JPS6160160B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cleaning guide rollers used in manufacturing equipment that applies paint, etc. to elongated objects such as electric wires and tapes, and then dries and bakes them.

In particular, the present invention relates to a method for cleaning deposits such as tar, oil, dust, etc. on a guide roller whose base material is made of metal or conductive ceramic by using electrolysis.

Guide rollers are always used when coating and baking paint on long electric wires and tapes, but as these guide rollers are used for a long time, oil, tar, or dust gets stuck in their grooves. ,
This has caused not only damage to the surface of electric wires and tapes, but also a deterioration of required properties.
In addition, as the shaft portion that has the function of rotating the guide rollers has been used for a long time, dust has become mixed with oil and grease, making the rotation of the guide rollers heavier, which has become a cause of wire elongation. Therefore, the portion of the guide roller that comes into contact with the shaft portion needs to be cleaned at regular intervals.

As can be seen from the above, cleaning of pass lines, especially cleaning of guide rollers, in manufacturing long products is indispensable and important for maintaining the quality of long products.

However, the conventional guide roller cleaning method is
immersed in organic solvent or alkaline liquid,
This has been done by swelling, dissolving, or decomposing the deposits, but when an organic solvent is used, the organic solvent deteriorates in a short period of time, reducing the cleaning ability. Furthermore, since organic solvents are handled, special care must be taken in terms of occupational hygiene, which requires the installation of large-scale equipment such as local exhaust ventilation.
In the case of cleaning with alkali, the deposits are removed by decomposing the deposits and reducing the adhesion to the substrate, but it takes time to decompose the deposits, and acid is used to treat the alkaline solution. There were also problems in terms of cost, such as the need for neutralization treatment. Although cleaning the grooves of the guide rollers is particularly important, it has been difficult.

As a result of intensive research, the inventors of the present invention have found that a holder impregnated with a conductive liquid is installed in the groove of the guide roller, an electrode is placed on top of the holder, and the groove is electrolytically cleaned. We have discovered that cleaning can be done easily and at low cost.

The present invention will be explained in detail below.

Conductive guide rollers used in the manufacture of long electric wires and tapes are mainly made of aluminum, iron, brass, stainless steel, or ceramic. Note that guide rollers made of alloys made of various metals are also often used.

Conventionally, when electrolytic cleaning is applied to these metals, iron-based metals have not been applied because the hydrogen generated during electrolysis causes hydrogen embrittlement. Furthermore, in the case of amphoteric metals such as aluminum, elution may occur even when connected to an aluminum cathode, so the application of electrolytic cleaning methods has not progressed. However, when somewhat mild conditions are applied to the object to be treated in electrolytic cleaning, hydrogen embrittlement hardly occurs in iron-based metals, and there is no adverse effect on the guide roller after cleaning. It was also found that by repeatedly removing deposits by washing, it can be used semi-permanently. It was also found that for non-ferrous metals, mainly aluminum and copper, hydrogen embrittlement is negligible, and the effect of electrolytic cleaning is extremely large. For amphoteric metal aluminum, slight elution occurs during electrolytic cleaning. However, when the surface is lightly rubbed to remove deposits such as oil and grease tar that have surfaced on the aluminum surface after electrolytic cleaning, the irregularities on the surface are only crushed, and there is no problem in actual use. It has not caused any problems. Moreover, even after repeated electrolytic cleaning, the product did not become unusable due to metal elution. Rather, it is more effective to perform electrolytic cleaning when the deposits can be removed relatively easily, rather than to perform electrolytic cleaning after the deposits have adhered to the conductor and cannot be removed easily.

The conductive liquid used for electrolytic cleaning may be an aqueous solution in which various salts or acids are dissolved in water. For example, carbonate, phosphate, common salt, hydrochloric acid, sulfuric acid, and nitric acid can be used. Among these, caustic soda, sodium carbonate, sodium bicarbonate, sodium silicate, etc. are even more effective because they have the ability to degrease fats and oils and decompose deposits simply by immersion. A current density of 0.1 to 40 mA/mm ² is sufficient during electrolytic cleaning, but it can be changed depending on the degree of adhesion of deposits to the guide roller.

In the present invention, in electrolytic cleaning, a current in which alternating current and alternating current are superimposed can be used at the same time as direct current. In this case, it has been found that oil, fat, tar, and other deposits adhering to the guide roller can be removed better, and hydrogen embrittlement of iron-based metals or dissolution of amphoteric metals does not pose any problems.

As for other conditions in this electrolytic cleaning, if the temperature of the conductive liquid is about 30° C. to 80° C., which is higher than room temperature, the effect can be improved in a shorter time and under gentle electrolytic conditions.

When electrolytically cleaning the grooves of a grooved guide roller, spread gauze or other cloth or paper that will hold the electrolyte in the grooves, soak the conductive liquid, and then place a bare wire that will serve as a counter electrode on top of it. Then, a voltage can be applied using this as an anode and the guide roller body as a cathode. This method also includes a method of removing deposits from the groove by gently rubbing the groove after removing the electrode and the electrolyte holder such as cloth after a certain period of energization.

Next, the present invention will be explained using the drawings.

FIG. 1 shows the case where the groove portion of the guide roller is electrolytically cleaned, where 1 is the guide roller and 2 is a holder made of cloth or the like to prevent the conductive liquid from flowing away. 3 indicates a counter electrode.

Next, the present invention will be explained using examples.

Example (1) To clean only the groove of a brass guide roller (diameter 5 cm, thickness 10 mm) that is contaminated with tar, oil, fat, dust, etc., gauze is wrapped around the groove three times, and a 2 mm diameter cloth is wrapped around the groove. A stainless steel wire was wrapped once, and electrolytic cleaning was performed for 5 minutes at a current density of 20 mA/mm ² using the guide roller as a cathode and the stainless steel wire as an anode. A 1% aqueous sodium bicarbonate solution was used as the conductive liquid that permeated the gauze. After electrolytic cleaning, the deposits that had lost their adhesive strength and floated to the groove surface were gently rubbed, then washed with water and dried. As a result, a guide roller with clean grooves was obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a method of electrolytically cleaning the groove portion of a conductive guide roller according to the present invention. 1... Guide roller, 2... Holding body, 3...
Counter electrode.

Claims (1)

[Claims] 1. Guide roller cleaning characterized by installing a holder impregnated with a conductive liquid in the groove of a guide roller made of metal or conductive ceramic, placing an electrode on it, and electrolytically cleaning the groove. Method.