JPH0759760B2 - Ultra-thin metal strip cleaning equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for continuously cleaning an ultrathin metal strip such as a foil produced by cold rolling or the like.

(Prior Art) Plates made of stainless steel, high alloys, titanium, etc. are expanding their applications to electronic parts as ultra-thin materials and foils. These materials are often manufactured as strips by cold rolling, and since rolling oil adheres to the surface in the cold rolled state,
Needs to be washed and made into a product. In addition, it is necessary to wash when performing heat treatment such as annealing after cold rolling.

Conventionally, as a method for cleaning a metal strip such as a steel strip, a brushing method in which a strip is sprayed while spraying an alkali cleaning solution or by immersing the strip in the cleaning solution, an electrolytic method in which an electrolysis is performed in an alkali cleaning solution, and degreasing with an organic solvent The solvent method and the like are adopted.

(Problems to be solved by the invention) When cleaning an ultra-thin metal strip, when the brushing method is performed, the strip is bent, creased, and squeezed. Defects in brushing are applied so that these defects do not occur. If it is reduced, cleaning will be insufficient. In addition, when the electrolysis method is used, there is a problem that the pass line of the strip fluctuates up and down to cause uneven cleaning, or the strip comes into contact with the electrodes to cause scratches and seizure. In addition, the solvent method has become obsolete due to the harmful nature of organic solvents.

The present invention, when cleaning and removing deposits such as rolling oil of ultra-thin metal strips, the strips are not bent, and defects such as scratches and uneven cleaning are not generated, and stable and reliable cleaning is performed, Moreover, it is an object of the present invention to provide a cleaning device that does not cause environmental pollution.

(Means for Solving the Problem) The present invention relates to a metal strip cleaning apparatus including a cleaning tank 1, an inlet sink roll 2, an outlet sink roll 3, an anode 5, a cathode 4 and a strip holder 6. The inlet-side sink roll 2 and the outlet-side sink roll 3 are provided in the cleaning tank such that their axes are perpendicular to the transport direction of the strip and the roll lower surfaces 22 and 23 are below the surface of the cleaning liquid. And cathode 4
Are respectively arranged with upper electrodes 41, 51 and lower electrodes 42, 52 in order along the conveying direction of the strip S, and the upper electrodes 41, 51 and the lower electrodes 42, 52 are inclined with respect to the pass line of the strip S. There is a mechanism for adjusting the angle, and the gap between the upper electrode 41 and the lower electrode 42 on the entrance side is widened toward the end along the transport direction of the strip S,
The upper electrode 51 and the lower electrode 52 on the output side are arranged so that the gap between them is narrowed, and the strip holder is provided between the anode 5 and the cathode 4 and includes an upper nozzle 61 and a lower nozzle 62. Lower nozzle
The cleaning device for ultra-thin metal strips is characterized in that 62 is provided to face each other with a pass line in between.

(Operation) Hereinafter, the present invention will be described with reference to specific examples.

FIG. 1 is a diagram showing a cross section of a state in which an ultrathin metal strip S is being transported and cleaned from left to right in the drawing. The cleaning device of the present invention comprises a cleaning tank 1, an inlet side sink roll 2, an outlet side sink roll 3, an anode 4, a cathode 5 and a strip plate holding device 6. The cleaning liquid C is stored in the cleaning tank 1, and the strip S is transported to the cleaning liquid C. The inlet side sink roll 2 and the outlet side sink roll 3 have axes 21, 31 (perpendicular to the paper surface in FIG. 1) at right angles to the transport direction of the strip S, and roll lower surfaces 22, 32 for the cleaning liquid C. It is provided in the cleaning tank 1 so as to be below the liquid surface. Anode 4 and cathode 5
Are arranged in order along the transport direction of the strip S, the anode 4 is provided with an upper electrode 41 and a lower electrode 42, and the cathode 5 is provided with an upper electrode 51 and a lower electrode 52, respectively, and the upper electrode 41, the lower electrode 42 and the upper electrode are provided. 51 and the lower electrode 52 are the pass lines P of the strip S connecting the roll lower surfaces 22 and 32 of the inlet side sink roll 2 and the outlet side sink roll 3, respectively.
It is installed on the top and bottom with a space between them. The anode 4 and the cathode 5
Are respectively arranged with upper electrodes 41, 51 and lower electrodes 42, 52 in order along the conveying direction of the strip S, and the upper electrodes 41, 51 and the lower electrodes 42, 52 are inclined with respect to the pass line of the strip S. There is a mechanism for adjusting the angle θ, the distance between the upper electrode 41 and the lower electrode 42 on the inlet side is widened toward the end along the transport direction of the strip S, and the distance between the upper electrode 51 and the lower electrode 52 on the outlet side. Are arranged to narrow. The strip holder 6 is arranged between the anode 4 and the cathode 5 and has an upper nozzle 61 and a lower nozzle 62.
62 are provided to face each other with the pass line P in between.

Although FIG. 1 shows an example in which one set of the anode 4 and the cathode 5 is arranged, two sets or three or more sets may be arranged if necessary.

In FIG. 1, the strip S enters the cleaning tank 1 through the deflector roll 11 on the inlet side, is bent by the sink roll 2 on the inlet side, is conveyed on the pass line P, is bent by the sink roll 3 on the outlet side, and is discharged on the outlet side. It is discharged from the cleaning tank 1 through the deflector roll 12. Since the cleaning liquid C is contained in the cleaning tank 1 and the roll lower surfaces 22 and 32 of the respective sink rolls are located below the liquid surface, the strip plate S is immersed in the cleaning liquid C and passes through the pass line P.
Be transported. The strip S is arranged on the pass line P between the upper electrode 41 and the lower electrode 42 of the anode 4, between the upper nozzle 61 and the lower nozzle 62 of the strip holding device 6, and the upper electrode 51 and the lower electrode of the cathode 5. 52
Pass through in order.

The anode 4 and the cathode 5 are connected to a DC power source 9, and current flows from the upper electrode 41 and the lower electrode 42 of the anode 4 through the cleaning liquid C, the strip plate S, and the cleaning liquid C to the upper electrode 51 and the lower electrode 5 of the cathode 5. It flows to the electrode 52. For this reason, hydrogen gas and oxygen gas are generated from the surface of the strip plate S facing each electrode, and dirt such as rolling oil adhering to the strip plate S is removed by the action of the fine bubbles of each gas. Since the polarity of the strip S is positive at the end in order to prevent foreign matter from adhering to the surface, the electrodes are arranged so that the cathode 5 is at the end. An electrolyte aqueous solution such as sodium hydroxide is used as the cleaning liquid.

The upper electrodes 41, 51 are preferably in a grid pattern. In the case of the grid shape, the gas generated by electrolysis rises through the grid openings, which is effective in preventing uneven cleaning in the surface of the electrode. Further, in order to prevent the gas from accumulating on the lower surface of the strip plate, as shown in FIG.
8 is preferably provided between the strip S and the lower electrodes 42 and 52.

An upper nozzle 61 and a lower nozzle 62 are provided in the strip holding device 6 so as to face each other, and the cleaning liquid C is jetted toward the strip S. First
In the example of the figure, two upper nozzles 61a, 6a in the conveyance direction of the strip S are provided.
1b and two lower nozzles 62a, 62b are provided, both of which are slit nozzles long in the width direction of the strip S, and the upper nozzles
61a, 61b and lower nozzles 62a, 62b are provided so as to be inclined in a direction in which they approach each other. Further, the positions and angles of the cleaning liquid sprayed from the upper nozzle 61a and the lower nozzle 62a and the cleaning liquid sprayed from the upper nozzle 61b and the lower nozzle 62b are adjusted so that they match on the pass line P. .

The strip S is always maintained and conveyed on the pass line P by the pressure of the cleaning liquid ejected from the upper nozzle 61 and the lower nozzle 62 provided facing each other. Therefore, the distance between the strip plate S and each of the electrodes 41, 42, 51, 52 is such that the distance between the upper electrode 41 and the lower electrode 42 on the inlet side is a divergent shape along the transport direction of the strip plate, and the distance between the electrodes is 42. Since the space between the upper electrode 51 and the lower electrode 52 on the side is narrowed, it is possible to prevent discoloration or uneven cleaning due to an excessive current flowing through the strip S. Further, since the strip plate S has no possibility of contacting the electrodes,
No scratches or seizures will occur. Furthermore, since the strip holder 6 blocks the current flowing directly from the anode to the cathode, the current efficiency effective for cleaning is improved.

The main part of another example of the device of the present invention is shown in FIG. The upper electrode 41 and the lower electrode 42 of the anode 4 are rotatably held by pins 47 on columns 43 provided at positions on both sides of the strip S in the transport direction in the cleaning tank 1, and the strip S of the strip S is also held. Pins 47 rotatably hold nuts 45 and 46 screwed into bolts 44 provided on both sides in the transport direction. Nut 45 and nut 46
Are threaded in opposite directions. The upper electrode 51 and the lower electrode 52 of the cathode 5 are similarly held by the support column 53 and the bolt 54. Support 4 for bolts 44 and 54
3, 53 are provided on the strip holding device 6 side. Bolt 44
When the bolt 54 is turned, the nut 45 and the nut 46, and the nut 55 and the nut 56 are moved in opposite directions to adjust the tilt angles θ ₁ and θ _{2 of the} electrodes.

By inclining each electrode as described above so that the distance between the strip plate and each electrode becomes wider as the anode and the cathode approach each other, and adjusting the inclination angles θ ₁ and θ ₂ to appropriate angles,
It is possible to prevent discoloration and uneven cleaning due to an excessive current flowing through the strip S.

(Example) By incorporating the device of the present invention into a continuous bright annealing line for metal foil coils, a SUS304 stainless steel foil coil having a plate thickness of 0.01 mm and a width of 370 mm was passed through at a line speed of 25 m / min to perform cleaning and annealing. It went continuously. The cleaning device has a distance between the inlet side sink roll 2 and the outlet side sink roll 3 of 2.7 m, two pairs of the anode 4 and the cathode 5 are provided, and the length of each electrode in the belt plate transport direction is 450 mm.
The inclination angles θ ₁ and θ ₂ of each electrode are set to 10 °, and a strip holding device as shown in FIG. 1 is provided between the anode 4 and the cathode 5.
The cleaning liquid was sprayed onto the strip S at a pressure of 3.0 kg / cm ² . An aqueous solution of sodium hydroxide having a concentration of 3 vol% was used as the cleaning liquid.

The strip S after washing had no defects such as a bent waist, a crescent moon, squeezing and scratches, and no discoloration was observed. After annealing, the strip S had no discoloration due to poor cleaning or uneven cleaning, and a beautiful surface was obtained.

(Effects of the Invention) With the device of the present invention, it has become possible to continuously clean ultra-thin metal strips such as metal foils, which have been difficult to clean in the past, and exert a great effect in removing rolling oil of rolled materials. To do. Further, by incorporating the apparatus of the present invention into an annealing line for rolled materials, continuous cleaning annealing of ultrathin metal strips is configured, and it becomes possible to stably supply ultrathin metal strips such as foils with high quality.

[Brief description of drawings]

1 and 2 are diagrams showing specific examples of the device of the present invention. 1 ... Cleaning tank, 2 ... Inlet side sink roll, 3 ... Outlet side sink roll, 4 ... Anode, 5 ... Cathode, 6 ... Strip holder, 7, 8 ... Jet nozzle, 9 ... … DC power supply, 11 ……
Entry side deflector roll, 12 …… Exit side deflector roll, 21 …… Axis, 22 …… Roll lower surface, 31 …… Axis, 32 …… Roll lower surface, 41 …… Upper electrode, 42 …… Lower electrode, 43 …… Props,
44 …… Bolts, 45, 46 …… Nuts, 47 …… Pins, 51 ……
Upper electrode, 52 ...... Lower electrode, 53 ...... Posts, 54 ...... Volts, 5
5, 56 …… Nut, 61, 61a, 61b …… Upper nozzle, 62, 62
a, 62b ... Lower nozzle, C ... Cleaning liquid, S ... Strip plate, P ...
…Path line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Yoshimori 46-59, Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture Nippon Steel Co., Ltd. Machinery & Plant Division (56) Reference JP-A-61-207595 (JP, A) Actual development Sho 63-39179 (JP, U) Japanese patent Sho 56-43320 (JP, B2) Japanese public Sho 61-22040 (JP, B2)

Claims (1)

[Claims] 1. A metal strip cleaning device comprising a cleaning tank, an inlet side sink roll, an outlet side sink roll, an anode, a cathode and a strip plate holding device, wherein the inlet side sink roll and the outlet side sink roll have axes. It is provided in the cleaning tank at a right angle to the conveying direction of the strip and the lower surface of the roll is below the surface of the cleaning liquid, and the anode and the cathode are provided with upper and lower electrodes, respectively, along the conveying direction of the strip. The upper electrode and the lower electrode have a mechanism for adjusting the inclination angle of the strip with respect to the pass line of the strip, and the distance between the upper electrode and the lower electrode on the entrance side is a divergent shape along the transport direction of the strip. The upper electrode and the lower electrode on the output side are arranged so that the distance between them is narrowed, and the strip holder is provided between the anode and the cathode and is provided with an upper nozzle and a lower nozzle, and the upper nozzle and the lower nozzle pass. It should be installed facing up and down with a line in between. And ultrathin metal band plate cleaning device, characterized in that are.