JPH0890756A - Gravure offset printing machine for steel strip - Google Patents

Abstract

(57) [Summary] [Purpose] It is intended to prevent the steel strip edge from being etched and the thickness of the strip being reduced so that the tensile stress of the steel strip is concentrated and the sheet is broken. [Structure] Using a gravure offset printing machine for steel strips having a gravure roll 1, an offset roll 2 and a backup roll 3 each having a length wider than the width of the steel strip 1, a printing film portion and a non-printing portion are formed on the entire width of the steel strip 4. Perform resist printing consisting of. Next, the crushing roll 8 is brought into contact with the edge portion of the steel strip on the backup roll 3 and rotated to crush the resist printed film portion of the edge portion to backfill the groove of the non-printed portion and cover with the resist film to cover the edge portion. The entire surface is covered with a resist film. Since the edge of the steel strip is protected by the resist film during the etching process, there is no reduction in plate thickness due to etching. Therefore, it is possible to prevent the plate from breaking from the edge portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is characterized in that a steel strip is subjected to resist printing consisting of a printed film portion and a non-printed portion, then the non-printed portion of the steel strip is etched, and finally the resist printed film is peeled off. The present invention relates to a gravure offset printing machine for steel strips, which is designed to increase the added value of steel strips.

[0002]

2. Description of the Related Art In order to increase the added value of a steel strip, a resist film is printed on the steel strip by using a gravure offset printing machine, the non-printed portion is etched by electrolytic etching, and then the resist film is peeled off. It is generally done. When such a resist film is printed on a steel strip, it is printed on the entire width of the steel strip using a gravure roll wider than the width of the steel strip. As a result, even if the width of the steel strip changes, it is possible to print the entire width of the steel strip without changing the gravure roll.

For example, in the case of a silicon steel strip, as shown in FIG. 5, a groove 4a oriented in the width direction of the steel strip 4 is continuously engraved in the longitudinal direction to subdivide the magnetic domains of the steel strip 4 to form a surface layer. The eddy current is suppressed and the iron loss is reduced. As means for imparting grooves to such a silicon steel strip, first, a gravure offset printing machine is used to continuously print a resist print film in the longitudinal direction on the portion of the steel strip 4 excluding the portion of the groove 4a facing the width direction. .

As shown in FIG. 4, a gravure offset printing machine applies the ink in an ink pan 5 to the surface of a large number of gravure rolls 1 provided on the outer peripheral surface in grooves engraved in the width direction, and then a gravure roll doctor. After the excess ink is scraped off by the blade 6, the ink is further attached to the offset roll 2 that comes into contact with the gravure roll 1, the ink is transferred to the steel strip 4, and the ink remaining on the offset roll 2 is removed by the doctor blade 7 for the offset roll. Scrape off and clean. The ink film adhering to the surface of the offset roll 2 is transferred as a resist film having a groove oriented in the width direction onto the steel strip 4 wound around the backup roll 3 and passed through.

As shown in FIGS. 5 and 6, the steel strip 4 thus printed with the resist film 4b having the groove 4a oriented in the width direction is then subjected to electrolytic etching to unprint the groove 4a without the resist film 4b. By etching the portion, as shown in FIG. 7, a groove 4 oriented in the width direction is formed on the surface of the steel strip 4.
c is given. Subsequently, the resist film 4b printed on the surface of the steel strip 4 is peeled off to continuously form a groove 4c oriented in the width direction on the surface of the steel strip 4 in the longitudinal direction as shown in FIG.

When the groove 4c is provided in the entire width of the steel strip as described above, the following problems occur. Problem: In other words, since the entire width of the steel strip is etched and the edges of the steel strip are also etched, the non-printed portions of the edges become thinner due to etching,
The tensile stress due to the tension of the steel strip is concentrated here, and the plate is easily broken.

On the contrary, the following measures have been taken conventionally. (1) "Edge mask" for electrolytic etching cells
Is used to prevent the etching of the edge portion. However, the "edge mask" device has the following problems. a. Expensive. b. The "edge mask device" also comes into contact with the etching solution and is easily corroded.
c. Since there is a moving part in the liquid, liquid leakage is likely to occur between the liquid and the driving device outside the liquid. d. Since the “edge mask” is inserted between the electrodes, the electrode interval is widened and the power cost is increased.

(2) The plate width of the gravure roll is made narrower by 5 mm on both edges than the plate width, and the gravure roll is replaced according to the plate width. However, this method of replacing the gravure roll has a problem that it takes about 3 hours at a time and the efficiency is lowered due to the line stop, and the yield is lowered due to the non-printed portion. (3) Further, Japanese Patent Laid-Open No. 4-160115 discloses a proposal for leaving a side edge in local heating for domain division. However, this is a countermeasure for the electron beam irradiation apparatus, and it is fundamentally impossible to directly apply this apparatus to the gravure offset printing machine.

(4) Further, in a coating machine, Japanese Patent Laid-Open No.
-207863 is available. However, this means transfers the paint picked up on the coater roll onto a wiper roll provided in parallel with the coater roll prior to coating,
Then, the paint transferred onto the wiper roll is removed. Therefore, the thickness of the coating film on the edge portion of the steel strip is thin or uncoated. When etching is performed in this state, the edge portion of the steel strip is rather easily etched, and the edge portion is easily broken. In order to prevent the plate from breaking, on the contrary, it is necessary to increase the film thickness of the edge portion, which has the opposite effect.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and does not use a problematic "edge mask device", and uses a gravure roll in the width of a steel strip. Accordingly, it is an object of the present invention to provide a gravure offset printing machine for steel strips that can prevent plate breakage from the edge portion of the steel strips without replacement according to the above.

[0011]

The present invention for achieving the above-mentioned object uses a gravure roll, an offset roll and a backup roll for a continuously running steel strip from a printing film portion and a non-printing film portion. In a gravure offset printing machine designed to perform resist printing, use gravure rolls, offset rolls and backup rolls that are wider than the width of the steel strip, and use steel strip edges on the backup roll or steel strip edges on the offset roll. The gravure / offset printing machine for steel strips is characterized in that the printing film portion of the resist printing is pushed up to the non-printing portion, and a pushing roll is installed to cover the entire edge of the steel strip with the resist film. .

[0012]

In the present invention, the gravure roll wider than the width of the steel strip,
Resist printing is once performed on the entire width of the steel strip using an offset roll and a backup roll. After that, the resist printing film on the steel strip edge portion on the backup roll or on the steel strip edge portion of the offset roll is crushed and pushed away using a roll to cover the entire steel strip edge portion with the resist film. Therefore, the subsequent electrolytic etching is
Since it acts only on the non-printed portion except the edge portion of the steel strip and the resist-printed film portion, the edge portion of the steel strip is not etched. Therefore, the thickness of the steel strip edge portion is maintained as it is, and the tensile stress due to the tension of the steel strip can be prevented from concentrating on the edge portion. As a result, it is possible to reduce the occurrence of troubles such as plate breakage starting from the edge portion of the steel strip.

[0013]

EXAMPLES Examples in which the present invention is applied to a silicon steel strip will be described below with reference to the drawings. As shown in FIG. 3, the gravure offset printing machine is the same as that described based on FIG. 4, and therefore, the same components are denoted by the same reference numerals and duplicate description is omitted. In the present invention, the gravure roll 1, the offset roll 2 and the backup roll 3 which are wider than the width of the silicon steel strip (hereinafter simply referred to as steel strip) 4 in FIG.
By using, the printing including the resist printing film portion having the resist film and the non-printing portion having no resist film is performed over the entire width of the steel strip 4.

Then, the crushing roll 8 is brought into contact with the edge portion of the steel strip 4 wound on the backup roll 3 and passed through to crush the resist film so that the non-printed portion is also covered with the resist film. Is. For example, referring to FIG. 6, the resist film 4b is crushed by the crushing roll 8 at the edge portion of the steel strip 4 to form the groove 4a.
Is covered with the resist film 4b so as to be backfilled.

In the present invention, instead of bringing the crushing roll 8 into contact with the edge portion of the steel strip 4 wound on the backup roll 3, as shown in FIG.
The crushing roll 9 may be installed at the portion corresponding to the steel strip edge. In this case, the resist film of the offset roll 2 is crushed by the crushing roll 9 in the portion corresponding to the steel strip edge, and the entire portion corresponding to the steel strip edge is covered with the resist film. Therefore, a resist film having no non-printed portion is transferred from the offset roll 2 to the edge portion of the steel strip 1 on the backup roll 3, and the entire edge portion of the steel strip is covered with the resist film. The width of the edge portion is preferably 5 to 20 mm in order to prevent the plate from breaking due to the tensile stress concentration at the edge portion of the steel strip. The reason is that if it is less than 5 mm, the effect of preventing plate breakage against stress concentration is small, and if it exceeds 20 mm, it causes a yield loss.

1 and 2 show a backup roll 3
The concrete apparatus in the case of placing the pushing roll 8 in contact with the edge portion of the steel strip 4 wound up is shown. Figure 1
Further, as shown in FIG. 2, the support frame 11 is provided with moving motors 12 on both sides in the width direction so as to correspond to both edges of the steel strip 4, and is connected to each moving motor 12. The moving screw 13 is connected to the moving carriage 15 via a bearing 23. Further, the moving carriage 15 is installed along the moving rail 14 laid on the support frame 11 so as to be able to move forward and backward.

A drive motor is mounted on the support base 21 of the moving carriage 15.
16 is installed, and the pulley 22 attached to the rotary shaft 16a of the drive motor 16 and the pulley 19a attached to the fulcrum shaft 19 supported by the bearing 23 arranged on the moving carriage 15 The timing belt 17a is stretched around. Furthermore, the shaft 18 is attached to the tip of the arm 20 so as to be rotatable around the fulcrum shaft 19.
The crushing roll 8 is arranged through the
drive timing belt 17b between a and the pulley 18a.
Has been passed over. A drive cylinder 10 is arranged between the support base 21 and the arm 20.

Next, the operation of the present invention will be described. When the driving motor 12 is driven and the moving screw 13 is rotated, the moving carriage 15 is moved via the bearing 23, whereby the positions of the crushing rolls 8 on both sides are first aligned with the edges of the steel strip 4. To do. Subsequently, the driving cylinder 10 is driven to rotate the arm 20 about the fulcrum shaft 19 as a fulcrum, and the crushing roll 8 is wound around the backup roll 3 and adjusted to such an extent that the steel roll 4 is lightly contacted or not connected. .

Steel which is passed through the backup roll 3 through the gravure roll 1 and the offset roll 2 by rotatably driving the gravure roll 1, the offset roll 2 and the backup roll 3 in the direction of the arrow. Grooves extending in the width direction are continuously formed in the longitudinal direction over the entire width of the strip 4 to form a resist printing film.

At the same time, the driving motor 16 is driven to rotate the crushing roll 8 in the arrow direction via the pulley 22, the timing belt 17a, the pulley 19a, the timing belt 17a and the pulley 18a. As a result, the resist printing film formed on the edge portion of the steel strip 4 is crushed and the groove is backfilled, and the entire edge portion is covered with the resist film. At the edge portion of the steel strip 4 on the backup roll 3, since the peripheral speed of the crushing roll 8 is different from the moving speed of the steel strip 4, the resist film on the steel strip 4 is flattened by crushing and the non-printed portion is eliminated. As a result, the steel strip edge portion is not etched when the electrolytic etching treatment is performed in the next step. Therefore, no groove is formed in the edge portion, and it is possible to prevent the plate from breaking from the edge portion. Conventionally, the plate rupture occurred 2 to 5 times a month in the etching material of the silicon steel strip, but the gravure offset printing machine of the present invention can completely prevent the plate rupture due to the edge portion. .

Even when the crushing roll 9 is installed on the portion corresponding to the steel strip edge on the offset roll 2, the position of the push-rolling roll 9 is adjusted by using a moving device similar to the moving device shown in FIGS. 1 and 2. be able to. In the above embodiments, the case where a large number of grooves oriented in the width direction are provided in the longitudinal direction on the surface of the silicon steel strip has been described. However, the present invention is not limited to this, and a resist film is printed on various steel strips using a gravure offset printing machine. It goes without saying that it can be applied to

[0022]

As described above, according to the present invention, since the gravure roll, the offset roll and the backup roll wider than the width of the steel strip can be used, it is necessary to change the roll according to the width of the steel strip. In addition, the time for changing rolls can be saved.

After performing printing by forming a resist film on the entire width of the steel strip, the resist printed film on the edge portion of the steel strip is crushed toward the non-printed portion by a crushing roll to cover the entire edge portion with the resist film. To do. As a result, when the etching treatment is performed, the steel strip edge portion is not etched, and the strip thickness is not reduced, so that strip fracture due to stress concentration on the strip edge portion can be prevented.

[Brief description of drawings]

FIG. 1 is a side view showing an apparatus according to an embodiment of the present invention.

FIG. 2 is a concave view taken along the line AA of FIG.

FIG. 3 is a schematic side view showing the arrangement of crushing rolls in the steel strip gravure offset printing apparatus of the present invention.

FIG. 4 is a schematic side view showing a conventional steel strip gravure offset printing apparatus.

FIG. 5 is a plan view showing a state in which a resist printing film having grooves facing the width direction of a silicon steel strip is printed.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a front view showing a situation in which a groove is formed on the surface of a steel strip by etching after applying a resist printing film having a groove oriented in the width direction of a silicon steel strip.

FIG. 8 is a front view showing a state where the resist film is peeled off after engraving a groove on the surface of the silicon steel strip.

[Explanation of symbols]

 1 Gravure Roll 2 Offset Roll 3 Backup Roll 4 Steel Strip 5 Ink Pan 6 Doctor Blade for Gravure Roll 7 Doctor Blade for Offset Roll 8 Crushing Roll (Backup Roll) 9 Crushing Roll (Offset Roll) 10 Driving Cylinder 11 Support Frame 12 Motor for moving 13 Screw for moving 14 Rail for moving 15 Truck for moving 16 Motor for driving 17 Timing belt for driving 18 Shaft 19 Shaft shaft 20 Arm 21 Support 22 Pulley 23 Bearing

Claims (1)

[Claims] 1. A gravure offset printing machine in which resist printing consisting of a printing film portion and a non-printing portion is performed on a continuously running steel strip by using a gravure roll, an offset roll and a backup roll, Use gravure rolls, offset rolls, and backup rolls wider than the width of the steel strip, and press the printed film part of the resist printing to the non-printed part on the steel strip edge part on the backup roll or the steel strip edge part on the offset roll. A gravure / offset printing machine for steel strips, characterized in that an extruding roll is installed to cover the entire edge of the steel strip with a resist film.