JP2000272771A - Medium carrying belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the meandering while keeping the medium attracting force of a carrying belt by forming an electrode pattern on the outer circumferential surface of a tubular matter made of a polymer material, forming an electrode protecting layer having volume natural resistance and dielectric constant of specified values, respectively, on the electrode pattern, and suppressing the circumferential length difference of the carrying belt to a specified value. SOLUTION: A medium carrying belt 10 has a conductive electrode pattern 14 formed on the surface of a tubular matter 12 consisting of a polymer material and an electrode protecting layer 16 formed on the electrode pattern 14. The electrode protecting layer 16 is formed so as to have a volume natural resistance of 109-1015 Ω.cm and a dielectric constant of 3.0 to 30.0. The medium carrying belt 10 is formed so that the circumferential length difference is 1.0 mm or less, and the circumferential difference between both ends of the medium carrying belt 10 is 0.5 mm or less. Examples of sable polymer material include non- thermoplastic polyimide, thermoplastic polyimide, polyether sulfone, polyethylene terephthalate, polyether etherketone and the like.

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 a belt used for transporting paper or OHP film used in an electrophotographic apparatus such as a copying machine, a laser beam printer or a facsimile, or an ink jet printer. Alternatively, the present invention relates to a belt used for conveying or drying paper or an OHP film of a bubble jet printer.

[0002]

2. Description of the Related Art In an electrophotographic apparatus such as a copying machine, for example, paper is conveyed by placing the paper on a resin belt such as PC or vinylidene fluoride or by pre-charging the resin belt to impart a charge to the surface. In addition, a method is known in which paper is adsorbed and transported by the charge.

[0003]

In the method of transporting a paper placed on a resin belt, the paper and the belt often slip, and it is difficult to realize a stable transport. on the other hand,
In the method of adsorbing paper by charging the resin belt, the adsorbing power of the paper is insufficient, the paper cannot be accurately fixed on the belt, and the leading end of the paper rises during the conveyance. , There was a problem. In particular, in order to increase the speed of the printer, paper or O.D.
It is necessary to accurately adsorb a printing medium such as an HP film to a belt and to increase the adsorbing power. Further, even if the use environment changes, for example, even under high temperature and high humidity,
It was necessary to secure a sufficient paper suction force.

In the case of an ink jet printer or a bubble jet printer, it is necessary to dry ink at the same time as paper is conveyed. For this reason, the transport belt needs to have heat resistance, but in order to shorten the drying time, it is necessary to further improve the heat resistance in response to the high temperature. Moreover, the transport belt does not deteriorate due to the components of the ink, and the paper absorbs the water with the ink.
It was necessary to prevent dielectric breakdown. Furthermore, it is necessary that the surface of the ink does not deteriorate due to the adhesion of the ink to the belt surface. In many cases, since the ink is alkaline, it is necessary that the surface of the belt does not deteriorate against alkali.

The present inventors can strongly absorb a medium for printing or the like in order to achieve a higher speed of a printer or the like.
A medium transport belt having withstand voltage and ink resistance was obtained. That is, the electrode pattern is formed on the belt, the paper is electrostatically attracted by applying a voltage, and by specifying the configuration and material characteristics of the belt, the paper transportability and heat resistance, withstand voltage, withstand voltage, A medium transport belt having excellent ink properties was proposed (Japanese Patent Application Nos. 10-234001 and 10-234001).
-317469).

In the case of using these medium transport belts, the belt is usually driven and run while being suspended under tension by a roller support. In order to prevent the belt from meandering during traveling, a meandering correction function is generally added to the drive system. However, there is a problem that a predetermined meandering correction cannot be performed if the circumferential difference of the belt is too large.

The inventors of the present invention have conducted intensive studies in order to reduce meandering during belt running while maintaining the medium attracting force of the conventional medium transport belt, and as a result, have determined the difference in circumferential length in the width direction of the belt. They have found that it is better to be less than or equal to the value, and have arrived at the medium transport belt according to the present invention.

[0008]

SUMMARY OF THE INVENTION The gist of the medium transport belt according to the present invention is that a conductive electrode pattern is formed on the outer peripheral surface of a tubular article formed of a polymer material. The volume resistivity is 10 ⁹ to 10 ¹⁵ Ω · cm and the dielectric constant is 3.0 or more 3 on the electrode pattern.
A medium transport belt on which an electrode protection layer of 0.0 or less is formed, wherein a difference in circumference of the medium transport belt is 1.0 mm or less.

[0009] In such a medium transport belt, the circumferential difference between both ends of the medium transport belt may be 0.5 mm or less.

[0010] In such a medium transport belt, the above-mentioned polymer material is made of non-thermoplastic polyimide, thermoplastic polyimide, polyethersulfone, polyethylene terephthalate, polyetheretherketone, polyphenylenesulfide, polyetherimide, polysulfone, polyamideimide, polyimidimide. It can be one or more materials selected from the group consisting of ether imides, polyarylates, and polycarbonates.

In the medium transport belt, the electrode protective layer may be a resin alone or a composite resin obtained by mixing an additive with a resin.

In the medium transport belt, the additive may be a conductive powder, a high dielectric constant powder, or a combination thereof.

In the medium transport belt, the resin may be a resin having a water absorption of 1% or less.

In the medium transport belt, the resin is -CH ₂ -CR ₁ R _2- (where R ₁ or R ₂
Represents H, CH ₃ , Ph or COOX, and X is an organic group), an olefin resin, a styrene resin or an acrylic resin, or —CH ₂ —C
It may be an olefin resin having a structure of R ₁ R ₂ —, a styrene resin, or a resin containing 30 vol% or more of an acrylic resin.

[0015] In this medium transport belt, the resin, -CF ₂ -CFR ₃ - (wherein R ₃ is, H, Cl or _{F), - CH 2 -CF 2} - or -CH ₂
Fluorinated resin having a structure of —CHF— or —CF ₂
—CFR ₃ — (where R ₃ is H, Cl or F), —CH ₂ —CF ₂ — or —CH ₂ —CHF—
May be a resin containing a fluororesin having a structure of 30 vol% or more.

In such a medium transport belt, an outer peripheral layer made of a resin having a water absorption of 1% or less can be formed on the outer peripheral surface of the electrode protective layer.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The term "peripheral difference of a medium transport belt" in the present invention refers to the difference between the longest and the shortest peripheral lengths parallel to the belt rotation direction on the inner peripheral surface of the medium transport belt. It refers to the difference. For example, when the end portion of the belt is slacker than the center portion, a difference in the circumferential length parallel to the rotation direction between the end portion and the center portion, that is, a difference in the circumferential length of the medium transport belt occurs.

Next, 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 FIG. 1 and FIG. 2, a medium transport belt 10 according to the present invention comprises a conductive electrode pattern 1 on an outer peripheral surface of a tubular material 12 formed of a polymer material.
4 and an electrode protection layer 16 is formed on the electrode pattern 14. The electrode protective layer 16 has a volume resistivity of 10 ⁹ to 10 ¹⁵ Ω · cm and a dielectric constant of 3.0 or more and 30.0 or less.

The polymer material forming the tubular material 12 of the present invention is, for example, an 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-heat Plastic polyimide, thermoplastic polyimide, fluorine resin, ethylene vinyl alcohol copolymer, polymethylpentene, phenol resin, unsaturated polyester resin , 1 selected from the group consisting of epoxy resin, silicone, and diallyl phthalate resin
Types or combinations of two or more types are preferred. Among them, particularly preferably, but not limited to, non-thermoplastic polyimide, thermoplastic polyimide, polyethersulfone, polyethylene terephthalate, polyetheretherketone, polyphenylenesulfide, polyetherimide, polysulfone, polyamideimide, polyetherimide, It is characterized by being at least one material selected from the group consisting of polyarylate and polycarbonate.

Among them, a thermoplastic polyimide resin having a glass transition temperature Tg of 150 ° C. or higher, more preferably 230 ° C. or higher can be used. The medium transport belt 10 is a belt used for transporting paper or OHP film in an electrophotographic apparatus such as a copier, a laser beam printer, or a facsimile, or transporting paper or an OHP film in an inkjet printer apparatus or a bubble jet printer apparatus. A belt used for drying and the like. Therefore, under the use conditions of the belt, the thermoplastic polyimide resin constituting the medium transport belt 10 has a glass transition temperature Tg of 150 ° C. or more, more preferably 230 ° C. or more, so that the heat used at the glass transition temperature Tg or less is obtained. The plastic polyimide resin functions as a heat-resistant resin.

Next, an example of the thermoplastic polyimide resin used for the medium transport belt of the present invention will be described. The thermoplastic polyimide film, unlike a conventional non-thermoplastic (thermosetting) polyimide film, has melt flowability in a predetermined high temperature range while having heat resistance, and is excellent in workability. Also,
The adhesiveness of the joint portion in the heat resistant resin belt of the present invention is excellent as compared with a non-thermoplastic polyimide film. The thermoplastic polyimide according to the present invention has a chemical structural formula represented by the general formula (1)

[0023]

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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. It is preferable that the structure represented by the following formula) is a main component.
Further, as an acid dianhydride, A in the general formula (1) which is a monomer imparting thermoplasticity is represented by the general formula (2)

[0025]

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(In the formula, R ₁ and R ₂ each represent a divalent organic group.) It is preferable that at least one selected from the group of tetravalent organic groups represented by the following formula: Further, B in the general formula (1) is

[0027]

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It is preferable that at least one selected from the group of tetravalent organic groups represented by Further, as the diamine, X and Y in the general formula (1) are monomers that impart thermoplasticity.

[0029]

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(In the formula, R ₃ represents a divalent organic group.)
And 5

[0031]

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It is preferable that at least one selected from the group of divalent organic groups represented by

Here, an example of a method for producing a thermoplastic polyimide applicable to the heat-resistant resin belt of the present invention will be described. The thermoplastic polyimide is first prepared from an acid dianhydride having an ester group in the molecular chain represented by the general formula (2) (preferably 10
-90 mol%) and an aromatic dianhydride (preferably pyromellitic dianhydride) represented by the above formula (3), and a diamine represented by the above formula (3) Are reacted in an organic solvent to obtain a polyamic acid solution which is a polyimide precursor solution. Then, by further heating and drying to imidize, polyimide is obtained. However, this embodiment is an exemplification and is not limited to this.

As the film of the polymer material used for the medium transport belt, for example, a film made of only the above-mentioned thermoplastic polyimide may be used, but a film obtained by mixing a mixture obtained by adding another resin to the thermoplastic polyimide is used. May be used.

The non-thermoplastic polyimide film used for the medium transport belt of the present invention is represented by the following general formula (4).

[0036]

Embedded image

(However, R ₄ is

[0038]

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Wherein R ₅ is a hydrogen atom or a monovalent substituent, m and n are integers,
m / n = 0.1 to 100. ) Can be used, but the film is not limited to this.

In the non-thermoplastic polyimide film,
It includes all resins represented as thermosetting polyimide resins or reaction-curing polyimide resins. As the non-thermoplastic polyimide film, for example, a film made of only a non-thermoplastic polyimide resin may be used, or a film made of a non-thermoplastic polyimide film mixed with an additive may be used. To mix additives into the non-thermoplastic polyimide film, the precursor is mixed with the additives.

The method of forming the tubular material 12 will be described more specifically. A method of joining both ends of a non-thermoplastic polymer material film with a thermoplastic material to form a tubular material, a method of forming a thermoplastic polymer material film, and the like. A method of forming a tube by heating and joining both ends of the tube, or laminating a non-thermoplastic polymer material film and a thermoplastic polymer material film by displacing the positions of their butt ends and forming a tube. Alternatively, a method of forming a tube by heating and joining can be used. Furthermore, a method of directly molding a non-thermoplastic polymer material or a thermoplastic polymer material into a tubular shape by a mold or the like, a method of applying a resin to a predetermined mold in a varnish shape, and the like can be used. Tubular object 1
2 may be molded, and there is no particular limitation.

When it is sufficient for the tubular member 12 to function only as a support for the electrode pattern 14, the tubular member 12 may have any characteristics as long as it has a predetermined mechanical strength. Typically, the tubular material 12 has a tensile modulus of 200 k.
g / cm ² or more and / or a glass transition temperature of 150
It is composed of a polymer material having a temperature of at least ℃. At this time, 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.

Further, the medium transport belt 10 of the present invention can be obtained by forming a tube of a laminated film obtained by forming an electrode pattern 14 and an electrode protective layer 16 thereon on the surface of a film made of a polymer material. .

Electrodes 14 having a predetermined pattern are formed on the surface of the tubular object 12, and the ends of the electrode pattern 14 are alternately extended so that a voltage can be applied. The electrode pattern 14 is formed by applying a conductive paste made of silver, copper, aluminum, carbon, or the like to the tubular object 10.
Alternatively, screen printing is performed on the surface of the electrode protection layer 16, or a metal foil or metal thin film such as aluminum or copper is applied to the surface of the tubular body 12, and then etched to form a predetermined pattern, or A predetermined pattern is formed by depositing a metal such as aluminum through a mask on which a predetermined pattern is formed. The electrode pattern 14 is not limited to the illustrated shape. For example, the electrode pattern 14 is formed in a comb shape.
A pattern in which the comb teeth mesh with each other can be obtained.

The thickness of the electrode pattern 14 is the same as that of the electrode pattern 1.
Taking into account the surface irregularities due to 4, the thickness is preferably 2 to 30 μm, and more preferably 5 to 20 μm. Further, the electrode pattern 14
The line width and the pitch are arbitrary and can be variously set.

Further, an electrode protection layer 16 is formed on the outer peripheral surface of the tubular article 12 on which the electrode pattern 14 is formed, so that the electrode pattern 14 is protected from external force.

The electrode protection layer 16 has a volume resistivity of 1
0 ⁹ to 10 ¹⁵ Ω · cm and a dielectric constant of 3.0 or more 3
It is a resin simple substance or a composite resin of 0.0 or less. Here, the composite resin refers to a resin obtained by mixing a conductive additive and / or a high dielectric constant additive into a single resin.

The resin used for the electrode protection layer 16 includes a thermoplastic resin, a non-thermoplastic resin, a rubber, and a thermoplastic elastomer. These include thermosetting resins, reaction-curing resins, and resins known as ionomers. More specifically, isobutylene maleic anhydride copolymer, AAS (acrylonitrile-acryl-styrene copolymer), AES (acrylonitrile-ethylene-styrene copolymer), AS (acrylonitrile-styrene copolymer), ABS (acrylonitrile-styrene copolymer) Butadiene-styrene copolymer), ACS
(Acrylonitrile-chlorinated polyethylene-styrene copolymer), MBS (methyl methacrylate-butadiene-styrene copolymer), ethylene-vinyl chloride copolymer, EV
A (ethylene-vinyl acetate copolymer), EVA-based (ethylene-vinyl acetate copolymer), EVOH (ethylene-vinyl alcohol copolymer), polyvinyl acetate, chlorinated vinyl chloride, chlorinated polyethylene, chlorinated polypropylene, Carboxyvinyl polymer, ketone resin, norbornene resin, vinyl propionate, PE (polyethylene), PP (polypropylene), TPX, polybutadiene, PS (polystyrene), styrene maleic anhydride copolymer, methacryl, EMAA (ethylene methacrylic acid), PMMA (polymethyl methacrylate), PVC
(Polyvinyl chloride), polyvinylidene chloride, PVA
(Polyvinyl alcohol), polyvinyl ether, polyvinyl butyral, polyvinyl formal, cellulosic, nylon 6, nylon 6 copolymer, nylon 66,
Nylon 610, nylon 612, nylon 11, nylon 12, copolymer nylon, nylon MXD, nylon 46, methoxymethylated nylon, aramid, PET
(Polyethylene terephthalate), PBT (polybutylene terephthalate), PC (polycarbonate), PO
M (polyacetal), polyethylene oxide, PPE
(Polyphenylene ether), modified PPE (polyphenylene ether), PEEK (polyether ether ketone), PES (polyether sulfone), PSO (polysulfone), polyamine sulfone, PPS (polyphenylene sulfide), PAR (polyarylate), poly Paravinylphenol, polyparamethylenestyrene, polyallylamine, aromatic polyester, liquid crystal polymer, PTFE (polytetrafluoroethylene), ETFE (tetrafluoroethylene-ethylene), FEP (tetrafluoroethylene-hexafluoropropylene), EPE (tetra Fluoroethylene-hexafluoropropylene-perfluoroal, kill vinyl ether), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether) ), PCTFE (polychlorotrifluoroethylene), ECTFE (ethylene-chlorotrifluoroethylene), PVDF (polyvinylidene fluoride), PVF (polyvinyl fluoride), PU (polyurethane), phenolic resin, urea resin, melamine-based Resin, guanamine resin, vinyl ester resin, unsaturated polyester, oligoester acrylate, diallyl phthalate, DKF resin, xylene resin, epoxy resin, furan resin, PI (polyimide), PEI (polyetherimide), PAI (polyamideimide) , Acrylic silicone, silicone, poly (p-hydroxybenzoic acid), maleic resin, NR
(Natural rubber), IR (isoprene rubber), SBR (styrene butadiene rubber), BR (butadiene rubber), CR
(Chloroprene rubber), IIR (isobutylene / isoprene rubber), NBR (nitrile butadiene rubber), EP
M (ethylene propylene rubber), EPDM (ethylene propylene diene rubber), CPE (chlorinated polyethylene rubber), CSM (chlorosulfonated polyethylene rubber), ACM (acrylic rubber), ethylene acrylic rubber, U (urethane rubber), silicone rubber , Fluoro rubber, tetrafluoroethylene propylene rubber, CHR (epichlorohydrin rubber), polysulfide rubber, hydrogenated nitrile rubber, special polyether rubber, liquid rubber, norbornene rubber, TPO (olefin thermoplastic elastomer), T
PU (urethane-based thermoplastic elastomer), PVC (PVC-based thermoplastic elastomer), TPS (styrene-based thermoplastic elastomer), TREE (polyester-based thermoplastic elastomer), PA-based (polyamide elastomer), PB-based (butadiene elastomer), Examples thereof include a soft fluorine resin, a fluorine-based elastomer, an elastic epoxy resin, and the like, or a combination of two or more resins selected from these.

Of these, the medium transport belt 1 of the present invention
0 is exposed to a high temperature, the resin forming the electrode protection layer 16 is a thermoplastic resin having a melting temperature of 150 ° C. or more;
It is preferably rubber or a thermoplastic elastomer.

In order to prevent leakage current under high temperature and high humidity, maintain high adsorption force under high temperature and high humidity, and to prevent dielectric breakdown when paper absorbs ink, The lower the water absorption of the resin forming the electrode protection layer 16, the better. In particular, when an adsorbing force at a use environment of 30 ° C. and 80% RH is required, it is preferable to use a resin having a water absorption of 1% or less, more preferably 0.5% or less. 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 thermostat kept at 50 ° C. ± 2 ° C., and the weight of the product cooled in a desiccator was set to W ₁ and immersed in distilled water for 24 hours. The weight of the surface after wiping off water droplets is defined as W ₂ , and the water absorption (%) = (W ₂ −
W ₁ ) ÷ Calculated by the formula of W ₁ × 100. In this specification, this measurement and calculation method is used when referring to the water absorption.

When a resin having a water absorption of 1% or less is used for the electrode protective layer, it is preferable because the medium transport belt 10 is provided with a suction force and a dielectric breakdown resistance under high temperature and high humidity. Further, when it is desired to impart ink resistance to the belt surface, the electrode protective layer is made of a single resin of the ink-resistant resin or a composite resin obtained by mixing a conductive additive and / or a high dielectric constant additive with the ink-resistant resin. It is preferred that Alternatively, an outer peripheral layer is further provided around the electrode protective layer, and the outer peripheral layer is formed of a single resin of the ink-resistant resin or a composite resin obtained by mixing a conductive additive and / or a high dielectric constant additive with the ink-resistant resin. be able to.

Here, the ink-resistant resin is not limited, but may be selected from fluorine resin, olefin resin, styrene resin, acrylic resin, silicone resin, polyacetal resin, and aromatic resin. At least one kind of resin or these resins
ol% or more.

Specific examples of such an ink-resistant resin include PTFE (polytetrafluoroethylene), ETF
E (tetrafluoroethylene-ethylene), FEP (tetrafluoroethylene-hexafluoropropylene),
EPE (tetrafluoroethylene-hexafluoropropylene-perfluoroal, kill vinyl ether), P
FA (tetrafluoroethylene-perfluoroalkyl vinyl ether), PCTFE (polychlorotrifluoroethylene), ECTFE (ethylene-chlorotrifluoroethylene), PVDF (polyvinylidene fluoride), PVF (polyvinyl fluoride), vinylidene fluoride -Hexafluoropropylene rubber, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene rubber, vinylidene fluoride-pentafluoropropylene rubber, vinylidene fluoride-pentafluoropropylene-tetrafluoroethylene rubber, vinylidene fluoride-par Fluoromethyl vinyl ether-tetrafluoroethylene rubber, vinylidene fluoride-chlorotrifluoroethylene rubber, fluorine Beam (typically, DAI-EL T-5
30, Daiel T-630 (Daikin Chemical Industry Co., Ltd.)
Thermoplastic fluororubber), soft fluororesins (typically, Cefralsoft G150F100N, Cefralsoft G150F200, etc.), fluorine elastomer, isobutylene maleic anhydride copolymer, AAS (acrylonitrile-acryl-styrene copolymer), AES (acrylonitrile) -Ethylene-styrene copolymer), AS
(Acrylonitrile-styrene copolymer), ABS (acrylonitrile-butadiene-styrene copolymer), A
CS (acrylonitrile-chlorinated polyethylene-styrene copolymer), MBS (methyl methacrylate-butadiene-styrene copolymer), ethylene-vinyl chloride copolymer,
EVA (ethylene-vinyl acetate copolymer), EVA-based (ethylene-vinyl acetate copolymer), EVOH (ethylene-vinyl alcohol copolymer), chlorinated vinyl chloride, chlorinated polyethylene, chlorinated polypropylene, carboxyvinyl polymer, Norbornene resin, PE (polyethylene), PP (polypropylene), TPX, polybutadiene, PS (polystyrene), styrene maleic anhydride copolymer, methacryl, EMAA (ethylene methacrylic acid), PMMA (polymethyl methacrylate), polyvinyl ether, polyvinyl Butyral, polyvinyl formal, NR (natural rubber), IR (isoprene rubber), SBR (styrene butadiene rubber), BR (butadiene rubber), CR (chloroprene rubber), IIR (isobutylene / isoprene) Arm), NBR (nitrile butadiene rubber), EPM (ethylene propylene rubber), E
PDM (ethylene propylene diene rubber), CPE (chlorinated polyethylene rubber), CSM (chlorosulfonated polyethylene rubber), ACM (acrylic rubber), ethylene acrylic rubber, norbornene rubber, TPO (olefin-based thermoplastic elastomer), TPS (styrene) Thermoplastic elastomer), PB (butadiene elastomer), P
VC (polyvinyl chloride), PVC (PVC thermoplastic elastomer), silicone rubber, acrylic silicone, P
OM, PEEK, PEK, PPE, PPS, PSF, P
It may be at least one or a combination of two or more selected from ES, PBT, PET, PEN, PC, PAR, and liquid crystal polyester.

Among such ink-resistant resins, a resin having a specific structure can be preferably used. Specifically, -CH ₂ -CF ₂ - or a fluorine-based resin having a structure of _{-CH 2 -CHF-; -CH 2 -CCl 2} - polyvinylidene chloride having a structure of the resin; -CH ₂ -CHC
a polyvinyl chloride resin having a 1- structure; and -CH
_2- CR ₁ R _2- (R ₁ is H, CH ₃ , Ph, COO
X and R ₂ are H, CH ₃ , Ph, COOX, and X is an organic group. Examples include, but are not limited to, olefin-based resins, styrene-based resins, and acrylic resins having the structure of (1).

In order to simultaneously secure the adsorptive power of the medium and the alkali resistance, the resin forming the electrode protective layer is made of -CH ₂
It is preferable to include a vinylidene fluoride resin having a structure of —CF ₂ —.

In the present invention, the term “vinylidene fluoride resin” having the above structure refers to a polymer consisting of a vinylidene fluoride monomer or a copolymer of a vinylidene fluoride monomer and another monomer, At least 10 mol% or more, preferably 20
Refers to a polymer containing at least mol%. More preferably, the resin forming the electrode protection layer is vinylidene fluoride resin of 3
It is a polymer alloy containing 0% by weight or more. Here, examples of the vinylidene fluoride resin include polyvinylidene fluoride resin, vinyldenfluoride-hexafluoropropylene rubber, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene rubber, and vinylidene fluoride-pentafluoropropylene rubber. Rubber, vinylidene fluoride-pentafluoropropylene-tetrafluoroethylene rubber, vinylidene fluoride-perfluoromethylvinyl ether-tetrafluoroethylene rubber, vinylidene fluoride-chlorotrifluoroethylene rubber, thermoplastic fluorine rubber (Diel T -530, Daiel T-630 (manufactured by Daikin Chemical Industry Co., Ltd.), and other soft fluororesins (Cefralsoft G150F100N, Cefralsoft manufactured by Central Chemical Industry Co., Ltd.) 150F200), and at least one resin selected from these according to the purpose is used. Another resin combined with vinylidene fluoride resin to form a polymer alloy is a urethane resin , Vinyl chloride resin, polyethylene resin and the like, but any resin known to those skilled in the art can be used and is not particularly limited.

The volume specific resistance of the electrode protection layer 16 is 10 ⁹ to
10 ¹⁵ Ω · cm, preferably 10 ¹⁰ to 10 ¹⁴ Ω · cm
cm is good, and the dielectric constant is 3.0 or more and 30.0 or less, preferably 5.0 or more. Volume resistivity is 10
If the resistance is less than ⁹ Ω · cm, insulation between the adjacent electrodes 14 is insufficient, and a leak current flows. On the other hand, when the volume resistivity exceeds 10 ¹⁵ Ω · cm, electric charges are less likely to be induced on the surface of the electrode protection layer 16 and the attraction force is reduced. Further, even after the voltage applied to the electrodes is removed, the residual charge remains for a long time, and the paper remains adsorbed, which is not preferable. On the other hand, if the dielectric constant is less than 3.0, the electric charge on the belt surface becomes insufficient when a voltage is applied, and the adsorbing power of the paper becomes insufficient. In order to adjust the electrode protective layer 16 to have the above-mentioned predetermined volume resistivity and dielectric constant, it is preferable to appropriately mix a conductive powder and / or a high dielectric constant powder with a resin constituting the electrode protective layer. .

The conductive powder used for adjusting the volume resistivity of the electrode protection layer 16 includes carbon powder, graphite, metal powder, metal oxide powder, conductive-treated metal oxide, antistatic And at least one or more conductive powders selected from these depending on the purpose. The amount of the conductive powder to be added is appropriately set depending on the intended volume resistivity of the electrode protection layer 16, and is usually preferably 2 to 50 vol%, and more preferably 3 to 30 v%, based on the total volume of the electrode protection layer.
ol% is more preferred. 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 or less. Is more preferred.

The high dielectric constant powder used for adjusting the dielectric constant of the electrode protection layer 16 has a dielectric constant of 50%.
The above inorganic powders are used, and examples thereof include titanium oxide, barium titanate, potassium titanate, lead titanate, lead niobate, zirconate titanate, and magnetic powder. More preferably, an inorganic powder having a dielectric constant of 100 or more is used, and examples thereof include barium titanate, 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, and at least one or more high dielectric constant powders selected from these according to the purpose are used. 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 more preferable. Is more preferably 1 μm or less.
In the case of a whisker, the length is 50 μm or less and the diameter is 0.
Those having a size of 5 to 20 μm can be used. Further, the amount of the high dielectric constant powder to be added is appropriately set depending on the desired dielectric constant of the electrode protection layer 16, and is usually 5 to 50 vol%.
Is preferable, and 10 to 30 vol% is more preferable.

[0060] The medium transport belt of the present invention has a circumferential length difference of 1.0 mm or less. More preferably, the circumference difference is 0.5
mm or less, and more preferably, the circumference difference is 0.5 m.
m or less, and the difference between the circumferential lengths at both ends of the belt is 0.
5 mm or less.

Next, an example of a method for manufacturing the medium transport belt 10 will be described. However, the method for manufacturing the medium transport belt of the present invention is not limited to the following example. 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, an electrode protection layer 16 is formed by, for example, a coating method, except for the end portions of the electrode patterns 14 that alternately extend on the outer peripheral surface thereof.
The medium transport belt 10 is manufactured.

Further, after a film is formed in advance from a polymer material, both ends of the film are joined to form a belt to obtain a tubular material 12, and the electrode pattern 14 is formed in the same manner as described above.
And the electrode protection layer 16 may be formed to manufacture the medium transport belt 10. Alternatively, after the electrode pattern 14 is formed on the surface of the polymer material film 18, the electrode protection layer 1 is further formed.
After forming the film 6, the medium transport belt 10 may be manufactured by joining both ends of the film 18 to form a belt. Further, after forming the electrode pattern 14 on the surface of the polymer material film 18, both ends of the film 18 are joined to form a belt, and then the electrode protection layer 16 is further formed to manufacture the medium transport belt 10. Can also.

The electrode protective layer 16 is formed by coating a raw material resin in a varnish form and applying the varnish on the electrode pattern 14 or by forming the raw material resin of the electrode protective layer in a film form in advance, To electrode pattern 14
It can be formed by laminating on top. In this case, the resin for the electrode protection layer previously formed into a film is
The electrode protection layer can be formed by winding the wire twice.
It is also possible to form an electrode protection layer having a high withstand voltage by winding it more than once. In this case, the thickness of the film is 5 μm
The thickness is set to about 50 μm, and the thickness of the electrode protective layer can be adjusted by the thickness and the number of turns of the film.
Examples of the laminating method include, but are not limited to, a thermocompression method using a hot press method or a hot roll method.

The method for manufacturing the medium transport belt of the present invention can be appropriately selected according to the purpose of the obtained medium transport belt, and is appropriately selected according to the material of the tubular object 12. Further, the manufacturing method can be appropriately set in accordance with the structure of another medium transport belt described below.

In addition to the structure shown in FIG. 1, the structure of the medium transport belt is, for example, as shown in FIG. 4, on the electrode pattern 14 and the electrode protection layer 16 laminated on the outer peripheral surface of the tubular material 12, and further on the electrode protection layer. An outer peripheral layer 20 for protecting 16 may be formed. As the outer peripheral layer 20, for example, any of resins that can be a material of the electrode protection layer 16 can be used. Among these resins, a resin having a water absorption of 1% or less, more preferably a resin having ink resistance can be used. Here, the resin having a water absorption of 1% or less or ink resistance is:
This is the same as the resin used as the material of the electrode protection layer 16. Further, as shown by a two-dot line in the figure, a resin layer can be formed on the inner peripheral surface of the tubular object 12. By forming a resin layer 22 of the same material and substantially the same thickness as the outer peripheral layer 20 on the inner peripheral surface of the tubular object 12, the obtained medium transport belt 24 can be prevented from warping. In this case, the circumference difference is determined based on the innermost circumference of the inner circumference layer.

As shown in FIG. 5, in the medium transport belt 10 in which the electrode pattern 14 and the electrode protection layer 16 are laminated on the outer peripheral surface of the tubular object 12, the electrode protective layer 16 is disposed on the inner peripheral surface side of the tubular object 12. It is also preferable to form the medium transport belt 28 by providing a resin layer 26 made of the same material as that of the above with substantially the same thickness. By making the cross-sectional structure substantially symmetrical except for the electrode pattern 14, it is possible to prevent the medium transport belt 28 from warping.

Further, as shown in FIG. 6, an electrode pattern 14 and an electrode protection layer 16 are laminated on the outer peripheral surface of the tubular object 12, and the electrode protective layer 16 is provided on the inner peripheral surface side of the tubular object 12.
In the medium transport belt 10 provided with the resin layer 26 made of the same material as
The medium transport belt 30 may be formed by forming an outer peripheral layer 20 for protecting the electrode protective layer 16 on the surface of the medium transport belt 30. In this case, the material of the outer peripheral layer 20 does not need to be the same as that of the resin layer 26 on the inner peripheral surface side. Further, it is preferable to provide a resin layer 32 made of the same material as that of the outer peripheral layer 20 with substantially the same thickness on the inner surface of the resin layer 26 on the inner peripheral surface side of the medium transport belt 30.

While the medium transport belt according to the present invention has been described above, the above-described embodiment is merely an example, and it is needless to say that the present invention is not limited to this. In addition, it is possible to arbitrarily perform various treatments on the surface of the obtained medium transport belt, and the present invention can be variously improved, modified, and modified based on the knowledge of those skilled in the art without departing from the gist of the present invention.
It may be implemented in a modified manner.

[0069]

EXAMPLE 1 A non-thermoplastic polyimide film having a thickness of 100 μm and an epoxy-based silver paste were used. As shown in FIGS. 1 and 2, the electrode width was 6 mm and the distance between the electrodes was 3 m.
An electrode pattern 14 having a thickness of 10 μm and a thickness of 10 μm was formed. The film having a width of 430 mm on which the electrode pattern 14 was formed was wound in a state in which the film was in close contact with a metal circular tube having an outer diameter of 250 mm, and the abutting portions were attached to form a belt. Thereafter, the circumference of the inner circumference of the belt was measured using a laser type dimension measuring machine having a diameter of 250 mm. As a result, the difference in circumference between the end, the center, and the other end of the belt was 0.5 m.
m. Thereafter, Sefralsoft G150F200 (manufactured by Central Glass Co., Ltd.), which is a polymer of vinylidene fluoride resin and chlorotrifluoroethylene, was applied as an electrode protection resin so as to have a thickness of 100 μm to form a medium transport belt. The electrode protective resin film used had a volume resistivity of 1.5 × 10 ¹³ Ω · cm, a dielectric constant of 10, and a melting point of 160 ° C.

In order to measure the adsorbing force of the paper of the medium transport belt 10, a DC voltage of 3 kV is applied between the electrodes of the electrode pattern 14, and as shown in FIG. Was adsorbed. Thereafter, the paper 40 was pulled in a direction parallel to the surface of the belt 10 in the direction of the arrow in the figure, and the maximum force when the paper 40 was moved was measured as the attraction force. The measured adsorption power was 15.8 kg, which was good. Further, this belt is connected to a belt traveling device 80 shown in FIG.
When the belt 84 was driven and run on the roller 82 at a speed of 10 rotations per minute for one hour, the meandering range of the belt was within 2 mm, which was good.

[Example 2] The same as Example 1 except that the difference between the peripheral lengths of the end portion and the other end of the belt was 0.3 mm when the films on which the electrode patterns were formed were bonded by a bonding method. A belt was made. The paper had an adsorption power of 15.8 kg on this belt. In addition, as a result of driving and running the belt in the same manner as in Example 1, the meandering range was 1 mm. [Comparative Example 1] A belt similar to that in Example 1 was prepared except that the difference in the circumferential length between the end portion and the other end of the belt was 1.2 mm when the film on which the electrode pattern was formed was bonded by a bonding method. did. The paper has a suction power of 15.
It was 8 kg. However, as a result of driving and running the belt in the same manner as in Example 1, the meandering range was as large as 5 mm, and the running stability of the belt was impossible.

[0072]

In the medium transport belt according to the present invention, the electrode protection resin layer has a predetermined volume specific resistance and a dielectric constant, and the circumferential length difference is suppressed to within 1.0 mm. Excellent electrostatic attraction force is obtained, without meandering
Paper, OHP and the like can be sufficiently absorbed and transported with high accuracy.

[0073]

[Brief description of the drawings]

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

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

FIG. 3 is an explanatory plan view of a main part showing an embodiment of a method for manufacturing the medium transport belt shown in FIG. 1;

FIG. 4 is an enlarged sectional explanatory view of a main part showing another embodiment of the medium transport belt according to the present invention.

FIG. 5 is an enlarged sectional explanatory view of a main part showing still another embodiment of the medium transport belt according to the present invention.

FIG. 6 is an enlarged sectional explanatory view of a main part showing still another embodiment of the medium transport belt according to the present invention.

FIG. 7 is an explanatory plan view of a main part showing a method for testing the suction force of the medium transport belt according to the present invention.

FIG. 8 is a plan view of a belt traveling device for checking meandering of the medium transport belt during traveling according to the present invention.

[Explanation of symbols]

 10, 24, 28, 30: Medium transport belt 12: Polymer tubular material 14: Electrode pattern 16: Electrode protective layer 20: Outer peripheral layer 22, 26, 32: Resin layer 60: Paper

Continued on the front page F term (reference) 3F049 AA02 AA06 BB11 LA02 LA05 LA07 LB08 4F100 AB24 AK03C AK12C AK17 AK17C AK19 AK25C AK42A AK43A AK45A AK49A AK50A AK53 CA11CA01 CA21A01 CA21A01 CA23A01BAK EH46 GB41 JB06C JB16A JG01B JG01C JG01H JG04C JG04H JG05C JL01 JL05 YY00C

Claims (9)

[Claims] An electrode pattern having conductivity is formed on an outer peripheral surface of a tubular article formed of a polymer material, and a volume resistivity of 10 ⁹ to 1 is formed on the electrode pattern.
A medium transport belt on which an electrode protection layer having a thickness of 0 ¹⁵ Ω · cm and a dielectric constant of 3.0 or more and 30.0 or less is formed,
A medium transport belt, wherein a difference in circumferential length of the medium transport belt is 1.0 mm or less. 2. The medium transport belt according to claim 1, wherein a difference in the peripheral length between both ends of the medium transport belt is 0.5 mm or less. 3. The polymer material is made of non-thermoplastic polyimide, thermoplastic polyimide, polyethersulfone, polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, polyetherimide, polysulfone, polyamideimide, polyetherimide, polyetherimide. The medium transport belt according to claim 1, wherein the medium transport belt is at least one material selected from the group consisting of arylate and polycarbonate. 4. The medium transport belt according to claim 1, wherein the electrode protection layer is a resin alone or a composite resin obtained by mixing an additive with the resin. 5. The medium transport belt according to claim 4, wherein the additive is a conductive powder, a high dielectric constant powder, or a combination thereof. 6. The medium transport belt according to claim 4, wherein the resin is a resin having a water absorption of 1% or less. 7. The method according to claim 1, wherein the resin is —CH ₂ —CR ₁ R ₂ —
(Where R ₁ or R ₂ represents H, CH ₃ , Ph or COOX, and X is an organic group), an olefin resin, a styrene resin, or an acrylic resin, or —CH ₂ The medium transport belt according to claim 4, wherein the medium transport belt is an olefin resin, a styrene resin, or an acrylic resin having a structure of —CR ₁ R ₂ — of 30 vol% or more. 8. The resin according to claim 1, wherein the resin is -CF ₂ -CFR _3- (where R ₃ is H, Cl or F), -CH ₂ -C
A fluorine-based resin having a structure of F ₂ — or —CH ₂ —CHF— or —CF ₂ —CFR ₃ — (where R
_3, H, Cl or _{F), - CH 2 -CF 2} -
6. The medium transport belt according to claim 4, wherein the medium transport belt is a resin containing 30 vol% or more of a fluorine-based resin having a structure of —CH ₂ —CHF—. 7. 9. A water absorption rate of 1% on an outer peripheral surface of the electrode protection layer.
9. The medium transport belt according to claim 1, wherein an outer peripheral layer made of the following resin is formed.