JP2003039011A - Method for manufacturing feed member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a feed member with good productivity at a low cost by a simple process while reducing environmental load. SOLUTION: The feed member is manufactured by electrically attracting and bonding a powder coating containing an inorganic powder, which is prepared by providing a resin coating layer to the surface of particles, to the surface of a metal shaft body by electrostatic coating and applying baking treatment to the coated metal shaft body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a carrying member. More specifically, the present invention relates to a transport member used in a site for transporting paper, a plastic sheet or the like in an OA device, a home electric appliance, a printing device or the like, and an inorganic powder on a surface of a metal shaft body together with a binder resin. The present invention relates to a method for manufacturing a conveying member with low productivity by reducing the load on the environment by fixing it by electrostatic coating.

[0002]

2. Description of the Related Art Generally, a transporting member such as a paper feed roller is, for example, a copying machine, a laser printer, an electrophotographic device such as a facsimile, an electrostatic recording device, an automatic teller machine (ATM), a money changer, a counter. , Vending machines, cash dispensers (CDs), home electric appliances, various printing devices, etc., are used for parts that convey paper, plastic sheets, and the like, and there are grid rollers as types of rollers. Examples of such a transport member include (1) a steel material coated with rubber and then coated with rubber, and further coated with polytetrafluoroethylene, (2) a steel material subjected to electroless plating, In addition, composite plating containing SiC, diamond, etc., (3) steel surface roughened by sandblasting, laser light, etc. (4) coating liquid with fine metal particles or filler mixed in the paint It is known that a steel material is subjected to spray coating, and (5) a base material is provided with an electrodeposition coating containing inorganic powder.

However, in the above-mentioned carrying member (1), due to a change over time due to repeated use, rubber is likely to be deformed, resulting in poor carrying, a long processing step, and poor productivity. There's a problem. In the case of composite plating, the transport member of (2) is likely to be unstable due to impurities mixed in the bath, and it is difficult to withstand continuous use.
There are problems such as high cost of the plating solution. In the transportation member of (3), the steel material whose surface is roughened by sandblasting is likely to rust, so it is necessary to perform anticorrosion treatment such as plating for the purpose of anticorrosion, and the outer diameter accuracy decreases. ,
Moreover, there is a problem that the cost is high due to the increase in the number of steps. Further, the performance and quality of the carrying member are limited depending on the material of the steel material, and it is difficult to satisfy the required performance when the carrying member is a grid roller. On the other hand, in the case of the transport member having the surface of the steel material roughened by the laser light, there is a problem that it is difficult to mass-produce since only one roller can be processed at a time and the processing time is long. The carrying member (4) has problems such as poor mass productivity, easy unevenness of the surface state, and environmental load, and the carrying member (5) requires a large equipment cost. In addition to being expensive, the surface of the base material that has been pulled up from the tank after electrodeposition has uncoated electrodeposition paint, so if you do not completely remove it by spraying water, the coating will become uneven,
In addition, there are problems that defects such as poor water resistance are likely to occur, and sufficient care must be taken in managing the electrodeposition bath.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the conventional conveying member, reduces the load on the environment by a simple process, improves productivity, and lowers the cost of the conveying member. It is intended to provide a method for manufacturing.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to achieve the above-mentioned object, and as a result, made an inorganic powder and a binder resin adhere to the surface of a metal shaft by electrostatic coating. It was found that the object can be achieved by baking. The present invention has been completed based on such findings. That is, the present invention is characterized in that a powder coating containing an inorganic powder having a resin coating layer on the particle surface is electrostatically attracted and adhered to the surface of the metal shaft body by electrostatic coating, and then baked. The present invention provides a method for manufacturing a carrying member.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The method for producing a carrying member of the present invention comprises applying a powder coating material containing an inorganic powder and a binder resin to the surface of a metal shaft body by electrostatic coating and baking it. It is a method of manufacturing a member for transportation. The metal shaft used in this method is not particularly limited, and those conventionally used as a metal shaft in a carrying member can be used. Examples of the material include aluminum, aluminum alloys, stainless steel,
Examples thereof include magnesium alloys, and the shape thereof is not particularly limited, but a roller shape is preferable.

On the other hand, as the powder coating material, a powder coating material containing an inorganic powder having a resin coating layer on the particle surface is used. Such a powder coating material (mylocoat coating material) has excellent properties as compared with a powder coating material (dry blend coating material) prepared by dry blending an inorganic powder and a resin powder without using a solvent. It is a thing. That is, in the dry blend paint, when the powder is charged, since the charge amount of the inorganic powder and the resin powder are different, it is difficult to control the adhesion amount to the object to be coated, and uneven coating occurs. Since the microcoat paint is an inorganic powder coated with a resin and integrated, it is easy to control the amount of adhesion to the object to be coated, and uneven coating does not occur, resulting in a uniform coating film. Is what you get.

Examples of the inorganic powder used in the powder coating material include ceramic powder, metal powder, and metallized ceramic powder obtained by subjecting the particle surface of ceramic powder to metal plating. Here, the ceramic powder is not particularly limited and various ones may be used, such as SiC, SiO ₂ , Si ₃ N ₄ , TaC,
Preferable examples include ZrO ₂ , Al ₂ O ₃ , and NbC. The metal powder is not particularly limited and various ones may be used, such as Ag, Co, Cu, Fe and M.
Examples include n, Ni, Pd, Sn, Te, and the like. Further, examples of the metallized ceramics powder include powders having a metal plating film of Ag, Ni, Cu or the like on the particle surface of the ceramics powder.

The average particle size of these inorganic powders is usually 1
It is in the range of 0 to 100 μm, preferably 20 to 60 μm. Further, these inorganic powders may be used alone or in combination of two or more, and among them, alumina powder is preferable. On the other hand, as the resin coating layer in the inorganic powder having a resin coating layer on the particle surface used for the powder coating, for example, epoxy resin, aminoalkyd resin, thermosetting resin such as thermosetting acrylic resin, Thermoplastic resins such as vinyl chloride resins, polyolefin resins, polyamide resins, polyester resins are used. Of these, epoxy resins are particularly preferable.

In the present invention, in the coating material paint containing the inorganic powder having the resin coating layer on the particle surface, the ratio of the inorganic powder to the resin is 50:50 to 95: 5 by weight. Is preferred.

In the method of the present invention, these powder coating materials are first electrostatically attracted and adhered to the surface of the metal shaft by electrostatic coating. As a method of attaching the powder coating material to an object to be coated (metal shaft) by this electrostatic coating, there are conventionally known methods, that is, an electrostatic spraying method and an electrostatic flow dipping method. Any of these can be used, but the electrostatic spraying method is preferable from the viewpoint of uniform adhesion of the powder coating material.

In the electrostatic spraying method, a powder paint negatively charged is passed through a nozzle of a spray gun to which a high voltage is applied,
Spray on the object (metal shaft) that is grounded and kept at a positive potential,
This is a method of electrostatically attracting and adhering. In this method, preheating of the object to be coated (metal shaft) before coating is not always necessary. Also, when the adhered powder reaches a certain thickness, it is electrically saturated and does not adhere to a thickness greater than that, but the film thickness distribution is uniform and the size of the coated object is limited. There are advantages such as not. If it is desired to attach the powder particularly thickly, if the object to be coated is preheated to about 50 to 80 ° C., the electric resistance value of the powder attached first decreases, the repulsive force becomes small, and the powder adheres thickly. It is also possible to adopt a hot coating method in which the surface to be coated is attached in a state of being preheated to the melting temperature of the resin in the powder coating material or higher.

FIG. 1 is an explanatory view showing an example of a method of adhering a powder coating material to the surface of a metal shaft body by an electrostatic spraying method in the present invention. Electrostatic spray gun 1, powder supply tank 2, air compressor 3
And a high voltage generator 4. This powder electrostatic coating device 10 is used to spray the powder coating material contained in the powder supply tank 2 together with the compressed air from the air compressor 3 into a powder for which a high voltage is applied by the high voltage generator 4. Gun 1
It is negatively charged through the nozzle and sprayed onto the metal shaft 5 of the object to be coated. Since both ends of the metal shaft body 5 are protected by the masking tape 6, the metal shaft body 5 rotates at a constant speed around the vertical axis, and is grounded and kept at a positive potential.
The powder paint electrostatically attracts and adheres to a desired portion. In addition,
The paint may be sprayed while fixing the metal shaft 5 and moving the spray gun 1 around the metal shaft 5. Also,
The spray gun 1 can spray paint while moving up and down.

In this electrostatic coating, the metal shaft may be coated with a primer in advance, if desired, for the purpose of improving the adhesion of the powder coating material. In particular, when the powder coating material contains a vinyl chloride resin or a polyamide resin, the adhesion to metal is poor, so it is preferable to apply a primer. Further, in the electrostatic spraying method, the oversprayed powder coating material has an advantage that it can be used any number of times. In order to collect the oversprayed powder, an open or closed spray booth is usually installed.

Next, the powder coating material is adhered to the surface of the metal shaft body in a uniform thickness in this manner, and then baked. The baking treatment is usually carried out in an oven or a furnace, and the baking treatment temperature depends on the type of resin in the powder coating used, but is usually selected in the range of 150 to 250 ° C.
In this way, a carrying member having a coating layer containing an inorganic powder on the surface of the metal shaft is obtained. The thickness of the coating layer is usually 10 to 200 μm, preferably 50 to 15 μm.
It is in the range of 0 μm. The method of forming the coating layer by powder electrostatic coating has the following effects.

(1) There is a high degree of freedom in selection of materials, and it is possible to use inorganic powders having various types and particle sizes, and various types of binder resins. (2) The surface roughness of the coating layer can be easily controlled by the particle size of the inorganic powder. (3) The electric resistance value of the coating layer can be easily controlled by selecting the type of the inorganic powder. (4) Since the powder coating material that is not attached to the metal shaft is collected and reused, no industrial waste is produced, and no organic solvent is used, so the load on the environment is small.

The carrying member obtained by the method of the present invention is, for example, an electrophotographic device such as a copying machine, a laser printer or a facsimile, an electrostatic recording device, an ink jet printer, an automatic teller machine (ATM) or a money changer. , Counter, vending machine, cash dispenser (CD)
It is used for devices having various transport mechanisms such as. Specific examples of the transport member include a grid roller.

[0018]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples. Example 1 90% by weight of alumina powder having an average particle size of 35 μm and an epoxy resin [manufactured by Tokyo Paint Co., Ltd., trade name “PAWSET EP
-100 "] 10% by weight was used to prepare an epoxy resin-coated alumina powder coating. 30m from both ends of aluminum roller with 10mm diameter and 300mm length
The powder coating material was adhered to a metal shaft body having a region m marked with masking with tape according to the electrostatic spraying method shown in FIG. The conditions of electrostatic spraying were a negative voltage of the spray gun of 100 kV, a paint ejection rate of 16 g / min, a distance between the spray gun and the metal shaft of 7 cm, a paint ejection time of 15 seconds, and a temperature of the metal shaft of 23 ° C. Next, in order to evaluate the wear resistance of this transport roller, the coefficient of friction was determined according to JISK712.
5, applied load: 2.65, paper moving speed: 70 m
m / sec, paper: XEROX-4024DP, measurement environment:
The measurement was performed under the conditions of a temperature of 23 ° C. and a relative temperature of 56%. As a result, the coefficient of friction was 1.8 before passing 5000 sheets, 1.7 after passing 5000 sheets, 1.5 after passing 10,000 sheets, and 1.4 after passing 150,000 sheets. It showed wear resistance.

[0019]

According to the present invention, OA equipment, home appliances,
In a printing machine or the like, a transport member used for transporting paper or a plastic sheet is fixed on the surface of the metal shaft body together with a binder resin by an electrostatic coating method to improve productivity, At low cost,
In addition, it can be manufactured without giving much load to the environment.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a method for adhering a powder coating material to the surface of a metal shaft body by an electrostatic spraying method in the present invention.

[Explanation of symbols]

1 Electrostatic spray gun for powder 2 Powder supply tank 3 air compressor 4 High voltage generator 5 Object to be coated (metal shaft) 6 Masking tape 10 Powder electrostatic coating equipment

Continued front page    F term (reference) 3F049 AA03 CA01 CA12 LA02 LA06                       LB03                 4D075 AA09 AA82 BB26Z BB92Z                       BB93Z CA13 CA22 CA33                       CA48 DA10 DA15 DA20 DB01                       DB02 DB04 DB07 DC16 DC19                       DC24 EA02 EB13 EB15 EB32                       EB33 EB35 EB36 EB39 EB56                       EC02 EC05 EC10 EC53 EC54

Claims (7)

[Claims] 1. A powder coating containing an inorganic powder having a resin coating layer on the particle surface is electrostatically attracted to the surface of the metal shaft by electrostatic coating, and then baked. A method for manufacturing a transport member. 2. The average particle size of the inorganic powder is 10 to 100 μm.
The method for manufacturing a member for transport according to claim 1, wherein m is m. 3. The method for manufacturing a carrying member according to claim 1, wherein the inorganic powder is alumina powder. 4. The method for producing a carrying member according to claim 1, wherein the resin coating layer in the inorganic powder having a resin coating layer on the particle surface is made of an epoxy resin. 5. A powder coating material containing an inorganic powder having a resin coating layer on the particle surface, wherein the weight ratio of the inorganic powder to the resin is 50:50 to 95: 5. 4. The method for manufacturing a carrying member according to any one of 4 above. 6. The method for manufacturing a carrying member according to claim 1, wherein the baking treatment is performed at a temperature of 150 to 250 ° C. 7. The thickness of the coating layer containing the inorganic powder formed by the baking treatment is 10 to 200 μm.
7. The method for manufacturing the transport member according to any one of 1 to 6.