L:500 μ m, temperature conductivity 900W/ (mk).
100-01: asphalt base carbon fiber, trade name: XN-100-01, Nippon GraphiteFiber Corporation makes, fiber diameter: 10 μ m, average fiber length L:1mm, temperature conductivity 900W/ (mk).
90C-15M: asphalt base carbon fiber, trade name: XN-90C-15M, NipponGraphite Fiber Corporation makes, fiber diameter: 10 μ m, average fiber length L:150 μ m, temperature conductivity 500W/ (mk).
80C-15M: asphalt base carbon fiber, trade name: XN-80C-15M, NipponGraphite Fiber Corporation makes, fiber diameter: 10 μ m, average fiber length L:150 μ m, temperature conductivity 320W/ (mk).
60C-15M: asphalt base carbon fiber, trade name: XN-60C-15M, NipponGraphite Fiber Corporation makes, fiber diameter: 10 μ m, average fiber length L:150 μ m, temperature conductivity 180W/ (mk).
4-1) the embodiment roller 1
At first, in the Al system
On the periphery of 22 core metal 24d, utilize density to be 1.20g/cm
3Addition reaction constrictive type silicon rubber, by the die forming method, form the solid rubber elastic layer 24a of thickness 3mm, obtain
28 elastic layer forms thing 1.As temperature conditions, carry out 150 ℃ * 30 minutes heating and sclerosis.
The manufacturing process of the elastic rubber layer 24b of high-termal conductivity is described below.
At first, allotment liquid A and liquid B, wherein
Weight average molecular weight Mw=65000
Number average molecular mass Mn=15000
Liquid A vinyl concentration (0.863mol%), SiH concentration (nothing)
Viscosity (7.8Pas)
Liquid B vinyl concentration (0.955mol%), SiH concentration (0.780mol%)
Viscosity (6.2Pas)
When A/B=1/1, H/Vi=0.43
Liquid A and liquid B are allocated with the ratio of 1:1,, add platinum compounds, obtain addition reaction constrictive type silicon rubber stoste as catalyst.
For above-mentioned addition reaction constrictive type silicon rubber stoste, the percent by volume with 15% cooperates asphalt base carbon fiber 100-05M equably and mixes acquisition silicon rubber composition 1.
Secondly, so that the uniform mode of mandrel, will
28 elastic layer forms thing 1 and places internal diameter to be
In 30 the metal die.Silicon rubber composition 1 is injected between metal die and the elastic layer formation thing 1, and by heat hardening under 150 ℃ * 60 minutes condition, acquisition has external diameter and is
The elastic layer of 30 high-termal conductivity elastic rubber layer 24b forms thing 2.And then, forming at above-mentioned elastic layer on the outside surface of thing 2, coating PFA (tetrafluoroethene-perfluoroalkyl vinyl ether) pipe (thickness 50 μ m) cuts two ends, so that the length that obtains at longitudinal direction is the backer roll of 320mm.With this backer roll as embodiment roller 1.
In addition, form at aforesaid elastic layer on the periphery of thing 1, form the elastic rubber layer 24b of high-termal conductivity independently.The ASKER-C hardness that its thickness is reached record under the state of 15mm at the above-mentioned high-termal conductivity elastic rubber layer 24b lamination that 15 are cut out is 17 degree.The elastic rubber layer 24b of high-termal conductivity is cut out, and utilizing the temperature conductivity of the y direction (longitudinal direction) that preceding method records is 2.55W/ (mk).The result of the above-mentioned measurement of table 1 expression.
4-2) the embodiment roller 2 to 18
Utilize the carbon fiber shown in the table 1, its loading is as shown in table 1.
For embodiment roller 4, except that the ratio of the A/B in the embodiment roller 1 is adjusted to the A/B=0.5, to make backer roll with embodiment roller 1 identical mode.With this backer roll as embodiment roller 4.
In addition, for embodiment roller 5,8,11 and 14, adopt addition constrictive type silicon rubber stoste as described below.
Weight average molecular weight Mw=33000
Number average molecular mass Mn=16000
Liquid A vinyl concentration (0.820mol%), SiH concentration (nothing)
Viscosity (1.1Pas)
Liquid B vinyl concentration (0.827mol%), SiH concentration (0.741mol%)
Viscosity (1.1Pas)
When A/B=1/1, H/Vi=0.45.
In addition, to make embodiment roller 5,8,11 and 14 with embodiment roller 1 identical mode. Other embodiment roller 2,3,6,7,9,10,12,13 and 15 to 18 adopts the loading shown in the table 1, in addition, obtains embodiment roller 2,3,6,7,9,10,12,13 and 15 to 18 with the mode identical with embodiment roller 1.The x direction of the elastic rubber layer 24b of measurement high-termal conductivity and the temperature conductivity and the ASKER-C hardness of y direction.Above-mentioned measurement result is shown in table 1.
4-3) compare roller 19
Relatively roller 19 usefulness ASKER-C hardness are that 32 degree, temperature conductivity are that 0.4W/ (mk), thickness are that the solid rubber elastic layer 24a of the silicon rubber formation of 4mm makes.By the big slightly thermal conductivity filling material of addition, the temperature conductivity that will be used for the silicon rubber of comparison roller 19 is set for the temperature conductivity that generally is not more than 0.2W/ (mk) and is compared higher temperature conductivity.Silicon dioxide is used for the thermal conductivity filling material, simultaneously also as reinforcing agent.Relatively roller 19 is not provided with high-termal conductivity elastic rubber layer 24b, and described relatively roller 19 all only is made of the solid elastic rubber layer, and is in addition, identical with the structure of embodiment roller 1.
4-4) compare roller 20
Except adopting ASKER-C hardness is that the foam sponge rubber of 29 degree, temperature conductivity 0.11W/ (mk) replaces the solid rubber elastic layer 24a, with the mode constituent ratio identical with embodiment roller 1 than roller 20.The average honeycomb diameter of above-mentioned foam sponge is 50 μ m.
4-5) compare roller 21
For roller 21 relatively, the elastic layer that is formed on the periphery of core metal only is made of the elastic rubber layer 24b of high-termal conductivity, and described high-termal conductivity elastic rubber layer 24b has the carbon fiber described in the embodiment roller 6 that thickness is 4mm.In brief, relatively the structure of roller 21 does not comprise the solid rubber elastic layer.In addition, its structure is identical with the structure of embodiment roller 1.
Performance evaluation
＜in the intensification in non-paper feed zone 〉
In order to carry out performance evaluation, the backer roll that utilizes above-mentioned technology manufacturing is used for fixing device (Fig. 2), as described above, use described backer roll is assembled into equipment in the laser printer that print speed corresponding to the sheet material of A3 size is 50/minute (for vertical sides of the sheet material of A4 size).
In above-mentioned printer, the surface movement velocity (peripheral speed) of backer roll is adjusted to 234mm/sec.Adjustment to fixing temperature is set in 220 ℃.Measure the temperature in these cases non-paper feed zone (non-paper feed portion).Having lived through the sheet material of paper feed in bite, is the sheet material (75g/m of LTR longitudinal size
2).With 500 sheet materials of the continuous paper feed of the speed of 50 sheet materials of per minute the time, measure the surface temperature of the film of non-paper feed portion.
In table 1, during less than 280 ℃, be designated as ◎ in the temperature at non-paper feed portion place.Temperature at non-paper feed portion place is not less than 280 ℃ and during less than 300 ℃, is designated as zero.When the temperature at non-paper feed portion place is not less than 300 ℃, be designated as *.In the present invention, be not less than in the temperature at non-paper feed portion place under 300 ℃ the situation, be defined as the state that the excessive temperature at non-paper feed portion place raises.
＜permanance (hardness in rubber layer be reduced to principal element) 〉
When taking place to heat up in non-paper feed portion, the hardness that the zone of heating up takes place in non-paper feed portion has the tendency of reduction.In addition, when under the situation that continues in non-paper feed portion to take place to heat up during 150,000 of paper feeds, the temperature of non-paper feed portion will too raise, and can produce that rubber layer destroys or the possibility of liquefaction.In order to verify that the intensification at non-paper feed portion place according to the present invention suppresses effect, the heating-up temperature of well heater is set in 220 degree.Make the sheet material (75g/mm of 150,000 LTR longitudinal sizes
2) with the chart drive speed paper feed of 50 of per minutes.The ASKER-C hardness of the part that heats up takes place in measurement at the non-paper feed portion place of backer roll.According to the measurement result of the ASKER-C hardness of the backer roll that carried out 150,000 paper feeds, the intensification of estimating in non-paper feed portion suppresses effect.
In table 1, be reduced in the backer roll that is not more than in 3 scopes of spending for hardness, be designated as ◎.Be reduced in backer roll in 3 to the 5 degree scopes for hardness, be designated as zero.Backer roll for taking place to destroy and liquefy, be designated as *.In the present invention, reduce in hardness and to be in 5 degree, be defined as existing to heat up suppressing effect in non-paper feed portion with the situation in the interior scope.Particularly, with the situation in the scopes that are reduced in 3 to 5 degree of hardness, be defined as reaching enough intensifications and suppress in non-paper feed portion.
＜transportation performance 〉
Under with the environment of high temperature and high humidity (32 ℃/80%), fully place the also sheet material (75g/m of the LTR longitudinal size of moisture absorption
2) when being in enough cold state exchange to print state from fixing device, in other words, with the heating-up temperature of well heater from normal temperature setting state to 220 degree, continuously during 20 of paper feeds, carry out the evaluation of transportation performance.
In table 1, the backer roll for having the good transportation performance is designated as zero.For carrying failure that thereby the backer roll of paperboard takes place, be designated as *.For embodiment roller 1, the temperature conductivity of y direction is 2.55W/ (mk).Temperature in non-paper feed portion will be 290.5 ℃, thereby can observe heats up suppresses effect.Thereby permanance (hardness) is also good.At this moment, be 205 degree in the surface temperature that is not the film central portion of non-paper feed portion.Under the situation of any embodiment roller and since the temperature of film central portion also the same with the temperature of the film central portion of embodiment roller 1 be 205 degree, so the descriptions thereof are omitted.On the other hand, ASKER-C hardness is 17 degree, so, have enough flexibilities.In addition, owing on the periphery of core metal, form the solid rubber elastic layer, so transportation performance is good.
For embodiment roller 2, the fibre length of dispersed carbon fiber is the same with the situation of embodiment roller 1 with temperature conductivity.Disperse content to be increased to 25%.Temperature conductivity on the y direction is 10.67W/ (mk), greater than the temperature conductivity of embodiment roller 1.ASKER-C hardness increases to 27 degree, but still has enough flexibilities.Temperature in non-paper feed portion is 272.5 ℃.Observe very high intensification and suppress effect.Consequently, permanance (hardness) is also good.In addition, transportation performance is also fine.
For embodiment roller 3, the fibre length of the carbon fiber that is disperseed is identical with the situation of embodiment roller 1 with temperature conductivity.Disperse content to be increased to 35%.The temperature conductivity of y direction is 39.22W/ (mk), far above the temperature conductivity of embodiment roller 1.ASKER-C hardness also increases to 39 degree, but still has enough flexibilities.Temperature in non-paper feed portion is 256.2 ℃.Observe very high intensification and suppress effect.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also good.
For embodiment roller 4, for embodiment roller 3, the A/B ratio of addition constrictive type silicon rubber stoste is adjusted to A/B=0.5, so that improve degree of crosslinking.Thereby the ASKER-C hardness ratio is higher, is 60 degree.But its flexibility can not cause problem for forming the solid rubber elastic layer.For temperature conductivity, be 38.15W/ (mk) in the temperature conductivity of y direction, the same with embodiment roller 3, very high.Temperature in non-paper feed portion is 257.1 ℃, observes very high intensification and suppresses effect.Consequently, permanance (hardness) is also fine.Transportation performance is also fine in addition.
For embodiment roller 5, reduce the viscosity of virgin rubber, the content of the carbon fiber of dispersion is increased to 40 volume %.Thereby the temperature conductivity of y direction is 85.67W/ (mk), and is very high.Temperature in non-paper feed portion is 247.7 ℃.Observe very high intensification and suppress effect.Consequently, permanance (hardness) is also fine.ASKER-C hardness is 47 degree, also has enough flexibilities.For embodiment roller 5, the viscosity of virgin rubber reduces, thereby the reduction of hardness is big slightly, but still is in the scope that can not cause problem.In addition, transportation performance is also fine.For shaping, should be noted that when disperseing and contain the carbon fiber that surpasses 40 volume % difficulty is shaped.
For embodiment roller 6, in embodiment roller 1, the fibre length of the carbon fiber that disperses is changed to 150 μ m from 50 μ m.When disperseing content to be 15 volume %, the temperature conductivity of y direction is 7.66W/ (mk), greater than the temperature conductivity of the y direction of embodiment roller 1.ASKER-C hardness also is 20 degree, has enough flexibilities.Intensification in non-paper feed portion suppresses the effect height.Consequently, permanance (hardness) is also fine.Transportation performance is also fine in addition.
For embodiment roller 7, for embodiment roller 6, carbon fiber disperses content to be increased to 30 volume %.The temperature conductivity of Y direction is 65.78W/ (mk), and is very high.ASKER-C hardness is 35 degree, has enough flexibilities.Intensification in non-paper feed portion suppresses the effect height.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.
For embodiment roller 8, for embodiment roller 6, the viscosity of virgin rubber reduces, and the carbon fiber content of dispersion is increased to 35 volume %.The temperature conductivity of Y direction is 117.2W/ (mk), is the highest in embodiment roller 1 to 18.ASKER-C hardness is 42 degree, has enough flexibilities equally.Temperature in non-paper feed portion is 244.2 ℃.Observe high intensification and suppress effect.For embodiment roller 8, the viscosity of virgin rubber reduces, thereby hardness reduces manyly slightly, and still, because very high intensification suppresses effect, permanance (hardness) still is in the scope that can not cause problem.In addition, transportation performance is also fine.
For embodiment roller 9, select the fibre length of the carbon fiber of long slightly dispersion, fibre length is 250 μ m.Other structure is the same with embodiment roller 1.Disperse the embodiment roller 1 of content to compare with the carbon fiber that has 15 volume % equally, the temperature conductivity of y direction is big, is 9.96W/ (mk).ASKER-C hardness is 24 degree, has enough flexibilities.Intensification in non-paper feed portion suppresses the effect height.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.
For embodiment roller 10, for embodiment roller 9, carbon fiber disperses content to be increased to 25 volume %.The temperature conductivity of Y direction is 41.6W/ (mk), and is very high.ASKER-C hardness is 34 degree, has enough flexibilities equally.Intensification in non-paper feed portion suppresses the effect height.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.
For embodiment roller 11, for embodiment roller 10, the viscosity of virgin rubber reduces, and the content of the carbon fiber of dispersion is increased to 30 volume %.The temperature conductivity of Y direction is 80.23W/ (mk), and is very high.ASKER-C hardness is 39 degree, has enough flexibilities equally.Temperature in non-paper feed portion is 248.2 ℃.Observe very high intensification and suppress effect.For embodiment roller 11, the same with embodiment roller 8, the viscosity of virgin rubber reduces, thereby the reduction of hardness is big slightly, and still, because very high intensification suppresses effect, permanance (hardness) is in the scope that can not cause problem.In addition, transportation performance is good.
For embodiment roller 12, selecting fibre length is the dispersed carbon fiber of the length of 500 μ m.Disperseing content is 5 volume %.Other structure is the same with embodiment roller 1.Disperseing content is 5 volume %, and the temperature conductivity of Y direction is 3.56W/ (mk).ASKER-C hardness is 29 degree, has enough flexibilities equally.Temperature in non-paper feed portion is 286.8 ℃.Observing heats up suppresses effect.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.
For embodiment roller 13, for embodiment roller 12, carbon fiber disperses content to be increased to 15 volume %.The temperature conductivity height of Y direction is 21.44W/ (mk).ASKER-C hardness is 34 degree, has enough flexibilities equally.Intensification in non-paper feed portion suppresses the effect height.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.
For embodiment roller 14, for embodiment roller 13, the viscosity of virgin rubber reduces, and the content of the carbon fiber that disperses is increased to 25 volume %.The temperature conductivity of Y direction is 89.6W/ (mk), and is very high.ASKER-C hardness is 44 degree, has enough flexibilities equally.Temperature in non-paper feed portion is 247.2 ℃.Observe high intensification and suppress effect.For embodiment roller 14, the same with embodiment roller 8, the viscosity of virgin rubber reduces, thereby the reduction of hardness is big slightly, and still, because high intensification suppresses effect, permanance (hardness) is in the scope that can not cause problem.In addition, transportation performance is good.
For embodiment roller 15, the fibre length of selecting dispersed carbon fiber is the carbon fiber of 1mm, and fibre length is quite long.Disperseing content is 5 volume %.Other structure is the same with embodiment roller 1.Even for the dispersion content of 5 volume %, the temperature conductivity of y direction is 6.35W/ (mk).ASKER-C hardness is 49 degree, has enough flexibilities equally.Temperature in non-paper feed portion is 278.9 ℃.Observing heats up suppresses effect.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.
For embodiment roller 16, for embodiment roller 15, the content of the carbon fiber of dispersion is increased to 15 volume %.The temperature conductivity height of Y direction is 38.3W/ (mk).ASKER-C hardness is 55 degree, has enough flexibilities equally.Intensification in non-paper feed portion suppresses the effect height.Permanance (hardness) is also fine.In addition, transportation performance is also fine.
For embodiment roller 17, with the temperature conductivity λ of carbon fiber itself
fBe set in 500W/ (mk), adopt the fibre length of 150 long slightly μ m.When disperseing content to be 15 volume %, the temperature conductivity of y direction is 4.26W/ (mk).ASKER-C hardness is 20 degree, has enough flexibilities.Temperature in non-paper feed portion is 284.4 ℃.Observing heats up suppresses effect.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.
For embodiment roller 18, for embodiment roller 17, the content of the carbon fiber of dispersion is increased to 30 volume %.The temperature conductivity height of y direction is 37.89W/ (mk).ASKER-C hardness is 35 degree, and has enough flexibilities.Temperature in non-paper feed portion is 257.1 ℃, suppresses the effect height in the intensification of non-paper feed portion.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.
In brief, all embodiment rollers 1 to 18 all have to heat up in non-paper feed portion and suppress effect.Consequently, permanance (hardness) is also fine.In addition, transportation performance is also fine.In addition, owing on the periphery of core metal, form the solid rubber elastic layer, so, can improve permanance.
For roller 19 relatively, because the temperature conductivity of solid rubber elastic layer is about 0.4W/ (mk), so the temperature height at non-paper feed portion place is 311.2 ℃.Fluororesin layer fusion on the superficial layer of film surface layer and comparison roller 1.In addition, observe the liquefaction of the rubber layer of comparison roller 19.In other words, for being evaluated as of permanance (hardness) *.Transportation performance is good.
For roller 20 relatively, the temperature conductivity of y direction is 2.48W/ (mk), but is 295.6 ℃ in the temperature of non-paper feed portion, and observing heats up suppresses effect.On the other hand, hardness is 17 degree, has enough flexibilities.But,, form foam sponge, so permanance is low because the solid rubber elastic layer is replaced.When paper feed was roughly 80,000, the foam sponge layer broke.Consequently, heat up to suppress effect although exist,, to being evaluated as of permanance (hardness) *.Transportation performance is good.
For comparing roller 21, the temperature conductivity of y direction is 6.52W/ (mk), and the temperature conductivity of x direction is 4.23W/ (mk).For roller 21 relatively, carbon fiber is disperseed and is included in the whole layer of the elastic layer on the periphery that is laminated to core metal, thereby, have the value of enough temperature conductivitys.Consequently, the temperature at non-paper feed portion place is 273.2 ℃.Obtain high intensification and suppress effect.But the carbon fiber degree of orientation in a longitudinal direction reduces.Relatively the ratio y/x of the temperature conductivity of the temperature conductivity of the y direction of roller 21 and x direction is lower than the ratio in the embodiment roller 1 to 18.Therefore, allow heat to overflow from any direction of the thickness of core metal, thereby, the easy step-down of the temperature on roller surface.Under the situation that fixing device begins to print from the normal temperature state, the lip-deep temperature of backer roll can not raise, but on the surface of water vapor that recording materials produce during bite by heating at backer roll dewfall.Therefore, relatively in the roller 21 the property paperboard taking place to carry, is making the conveying instability of recording materials.In brief, to being evaluated as of transportation performance *.
In other words, in roller 19 to 21 relatively, at least the intensification inhibition of non-paper feed portion, permanance (hardness) guarantee with the guaranteeing of transportation performance in the middle of at least one factor can not reach good standard.
Fig. 9 is the temperature conductivity λ of the rubber layer of expression the foregoing description roller 1 to 18
yAnd the curve map that concerns between the temperature at non-paper feed portion place.Figure 10 is the temperature conductivity λ of expression rubber layer
yCurve map 2 with the relation of rubber hardness.
For backer roll 24 of the present invention, adopt the filling material of the high-termal conductivity of fine fibre shape (needle-like) so that provide high-termal conductivity elastic rubber layer 24b perpendicular to the temperature conductivity λ on the direction (y direction) of the throughput direction of recording materials
y, λ
y〉=2.5W/ (mk).Consequently, as can be seen from Figure 9, as can be seen, compare with comparing roller 1, the inhibition effect of intensification approximately exceeds 20 degree.And then, reaching λ
yIn the time of 〉=2.5W/ (mk), set the hardness of the ASKER-C of high-termal conductivity elastic rubber layer 24b to such an extent that be not higher than 60 degree (embodiment roller 4 shown in Figure 10).Consequently, suppress effect, can not hinder formation, and can guarantee sufficient fixing performance as the bite of backer roll with above-mentioned intensification.
And then the solid rubber elastic layer is formed on the periphery of core metal.Be formed on the periphery of solid rubber elastic layer because contain the layer of filling material, so, the intensification of non-paper feed portion suppress effect and permanance (hardness) all fine.In addition, can obtain good transportation performance.
In addition, for the backer roll 24 of present embodiment, by making temperature conductivity λ
yBe not less than 10W/ (mk), that is, and λ
y〉=10W/ (mk) as shown in Figure 9, can observe very high intensification and suppress effect, and its temperature is frequently more than approximately low 35 degree of temperature than roller 1.And then, making λ
yIn the time of 〉=10W/ (mk), with the ASKER-C hardness of high-termal conductivity elastic rubber layer 24b set for be not higher than 55 the degree.Consequently, when obtaining above-mentioned intensification inhibition effect, can not hinder formation, can guarantee sufficient fixing performance as the bite of backer roll.In addition, as can be as can be seen from Figure 10, even the temperature conductivity λ of the y direction of the elastic rubber layer 24b of high-termal conductivity
yIdentical, obviously, the fibre length of carbon fiber is long more, and ASKER-C hardness is high more.In other words, in heat-resistant elastic material 24e, include under the situation of carbon fiber 24f, can disperse to have carbon fiber 24f with close fibre length described in the present embodiment.Consequently, in backer roll 24, above-described situation obviously is suitable for keeping the flexibility (formation of soft) of whole elastic layer (the elastic rubber layer 24b of solid rubber elastic layer 24a+ high-termal conductivity).In order to ensure required interlock width, for the hardness of solid rubber elastic layer, ASKER-C hardness can be in 65 degree.
(5) other
5-1) for the fixing device 6 of the film heated type in the above embodiments, well heater 22 is not limited to ceramic heater.For example, the well heater that can from the group of forming by the Contact Heating body that utilizes nichrome wire, such as electromagnetic induction heating members such as iron plates, select.Well heater 22 needn't be positioned at bite N place.
5-2) as the heater of fixing device, can use by the fixing roller that heats one of in halogen heater and the ceramic heater.
5-3) image heater is not limited to the fixing device 6 of embodiment, also can be from interim photographic fixing by the image heater of the uncertain image of recording materials carryings with carrying the record images material by heating again and improve the group of forming such as the image heater of surface naturies such as glossiness and select.
Although invention has been described for the typical embodiment of top reference,, should be appreciated that the present invention is not limited to the embodiment that is disclosed.Below appended institute claim, provided and of the present inventionly set forth the most widely, comprise all remodeling and 26S Proteasome Structure and Function of equal value.
Claims (9)
1. backer roll, described backer roll contact with heater forming bite, so that clamp, carry and add thermal recording material, described backer roll comprises:
Core metal, and
The elastic layer that contains filling material,
The described elastic layer that contains filling material comprises heat-conducting filler, and described heat-conducting filler has the length that is not less than 0.05mm and is not more than 1mm, has λ in the longitudinal direction
fTemperature conductivity λ in 〉=500W/ (mk) scope
f, and described heat-conducting filler is dispersed in the described elastic layer to be not less than 5 volume % and to be not more than 40 volume %, and
The described elastic layer that contains filling material has λ on the length direction perpendicular to the throughput direction of recording materials
yThe temperature conductivity λ of 〉=2.5W/ (mk)
y, the ASKER-C hardness of described filling material is not more than 60 degree,
Wherein, described backer roll comprises the solid rubber elastic layer, the temperature conductivity λ of described solid rubber elastic layer on thickness direction is not less than 0.16W/ (mk) and is not more than 0.4W/ (mk), described solid rubber elastic layer is formed on the periphery of core metal, and the described elastic layer that contains filling material is formed on the periphery of solid rubber elastic layer.
2. backer roll as claimed in claim 1 is characterized in that,
The elastic layer that contains filling material comprises the thermal conductivity filling material, and described thermal conductivity filling material is at the temperature conductivity λ of length direction
fAt λ
fIn the scope of 〉=500W/ (mk), described filling material is dispersed in the described elastic layer to be not less than 15 volume % and to be not more than 40 volume %, and
The described elastic layer that contains filling material has temperature conductivity λ on the length direction perpendicular to the recording materials throughput direction
y, described temperature conductivity λ
y〉=10W/ (mk).
3. backer roll as claimed in claim 1 is characterized in that,
Described thermal conductivity filling material is an asphalt base carbon fiber.
4. backer roll as claimed in claim 1 is characterized in that,
Described backer roll has release layer on outermost superficial layer.
5. image heater is used for the image fixing that will be formed on the recording materials, comprising:
Heater is used to heat the image that is formed on the recording materials;
Backer roll is used for forming bite together with heater, and recording materials are carried in bite;
Described backer roll comprises core metal and contains the elastic layer of filling material; The described elastic layer that contains filling material comprises the thermal conductivity filling material, and described thermal conductivity filling material has the length that is not less than 0.05mm and is not more than 1mm, has λ in the longitudinal direction
fTemperature conductivity λ in 〉=500W/ (mk) scope
f, described thermal conductivity filling material is dispersed in the described elastic layer to be not less than 5 volume % and to be not more than 40 volume %; The described elastic layer that contains filling material has λ on the length direction perpendicular to the throughput direction of recording materials
yThe temperature conductivity λ of 〉=2.5W/ (mk)
y, the ASKER-C hardness of described filling material is not more than 60 degree;
Wherein, described backer roll comprises the solid rubber elastic layer, the temperature conductivity λ of described solid rubber elastic layer on thickness direction is not less than 0.16W/ (mk) and is not more than 0.4W/ (mk), described solid rubber elastic layer is formed on the periphery of core metal, and the described elastic layer that contains filling material is formed on the periphery of described solid rubber elastic layer.
6. image forming apparatus as claimed in claim 5 is characterized in that,
The described elastic layer that contains filling material comprises the thermal conductivity filling material, and described thermal conductivity filling material has temperature conductivity λ in a longitudinal direction
fAt λ
fIn the scope of 〉=500W/ (mk), described thermal conductivity filling material is dispersed in the described elastic layer to be not less than 15 volume % and to be not more than 40 volume %, and
The described elastic layer that contains filling material has temperature conductivity λ on the longitudinal direction perpendicular to the recording materials throughput direction
y, described λ
y〉=10W/ (mk).
7. image forming apparatus as claimed in claim 5 is characterized in that,
The thermal conductivity filling material is an asphalt base carbon fiber.
8. image forming apparatus as claimed in claim 5 is characterized in that,
Described backer roll has release layer on outermost superficial layer.
9. image forming apparatus as claimed in claim 5 is characterized in that,
Described heater comprises well heater, and described well heater is included in the electric conductivity generating component on the substrate, and the tubular film that contacts and rotate with described well heater.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007167477 | 2007-06-26 | ||
| JP2007167477 | 2007-06-26 | ||
| JP2008162559 | 2008-06-20 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105631539A Division CN102081332B (en) | 2007-06-26 | 2008-06-26 | Image heating apparatus and pressure roller for image heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101369126A true CN101369126A (en) | 2009-02-18 |
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ID=40402274
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101305213A Pending CN101369126A (en) | 2007-06-26 | 2008-06-26 | Image heating apparatus and pressure roller used for image heating apparatus |
| CN2010105631539A Active CN102081332B (en) | 2007-06-26 | 2008-06-26 | Image heating apparatus and pressure roller for image heating device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105631539A Active CN102081332B (en) | 2007-06-26 | 2008-06-26 | Image heating apparatus and pressure roller for image heating device |
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|---|---|
| JP (2) | JP5328235B2 (en) |
| CN (2) | CN101369126A (en) |
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| CN102043371A (en) * | 2009-10-19 | 2011-05-04 | 佳能株式会社 | Pressing member and image heating member using the pressing member |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2009031772A (en) | 2009-02-12 |
| JP5328235B2 (en) | 2013-10-30 |
| CN102081332A (en) | 2011-06-01 |
| CN102081332B (en) | 2012-11-21 |
| JP5383946B2 (en) | 2014-01-08 |
| JP2013214109A (en) | 2013-10-17 |
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