JP2000054112A - Masking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out easy and accurate masking and to make reutilizable masking materials by detachably fixing the masking materials by magnetic force on faces not to be treated in surface treatment. SOLUTION: The masking materials preferably have a structure formed by covering a part of a magnetic core material with a covering layer. The masking materials are obtd. by combining two members 2a and 2b and two members 3a and 3b, respectively, have a cylindrical structure and are fitted to terminal regions of a roller part 1. The members 2a and 2b and the members 3a and 3b are fixed on the terminal regions by attraction by magnetic force. In order to improve the adhesion, an elastic material is preferably used as the material of the covering layers. An upper flange shaft 4 is exposed so that it can be utilized as a holding part for transport or as an electrode in plating or coating by electrodeposition. The roller part 1 is plated with a plating soln. The plating soln. does not penetrate into the masked parts. After the plating, the masking materials 2 and 3 are divided, detached from the roller part 1 and reutilizable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for covering a part which does not require a surface treatment or a part which should not be subjected to a surface treatment when a member is subjected to various surface treatments such as plating, electrodeposition coating and spray coating. The present invention relates to a masking method for protecting, for example, a masking method suitable for masking at the time of surface treatment of a roller or the like used in an electrophotographic copying machine or printer.

[0002]

2. Description of the Related Art Conventionally, surface treatment and surface coating by plating and coating have been applied to all members, but in recent years the number of products has increased, such as electronic devices such as copiers and printers and personal computers of various types. Most of the components constituting word processors, mobile phones and the like are also subjected to surface treatment, and the surface treatment of these components requires precise and simple masking.

As a typical masking method, a method using a mold material for masking (mold method), a method using resin coating, a method using taping, and the like are known.

As described in Japanese Patent Application Laid-Open No. 6-233950, for example, a molding method is to form a masking material covering a portion to be masked into a shape corresponding to a portion for masking a sheet-like substrate made of plastic or the like. This is a method of performing masking by fixing and bonding this to the non-processed part, and removing the masking material as it is after plating and painting, and repeatedly using it for the next masking again .

[0005] This method is a method that can be performed mainly because it is necessary to provide an electromagnetic shield to protect components and the like housed in an electronic device. In other words, at first, this electromagnetic shield was performed by attaching a metal plate or metal foil to the inside of the housing or case of the electronic device with an adhesive, but such a method requires time and effort, and thus gradually enters the inside of the housing or the like. A method of performing direct plating has been adopted. Therefore, when plating is directly performed on the inside of such a housing or the like, it is necessary to mask a portion that is not plated.

[0006] In the resin coating method, a resin layer is provided in a portion not subjected to surface treatment by a method such as a coating method or a dipping method.
This is used as a masking material, and curing treatment by heating or light irradiation is used according to the type of resin used.

[0007] The taping method is a method in which a masking tape or a masking film is attached to a portion where no surface treatment is performed.

[0008]

However, the conventional masking method has the following problems to be improved.

In the molding method, since a masking mold is temporarily bonded to a masking member with an adhesive, it is necessary to remove the adhesive after the surface treatment. This operation is an obstacle for further improving the working efficiency. Further, depending on the type of the adhesive, the adhesive sticks to or remains on the masked member.

In the resin coating method, a liquid resin is mainly used as a coating material, and the coating is performed by a simple method such as a coating method or an immersion method, so that precise and accurate positioning of the coating is difficult. For example, as shown in FIG. 5, the masking end faces of the coating portions 12a and 12b are not accurately masked due to resin flow. Although it is possible to adopt an advanced coating method that enables precise and accurate positioning, if such a method is adopted, there is a problem that an increase in the number of processes and an increase in cost are unavoidable. .

When the coating resin is thermosetting, the coated resin layer must be cured by heat treatment, and the material to be masked is made of a material such as plastic which does not have heat resistance at the heat treatment temperature. Not applicable if Furthermore, the removal operation after the surface treatment of the resin layer coated for masking,
A method such as dissolution with a solvent is required, and the material of the masking material is required to have resistance to the solvent for masking removal. That is, the material of the masking material is limited.

On the other hand, the taping method is inefficient because it takes time and effort to remove the masking material and the masking material, and it is more difficult and costly especially for those having a complicated three-dimensional shape, and the degree of masking is not sufficient. There was something.

An object of the present invention is to provide a masking method capable of easily performing accurate masking and reusing the masking material, and a masking material used in the method.

[0014]

According to the present invention, there is provided a masking method comprising fixing a masking material on a non-processed surface during surface treatment of a member to be processed, wherein the masking of the member to be processed is performed. It is characterized in that the material is fixed detachably using magnetic force.

Further, the masking material according to the present invention which can be applied to masking of a cylindrical member has a main body having a cylindrical shape, and protrudes from both end surfaces of the main body along the central axis of the cylindrical shape of the main body. A shaft material, which is a masking material that is masked in order to make an end surface region of the cylindrical member at the time of surface treatment of the cylindrical member having a non-processed surface, the shape corresponding to the end region including the end surface of the main body. By being fitted to the end region, the end region is made to be a non-processing surface, and is fixed to the tubular member by magnetic force so as to be detachable.

According to the present invention, the masking material can be easily and accurately mounted on the portion to be treated of the surface-treated member, and the masking material after the surface treatment can be easily removed, and the masking material can be reused. It becomes possible.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings, taking a case where a roller member is used as a member to be processed as a typical example.

FIG. 1 is a perspective view showing a state where both ends of a roller member are masked with a masking material according to the present invention.
FIG. 2 is a plan view of an end on which a masking material is mounted.

This masking material is constituted by combining two members 2a and 2b and 3a and 3b, respectively. That is, these members constitute one masking material by being joined at the fitting connection portions 2c and 3c. Each masking material has a cylindrical structure having a constant inner diameter, and the inner diameter is set according to the outer diameter of the roller portion 1 of the roller member, that is, the hollow inner structure corresponding to the outer shape of the roller portion 1. , It is possible to fit the end portion region of the roller portion 1 with good adhesion.

As described above, the masking material is molded in two parts, and the divided molded members (2a, 2b, 3
a and 3b) are fixed to the end of the roller portion 1 by attracting each other by magnetic force. Further, when the roller member itself is made of a material capable of fixing the masking material by the magnetic force, the magnetic force acting between the constituent material of the roller member and the masking material can be used together.

The masking material is formed from a magnetic material at a necessary portion so that the members (2a and 2b, 3a and 3b) can be united by magnetic force, and at least a magnetic material is used depending on the type of surface treatment using the masking material. It is possible to adopt a configuration in which a coating layer is provided at a portion where the intrusion of the surface treatment agent of the material into the non-surface treatment portion can be effectively prevented. FIG. 1 shows a masking material having a structure in which the entire core material is formed of a magnetic material, and a coating layer is provided on the entire surface of the core material. However, if a predetermined masking state can be obtained by keeping the members 2a and 2b or the members 3a and 3b in close contact with each other at the fitting surfaces, only the portions constituting the fitting surfaces of these members are formed of a magnetic material. May be
The position where the coating layer is provided can also be set as appropriate.

The magnetic coupling between the members can be achieved by magnetizing one of the two surfaces to be coupled with the N pole and the other with the S pole.

As the core material, a material made of a material such as carbon steel, tungsten steel, KS steel, or alnico, which is a hard magnetic material exhibiting the properties of a permanent magnet, can be preferably mentioned.

When the masking material is fixed to the end of the roller portion 1 by using the magnetic force of the magnetic core material, the coating layer forms at least a part of the inner wall surface of the masking material and the roller portion 1 covered by the masking material. It can be formed from a material that provides the required adhesiveness for a predetermined masking effect with the non-treated surface, and its constituent material is selected in consideration of resistance to surface treatment and the like. In order to further improve the adhesion of the masking material to the roller portion 1, for example, it is preferable that the coating layer is formed of a material having elasticity.

Examples of a material for forming a coating layer applicable to plating, electrodeposition coating, and the like in the production of rollers used for development, photosensitivity, heat fixing, transfer, paper feeding, charging, etc. include, for example, tetrafluoride Various resins such as ethylene resin, silicone resin, fluorine resin, polypropylene, polyethylene,
Viton and the like can be mentioned.

In the embodiment shown in FIG.
In the masking materials 2 and 3, the upper flange shaft 4 is exposed from the masking materials 2 and 3 because it is used as a holding portion at the time of chucking for transport or as an electrode during plating and electrodeposition coating. It has become.

The roller portion 1 that has been masked in the fitted state shown in FIG. 1 is immersed in, for example, a plating bath, and plating is performed on an unmasked exposed portion. that time,
Since the masking material is fixed to the non-processed portion (non-plated portion) with good adhesion, the plating solution does not enter the masked portion, and good masking can be performed.

After completion of the surface treatment, the masking materials 2, 3
Is divided into the members 2a, 2b, 3a, and 3b so that it can be easily removed from the roller portion 1 and can be reused in the next surface treatment step.

FIG. 3 shows the roller portion 1 of the roller member.
The other example of the masking material for masking the upper and lower end regions of FIG. FIG. 4 is a perspective view of members 7a and 7b constituting a masking material for upper end masking.

These masking materials are molded in two parts in a structure that can be combined with each other, as in the case shown in FIG. That is, the divided member 6 of the masking material for the upper end masking is made of a core material 6a made of a magnetic material.
Similarly, the member 7 has a structure in which the coating layer 7b is provided on the surface of a core material 7a made of a magnetic material. The masking material for lower end masking is composed of members 8 and 9 and has the same configuration as the masking material for upper end masking except that it has a structure covering up to the shaft 5.

In this masking material, the coating layer is provided effectively, for example, a portion (convex portion) 10a where the coating layer protrudes with an appropriate thickness at a contact portion between the masking material and the roller portion 1. Thus, the structure can effectively prevent the surface treatment agent from entering the non-surface treatment portion.

As shown in FIG. 4, when the members 6 and 7 of the masking material are united, the contact surface 11 is provided with a coating layer to increase the contact load per unit area and enhance the masking effect. Only the outer periphery protrudes in a convex shape 10.
Although not shown, the components 8 and 9 of the masking material for lower end masking have the same structure.

The member to be processed is made of a material such as a metal to which the masking material can be magnetically bonded, and the desired masking effect can be obtained without using the magnetic coupling between the divided members as described above. As long as it is obtained, it may be an integrally molded one instead of the above-described split molding. Further, in the case of division molding, the number of divisions may be three or more according to the structure to be masked.

[0034]

EXAMPLE 1 A masking material having the structure shown in FIG. 1 was divided and molded in a state where an entire surface of a core material was covered with an ethylene tetrafluoride resin layer (layer thickness: 10 to 20 μm). This masking material was fitted and mounted on upper and lower ends of a roller portion 1 (material: Al, size: diameter 10 to 30 mm, length 100 to 400 mm) to perform masking. Roller part 1 thus masked
Was subjected to a surface treatment such as electrodeposition coating. After the surface treatment, the masking material was divided and removed, and a good masking effect was obtained.

Example 2 A masking material having the structure shown in FIG. 3 was divided and molded in a state where the entire surface of the core material was covered with a tetrafluoroethylene resin layer (layer thickness: 20 to 30 μm). These masking materials are applied to the roller part 1 (material: SUS, size: diameter 30 to 40 m).
(m, 400-450 mm in length). The roller portion 1 thus masked was subjected to a surface treatment such as Ni plating and electrostatic coating. After the surface treatment, the masking material was divided and removed, and a good masking effect was obtained.

[0036]

As described above, according to the present invention,
When a predetermined portion of a member such as a roller is subjected to a surface treatment, a portion that is not subjected to the surface treatment is covered with a masking material that can be detachably fixed using a magnetic force, so that simple and accurate masking can be performed. Furthermore, since the masking material is reusable, it can contribute to resource saving.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which both ends of a roller member are masked with a masking material according to the present invention.

FIG. 2 is a plan view of an upper end portion where a masking material is mounted in the state of FIG.

FIG. 3 is a view showing another example of the masking material according to the present invention in a state where upper and lower end regions of a roller portion of the roller member are masked.

FIG. 4 is a perspective view of a member constituting a masking material for upper end masking shown in FIG. 3;

FIG. 5 is a diagram showing a state in which masking has been performed by a conventional masking method using a resin coating method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Roller part 2a, 2b, 6, 7 Component parts of a roller part upper end masking material 3a, 3b, 8, 9 Component parts of a roller part lower end masking material 4 Roller upper end flange shaft 5 Roller lower end flange shaft 6a, 7a, 8a, 9a Core material 6b, 7b, 8b, 9b Coating layer 10 Convex part 11 Contact surface 12a, 12b Masking by resin coating

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 4D073 AA01 BB03 DB03 DB12 DB22 DB33 4D075 AA02 AB03 AD07 AD12 AF01 DA10 DB02 DC18 EA06 EB01 4K024 AA03 AB08 BB06 BC06 FA18 4K027 AA15 AB22 AC18 AD29 4K029 AA04 BB03 BD

Claims (9)

[Claims] 1. A masking method in which a masking material is fixed and covers a non-processed surface during surface treatment of a member to be processed, wherein the fixing of the masking material to the member to be processed is detachable using a magnetic force. A masking method characterized in that the masking method is performed. 2. The masking method according to claim 1, wherein the masking material has a structure in which at least a part of a core material made of a magnetic material is covered with a coating layer. 3. The member to be processed is a cylindrical member having a cylindrical main body, and shaft members protruding along both ends of the main body along a central axis of the cylindrical shape of the main body. The masking material has a shape corresponding to the end region of the main body, and is fitted and installed in the end region, thereby covering at least the end region and covering the end region with a non-processed portion in a surface treatment. The masking method according to claim 1 or 2, wherein 4. The masking method according to claim 3, wherein the cylindrical member is a roller forming member having a cylindrical cylindrical shape. 5. The masking method according to claim 1, wherein the masking material comprises a plurality of members that can be divided into two or more. 6. A cylindrical member having a cylindrical shape at the time of surface treatment of a cylindrical member having a cylindrical body, and shaft members protruding along both ends of the main body along a central axis of the cylindrical shape of the main body. A masking material for masking an end surface region of the member so as to be a non-processed surface. The masking material has a shape corresponding to an end region including an end surface of the main body. A masking material characterized in that the region is a non-processed surface and is fixed to the cylindrical member by a magnetic force so as to be detachable. 7. The masking material according to claim 6, wherein the cylindrical member is a roller forming member having a cylindrical cylindrical shape. 8. The masking material according to claim 6, comprising a plurality of members that can be divided into two or more. 9. The masking material according to claim 6, which has a structure in which at least a part of a core material made of a magnetic material is covered with a coating layer.