JPS6067698A - Web cooling method - Google Patents

Abstract

PURPOSE:To provide an excellent cooling method enabled in extremely stable electrolytic treatment even in high current density treatment, by forming the flow-down liquid film of a cooling liquid to the surface of a web. CONSTITUTION:A metal web 31 is introduced into an anodic electrolytic cell 33 and succeedingly introduced into a cathodic electrolytic cell 36 to be transferred out of the cell 36. In this case, electrodes 38-41 are respectively arranged in the cell 33, 36 so as to be opposed to the web 36 running while wound around drum rollers 42, 43 and the web 31 running while issued out of tanks between the tanks 33, 36 is conveyed so as to form a falling gradient of 10 deg. or less in the advance direction of the web 31. During this time, an electrolytic liquid, which is sent and supplied from spray nozzles 54, 55 arranged to both upper and lower sides of the web 31 by a supply pump 56, is sprayed to the web 3. By this method, a flow-down liquid film is formed to the surface of the web 31 to perform cooling. Therefore, cooling is enabled over the entire surface of the web 31 uniformly with good efficiency and electrolytic treatment can be stably performed even at high current density Ds=100-150A/mm.<2>.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the production of recording materials such as photographic films, photoengraving materials, magnetic recording materials such as magnetic recording tapes, etc. That's what it means.

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Examples of methods for cooling the web include a method of blowing cooling air, a method of bringing the web into contact with a low-temperature roll, and a method of spraying a cooling liquid. The present invention proposes an improvement in the method of cooling a web using a cooling liquid. In the following, the invention will be described in detail, taking as an example the case of cooling in continuous electrolytic treatment of a metal web.

Continuous electrolytic treatments of metal webs using the liquid power feeding method include, for example, plating treatment, electrolytic roughening treatment, and electrolytic elatin treatment. The liquid power supply method is a method of indirectly supplying power to a metal web via an electrolytic solution, and it is possible to supply a large current extremely stably. However, if the cross-sectional current density Ds (hereinafter simply referred to as rDsJ) of the current flowing in the metal web between the electrolyzers is high, heating due to Joule heat may occur, causing thermal distortion in the metal web or causing thin wall thickness. Webs have flaws such as melting. If the processing speed is high, it will be a high current density process, so D
As s increases, these defects are more likely to occur. It is an object of the present invention to provide an efficient method for cooling a metal web that eliminates these deficiencies.

The above objects of the present invention are achieved by a web cooling method characterized by forming a falling film of cooling liquid on the web surface.

Hereinafter, the contents of the present invention will be explained in more detail with reference to the accompanying drawings.

FIG. 1 shows a conventional web cooling method in a liquid-fed electrolysis method using a radial electrolytic cell.

The water is introduced into the decomposition tank 3 by guides 30 and 2, then introduced into the cathode electrolytic tank 6 by guide rolls μ and j', and transferred to the outside of the tank by guide rolls 7. be done. r・ri・10-// is an electrode, which faces the metal web l which is wound around drum rollers /2 and 13 and runs 1
and are placed in the electrolytic cells 3 and 6, respectively.

In addition, the electrolyte is supplied by pumps /4 and /7 from the electrolyte supply port /g and /j located at the lower center of each electrolytic cell, filling the gap between the electrode and the metal web, and causing the auburn. 0-mouth/l
-7F-20-21VC is drained out of the tank and returned to the electrolyte tank for circulation.

, 23 is a power source which connects one output terminal to electrode g-2 and the other output terminal to electrode 10-// to apply a voltage. The metal web 1 can be subjected to continuous electrolytic treatment using the above-mentioned methods. Between the anodic electrolytic cell 3 and the cathodic electrolytic cell 6, there is an interspecies portion where the metal web comes out of the cell and is exposed to the air. When Ds is high, heating occurs in this portion due to Joule heat, causing thermal distortion in the metal web 1. Conventional countermeasures for this have been to shorten the length of the interspecies part as much as possible, and to use a 24cm spray nozzle. A method of cooling a metal web by spraying an electrolyte onto the metal web has been used.

Ds is usually 10 to /θA/-mm2. Conventionally, the metal web was transferred horizontally in this interspecies portion, and no flow film was formed on the surface of the metal web, resulting in an insufficient cooling effect. The present invention relates to a cooling method for this part, and provides an excellent cooling method that enables extremely stable electrolytic processing even in high current density processing.

In FIG. 2, which shows an embodiment of the method of the present invention, a metal web 31 is introduced into an anode electrolytic cell 33 by a guide roll 32 and then guided by a guide roll J4'.3! is introduced into the cathode electrolytic cell 3t, and transferred to the outside of the cell by guide rolls 37. 3r, 3ri, ≠0-4'/ are electrodes, and the drum roller 11. ．． Electrolytic cells 33 and 3 are arranged inside, respectively, facing the metal web 31 that is wound and travels in 2 and ≠ 3 directions. In addition, the electrolyte is supplied from the electrolyte supply port Hirohiro 4A, 1 located at the lower center of each electrolytic cell to the pump≠t≠7, filling the gap between the electrode and the metal web. Then, the liquid is drained out of the tank from the overflow port 4AIr-hiro-to-zi, returns to the decomposition liquid tank j2, and is circulated again by the pump≠t-hiro7. There is also dust between the anode electrolyzer 33 and the cathode electrolyzer 36 at the interspecies part where the metal web 3/ comes out of the tank and is exposed to the air.In the method according to the present invention, the position of the guide roll 3 is ! The metal web is conveyed in the traveling direction with a downward slope α of 100 or more in the interspecies portion,
And there are cooling spray nozzles on both the top and bottom of the metal web.
A ZS is installed, and an electrolytic solution is sprayed onto the metal web 31 through a pipe j7 using a liquid pump j6 to form a falling liquid film on the surface of the metal web 3 for cooling. The liquid sprayed from the spray nozzle jlI- is applied to the metal web 31
The liquid flows parallel to the web on the top surface of the web, creating a strong, uniform liquid flow over the entire surface. Also, most of the liquid sprayed onto the metal web 31 by the spray nozzle jj adheres to the lower surface of the metal web 31, and then similarly generates a strong parallel flow of uniform liquid. This makes it possible to provide even and efficient cooling power over the entire surface of the metal web, making it possible to perform stable electrolytic treatment even when 3=/00~/j Oh/mrrL. Also, if the slope of the metal web is reversed, liquid flow can be generated on both the upper and lower sides of the metal web, but since the liquid flows in a countercurrent flow to the metal web, there is no turbulence in the flow at the interface. As described above, the feature of the present invention is that in the electrolytic treatment using liquid power supply, the metal web has a downward gradient of 700 degrees or more in the direction of travel in the interspecies part. This method involves transporting the material using a spray nozzle, and spraying electrolyte onto both upper and lower surfaces using a spray nozzle to cool the material.

In the present invention, in order to form a falling liquid film of cooling liquid on the web surface, in addition to using a spray nozzle as described in the examples, a hopper having a slit extending in the width direction of the web, a curtain liquid film, an extrusion method, etc. Hopper tubes Various embodiments are possible.

[Brief explanation of drawings]

Figure 1 is a diagram schematically showing a conventional web cooling method.
The figure is a diagram schematically showing a web cooling power flow according to the present invention. /, 3/... Metal web 12, /3.11.2, G3... Electrolytic cell 2λ,
jko...'electrolyte tank, 23,! 3...Power supply 2≠, λz, j'A, jtj...Spray nozzle 16.17, ≠t1≠7,! t・・・Liquid pump patent applicant Fuji Photo Film Co., Ltd. Voluntary procedure amendment letter Dear Commissioner of the Patent Office 1, Indication of the case Showa SR year, Patent Application No. 172g33 No. 2
, Title of the invention Web cooling method 3, Relationship with the case of the person making the amendment Patent applicant Address 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture Contact address 1
06 Higashi 3i (Miyakominato-ku, Nishi-Azabu 2, 26-30 Fuji Photo Film Co., Ltd. Higashij; Ipponne) Telephone: (406) 25
37 4. Subject of amendment Column 5 of "Detailed Description of the Invention" of the specification, Contents of the amendment (The statement in the "Detailed Description of the Invention" column of the 111311 specification is amended as follows. (1) Section 3 Insert “wo” after “output terminal” on page 1, line 12. (11) Correct “ro~10A/Ryu 2” on page 1, line 3 to “lO~/θθA/ho 2”. do.

Claims (1)

[Claims] A web cooling method characterized by forming a falling film of cooling liquid on the web surface.