Film roll, laminated metal strip, method for manufacturing film, and method for manufacturing laminated metal strip

Abstract

To provide a film roll, a laminated metal strip, a method for manufacturing a film, and a method for manufacturing a laminated metal strip, capable of suppressing exposure of a fixed label by a simple method when films are bonded to each other or when the laminated metal strip is manufactured even if breakage occurs at a bonding portion between films.SOLUTION: A film roll 8R around which a film 8 to be bonded to another film 4 is wound in a roll shape has a fixed label 9 for fixing a tip portion 8t of the film 8 to an outer peripheral surface, and a double-sided adhesive tape 10 stuck to the outer peripheral surface separately from the fixed label 9 from each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a film roll, a laminated metal strip, a method for manufacturing a film, and a method for manufacturing a laminated metal strip. [Background technology]

[0002] Conventionally, there are known devices and methods for continuously supplying and bonding a web, including a film or paper, to a continuously conveyed metal strip or electronic component. The web is wound in a roll (hereinafter referred to as a leading roll). The web is unwound from the leading roll and continuously supplied to the metal strip or electronic component, where it is pressed against the metal strip or electronic component. When the remaining length of the web on the leading roll becomes short, the web supply source is switched from the leading roll to a new roll (hereinafter referred to as a trailing roll). In order to supply the web to the metal strip or electronic component without interruption during the roll switching, a web splicing method known as a splicing method is known in which the web on the trailing roll is spliced ​​to the web on the leading roll (see, for example, Patent Document 1).

[0003] In the above-described web joining method, double-sided adhesive tape is affixed to the leading edge of the web of the following roll. The following roll is pressed against the web of the preceding roll, and the leading edge of the web of the following roll is joined to the web of the preceding roll via the double-sided adhesive tape. Specifically, to prevent the web from unwinding, the leading edge of the web of the following roll is fixed to the outer peripheral surface of the following roll with a fixed label. The double-sided adhesive tape is then adhered to at least a portion of the fixed label. The following roll is rotated, and the peripheral speed of the outermost portion of the following roll is made to approximately match the feed speed of the web of the preceding roll relative to the metal strip. When the peripheral speed of the outermost portion of the following roll and the feed speed of the web of the preceding roll relative to the metal strip or electronic components are approximately matched, the double-sided adhesive tape affixed to the leading edge of the web of the following roll is pressed against the web of the preceding roll. In this manner, the web of the following roll is joined to the web of the preceding roll via the double-sided adhesive tape. Thereafter, the upstream portion of the double-sided adhesive tape on the web of the leading roll in the feeding direction of the web to the metal strip is cut, thereby switching the web supply source from the leading roll to the trailing roll.

[0004] Patent Document 2 discloses a web splicing method in which the trailing end of a leading web being continuously conveyed is butted against the leading end of a following web, and the butted portion of the webs is joined with a splicing tape. This splicing method also involves ultrasonic welding the leading and trailing ends of the splicing tape across the web's width in the web's conveying direction. This creates a sloped, ultrasonically welded portion, thereby preventing discontinuous steps. It is also claimed that this can prevent the adhesive of the splicing tape from being exposed and the occurrence of application defects such as vertical streaks and bubbles. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-122210 [Patent Document 2] Japanese Patent Application Publication No. 4-145436 Summary of the Invention [Problem to be solved by the invention]

[0006] When the web described in Patent Document 1 is attached to a metal strip to produce a laminated metal strip, the metal strip is heated to a predetermined temperature, for example. Then, a pressure roll presses the metal strip and the web together to press the web onto the metal strip. The joint between the webs via the double-sided adhesive tape has a four-layer structure consisting of the web unwound from the preceding roll, the double-sided adhesive tape, the fixed label, and the web unwound from the following roll. Therefore, when the pressure roll presses the metal strip and the web together to press the web onto the metal strip, the difference in thickness between the joint and its surrounding area generates shear forces between them. Furthermore, the web is softened by heat from the metal strip, making it prone to deformation and shear. These factors may cause breakage of the web on the opposite side of the metal strip, sandwiched between the web in direct contact with the metal strip. The web in direct contact with the metal strip is pressed against the metal strip by the pressure roll, making it less susceptible to shear caused by the thickness mentioned above. If such an incident occurs, for example, the fixed label may become exposed at the broken portion of the web, and the adhesive of the fixed label may adhere to the laminated metal strip production line, contaminating the production line.Furthermore, the fixed label may fall onto the laminated metal strip production line, causing scratches on the production line.

[0007] Furthermore, the web joining method described in Patent Document 2 requires an ultrasonic welding device, which may increase the overall size of the device. Also, because ultrasonic welding is performed after joining the butt joints with a seaming tape, this may increase the working time required to join the webs together.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a film roll, a laminated metal strip, a film manufacturing method, and a laminated metal strip manufacturing method that can easily prevent exposure of a fixed label even if a break occurs at the joint between films when joining films together or when manufacturing a laminated metal strip. [Means for solving the problem]

[0009] The means for solving the above problems are as follows. (1) A film roll in which a film to be joined to another film is wound into a roll shape, and which has a fixed label that fixes the leading end of the film to the outer peripheral surface, and a double-sided adhesive tape that is attached to the outer peripheral surface at a distance from the fixed label. (2) The film roll according to (1), wherein the distance between the double-sided adhesive tape and the fixed label in the unwinding direction of the film is 1.0 mm or more and 20.0 mm or less. (3) The film roll according to (1) or (2), wherein the thickness of the double-sided adhesive tape is 10 μm or more and 100 μm or less. (4) A laminated metal strip in which the film unwound from the film roll described in any one of (1) to (3) is attached to at least one of the two surfaces of a metal strip, and which has a leading film attached to the metal strip prior to the film, and a joint in which the film is joined to the leading film via the double-sided adhesive tape, and the leading end of the film is attached to one surface of the metal strip. (5) A method for manufacturing a film that is continuously supplied and attached to at least one of the two surfaces of a metal strip, the method comprising: a first step in which a leading film is wound in a roll and the leading end of the trailing film is fixed to the outer peripheral surface of the trailing film roll by a fixed label, and double-sided adhesive tape is attached to the outer peripheral surface at a distance from the fixed label; a second step in which the supply speed of a leading film that is supplied to the metal strip ahead of the trailing film is synchronized with the speed of the rolled trailing film at the outermost peripheral portion; a third step in which the trailing film is joined to the leading film via the double-sided adhesive tape; and a fourth step in which the leading film is cut at a portion of the leading film upstream of the double-sided adhesive tape in the film supply direction relative to the metal strip. (6) The method for producing a film according to (5), wherein in the first step, the distance between the double-sided adhesive tape and the fixed label is set to 1.0 mm or more and 20.0 mm or less. (7) A method for producing a laminated metal strip, comprising attaching a film produced by the method for producing a film according to (5) or (6) to one side of the metal strip to produce a laminated metal strip. [Effects of the Invention]

[0010] According to the present invention, it is possible to suppress the exposure of adhesive when joining films or manufacturing laminated metal strips using a simple method without introducing new equipment or increasing the working time. Furthermore, even if a break occurs at the joint between the films, it is possible to suppress the exposure or detachment of the fixed label. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of a laminating device according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram illustrating bonding of films together. [Figure 3] FIG. 2 is a cross-sectional view of a joint between films. [Figure 4] FIG. 2 is a cross-sectional view of a joint between films in a laminated metal strip. DETAILED DESCRIPTION OF THE INVENTION

[0012] An example of an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below. The film according to this embodiment is a film that is attached to a metal strip to produce a laminated metal strip. Examples of the film include a film primarily composed of a polymer. Examples of the polymer include polyolefins such as PP (Poly Propylene) and PE (Poly Ethylene), polyesters such as PET (Poly Ethylene Terephthalate) and PBT (Poly Butylene Terephthalate), and blends thereof. In addition to the polymer that is the main component of the film, the film may contain, as needed, pigments, antiblocking agents, waxes, antioxidants, stabilizers, and the like. Furthermore, the film may contain, as needed, a primer for improving adhesive strength or coloring. The thickness of the film is not limited in this embodiment; the present embodiment is applicable regardless of the film thickness.

[0013] The metal strip according to this embodiment may be an aluminum strip, a steel strip, a copper strip, or the like, and the surface of these strips may be plated or chemically treated. The thickness of the metal strip is preferably 0.05 mm or more and 4.00 mm or less, and the width is preferably 100 mm or more and 2000 mm or less.

[0014] The film according to this embodiment is laminated onto a metal strip, for example, by a laminating device. FIG. 1 is a diagram showing an example of a laminating device. The laminating device 1 shown in FIG. 1 has a heating device 3 for a metal strip 2. The metal strip 2 is transported to the heating device 3 by a transport device (not shown), and the heating device 3 heats the metal strip 2 to a preset temperature. Although not shown in detail, a film 4 is wound into a roll (hereinafter referred to as a film roll). The film 4 is unwound from the film roll and transported to both sides of the metal strip 2 by a transport device. Then, the film 4 is pressed onto both sides of the metal strip 2 by a pressure roller 5 shown in FIG. 1, and the film 4 is heat-sealed to both sides of the metal strip 2. In other words, the film 4 is heat-pressed onto the metal strip 2. In this manner, a laminated metal strip 6 is produced.

[0015] In the example shown in FIG. 1, a cooling device 7 is disposed downstream of the pressure roll 5 in the conveying direction of the metal strip 2, cooling the laminated metal strip 6 to a predetermined temperature. Examples of cooling methods used in the cooling device 7 include liquid cooling, gas jet cooling, roll cooling, and mist cooling (gas-liquid mixed cooling). Liquid cooling may be water cooling using water. FIG. 1 shows an example in which water cooling is used as the cooling method in the cooling device 7. In the laminating apparatus 1 shown in FIG. 1, a film 4 is supplied to each of both surfaces of the metal strip 2, and the film 4 is pressure-bonded to each of both surfaces of the metal strip 2 by the pressure roll 5. However, instead of this, the film 4 may be supplied to one of the two surfaces of the metal strip 2 and attached thereto.

[0016] To improve the production efficiency and yield of the laminated metal strip 6, it is preferable to operate the laminating apparatus 1 continuously without stopping. Therefore, in this embodiment, when the remaining length of the above-mentioned film 4 (sometimes referred to as the leading film 4) in the film roll (hereinafter referred to as the leading roll) 4R becomes short, a film (hereinafter referred to as the trailing film) 8 unwound from a newly prepared trailing film roll (hereinafter referred to as the trailing roll) 8R is spliced ​​to the film 4 (hereinafter referred to as the leading film 4) unwound from the leading roll 4R. Then, the leading film 4 is cut at a portion upstream of the splice between the leading film 4 and the trailing film 8. In this way, the film supply source for the metal strip 2 is switched from the leading roll 4R to the trailing roll 8R.

[0017] Figure 2 is a diagram illustrating the joining of the films 4 and 8. As shown in Figure 2(A), when the remaining length of the leading film 4 on the leading roll 4R becomes short, a new trailing roll 8R is prepared. The trailing roll 8R is a roll of trailing film 8 that has the same structure as the leading film 4.

[0018] Of the two ends of the trailing film 8, one end (referred to as the leading end) 8t is located on the outer circumferential surface of the trailing roll 8R. In the example shown in Figure 2(A), the leading end 8t of the trailing film 8 is fixed to the outer circumferential surface of the trailing roll 8R by a fixed label 9. This is to prevent the trailing film 8 from unwinding.

[0019] In the example shown in FIG. 2 , the fixed label 9 is a single-sided adhesive tape. The adhesive strength of the fixed label 9 is preferably lower than that of a double-sided adhesive tape, described later, to prevent failure in bonding the films 4 and 8 together. The fixed label 9 is formed, for example, by using a substrate made of PET, cellulose, or nonwoven fabric, with a silicone, acrylic, or urethane adhesive applied to one of the two surfaces of the substrate. The fixed label 9 may be affixed along the entire width of the trailing roll 8R, or along at least 80% of the entire length. This is to reliably prevent the trailing film 8 from unwinding. Furthermore, since the fixed label 9 is intended to prevent the trailing film 8 from unwinding, as described above, multiple fixed labels 9 each approximately 10 mm wide may be affixed at regular intervals along the width of the trailing roll 8R to achieve this purpose. Alternatively, a fixed label 9 approximately 10 mm wide may be affixed only to the center of the leading end 8t of the trailing film 8 along the width of the trailing roll 8R. In these cases, component costs can be reduced compared to when the fixed label 9 is affixed across the entire width of the following roll 8R, or across 80% or more of the entire length. It is more preferable that the width of the fixed label 9 in the width direction of the following roll 8R is 10 mm or less. This is to prevent the fixed label 9 from overlapping with the double-sided adhesive tape described below, thereby preventing splice failures caused by the two overlapping.

[0020] 2(A), a double-sided adhesive tape 10 is applied to the outer peripheral surface of the trailing roll 8R, upstream of the fixed label 9 in the unwinding direction of the trailing film 8, at a predetermined distance from the fixed label 9, to join the trailing film 8 to the leading film 4. The above-mentioned step of applying the double-sided adhesive tape 10 to the trailing roll 8R corresponds to the first step of this embodiment.

[0021] The double-sided adhesive tape 10 may be formed by applying a silicone-based, acrylic-based, or urethane-based adhesive to both sides of a substrate made of, for example, PET, cellulose, or nonwoven fabric. The double-sided adhesive tape 10 may also be a so-called substrate-less double-sided adhesive tape, which does not have the above-mentioned substrate and is formed only by an adhesive.

[0022] The double-sided adhesive tape 10 may be colored to facilitate detection of the bonded portion between the films 4 and 8 via the double-sided adhesive tape 10. The thickness of the double-sided adhesive tape 10 is preferably 10 μm or more and 100 μm or less, and more preferably 10 μm or more and 25 μm or less. If the thickness of the double-sided adhesive tape 10 exceeds 100 μm, the difference in thickness between the bonded portion between the films 4 and 8 via the double-sided adhesive tape 10 and the thickness of the surrounding area of ​​the bonded portion will be excessively large. This may cause the preceding film 4 to break when the bonded portion between the films 4 and 8 is attached to the metal strip 2, as described below. On the other hand, if the thickness of the double-sided adhesive tape 10 is less than 10 μm, sufficient bond strength between the films 4 and 8 via the double-sided adhesive tape 10 may not be obtained. Furthermore, the width of the double-sided adhesive tape 10 in the width direction of the films 4 and 8 is preferably 40 mm or more and 100 mm or less. This is to ensure reliable bonding between the films 4 and 8, improve workability when bonding the films 4 and 8, and reduce product waste.

[0023] Here, the distance between the fixed label 9 and the double-sided adhesive tape 10 will be described. In this embodiment, when the double-sided adhesive tape 10 is attached to the trailing film 8, the distance d between the double-sided adhesive tape 10 and the fixed label 9 is preferably set to 1.0 mm or more and 20.0 mm or less. Furthermore, it is more preferable to set the distance d to 1.5 mm or more and 5.0 mm or less. If the distance d is less than 1.0 mm, if the leading film 4 breaks around the double-sided adhesive tape 10, the fixed label 9 may be exposed to the air. Furthermore, if the adhesive surface of the fixed label 9 is exposed, the adhesive of the fixed label 9 may adhere to the line roll (not shown) of the laminating device 1 or to adjacent films after winding, resulting in scratches and appearance defects. If the distance d is greater than 20.0 mm, the trailing film 8 may be turned up by the wind when the bonded films 4 and 8 are transported at high speed relative to the metal strip 2.

[0024] Since the double-sided adhesive tape 10 is used to bond the films 4, 8 together, the distance d is substantially maintained when and after the films 4, 8 are bonded together via the double-sided adhesive tape 10. The distance d can be confirmed by observing the bonded portion after the films 4, 8 have been bonded together via the double-sided adhesive tape 10.

[0025] After the double-sided adhesive tape 10 is applied to the trailing roll 8R, the trailing roll 8R is rotated, and the speed of the outermost periphery of the trailing roll 8R, i.e., the peripheral speed, is synchronized with the feed speed of the leading film 4 relative to the metal strip 2. When these speeds are approximately equal, the press roll 11 pushes up the leading film 4, pressing it against the trailing roll 8R. In this way, the double-sided adhesive tape 10 is pressed against the leading film 4 together with the trailing roll 8R, and the trailing film 8 is bonded to the leading film 4 via the double-sided adhesive tape 10. The process of synchronizing the speed of the outermost periphery of the trailing roll 8R with the feed speed of the leading film 4 relative to the metal strip 2 corresponds to the second process of this embodiment, and the process of bonding the trailing film 8 to the leading film 4 via the double-sided adhesive tape 10 corresponds to the third process of this embodiment.

[0026] Thereafter, as shown in FIG. 2(B), a portion of the leading film 4 upstream of the double-sided adhesive tape 10 in the supply direction of each film 4, 8 relative to the metal strip 2 is cut by cutting means 12. The cutting means 12 may be a cutter or scissors, and FIG. 2(B) shows an example in which a cutter is used as the cutting means 12. In this way, in the laminating apparatus 1 shown in FIG. 1, the film supply source relative to the metal strip 2 is switched from the leading roll 4R to the trailing roll 8R. The above-mentioned step of cutting a portion of the leading film 4 upstream of the double-sided adhesive tape 10 in the supply direction of each film 4, 8 relative to the metal strip 2 by cutting means 12 corresponds to the fourth step of this embodiment. The method of joining the leading film 4 and the trailing film 8 as described above corresponds to the film manufacturing method of this embodiment.

[0027] FIG. 3 is a cross-sectional view showing a joint 13 between the leading film 4 and the trailing film 8 joined as described above. As shown in FIG. 3, in this embodiment, the double-sided adhesive tape 10 at the joint 13 is attached to the trailing film 8 at a distance from the fixed label 9. The fixed label 9 fixes the leading end 8t of the trailing film 8 to the outer circumferential surface of the trailing roll 8 and is therefore not adhered to the leading film 4. Furthermore, the fixed label 9 protrudes downstream from the leading end 8t in the feeding direction of the films 4, 8 relative to the metal strip 2. Note that in FIG. 3, the front and rear portions of the joint 13 in the feeding direction of the films 4, 8 relative to the metal strip 2 correspond to the peripheral portions of the joint in this embodiment, and the films 4, 8 are not adhered to each other in this peripheral portion. The films 4, 8 joined via the double-sided adhesive tape 10 are supplied to the laminating device 1 shown in FIG. 1 and pressed onto the metal strip 2 to produce a laminated metal strip 6. The method of manufacturing a laminated metal strip 6 by pressure bonding films 4 and 8 to a metal strip 2 using a laminating device 1 shown in FIG. 1 corresponds to the method of manufacturing a laminated metal strip of this embodiment.

[0028] 4 is a cross-sectional view of a portion of the laminated metal strip 6 where the joint 13 shown in FIG. 3 is crimped to the metal strip 2. In the example shown in FIG. 4, the leading end 8t of the film 8 on the trailing roll 8R is directly crimped to the metal strip 2. As a result, the fixed label 9 is sandwiched between the leading film 4 and the metal strip 2, and the fixed label 9 is not exposed.

[0029] (Actions and Effects) When the leading film 4 and the following film 8 are joined together, the press roll 11 presses the edge of the double-sided adhesive tape 10 against the leading film 4. This generates a shear force where the leading film 4 makes contact with the edge of the double-sided adhesive tape 10, which may cause a portion of the leading film 4 to break at the contact area. Even if such a situation occurs, in this embodiment, the fixed label 9 is separated from the double-sided adhesive tape 10 and is sandwiched between the films 4 and 8, so exposure of the fixed label 9 can be suppressed. This also prevents the fixed label 9 from falling off. The following film 8 is pressed against the leading film 4 while wound in a roll, i.e., on the following roll 8R. Therefore, when the films 4 and 8 are joined together via the double-sided adhesive tape 10, shear force is unlikely to be generated in the following film 8, and therefore the following film 8 is unlikely to break.

[0030] Furthermore, in this embodiment, when the leading film 4 and the trailing film 8 joined as described above are pressed onto the metal strip 2 by the pressure roller 5 of the laminating device 1 shown in FIG. 1 , the leading end 8t of the trailing film 8 at the joint 13 is pressed. Therefore, shear force is unlikely to be generated in the trailing film 8, and the trailing film 8 is unlikely to break. Meanwhile, the leading film 4 at the joint 13 is pressed toward the metal strip 2 by the pressure roller 5. The thickness of the joint 13 is increased compared to the surrounding area due to the double-sided adhesive tape 10. Therefore, for example, when the pressure roller 5 presses the leading film 4 toward the joint 13 at the edge portion downstream of the joint 13 in the feeding direction of the film 4 relative to the metal strip 2, a shear force is generated in the leading film 4 due to the difference in thickness. This may cause a portion of the leading film 4 to break. Even if such a situation occurs, in this embodiment, the double-sided adhesive tape 10 and the fixed label 9 are spaced apart from each other, and the fixed label 9 is sandwiched between the films 4 and 8, so exposure of the fixed label 9 can be prevented. This also prevents the fixed label 9 from falling off, scratches on the laminated metal strip 6 caused by the fixed label 9 falling off, and defects in the appearance of the laminated metal strip 6 caused by the adhesive of the fixed label 9 adhering to a line roller (not shown) of the laminating device 1 or the periphery of the joint 13.

[0031] In this embodiment, there is a predetermined distance d between the double-sided adhesive tape 10 and the fixed label 9. Therefore, even if the adhesive of the double-sided adhesive tape 10 flows to the surrounding area when joining the leading film 4 and the following film 8, the adhesive can flow into the gap between the films 4, 8 between the double-sided adhesive tape 10 and the fixed label 9. This prevents the adhesive from being exposed. Furthermore, during pressure bonding in the laminating device 1, the metal strip 2 is at a high temperature, which can cause thermal shrinkage depending on the type of film 4, 8. This can cause the adhesive of the double-sided adhesive tape 10 to flow to the surrounding area. However, in this embodiment, there is a distance d between the double-sided adhesive tape 10 and the fixed label 9, so the above-mentioned principle can prevent the adhesive from being exposed. [Example]

[0032] Below, we will explain examples that were conducted to investigate the exposure state of the adhesive of the double-sided adhesive tape in a production line of a laminating device that press-bonds the film according to this embodiment to a metal strip. Note that this example is merely intended to explain the effects of this embodiment and does not limit the scope of the invention. In Examples 1 to 8 and Comparative Examples 1 to 3, a chromium-plated steel strip (TFS) with a thickness of 0.22 mm to 0.32 mm was used as the metal strip.

[0033] Example 1 A film made of block polypropylene with a thickness of 50 μm was wound into a roll, and the leading edge of the film (hereinafter referred to as the trailing film) at the outermost periphery of the roll (corresponding to the trailing roll described above; hereinafter referred to as the trailing roll) was fixed to the trailing roll with a fixed label configured in the same manner as in the above-described embodiment. The fixed label was formed into a square with sides of 10 mm. The leading edge of the trailing film was fixed to the trailing roll by affixing the fixed label to the leading edge of the trailing film so that the center of the fixed label and the leading edge of the trailing film at the outermost periphery of the trailing roll overlapped each other.

[0034] Next, a 50 μm thick, substrateless double-sided adhesive tape using an alkaline adhesive was attached to the outer periphery of the rolled following film at a predetermined distance from the fixed label, with the distance between the fixed label and the double-sided adhesive tape set to 2.0 mm.

[0035] The trailing roll with the double-sided adhesive tape attached was placed on the standby side of a splicing device that splices films together in a laminated metal strip production line. Then, when the remaining length of the operating roll (corresponding to the aforementioned leading roll, hereinafter referred to as the leading roll) that was unwinding a film (hereinafter referred to as the leading film) in synchronization with the chromium-plated steel strip being transported at 200 m / min became short, the standby trailing roll was rotated. When the rotational speed of the trailing roll reached approximately the same speed as the transport speed of the chromium-plated steel strip, the trailing roll was pressed against the leading film being unwound from the leading roll, splicing the leading film and the trailing film together via the double-sided adhesive tape. After the trailing roll made one rotation with the films spliced ​​together, a cutter was used to cut the leading film upstream of the double-sided adhesive tape in the film supply direction relative to the chromium-plated steel strip.

[0036] The film bonded as described above and the bonded portion between the leading film and the trailing film were then pressed and bonded to one side of a chromium-plated steel strip heated to a predetermined temperature by a pair of pressure rollers. After the film was bonded to the chromium-plated steel strip, it was immediately immersed in cooling water for rapid cooling to obtain a laminated metal strip. This laminated metal strip was produced multiple times, and the state of exposure of the adhesive of the double-sided adhesive tape, the presence or absence of curling at the leading edge of the trailing film, and the presence or absence of breakage in the leading film were each confirmed.

[0037] Table 1 summarizes the results regarding the exposure of the adhesive on the double-sided adhesive tape, whether the leading edge of the trailing film had curled, and whether the leading film had broken. In Table 1, if the leading film had broken around the periphery of the double-sided adhesive tape, exposing the fixed label or causing it to fall off, an "X" was entered in the "Fixed Label Exposure" column. If the fixed label was not exposed where the leading film had broken, an "O" was entered in the "Fixed Label Exposure" column. Furthermore, if the leading edge of the trailing film had curled at the joint between the leading and trailing films, and the trailing film had folded back and overlapped, causing a scratch on the metal strip, an "X" was entered in the "Turning of the Leading Edge of the Trailing Film" column. If the leading edge of the trailing film had curled but not caused a scratch on the metal strip, a "△" was entered in the "Turning of the Leading Edge of the Trailing Film" column. If no curling of the leading edge of the trailing film was observed, an "O" was entered in the "Curling of leading edge of trailing film" column. Furthermore, if breakage of the leading film was confirmed every time a laminated metal strip was produced, that is, if breakage of the leading film was confirmed every time, an "X" was entered in the "Film breakage" column. If breakage of the leading film was confirmed occasionally, a "△" was entered in the "Film breakage" column. If breakage of the leading film was not confirmed, an "O" was entered in the "Film breakage" column.

[0038] [Table 1]

[0039] (Examples 2 to 8, Comparative Examples 1 to 3) A laminated metal strip was obtained in the same manner as in Example 1, except that the type and thickness of the film, the type and thickness of the double-sided adhesive tape, and the distance between the fixed label and the double-sided adhesive tape were changed as shown in Table 1.

[0040] In the laminated metal strips obtained in Examples 1 to 8, the distance between the fixed label and the double-sided adhesive tape was 1 mm or more. Therefore, even if the leading film broke, the exposure of the fixed label could be suppressed. This suppressed appearance defects, such as scratches on the laminated metal strip caused by the fixed label. Furthermore, the laminated metal strips obtained in Examples 7 and 8 had thinner double-sided adhesive tape than those in Examples 1 to 6. Therefore, the thickness of the joint, i.e., the area where the leading film, the following film, and the double-sided adhesive tape overlap, was thinner than the joints in Examples 1 to 6. This suppressed breakage of the leading film due to the difference in thickness between the joint and its surrounding area when joining films together or attaching a film to the metal strip. Therefore, it was found that using a thin double-sided adhesive tape is advantageous from the perspective of suppressing exposure of the fixed label.

[0041] On the other hand, the laminated metal strips obtained in Comparative Examples 1 and 2 had a gap between the fixed label and the double-sided adhesive tape narrower than the range specified in this embodiment. Specifically, in Comparative Examples 1 and 2, the double-sided adhesive tape was attached so as to overlap at least a portion of the fixed label. Therefore, when joining films together or attaching a film to the metal strip, there was a large difference in thickness between the joint and its surrounding area, which resulted in shear force and breakage of the leading film. The fixed label was then exposed or removed from the broken portion of the leading film, leading to scratches and appearance defects on the laminated metal strip. Furthermore, the laminated metal strip obtained in Comparative Example 3 had a gap between the fixed label and the double-sided adhesive tape wider than the range specified in this embodiment. Therefore, curling of the leading edge of the trailing film was observed. [Explanation of symbols]

[0042] 1. Laminating device 2 Metal Strips 3 Heating device 4 Film (advance film) 4R Leading Roll 5. Crimping roll 6. Laminated metal strip 7 Cooling equipment 8 Trailing Film 8R Trailing Roll 8t Leading edge of trailing film 9 Fixed Labels 10 double-sided adhesive tape 11 Press Roll 12 Cutting means 13 Joint

Claims

1. A film roll in which a film to be joined to another film is wound into a roll, a fixed label for fixing the leading end of the film to the outer peripheral surface; The film roll has the fixed label and a double-sided adhesive tape attached to the outer peripheral surface at a distance from each other.

2. 2. The film roll according to claim 1, wherein the distance between the double-sided adhesive tape and the fixed label in the film unwinding direction is 1.0 mm or more and 20.0 mm or less.

3. 3. The film roll according to claim 1, wherein the double-sided adhesive tape has a thickness of 10 μm or more and 100 μm or less.

4. A laminated metal strip in which the film unwound from the film roll according to claim 1 or 2 is attached to at least one of both surfaces of a metal strip, a leading film attached to the metal strip prior to the film; and a joining portion where the film is joined to the leading film via the double-sided adhesive tape, A laminated metal strip, in which the leading end of the film is attached to one surface of the metal strip.

5. A laminated metal strip in which the film unwound from the film roll according to claim 3 is attached to at least one of both surfaces of a metal strip, a leading film attached to the metal strip prior to the film; and a joining portion where the film is joined to the leading film via the double-sided adhesive tape, A laminated metal strip, in which the leading end of the film is attached to one surface of the metal strip.

6. A method for manufacturing a film that is continuously supplied and attached to at least one of both surfaces of a metal strip, comprising: a first step of attaching a double-sided adhesive tape to the outer peripheral surface of a trailing film roll having a trailing film wound in a roll shape, the trailing film having a leading end fixed to the outer peripheral surface by a fixed label and spaced apart from the fixed label; a second step of synchronizing the feeding speed of the leading film, which is fed to the metal strip ahead of the trailing film, with the speed of the outermost peripheral portion of the roll-like trailing film; a third step of joining the following film to the preceding film via the double-sided adhesive tape; a fourth step of cutting the preceding film at a portion of the preceding film upstream of the double-sided adhesive tape in the direction in which the film is fed relative to the metal strip.

7. The method for producing a film according to claim 6 , wherein in the first step, the distance between the double-sided adhesive tape and the fixed label is set to be 1.0 mm or more and 20.0 mm or less.

8. A method for producing a laminated metal strip, comprising attaching a film produced by the method for producing a film according to claim 6 or 7 to one surface of the metal strip to produce a laminated metal strip.

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