JPH11138692A - Device and method for laminating metallic strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for laminating a metallic strip in which bubbles entangled between the metallic strip and a film are easily reduced even at the time of high-speed operation. SOLUTION: The device for laminating the metallic strip is equipped with a pair of laminating rolls 3 sandwiching the traveling metallic strip 1 and laminates a resin film 2 on one side or both sides of the metallic strip 1. The device is equipped with a means 9 for changing the infiltration angle (X of the metallic strip 1 into the laminating rolls 3. In this device, as a result of surveying the relation of the infiltration angle M of the metallic strip, carrier velocity V of the metallic strip and an area rate K of bubbles (the rate of projection area of a bubble generation part for the surface area of the metallic strip. The smaller the value is, the less bubbles become and adhesive properties of the film are good.), in the case of paying attention to only one side of the metallic strip, when the infiltration angle α of the metallic strip is regulated to the positive direction (the direction in which the metallic strip is separated from the film.), entanglement amount of bubbles is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for laminating a resin film on a running metal strip, and more particularly to a metal strip laminating apparatus and a laminating method for reducing air bubbles trapped between the metal strip and the film.

[0002]

2. Description of the Related Art In recent years, a material obtained by laminating a resin film such as PET on the surface of a metal band such as iron or aluminum has been widely used as a material for cans. Laminating methods include a method using an adhesive and a method of heat-sealing a film.

FIG. 2 is a view showing a conventional heat fusion type laminating apparatus. The metal strip 1 is heated to an appropriate temperature by a heating device 6 (induction heating, roll heating, or the like is used).
On the other hand, the film 2 is supplied to the laminating roll 3 via the guide roll 5, and in this process, the film 2 may be preheated. Further, the film 2 is pressed against the metal strip 1 by the laminating roll 3 and is fused by the heat of the metal strip 1. At that time, the laminating roll 3 also receives heat from the metal strip 1 and the surface temperature rises.
It is cooled to an appropriate temperature by the surface temperature control device 4. A water-cooled roll is often used as the surface temperature adjusting device 4, and the surface temperature of the laminating roll 3 can be maintained at an appropriate value by controlling the flow rate and temperature of the circulating water supplied to the water-cooled roll. The pressing force of the laminating roll 3 is supplied by hydraulic pressure via a laminating roll bearing 8 as shown in FIG.

However, in both of the above-described method using an adhesive and the method of heat-sealing the film, air bubbles may remain between the metal strip and the film, and this is particularly noticeable during high-speed operation. .

[0005] The air bubbles are brought into the laminating roll pressing part by the air accompanying the running metal strip and the film,
It is thought to be caused by being enclosed between the metal strip and the film. In particular, when large bubbles are present, the film breaks and peels during can making. Therefore, even during high-speed operation, reducing air bubbles trapped between the metal strip and the film and increasing the adhesion of the film have been issues to be solved for improving productivity and quality.

There are the following methods for reducing the entrapment of air bubbles. JP-A-63-23382
In Japanese Patent Publication No. 4 (KOKAI) No. 4, a resin film is applied to a metal strip by 30 to 9 times.
There is disclosed a method in which the film is supplied at an angle of 0 degrees and pressure-bonded by a laminate roll.

Japanese Patent Application Laid-Open No. Hei 5-269857 discloses a method of removing air fluid itself which causes air bubbles by reducing the pressure in the vicinity of a laminating roll pressing portion.

[0008]

However, it is understood that the film pressing method disclosed in Japanese Patent Application Laid-Open No. 63-233824 prevents the wedge effect of air fluid, but this method cannot be used alone at high speed operation. It is enough. In the method of reducing the pressure in the vicinity of the laminating roll bonding portion as disclosed in JP-A-5-269857, it is necessary to enhance the degree of sealing (seal) between the pressure reducing portion and the outside.
It is not easy to do it for rotating metal strips and rolls. In addition, a vacuum pump for depressurization is required, and its operation cost cannot be ignored.

An object of the present invention is to provide a metal band laminating apparatus and a metal laminating method for reducing bubbles trapped between a metal band and a film, even in a simple and high-speed operation, in order to solve the above problems. To provide.

[0010]

In order to solve the above problems and achieve the object, the present invention uses the following means. (1) The apparatus of the present invention is provided with a pair of laminating rolls sandwiching a traveling metal band, and is a device for laminating a resin film on one or both sides of the metal band. A laminating apparatus for a metal strip, characterized by comprising means for changing.

(2) In the method of the present invention, when a resin film is laminated on one or both sides of a traveling metal strip using the laminating apparatus described in (1) above, the metal strip enters the laminating roll. A method for laminating a metal strip, characterized in that the angle: α is set to a value given by the following equation (1) or more.

Α _min = 0.031 V−7.5 (1) where α is the angle of penetration of the metal band into the laminating roll (deg, the direction in which one side of the metal band is separated from the film is positive), V ： Conveyance speed of metal band (mpm)

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, in order to reduce the amount of bubbles entrained between the metal band and the film, the metal band on the laminating roll has to be reduced. It has been found that it is effective to set the angle of penetration of the metal sheet in the positive direction (the direction in which the metal strip moves away from the film).

Based on this finding, the present inventors have proposed a method of changing the angle of entry of a metal band into a laminating roll when laminating a resin film on one or both sides of a running metal band. The angle of entry of the metal band into the metal band (the direction in which one side of the metal band separates from the film is assumed to be positive) is adjusted to a certain value or more according to the transport speed of the metal band, so that simple and high-speed operation is possible. In addition, the present inventors have found a metal band laminating apparatus and a laminating method for reducing bubbles trapped between the metal band and the film, and have completed the present invention. Hereinafter, embodiments of the present invention will be described.

FIG. 1 is a diagram showing an example of a metal band laminating apparatus according to an embodiment of the present invention. As for the device configuration, the penetration angle α of the metal strip 1 into the laminating roll 3 can be changed by changing the pushing amount of the offset roll 9 in the horizontal direction as compared with the conventional device shown in FIG. ing.

In this device, the penetration angles α,
The relationship between the metal band transport speed V and the bubble area ratio K (the ratio of the projected area of the bubble generating portion to the metal band surface area, the smaller the value, the smaller the number of bubbles and the better the adhesiveness of the film) was investigated. The results shown in FIG. Obtained. That is, when attention is paid to only one surface of the metal band, if the angle of penetration α of the metal band is set in the positive direction (the direction in which the metal band moves away from the film), the amount of bubbles involved can be reduced.

Next, regarding the data shown in FIG. 3, the entry angle α for setting the bubble area ratio K to 3% or less is roughly as follows: α> −4.5 degrees when the metal band conveying speed V = 100 mpm, V = 2
It can be seen that α> −1.3 degrees at 00 mpm, α> 1.7 degrees at V = 300 mpm, and α> 4.8 degrees at V = 400 mpm. Based on this, FIG. 3 is rewritten in FIG. 4 to the relationship between the metal band transport speed V and the metal band penetration angle α.
It can be seen that if α is equal to or more than the value α _min given by the following equation, the bubble area ratio K can be suppressed to 3% or less.

Α _min = 0.031 V−7.5 where α is the angle of penetration of the metal band into the laminating roll (deg, the direction in which the metal band separates from the film is positive), and V is the transport speed of the metal band. (Mpm) The above method is particularly effective when laminating only one side of the metal strip.

When laminating on both sides of a metal band, if the amount of bubbles entrained on the surface of the metal band is to be reduced, the amount of bubbles entrained on the back surface increases, and products having different bubble area ratios on the front and back surfaces of the metal band. This method is effective particularly when it is desired to increase the film adhesion on one side (for example, on the inner surface side of the can). Hereinafter, examples of the present invention will be described to demonstrate the effects of the present invention.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the metal strip laminating apparatus according to the present invention, a 20 μm thick PET film (having a melting point of about 230 μm) was coated on one side of a steel strip having a thickness of 0.24 mm and a width of 1017 mm.
° C) with the operating conditions (No. 1-3, 2-3:
Example of the present invention, 1-1, 1-2, 2-1 and 2-2: Comparative Example) to produce a laminated metal band, and the bubble area ratio K was examined. Table 1 also shows the survey results.

From Table 1, it can be seen that the steel strip has an intrusion angle α of at least α _min within the range of the present invention. 1-3, 2-3
In each case, the bubble area ratio K is reduced to 3% or less. On the other hand, in Comparative Example No. in which the penetration angle α of the steel strip was out of the range of the present invention. In 1-1, 1-2, 2-1 and 2-2, the bubble area ratio K exceeds 3%, and the reduction of the bubble entrainment amount is not sufficient. From the above, it can be understood that bubbles can be reduced to a certain level or less by setting the steel strip penetration angle α to α _min or more within the range of the present invention.

[0022]

[Table 1]

[0023]

According to the present invention, the manufacturing conditions are specified by an inexpensive laminating apparatus having only a means for changing the angle of entry of the metal band into the laminating roll. Air bubbles generated between the band and the film can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a metal band laminating apparatus according to an embodiment of the present invention.

FIG. 2 is a view showing a schematic configuration of a conventional heat fusion type metal band laminating apparatus.

FIG. 3 is a diagram showing an influence of a metal band transport speed V and a metal band penetration angle α on a bubble area ratio K in the metal band laminating apparatus according to the embodiment of the present invention.

FIG. 4 is a view showing a relationship between a metal band transport speed V and a metal band intrusion angle α, which affects a bubble area ratio K, in the metal band laminating apparatus according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Metal band, 2 ... Resin film, 3 ... Laminate roll, 4 ... Surface temperature control device, 5 ... Guide roll, 6 ... Metal band heating device, 7 ... Top (turn) roll, 8 ... Laminate roll bearing, 9 ... Offset roll.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sadaka Masuda 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Hiroki Iwasa 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Sun Honko Co., Ltd.

Claims (2)

[Claims] 1. A device for laminating a resin film on one or both sides of a metal strip, comprising a pair of laminating rolls sandwiching a traveling metal strip, wherein a means for changing an angle of entry of the metal strip into the laminating roll is provided. A laminating apparatus for a metal strip, comprising: 2. When laminating a resin film on one or both sides of a running metal strip using the laminating apparatus according to claim 1, the angle of entry of the metal strip into the laminating roll: α is as follows: A method for laminating a metal strip, characterized in that the value is not less than the value given by the formula. α _min = 0.031V−7.5 (1) where α is the angle of penetration of the metal band into the laminating roll (deg, the direction in which the metal band separates from the film is positive), V: the conveyance of the metal band Speed (mpm)