CN1379293A - Conductive roller and its manufacturing method - Google Patents
Conductive roller and its manufacturing method Download PDFInfo
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- CN1379293A CN1379293A CN 01116307 CN01116307A CN1379293A CN 1379293 A CN1379293 A CN 1379293A CN 01116307 CN01116307 CN 01116307 CN 01116307 A CN01116307 A CN 01116307A CN 1379293 A CN1379293 A CN 1379293A
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Abstract
An electrically conductive rolling drum for obtaining good image is composed of a mandral, a spongy rubber layer whose main component is oil resistant rubber containing air bubbles and a hard rubber layer whose main component is non-polar rubber containing electrically conductive substanc. The hard rubber layer is formed by coating rubber pasty composite on the surface of spongy rubber layer. After 1000 V voltage is applied and the maximal and minimal resistor values Rmax and Rmin in circumferential direction air measured, the D is calculated to be less than 0.3 according to the aquation: D=log (Rmax)-log(Rmin).
Description
The present invention relates to the conductive roller that office equipment such as duplicating machine, laser printer, facsimile recorder, ATM are used.
The image of office equipment forms in the mechanism, adopts conductive rollers such as charged roller, development roller, transfer printing roller.When forming image with this equipment, at first charged roller makes electrostatic latent image maintenance body uniform chargeds such as photosensitive drums.Then, keep forming electrostatic latent image on the body at electrostatic latent image by image exposure.Then, use the development roller, toner is provided to electrostatic latent image keeps forming the toner picture on the body.This this toner picture is transferred on the block letter such as paper and photographic fixing again by the transfer printing roller.So just can print out desirable image.
Charged roller, development roller and transfer printing roller all keep body directly to contact with electrostatic latent image, therefore need have softness to a certain degree, and feasible and electrostatic latent image keeps obtaining suitable crimping surplus between the body.For example the Japanese patent gazette spy opens and has disclosed a kind of conductive roller that improves flexibility by foamed rubber floor and the stacking floor of rubberite in flat 8-334995 number.
But these rollers, aspect image formation mechanism, its resistance value need be 10
5Ω to 10
10Ω magnitude (being the semiconduction district).In order to reach the purpose that makes roller have electric conductivity, often adopt ionic-conductive polymer, ionic conductive agent etc., make roller be ionic conductivity.This ionic conductivity roller flows through with the mobile electric current that makes of free ion.Thereby the resistance change that is caused by tunnel effect (the particular content back is addressed) seldom.
Can find that this ionic conductivity roller exists the ion movability with environmental changes such as temperature, humidity, this trend so resistance value can change.And its free ion amount of ionic conductivity roller reduces toward the increase of contact with access times, manufacturing back fate, and resistance value can increase (variation that what is called is accumulated over a long period).The error of resistance value, the variation meeting forms to image and brings harmful effect day by day.
In order to reach the purpose that makes roller have electric conductivity, often in rubber, be mixed with electron conduction materials such as carbon black or metal powder.If roller is added voltage, electronics just conducts by the electron conduction material, and electric current is flow through.The electron conduction roller owing to do not need to adopt the ionic conductivity material, therefore can suppress the variation that resistance value is accumulated over a long period with environmental variations, resistance value.
But find this its making alive of electron conduction roller just more little this phenomenon of high resistance more.Resistance value is relevant with the institute making alive, and estimation is because can energising (so-called tunnel effect) under high voltage between the electronic conduction material of energising under the low-voltage caused.And this electron conduction roller just can be with the position value of having a resistance error if the electron conduction species distribution is inhomogeneous.The change of resistance value, error can form to image brings harmful effect.
Like this, resistance value and the little conductive roller of institute's making alive degree of association, the degree of association of its resistance value and environment is bigger, and the variation that resistance value is accumulated over a long period is also big.On the other hand, resistance value and the little conductive roller of environmentally hazardous degree, its resistance value is bigger again with an alive degree of association, and resistance value is also bigger with the error that the position produces.Present actual conditions are not obtain as yet a kind ofly satisfying above-mentioned over-all properties, always can forming the conductive roller of good image.
The present invention is just in view of this actual conditions, and its purpose is, a kind of conductive roller that obtains good image is provided.
For achieving the above object, conductive roller of the present invention,
Foamed rubber layer that has a core, forms in the surface of this core one side and the rubberite layer that forms in the surface of this foamed rubber layer one side is characterized in that,
Order adds that the resistance maximal value of along the circumferential direction measuring under the 1000V voltage status is Rmax (Ω), when minimum value is Rmin (Ω), with following formula (1)
D=log (Rmax)-log (Rmin) ... (1) the D value that calculates is less than 0.3.
This conductive roller, the D value that calculates with above-mentioned formula (1) are less than 0.3, and resistance value is less because of the error that the position produces.Thereby the image that is obtained is good.
Best, order adds that the resistance mean value of along the circumferential direction measuring under the 1000V voltage status is R1 (Ω), adds when the resistance mean value of along the circumferential direction measuring under the 100V voltage status is R2 (Ω), with following formula (2)
D=log (R2)-log (R1) ... (2) the d value that calculates is less than 1.0.
This conductive roller, the d value that calculates with above-mentioned formula (2) be less than 1.0, and resistance value is little with the institute alive degree of association.Thereby the image that is obtained is good.
Best, rubberite layer available electron conductive material makes it to present electric conductivity, and this rubberite layer forms by the coating rubber paste composition.This rubberite layer is realized electric conductivity by the electron conduction material, so the rubberite layer does not need the hybrid ionic conductive material.Thereby the degree of association of resistance value and environment is little, and the variation that resistance value is accumulated over a long period is also little.In addition, the rubberite layer forms by the coating rubber paste composition, therefore can solve the intrinsic problem of resistance value because of this electron conduction roller of error that causes with institute's making alive degree of association and position.
Best, the foamed rubber layer is a principal ingredient with oil resistance rubber, and the rubberite layer is principal ingredient with the non-polar rubber.The foamed rubber layer is a principal ingredient with oil resistance rubber, just can be when this foamed rubber layer coating rubber paste composition, and the solvent that suppresses the rubber paste composition makes the foamed rubber layer soak into expansion or variation.In addition, the rubberite layer is principal ingredient with the non-polar rubber, and the rubber paste composition just can use the little solvent of polarity like this, can prevent further that therefore this solvent from soak into the oil resistance rubber of foamed rubber layer and expanding.
Brief Description Of Drawings
Fig. 1 is the stereographic map that the present invention's one example conductive roller is shown.
Below suitably with reference to description of drawings the invention process form.
Fig. 1 is the stereographic map that the present invention's one example conductive roller 1 is shown.This conductive roller 1 has a core 2, foamed rubber layer 3 and rubberite layer 4.
Wish that especially foamed rubber layer 3 adopts oil resistance rubber.By adopting oil resistance rubber, when applying the rubber paste composition of addressing later, can prevent that solvent contained in the rubber paste composition from soak into foamed rubber layer 3 and expanding.The term of used so-called oil resistance in this instructions means that the SP value is the rubber more than 9.0.As desirable oil resistance rubber, can enumerate acrylonitrile-butadiene copolymer, urethane rubber, neoprene etc.When adopting oil resistance rubber, this oil resistance rubber also can with non-oil resistance rubber mix.As desirable non-oil resistance rubber, can enumerate the ethylene-propylene-diene copolymer of against weather excellence.Even mix the occasion of non-oil resistance rubber,, be principal ingredient also preferably with oil resistance rubber from suppressing to soak into the viewpoint that expands.Specifically, the oil resistance rubber ratio that accounts for whole rubber constituent is preferably more than the 50 quality %.
Foamed rubber layer 3 contains bubble, and bubble forms by the gas-development agent foaming usually.As used desirable gas-development agent, can enumerate azo dicarbonamide, N, chemical reaction type organic foaming agents such as N-dinitroso pentamethylene tetramine.Usually, foam simultaneously with rubber heating and cross-linking reaction.The combined amount of chemical reaction type organic foaming agent (mass ratio) is with respect to 100 parts of rubber, roughly more than 3 parts below 11 parts.Combined amount is not if reach above-mentioned scope, and it is low to tend to foam expansion, and the flexibility of conductive roller 1 is not enough.Otherwise combined amount tends to make gas-development agent to hinder the cross-linking reaction of rubber again if surpass above-mentioned scope, makes conductive roller 1 insufficient strength.Also can use low boiling type gas-development agent instead of chemical response type organic foaming agent, also can lean on miniature lattice to form bubble in addition.
The foam expansion of foamed rubber layer 3, hope are more than 2 times below 7 times, wish it is more than 3 times below 6 times especially.Foam expansion is not if reach above-mentioned scope, and the flexibility that tends to conductive roller 1 is not enough.Otherwise foam expansion is if surpass above-mentioned scope, and often the intensity of conductive roller 1 can be not enough.
The thickness of foamed rubber layer 3 does not have special restriction, usually below the above 10mm of 2mm.Thickness tends to impair the flexibility of conductive roller 1 if do not reach above-mentioned scope.Otherwise thickness is if surpass above-mentioned scope, and often the intensity of conductive roller 1 can be not enough.
Rubberite layer 4 can be an electron conduction, also can be ionic conductivity, but from suppressing resistance value with environmental variations with suppress the viewpoint of accumulating over a long period and changing, preferably electron conduction.In order to make hard picture glue-line 4 be electron conduction, at ethylene-propylene-diene copolymer for example, Styrene-Butadiene, naturally for example mix in as nonionic conducting rubbers such as glue, butadiene rubber, isoprene rubber, silicon rubber that electron conduction such as carbon black, metal powder material gets final product.
Non-polar rubber is adopted in the 4 special hope of rubberite layer.By using non-polar rubber, can prevent better that therefore this solvent from soak into the oil resistance rubber of foamed rubber layer and expanding with the little solvent of polarity in the rubber paste composition.In addition, the term of used so-called non-polar rubber in this instructions means that the SP value is the rubber below 8.0.Desirable especially non-polar rubber is the ethylene-propylene-diene copolymer of against weather excellence.
The thickness of rubberite layer 4 does not have special restriction, usually below 300 μ m more than the 50 μ m.Thickness tends to show on conductive roller 1 surface the resistance characteristic of foamed rubber layer 3 if do not reach above-mentioned scope.Otherwise thickness tends to impair the flexibility of conductive roller 1 if surpass above-mentioned scope.
Rubberite layer 4 is by the surface-coated rubber paste composition at foamed rubber layer 3, and through heating be cross-linked to form.Thus, the electron conduction material is evenly distributed in the rubberite layer 4, can suppress the error that resistance value produces because of the position.In addition, because electron conduction material isotropy, therefore electron conduction material stochastic distribution can suppress the resistance value and the alive degree of association.Like this, form sponge conductive layer 3, just can solve the intrinsic problem of electronic conduction by the coating rubber paste composition.
In rubberite layer 4 forming process, at first, can obtain rubber composition with mixing such as rubber, crosslinking chemical, electron conduction material, various adjuvants.Then, with the dissolving of this rubber composition or be distributed in the solvent, obtain the rubber paste composition.Then this rubber paste composition is coated in the surface of foamed rubber layer 3.Coating can be adopted known methods such as scraper plate cladding process, spraying process, infusion process.Then, after solvent seasoning, make rubber cross, form rubberite layer 4 by heating.
Certainly, also can adopt and make the hard rubber shape of tubulose layer 4 entangle foamed rubber layer 3 this poling or double-deck extrusion method formation conductive roller 1, but use the poling method, foamed rubber layer 3 easy deformation, and adopt bilayer to extrude, therefore the easy skewness of electron conduction material of rubberite layer 4 or formation orientation easily wish to adopt above-mentioned rubber paste composition painting method.
The layered structure of conductive roller 1 of the present invention is not limited to structure shown in Figure 1.For example, also can be in the scope of not damaging characteristic of the present invention, between axle core 2 and the foamed rubber layer 3, between foamed rubber layer 3 and the rubberite layer 4 or rubberite layer 4 more outside one side other layer is set.
This conductive roller 1, order add under the 1000V voltage status that the resistance value maximal value of along the circumferential direction measuring is Rmax (Ω), and when minimum value was Rmin (Ω), the D value that calculates with above-mentioned formula (1) was less than 0.3.This D value is the index of expression resistance value because of the degree of error that the position produces.By making the D value, can prevent that resistance value error from causing image fault less than 0.3.For this viewpoint, the D value is preferably in below 0.1.As making the D value be in the concrete means of above-mentioned scope, for example can enumerate and form rubberite layer 4 by above-mentioned rubber paste composition painting method.In addition, the measurement of resistance value is external peripheral surface its length direction central part, the along the circumferential direction continuous coverage with regard to conductive roller 1.In addition, be zero under the D value ideal state, so the present invention does not stipulate the lower limit of D value.
Order adds under the 1000V voltage status that the resistance mean value of along the circumferential direction measuring is R1 (Ω), adds when the resistance mean value of along the circumferential direction measuring under the 100V voltage status is R2 (Ω), and the d value that calculates with above-mentioned formula (2) is better less than 1.0.This d value is the index of expression resistance value and institute's making alive degree of association.By making the d value, can prevent that the resistance value change from causing image fault less than 1.0.For this viewpoint, the d value is preferably in below 0.5.As making the d value be in the concrete means of above-mentioned scope, for example can enumerate and form rubberite layer 4 by above-mentioned rubber paste composition painting method.In addition, the calculating of resistance mean value is according to the situation of aforementioned measure R max and Rmin measured resistance value along the circumferential direction, with the intermediate value of its maximal value and minimum value as mean value.In addition, be zero under the d value ideal state, so the present invention does not stipulate the lower limit of d value.
Embodiment
Just can understand effect of the present invention according to embodiment below, but much less, should not carry out limited explanation to the present invention according to the record of this embodiment.In addition, below the term of used what is called " part " in the explanation of combined amount, mean with the quality to be the ratio of benchmark.
[embodiment 1]
With 70 parts of the acrylonitrile-butadiene copolymers trade name " DN401LL " of company (Japanese ゼ ォ Application), 30 parts of ethylene-propylene-diene copolymers (trade name of Mitsui Chemicals company " EPT4021 "), 27 parts of carbon blacks (trade name of East Sea carbon company " シ-ス ト 3 "), 3 parts of sulphur (crane sees the trade name " powder sulphur " of chemical company), 1 part of vulcanization accelerator (trade name of the emerging chemical industrial company of imperial palace " ノ Network セ ラ-CZ "), 6 parts of gas-development agents (Yonghe County changes into the trade name " PVC ニ ホ-Le AC#3 " of company) and blowing promotor (Yonghe County changes into the trade name " セ Le ペ-ス ト 101 " of company) mix for 6 parts according to a conventional method, obtain rubber composition.This rubber composition is extruded as cylindric with extruder, size is blocked in accordance with regulations, obtains preform.This preform is put into vulcanizing tank,, make it to produce cross-linking reaction with 160 ℃ of heating of temperature 30 minutes.The gas-development agent foaming obtains the foamed rubber layer in the time of crosslinked.Metallic axle core (the about 6mm of diameter) is inserted week in this foamed rubber layer, both are bondd with cementing agent.Then, with abrasion wheel grinding foamed rubber laminar surface.The foamed rubber layer thickness is about 4mm.
Then, with 100 parts of ethylene-propylene-diene copolymers (above-mentioned " EPT4021 ").33 parts of carbon blacks (above-mentioned " シ-ス ト 3 "), 2 parts of sulphur (above-mentioned " powder sulphur ") and vulcanization accelerator (above-mentioned " ノ Network セ ラ-CZ ") mix for 1 part according to a conventional method, obtain rubber composition.This rubber composition is dissolved in the toluene, obtains the rubber paste composition.Increase and decrease toluene amount, the viscosity that makes the rubber paste composition is 5000 centipoises.Next, this rubber composition is coated in the surface of foamed rubber layer with the scraper plate cladding process.After then making toluene volatilization,, form the rubberite layer with crosslinked 20 minutes of 160 ℃ of temperature.The thickness of rubberite layer is about 100 μ m.So just, obtain the conductive roller of embodiment 1.The foamed rubber layer of this conductive roller and the length of rubberite layer are about 220mm.
[embodiment 2 and embodiment 3]
The amount of carbon blacks of mixing in the rubberite layer changes into the following the amount of Table 1, and other is all identical with embodiment 1, obtains the conductive roller of embodiment 2 and embodiment 3.
[Comparative Examples 1]
Making the amount of carbon blacks of mixing in the rubberite layer is 27 parts, extrudes by bilayer to make the rubberite layer cover the foamed rubber layer, and in addition, other is all identical with embodiment 1, obtains the conductive roller of Comparative Examples 1.In addition, the crosslinked of the crosslinked and foaming of foamed rubber layer and rubberite layer all carries out after bilayer is extruded.
[Comparative Examples 2]
Substitute the rubberite layer except the overlayer of being made by the poly-inferior ethene of fluorine (PVDF) is set, other is all identical with embodiment 1, obtains the conductive roller of Comparative Examples 2, and overlayer utilizes the poling method to cover.
[Comparative Examples 3]
The rubberite layer is not set, only forms the conductive roller that forms Comparative Examples 3 by axle core and foamed rubber layer.Its thickness of foamed rubber layer of this conductive roller is identical with the summation of the foamed rubber layer thickness of the conductive roller of embodiment 1 and rubberite layer thickness.
[resistance measurement]
With the external peripheral surface of conductive roller with long for 350mm, diameter be that the aluminum cylindrical side of 30mm bumps and connects.Then, respectively add the load of 4.9N in axle core both sides.Next, be that 23 ℃, relative humidity are under 55% the environment in temperature, conductive roller is added 1000V voltage.Under this state, in 2 times in second, make conductive roller rotation 1 circle, measure the resistance value of conductive roller.Measurement is with regard to its length direction central part of conductive roller external peripheral surface, along the circumferential direction carries out continuously.Like this, just, obtain Rmax, Rmin and R1.And making alive is that other all uses the same method the 100V except making, and obtains R2.According to above-mentioned measurement result, calculate D value and d value.These the results are shown in the following table 1.
[hardness measurement]
Measure the Shore hardness E of each conductive roller.It the results are shown in the following table 1.
In sum, according to conductive roller of the present invention, can obtain preferable image.
Table 1 conductive roller evaluation result
| Embodiment | ||
| 1 | | | Comparative Examples 1 | Comparative Examples 2 | Comparative Examples 3 | ||
| Rubber * glue mixes | ????EPDM | ????100 | ????100 | ????100 | ???100 | ????PVDF | Do not form the rubberite layer |
| Carbon black | ????33 | ????30 | ????27 | ???27 | |||
| Sulfur | ????2 | ????2 | ????2 | ???2 | |||
| Add sulphur promoter | ????1 | ????1 | ????1 | ???1 | |||
| The formation method | The coating rubber paste composition | The coating rubber paste composition | The coating rubber paste composition | Double-deck extruding | Poling | ||
| log(Rmax) | ????6.4 | ????7.3 | ????8.2 | ???8.0 | ????7.5 | ????8.2 | |
| log(Rmin) | ????6.2 | ????7.1 | ????8.0 | ???7.4 | ????7.3 | ????7.7 | |
| The D value | ????0.2 | ????0.2 | ????0.2 | ???0.6 | ????0.2 | ????0.5 | |
| log(R1) | ????6.3 | ????7.2 | ????8.1 | ???7.7 | ????7.4 | ????7.9 | |
| log(R2) | ????6.8 | ????7.7 | ????8.6 | ???8.9 | ????8.5 | ????9.2 | |
| The d value | ????0.5 | ????0.5 | ????0.5 | ???1.2 | ????1.1 | ????1.3 | |
| Hardness (Shore E) | ????36 | ????35 | ????35 | ???42 | ????50 | ????30 |
* the mixing of rubberite layer
Claims (5)
1. conductive roller,
Foamed rubber layer that has a core, forms in the surface of this core one side and the rubberite layer that forms in the surface of this foamed rubber layer one side is characterized in that,
Order adds that the resistance maximal value of along the circumferential direction measuring under the 1000V voltage status is Rmax (Ω), when minimum value is Rmin (Ω), with following formula (1)
D=log (Rmax)-log (Rmin) ... (1) the D value that calculates is less than 0.3.
2. conductive roller as claimed in claim 1 is characterized in that,
Order adds that the resistance mean value of along the circumferential direction measuring under the 1000V voltage status is R1 (Ω), adds when the resistance mean value of along the circumferential direction measuring under the 100V voltage status is R2 (Ω), with following formula (2)
D=log (R2)-log (R1) ... (2) the d value that calculates is less than 1.0.
3. conductive roller as claimed in claim 1 or 2 is characterized in that, described rubberite layer available electron conductive material makes it to present electric conductivity, and this rubberite layer forms by the coating rubber paste composition.
4. conductive roller as claimed in claim 3 is characterized in that, described foamed rubber layer is a principal ingredient with oil resistance rubber, and the rubberite layer is principal ingredient with the non-polar rubber.
5. the manufacture method of a conductive roller, described conductive roller has a core, the foamed rubber layer that forms in the surface of this core one side and the rubberite layer that forms in the surface of this foamed rubber layer one side, it is characterized in that the manufacture method of described conductive roller comprises:
The coating rubber paste composition forms the operation of rubberite layer on substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011163070A CN1179250C (en) | 2001-04-06 | 2001-04-06 | Conductive roller and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011163070A CN1179250C (en) | 2001-04-06 | 2001-04-06 | Conductive roller and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1379293A true CN1379293A (en) | 2002-11-13 |
| CN1179250C CN1179250C (en) | 2004-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011163070A Expired - Fee Related CN1179250C (en) | 2001-04-06 | 2001-04-06 | Conductive roller and its manufacturing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440061C (en) * | 2002-11-15 | 2008-12-03 | 住友橡胶工业株式会社 | Conductive roller and image-forming apparatus having conductive roller |
| CN102193361A (en) * | 2010-06-25 | 2011-09-21 | 深圳市乐普泰科技有限公司 | Conductive rubber roller |
| CN102207711A (en) * | 2011-06-08 | 2011-10-05 | 北京莱盛高新技术有限公司 | Method for manufacturing sponge roller |
| CN102748379A (en) * | 2012-07-03 | 2012-10-24 | 深圳创怡兴实业有限公司 | Charged roller and gluing method thereof |
| CN103419525A (en) * | 2012-05-18 | 2013-12-04 | 上海运安制版有限公司 | Polyurethane sponge roller applicable to tile printing |
| CN103955125A (en) * | 2014-04-23 | 2014-07-30 | 佛山市埃申特科技有限公司 | Charging roller capable of uniformly charging |
-
2001
- 2001-04-06 CN CNB011163070A patent/CN1179250C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440061C (en) * | 2002-11-15 | 2008-12-03 | 住友橡胶工业株式会社 | Conductive roller and image-forming apparatus having conductive roller |
| CN102193361A (en) * | 2010-06-25 | 2011-09-21 | 深圳市乐普泰科技有限公司 | Conductive rubber roller |
| CN102193361B (en) * | 2010-06-25 | 2013-09-18 | 深圳市乐普泰科技股份有限公司 | Conductive rubber roller |
| CN102207711A (en) * | 2011-06-08 | 2011-10-05 | 北京莱盛高新技术有限公司 | Method for manufacturing sponge roller |
| CN103419525A (en) * | 2012-05-18 | 2013-12-04 | 上海运安制版有限公司 | Polyurethane sponge roller applicable to tile printing |
| CN102748379A (en) * | 2012-07-03 | 2012-10-24 | 深圳创怡兴实业有限公司 | Charged roller and gluing method thereof |
| CN103955125A (en) * | 2014-04-23 | 2014-07-30 | 佛山市埃申特科技有限公司 | Charging roller capable of uniformly charging |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1179250C (en) | 2004-12-08 |
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