JPH05295576A - Continuous degreasing method for metal strips - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a continuous degreasing method that is efficient and can obtain a stable degreasing effect. [Constitution] In a continuous degreasing method in which a metal strip 1 is moistened with a cleaning agent aqueous solution ejected from a spray nozzle 6 and then continuously degreased by brushing with a brush 3.
A continuous degreasing method for the metal strip 1 in which the metal strip 1 is heated so that the temperature at the time of brushing is 40 ° C. or higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous degreasing method for metal strips of copper, copper alloys, iron, etc., for improving the efficiency of degreasing.

[0002]

2. Description of the Related Art Metal strips of copper, copper alloys, iron, etc. are manufactured by rolling, but rolling oil used as working oil during rolling adheres to them, so that degreasing treatment is carried out if necessary. As the degreasing method, immersion degreasing with an alkaline aqueous solution,
Various methods have been used, such as electrolytic degreasing in which an electric current is applied to a metal strip in an aqueous solution as a cathode or an anode, and a method in which the metal strip is wetted with an alkaline aqueous solution and brushed.

Particularly, the method of moistening a metal strip with an alkaline aqueous solution to perform brushing is widely used in the degreasing process of a degreasing facility or a heat treatment facility because the facility management is easy and the cost is low, and the effect is relatively high. .

However, for the purpose of improving productivity, there has been a problem that the degreasing function of the equipment is deteriorated when the speed of passing the metal strip gradually increases.

That is, in the continuous degreasing equipment, the thickness range of the strip to be passed is wide, and it is required to pass the strip having a wide thickness range of 0.1 mm to 1.0 mm, for example. When constructing a degreasing facility, the strip running speed is often higher than that of the conventional facility, and even when using the legacy facility, the strip running speed is often gradually increased. In such a case, the degreasing ability of the equipment may decrease, and the degree of degreasing may vary depending on the type of strip.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to copper, copper alloys,
In continuous alkaline brush degreasing equipment for metal strips such as iron,
An object of the present invention is to provide a degreasing method capable of degreasing stably regardless of the type of strip and the threading conditions.

[0007]

The structure of the present invention for solving the above problems is a continuous degreasing method in which a metal strip is wetted with an aqueous solution of a cleaning agent and continuously brushed for degreasing. Temperature of the strip is 4
This is a continuous degreasing method for metal strips heated to 0 ° C or higher.

An example of the alkaline brush type continuous degreasing equipment will be specifically described with reference to FIG.
The metal strip 1 is passed through a degreasing tank 2 equipped with a brush 3, a backup roll 4, and spray nozzles 6 and 7.

An aqueous cleaning agent solution is jetted from a spray nozzle 7 provided next to the feed roll 5 to wet the surface of the metal strip 1. Strip 1 whose surface is moistened with an aqueous cleaning solution
Is rubbed on the front side with the backup roll 4 while supporting it from the back side, and then rubbed on the back side with the brush 3 while being pressed by the backup roll 4 from above. The spray nozzles 7 and 8 spray a cleaning agent aqueous solution between the strip and the brush to degrease the surface of the strip. However, Fig. 1 shows an upcut, that is, when the direction of travel of the strip and the direction of rotation of the brush are opposite, so the spray is located behind the brush, but when the direction of rotation of the brush is opposite, that is, when the brush is downcut. The spray is located in the front. The metal strip thus degreased is sent out by the feed roll 6.

When a metal strip material (strip) is treated by such a method, the thickness range of the strip to be threaded is wide, for example, 0.1.
It is required to pass a strip having a wide range of thickness from mm to 1.0 mm. When constructing a degreasing facility, the strip running speed is often higher than that of the conventional facility, and when using the legacy facility, the strip running speed is often gradually increased. In such a case, the degreasing ability of the equipment will decrease,
The degree of degreasing may vary depending on the type of strip. When investigating the cause, when the thickness of the strip is thick during brushing or the stripping speed is fast, the temperature of the strip is low, and the degreasing effect of the degreasing liquid and the insufficient brushing effect are the major factors. It was revealed. That is, it is necessary to immerse the strip in the degreasing solution before brushing, or to spray the stripping solution with the degreasing solution beforehand and to raise the temperature of the strip at the time of brushing to 40 ° C or higher. It is important to keep the effect high and stable.

The degreasing liquid usually contains an inorganic chemical such as sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate, etc., and a surfactant as a main component. The effect is high. Usually, the temperature of the degreasing liquid is often in the range of normal temperature to 80 ° C. depending on the purpose. However, when the sheet passing speed is increased, the temperature of the strip does not rise to the temperature of the degreasing liquid during brushing, and the degreasing effect is reduced. Also, when the thickness of the strip is large, the temperature of the strip is unlikely to rise and the degreasing effect is reduced. Therefore, taking into account the stripping speed and plate thickness, the degreasing effect can be obtained by preheating the strips with a degreasing liquid so that the temperature of the strips reaches the specified degreasing liquid temperature during brushing instead of using the dipping method or spraying method. Can be higher.

[0012]

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples.

A strip of copper having a width of 600 mm and a thickness of 0.1 to 0.8 mm is passed through the strip of alkaline brush degreasing equipment shown in FIG. Was measured. At that time, the flow rate of the preliminary spray of the degreasing liquid and the distance between the preliminary spray and the brush were adjusted to control the temperature of the strip during brushing.

Table 1 shows the specific conditions and the results.

[0015]

[Table 1]

[0016]

As described above, according to the method of the present invention, the continuous degreasing method can be efficiently performed, and a good and stable degreasing effect can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a specific example for carrying out the present invention.

[Explanation of symbols] 1 metal strip 2 degreasing tank 3 brush 4 backup roll 5,6 feed roll 7,8 spray nozzle

Claims (1)

[Claims] 1. In a continuous degreasing method in which a metal strip is moistened with a cleaning solution and brushed continuously to degrease, the temperature of the strip at the time of brushing is 40 ° C.
A continuous degreasing method for a metal strip, which is characterized by being heated above.