JP3320001B2 - Method for manufacturing conductive roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to an electrophotographic recording apparatus.
Conductive roller for developing, charging, discharging, transferring, etc.
In particular, a ball having a core of a good conductor metal shaft
Coating for resistance adjustment on the outer surface of rolls
The present invention relates to a conductive roll having a structure formed with a boss and a method for manufacturing the same.
You. [0002] 2. Description of the Related Art Widely used in copiers and laser beam printers.
Generally used electrophotographic recording devices include photoconductors
To charge and expose the photoreceptor
An electrostatic latent image is formed, and then the toner is charged according to the latent image on the photoconductor.
And develop it, then use the toner on the photoreceptor.
Transfer to paper and transfer, then apply a predetermined potential on the photoreceptor
And remove the toner remaining on the photoconductor,
It is also prepared for the next record. Also transfer
Finally, the toner carried on the paper
Is fixed on the paper.
A series of recording operations for is completed. [0003] By the way, the photosensitive member of this electrophotographic recording apparatus
Charging means for applying a predetermined potential to the charging area for the
Applying a predetermined potential to the paper conveyed to the transfer area
Transfer means, or the photoreceptor after transfer
As a static eliminator to make the area uniform at a constant potential,
Corona discharge by applying high voltage of several hundred to several thousand volts to wire
Are widely used.
Commonly used. However, such a corona charging system
In the case of using
Active molecules such as zons can degrade photoreceptors and other components.
Or have a negative effect on the human body.
It is the title. And again, such a method
Is a risk of electric shock due to high voltage,
It also becomes a problem in terms of maintenance and management for contamination, disconnection, etc.
I have. Therefore, there is a difference from such a corona charging system.
For example, by bringing a conductive rubber roller into direct contact with the photoreceptor
Roller-type contact configured to apply a predetermined voltage
A charger (hereinafter referred to as a conductive roll) has been proposed.
You. This conductive roll has higher electric current as the corona charging type.
It does not require pressure and has excellent ozone generation.
It has features. [0006] By the way, this conductive roller
In order to apply a uniform potential to the photoreceptor,
To increase the adhesion between the photoconductor and the photoconductor.
It is an important issue to apply a uniform potential to
Therefore, development of effective means is desired. [0007] Further, in this conductive roll, adhesion
In order to improve the low-molecular weight liquid compound during this production,
For example, if a softener such as oil is mixed in,
And may contaminate the photoreceptor. In the production of this conductive roll, a roll
Conductive powder to impart conductivity to
Leads such as chain black EC and acetylene black
When using conductive carbon, only a small amount of powder is added.
Electrical resistance is large due to various changes or poor dispersion of powder.
May change. In such a conductive roll,
It is extremely difficult to control and adjust the electrical resistance value.
It is difficult to provide a charging voltage characteristic. In addition, in such a conductive roll,
Especially with changes in the external environment, such as humidity and temperature.
The electrical resistance value may change significantly,
It may be difficult to always apply a constant potential. Further, in such a conductive roll,
Whether the material is fragile and easily cracked or worn
May change over time, and the minimum
Departure is desired. By the way, usually, such a conductive roll is manufactured.
As the manufacturing method, rubber or urethane shown in FIG.
Apply a liquid coating material to the foam roller 100 by electrostatic coating.
Wet coating method such as coating, dipping, roll coater, etc.
Is applied by a dry coating method, and then dried to form a coating for resistance adjustment.
The method of forming the covering film 101 (see FIG. 17) is employed.
You. At this time, the coating material adheres to the shaft 102.
17 and the shape of the end portion of the coating film 101 is changed as shown in FIG.
Has the same outer diameter dimension a as the end outer diameter.
And has an inner diameter substantially equal to the outer diameter dimension b of the shaft 102.
Tube 103 over the shaft 102
Is generally performed (FIG. 18). In this way
Mask the shaft 102, apply the coating material, and
After coating or dry coating, the coating formed as shown in FIG.
The film 101 is cut at the portion c, and a masking tube 103 is cut.
Is obtained, the shape shown in FIG. 17 is obtained. By the way, in such masking, photosensitive
Drum and rubber or foam with low electric resistance
To avoid sparking between
The covering must be exposed. However, ama
If the coating film protrudes, it may hit the bearing and break.
Convenience arises. At the time of extrusion, between the tube and the roll
If there is air remaining, the air will expand with the extruded membrane
Phenomena such as blistering are likely to occur, and as a result
Pressure characteristics may deteriorate. Also such masking
In the case of the wet coating method,
Between the king tube 103 and the shaft 102 or
Is the masking tube 103 and the end face of the roller 100
Between the roller 100 end face
Bubbles are formed by exuding the coating on the part,
Easily generate the wafer 101a (see FIG. 20) and a coating film.
There was a problem that 101 was easily cut (see FIG. 21).
See). As described above, there is the pinhole 101a.
As a result, the coating film 101 is cut, and as shown in FIG.
When one end face and the end face of the roller 100 have the same surface shape,
Spark discharge easily occurs at the end of roller 100,
The light drum was damaged. The present invention has been made in view of the above-mentioned conventional disadvantages.
That has high adhesion to the photoreceptor and
Contamination of photoreceptor as much as possible
Minimize changes in electrical resistance due to environmental changes, etc.
With less cracks and wear over a long period of time
It is an object of the present invention to provide a conductive roll having a high resistance. [0017] That is, the present invention provides a core
Conductor is placed around the center of the good conductor shaftPowderTo
CombinationRubbermaterialOr foam injection
Formed or vulcanized by extrusion or molding
Form an elastic middle layerProcess and,During ~Middle classIs shaped
Is formedNot shaft both endsToMasking tubeIn
And expose the exposed part of the shaftMask processingProcess and,During ~while
Coating film with higher specific resistance than layer,Wet coating or dry
By the formula coating methodAround the middle layerFormationAfter that,
Remove the tubing tube,Conductive roller with multiple layersTake
Conductive roll comprising the step of obtainingIn the manufacturing method of
Masking provided on each exposed part of shaft
Tube outer diameter,DuringContact with the masking tube of the interlayer
0.5 to 2.5 mm smaller than the outer diameter of the contact surface
You. Also, a method of manufacturing the conductive roll according to the present invention
The law isHalogenated intermediate layer surface, corona discharge
Is polarized by plasma treatment, etc.
By bonding the polar coating film, the intermediate layer and the coating film can be separated.
Manufacture tightly bonded conductive rollsThings. [0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the accompanying drawings. FIG. 1 relates to the present invention.
FIG. 1 shows a conductive roll according to a first embodiment of the present invention.
The conductive roll of the example is used as a charger for an electronic copying machine
And has flexibility with the shaft 1.
It is composed of an intermediate layer 2 and a coating film 3. The shaft 1 is attached to the core of the conductive roll.
And it is provided along the axis of the shaft.
And is formed in a columnar shape. The intermediate layer 2 is a drum-shaped photosensitive member (hereinafter referred to as a drum-shaped photosensitive member).
Is called a photosensitive drum).
Liquid rubber as softener to solid rubber for 10 to 50 PHR
Formed using the compounded material (hereinafter referred to as rubber roll
Has been called). In other words, this rubber roll 2
Solid polybutadiene rubber and liquid polyisoprene rubber
(Hereinafter abbreviated as IR), specifically,
1,4-polybutadiene 60PHR (Japan Synthetic Rubber
BR02LL manufactured by Co., Ltd.) and liquid polyisoprene 40PHR
(Kuraray isoprene: LIR30) and Ketjen Black
It is formed using EC10PHR as a material. The liquid rubber used has a double bond in the main chain.
Having a number average molecular weight of 10,000 or more
With this molecular weight, most of the
Reacts and binds with the solid rubber and dissolves into the paint.
I can't. The unreacted residue is also high molecular weight.
Hardly dissolves into paint. Therefore rubber with such rubber
Roll 2 is made, and paint is applied on the outer peripheral surface to form a coating film 3.
When a softener is formed on the surface of the coating film
When the rubber roll 2 comes in contact with the photosensitive drum
It is less likely to contaminate the drum. Also, the liquid
Liquid rubber and liquid BR can be used as the rubber-like rubber.
Liquid IR is preferred. Also make solid BR and liquid IR
With a large amount of liquid IR
Low adhesion to banbury and rolls even when rendered.
Good mold release during vulcanization, fast vulcanization, vulcanized material
Are characterized by low compression set. In order to make such a rubber roll,
Usually, since the electrical resistance of rubber is high,
It is necessary to lower the electrical resistance (hereinafter referred to as conductive
The conductive rubber body of this embodiment has a conductive property.
Powders, that is, various metal acids whose surfaces have been treated for conductivity
Oxides such as Ketjen Black EC
Mixing zinc, titanium oxide, tin oxide, etc. and carbon black
It is configured so that the resistance can be lowered by
Have been. Also, depending on what is used, a rubber roll
10 resistance^Four-10⁷The specific narrowness of the semiconductor region of about Ω
Need to be kept within the
Use conductive carbon such as check EC or acetylene black.
If used, the amount of conductive powder added may be slightly displaced or poorly dispersed.
The resistance changes greatly with the
Hard to handle. So, rather than these,
Undeveloped, low-conductivity SAF, ISAF, HA
For normal rubber such as F, MAF, FEF, GPF, SRF
When carbon is used, the resistance becomes stable. However,
It is necessary to mix a large amount of carbon to lower the resistance.
And the hardness of the rubber increases. Like this
Rubber with low hardness and low resistance
To make it, Ketjen Black, Acetylene Black
Conductive carbon such as rubber and ordinary rubber car as described above
It is effective to combine with carbon for paint or carbon. Ma
Also, the cost is considerably higher than carbon black
However, even if a conductive metal oxide as described above is used, a low hardness
Rubber controlled to a specific resistance in the semiconductor area
Can be made. In other words, this is
Lack of reinforcement and its conductivity is higher than conductive carbon
Because there is no. The intermediate layer is particularly suitable for this embodiment.
It is not limited to those of
Recon rubber, urethane rubber, BR urethane, no sole
Or non-foamed elastic material such as rubber (polynorbornene rubber)
It may be a foamed elastic body or the like. The coating film 3 is made of epichlorohydrin,
Rubber, adhesive silicone rubber, chlorsulfonated
Polyethylene, fluoroolefin vinyl ether
Combined, one-part or two-part polyurethane, N-Methoxy
Various materials such as modified nylon such as cimethyl nylon are used.
Which can be bonded to a polarized rubber surface
It is. The coating film 3 alone has a necessary resistance value.
If not, separate the conductive powder.
You may make it scatter and adjust a resistance value. Therefore, according to the first embodiment, the intermediate layer
By using the material described above as 2
After kneading with a kneader or Banbury mixer
Can be easily taken out. Also use this material
As a result, mold release after vulcanization is very good and
Can be easily removed without damaging the tool. It should be noted that the conductive roll of the present invention can be applied by wet coating.
It may be manufactured by any of the methods or the dry coating method. For example
Even if dry coating is applied, the liquid rubber does not transfer to the coating film.
To prevent the film from migrating contaminants on the photosensitive drum
There is no necessity, and the selection range of the film is expanded. Next, a conductive roller according to a second embodiment of the present invention will be described.
Will be described. FIG. 2 shows a second embodiment according to the present invention.
1 shows a conductive roll of an embodiment,
As for the roll, the surface of the rubber roll 4 constituting the intermediate layer is made of chlorine.
Halogen gas such as gas or NN-dichloroparatolue
Sulfonic acid amide, trichloroisocyanurate, etc.
Halogenating using an organic halogenating agent
And the electrical resistance of the rubber roll 4
Can be increased. In other words,
Rule 4 is, for example, 10^ThreeLow with an electrical resistance of Ω or less
By halogenating^FourΩ electrical resistance
It can be a roll with resistance. Also this rubber low
4 is the conductive powder for adjusting the specific resistance used in the first embodiment.
An even higher resistance analogy when used in combination with powder
10^Five-10⁷You can also make Ω rolls. In addition,
The rubber roll 4 is subjected to a halogenation treatment and a roller during the production.
Surface treatment by polarity treatment such as plasma discharge or plasma discharge.
The surface is polarized. The coating film 5 of the second embodiment includes:
Urethane, nylon, epichlorohydrin rubber, acrylic
The use of polar materials such as rubber
Adhesion to the rubber roll 4 whose surface is polarized can be easily performed.
It has become. These materials are wet or dry
It can be coated by any method.
Even with these methods, the rubber roll 4 and the coating film 5 are bonded.
To suppress fluctuations in resistance, such as changes over time in resistance.
Can be. Accordingly, the conductive roll of the second embodiment
Controls the internal resistance of the rubber roll 4 as the intermediate layer.
Can be used to make conductive rolls with specific resistance
The resistance ratio between the rubber roll 4 and the coating film 5 can be freely controlled.
Can be controlled. And at the time of use, this conductive roll
The voltage applied to the body depends on the resistance ratio
Since it is applied to the film 5, the coating film 5 has sufficient resistance
When there is no voltage, the ratio of the internal resistance on the intermediate layer side
By increasing the rate, the withstand voltage of the entire roll can be increased.
it can. Next, a conductive roller according to a third embodiment of the present invention will be described.
The rule will be described with reference to FIG. This third
The conductive roll of the embodiment is the same as the first embodiment as an intermediate layer.
Rubber roll 6 softened by the same softener is used.
The coating film 7 is made of one-component urethane.
Rimmer is used. The coating film 7 is made of one-component urethane.
Firmly adheres to the rubber roll 6 which has been softened by
Especially when mixed with conductive powder.
Ester urethane and ether urethane with adjusted resistance
It has been found that all of these have high withstand voltage. An example
For example, the volume resistivity is 10⁸-10^TenFilm thickness around Ωcm
When the thickness is 100 to 200 μm, the withstand voltage characteristic is 1.5 to 2.5.
It has about KV. The resistance of the coating film 7
For the alignment, a conductive metal oxide such as zinc oxide, oxide
Dispersion of conductive powder such as titanium, tin oxide and carbon black
Has been made by And, for example, this carbon block
When using a rack, Ketchen Black EC or
Not a highly conductive carbon like acetylene black
D such as SAF, ISAF, HAF, MAF, FEF
BP oil absorption (ASTM D2414) of about 150 or less
Structured rubber carbon or paint
By using carbon, the volume resistivity of the film is reduced to 10
⁶-10^TenControl to a specific value in the semiconductor area of about Ωcm
Is possible. Research and experiments by this inventor
As a result, DBP absorption was particularly observed in ester-based one-part urethane paint.
Disperse carbon black for paint with oil amount of about 50 to 130
If the paint has been treated and acidified
Bon Black has good compatibility with urethane and is very dispersed
Is good, so it is possible to make
It turned out to be. Next, a fourth embodiment according to the present invention will be described.
The roll will be described with reference to FIG. This fourth
In the conductive roll of the embodiment, the coating film 8 is mixed with hydrophobic silica.
Is used. Usually, in general,
Resistance depends greatly on the humidity of the environment in which it is
May exceed the proper range within the environmental conditions used.
There is. Therefore, the inventor made various attempts.
As a result, hydrophobic silica is used for paint (silicone oil is used for silica)
) Is mixed with about 5 to 50 PHR.
It turns out that the change in resistance is reduced. That is
This is because silicone oil makes the entire coating film water repellent.
This is because that. The coating film is generally made of silicon oxide.
If the file itself is mixed, it bleeds from the film and
Causes problems such as contamination of the ram.
Bleed does not occur,
It is also convenient in that respect. Next, a fifth embodiment of the present invention will be described.
This will be described with reference to FIG. The conductive roller of the fifth embodiment
Is a conductive powder for adjusting the resistance of the coating film 9.
Uses conductive tin oxide doped with antimony oxide
Have been. Accordingly, the conductive roll of the fifth embodiment is
According to this, the particle size of the tin oxide is as small as 0.1 μm or less.
And the dispersibility is very good.
To easily control the resistance of coating film 9
can do. Also, this tin oxide is spherical
And the anisotropy of the film resistance due to the change of the shear during processing
Hardly appears, and therefore exhibits good properties as a roll
can do. Next, a sixth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The conductive row of the embodiment of FIG.
6 is N-methoxymethyl as a material for forming the coating film 10.
Modified nylons such as nylon are used.
Then, the inventor uses the conductive roll of the sixth embodiment.
After conducting various experiments, the coating film 10 was applied to the photosensitive drum.
When contacted in close contact and left for one month,
It was found that there was no contamination on the drum. Next, a conductive roller according to a seventh embodiment of the present invention will be described.
The rule will be described with reference to FIG. This seventh
In the conductive roll of the embodiment, the coating film has the upper layer 11 and the lower layer 12.
And a two-layer structure. The upper layer 11 is somewhat hard and has a low withstand voltage.
Material that does not contaminate the optical drum at all
It is designed to be coated thinly. And in this embodiment
The upper layer 11 is made of, for example, N-methoxy
When modified nylon such as methyl nylon is used,
And tin oxide doped with antimony oxide
And the external environment such as humidity (for example,
(For example, 82.5% RH at 32.5 ° C to 10% RH at 15 ° C)
Will not adversely affect the recorded image
I have. In addition, denaturation like N-methoxymethyl nylon
Nylon is a suitable material for the upper layer as described above.
But thisLaDoes not crosslink at allAnd close contact with the photosensitive drum
Is poor, and if crosslinked too much, the membrane becomes brittle and wears
Easily, cracks on the surface, lowers the electrical resistance
thing,Electric resistance increases even with conductive powder
There are drawbacks such as a tendency to break. Therefore, the degree of cross-linking of these coating films is appropriately controlled.
By controlling, for example,
Is carried out by an acid catalyst or heating,
Can be greatly improved
You. The lower layer 12 is soft and has good withstand voltage.
And causes contamination of the rubber or foam of the intermediate layer 2
About 50-200 μm using a material that does not transmit
It is a configuration that is thickly coated each time. Especially in this embodiment
The material of the lower layer 12 may be one-component or two-component polyurethane.
Tan, epichlorohydrin rubber, acrylic rubber, chlor
Sulfonated polyethylene, modified nylon and the like are preferred. The upper layer 11 and the lower layer 1 constituting the coating layer
2, the resistance value of the upper layer 11 is represented by R₁,
The resistance value of the lower layer 12 is R_TwoThen (R_Two/ R₁)> 1 It is desirable to make the effect of temperature and humidity effective.
Can be effectively suppressed. Accordingly, the conductive roll of the seventh embodiment is
According to this, the lower layer 12 as a coating film and the thickness of the lower layer 12
By forming the upper layer 11 having a lower resistance value,
The environmental dependence of the resistance of the electric roll can be reduced.
That is, as shown in FIG.
The contact resistance of the layer 12 is reduced through a film having a low resistance value,
Because it can be lowered by
FIG. 8 is a semi-log scale, and the roll resistance on the vertical axis side is shown.
The resistance value is shown in logarithm). Next, an eighth embodiment according to the present invention will be described.
This will be described with reference to FIG. The conductivity of the eighth embodiment
The roll has a resistance ratio of the intermediate layer 16 and the coating layer 17 of 1:
The specific resistance is adjusted to 1.5. Middle layer 1
No. 6 is carbon to polybutadiene and liquid polyisoprene
Is mixed and formed by injection molding, roll resistance
(A 1cm width aluminum foil is wrapped around the outer surface and a voltage of 1KV is marked.
1 × 10)⁸Configuration with Ω
ing. The coating layer 17 is formed on the outer peripheral surface of the intermediate layer 16 by 80
μm thickness is formed by applying polyurethane paint with carbon
And a roll resistance of 1.5 × 10⁸Ω
Configuration. Therefore, the conductive roll according to the eighth embodiment
1.5 between the intermediate layer 16 and the coating layer 17.
I applied a high voltage of KV, but it did not cause voltage breakdown.
Was confirmed. Next, a ninth embodiment according to the present invention will be described.
This will be described with reference to Table 1. In the ninth embodiment,
When the interlayer contains solid rubber and liquid rubber as a softener
(A) and (b) when the intermediate layer does not contain liquid rubber
For both, ketch which is conductive carbon (c) respectively
Enblack EC and non-conductive carbon (d) HA
Measure hardness and resistance when F is mixed
As a result, data as shown in the following Table 1 was obtained. From Table 1, the solid rubber and the liquid rubber are
When used together, the hardness is low and the resistance is stable.
(BR) 70PHR as liquid rubber
And liquid polyisoprene (LIR) 30PHR,
Low electric resistance can be obtained even with a small amount of carbon.
It turned out to be. Therefore, according to the ninth embodiment, the soft
Vulcanized rubber with good conductivity can be produced. In the ninth embodiment, liquid rubber is used.
In the case of containing (a), polybutadiene (BR) 70PHR
And liquid polyisoprene (LIR) 30PHR
The rack is kneaded with a banbury and press vulcanized to form a sheet.
Made and measured hardness and resistance. Also contains liquid rubber
In case (b) does not exist, styrene butadiene rubber (SB
R), natural rubber (NR) with carbon black
And press vulcanization to make a sheet, hardness and resistance
Are measured. [0051] [Table 1]Next, a tenth embodiment according to the present invention will be described.
This will be described with reference to Table 2. This tenth embodiment
Has a configuration in which the surface of the intermediate layer is polarized.
It has become. In this embodiment, such a configuration is used.
With two treatment methods, namely trichloroisocyanurate
(E) when immersed twice in 4% acetone
Immersed twice in 4% ethyl acetate of chloroisocyanurate
(F) and the roll resistance before and after the treatment
(A roll of 1cm width aluminum foil is applied to the roll and a voltage of 1KV is applied.
Measurement), the results are as shown in Table 2.
The fruit was obtained. From Table 2, it can be seen that the polarization process is performed.
Can increase the specific volume resistance, in other words,
That it becomes possible to control the resistance of the intermediate layer.
You. This means that the treatment agent impregnates the interior of the
Because a tens of microns of polarized layer is formed on the surface.
is there. Further, by performing this polarization processing,
It is difficult to attach garbage with reduced surface tackiness
Can be easily bonded to a polarized coating film
Become. In this embodiment, the case of (e) is used.
Cis 1,4-polybutadiene 60PH
R (BR02LL manufactured by Nippon Synthetic Rubber Co., Ltd.), liquid polyiso
Plen 40PHR (LIR3 manufactured by Kuraray Isoprene Co., Ltd.)
0), Ketjen Black EC (Ketjen Black)
・ International Corporation) 10PHR and vulcanizing agent B
After kneading with a mold banbury, it was injection molded. Ma
The material used in (f) was cis 1,4-polybutadiene.
70PHR, liquid polyisoprene 30PHR, Ketjen
Kneading black EC8PHR and vulcanizing agent with B-type Banbury
Then, it is formed by injection molding. [0056] [Table 2]Next, an eleventh embodiment according to the present invention will be described.
Will be explained. In the eleventh embodiment, the conductive roll
The layer is made of carbon butadiene and liquid polyisoprene.
It is formed by mixing a rack and a vulcanizing agent and injection molding.
is there. This is trichloroisocyanurate acetone 2
% Solution, and the carbon-containing thermoplastic
Apply a conductive urethane paint and dry to form a coating film
Was. The conductive roll formed in this way is
When I left it in the laboratory for one month, the roll resistance was
2.2 × 10^FiveWhat had Ω was 2.3 × 1
0^FiveΩ, and it was found that there was almost no change. Cause
And formed in the same manner as the same material without performing the polarization treatment.
The roll resistance was measured after leaving the
First, 2.0 × 10^FiveWhat was Ω is 1.0 × 10
⁶It turned out to change greatly to Ω. Therefore, according to this embodiment, the resistance
Over time can reduce the occurrence of aging over time.
I understand. That is, this is because the intermediate layer and the coating film are firmly connected.
Because of the poor adhesion, slight
The component bleeds from the intermediate layer into the
That is prevented. In addition, the intermediate layer
Prevents displacement and wrinkling of the coating film when bonding the coating film
Therefore, disturbance of the image at the time of copying can be prevented. Next, a twelfth embodiment according to the present invention will be described.
Will be explained. The conductive roll of this embodiment has a coating film
For polymers using liquid urethane or two-part urethane
Particularly, in this embodiment, the main component of urethane is
The chains are formed by adipates. That is, the conductive roll of this embodiment is provided with an intermediate layer
As polybutadiene and liquid polyisoprene to carbon
Add black and vulcanizing agent, knead and injection mold
The formed one is used. Formed in this way
In the middle layer, trichloroisocyanurate acetone 2%
Thermoplastic urethane treated with solution and carbon dispersed
Applying a paint (P22S manufactured by Milactran),
It is configured to be dried to form a coating film of 4 μm.
You. The conductive roll formed as described above is
Stress corrosion cracking of photoreceptor made mainly of carbonate
As a result, a conductive row with a urethane coating film was
If the printer is in close contact with the photoreceptor, the
No occurrence was observed. In addition, it consists only of the middle layer
When the object is brought into close contact with the photoreceptor, the intermediate layer
Cracks occurred. From this experiment, urethane was partially crystallized.
High strength, and a bonded intermediate layer, that is, rubber
It turns out that it adheres firmly to the roll. Also, this ure
Tan has a high withstand voltage and is made of carbon or conductive metal oxide.
High withstand voltage can be exhibited even when the resistance is matched to the conductor area
In particular, the withstand voltage of adipic acid ester is excellent
Is what it is. Next, a thirteenth embodiment according to the present invention will be described.
Will be explained. The conductive roll of the thirteenth embodiment has a coating
The film is made of ester-based one-part urethane paint with DBP oil absorption of 13
Composition in which about 0 to 50 carbon black for paint is dispersed
In particular, by adopting such a configuration,
It is possible to obtain a stable resistance film with little variation.
It has been confirmed by research and experiments by the inventor. That is, in this embodiment, a coating film was used.
To form an ester of 1,4-butanediol and adipic acid.
MDI (4,4-diphenylmethane diisocyanate)
One-component polyurethane with chain extension by Nippon Milactone Co., Ltd.
(Product name P22S) 100 PHR is changed to 16 of dioxane / MEK.
%, The average particle size of 22 μm,
100ml / 100g oil, PH 3.5 carbon
(Mitsubishi Kasei Co., Ltd. MA100) with 18PHR
The fee was used. And the conductive roller of this embodiment
Wrote this paint with a trichloroisocyanurate solution.
The halogenated intermediate layer has a thickness of about 200 μm.
Apply and coat at 120 ° C for 5 hours
It was done. In addition, it is used as a coating film in this embodiment.
Create several 100μm thick films from the paint
After drying at 120 ° C for 5 hours, the volume resistivity was measured.
6.0 × 10⁸−8.0 × 10⁸Narrow
The fact that it falls within the range with good reproducibility is the result of this inventor.
It was confirmed from experiments and measurements. Also like this
The conductive roll on which the paint was applied
While applying a DC voltage while conducting a withstand voltage experiment,
It was confirmed that voltage breakdown did not occur at 2.0 KV.
At least 2.0 KV or more
Revealed. Next, a fourteenth embodiment according to the present invention will be described.
Will be described. The conductive roll of the fourteenth embodiment has a coating
A film mixed with hydrophobic silica is used as a film.
As a result, as shown in Table 3 below, environmental changes in resistance
It was confirmed that the conversion was reduced. In this embodiment, the intermediate layer is used.
Carbon bra with polybutadiene and liquid polyisoprene
Rubber roll formed by injection molding with a rubber and vulcanizing agent
You are using And the conductive roll of this embodiment is:
The intermediate layer formed in this way is
Treated with a 2% solution of acetone in
Trade name SS10 manufactured by Nippon Silica Co., Ltd.
Thermoplastic with carbon containing 10PHR
Applying urethane paint and drying to form a coating film
Configuration. [0069] [Table 3] Next, a fifteenth embodiment according to the present invention will be described.
Will be described. The conductive roll of the fifteenth embodiment is
Coating has tin oxide doped with antimony oxide
It has a configuration. That is, the conductive roll of this embodiment is:
Conductive tin oxide is used as the coating film.
It has been found that the following effects can be obtained. The tin oxide particle size contained is 0.1 μm or less
And the dispersibility is very good.
The resistance value of the coating film can be easily adjusted by changing
Can be controlled. In addition, tin oxide has a spherical shape, so it takes a large share in processing.
The anisotropy of the film resistance due to the
Good characteristics can be exhibited as a tool. The conductive roll according to this embodiment and various types
The present invention relates to a conductive roll having a coating film formed of a material.
The developer rolls in the machine to perform various experiments.
When I used it as an image,
Quality insights were obtained. [0073] [Table 4] Further, similarly, tin oxide is added to the modified nylon.
When applied to the upper layer of a two-layer coating film,
Put various other materials in the modified nylon and put it on the upper layer of the coating film.
In the same way, the results shown in Table 4 were obtained in the case of coating.
Was also obtained. Next, a sixteenth embodiment according to the present invention will be described.
Will be described. The conductive roll of this embodiment has a coating film shape.
Use modified nylon as the material,Modified deny
Ron'sHigh degree of cross-linking, high adhesion to photosensitive drum, brittleness
It has a configuration that has a predetermined value in consideration of prevention and high withstand voltage.
ing. That is, the conductive roll coating film of this embodiment
Is N-methoxymethyl nylon as a modified nylon
Using (Tradein EF30T, trade name, manufactured by Teikoku Chemicals)
Other than this, for example, N-methoxymethylated copolymer
Nylon (trade name G550, manufactured by Teikoku Chemical Co., Ltd.)
Copolymerizable amide (AQ nylon P-7, trade name, manufactured by Toray Industries, Inc.)
0), softened Neil, copolymerized with polyether and polyester
(Trade names Pebax 2533, 3533, manufactured by Toray)
May be. The N-methoxy used in this Example
Modified nylon such as methyl nylon is used as the upper layer of the coating film.
Are suitable materials, but they are not crosslinked at all.
To light drumofClose contactPoorThat the membrane is too cross-linked
It becomes brittle and easily wears, cracks on the surface,
Deterioration of electric resistance, even if conductive powder is added
Has the drawback that the resistance tends to be too high, etc.
ing. Then, from such circumstances, the present inventor
Conducted various studies and found that the degree of crosslinking of the coating film was controlled.
Control of the degree of crosslinking, for example,
The above drawbacks are greatly improved by using a medium or heating.
It has been found to be. Therefore, it is used for the coating film of this embodiment.Frame
bridgeForm using the same as N-methoxymethyl nylon
Let the product adhere to the photosensitive drum and leave it for one month
As a result, it was found that there was no contamination on the photosensitive drum. Next, a seventeenth embodiment according to the present invention will be described.
Will be described. The conductive roll of the seventeenth embodiment is
The covering film is composed of an upper layer and a lower layer. The upper layer is made of a material having no contamination adhesion to the photosensitive drum.
Formed on the outer peripheral surface of the lower layer with a thickness of 3 to 50 μm
Especially, in this embodiment, the same as the seventh embodiment is used.
Modified nylon is used. And in this embodiment
Because the upper layer is formed thinner than the lower layer, it is slightly harder and withstands voltage.
May be lower. The lower layer is soft as in the seventh embodiment.
With good electric resistance, and rubber or foam in the middle layer
Does not transmit materials that cause contamination of the photosensitive drum inside
Using the material, the outer periphery of the middle layer thick to about 50 to 200 μm
It has a configuration formed on the surface. In other words, this lower layer
Is a soft thermoplastic urethane with a JISA hardness of around 80 degrees.
Tongue, which has good electric resistance,
Also cause contamination of the photosensitive drum with rubber and foam in the middle layer
There is no danger of permeating the material. Therefore, according to the seventeenth embodiment, the upper layer
By separating and sharing the functions of the
The range of choice of materials used for each layer has been greatly expanded
It is. In addition, carbon for paint is dispersed in the lower layer.
Coating with a one-part urethane paint
Although it is easy to align, the orientation of carbon in the axial direction is
If there is a pinhole on the photosensitive drum,
Causes poor electrification in all directions, easily causing black lines on the image
I knew it. In particular, fluctuations in roll resistance due to the environment and
Roll resistance is reduced (3 ×
10^FiveΩ or less)
found. Therefore, the inventor conducted various experimental studies.
After coating with the one-part urethane paint,
Resin with conductive tin oxide dispersed is about 3-20 μm
By coating, the generation of black lines can be suppressed.
Was. This is because tin oxide has a fine spherical shape.
The reason is that the direction is small. Conductive tin oxide
Is significantly more expensive than carbon, but carbon
Use a cheap conductive material such as
m) Using expensive but high-performance conductive materials
Thus, a high-performance charging roll can be manufactured at low cost. Further, in this embodiment, particularly high withstand voltage
When applying pressure characteristics, increase the roll resistance of the lower layer only.
(3 × 10^FiveΩ or more). However, this
The roll resistance has an environmental dependence.
By lowering the specific resistance of the upper layer film
Can greatly reduce external environmental dependence such as humidity.
You. The roll resistance of only the lower layer is 2 × 10^FiveΩ or less
If lower, the resistivity of the upper film is lower than the resistivity of the lower film.
It has little external environment dependence. Also, distribute conductive powder.
The combined urethane has high specific resistance under high humidity, but the conductive powder
The modified nylon blended with the compound has a low specific resistance under high humidity. Obedience
Two layers with urethane as the lower layer and modified nylon as the upper layer
It is particularly preferable to use a coating, which depends on the environment of the conductive roll.
Sex can be reduced. Next, according to the first embodiment of the present invention,
The manufacturing method of the roll will be described with reference to FIGS.
I will explain it. (1) First, a metal shaft 1 having an outer diameter of 8 mm was introduced.
An electrically conductive adhesive 13 is applied (see FIG. 9). In other words, this
This makes the shaft 1 and the rubber roll 2 'adhere firmly,
Improves the durability during rotation, and uses the rubber
The contact resistance between the contact hole 2 'and the electric resistance
In order to eliminate the problem. (2) Next, an image is formed around the shaft 1.
Injection molding or extrusion molding, outer diameter 15
A rubber roll 2 ′ having a diameter of 2 mm is formed and vulcanized (see FIG. 10).
The rubber material used at this time should be
Liquid rubber is used as a softener on the solid rubber to prevent oozing.
Mixed and mixed with a conductive material.
use. (3) At both ends of the shaft 1, polypropylene
Tube 14 made of 6 mm inside diameter and 9 mm outside diameter
11). The material of this tube 14 contaminates the coating solution.
Non-dyed, elastically gripping the shaft
Is good. At this time, to prevent the occurrence of pinholes,
The difference in outer diameter between the rubber roll 2 'and the tube 14 is 0.5
It is desirable to secure at least mm. Especially to create a pool
It is preferable to secure 0.25 mm or more as the step S of
New (4) Thereafter, foreign substances on the surface of the rubber roll 2 'are removed.
Pure water or methanol, toluene, etc. to remove
Wash and dry. (5) The rubber roll 2 'and the coating film 3
Halogen gas or organic halogen to adhere
The surface of the rubber roll 2 is polarized with an agent. Ie this
Represents a slight air flow between the comb roll 2 'and the coating film 3.
With a layer, the withstand voltage characteristics are inferior and the
This is because the coating film 3 is firmly attached to the rubber roll 2 ′.
This is because it is important to adhere to them. (6) Next, one end of the rubber roll 2 'is held.
Then, stand vertically and dipping in the coating material solution 15
(See FIG. 12). This coating material solution is carbon, graph
Graphite and metal oxides made conductive, that is, titanium oxide,
Using zinc oxide, tin oxide, etc. as conductive materialConductiveUrethane
preferable. This urethane is soft and halogen-based
It adheres well to the rubber roll 2 so that it can be coated with a conductive roll.
It is a suitable material for
B or nylon may be used. In the case of foam
Is a roll coater that can be used with relatively high viscosity coating material solutions.
A coater method such as a coater or a knife coater is suitable. (7) Then, the rubber roll 2 'and the mass
When the king tube 14 is heated and dried, the coating film 3 is removed.
The roll end is changed from the state shown in FIG. 13 to the state shown in FIG.
The fillet A is changed as shown. This file
Let A improves the withstand voltage characteristics at the end as described above
Help to do. Note that the coating material is melted by turning the rubber roll vertically.
When applying and drying the solution, extra
The adhering coating material solution gradually drops on the side of the rubber roll during drying.
May cause unevenness in the thickness of the coating film 3.
The outer diameter difference between the rubber roll and the tube to 2.5mm or less
Is preferred. (8) Finally, a circle is formed on the portion B of the coating film 3.
Make a wound with a knife over the entire circumferential direction (see FIG. 14).
Remove the king tube (see FIG. 15). [0094] As described above, the conductive row according to the present invention is
Are used for development, charging, and static elimination used in electrophotographic recording devices.
Useful as a conductive roll for printing, transfer, etc.
For applying or removing a potential to the photoconductor of the machine.
Suitable.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conductive roll of a first embodiment according to the present invention. FIG. 2 is a sectional view showing a conductive roll according to a second embodiment of the present invention. FIG. 3 is a sectional view showing a conductive roll of a third embodiment according to the present invention. FIG. 4 is a sectional view showing a conductive roll according to a fourth embodiment of the present invention. FIG. 5 is a sectional view showing a conductive roll according to a fifth embodiment of the present invention. FIG. 6 is a sectional view showing a conductive roll according to a sixth embodiment of the present invention. FIG. 7 is a sectional view showing a conductive roll of a seventh embodiment according to the present invention. 8 is a graph showing a change in resistance value with respect to each temperature and humidity change in an upper layer and a lower layer of a coating film in the conductive roll of the seventh embodiment shown in FIG. FIG. 9 is a process chart showing a method for manufacturing a conductive roll according to the present invention. FIG. 10 is a process chart showing a method for manufacturing a conductive roll according to the present invention. FIG. 11 is a process chart showing a method for manufacturing a conductive roll according to the present invention. FIG. 12 is a process chart showing a method for manufacturing a conductive roll according to the present invention. FIG. 13 is a process chart showing a method for manufacturing a conductive roll according to the present invention. FIG. 14 is a process chart showing a method for manufacturing a conductive roll according to the present invention. FIG. 15 is a process chart showing a method for manufacturing a conductive roll according to the present invention. FIG. 16 is a process chart showing a conventional method for manufacturing a conductive roll. FIG. 17 is a process chart showing a conventional method for manufacturing a conductive roll. FIG. 18 is a process chart showing a conventional conductive roll manufacturing method. FIG. 19 is a process chart showing a conventional method for manufacturing a conductive roll. FIG. 20 is an explanatory view showing a defect of a conventional conductive roll. FIG. 21 is an explanatory view showing a defect of a conventional conductive roll. [Description of Signs] 1 Shaft 2, 16 Intermediate layer 3, 5, 7, 8, 9, 10, 17 Coating film 4, 6, 13, 18, 2 'Rubber roll 11 Upper layer (coating film) 12 Lower layer (coating) Coating)

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-64-73364 (JP, A) JP-A-64-66674 (JP, A) JP-A-59-46664 (JP, A) JP-A-51-466 59636 (JP, A) JP-A-60-150071 (JP, A) JP-A-63-179959 (JP, A) JP-A-59-172666 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) G03G 15/02 F16C 13/00 G03G 15/08 G03G 15/16

Claims (1)

(57) [Claim 1] A rubber material or a foam containing a conductive powder is formed by injection molding or extrusion molding on the outer periphery of a central portion of a shaft of a good conductor provided on a core portion.
Vulcanized to form an intermediate layer having and elastic conductive
A step, the shaft ends which are not middle-layer is formed by coating with a masking tube and masking the exposed portion of the shaft Engineering
And degree, the than middle-layer high resistivity coating film, after forming the intermediate layer outer periphery by wet coating or dry coating, the Ma
Remove the king tube and remove the conductive roller
In conducting roll manufacturing method comprising the step of acquiring the outer diameter of the masking tube respectively provided on the exposed portion of the shaft ends, than the contact surface outside diameter of the masking tube middle tier 0.5-2. A method for manufacturing a conductive roller, wherein the conductive roller is reduced by 5 mm. 2. A Rikongomu, urethane rubber, BR urethane, non-foamed elastic body Norsorex (polynorbornene rubber), or the elastic foam, Ketjen Black
Click, mixed with conductive carbon such as acetylene black, a conductive powder annexed and Stora <br/> puncture over Rubber carbon or paint <br/> carbon not developed in the form of intermediate layer
The method for producing a conductive roll according to claim 1, wherein: 3. A ketambler for a rubber material containing solid rubber and liquid rubber mixed as a softener into the solid rubber.
Click, and conductive carbon such as acetylene black, rubber carbon or paint not developed stringent <br/> Rakucha over
Mixed with a conductive powder which merges and use carbon, conductive manufacturing method of a roll according to claim 1, characterized in that form an intermediate layer <br/> form. Characterized in that to control the electrical resistance of the intermediate layer by treating halogenated using a halogen gas or organic halogenating agent wherein prior Symbol intermediate layer surface
The method for producing a conductive roll according to claim 1 . 5. After forming the intermediate layer, the surface of the intermediate layer is polarized.
The method according to any one of claims 1 to 4, wherein
A method for producing the conductive roll according to the above. 6. The surface of the intermediate layer is halogenated,
The polarity by Na discharge or plasmas processing or the like, further
Characterized in that a polar coating film is adhered to this surface
A method for manufacturing a conductive roll according to claim 5. 7. A shaft of a good conductor provided on a core portion, a conductive and stretchable intermediate layer provided on an outer periphery of the shaft, and a specific resistance higher than that of an intermediate layer provided on an outer periphery of the intermediate layer. A method of manufacturing a conductive roller having a high coating film and applying a potential of a predetermined polarity while being in contact with a photoreceptor or a transfer sheet, comprising: After forming and vulcanizing the foam by injection molding or extrusion molding to form an intermediate layer, the surface of the intermediate layer is polarized by a halogenation treatment, corona discharge or plasma treatment, and further a polar coating film is formed on the surface. A method for producing a conductive roll, comprising: 8. A Rikongomu, urethane rubber, BR urethane, non-foamed elastic body Norsorex (polynorbornene rubber), or the elastic foam, Ketjen Black
Click, mixed with conductive carbon such as acetylene black, a conductive powder annexed and Stora <br/> puncture over Rubber carbon or paint <br/> carbon not developed in the form of intermediate layer
The method for manufacturing a conductive roll according to claim 7 , wherein: A rubber material containing a liquid rubber to be mixed as 9. Solid shaped rubber and a softening agent in this solid rubber, Ketchenbura
Click, and conductive carbon such as acetylene black, rubber carbon or paint not developed stringent <br/> Rakucha over
Mixed with a conductive powder which merges and use carbon, conductive manufacturing method of a roll according to claim 7, characterized in that form the intermediate layer <br/> form. 10. The surface of the intermediate layer is formed with a halogen gas.
Must be halogenated using an organic halogenating agent
The electrical resistance of the intermediate layer is controlled by
The production of the conductive roll according to any one of claims 7 to 9.
Construction method. As the material of 11. The coating film, while using a crosslinking modified nylon, the method of the conductive roll manufacturing according to any one of claims 1 to 10, characterized in that a mix of hydrophobic silica . 12. A conductive urethane as a material of a coating film.
Claim 1, feature 10 of the use of
2. The method for producing a conductive roll according to claim 1. 13. An ester-based one-part urethane paint having DB
Carbon oil for paint with P oil absorption of about 50 to 130
The conductive roller according to claim 12, which is dispersed.
Manufacturing method of the tool. 14. The coating film according to claim 1, wherein said coating film is formed of a relatively hard and thin upper layer which does not contaminate a photoreceptor or a transfer sheet and a relatively flexible and thicker lower layer having good electric resistance. The method for producing a conductive roll according to any one of claims 1 to 10, wherein the conductive roll has a two-layer structure and uses a crosslinked modified nylon as a material for forming the upper layer. 15. A one-pack or two-pack polyurethane, d.
Pyrochlorohydrin rubber, acrylic rubber, chlorsulfo
Polyethylene or modified nylon as the lower layer material.
The method for producing a conductive roll according to claim 14, wherein:
Law.