Apparatus and method for peeling coating from coated film

Abstract

To provide a coating peeling device and a coating peeling method which can stably peel a coating from a film with a coating without re-attaching the peeled coating to the film.SOLUTION: A peeling device includes: a scraping device having a scraping part which has a ridge line extending in a film width direction, where a surface positioned on an upstream side in a film travel direction out of two surfaces forming the ridge line is directed downward in a vertical direction as being separated from the ridge line, and the ridge line is arranged so as to be brought into contact with the surface of a coating of the film with the coating, and a receiving part which has a recessed surface extending in a film width direction for receiving the coating peeled from the film with the coating, where the recessed surface is arranged so as to be connected to a surface positioned on the upstream side in a film travel direction out of the two surfaces forming the ridge line; and a supply device for supplying a gas or liquid toward the other end from one end in the film width direction, along the recessed surface of the receiving part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a peeling device and a peeling method that can efficiently remove a coating from the surface of a coated film. [Background technology]

[0002] In recent years, efforts have been made to reduce the environmental impact of plastics and make effective use of resources by separating the film from the coating of used coated films and reusing the film. When reusing film, it is generally desirable to completely separate the film and the coating, since the components that make up the film and the components that make up the coating are different compositions. If separation of the film and the coating is insufficient and film still contains the components that make up the coating is remelted as is to produce recycled film, the components that make up the coating will become foreign matter, destabilizing the film production process and causing a decline in film quality, significantly reducing both production efficiency and production quality.

[0003] Patent Document 1 discloses a method for peeling off a release layer from a release film and separating it from the film, in which a release film having a water-soluble resin layer formed between the base film and the release layer is used, water is applied to the release film by immersing it in a water tank, and then the release layer is peeled off with a rotating brush.

[0004] Patent Document 2 discloses a method for peeling ceramic green sheet layers from a carrier sheet used in the MLCC (multilayer ceramic capacitor) manufacturing process and separating the carrier sheet, in which the ceramic green sheet layers are peeled off using blades attached to the outer periphery of a rotating shaft perpendicular to the running direction of the film. It also discloses a method for recovering the peeled ceramic green sheet layers using an airflow generated by the rotating blade. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-363140 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-56675 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in Patent Document 1, the peeled coating floats in the water tank, reattaches to the film, and is transported to a downstream process, resulting in problems such as the coating contaminating the recovered film or contaminating the rolls in the downstream process. Furthermore, the peeled coating adheres to the rotating brush, causing the brush's peeling ability to decrease over time. These problems become more pronounced as the film travel speed increases, so to resolve them, it is necessary to periodically clean the equipment, slow down the film travel speed, and shorten the length of film processed per run. This significantly reduces the peeling processing capacity per unit time, making the peeling processing less efficient.

[0007] Furthermore, in Patent Document 2, the peeled coating becomes fine dust due to the abrasion of the rotary blade, which easily scatters and becomes electrically charged. Therefore, depending on the type of peeled coating, the dust may be blown up by the air current generated by the rotation of the rotary blade and re-adhere to the film or peeling device. This problem becomes more pronounced as the rotation speed of the rotary blade increases, so to solve it, it is necessary to slow down the rotation speed of the rotary blade. This significantly reduces the peeling processing capacity per unit time, making it impossible to perform the peeling processing efficiently.

[0008] As described above, in a peeling device that peels a coating from one side of a traveling film, no peeling device has been found that can prevent the peeled coating from re-adhering to the film and peel the coating from the film while maintaining peeling ability, even when the amount of peeled coating increases with the passage of processing time or an increase in the film traveling speed.

[0009] Therefore, the present invention provides a coating peeling device and a coating peeling method that can prevent the peeled coating from re-adhering to the film and can stably peel the coating from the coated film even during high-speed, long-term peeling processing. [Means for solving the problem]

[0010] The apparatus for peeling a coating from a coated film of the present invention, which solves the above-mentioned problems, is an apparatus for peeling a coating from a coated film in which a coating is formed on one side of a traveling base film, and includes the following steps: an apparatus for scraping the coating from the coated film, comprising: a scraping unit having a ridgeline extending in the width direction of the film, the surface of the two surfaces forming the ridgeline that is located upstream in the film running direction tends to move vertically downward as it moves away from the ridgeline, and the ridgeline is positioned so as to come into contact with the coating surface of the coated film; a receiving portion having a concave surface extending in the film width direction for receiving the coating peeled from the coated film, the concave surface being continuous with the surface of the two surfaces forming the ridge line that is located upstream in the film running direction; a scraping device having a supply device that supplies gas or liquid from one end of the film width direction toward the other end along the concave surface of the receiving portion; It has.

[0011] The peeling device of the present invention preferably has any one of the following aspects. The vertical distance from the ridge to the bottom of the concave surface is 150 mm or less. Of the two surfaces that form the ridgeline, the surface located upstream in the film running direction is bent or curved toward the downstream in the film running direction on the way from the ridgeline to the concave surface. A cleaning liquid applying device is provided upstream of the scraping device in the film running direction, which applies cleaning liquid toward the coating surface of the coated film.

[0012] However, the configuration of the peeling device of the present invention does not include a base film or a coated film.

[0013] The method of peeling a coating from a coated film of the present invention, which solves the above problems, comprises: A coated film having a coating formed on one side of a substrate film is run, and the coating is peeled off from the substrate film; The peeled coating is then peeled off in a direction that is directed downward in the vertical direction as it moves away from the base film. surface After flowing along the Vertically downward the surface is received by a concave surface connected to the surface, and the surface is captured at a location spaced apart from the base film, The captured film is collected by fluidizing it with a gas or liquid.

[0014] The peeling method of the present invention is preferably in any one of the following modes. After applying a cleaning solution to the coating surface of the coated film, the coating is peeled off. The coating contains a water-soluble resin. The coating contains a curable silicone resin. [Effects of the Invention]

[0015] By using the coating peeling device of the present invention, even when the film running speed is increased and the peeling process is carried out over a long period of time, the peeled coating does not get mixed into the recovered film, and the coating can be stably peeled from the coated film. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic diagram of a delamination device 100 according to a first embodiment of the present invention. [Figure 2] 1A and 1B are a schematic cross-sectional view of a stripping device 100 and a view showing a state in which a coating is stripped using the stripping device 100. FIG. [Figure 3] FIG. 2 is a schematic diagram of a stripping device 200 according to another embodiment of the present invention. [Figure 4] 1 is a schematic diagram showing a film recovery device 4 of the present invention. [Figure 5] FIG. 3 is a schematic diagram of a peeling device 300 different from the present invention. [Figure 6] FIG. 4 is a schematic diagram of a conventional film recovery device 400. [Figure 7] 6 is a schematic diagram of the stripping device 300 of FIG. 5 and a view showing a state in which a coating is stripped using the stripping device 300. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] The preferred embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments shown in the drawings, and various modifications are possible within the scope of the invention, which can achieve the object of the invention and does not deviate from the gist of the invention.

[0018] In the following description, the terms "film running direction," "film width direction," and "vertical direction" refer to directions in which the coating is peeled from the coated film using the peeling device of the present invention.

[0019] Please refer to Figure 1. Figure 1 is a schematic diagram of one embodiment of a peeling apparatus 100 of the present invention. This peeling apparatus 100 includes a scraping device 110 and a supplying device 120 that supplies gas or liquid to fluidize the captured coating. The scraping device 110 has a ridge 101 that contacts the coating surface of the coated film, and includes a scraping section 111 that peels the coating from the coated film, and a receiving section 112 that has a concave surface 102 for receiving the coating peeled from the coated film. Of the two surfaces that form the ridge 101, an inclined surface 103 located upstream in the film running direction is arranged so that it slopes vertically downward as it moves away from the ridge 101, and the concave surface 102 is continuous with this inclined surface 103. The supply device 120 is also provided with a supply port 121 for supplying gas or liquid along the film width direction (defined as the x-axis direction) of the concave surface 102, and this supply port 121 is arranged in contact with one end of the concave surface 102 in the x-axis direction. Furthermore, a recovery device (not shown) for recovering the flowed coating is arranged at the other end. Here, the direction parallel to the ridge line 101 is defined as the x-axis direction, the vertical direction as the z-axis direction, and the direction perpendicular to the x-axis and z-axis directions as the y-axis direction.

[0020] Next, the manner in which the peeling device 100 of the present invention is used to peel a coating from a coated film, capture the peeled coating, and recover it without re-adhering to the substrate film will be described in detail with reference to FIG.

[0021] Please refer to Figure 2. Figure 2 is a schematic cross-sectional view of a peeling device 100 of the present invention and a diagram showing the state in which a coating is peeled using the peeling device 100. First, the coated film 1 and the peeling device 100 come into contact with the coating surface of the coated film 1 at ridge line 101, and the coating is peeled from the coated film 1, separating the substrate film 2 and the peeled coating 3. The peeled coating 3 slides or falls in the z-axis direction along inclined surface 103 parallel to the z-axis direction due to the gravity of the peeled coating 3, and is captured by receiving portion 112. At this time, because concave surface 102 is connected to inclined surface 103, the peeled coating 3 easily slides from inclined surface 103 to concave surface 102 and can be captured by receiving portion 112. The peeled coating 3 captured in the receiver 112 flows in the x-axis direction along the concave surface 102 due to gas or liquid supplied from the supply port 121 of the supply device 120, from the rear of the concave surface 102 in the x-axis direction toward the front, and is collected in a collection device (not shown) installed at the end opposite the supply port 121. As a result, the peeled coating 3 does not reattach to the substrate film 2 separated at the ridge line 101, so that the peeled coating 3 does not get mixed into the collected film. To prevent the peeled coating 3 from remaining on the slope 103 and being collected immediately, the upper limit of the length L1 in the z-axis direction from the ridge line 101 to the bottom of the concave surface 102 is preferably 150 mm or less, more preferably 50 mm or less. The lower limit of L1 is not particularly limited, but a practical dimension for forming the ridge line 101 is preferably 4 mm or more. To prevent the peeled coating 3 sliding down the slope 103 from re-adhering to the coated film 1 and thereby reducing recovery efficiency, it is preferable that the angle (acute angle) between the slope 103 and the coated film 1 be 10° or more, and that the coated film 1 be spaced apart from the slope 103. To capture all of the peeled coating 3 on the concave surface 102, it is preferable that the coated film 1 be brought into contact with the peeling device 100 only at the ridge 101, and that the coated film 1 and the receiving part 112 be installed so that they do not come into contact with each other.

[0022] The supply device 120 supplies a gas or liquid from a supply port 121 of the supply device 120 along the concave surface 102. When supplying a gas, a compressor, a blower, or the like is connected to the supply device 120. When supplying a liquid, a liquid pump or a means for supplying a liquid by air pressure is connected to the supply device 120. The supply method is not limited to these methods and can be selected arbitrarily depending on the type and amount of gas or liquid to be supplied. The amount of gas or liquid supplied is preferably set to a wind speed of 5 m / s or more along the film width direction of the concave surface 102 in the case of a gas, or a flow speed of 0.01 m / s or more along the film width direction of the concave surface 102 in the case of a fluid, in order to cause the peeled coating 3 captured on the concave surface 102 to flow. The fluid to be supplied can be selected arbitrarily, but if the peeled coating 3 is prone to scattering because it is dusty, for example, it is preferable to supply a liquid from the supply device 120. Therefore, in the peeling device 100 of the present invention, the peeled coating 3 can be continuously moved away from the ridge line 101, and the peeled coating 3 does not accumulate in the scraping section 111, so that the peeling ability of the peeling device 100 does not decrease even as processing time passes when peeling at high speed.

[0023] Please refer to Figure 3. Figure 3 is a schematic diagram of a peeling device 200, another embodiment of the present invention. In the configuration of the peeling device 100 in Figure 1, if the length L1 in the z-axis direction from the ridge line 101 to the bottom of the concave surface 102 is shortened to make it easier to collect the peeled coating 3, the coated film 1 traveling upstream of the ridge line 101 in the film traveling direction may come into contact with the receiving portion 112. An embodiment that can avoid this is the peeling device 200. In the scraping portion 211 of the peeling device 200, the inclined surface 203, which is one of the two surfaces that form the ridge line 201 and is located upstream in the film traveling direction, is bent in the y-axis direction toward the downstream side in the film traveling direction midway from the ridge line 201 toward the concave surface 202. This minimizes the protrusion of the receiving portion 212 upstream in the y-axis direction relative to the ridge line 201 in the film running direction. Therefore, the traveling coated film 1 does not come into contact with the receiving portion 212 on the upstream side of the ridge line 201 in the film running direction, and the z-axis length L2 from the ridge line 201 to the bottom of the concave surface 202 can be shortened. This prevents the peeled coating 3 from remaining on the inclined surface 203 and allows it to be quickly collected. To prevent the peeled coating from reattaching to the substrate film, the upper limit of the z-axis length L' of the inclined surface 203 from the ridge line 201 to the bent portion is preferably 100 mm or less, more preferably 30 mm or less. While the lower limit of L' is not particularly limited, a realistic dimension for forming the ridge 201 is preferably 0.05 mm or more. Furthermore, the inclined surface 203 may be curved rather than bent midway from the ridge line 201 to the concave surface 202.

[0024] As described above, by using the peeling device of the present invention, even when the film running speed is increased and the peeling process is performed for a long time, the peeled coating can be stably peeled from the coated film without being mixed into the recovered film.

[0025] In the peeling device 100 (200), the scraping device 110 (210) and the supplying device 120 (220) are preferably configured as separate members, but may be integrated. Also, in the scraping device 110 (210), the scraping portion 111 (211) and the receiving portion 112 (212) are preferably integrated as the same member.

[0026] Next, a film recovery device 4 that uses the peeling device 100 of the present invention to peel the coating from the coated film and recover the base film will be described with reference to Figure 4. Figure 4 is a schematic diagram showing an example of the film recovery device 4 of the present invention.

[0027] The film recovery device 4 is equipped with an unwinding section 5 that unwinds the coated film 1 and a winding section 6 that winds up the base film 2 after the coating has been peeled off from the coated film 1. Between the unwinding section 5 and the winding section 6 are provided drive devices 9 and 10 for transporting the coated film 1, a cleaning liquid application device 7 that ejects cleaning liquid toward the coating surface of the coated film 1, a peeling device 100 for peeling the coating off the coated film 1, and an appearance inspection device 11 that inspects whether the peeled coating has re-adhered to the base film 2. Of these, the cleaning liquid application device 7 and the peeling device 100 are enclosed in a booth 8.

[0028] Furthermore, as a cleaning liquid discharge mechanism, a liquid sending pump 12 for sending the cleaning liquid to the cleaning liquid deposition device 7 and a tank 13 for storing the cleaning liquid are provided.

[0029] The cleaning liquid application device 7 may be any device capable of applying a cleaning liquid to the coating surface of the traveling coated film 1, and examples thereof include, but are not limited to, a shower, a spray nozzle, and a water tank containing cleaning liquid. Furthermore, to improve cleaning efficiency, the cleaning liquid application device 7 is preferably capable of discharging heated cleaning liquid, and is particularly preferably capable of discharging cleaning liquid heated to 40°C or higher. Methods for heating the cleaning liquid include, but are not limited to, providing a heat source in the cleaning liquid application device 7 or heating the tank 13 that stores the cleaning liquid. Because the cleaning liquid application device 7 discharges heated cleaning liquid, the material of the cleaning liquid application device 7 is preferably metal or a heat-resistant resin.

[0030] Furthermore, in order to accommodate the coating of the coated film wound into a roll on either the inside or outside of the roll, it is preferable that the unwinding section 5 has a mechanism that can switch the unwinding direction of the coated film 1 so that the coated surface of the coated film 1 runs opposite the cleaning liquid application device 7 and the peeling device 100, allowing it to be unwound either from above or below.

[0031] Booth 8 of film recovery device 4 is arranged to enclose the area from cleaning liquid applicator 7 to peeling device 100 in order to prevent the cleaning liquid discharged from cleaning liquid applicator 7 from scattering around and to prevent the temperature of the heated cleaning liquid from dropping. Booth 8 is preferably heat resistant because it is heated by the heated cleaning liquid, and is preferably made of a material such as metal or glass.

[0032] Next, the method of peeling a coating from a coated film of the present invention will be described again with reference to FIG. 4 . The coated film 1 is transported through the booth 8 by the drive device 9, and a cleaning solution is dispensed from the cleaning solution dispenser 7 toward the coating surface of the coated film 1. The coated film 1 is then brought into contact with the peeling device 100, and the coating of the coated film 1, along with the cleaning solution, is peeled off from the substrate film 2, and the substrate film 2 is taken up by the take-up unit 6. Meanwhile, in the peeling device 100, the peeled coating flows along a slope that slopes downward in the vertical direction as it moves away from the substrate film 2. It is captured by a concave surface connected to the slope, and then is fluidized by gas or liquid and collected. This prevents the coating peeled from the coated film 1 from reattaching to the substrate film 2 and prevents the peeled coating from being mixed into the collected film. The amount of gas or liquid supplied to fluidize the peeled coating is adjusted depending on the flow pattern of the peeled coating. If the flow of the peeled coating is insufficient and the peeled coating accumulates in the peeling device 100, the amount of gas or liquid supplied is increased, and if the flow of the peeled coating is excessive and the peeled coating scatters, the amount of gas or liquid supplied is decreased.

[0033] Furthermore, to prevent the removal of foreign matter such as a peeled coating from contaminating the recovered film and degrading its quality, it is preferable to provide a means for inspecting for the presence of foreign matter such as a peeled coating after the coating is peeled off from the coated film 1 by the peeling device 100. If foreign matter is detected, the operation of the film recovery device 4 can be stopped and the cause of the foreign matter adhesion can be removed by cleaning the peeling device 100 and the roll, thereby minimizing the loss of recovered film. An example of a means for inspecting for the presence of foreign matter is monitoring using a line camera, but this is not limited to this.

[0034] The coating of the coated film is preferably a coating containing a water-soluble resin in consideration of environmental impact, etc. Among these, the water-soluble resin is more preferably one containing at least one of water-soluble polyester resins, polyester urethane resins, acrylic resins, ethylene ionomer resins, polyvinyl alcohol resins, polyvinylpyrrolidone resins, ethylene-vinyl alcohol resins, and starch as the main component. The coating containing a water-soluble resin may be a single layer containing a water-soluble resin, a laminate of two or more layers containing a water-soluble resin, or a laminate of a layer containing a water-soluble resin and a layer not containing a water-soluble resin.

[0035] Furthermore, it is preferable that a part of the coating contains a curable silicone resin in addition to the water-soluble resin. The coating may be a mixture of the water-soluble resin and the curable silicone resin, or may be a laminate of each of these layers. In the case of a laminated coating, it is preferable that a layer containing the water-soluble resin is present directly on the substrate film, and a layer containing the curable silicone resin is formed on the outermost surface. It is particularly preferable to use a curable silicone resin compound having a main skeleton of dimethylsiloxane, which has high water permeability, as the curable silicone resin. [Example]

[0036] The present invention will be described in more detail below with reference to examples.

[0037] <Coated film> A 0.1 μm thick layer of polyvinyl alcohol resin was applied as a water-soluble resin onto a 25 μm thick polyethylene terephthalate substrate film, and a 0.1 μm thick layer of curable silicone resin was applied as a release component on top of that to produce a coated film.

[0038] <Method for evaluating foreign matter contamination in recycled film> The presence or absence of foreign matter in the recovered film was evaluated for (1) contamination due to insufficient coating removal, and (2) contamination due to reattachment of the peeled coating. Evaluation of (1) was performed using a commercially available mixture for wetting tension testing (manufactured by Kanto Chemical Co., Inc., surface energy: 30.0, 65.0 mN / m) using the following method.

[0039] In an environment at room temperature of 23°C, a cotton swab was impregnated with the mixture for the wet tension test, and the mixture for the wet tension test was applied to the surface of the recovered film with the cotton swab. If the applied state was maintained for 4 seconds or more, it was determined that the surface energy of the recovered film was higher than the surface energy of the mixture for the wet tension test.

[0040] If the curable silicone resin release component remains on the surface of the coated film, the surface energy of the recovered film surface will be less than 30 mN / m, and therefore any of the mixed liquids for the wetting tension test will be repelled by the recovered film surface and will not be able to remain applied.

[0041] On the other hand, if the coating of the curable silicone resin, which is the release component, is peeled off and the polyvinyl alcohol resin remains on the surface of the coated film, the surface energy of the recovered film is 65 mN / m or more, and therefore any of the mixed liquids for the wetting tension test can be maintained in a coated state on the surface of the recovered film.

[0042] Furthermore, if both the curable silicone resin and polyvinyl alcohol resin release components have been peeled off and the base film is exposed on the surface of the recovered film, the recovered film surface is polyethylene terephthalate, so the surface energy is 43.8 mN / m, and the applied state of the wet tension test mixture liquid of 30 mN / m is maintained, but the applied state of the wet tension test mixture liquid of 65 mN / m is not maintained. Using the above evaluation method, it was determined whether the coating of the coated film was able to be peeled off.

[0043] On the other hand, for evaluation (2), the behavior of the peeled coating was visually observed to confirm whether or not the peeled coating reattached to the base film. In addition, a line camera installed between the peeling device and the winding section was used to count the number of peeled coatings that reattached to the base film and were brought to the winding section, and the number of peeled coatings that were brought to the recovered film per 100 m of film travel was calculated from the film running speed and running time to determine whether or not the reattachment of peeled coatings into the recovered film was suppressed.

[0044] <Removing the coating from a coated film> [Example 1] The coating of the coated film was peeled off using the film recovery device 4 of Figure 4 equipped with the peeling device 100. The length L1 in the z-axis direction from the ridge 101 of the peeling device 100 to the bottom of the concave surface 102 was set to 50 mm, and water was supplied to the concave surface 102 from the supply device 120 at 0.02 m / s. The coating peeling procedure involved running the film at a running speed of 20 m / min, spraying water (temperature: 80°C) as a cleaning liquid onto the coating surface of the coated film using a shower, and then peeling off the coating of the coated film using the peeling device 100. The amount of water sprayed from the shower was set to 1 / 10 m per unit area of ​​the coated film. 2 The volume was 30 mL per

[0045] [Example 2] The coating of the coated film was peeled off under the same conditions as in Example 1, except that the length L1 in the z-axis direction from the ridge line 101 to the bottom of the concave surface 102 was set to 180 mm.

[0046] [Example 3] The coating of the coated film was peeled off under the same conditions as in Example 1, except that the film running speed was set to 50 m / min.

[0047] [Example 4] The coating of the coated film was peeled off using the peeling device 200. The coating of the coated film was peeled off under the same conditions as in Example 1, except that the length L2 in the z-axis direction from the ridge line 201 of the peeling device 200 to the bottom of the concave surface 102 was set to 180 mm, and the length L' in the z-axis direction from the ridge line 201 to the bent point was set to 10 mm.

[0048] [Comparative Example 1] The coating of the coated film was peeled off using a peeling device 300 shown in Figure 5. The peeling device 300 is composed only of a member equivalent to the scraping unit 111 of the peeling device 100, and does not include the receiving unit 112 or the supply device 120. The length L3 of the inclined surface 303 in the z-axis direction was set to 50 mm. Using this peeling device 300, the coating of the coated film was peeled off under the same conditions as in Example 1.

[0049] Comparative Example 2 The coating of a coated film was removed using a conventional film recovery device 400 shown in Figure 6. The film recovery device 400 includes a water tank 414 containing water, which serves as a cleaning solution, and brush rolls 415 and 415' that scrape the surface of the coated film to remove the coating. The coating removal procedure involved placing the coated film in the unwinding device 404 of the film recovery device 400, running the film at a speed of 20 m / min, and passing through the water tank 414 to contact the water (temperature: 20°C), which serves as a cleaning solution. The brush rolls 415 and 415' then removed the coating from the coated film. The film then passed through a cleaning device 416 and a water droplet removal device 417, after which the substrate film was wound up by a winding device 405. Because the water-soluble polyvinyl alcohol resin contained in the coating elutes, increasing the solution concentration and reducing the elution rate of the polyvinyl alcohol resin, fresh cleaning solution was continuously supplied to the water tank. To continuously peel off the coating, the unit area of ​​the coated film must be 1.0 m2 It was necessary to supply 25,000 mL of cleaning solution per unit.

[0050] Table 1 shows the results of coating peeling from the coated films in the above examples and comparative examples. Regarding whether or not the coating could be peeled off in the table, "coating peeled off" indicates that both the polyvinyl alcohol resin and the curable silicone resin, which are coatings on the substrate film, were peeled off from the substrate film, and the coated film was separated into the coating and the substrate film. Furthermore, "coating partially remaining" indicates that, of the coating on the substrate film, only the curable silicone resin located on the surface layer was peeled off, and the polyvinyl alcohol resin remained on the substrate film and was not separated from the substrate film. Furthermore, "coating remaining" indicates that both the polyvinyl alcohol resin and the curable silicone resin, which are coatings on the substrate film, remained on the substrate film, and the coating was not separated from the substrate film.

[0051] [Table 1]

[0052] [Comparison between Example 1 and Comparative Example 1] In Comparative Example 1, which did not have a concave surface 102, reattachment of the peeled coating to the substrate film was confirmed. In contrast, in Example 1, the coating peeled off at the ridge line 101 was captured by the concave surface 102 and then collected by the flowing water, preventing the peeled coating from reattaching to the substrate film. The reason for the reattachment of the peeled coating in Comparative Example 1 will be explained with reference to FIG. 7. FIG. 7 is a schematic diagram of the peeling device 300 and a diagram showing the state of coating peeling using the peeling device 300. The peeled coating 3 flows downward in the z-axis direction along the inclined surface 303. However, because the peeled coating 3 is viscous, it does not fall from the bottom of the peeling device 300 in the z-axis direction, but accumulates between the inclined surface 303 and the coated film 1. As the processing time progresses, the accumulated peeled coating 3 does not fit within the widthwise inner dimensions of the coated film 1 and flows out beyond the film width. It was then observed that the peeled coating 3 that had flowed outward beyond the film width re-adhered to the side and back surfaces of the coated film 1.

[0053] [Comparison between Example 1 and Comparative Example 2] In Example 1, the coating peeling performance did not decrease with the passage of treatment time, and the peeled coating did not re-adhere to the substrate film. On the other hand, in Comparative Example 2, the coating peeling performance was good at the beginning of peeling, but as treatment time passed, the peeled coating accumulated on the brush roll, causing clogging of the brush, and it was confirmed using a wetting reagent that the polyvinyl alcohol resin gradually remained (part of the coating remained). As treatment time continued, clogging of the brush roll progressed further, the coating peeling ability decreased significantly, and the coating remained. Furthermore, it was confirmed that part of the peeled coating that had accumulated on the brush roll re-adhered to the film.

[0054] [Comparison between Examples 1 and 2] In Example 1, by shortening the length from the ridge to the bottom of the concave surface, the peeled coating could be quickly collected at the receiving part, and the re-adhesion of the peeled coating could be reduced. In Example 2, although the peeled coating did re-adhere, the amount of re-adhesion was sufficiently suppressed.

[0055] [Comparison between Examples 1 and 3] It was confirmed that the peeled coating did not re-adhere to the substrate film while peeling the coating in both Examples 1 and 3. Therefore, it was confirmed that the use of the peeling device 100 can prevent the peeled coating from re-adhering to the substrate, regardless of the peeling speed.

[0056] [Comparison between Examples 2 and 4] In Examples 2 and 4, the length from the ridge to the bottom of the concave surface is the same. However, in Example 4, of the two surfaces forming the ridge, the surface located upstream in the film running direction is bent toward the downstream side in the film running direction on its way from the ridge to the concave surface. As a result, it was confirmed that the peeled coating flows along the bent slope and moves away from the running coated film, preventing the peeled coating from re-adhering to the substrate. [Industrial Applicability]

[0057] The present invention can be applied to an apparatus and method for peeling a coating from a coated film in which a coating is formed on one side of a base film such as resin, paper, metal thin film, or cloth, but is not limited to this. [Explanation of symbols]

[0058] 1 Coated film 2. Base film 3 Peeled off coating 4,400 film recovery device 5 Unwinding section 6 Winding section 7. Cleaning liquid application device 8 Booths 9, 10 Drive unit 11 Visual inspection equipment 12 Liquid transfer pump 13. Tank 100, 200, 300 peeling device 101, 201, 301 ridgelines 102, 202 concave 103, 203, 303 slopes 110, 210 scraping device 111, 211 scraping section 112, 212 Receptacle 120, 220 feeding device 121, 221 supply port 404 Unwinding device 405 Winding device 414 Aquarium 415, 415' Brush Roll 416 Cleaning Equipment 417 Water droplet removal device L1, L2: Z-axis length from the ridge to the bottom of the concave surface L3 Length of the slope in the z-axis direction L': The length in the z-axis direction from the ridge to the bent point

Claims

1. An apparatus for peeling a coating from a coated film having a coating formed on one side of a traveling substrate film, comprising: an apparatus for scraping the coating from the coated film, comprising: a scraping section having a ridgeline extending in the width direction of the film, the surface of which that is located upstream in the film running direction of the two surfaces that form the ridgeline moving downward in the vertical direction as it moves away from the ridgeline, and the ridgeline being positioned so as to come into contact with the coating surface of the coated film; a receiving portion having a concave surface extending in the film width direction for receiving the coating peeled from the coated film, the concave surface being continuous with the surface of the two surfaces forming the ridge line that is located upstream in the film running direction; a scraping device having a supply device that supplies gas or liquid from one end of the film width direction toward the other end along the concave surface of the receiving portion; An apparatus for peeling a coating from a coated film, comprising:

2. 2. The apparatus for peeling a coating from a coated film according to claim 1, wherein the vertical distance from the ridge to the bottom of the concave surface is 150 mm or less.

3. 3. The apparatus for peeling a coating from a coated film according to claim 1 or 2, wherein the surface located upstream in the film running direction of the two surfaces forming the ridge line is bent or curved toward the downstream in the film running direction midway from the ridge line toward the concave surface.

4. 4. The apparatus for peeling a coating from a coated film according to claim 1, further comprising a cleaning liquid application device disposed upstream of the scraping device in the film running direction, the cleaning liquid application device discharging a cleaning liquid toward the coating surface of the coated film.

5. A coated film having a coating formed on one side of a substrate film is run, and the coating is peeled off from the substrate film; The peeled coating is allowed to flow along a surface that moves downward in the vertical direction as it moves away from the base film, the flowed coating is received by a concave surface connected to the surface directed downward in the vertical direction, and is captured at a location spaced apart from the base film; The captured coating is collected by fluidizing it with a gas or liquid. A method for removing a coating from a coated film.

6. 6. The method for peeling a coating from a coated film according to claim 5, wherein the coating is peeled off after a cleaning liquid is applied to the coating surface of the coated film.

7. 7. The method of peeling a coating from a coated film according to claim 6, wherein the coating comprises a water-soluble resin.

8. The method for removing a coating from a coated film according to any one of claims 5 to 7, wherein the coating comprises a curable silicone resin.

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