JP2003190873A - Rubber roller coating method and coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating method and an apparatus which can form a uniform, smooth and relatively thin coating film in coating on an outer peripheral surface of a rubber roller and are easy to carry out. . A coating method for forming a coating film on the outer peripheral surface of a rubber roller includes a heating step of heating the outer peripheral surface of the rubber roller with a near-infrared heater, and a paint adhering step of applying a paint to the outer peripheral surface. Immediately after performing the heating step and / or in parallel with the heating step, the paint applying step is performed. In a coating apparatus for forming a coating film on the outer peripheral surface of a rubber roller, a supporting means for detachably and rotatably supporting the rubber roller, a rotating means for rotating the rubber roller, and heating the outer peripheral surface of the rubber roller It has a near-infrared heater, a paint adhering means for adhering paint on the outer peripheral surface, and a control means for controlling the rotating means, the near-infrared heater and the paint adhering means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and apparatus for coating a water-based coating on the outer peripheral surface of a rubber roller to obtain a thin and smooth coating film.

[0002]

2. Description of the Related Art In Japanese Patent Laid-Open No. 5-50022, heating an object to be coated at 70 to 150.degree. C. prior to applying a coating material enables thick coating and formation of a good coating film.
Next, it is disclosed that the residual heat from the article to be coated accelerates the drying of the coating material.

On the other hand, in a paper-conveying rubber roller of a printer or the like, a fluororesin is sometimes applied to the outer peripheral surface as a measure for preventing contamination during use. In such a case, it is necessary to apply an aqueous paint on the outer peripheral surface of the rubber roller to obtain a stable thin and smooth coating film. However, it is difficult to satisfactorily form a coating film made of a water-based paint on the outer peripheral surface of the rubber roller, and it has been difficult to cope with the conventional techniques including the technique described in the above publication. Under these circumstances, it has been desired to develop a coating technique capable of forming a uniform and smooth coating film in coating using a rubber roller with an aqueous coating material.

Further, according to Japanese Patent Laid-Open No. 5-50022, a method of heating Joule heat by putting it in a heating furnace or directly energizing it is said to be a method for heating the article to be coated. However, regarding the method of directly applying an electric current to the article to be heated, it is not impossible to perform pre-coating heating until just before coating by installing these energizing means in the coating apparatus, but the article to be coated is It is not practical in the case of a copper-based metal or aluminum having a low electric resistance, or in the case of an electric insulator such as rubber. In addition, in the heating by the heating furnace, the temperature of the article to be coated is inevitably lowered while being taken out of the heating furnace and conveyed to the coating means. Although it is possible to use some kind of heat retaining means during transportation, it is not rational in view of the fact that the equipment, control, etc. become complicated when automating the conveying means, and it is necessary to install heat retaining and heating means. I can not say.

[0005]

That is, the present invention is capable of forming a uniform, smooth and relatively thin coating film when coating a rubber roller outer peripheral surface with a paint, especially a water-based paint. It is an object of the present invention to provide a coating method that is particularly easy to carry out. It also provides the coating device.

[0006]

The present invention provides a method for coating a rubber roller for forming a coating film on the outer peripheral surface of a rubber roller, wherein a heating step of heating the outer peripheral surface of the rubber roller with a near infrared heater, A coating step for coating the outer peripheral surface with a coating material, wherein the coating material coating step is performed immediately after performing the heating step and / or in parallel with the heating step. It is a construction method.

This method may further include a post-heating step of heating the rubber roller with the near-infrared heater after the coating material attaching step.

This method can be suitably applied when the paint is a water-based paint.

In the coating material attaching step, it is preferable to apply the coating material by a spray coating method.

The present invention also provides, in a rubber roller coating apparatus for forming a coating film on the outer peripheral surface of a rubber roller, a supporting means for detachably and rotatably supporting the rubber roller, and the rubber roller for rotation. Rotating means to
A near-infrared heater for heating the outer peripheral surface of the rubber roller; a paint adhering means for adhering paint to the outer peripheral surface; and a control means for controlling the rotating means, the near-infrared heater and the paint adhering means. This is a rubber roller coating device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic arrangement of main components of the coating apparatus of the present invention. FIG. 2 shows the positional relationship between the rubber roller and the near infrared heater.

In the present invention, the object to be coated is the rubber roller 3
Is. A well-known thing can be used as a rubber roller. A typical rubber roller is one in which a rubber layer is provided on the peripheral surface of a cylindrical core shaft so as to form a peripheral surface. As an example, there may be mentioned one in which a silicone rubber layer 5 is adhered around the core metal so that both ends of the core metal 4 made of aluminum are exposed.

According to the present invention, a thin and uniform coating film can be formed on the outer peripheral surface of the rubber layer.

The present invention is preferably applied when the paint for forming the coating film is an aqueous paint, but the present invention is also applicable to other paints. The water-based paint is a paint containing water as a dispersion medium or a solvent, and examples thereof include a water-dispersed fluorine resin.

As the rubber material constituting the rubber layer, for example, liquid two-liquid mixed thermosetting silicone rubber can be used, and as the water-based paint, for example, FEP (fluorinated ethylene propylene) 50 to 55 mass% and An aqueous dispersion containing 2-3% surfactant can be used.

The heating temperature is preferably 40 ° C. or higher and lower than 70 ° C. If the paint adheres at less than 40 ° C, the drying tends to become non-uniform during the drying process, uneven density is likely to occur in the film-like paint, and cracking is likely to occur in the part where the density is reduced after drying. It is disadvantageous in that respect. 70
It is disadvantageous in that the drying tends to be non-uniform even at temperatures above ℃. Also, since the paint is water-based, it becomes difficult to obtain a good coating film due to boiling at high temperature or evaporation of water before coating. It is disadvantageous in that it tends to occur.

With respect to the timing of performing the heating step of heating the outer peripheral surface of the rubber roller with a near infrared heater and the paint adhering step of adhering the paint to the outer peripheral surface, FIG.
Some patterns are illustrated in. FIG. 3A shows a pattern in which the coating material attaching step is performed immediately after the heating step, and FIG. 3B shows a pattern in which the coating material attaching step is performed in parallel with the heating step. In (c), a pattern is shown in which the coating material is applied in parallel with the heating step and immediately after the heating step, as well as in a part of the heating step and after the heating is completed. . The term “immediately after the heating step” means that the outer peripheral surface of the rubber roller does not fall below a desired temperature.

Further, when there is a post heating step of heating the rubber roller after the coating material attaching step, for example, as shown in FIG.
After the coating process of (a) to (c), the rubber roller may be heated by a near infrared heater. After heating,
This is appropriately performed for drying and firing the paint attached to the roller.

When the rubber roller is rotated in the heating step and the coating material attaching step, the entire surface of the outer peripheral surface of the rubber roller can be easily heated and the coating material can be attached.

Management of each of these steps can be automated by an automatic control device. For example, the time pattern as described above can be stored in a control means such as a sequencer or a computer, and the on / off of the paint adhering means such as a near infrared heater or a spray device can be controlled.
Instead of setting the time of each step in advance, it is possible to provide a detecting means for detecting the surface temperature of the rubber roller, the thickness of the coating film, etc., and control the ON / OFF by these signals.

[0022]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

An atomizing spray device 2 was used as a paint adhering means, which was installed at a predetermined position facing the outer peripheral surface of the rubber roller as shown in FIG. The paint is introduced from the water-based paint holding tank 6 into the atomizing spray device by a conduit. In addition, the near-infrared heater 1 is provided as a heating means in the vicinity of the paint adhesion position of the rubber roller 3 which is the object to be coated.
Was installed. This heater uses a rod-shaped halogen lamp that emits visible light having a wavelength of near-infrared region as a heating source, and has a reflector having a reflector for focusing the emitted heat energy over the entire length of the rubber roller. Shaped near infrared heater. The heating means has a length over the entire length of the article to be coated (rubber roller).

With respect to the coating apparatus, a focus type near infrared heater is used as the heating means, and by arranging the rubber roller surface in the vicinity of the focal point, the temperature of the coating surface can be raised in a short time, and the coating material adhering means. It is possible to simplify and downsize by devising the arrangement of and.

The rubber roller supporting means (not shown) is a means for supporting the rubber roller in a removable and rotatable manner. Here, the supporting means itself is provided with a rotating means for rotationally driving the rubber roller. The rubber roller can be rotated at a desired number of rotations at each stage of heating and coating treatment.

When the outer peripheral surface of the rubber roller is coated with a water-based paint, the rubber roller set on the supporting means is rotated and at the same time the near-infrared heater 1 as the heating means is operated (lighted). The outer peripheral surface of the rubber roller was heated to 40 to 70 ° C. By adopting the focus type near infrared heater as the heating means, only the coated surface can be heated in a short time. The rotation (rotation) of the rubber roller was clockwise in FIG. 1, and the near-infrared heater was arranged on the upstream side in the rotation direction and the paint adhering means was arranged on the downstream side.

At the end of heating, the near infrared heater is turned off. At this time, the temperature uniformity of the rubber roller outer peripheral surface is
It is possible to keep the set temperature ± 3 ° C over the entire area with respect to the desired temperature. The method of setting the desired temperature was set by combining the operating time of the near infrared heater and the output adjustment function.

Almost at the end of heating the rubber roller, a spray as a paint adhering means was operated to adhere the water-based paint to the outer peripheral surface of the rubber roller. That is, the atomizing spray 2 arranged substantially orthogonal to the rubber roller and the near-infrared heater is operated immediately after heating the rubber roller, and is moved in the axial direction of the rubber roller over the entire length of the object to be coated (rubber roller). The water-based paint was applied by running. When the coating material finishes, the residual heat of the rubber roller evaporates and dries the coating material, so even if the rotation of the coated object is stopped at the same time as the coating is completed, the coating material does not drip down and the next step Transport was possible. The thickness of the coating film was adjusted to be 9 ± 1 μm by the function of spraying.

The time required for spraying was the time for finishing the adhesion of the paint while the set temperature ± 3 ° C. of the coated surface of the rubber roller was maintained.

A series of these operations are managed by a control device that automatically advances in a preset operation sequence.

The reason why the atomizing spray is arranged substantially orthogonal to the rubber roller and the near-infrared heater is a device for preventing spray droplets from being applied to the near-infrared heater.

Next, room temperature drying was performed to uniformly dry the applied coating material by the residual heat from the rubber roller.

As a result, it was possible to stably obtain a rubber roller having a coating film thickness of 9 ± 1 μm and a coating film surface roughness of 1 μm.

Although the example in which the coating material is applied immediately after the completion of heating has been described above, it is also possible to perform the heating for heating or keeping the temperature of the rubber roller during the application of the coating material, or for drying after the application of the coating material. For example, in the case of coating a long rubber roller, a heating means for heating only a part of the lengthwise direction of the roller is used instead of or in combination with the heating means for the entire length of the roller. It is possible to adopt a mode in which the heating means is arranged at a position preceding to, and the paint adhering means and the heating means travel together. With such a configuration, it is possible to prevent a decrease in the roller surface temperature. When heating is performed by operating the heating means after the paint attaching step, it can be used as a baking means in the case of using a water-based paint that requires baking, in addition to heating for drying.

[0035]

Therefore, the present invention can form a uniform and smooth relatively thin coating film on the outer peripheral surface of a rubber roller, especially when an aqueous paint is used, and is particularly easy to carry out. It has become possible to provide a coating method and a coating device.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an arrangement of main constituent elements of a coating apparatus of the present invention.

FIG. 2 is a longitudinal view of a rubber roller showing a positional relationship between the rubber roller and a heating unit.

FIG. 3 is a schematic diagram for explaining the timing of performing a heating process and a paint attaching process.

[Explanation of symbols]

1: Near infrared heater (heating means) 2: Atomization type spray (paint adhesion means) 3: Rubber roller 4: Aluminum core 5: Silicone rubber layer 6: Paint tank

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // C08L 21:00 C08L 21:00 (72) Inventor Masayuki Shinoda 1888-2 Kanzaki, Kashizaki-cho, Inashiki-gun, Ibaraki Prefecture Canon Chemical In-house (72) Inventor Keitaro Yamaguchi 1888-2 Kukizaki, Kashizaki-cho, Inashiki-gun, Ibaraki Canon F-Term (Reference) 4D075 AA01 AA68 BB14Y BB14Z BB23Y BB24Z BB26Z BB37Y BB37Z CA48 DA10 DA15 DA20 DB35 DB54 DC16 DC21 EA06 EA07 EA10 EB16 4F006 AA04 AB19 BA11 CA08 DA04 EA05 4F035 AA03 CA05 CB05 CC04 CF00 4F042 AA03 AA06 AA13 DA09 DB20 DF32

Claims (5)

[Claims] 1. A method for coating a rubber roller for forming a coating film on the outer peripheral surface of a rubber roller, wherein a heating step of heating the outer peripheral surface of the rubber roller with a near infrared heater and a coating material for adhering the coating material to the outer peripheral surface. A coating method for a rubber roller, which has an adhesion step, and performs the coating material adhesion step immediately after performing the heating step and / or in parallel with the heating step. 2. The method according to claim 1, further comprising a post-heating step of heating the rubber roller with the near-infrared heater after the coating material applying step. 3. The method according to claim 1, wherein the paint is a water-based paint. 4. The method according to claim 3, wherein the paint is applied by a spray method in the paint applying step. 5. A rubber roller coating apparatus for forming a coating film on the outer peripheral surface of a rubber roller, wherein the rubber roller is detachably and rotatably supported, and a rotating means for rotating the rubber roller. And a near-infrared heater for heating the outer peripheral surface of the rubber roller, a paint adhering means for adhering paint to the outer peripheral surface, and a control means for controlling the rotating means, the near-infrared heater and the paint adhering means. Characteristic rubber roller coating device.