JPS61136771A - Surface treatment method of metallic web - Google Patents

Abstract

PURPOSE:To prevent a wall surface of a treatment device and a supporting structure of a web from damage due to slurry, by supplying the slurry of low flow larger than the pipe close limit flow speed to a nozzle corresponding to the outside of a web width when the metallic web in small width is treated. CONSTITUTION:When a web 2, continuously conveyed by a supporting structure 1, provides a narrow width, a valve 4 for a nozzle 3-1, positioned outside from the web width, regulates the opening by a signal from a pressure sensor 7 through an oil hydraulic servo mechanism 8 or the like, supplying to these nozzles 3-1 a quantity of slurry of low flow larger than the pipe close limit flow speed. In this way, the supporting structure 1 and a wall surface of a treatment device can be prevented from damage due to projection of the slurry by controlling a supply quantity of the slurry to the nozzle 3-1 positioned outside the web width.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a metal web in which a slurry containing an abrasive is sprayed onto the metal web to treat the surface of the metal web and remove scale, etc. attached to the surface of the metal web. The present invention relates to a surface treatment method, particularly a slurry supply method in the surface treatment.

[Prior art]

As a treatment method for surface roughening and surface cleaning (removal of scale, etc.) of metal webs such as aluminum, high-pressure gas (air, etc.) or high-pressure liquid is applied to the surface of the metal web that is continuously running on a support. A method of spraying an abrasive material or an abrasive material (referred to as an abrasive material in the present invention) from a nozzle together with (water) has been carried out. In other words, a large number of nozzles are arranged in the width direction (including the width direction) of the web to be treated, and the above-mentioned surface treatment is performed over the entire width of the web, but it is necessary to treat a metal web with a large width. Therefore, when processing a narrow web, a large number of nozzles are arranged to correspond to the maximum width of the web, and in order to avoid damage to the support in the part that protrudes from the web and wasteful consumption of slurry, The supply of slurry was stopped to the nozzles corresponding to the outside of the web width.

(For example, JP-A-53-13284).

To explain this with reference to FIG. 2, a large number of nozzles 3 are arranged opposite to the treated surface of a metal web 2 that is continuously run (perpendicular to the plane of the paper in the figure) by a support 1 such as an endless belt. , slurry adjustment pulp 4, main valve 6
The nozzle 3 is connected to the slurry supply tank of the slurry tank via the nozzle 3.

(The supply system has been omitted.) In this case, the nozzles 3 are arranged in a manner that corresponds to the maximum width of the web and can perform surface treatment over the entire width.

When processing the widest metal webs, the slurry is evenly distributed from valve 4 to all nozzles 3 (including 3-1) and high pressure gas or high pressure water (2) is sprayed onto the surface of the web to be processed. be done.

At this time, check the valve 6 so that the pressure gauge 5 is at the appropriate value for processing.
to supply the optimum amount of liquid to each nozzle.

In the above system, when processing a narrow metal web 2 as illustrated in FIG. 2, the slurry adjusting pulp 4 of the nozzle 3-1.3-1 outside the web is closed to supply slurry. The main valve 6 is then readjusted so that the pressure on the pressure gauge 5 is at an appropriate value.

[Problems to be solved by the invention]

However, if surface treatment of a narrow web is operated for a long period of time with the supply of slurry to nozzle 3-1. When the piping is blocked and a wide metal web is processed, there is a problem that the slurry is not discharged from the nozzle 3-1.3-1 or only a small amount is discharged. In order to avoid this, even if the web width becomes narrow, the operation may be performed with all the pulps 4 open, but in this case, the nozzles 3-1, 3-1 corresponding to the outside of the web The required amount of predetermined flow rate is also supplied to
In addition, since the light is projected onto the wall of the processing apparatus and the support of the web (the portion protruding from the web), there are problems such as damage to the wall and the support.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for surface treatment of a metal web, in particular a method for supplying slurry in surface treatment of a metal web, which eliminates the above-mentioned drawbacks.

[Means for solving problems]

That is, the present invention provides a surface treatment method for a metal web in which a slurry containing an abrasive is applied to various running metal webs having different widths using a projector, and the present invention is applicable to the width of the largest metal web. multiple slurry projection nozzles are arranged,
Width of the metal woop to be treated (: 8 mm for the corresponding nozzle)
When processing a small width metal web while supplying a small amount of slurry, a low flow rate of slurry larger than the tube blockage limit flow velocity is supplied to the nozzle corresponding to the outside of the web radius. This is a surface treatment method.

In the present invention, the total slurry projection nozzle flow is 1O-20OA per tv nozzle! It is preferable to supply the slurry in an amount such that the flow rate Y0.02 of the slurry projection nozzle corresponding to the outside of the web width is 0.2 m/sec when processing a small width L-bub.

The present invention will be explained in detail below.

The present invention is used to treat the surfaces of various metals (for example, roughening, removing scale, etc.), and is particularly suitable for surface treatment of aluminum nibs used as supports for lithographic printing plates.

As the nozzle used in the present invention, a so-called liquid honing nozzle that injects slurry together with high-pressure gas such as air may be used, or a nozzle that injects slurry vi with aqua regia (for example,
No.) may be used.

The composition of the slurry used in the present invention consists of water and fine powder of abrasive material, and the fine powder is about 5 to 80% (juvenile ratio), and is usually used in an amount of about 30 to 5,096%. An acid or alkali can be added to the slurry if desired. Abrasives include diamond, quartz, flint, granite, alundum, silica, diatomaceous earth, sand, diamond sand, garnet, talc, pamine, dolomite, magnesium oxide, etc., and the desired particle size can be adjusted from 20 to +400.
A value of about 0 is used.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings in the case of roughening an aluminum laminated nib.

FIG. 1 is an explanatory diagram showing an embodiment of the non-inventive method,
Nozzle 3 (3-
1) (high-pressure water supply system is omitted) are arranged δ corresponding to the largest width aluminum nibs.

A valve 4 and pressure sensor f-7 for adjusting the slurry flow rate are installed on the upper R, 0I1) of each nozzle 3 (3-1).
In addition, the pulp 4 is controlled to a predetermined pressure (
; control so that The predetermined flow rate of slurry required for surface treatment (roughening) is 10 to 200/min per nozzle.

Reference numeral 1 denotes a support, which may be an endless belt, a non-contactable support using a fluid film, or the like, and allows the Knib 2 to run continuously. When the width of the web 2 is narrow, according to the present invention, the nozzle 3-1. Set pressure. At this time, the flow velocity of the slurry is 0
．． It is about 0.02 to 0.2 m/sec. In this case, pressure water (
(or air) is supplied as is, but since the amount of slurry is small, it does not damage the supports, walls, etc.

FIG. 3 is an explanatory diagram showing an example of a flow rate adjustment mechanism used in the present invention, in which a predetermined setting value is given to the regulator 9 to operate the hydraulic servomechanism 8 to produce pulp 3 or 3.
-1 is controlled, pressure sensor f-7 confirms that a predetermined set value has been reached, and this is transmitted to the regulator for adjustment.

〔Effect of the invention〕

As described above, according to the present invention, when metal webs of various widths are subjected to continuous (two-surface treatment), slurry is supplied to all nozzles under the above-mentioned conditions, even during long-term operation. Slurry can be stably supplied without clogging the piping, and even when processing narrow web widths, the slurry can be supplied outside the web (corresponding nozzle number = flow rate of slurry supplied Since the amount of slurry is extremely small, abrasion damage to walls, supports, etc. due to the slurry can be substantially prevented.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an explanatory diagram showing an example of the method of the present invention, Fig. 2 is an explanatory diagram showing an example of surface treatment by the conventional slurry method (: It is an explanatory view showing an example of a slurry flow rate screen mechanism. 1... Support body, 2... Metal web, 3, 3
-1... Nozzle, 4... Slurry adjustment valve,
5...(3 other people)

Claims (2)

[Claims] (1) A method for surface treatment of a metal web by projecting a slurry containing an abrasive onto various running metal webs having different widths, in which a plurality of slurry projection nozzles are provided corresponding to the width of the maximum width of the metal web. The nozzle corresponding to the width of the metal web to be processed is supplied with the amount of slurry necessary for processing, and when processing a narrow metal web, the nozzle corresponding to the outside of the web width is provided with an in-tube blocker. A method for surface treatment of a metal web, characterized by supplying a slurry with a low flow rate greater than a critical flow velocity. (2) The flow rate of the slurry projection nozzle corresponding to the width of the web to be processed is 10 to 200 l/min per nozzle, and when processing a narrow web, the flow rate of the slurry projection nozzle corresponding to the outside of the web width is 0.02 The method for surface treating a metal web according to claim (1), wherein the slurry is supplied in an amount such that the rate is 0.2 m/sec.