JP2005169873A - Composite material molded body, its production method, development device, and imaging apparatus having the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite material molded (laminated) body which can prevent the peeling of a surface layer with the passage of time and is improved in toner electrification properties by using a fluorine-containing material when a metallic material is used as a substrate in office automation (OA) equipment, and the fluorine-containing material is used in its outermost surface layer, its production method, a development device using the molded body, and an imaging apparatus having the device. <P>SOLUTION: In the composite material molded body used in the office automation equipment, on the outermost layer on the metal substrate 18, a resin layer (a)19 comprising a crosslinked condensate between a fluorine-containing resin having fluorine groups and hydroxy groups in a molecule and an amino resin having at least one kind of triazine ring and the self condensate of the amino resin is formed, and at least one resin layer (b)20 is formed between the resin layer (a)19 and the metal substrate 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a composite material molded body for use in OA equipment such as a toner carrier, a charging member, a transfer member, a cleaning member, and a paper conveying member of a developing device in an electrophotographic image forming apparatus, a manufacturing method thereof, and a developing device. And an image forming apparatus including the same.

  In the electrophotographic process, since toner intervenes, it is desired to prevent the toner from adhering to or adhering to parts around the electrostatic latent image carrier.

  Since the charging member, toner carrier, transfer member, etc. are accompanied by toner adhesion on the member surface and each member rotates in contact with the other member, the toner melts over time due to stress applied to the toner, It may stick to the surface of the member.

  For this reason, it is often used to coat a material that prevents toner from adhering to the surface of the member. As a material for preventing toner adhesion, a fluorine-based material is well known and is actually used.

  However, such a fluorine-based material adheres relatively easily to an organic material such as rubber or resin, but has a drawback that metal materials such as aluminum and stainless steel have low adhesion.

  In the case of a toner carrier, the toner adheres to the surface of the carrier since the latent image of the electrostatic latent image carrier is developed by directly carrying the toner or the developer mixed with the toner on the surface of the carrier. In addition, since the toner is subjected to strong stress on the carrier, the toner may be fused over time.

  In particular, in the case of a one-component developing method using only toner, the toner supply member or the toner regulating member is brought into strong contact with the toner carrying member in order to charge the toner on the toner carrying member, so that the toner fixation becomes more remarkable. It tends to occur. In order to prevent this toner sticking, a fluorine-based material is used on the surface of the toner carrier.

  Therefore, conventionally, the toner carrier is mostly formed of a fluorine-based material as a surface layer on a rubber substrate. In the case of a rubber substrate, the adhesion between the surface layer and the rubber substrate is as described above. Good, but the problem is that the surface is rough.

  However, in a toner carrier using a metal as a substrate, when a fluorine-based material is used as a surface layer, the surface layer peels off over time at the contact portion of the toner carrier end with the toner seal member. This is considered to be because the fluorine-based material is apparently in close contact with the metal material but is not adhered.

  By the way, it is used in electrophotographic image forming apparatuses such as copying machines and printers, and is used to adhere and support an elastic blade made of polyurethane resin, etc., and to prevent toner deterioration and toner scattering during development. Developing rollers having a conductive fluororesin layer are also known (for example, Japanese Patent Application Laid-Open Nos. 2002-099141, 2002-14534, 2002-323816, and Patent Documents 1 to 3).

The technique described in Patent Document 2 has a problem of obtaining a good image and maintaining a good image over a long period of time. The developing roller has a semiconductive resin layer on the outer periphery of a metallic roller. It is disclosed that the resin layer contains a urine fluororesin and / or a melamine resin.
In addition, it is disclosed that the conductive resin layer contains one or more resins selected from alkyd resins, modified alkyd resins, oil-free alkyd resins, and acrylic resins.
Further, the conductive resin layer contains a friction reducing agent selected from silicon resin, fluororesin, fluorosurfactant, silicon surfactant, silicon coupling agent and silica powder, and the metal roller is made of aluminum. It is disclosed to be formed from stainless steel and iron alloys.

Patent Document 3 discloses a developing device having a developing roller, a toner supply roller that is disposed so as to be in contact with the developing roller and supplies toner to the developing roller, and a regulating member that regulates the amount of toner adhering to the developing roller Is disclosed.
The toner regulating member is a toner regulating roller, and the developing roller is formed by forming a surface layer made of polyester resin, guanamine resin, and ITO on an aluminum substrate.

  However, in Patent Documents 1 and 2, as described above, the fluororesin layer is formed on the elastic substrate. However, the fluororesin layer is not formed on the rigid substrate. There is no suggestion for improvement.

In Patent Document 3, carbon black is dispersed because the surface layer of the toner regulating member needs to be conductive. However, regarding the problem of film peeling, it was not sufficient for further high durability (lifetime).
Further, in order to improve the adhesion between the fluorine resin layer and the substrate, a resin layer having good adhesion is provided between both the fluorine resin layer and the substrate to prevent the fluorine resin from peeling off. However, it was not satisfactory.

  In addition, although fluorine-based materials are good for toner fixation, in the case of commonly used negatively chargeable toners, fluorine-based materials tend to be reversely charged as toner chargeability. There is also a problem that the toner charge amount becomes low.

JP 2002-099141 A Japanese Patent Laid-Open No. 2002-14534 Japanese Patent Laid-Open No. 2002-323816

  The object of the present invention is to prevent peeling of the surface layer over time when a metal material is used as a base in office automation (OA) equipment and a fluorine material is used for the outermost surface layer, and even when a fluorine material is used. It is an object of the present invention to provide a composite material molded (laminated) body having improved toner chargeability, a manufacturing method thereof, a developing device using the composite material molded body, and an image forming apparatus provided with the same.

(1) Condensation of a fluororesin having a fluorine group and a hydroxyl group in the molecule and an amino resin having one or more types of triazine rings in the outermost layer on the metal substrate in a composite material molded body used in office automation equipment A resin layer (a) comprising a crosslinked product and a self-condensation product of an amino resin is formed, and at least one or more resin layers (b) are formed between the resin layer (a) and the metal substrate. Composite material molded body characterized by
(2) The composite as described in (1) above, wherein the adhesive force of the resin layer (a) and the resin layer (b) to the metal is resin layer (a) <resin layer (b) Material molded body.
(3) The composite material molded body according to (1) or (2), wherein an interface between the resin layer (a) and the resin layer (b) is chemically bonded.
(4) The resin layer (b) is formed on the metal substrate, the resin layer (a) is formed thereon, and then the resin layer is crosslinked and cured. The composite material molded body according to any one of (1) to (3).
(5) The composite material molded body according to any one of (1) to (4), wherein the resin layer (a) and the resin layer (b) are conductive.
(6) The composite material molded body according to any one of (1) to (5), wherein the metal substrate surface cannot be visually confirmed through the resin layer.
(7) The composite according to any one of (1) to (6), wherein carbon black is added to at least one of the resin layer (a) and the resin layer (b). Material molded body.
(8) A method for manufacturing a composite material molded body for manufacturing the composite material molded body according to any one of (1) to (7), wherein the resin layer (b) is formed on the metal substrate, Subsequently, the resin layer (a) is formed thereon, and then the resin layer is crosslinked and cured.
(9) The conductive composite material molded body supplies toner to the surface of the image bearing member in contact with or in proximity to the photosensitive member on which the electrostatic latent image is formed while carrying and rotating the toner. The composite material molded article according to any one of (5) to (7), wherein the molded article is a toner carrier that visualizes an electrostatic latent image.
(10) A toner supply member that supplies toner to the toner carrier described in (9), a toner regulation member that regulates toner on the toner carrier and forms a thin layer, and that the toner leaks. A developing device, wherein a toner seal member for prevention is disposed in contact.
(11) The present invention is characterized in that a non-coating portion is provided at the end of the toner carrying member, and the toner carrying member is such that the non-molded portion length of each resin layer is resin layer (a)> resin layer (b). The developing device according to (10).
(12) The developing device according to (10) or (11), wherein the resin layer (a) of the toner carrier includes a toner carrier that is worn according to the number of prints.
(13) An image forming apparatus using a developing device having the toner carrier according to any one of (9) to (12).

  According to the present invention, when a composite material molded body used in OA equipment is used, for example, in an image forming apparatus of an electrophotographic process, by using a metal substrate, it is difficult to use a rubber material in the image forming apparatus. The surface roughness of the parts used can be reduced, and by using a fluororesin having a fluorine group and a hydroxyl group in the molecule and an amino resin having one or more types of triazine rings, the toner is difficult to adhere and Even if the toner is fixed, it gradually wears over time, so that the fixed toner can be removed, and a composite material molded body that can achieve a long life of the developing device can be provided.

  Further, in the present invention, the amino resin having a triazine ring with good toner charge can compensate for the poor toner chargeability of the fluororesin, and is stable by crosslinking the hydroxyl group of the fluororesin with the amino resin. The formed resin layer can be formed.

  In addition, since a resin layer containing a fluorine-based resin generally has poor adhesion to a metal substrate, in the present invention, a chemical surface treatment (resin layer) having good adhesion to the metal is formed on the metal substrate. The resin layer can be prevented from peeling off even when the resin layer containing the resin is subjected to strong stress due to contact / sliding with another member.

  Furthermore, according to the present invention, it is possible to provide a method for producing the composite material molded body, a developing device using the molded body, and an image forming apparatus including the same.

  The present inventors have a structure in which a developing roller (toner carrier) has a coating layer on a conductive substrate, and the coating layer includes a resin having a fluorine group and a hydroxyl group in a molecule, and one or more kinds of resins. Studies have also been made on the formation of condensation crosslinked products with amino resins and self-condensation products of amino resins.

  Further, the outermost layer on the metal substrate comprises a condensation-crosslinked product of a fluororesin having a fluorine group and a hydroxyl group in the molecule and an amino resin having at least one triazine ring, and a self-condensation product of the amino resin. Studies have also been conducted to form a resin layer.

As a result of further studies, the present inventors have found that a resin layer (a) comprising a condensation cross-linked product of the fluororesin and the amino resin having a triazine ring and a self-condensation product of the amino resin and the metal substrate By forming at least one resin layer (b) between them, it has been found that the above problems can be solved, and the present invention has been completed.
As a composite material molded body for OA equipment of the present invention, a toner carrier is taken as an example and will be described in more detail below.

  In the present invention, if the surface layer of the toner carrier is a fluororesin alone, the toner chargeability is lowered. Therefore, a fluororesin having a fluorine group and a hydroxyl group in the molecule is used, and an amino resin having a triazine ring is used. By forming a condensation crosslinked product with the hydroxyl group of the fluororesin, toner chargeability can be imparted and the strength of the surface layer can be increased. Here, the resin layer is three-dimensionally cross-linked by cross-linking the amino resin and the fluororesin having a hydroxyl group. Amino resins do not exist alone. In addition, amino resins are not present alone because they are condensed and crosslinked.

  In addition, since the fluororesin has low adhesion to metal, it increases the adhesion between the fluororesin layer and the surface of the metal substrate, and even if a strong force (strong stress such as twisting force) is applied to the fluororesin layer, the fluororesin In order to prevent the layer from peeling off, at least one resin layer (b) is provided between the layer (a) containing the fluororesin and the metal substrate.

  Furthermore, in the present invention, since the fluororesin has a low adhesive strength to the metal, it peels off when a strong force is applied on the metal. Therefore, the adhesive strength with the metal as the resin layer (b) is higher than that of the fluororesin. By providing a larger resin layer between the fluororesin layer and the metal substrate, peeling of the fluororesin layer can be prevented.

  And if the adhesiveness between the fluororesin layer and the resin layer formed on the metal substrate is poor, the fluororesin layer will be peeled off. To prevent.

  In order to chemically bond the interfaces of the laminated resin layers, the resin layers are laminated and then heated to crosslink and cure the resin layers and to chemically bond them at the resin layer interfaces.

  In order to use the composite material (laminated) body as a part to be incorporated in an electrophotographic image forming apparatus, both resin layers are made conductive so that voltage can be applied so that electricity can be conducted.

  Moreover, in the manufacturing process of a composite molded object, since the surface property of a molded object is very important, an external appearance inspection is performed. It is preferable to prevent an increase in the load of the inspection process (decrease in efficiency) due to the detection of minor defects in the core metal during the inspection of the molded body.

  In high-precision parts, defects on the resin layer surface are regarded as important, but if the metal substrate can be confirmed through the resin layer, it is difficult to distinguish minor defects on the substrate from resin layer surface defects. This will increase the process load. As a result, it tends to result in excessive quality. In order to prevent this, it is preferable that the surface of the metal substrate cannot be recognized visually.

  In order to prevent the metal substrate from being permeated through the resin, at least one of the resin layers is preferably black. Carbon black is satisfactory because it is sufficiently black even when added in a small amount of about 1% by weight in order to color the resin layer black, and other physical properties are not impaired.

The toner carrier comprising the composite material molded body of the present invention can satisfactorily carry the toner for visualizing the electrostatic latent image, imparts stable toner charge, and is stable on the toner carrier. Thus, it is possible to regulate the supplied toner and a stable toner adhesion amount, and to prevent problems such as toner scattering. It is possible to prevent the toner on the toner carrier from sticking to the upper end of the carrier over time.
Further, the inner resin layer (resin layer b) can be prevented from peeling off at the boundary between the resin layer non-molded portion and the molded portion provided at the end of the toner carrier.

  Further, according to the present invention, it is possible to provide a developing device using a conductive composite molded body. Then, it is possible to prevent the toner on the toner carrying member from adhering to the carrying member over time, and to provide an image forming apparatus with stable image quality over time.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram showing a color image forming apparatus to which a composite material molded body according to the present invention can be applied. The image forming apparatus A includes a photosensitive belt 1, a charging unit 2, an optical writing unit 3, a cleaning blade 4, a coating unit 5, a developing device 6, a transfer belt 7 and a fixing device 8.

  FIG. 2 is a schematic sectional view showing the developing device of FIG. The developing device includes a toner 11 contained in a case 10, a stirring member 12 for stirring the toner, a toner carrier 13, a toner supply member 14 for supplying the toner 11 to the toner carrier 13, and a toner to the toner carrier 13. The toner restricting member 15 is configured to restrict supply, and the spring 16 elastically supports the toner restricting member 15.

  FIG. 3 is a cross-sectional view of the toner carrier of FIG. FIG. 4 is a front view showing the toner carrier of FIG. The toner carrier 13 includes a metal substrate (core metal) 18, an outer resin layer (resin layer a) 19, and an inner resin layer (resin layer b) 20 around a central shaft 17.

Next, each material in the present invention will be described.
In the embodiment of the present invention, the metal substrate (core metal) 18 may be made of a metal material such as aluminum, SUS (stainless steel), or iron. Aluminum is often used in terms of workability and lightness. In the case of aluminum, A6063, A5056, A3003, etc., and in the case of SUS, 303, 304, 416, etc. can be used.

  Regarding the outer resin layer (resin layer a) 19, the fluororesin is a copolymer of fluoroethylene and vinyl ether, and of course has a fluorine group in the molecule. It is important to have a hydroxyl group for crosslinking reaction. Such a fluorine-based resin is characterized by being soluble in a solvent.

  As the amino resin, an amino resin having a triazine ring with many nitrogen groups, which are functional groups that impart chargeability to the toner, is desirable. Specifically, a melamine resin having 6 nitrogen atoms in the molecule and a guanamine resin having 5 are desirable.

  There are various types of melamine resin and guanamine resin depending on the type and number of functional groups added to the triazine ring, and any resin can be used. Even if two or more kinds are mixed and used, the processability and characteristics are not limited.

  The fluororesin and the amino resin have a crosslinked structure by a condensation reaction between the hydroxyl group of the fluororesin and the functional group of the amino resin. This improves the mechanical properties of the coating film and the physical properties of the coating film such as water resistance.

  The addition amount of the amino resin is preferably in the range of 5 to 80 parts by weight with respect to 100 parts by weight of the fluororesin, and is added to obtain an appropriate charge amount depending on the toner to be used and to adjust the wear amount. The amount can be changed arbitrarily.

  The most important characteristic of the inner resin layer (resin layer b) 20 is that it adheres to the metal substrate 18, and the adhesive force is preferably resin layer (a) <resin layer (b). As the resin that adheres to the metal substrate, a polyester resin that is used as a coating agent for PCM (pre-coated metal) can be used.

  In the case of PCM in the resin layer (b), the polyester resin is generally crosslinked with a melamine resin. In the present invention, the polyester resin may be used alone, but in order to improve the adhesiveness at the interface with the resin layer (a) 19, the resin layer (b) 20 used as the adhesive layer is also used. It is desirable to add an amino resin.

  In addition to the polyester resin, a resin such as an acrylic resin or an epoxy resin can also be used, and these resins may be used alone or with an amino resin added. In terms of adhesiveness with the resin layer (a) 19, it is desirable to add an amino resin. The addition amount of the amino resin is preferably in the range of 5 to 80 parts by weight with respect to 100 parts by weight of the resin.

  Regarding the processing method, the resin layer (a) 19, the resin layer (b) 20, the amino resin, the fluorine-based resin, and the polyester resin are cross-linked with each other at the resin layer interface, whereby the peel strength of the resin layer (a). Will be very expensive.

  As described above, as a method for increasing the adhesive force at the interface of each resin layer, it is desirable to cause a crosslinking reaction by heating and curing after successively laminating the resin layers. A resin crosslinking system using an amino resin is a thermosetting type, and the reaction does not proceed unless heated.

  The composite material molded (laminated) body of the present invention is mainly used for a toner carrier incorporated in an electrophotographic image forming apparatus, a charging member, a transfer member, and the like. In these cases, it is necessary to have conductivity in order to apply a bias. In order to make it conductive, it is necessary to make the outer resin layer (resin layer a) 19 and the inner resin layer (resin layer b) 20, particularly the outer resin layer (resin layer a) 19, conductive.

  The method for imparting conductivity to the outer resin layer 19 is performed by adding various conductivity imparting agents. Regarding the conductivity-imparting agent, examples of the powder include conductive carbon such as ketjen black and acetylene black, and rubber carbon such as SAF, ISAF, HAF, FEF, GPF, SRF, FT, and MT.

  In addition, carbon for color, pyrolytic carbon, indium-doped tin oxide (ITO), tin oxide, titanium oxide, zinc oxide, copper, silver, germanium and other metal oxides, metal oxides, polyaniline, polypyrrole, etc. subjected to oxidation treatment, etc. And conductive polymers such as polyacetylene.

  In addition, as a conductivity imparting agent, there is also an ionic conductive material, an inorganic ionic conductive material such as sodium perchlorate, lithium perchlorate, calcium perchlorate, lithium chloride, and further, a modified fatty acid dimethyl ammonium ethosulphate, There are organic ionic conductive materials such as ammonium stearate acetate, lauryl ammonium acetate, and octadecyltrimethylammonium perchlorate.

The resistance value is a volume resistance value of about 1 × 10 ³ to 1 × 10 ⁶ Ω, and a conductivity-imparting agent is added according to the required resistance value of the component. Carbon black is inexpensive and is a common conductivity imparting agent, but it is difficult to control the medium resistance region.

  Metal oxides are expensive, but resistance control is relatively easy and can be used. For example, ITO, which is a metal oxide, can be used in toner carriers such as Ricoh Ysiocolor 5000/5100 and Ricoh Ysiocolor 7000. As the magnitude of the resistance value of each resin layer, it is desirable that the resin layer (b) ≦ the resin layer (a).

  When the outer resin layer (resin layer a) 19 is formed on the metal substrate (core metal) 18, the resin layer (a) is not colored when the conductivity imparting agent is a metal oxide or ionic conductive agent. And the surface of the substrate can be visually confirmed.

  Parts such as charging members, toner carriers, and transfer members incorporated in the electrophotographic apparatus have extremely strict surface quality (surface roughness, protrusions, dents), etc., and 100% visual inspection is performed in the manufacturing process. It is common.

  When the outer resin layer 19 is formed on the metal substrate 18, there is no problem in quality even if there is a minor defect in the metal substrate 18, such as a scratch, a dent or a minute foreign matter in the resin layer. There is also.

  However, even for such a minor defect that seems to have no problem, since it is necessary to make a pros and cons determination in the inspection, the inspection time and burden become very large.

  Therefore, since the outer resin layer 19 is colored to make it impossible to recognize minor defects in the metal substrate 18 and minor defects in the outer resin layer 19, only the surface of the outer resin layer 19 needs to be inspected. The burden of the inspection process can be reduced.

  A method for coloring the outer resin layer 19 can be achieved by adding a coloring pigment such as carbon black, phthalocyanine blue, quinacdrine, carmine, etc. to the outer resin layer 19, and carbon black has good colorability even in a small amount. This is desirable.

  As an addition amount, it is sufficient if it can be colored, and 1 wt% or less is sufficient with respect to the resin. When carbon black is used as the conductivity imparting agent, it is not necessary to add a color pigment. The coloration of the resin layer (a) has been described above. However, at least one of the resin layers (a) and (b) may be colored, but both may be colored.

  As described above, by making it impossible to visually confirm the surface of the metal substrate through the resin layer, it is possible to omit inspection of defects that have no functional problems such as minor scratches on the metal substrate, or resin Since only the layer surface is inspected, the burden of the inspection process in the manufacturing process can be reduced.

The configuration in the case where the conductive composite molded body of FIGS. 3 and 4 described above is used as the toner carrier 13 will be further described.
The toner carrier 13 has a structure in which a resin layer (a) 19 is laminated on a conductive resin layer (b) 20 having good adhesion to a metal on a metal core 18 such as aluminum or SUS.

  As the thickness of each resin layer, the resin layer (b) may be thick, but since it serves as an adhesive layer, it is desirable to make it as thin as possible in order to shorten the processing time. It is sufficient if the surface roughness (Rz) of the cored bar 18 is 5 μm or less.

  The thickness of the resin layer (a) can be arbitrarily set depending on the amount of wear of the resin depending on the lifetime of the developing device, but is approximately 10 to 30 μm. The shape of the toner carrier can be a roller or a belt.

  As a specific example of the developing device, a toner regulating member 15 as shown in FIG. 2 has a roller shape. When such a roller-shaped regulating member is used, since the toner carrier is hard, it is preferable that the regulating member is soft in order to form a nip with the toner regulating member 15.

  For this reason, in order to form a rubber layer in the form of a metal core and to provide toner releasability and slipperiness, it is desirable to use a resin layer formed on the surface. The toner regulating member 15 is pressed against the toner carrier 13 by an elastic member 16 such as a spring, and bites into the toner carrier 13 to form a nip.

  The operation of the toner regulating member 15 is performed when the toner carrier 13 develops the electrostatic latent image on the electrostatic latent image carrier (not shown) with toner (when the toner carrier is rotating). After the operation of developing the toner carrier 13 is completed, the toner restricting member 15 rotates by reverse rotation, and changes to a new contact surface.

  A one-way clutch is disposed at the end of the toner regulating member 15 so that it can rotate only in a predetermined direction. In addition to the intermittent rotation as in the present invention, the operation of the toner regulating member 15 can be rotated together with the toner carrier 13 at the time of development if the motor torque of the apparatus is sufficient and there is no problem such as banding. .

  The rotation direction may be forward or reverse with respect to the rotation direction of the toner carrier 13. Further, as the shape of the toner regulating member 15, a plate-shaped member can be used, and a material such as resin, rubber, metal, or the like can be used. The toner regulating member 15 is desirably conductive and adjusted in resistance when a voltage is applied, but may be insulative when a voltage is not applied.

  As the toner supply member 14, a roller-shaped member in which a foam is formed on a metal core can be used. The toner held in the foamed portion is supplied onto the toner carrier 13 by the toner supply member 14 biting into the toner carrier 13.

  The rotation direction of the toner supply member (roller) 14 may be forward or reverse with respect to the rotation direction of the toner carrier 13. The toner regulating member 15 abuts over the entire area of the toner carrier 13 and regulates the amount of toner supplied onto the toner carrier 13.

  In such a developing device, a toner seal is important in order to prevent toner from leaking from the inside of the device. In particular, there are many gaps at the end of the toner carrier 13, and the toner is likely to leak.

  FIG. 5 is a cross-sectional view illustrating the toner carrier and the seal member. FIG. 6 is a front view of the toner carrier of FIG. According to the present invention, the end of the toner carrier 13 is provided with a pile (fiber) -like toner seal member 21 in the apparatus and brought into contact with the toner carrier 13 so that the toner leaks from the end. Is preventing.

  However, when the toner seal member 21 is in contact with the resin layer, the charged toner is more strongly charged and held on the surface of the toner carrier 13, and a strong compressive force is applied. It melts and becomes solid due to heat generation.

  When the solid body is sandwiched between the toner seal member 21 and the toner carrier 13 or between the toner carrier 13 and the toner regulating member 15, a gap is generated, and the toner is scattered from that portion. For this reason, it is desirable that the portion in contact with the toner seal member 21 at the end is configured not to be provided with a resin layer (non-coating portion 23).

  However, considering the accuracy of each member in the developing device, the accuracy of resin layer formation by coating, etc., it is difficult to make contact between the resin layer and the seal portion at the boundary, and the seal portion and the resin layer formation portion overlap each other by about 5 mm. It is desirable.

  When two or more resin layers are formed as in the present invention, the adhesion to the metal substrate 18 is poor by setting the length of the coating portion at the time of coating to resin layer (a) <resin layer (b). Since the resin layer (a) is not formed on the metal substrate 18, the resin layer (a) does not peel off at the overlap portion with the seal portion.

  The toner carrier 13 used in the present invention is in contact with the toner supply member 14 and the toner regulating member 15, and in particular, the pressure applied to the toner between the toner regulating member 15 and the toner carrier 13 is very large.

  Therefore, the toner is melted by pressure on the toner carrier 13 and adheres to the toner carrier 13, and then, the adhered toner becomes a nucleus, and the adhesion further proceeds, and a fixing state called toner filming. Form.

  Since the toner carrier 13 is subjected to strong contact and sliding with each member and the toner to which the inorganic additive is externally added is present at the contact portion, the toner acts like an abrasive, The toner carrier 13 is worn. Therefore, it is desirable that the surface of the toner carrier 13 has high wear resistance, but the toner fixed on the toner carrier 13 cannot be removed.

  Therefore, by slightly deteriorating the wear resistance of the surface (resin) layer material of the toner carrier 13, even if toner filming occurs, the filmed toner due to the abrasion of the toner carrier surface can be removed. .

  That is, as the toner carrier 13 of the developing device 6 in the image forming apparatus A, it is desirable that the surface of the toner carrier 13 is gradually worn according to the number of prints.

  The wearability of the surface of the toner carrier 13 can be changed depending on the type of material or the material configuration thereof, and can be determined as appropriate depending on the life of the developing device 6. In the present invention, toner filming is prevented by using a fluorine resin having poor wear properties.

  By using the toner carrier 13 and the image forming apparatus A using the developing device 6 on which the toner carrier 13 is mounted, the toner chargeability is stable over time and the toner does not scatter or leak. A stable image can be formed over time.

Next, the present invention will be specifically described based on examples.
Toner carrier shape: φ26mm, barrel length 330mm (A3 size), made of aluminum (three arrow tube shape; outer diameter part made of aluminum A6063, shaft part press-fitted with SUS303). After sequentially forming the resin layer (b), the resin layer (a) was formed, and then heated and cured in a hot air oven to obtain a toner carrier.

(Examples 1-5, Comparative Examples 1-4)
A toner carrier in which the resin layers (b) and (a) having the respective compositions as shown in Table 1 are laminated is incorporated in a developing device as shown in FIG. 2, and an Ipsio Color 7000 developing device is obtained. Image output was performed. Image output was performed with 60,000 continuous images in a 5% chart (A4 horizontal).

The composition of each resin layer (a), (b) and a production example of the toner carrier are shown below. In addition, a part is a weight part.
<Composition of resin layer (b)>
Base resin such as polyester resin, acrylic resin, epoxy resin ... 100 parts amino resin ... 30 parts ITO ... 54-61 parts (carbon black ... 30-50 parts)
<Composition of resin layer (a)>
Fluorine resin: 100 parts Amino resin: 50 parts For ITO: 54-61 parts (for carbon black: 30-50 parts)

  The resin having the composition of the resin layer (b) is mixed and dispersed, and after the paint diluted with the solvent is formed by spray coating on the metal substrate with a film thickness of about 4 μm, the resin having the composition of the resin layer (a) is mixed. A paint dispersed and diluted with a solvent was formed by spray coating to a thickness of about 10 μm on the resin layer (b), and then heated and cured at 160 ° C. for 1 hour to obtain a toner carrier.

The surface of the toner carrier was a smooth surface with an Rz of 2 μm or less. Both ends are 10 mm long, and a non-painted part is provided by a masking jig, and the length of the non-painted part of the resin layer (a) is 1 mm shorter from both sides than the length of the non-painted part of the resin layer (b). The masking jig was used for painting.
The resin layer is formed by degreasing the roller, washing with water, applying (spraying) the coating solution of the resin layer (b), and then applying (spraying) the coating solution of the resin layer (a), and then washing with water. . See Table 1 for the composition of the resin layer.

  The toner regulating member 15 is an elastic body because the toner carrier 13 is a rigid body. A paint in which a fluororesin, an isocyanate curing agent, and carbon black (added in 1 part to 100 parts of fluororesin) are dispersed on a rubber roller coated with NBR in which carbon black is dispersed on a S45C metal substrate 18 having a diameter of 10 mm. Was formed by spray coating to a thickness of about 20 μm. Note that the shape of the contour line in the axial direction is an arc shape in consideration of the deflection deformation of the contact load with the toner carrier.

  To further summarize the effects of the present invention described above, the use of the metal substrate 18 can reduce the surface roughness (which was difficult with a rubber material) of the components used in the image forming apparatus A.

  By using a fluororesin having a fluorine group and a hydroxyl group in the molecule and an amino resin having one or more types of triazine rings, the toner is difficult to be fixed, and even if the toner is fixed, it gradually wears over time. The fixed toner can be removed, and the life of the developing device 6 can be extended.

  Moreover, the poorness of the toner chargeability of the fluororesin can be compensated for by the amino resin having a triazine ring that is well charged with toner. A stable resin layer can be obtained by crosslinking the hydroxyl group of the fluororesin and the amino resin.

  Since the outer resin layer (resin layer a) 19 containing a fluorine-based resin has poor adhesion to the metal substrate 18, the inner adhesive layer (adhesive layer b) 20 having good adhesion to the metal is used as the resin layer (a) and the metal substrate. By forming in between, even if the resin layer (a) containing the fluorine-based resin is subjected to strong stress due to contact / sliding with other members, the resin layer can be prevented from peeling off.

  Even if a strong stress is applied to the fluororesin layer (a) by forming the resin layers (a) and (b) in which the adhesive force to the metal substrate 18 is resin layer (a) <resin layer (b), Peeling can be prevented.

  By chemically bonding the interface between the resin layer (a) and the resin layer (b), the resin layer (a) can be made more difficult to peel off. Further, by making the resin layers (a) and (b) conductive, a voltage can be applied to the OA equipment component.

  After the resin layer (b) is formed on the metal substrate 18, the resin layer (a) is laminated thereon, and then the cross-linking / curing is performed to increase the adhesive force at the interface between the resin layers (a) and (b). Can do.

  By preventing the surface of the metal substrate 18 from being visually confirmed through the resin layer, it is possible to omit inspection of defects that have no functional problems such as minor scratches on the metal substrate 18, or the surface of the resin layer Therefore, the burden of the inspection process in the manufacturing process can be reduced.

  Therefore, by adding carbon black to at least one of the resin layers (a) and (b), the resin layer becomes black, so that it cannot be visually confirmed through the surface of the metal substrate. Carbbon black acts as a pigment even in a small amount, and does not impair the physical properties of the resin layer.

  Since fluorine resin is used on the surface, the toner releasability is good and the wearability is good. Even if the toner is fixed, it can be removed by wear. By adding an amino resin to the resin layer on the surface, it can be used as a toner carrier that imparts sufficient chargeability to the toner.

  Due to the electrical conductivity, a voltage can be applied, and the charged toner can be moved by a potential difference between the electrostatic latent image carrier and the latent image on the electrostatic latent image carrier can be developed.

  A toner supply member 14 for supplying toner, a toner regulating member 15 for regulating the toner on the toner carrier 13 to form a thin layer, and a toner seal member 21 for preventing the toner from leaking are arranged in contact with the toner carrier 13. By doing so, it is possible to provide a non-magnetic one-component developing device in which toner chargeability is stable over time and toner does not scatter or leak.

  By providing the non-coating portion 23 at the end of the toner carrier, it is possible to prevent the toner compact from being generated between the resin layers (a) and (b) and the seal member. It is ensured that the resin layer (a) is formed on the metal substrate 18 by setting the length of the non-molded portion of each resin layer (a), (b) to resin layer (a)> resin layer (b). Can be prevented.

  As the resin layer (a) 19 wears according to the number of prints, it is possible to prevent toner and toner components from adhering to and depositing on the resin layer, and even if they adhere, they are removed by abrasion. can do.

  By incorporating a non-magnetic one-component developing device in which the toner chargeability is stable over time and the toner does not scatter or leak into the image forming apparatus, stable image quality can be provided over time.

It is the schematic which shows the color image forming apparatus which can apply the composite material molded object by this invention. FIG. 2 is a schematic cross-sectional view showing a developing device in the image forming apparatus of FIG. 1. FIG. 3 is a cross-sectional view of a toner carrier in the developing device of FIG. 2. FIG. 4 is a front view of the toner carrier in FIG. 3. FIG. 4 is a cross-sectional view illustrating a toner carrier and a seal member. FIG. 6 is a front view of the toner carrier in FIG. 5.

Explanation of symbols

A Image forming apparatus 1 Photoconductor (image carrier, photoconductor belt)
2 Charging means 3 Optical writing means 4 Cleaning blade 5 Application means 6 Developing device 7 Transfer belt 8 Fixing device 10 Case 11 Toner 12 Stirring member 13 Composite material molded body (toner carrier)
14 Toner supply member 15 Toner regulating member 16 Elastic member (spring)
17 shaft 18 metal base (core metal)
19 Outer resin layer (resin layer a)
20 Inner resin layer (resin layer b)
21 Toner seal member 23 Non-painted part

Claims (13)

  Condensation cross-linked product of a fluororesin having a fluorine group and a hydroxyl group in the molecule and an amino resin having one or more triazine rings in the outermost layer on a metal substrate in a composite material molded body used in office automation equipment And a resin layer (a) comprising a self-condensation product of an amino resin is formed, and at least one resin layer (b) is formed between the resin layer (a) and the metal substrate. Composite material molded body.   The composite material molded body according to claim 1, wherein an adhesive force of the resin layer (a) and the resin layer (b) to the metal is resin layer (a) <resin layer (b).   The composite material molded body according to claim 1 or 2, wherein an interface between the resin layer (a) and the resin layer (b) is chemically bonded.   The resin layer (b) is formed on the metal substrate, the resin layer (a) is formed thereon, and then the resin layer is crosslinked and cured. The composite material molded body according to any one of?   The composite material molded body according to any one of claims 1 to 4, wherein the resin layer (a) and the resin layer (b) are conductive.   The composite material molded body according to any one of claims 1 to 5, wherein the metal substrate surface cannot be visually confirmed through the resin layer.   The composite material molded body according to any one of claims 1 to 6, wherein carbon black is added to at least one of the resin layer (a) and the resin layer (b).   It is a manufacturing method of the composite material molded object which manufactures the composite material molded object in any one of Claims 1-7, Comprising: The said resin layer (b) is formed on the said metal base | substrate, and then the said resin is formed on it. A method for producing a composite material molded body, wherein the layer (a) is formed, and then the resin layer is crosslinked and cured.   The conductive composite material molded body supplies the toner to the surface of the image bearing member by contacting or in close proximity to the photosensitive member on which the electrostatic latent image is formed while carrying the toner and rotating. The composite material molded body according to claim 5, which is a toner carrier for visualizing an image.   10. A toner supply member that supplies toner to the toner carrier, a toner regulation member that regulates toner on the toner carrier and forms a thin layer, and a toner seal that prevents toner from leaking. A developing device in which members are arranged in contact with each other.   The non-coating portion is provided at an end portion of the toner carrier, and a toner carrier in which the non-molded portion length of each resin layer is such that the resin layer (a)> the resin layer (b) is provided. The developing device according to 10.   12. The developing device according to claim 10, wherein the resin layer (a) of the toner carrier is provided with a toner carrier that is worn according to the number of prints.   An image forming apparatus using the developing device having the toner carrier according to claim 9.

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