JP2002302287A - Medium conveying belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medium conveying belt having a high ink cleaning function and an electrostatic attracting force. SOLUTION: In a resin laminating body, an electrode pattern having conductivity is formed on the outer peripheral surface of a pipe-like material molded of polymeric material, and one or more electrode protective layers are formed on the outer peripheral surface. In the medium conveying belt, a drop angle of water is 45 deg. or less on the outermost peripheral layer surface of the electrode protective layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium transport belt, and more particularly, to paper or O.D. in an electrophotographic apparatus such as a copying machine, a laser beam printer, or a facsimile.
It relates to a media transport belt used for transporting media such as HP films, or a media transport belt used for transporting paper or OHP film or drying in an inkjet printer device or a bubble jet (registered trademark) printer device. is there.

[0002]

2. Description of the Related Art Generally, as a medium transport belt used in an electrophotographic apparatus such as a copying machine, a conductive electrode pattern is provided on the outer peripheral surface of a tubular material made of a polymer material, and this electrode pattern protects the electrode. Media transport belts protected by layers are known.

When the medium transport belt is used for transporting or drying a medium such as paper or OHP film in an ink jet printer or a bubble jet printer, ink may adhere to the belt surface. Therefore, it is necessary to remove the ink with a blade, a brush, a web, or the like.

[0004]

However, the work of removing ink with a blade, a brush, a web, or the like cannot remove all of the ink, but rather spreads some of the ink on the belt surface.
There was a problem.

An object of the present invention is to provide a medium transport belt having excellent ink cleaning properties by facilitating removal of ink attached to the belt surface.

[0006]

In order to achieve the above object, the gist of the present invention is to provide a resin laminated belt having at least one electrode protective layer on a resin film having an electrode pattern on its surface. Wherein the falling angle of water on the outermost layer surface of the electrode protection layer is 45 ° or less.

Further, the gist of the present invention is a resin laminated belt in which at least one electrode protective layer is present on a resin film having an electrode pattern on a surface,
The outermost layer of the electrode protective layer is a medium transport belt, wherein the outermost layer is made of a polymer resin composition having a side chain composed of a silicone group.

[0008] The polymer resin composition may be an acrylic resin composition. The polymer resin composition may be a fluorine-based resin composition.

When the outermost layer of the electrode protective layer of the medium transport belt is made of the above-mentioned polymer resin composition, the falling angle of water of the outermost layer of the electrode protective layer may be 45 ° or less.

[0010] The volume resistance of the electrode protective layer of the medium transport belt may be 10 ¹⁰ to 10 ¹⁴ Ω · cm, and the dielectric constant may be 3.0 or more. The contact angle of water on the outermost layer surface of the electrode protection layer of the medium transport belt may be 90 ° or more. The outermost layer surface of the electrode protection layer of the medium transport belt may have a coefficient of static friction of 0.3 or less. The outermost layer surface of the electrode protection layer of the medium transport belt may have a pencil hardness of B or more.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a medium transport belt according to the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, when the medium transport belt of the present invention is a medium transport belt 10, a conductive electrode pattern 14 is formed on the outer peripheral surface of a tubular material 12 made of a polymer material. The outer peripheral surface is protected by an electrode protection layer 16. The electrode protection layer 16 is made of a resin alone, an inorganic material alone, or a composite resin or a composite inorganic material obtained by mixing an additive with a resin or an inorganic material. Here, FIG. 2 is an example of the cross-sectional view of FIG.

Alternatively, as shown in FIG. 3, in the medium transport belt 10 of the present invention, a conductive electrode pattern 14 is formed on the outer peripheral surface of a tubular material 12 made of a polymer material, and the outer peripheral surface is formed of an electrode. The outermost peripheral layer 20 is protected by the protective layer 16, and is further formed on the electrode protective layer 16. The electrode protection layer may be formed of two or more layers. FIG. 3 is an example of the cross-sectional view of FIG.

Here, the polymer material forming the tubular article 12 of the present invention is made of, for example, engineering plastic, and specifically, polyamide 6, polyamide 66,
Polyamide 46, polyamide MXD6, polycarbonate, polyacetal, polyphenylene ether, PET
(Polyethylene terephthalate), PBT (polybutylene terephthalate), PEN (polyethylene naphthalate), polyarylate, liquid crystal polyester, polyphenylene sulfide, polysulfone, polyethersulfone, polyetheretherketone, polyetherimide, polyamideimide, aramid, non-polyamide Thermoplastic polyimide, thermoplastic polyimide, fluororesin, ethylene vinyl alcohol copolymer, polymethylpentene, phenolic resin, unsaturated polyester resin, epoxy resin, silicone, and one selected from materials consisting of diallyl phthalate resin It consists of two or more combinations.

These polymer materials are preferably, for example, materials having a tensile modulus of 2000 MPa or more and / or materials having a glass transition temperature Tg of 150 ° C. or more.
In order to increase the modulus of elasticity and the glass transition temperature, the polymer material may be reinforced with fillers, fibers and the like. Here, the tensile modulus is measured by a method according to ASTM D882, and the glass transition temperature is measured by a method according to JIS K7121.

Among them, the thermoplastic polyimide resin has a glass transition temperature Tg of 150 ° C. or higher, more preferably 23 ° C.
By using a material having a temperature of 0 ° C. or higher,
Depending on the use condition of 0, it functions as a heat-resistant resin.

Here, an example of a thermoplastic polyimide resin used for the medium transport belt of the present invention will be described. The thermoplastic polyimide of the present invention has a chemical structural formula represented by general formula (1)

[0017]

Embedded image

Wherein m and n are equal to each repeating unit mole fraction of the polymer chain, m ranges from about 0.1 to about 0.9, and n ranges from about 0.9 to about 0.1. Wherein the ratio of m to n is from about 0.01 to about 9.0.A and B are both tetravalent organic groups, and X and Y are divalent organic groups. Shown).

A in the general formula (1) is represented by the general formula (2)

[0020]

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(In the formula, R1 and R2 each represent a divalent organic group.) At least one selected from a group of tetravalent organic groups represented by the following formula:

Further, B in the general formula (1) is

[0023]

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At least one selected from the group of tetravalent organic groups represented by

X and Y in the general formula (1) are represented by the general formula (3)

[0026]

Embedded image (In the formula, R3 represents a divalent organic group.), And

[0027]

Embedded image

At least one selected from the group of divalent organic groups represented by

Next, an example of a method for producing a thermoplastic polyimide according to the present invention will be described. The thermoplastic polyimide is prepared by firstly preparing an acid dianhydride having an ester group in the molecular chain represented by the general formula (2) (preferably 10 to 90 mol%) and an aromatic acid dianhydride represented by the general formula (3). An acid dianhydride composed of an anhydride (preferably pyromellitic dianhydride) is reacted with a diamine represented by the above general formula (3) in an organic solvent, and a polyamic acid solution as a polyimide precursor solution is obtained. Get.
The resulting polyamic acid solution is dried by heating and imidized to obtain a polyimide.

The polymer material forming the tubular member 12 may be composed of only the above-mentioned thermoplastic polyimide, or may be composed of a mixture obtained by adding another resin to the thermoplastic polyimide.

An example of the non-thermoplastic polyimide film used for the medium transport belt of the present invention is represented by the following chemical structural formula (4).

[0032]

Embedded image

(Where R4 is a tetravalent organic group;
5 is a hydrogen atom or a monovalent substituent, m and n are integers, and takes a value of m / n = 0.1 to 100. ).

R4 in the general formula (4) is

[0035]

Embedded image

At least one selected from the group of tetravalent organic groups represented by

Here, the non-thermoplastic polyimide can also be represented as a thermosetting polyimide resin or a reaction-curable polyimide resin. The non-thermoplastic polyimide may be composed of a non-thermoplastic polyimide resin alone or a mixture of the non-thermoplastic polyimide and an additive.

The method of forming the tubular material 12 will be described in more detail. The method of forming both ends of a non-thermoplastic polymer material film into a tubular shape by joining with a thermoplastic material, the method of forming a thermoplastic polymer material, A method in which both ends of the film are joined by heating to form a tube, or a non-thermoplastic polymer material film and a thermoplastic polymer material film having substantially equal lengths are laminated by being shifted by a predetermined amount in the longitudinal direction, There is also a method of forming a tubular shape by winding it into a tubular shape and forming it into a tubular shape, followed by heating and joining.

A method of directly forming a non-thermoplastic polymer material or a thermoplastic polymer material into a tubular shape using a mold or the like, or a method of forming a varnish into a uniform coating on a mold, drying,
There is also a cure method. Furthermore, the tubular object 12 is
Predetermined electrode pattern 14 and / or electrode protection layer 1
6 may be obtained by forming a tube after forming it on the surface of the polymer material.

Next, the electrode pattern 14 formed on the outer peripheral surface of the tubular object 12 will be described. As shown in FIG. 4, a predetermined pattern of electrodes 14 is formed on the surface of the tubular object 12, and the electrode patterns 14 are configured such that the ends thereof are alternately extended to apply a voltage. ing. As a method of forming the electrode pattern 14 into a predetermined pattern, a method of screen-printing a conductive paste made of silver, copper, aluminum, carbon, or the like on the surface of the tubular member 12 or the electrode protection layer 16 or a method of forming a conductive paste such as aluminum or copper The metal foil or the metal thin film is applied to the surface of the tubular body 12 and then etched, or a metal such as aluminum is vapor-deposited using a mask having a predetermined pattern.

The electrode pattern 14 is not limited to the illustrated shape. For example, the electrode pattern 14 may be formed in a comb shape, and may be a pattern in which the comb teeth mesh with each other. The thickness of the electrode pattern 14 is
In consideration of the unevenness of the surface due to the above, the thickness is preferably smaller than 10 μm, preferably smaller than 5 μm. The line width and pitch of the electrode pattern 14 can be set arbitrarily.

Next, an electrode protection layer for protecting the tubular object 12 having the electrode pattern 14 formed on the outer peripheral surface will be described. An electrode protection layer 16 is formed on the outer peripheral surface of the tubular object 12 on which the electrode pattern 14 is formed, so that the electrode pattern 14 is protected from external force. The electrode protection layer may be formed with one layer, or may be formed with two or more layers. When the electrode protective layer is composed of one layer, the one layer is the outermost layer. When the electrode protective layer is composed of two or more layers, it is composed of an inner peripheral layer and an outermost peripheral layer. Among the electrode protection layers, a layer other than the outermost layer is also referred to as an electrode protection inner layer in this specification.

The material of the outermost layer of the electrode protective layer or the material of the inner layer of the electrode protective layer of the medium transport belt of the present invention is made of resin (hereinafter referred to as resin A), inorganic material, composite resin or composite inorganic material. Become. A composite resin or a composite inorganic material is a resin in which an additive is mixed with a resin or an inorganic material.Additional additives include an additive that adjusts the water falling property and an additive that adjusts the volume resistivity. Agents,
There are additives for adjusting the dielectric constant.

In particular, the material forming the outer peripheral layer is preferably a composite resin or a composite inorganic material to which an additive for adjusting the falling property of water is added. On the other hand, an additive for adjusting water repellency may be added as a material for forming the electrode protection inner peripheral layer.

The falling angle of the outermost layer of the medium transport belt of the present invention with water is 45 ° or less, preferably 30 ° or less, and more preferably 20 ° or less. When the falling angle of the outermost layer in water is 45 ° or less, the ink transport-based dirt can be rolled off the belt surface by simply giving the medium conveyance belt an inclination, and can be contactlessly contacted. Can also be removed. In addition, when a web is sucked, ink is easily transferred from the belt surface to the web in a belt having a small falling angle, and the ink can be easily removed. Also, when the blade is scraped off, the friction coefficient of the surface of a belt having a small falling angle is small, so that even if the blade is pressed, the surface can be cleaned smoothly. In addition, the surface is less likely to be damaged, and can be maintained for a long period of time without lowering the cleaning level. Also, in cleaning using a cleaning liquid such as water, alcohol, or silicone oil, the cleaning liquid can be easily removed from the belt surface.

On the other hand, when the falling angle of the outermost layer with water is 45 ° or more, it is necessary to remove the dirt on the belt surface using a cleaning device such as a blade or a web. However, dirt cannot be easily removed.

Here, the falling angle of water is one of the indices indicating the chemical state of the material surface, and is determined by measuring as follows. First, about 10 μl of a water droplet is brought into contact with the surface of the evaluation sample. After tilting the sample until the expected falling angle, tilt the sample by about 1 to 2 °, wait for about 10 to 30 seconds, check the movement state of the droplet, and determine the tilt angle of the sample when the movement occurs. The drop angle of the sample.

When the resin A is used as the outermost peripheral layer of the electrode protection layer, the resin A may have a falling angle with water of 4 for example.
5 ° or less, preferably 30 ° or less, more preferably 2 ° or less.
0 ° or less of a thermoplastic resin, a non-thermoplastic resin, a rubber, or a thermoplastic elastomer. Further, the resin A may be a thermosetting resin, a reaction curable resin, or a resin known as an ionomer. Preferably, it is a silicone graft resin such as a silicone graft acrylic resin or a silicone graft fluororesin.

As a method of obtaining a silicone graft resin, a method of copolymerizing a silicone macromonomer with an olefin, fluorine, or acrylic monomer, or a method of reacting a polymer with a silicone oligomer to form a silicone group on a polymer side chain. Examples of the method include introduction.

Here, as a method for introducing a silicone group into the polymer side chain, a reactive group such as an epoxy group, OH, COOH, or NH ₂ is previously left on the polymer, and isocyanate, blocked isocyanate, epoxy, or the like is used. And a method of directly reacting a polymer having a reactive group with a silicone oligomer having a reactive group via an ester bond or an ether bond. Also, radicals are generated in a part of the polymer,
There is also a method of reacting this portion with a silicone oligomer.

The polymer having a reactive group is preferably an acrylic paint or a fluorine-based paint, and more preferably a fluorine-based paint because of its high contact angle. These paints can be spray applied, can be cured at a low temperature of 200 ° C. or less, and do not deteriorate the resin.

The silicone oligomer having a reactive group includes alcohol-modified silicone oligomer,
Examples thereof include amino-modified silicone oligomers, carboxyl-modified silicone oligomers, and epoxy-modified silicone oligomers. Those having a reactive group at the oligomer end are preferable, and silicone oligomers having a reactive group only at one end are more preferable. preferable.

Here, if there is a reactive group at the end of the silicone oligomer, the degree of freedom of movement of the silicone group in the side chain is not restricted even after bonding to the polymer, and the silicone group is easily oriented on the surface. Further, when the silicone oligomer has a reactive group only at one end, the restraint of the silicone group after the reaction is weaker than that of the silicone oligomer having the reactive group at both ends, and the silicone group is present on the surface. It is more preferable because the orientation becomes easy.

Further, these resins are also the resin forming the electrode protection inner peripheral layer of the medium transport belt of the present invention or the resin in the above-mentioned composite resin.

Here, the resin in the resin or the composite resin used for forming the electrode protection inner peripheral layer has a glass transition temperature Tg when the medium transport belt of the present invention is exposed to a high temperature. The temperature is preferably 150 ° C. or higher. It is more preferable to use a polyimide resin or a thermoplastic polyimide resin having a glass transition temperature Tg of 150 ° C. or higher.

In order to prevent a leak current under a high temperature and high humidity condition, maintain a high adsorption force, and prevent a dielectric breakdown when the paper absorbs ink, the water absorption of the resin is preferably lower. Is good. In particular, in order to maintain insulation at a use environment of 30 ° C. and 80% RH, it is preferable to use a resin having a water absorption of 1% or less, more preferably a resin having a water absorption of 0.5% or less. Is good.

Here, the water absorption is a value measured based on JIS K7209. More specifically, the film of the test piece was dried for 24 ± 1 hour in a constant temperature bath maintained at 50 ° C. ± 2 ° C., and the weight of the product cooled in a desiccator was set to W1, and immersed in distilled water for 24 hours. The weight of the surface from which water droplets were wiped off was designated as W2, and the water absorption (%) = (W2-W
1) Calculate by the formula of ÷ W1 × 100. Hereinafter, this measurement and calculation method will be used when referring to the water absorption in the present specification.

In the present invention, when an inorganic material is used as the outermost layer electrode protection layer of the medium transport belt, the inorganic material alone may be a sol-gel reaction,
A hard coat material utilizing a chemical reaction such as an organic reaction can be used. Specifically, the falling angle of water 4
5 ° or less, preferably 30 ° or less, more preferably
20 ° or less, an organosilicon compound, an organic titanium compound, an organic aluminum compound, an organic zirconium compound, an organic boron compound, or a combination of two or more inorganic materials selected from these. Can be mentioned.

These inorganic materials are also used as the inorganic material alone or in the composite inorganic material for forming the electrode protection inner peripheral layer of the medium transport belt in the present invention.

Here, when an additive is added to the inorganic material,
As inorganic additives to be added, ceramic materials such as silica, alumina, zirconia, titania, silicon carbide, silicon nitride, boron nitride, mullite, magnesia, steatite, forsterite, zircon, cordierite, glass and mica, And clay minerals. Further, a mixture of two or more of these may be used.

In order to increase the falling angle on the outermost layer surface of the electrode protection layer, an additive for adjusting the falling angle (hereinafter referred to as additive B) is added to the aforementioned resin A component or inorganic material. Can be.

As a component of the additive B, silicone oil or silicone oligomer is preferable. When an additive is added, it is preferable to use a thermosetting (reaction hardening) resin as the base resin, whereby the oil or oligomer is converted into IPN (interpenetrating polymer network structure) with the resin,
It is possible to prevent oil and oligomers from being detached from the resin during cleaning.

Examples of the silicone oil and silicone oligomer (silicone oil / oligomer) include dimethyl silicone oil / oligomer, methyl hydrogen polysiloxane / oligomer, methylphenyl silicone oil / oligomer, tubular dimethyl polysiloxane /
Oligomers can be mentioned. More preferably, a modified silicone oil or a modified silicone oligomer is preferably used because the affinity with the resin for the electrode protective layer is increased, and the addition has a high effect of improving the falling angle and the slipperiness.

The modification methods include alkyl modification, alkyl aralkyl modification, ether modification, alcohol modification, fluorine modification, amino modification, mercapto modification, carboxyl modification, fatty acid modification, epoxy modification, carbinol modification,
Examples include methacrylic modification and phenolic modification.

The content ratio of these additives B is at least 5 vol%, preferably at least 10 vol%, more preferably at least 15 vol%, based on the volume of all the materials forming the outermost layer.
1% or more. When the solid additive is kneaded with the material, the mixture is uniformly mixed using a hot roll, a single-screw or twin-screw kneader, or the like.

The thickness of the electrode protection layer is not particularly limited. When the electrode protection layer has a two-layer structure of an inner electrode protection layer and an outermost layer, or more, the outermost layer has a thickness of 25 μm or less, preferably 15 μm or less. More preferably 10μ
m or less. When the thickness is 25 μm or more, the running property is deteriorated. In particular, when the volume resistance value of the outer layer is higher than the volume resistance value of the inner layer, the adsorbing force with the medium is extremely reduced. Impairs stability.

In order to adjust the volume resistance of the electrode protection layer, a conductive powder can be added to the resin. Examples of the conductive powder to be used include carbon powder, graphite, metal powder, metal oxide powder, conductively processed metal oxide, an antistatic agent, and the like. At least one or more conductive powders can be used.

The amount of the conductive powder to be added is appropriately determined depending on the volume resistance of the outermost layer of the target electrode protective layer.
50 vol% is preferable, and 3 to 30 vol% is more preferable.

The size of the conductive powder is appropriately selected according to the purpose, but preferably has an average particle diameter of usually 50 μm or less, more preferably has an average particle diameter of 10 μm or less, and has an average particle diameter of 1 μm. The following are more preferred.

In order to adjust the dielectric constant of the outermost layer of the electrode protective layer or the inner layer of the electrode protective layer, a high dielectric constant powder can be used. As the high dielectric constant powder to be used, an inorganic powder having a dielectric constant of 50 or more, specifically, titanium oxide, barium titanate, potassium titanate, lead titanate, lead niobate, zirconate titanate, magnetic powder, etc. Can be mentioned. More preferably, it is good to use an inorganic powder having a dielectric constant of 100 or more, for example, barium titanate,
Examples include lead zirconate titanate, titanium oxide, and magnetic powder.

The shape of the high dielectric constant powder is not particularly limited, but may be, for example, spherical, flake, whisker, or the like. The size of the high dielectric constant powder is not particularly limited. For example, in the case of a spherical shape, the average particle diameter is preferably 50 μm or less, more preferably 10 μm or less, and the average particle diameter is 1 μm. The following are more preferred. In the case of whiskers, the length is 50 μm or less
Those having a diameter of 0.5 to 20 μm can be used.

The amount of the high dielectric constant powder to be added is appropriately set according to the dielectric constant of the outermost layer of the target electrode protective layer, but is usually preferably 5 to 50 vol%, and more preferably 10 to 30 vol.
1% is more preferred.

[0073] Here, the volume resistivity of the electrode protective layer peripheral layer of the present invention is preferably ^{10 9 ~10 1 5 Ω · cm} ,
More preferably, it is 10 ¹⁰ to 10 ¹⁴ Ω · cm, and the dielectric constant is 3.0 or more, and preferably 5.0 or more. When the dielectric constant is 3.0 or more, the adsorbing power of the medium becomes sufficient when a voltage is applied.

When the volume resistance is less than 10 ⁹ Ω · cm, the insulating property between the adjacent electrodes 14 is insufficient, and a leak current flows. When the volume resistance exceeds 10 ¹⁵ Ω · cm, electric charge is less likely to be induced on the surface of the electrode protection layer, so that the attraction force on the surface of the electrode protection layer decreases. Furthermore, even after the voltage applied to the electrode is removed, the residual charge remains for a long time, so that the medium remains adsorbed, which is not preferable. On the other hand, when the dielectric constant is less than 3.0, when a voltage is applied, the electric charge on the surface of the electrode protective layer becomes insufficient, and the adsorbing power of the medium becomes insufficient.

The volume resistance value in the present invention is measured using a SM-10 made by Toa Dempa Kogyo Co., Ltd. after preparing a material resin into a 100 μm film, leaving the film at a temperature of 20 ° C. and a humidity of 60% for 24 hours. It is a value measured at a voltage of 500V. Further, the dielectric constant in the present invention is such that the material resin is 200
It is a value measured at a frequency of 1 kHz by using AS-4245 manufactured by Ando Electric Co., Ltd. after being prepared at a temperature of 20 ° C. and a humidity of 60% for 24 hours. Hereinafter, in this specification, the volume resistance value and the dielectric constant refer to these measured values.

In the present invention, the volume resistance value of the outermost periphery is
Although not particularly limited, when there is an electrode protection inner peripheral layer,
It is preferably equal to or higher than the electrode protection inner peripheral layer. When the volume resistance value of the outermost layer is lower than the volume resistance value of the inner layer of the electrode protection, no current flows through the medium, and it is difficult for electric charge to be induced on the surface of the electrode protection layer. Will be lower.

The contact angle of the outermost layer of the electrode protective layer of the medium transport belt is preferably 90 ° or more. This makes it possible to reduce the contact area between the ink and the outermost layer. Can be reduced. In addition, when the ink is absorbed by the web or the like, the ink quickly moves to the web, thereby increasing the cleaning effect.

Here, the contact angle with water refers to JISR32
57 is a value measured on the basis of a contact angle meter (CA-DT.A type: manufactured by Kyowa Interface Chemical Co., Ltd.), and then a predetermined value is calculated. is there. Hereinafter, in this specification, a contact angle with water refers to this measured value.

The outermost layer of the electrode protection layer preferably has a coefficient of static friction of 0.3 or less. In this case, even when the blade or the web is pressed against the outermost peripheral layer during the scraping with the blade or the wiping with the web, the surface can be smoothly cleaned. In addition, since it is difficult for the electrode protective layer surface to be damaged,
It can be maintained without reducing the level of cleaning. In addition, it can slide smoothly with the cleaning means, does not cause pulsation at the time of transport, and can realize stable traveling.

Here, the static friction coefficient is defined by JIS K712.
5 is a value measured between the medium (paper) and the outermost layer on the basis of No. 5, and hereinafter, the static friction coefficient in this specification refers to this measured value.

Further, the pencil hardness of the outermost layer surface of the electrode protective layer is preferably B or more, preferably HB or more, more preferably H or more. In this case, the coefficient of static friction is reduced, the surface of the electrode protective layer is hardly damaged, and the cleaning level can be maintained for a long time without lowering the cleaning level. Also, even if a sudden impact is applied to the surface of the electrode protective layer during maintenance or mechanical trouble, the surface is hardly scratched and stable cleaning performance,
Runnability and insulation can be maintained.

Here, the pencil hardness is a value measured based on JIS K5400, and is a value when the load is 100 g. Hereinafter, the pencil hardness in this specification refers to this measured value.

The surface roughness Ra of the outermost layer surface of the electrode protection layer is preferably 0.5 μm or less, and more preferably 0.2 μm or less. Thereby, when scraping with a blade or wiping with a web, it is possible to reduce the possibility that ink remains on minute irregularities on the surface.

Here, “surface roughness” refers to JIS B0
601. More specifically,
Using a surface roughness measuring device SE3500 (manufactured by Kosaka Laboratory Co., Ltd.) as a measuring device, the electrode protective layer in the portion where the electrode pattern is formed from the medium transport belt 10 is 30 mm long.
Measure at the portion cut out with a width of 3 mm, draw a chart with a cutoff of 0.8 mm and a feed rate of 0.1 mm / Sec, extract a portion of the reference length L, and set the center line of the extracted portion to the X axis, When the roughness curve is represented by Y = f (X) with the vertical direction as the Y axis, the value obtained by the following equation is represented by? M. ^{Ra = 1 / L∫ L | f} (X) | dx

This measurement is performed three times with the reference length (L) being 2.5 cm, and the average value is shown. Hereinafter, in the present specification, “surface roughness Ra” refers to this measured value.

[0086] The example of the configuration of the medium transport belt according to the present invention has been described above. Next, an example of a method of manufacturing the medium transport belt 10 will be described.

First, a tubular material 12 made of a polymer material serving as a base is formed as a seamless belt by a casting method, and an electrode pattern 14 is formed on the outer surface of the tubular material 12. Further, except for the end portions of the electrode pattern 14 which alternately extend on the outer peripheral surface, the electrode protection layer 1
6 is formed by, for example, a coating method or the like to manufacture the medium transport belt 10.

After forming a film in advance with a polyimide resin, joining both ends of the film to obtain a tubular material 12, forming an electrode pattern 14 and an electrode protection layer 16 in the same manner as described above. Thus, the medium transport belt 10 may be manufactured.

Alternatively, as shown in FIG. 4, after an electrode pattern 14 is formed on the surface of a film 18 formed of a polyimide resin, an electrode protection layer 16 is further formed as shown by a two-dot chain line. The medium transport belt 10 may be manufactured by joining both ends of the film 18.

Further, after the electrode pattern 14 is formed on the surface of the film 18 formed of a polyimide resin, both ends of the film 18 are joined, and then the electrode protection layer 16 is further formed as shown by a two-dot chain line. Thus, the medium transport belt 10 can be manufactured.

In these manufacturing methods, the electrode protection layer 1
The method of forming 6 is such that the resin is made into a varnish form, and the varnish is applied on the electrode pattern 14, or the like, or the electrode protection layer is made into a film form in advance, and the film is formed as one or more layers. There is a method of laminating or winding on the layer and the electrode pattern 14.

Examples of the laminating method or the winding method include, but are not limited to, a thermocompression method using a hot press method or a hot roll method.

Although the medium transport belt according to the present invention has been described above, the above-described embodiment is merely an example, and the present invention is not limited thereto. Further, it is possible to arbitrarily perform various treatments on the surface of the obtained medium transport belt, and the present invention provides various improvements and corrections based on the knowledge of those skilled in the art without departing from the spirit thereof. , Can be implemented in a modified form.

[Examples] (Example 1) A non-thermoplastic polyimide film (Apical 12.5NPI (manufactured by Kaneka Chemical Industry Co., Ltd.)) having a thickness of 12.5 μm is coated on both sides with a thermoplastic polyimide (Pixio TPD: (Kanebuchi Chemical Industry Co., Ltd .: Tg about 150 ° C)
A layer was formed to obtain a bonding film of about 20 μm. After this film was cut into dimensions of 430 mm × 3141 mm, an electrode width of 6 mm, a distance between electrodes of 3 mm, and a thickness of 10 μm were formed on one side of the film using an epoxy-based silver paste.
86 electrode patterns 14 were formed. This film is 250 mm in outer diameter so that the electrode surface is finally outside.
Was wound around the metal cylinder four times. A 20 μm thick PVD is formed on the electrode pattern 14 as an inner peripheral layer of an electrode protection layer.
A film of F (polyvinylidene fluoride) -based resin (Sefuralsoft G150F200: Central Glass Co., Ltd.) is wound around 6 times, and hot pressed at 200 ° C. under 98 N.
/ Cm ² , the thickness of the tubular material is 80 μm,
A tubular article having an inner peripheral layer of the electrode protection layer having a thickness of 120 μm was prepared. Further, a silicone graft acrylic resin (X-22-8095X: Shin-Etsu Chemical Co., Ltd.) was applied by spraying and then dried to form an outermost layer having a thickness of about 10 μm, thereby producing a medium transport belt 10 of the present invention.

The volume resistance of the inner peripheral layer of the electrode protection layer is 3.4.
× 1014Ω · cm, dielectric constant 6.4, water absorption 0.0
4%, the falling angle of water in the outermost layer was 15 °, the contact angle with water was 100 °, the coefficient of static friction was 0.15, and the pencil hardness was B.
Met. Normal temperature and normal humidity (20 ° C, 20%,
The adsorption power was 24.5N.

The paper suction force of the medium transport belt 10 was measured by the method described below. First, a DC voltage of 2 kV was applied between the electrodes of the electrode pattern 14, and A6 size paper 40 was adsorbed to the belt 10 at normal temperature and normal humidity (20 ° C., 20%) as shown in FIG. . Thereafter, the paper 40 was pulled in the direction of the arrow in the figure in parallel with the surface of the belt 10, and the maximum force when the paper 40 was moved was measured as a suction force by a digital force gauge. When the paper has an adsorbing force of 24.5 N or more, it is possible to suppress the paper from sucking up ink and floating (cockling) during printing.

(Example 2) On the outermost layer of the electrode protective layer of the tubular article prepared in Example 1, a fluorine-based paint (Sefural Coat 202B: Central Glass Co., Ltd .: blocked with a hydroxyl- or carboxyl-group-containing fluororesin) 90% of a reactive fluororesin composed of a polyisocyanate curing agent) / 10% of a silicone oligomer (KF6001: Shin-Etsu Chemical Co., Ltd .: having a hydroxyl group at the end and capable of reacting with isocyanate), spray-dried, dried and about 10 μm
Was formed, and the medium transport belt 10 of the present invention was formed.

The falling angle of water in the outermost layer is 15 °, the contact angle with water is 100 °, the coefficient of static friction is 0.15, and the pencil hardness is B.
Met. The NN adsorption force of the medium (paper) was 24.5N.

(Example 3) On the outermost layer of the electrode protective layer of the tubular article prepared in Example 1, a fluorine-based paint (Sefural Coat 202B: Central Glass Co., Ltd .: blocked with a hydroxyl group- or carboxyl group-containing fluororesin) 90% of a reactive fluororesin composed of a polyisocyanate curing agent) / 10% of a silicone oligomer (KF354: Shin-Etsu Chemical Co., Ltd .: no reactive group) is spray-coated and then dried to form an outermost layer of about 10 μm. A medium transport belt 10 of the present invention was prepared.

The falling angle of water in the outermost layer was 30 °, the contact angle with water was 105 °, the coefficient of static friction was 0.21, and the pencil hardness was B.
Met. The NN adsorption force of the medium (paper) was 25.5N.

Comparative Example 1 The medium transport belt 10 was manufactured in the same manner as in Example 1 except that the outermost layer of the electrode protection layer of the tubular article was formed of a fluorine-based paint (Sefural Coat 202B: Central Glass Co., Ltd.). I got

The falling angle of water in the outermost layer was> 60 °, the contact angle with water was 82 °, the coefficient of static friction was 0.35, and the pencil hardness was B.
The sliding angle, the contact angle, and the coefficient of static friction were inferior to those of Examples 1 to 3. On the other hand, the NN adsorption force of the medium (paper) was 30.4 N, which was excellent.

(Evaluation of Cleaning) The evaluation of ink cleaning property of the medium transport belt 10 was performed as follows. Ink jet ink (cyan, magenta, yellow, black) was dropped on the electrode protection layer 16 of the medium transport belt, the electrode protection layer 16 was wiped off with a cloth, and the appearance was observed. The medium transport belts of Examples 1 to 3 were easier to wipe off ink than Comparative Example 1, and were excellent in ink cleaning properties.

[0104]

According to the medium transport belt of the present invention, a conductive electrode pattern is formed on an outer peripheral surface of a molded tubular article made of a polymer material, and an electrode protective layer is formed on the outer peripheral surface. Is formed, and an outermost peripheral layer is further formed as necessary. Of the medium transport belt of the present invention,
Since the falling angle of water in the outermost layer is 45 ° or less, the ink is excellent in ink cleaning properties, and can be conveyed while sufficiently adsorbing a medium such as paper or OHP.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view of an example of a medium transport belt according to the present invention.

FIG. 2 is an enlarged sectional explanatory view of a main part of an example of the medium transport belt shown in FIG.

FIG. 3 is an enlarged sectional explanatory view of a main part showing another mode of the medium transport belt shown in FIG. 1;

FIG. 4 is an explanatory plan view of a main part of an example showing an aspect of an electrode pattern in the medium transport belt shown in FIG. 1;

FIG. 5 is an explanatory plan view of a main part of an example showing an experimental method of the suction force of the medium transport belt according to the present invention.

[Explanation of symbols]

 10: Medium transport belt 12: Tubular object 14: Electrode pattern 16: Electrode protection layer 20: Outermost layer 40: Paper

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[Procedure amendment]

[Submission date] July 3, 2001 (2001.7.3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name]

[Correction method] Change

[Correction contents]

Here, “surface roughness” refers to JIS B0
601. More specifically,
Using a surface roughness measuring device SE3500 (manufactured by Kosaka Laboratory Co., Ltd.) as a measuring device, the electrode protective layer in the portion where the electrode pattern is formed from the medium transport belt 10 is 30 mm long.
Measure at the portion cut out with a width of 3 mm, draw a chart with a cutoff of 0.8 mm and a feed rate of 0.1 mm / Sec, extract a portion of the reference length L, and set the center line of the extracted portion to the X axis, When the roughness curve is represented by Y = f (X) with the vertical direction as the Y axis, the value obtained by the following equation is represented by μm. ^{Ra = 1 / L∫ L | f} (X) | dx

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F049 AA03 BA11 BA12 BA14 BA15 LA07 LB03 3F101 AA03 AB14 AB19 LA07 LB03

Claims (8)

[Claims] 1. A laminated resin belt having at least one electrode protection layer on a resin film having an electrode pattern on its surface, wherein the outermost outer surface of the electrode protection layer has a water falling angle of 45. ° or less, wherein the medium transport belt. 2. A resin laminated belt having at least one electrode protection layer on a resin film having an electrode pattern on a surface, wherein the outermost layer of the electrode protection layer has a side chain made of a silicone group. A medium transport belt comprising a polymer resin composition having the same. 3. The medium transport belt according to claim 2, wherein the polymer resin composition comprises an acrylic resin composition or a fluorine resin composition. 4. The medium transport belt according to claim 2, wherein the outermost layer of the electrode protection layer has a water falling angle of 45 ° or less. 5. The volume resistance of the electrode protection layer is 10 ¹⁰
A ~10 ¹⁴ Ω · cm, and wherein the dielectric constant of 3.0 or more, the medium conveying belt according to any one of claims 1 to 4. 6. The medium transport belt according to claim 1, wherein a contact angle of the outermost layer surface of the electrode protection layer with water is 90 ° or more. 7. The medium transport belt according to claim 1, wherein the coefficient of static friction of the outermost layer surface of the electrode protection layer is 0.3 or less. 8. The medium transport belt according to claim 1, wherein the outermost layer surface of the electrode protection layer has a pencil hardness of B or more.