JP3475368B2 - Surface treatment method for metal strip - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment method for metal strips, and more particularly to a mechanical surface roughening treatment method for roughening one surface of a metal strip in the surface treatment step.

[0002]

2. Description of the Related Art A conventional surface treatment method for a metal strip is known in which a metal strip wound around a delivery coil is rewound to a surface treatment section to mechanically roughen one side of the metal strip. Japanese Unexamined Patent Publication No. 56-30024 and Japanese Unexamined Patent Publication No. H6-6
No. 8663. That is, JP-A-56-
Japanese Patent Laid-Open No. 30024 discloses a surface treatment method for an aluminum plate as a roughening treatment using a rotating brush, and Japanese Patent Laid-Open No. 6-8663 discloses an outer winding surface of a metal strip (winding around a delivery coil). The surface roughening method of the lithographic printing plate support is shown in which the outer side surface in the pressed state is roughened with a rotating brush.

As described above, according to the conventional surface treatment method for metal strips, as shown in FIG. 11, the metal strip 2 unwound from the delivery coil 1 is provided with the rotary brush 4 provided in the surface treatment section 3. Was roughened by rotating the metal strip 2 in the transfer direction to brush the outer winding surface of the metal strip 2. In addition, the metal strip 2 that has been roughened
Is wound around the winding coil 5.

[0004]

However, when mechanical roughening treatment is performed on one surface of the metal strip 2 by the conventional surface treatment method for the metal strip, the width direction of the metal strip 2 after the surface treatment is increased. However, there is a drawback that the amount of curl (curvature) increases. By the way, the metal strip 2 wound around the delivery coil 1
As shown in FIG. 12, when the cut piece in the longitudinal direction is placed on the surface plate 6 with the outer winding surface facing upward, the center is curled in a high curved shape in the width direction. As described above, a curl in which the center of the metal strip 2 in the width direction is high when the outer winding surface is placed on the surface plate 6 is called a positive curl, and a curl of the opposite curl, that is, the width of the metal strip 2. A curl in which both ends in the direction become higher is called a negative curl. When the conventional method for treating the surface of a metal strip is performed, the curl amount is further increased, and the curl becomes a serious problem particularly in the aluminum support plate for a printing plate which requires flatness.

The present invention has been made in view of the above circumstances, and the roughening treatment can be applied to the metal strip, and at the same time, the curl amount in the width direction of the metal strip can be easily reduced. The purpose is to propose a method for surface treatment of metal strips.

[0006]

In order to achieve the above object, the present invention provides a method for surface-treating a metal strip, which comprises roughening one surface of the metal strip, wherein the metal strip is a flat plate.
A support for a printing plate and a support for the lithographic printing plate
Roughened with a rotating brush on the inner surface of the curl curled in the width direction
By applying a treatment, the lithographic printing plate support is roughened.
It is characterized in that the surface treatment and the curl correction are simultaneously performed . In addition, the present invention provides a metal for achieving the above object.
Surface treatment method of metal strip for roughening one side of strip
In the method, the metal strip is a lithographic printing plate support.
Curl in the width direction of the lithographic printing plate support.
Curl the inner surface of the curl with a rotating brush
After straightening, electrochemical surface treatment and chemical surface
At least one of the treatments is performed. Also,
In order to achieve the above object, the present invention provides a strip of metal strip.
In the surface treatment method of the metal strip for roughening the surface
The inner surface of the curl that is curled in the width direction of the metal strip.
After straightening the curl by mechanically roughening the
At least electrochemical surface treatment and chemical surface treatment
It is characterized in that one is applied.

[0007]

The present inventor mechanically roughens the outer winding surface (the outer surface in the state of being wound around the delivery coil) of the metal strip in the surface treatment for roughening one surface of the metal strip. When the treatment is applied, the curl in the width direction of the metal strip generated by being wound around the delivery coil is further increased (see FIG. 13), and the surface opposite to the outer winding surface, that is, the inner surface of the curl has mechanical The present invention has been completed by paying attention to the fact that the curl amount of the curl that has already occurred can be reduced by performing such roughening treatment.

That is, according to the present invention, when the surface of the metal strip is roughened, the inner surface of the curl curled in the width direction of the metal strip is mechanically roughened so that the curl is curled. I tried to correct it. This makes it possible to reduce the curl amount at the same time as the roughening treatment of the metal strip. Further, by performing at least one of an electrochemical surface treatment and a chemical surface treatment after the surface roughening treatment, it is possible to roughen a complicated pattern and mechanically roughen the surface. The curl amount reduction effect by the treatment can be increased.

A preferred embodiment of the surface treatment method for metal strips according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of a surface treatment apparatus for metal strips according to the present invention. The metal strip 10 will be referred to as a web and will be described below. As shown in FIG. 1, the surface treatment apparatus rewinds the wound web 10, a delivery coil 14 that rewinds the rewound web 10, a surface treatment unit 12 that performs a surface treatment on the rewound web 10, and a surface-treated web 10. Take-up coil 16
And a plurality of pass rollers 18, 18 forming a transfer path for the web 10. Moreover, the web 10 delivered from the delivery coil 14, the outer winding surface (sending coil 1 4
The web is wound on the winding coil 16 so that the outer surface of the web in the state of being wound on the lower surface becomes the lower surface and is wound on the winding coil 16. Further, the surface treatment unit 12 includes a rotary brush 20 which is located above the web 10 and rotates in the transport direction of the web 10.
Is provided. As shown in FIG. 2 (a view of the rotary brush 20 from the winding coil 16 side), the rotary brush 20 has a large number of bristles 20B, 20B, ... By rotating in the transport direction of the web 10 to brush the inner winding surface of the web 10 (the inner surface of the web in the state of being wound around the delivery coil 14).
Roughen the surface.

Next, the surface treatment method of the metal strip of the present invention will be described using the surface treatment apparatus configured as described above. The web 10 unwound from the delivery coil 14 is unwound in the state of being curled in the width direction of the web 10 as described with reference to FIG. That is, as shown in FIG. 1, in the transfer state of the web 10 with the inner winding surface of the web 10 facing upward, the curl direction of the web 10 with respect to the rotating brush 20 has the relationship shown by the solid line in FIG. Then, the curl inner side surface 10 of the web 10 transferred along the transfer path in the curled state in the width direction as described above.
A is brushed with the rotating brush 20, and the web 10 is mechanically roughened. As a result of the mechanical roughening treatment on the inner surface 10A of the curl, the web 10 has a surface as shown in FIG.
The curl is corrected as indicated by the chain line. As described above, according to the surface treatment method for a metal strip of the present invention, when one surface of the web 10 is roughened, the web 1
Since the inner surface 10A of the curl curled in the width direction of 0 is subjected to the mechanical roughening treatment, the curl amount can be reduced at the same time as the roughening treatment of the web 10. As a result, the X position in FIG. 1 (before the roughening process of the present invention is performed)
The web 10 curled in (1) is flattened at the Y position (after the roughening treatment of the present invention) as shown by the chain double-dashed line in FIG.

Further, in the above, the curl inner surface 10A curled in the width direction of the web 10 is mechanically roughened to correct the curl generated by being wound around the delivery coil 14. However, the web 10 curled by the mechanical roughening treatment may be used for flattening. Next, another embodiment of the metal strip according to the present invention will be described with reference to FIGS. 3 and 4. The same members as those in the first aspect will be described with the same reference numerals.

In the first mode, the outer winding surface of the web 10 unwound from the delivery coil 14 is transferred along the transfer path so that the lower surface is the lower surface. In the second embodiment, the outer winding surface is the upper surface, in other words, the inner winding surface. This is the case when the transfer path is moved so that the bottom surface is on. In this case, the surface treatment unit 12 is provided with a rotating brush 20 located below the web 10 and rotating in the transport direction of the web 10. At this time, the curl direction of the web 10 with respect to the rotary brush 20 has the relationship shown by the solid line in FIG. 4 (a view of the rotary brush 20 from the winding coil 16 side). Then, the curl inner side surface 10 of the web 10 transferred along the transfer path in the curled state in the width direction as described above.
A is brushed with the rotating brush 20, and the web 10 is mechanically roughened. As a result, in the second mode as well as in the first mode, the curl amount can be reduced at the same time as the roughening treatment of the web 10, so that the curled web 10 is flat as shown by the chain double-dashed line in FIG. Can be transformed.

Next, a third aspect of the present invention will be described with reference to FIG. The first and second aspects have been described with respect to an example in which the web 10 is mechanically roughened by using the rotating brush 20, but in the third aspect, the liquid ejector 22 is used. That is, the high pressure liquid 24 is continuously and radially sprayed from the liquid ejector 22 to the curl inner surface 10A curled in the width direction of the web 10 to be transferred. Figure 5 (a)
5 shows the curl direction of the web with respect to the liquid ejector 22 (web shown by the solid line) when the web 10 is unwound so that the outer winding surface is the lower surface as shown in FIG. 1, and FIG.
Is the web 1 with respect to the liquid ejector 22 when the web 10 is unwound so that the outer winding surface is the top surface as shown in FIG.
A curl direction of 0 (web indicated by a solid line) is shown.
Thereby, also in the case of the third aspect, the same effect as that of the first aspect can be obtained, so that the web 10 is subjected to the surface roughening treatment and, at the same time, as shown in FIG. 5 (a) and FIG. The web 10 is flattened as shown by a chain line.

Next, a fourth aspect of the present invention will be described with reference to FIG. The fourth mode is a case where a roller 26 having a roughened surface is used as a means for mechanically roughening the web 10, and the roller 26 rotates in the transport direction of the web 10. FIG. 6A shows the roller 2 when the web 10 is rewound so that the outer winding surface is the lower surface as shown in FIG.
Web curl direction for 6 (web indicated by solid line)
6 (b) and 3 show the curl direction of the web 10 with respect to the roller 26 (the web shown by the solid line) when the web 10 is rewound so that the outer winding surface is the upper surface. There is. Then, the transported web 10 comes into contact with the surface of the rotating roller 26 by the curl inner surface 10A curled in the width direction. Thereby, also in the case of the fourth mode, the same effect as that of the first mode can be obtained, so that the web 10
Is subjected to the surface roughening treatment, and at the same time as shown in FIGS.
(B) it is planarized as web 10 shown by a two-dot chain line in.

[0015]

EXAMPLES Next, examples of the case where the surface treatment method for a metal strip according to the present invention is carried out under the following conditions will be explained. (1) Material of metal strip (web): aluminum (2) Plate thickness of metal strip x width: 0.3 x 1300 mm (3) Surface treatment means of metal strip: rotating brush (4) Metal strip Web tension of surface treatment: 300-50
0 kg / width (5) Transfer speed of metal strip: 50 to 100 m / min (6) Method for measuring curl amount in web width direction As shown in FIG. 7, from one cut piece in the longitudinal direction of the web 10. Three strips 28 (20 mm x 300 m in the width direction)
m) Cut out, lean it on a surface plate, and measure L and H shown in FIG. Then, the curvature ρ of each strip 28 is obtained from the measured L and H by the following formula, and the average value of ρ of the three strips 28 is calculated.

[0016] The curvature ^{ρ = 2H / (H 2 +} L 2/4), the crude curl direction and the curl amount and Y position (the present invention in the X position in FIG. 1 (prior to application of the roughening treatment of the present invention) The curl direction and the amount of curl (after the surface treatment) were measured by the methods described above, and the results are shown in FIG. Also,
X'position in FIG. 11 (before the conventional roughening process)
The curl direction and the curl amount at and the Y'position (after the conventional roughening treatment) are measured and the curl direction and the curl amount are measured.
The results are shown in Fig. 10. Here, the curl direction is
As described above, when the web 10 is placed on the surface plate with the outer winding surface facing upward, the curl in which the widthwise center of the web 10 becomes high is positive, and the opposite curl, that is, the widthwise ends of the web 10 are The higher curl is negative.

As is apparent from FIGS. 9 and 10, the negative curl is corrected at the Y position when the web 10 having the negative curl at the X position is subjected to the surface treatment method of the metal strip of the present invention. The web 10 is flattened. on the other hand,
The positive curl is further increased at the Y'position where the conventional metal belt surface treatment method is applied to the web 10 having the positive curl at the X'position.

As described above, according to the surface treatment method for a metal strip of the present invention, the curl is corrected by mechanically roughening the curl inner surface 10A of the metal strip 10 curled in the width direction. Therefore, it is possible to reduce the amount of curl at the same time as the roughening treatment, to a state where there is no curl or there is almost no curl. The rotation speed of the rotating brush for surface roughening, the injection pressure of the high-pressure liquid from the liquid ejector, the degree of surface roughening applied to the rollers, the transfer speed of the metal strip to be transferred, etc. By appropriately changing the curl amount of the object, it is possible to correct the curl of the metal strip and make it flat. In addition, the roughening treatment is not limited to one time, and may be performed a plurality of times when the curl does not be corrected by one roughening treatment. Also,
After the surface-roughening treatment of the present invention, if electrochemical surface-roughening treatment such as electrolytic treatment or chemical surface-roughening treatment such as etching is performed, roughening of a complicated pattern is performed. It is possible to increase the effect of reducing the curl amount by the mechanical roughening treatment.

[0019]

As described above, according to the method for surface-treating a metal strip of the present invention, when the surface of the metal strip is roughened, the curl inner surface curled in the width direction of the metal strip. Since the mechanical surface roughening treatment is performed on, the curling amount can be reduced simultaneously with the surface roughening treatment of the metal strip. Therefore, it is particularly useful for roughening treatment of a lithographic printing plate support which requires flatness.

Further, by performing at least one of electrochemical surface treatment and chemical surface treatment after the surface roughening treatment, it is possible to roughen a complicated pattern and to perform mechanical surface treatment. The effect of reducing the curl amount due to the surface roughening treatment can be increased.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for explaining a first aspect of the present invention.

FIG. 2 is an explanatory view for explaining the curl direction of the metal strip with respect to the rotating brush, as seen from the winding coil side in FIG. 1;

FIG. 3 is a schematic diagram illustrating a second aspect of the present invention.

FIG. 4 is an explanatory view for explaining the curling direction of the metal strip with respect to the rotating brush, as seen from the winding coil side in FIG. 3;

FIG. 5 is a third aspect of the present invention, in which (a) is a case where the outer winding surface of the metal strip is a lower surface and is transferred through a transfer path, (b)
Is an explanatory view when the outer winding surface of the metal strip is the upper surface and is transferred through the transfer path

FIG. 6 is a fourth aspect of the present invention, in which (a) is a case where the outer winding surface of the metal strip is a lower surface and is transferred through a transfer path, (b)
Is an explanatory view when the outer winding surface of the metal strip is the upper surface and is transferred through the transfer path

FIG. 7 is an explanatory diagram illustrating a method for preparing a sample for measuring the curl amount of a metal strip.

FIG. 8 is an explanatory diagram illustrating a measurement method for measuring the curl amount of a metal strip.

FIG. 9 is an explanatory view for explaining the curl direction and the curl amount of the metal strip before and after the surface treatment method of the metal strip in the example of the present invention.

FIG. 10 is an explanatory diagram illustrating a curl direction and a curl amount of a metal strip before and after performing a conventional surface treatment method for a metal strip.

FIG. 11 is a schematic view of an apparatus for explaining a conventional surface treatment method for metal strips.

FIG. 12 is an explanatory diagram illustrating a curling direction of a metal strip.

FIG. 13 is an explanatory view illustrating the curling direction of the metal strip with respect to the rotating brush, as seen from the winding coil side in FIG. 11.

[Explanation of symbols]

10 ... Metal strip (web) 12 ... Surface treatment section 14 ... Sending coil 16 ... Winding coil 20 ... Rotating brush 22 ... Liquid ejector 26 ... Roller with roughened surface

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Claims (3)

(57) [Claims] 1. A method for surface-treating a metal strip, comprising roughening one side of a metal strip, wherein the metal strip is a support for a lithographic printing plate, and
Curled inner surface curled in the width direction of the lithographic printing plate support
Roughening treatment with a rotating brush on the flat plate
Simultaneous surface roughening and curl correction on the printing plate support
Surface treatment method for a metal strip, characterized in that it is carried out in the. 2. A metal strip for roughening one side of a metal strip.
In the method for surface-treating a sheet , the metal strip is a support for a lithographic printing plate, and
Curled inner surface curled in the width direction of the lithographic printing plate support
After roughening the surface with a rotating brush to correct the curl
With less electrochemical surface treatment and less chemical surface treatment
Surface treatment of metal strips characterized by applying both sides
Method. 3. A metal strip for roughening one side of a metal strip.
In the surface treatment method for a strip-shaped material, a machine is applied to the inner surface of the curl curled in the width direction of the metal strip.
After correcting the curl is subjected to械的surface roughening treatment, electrochemical surface treatment and surface treatment method of chemical surface characteristics and to Rukin genus strip to be subjected to at least one of the processing.