Film Cleaning Equipment

Abstract

To provide a film washing device capable of keeping cost of washing liquid low by increasing a washing liquid recovery ratio without damaging a film.SOLUTION: A film washing device includes an ink peeling unit 3A for causing washing liquid L1 to adhere to a film W1, and peeling ink from the film W1, a washing liquid recovery unit 3B for recovering the washing liquid L1 caused to adhere to the film W1 by the ink peeling unit 3A, and a water-washing unit for water-washing the film W1, which are provided sequentially in a film conveying direction. The washing liquid recovery unit 3B includes a washing liquid suction roll 30 in which an outer peripheral layer made of non-woven fabric comes in contact with the film W1 while rotating. The washing liquid suction roll 30 sucks the washing liquid L1 that is caused to pass through a gap of the non-woven fabric by a first vacuum unit and adhere to the film W1 into the inside of a rotary shaft.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a film cleaning device that uses a cleaning liquid to clean and remove ink adhering to a continuously transported film. [Background technology]

[0002] Conventionally, when printing is performed using a gravure printing machine or the like, there has been a problem that films that are used to adjust the positions of each color in printing and are not used as products have ink attached thereto, making them difficult to reuse or recycle. In order to address this problem, in recent years, efforts have been made to use a film cleaning device to clean and remove ink attached to the film with a cleaning liquid, and then to reuse the film from which the ink has been removed. For example, the film cleaning device disclosed in Patent Document 1 includes a first storage tank in which a cleaning liquid is stored, and the film to which ink is attached is passed while being immersed in the cleaning liquid in the first storage tank to dissolve the ink. A pair of wiper blades are disposed above the first storage tank, each of which contacts the front and back surfaces of the continuously transported film, and each wiper blade passes through the first storage tank to scrape off the cleaning liquid containing the ink attached to the front and back surfaces of the film, and returns it to the first storage tank. A second storage tank containing water is provided downstream of both wiper blades in the film transport direction, and the film is passed through the second storage tank while immersed in the water, so that the ink dissolved by the cleaning fluid is washed away by the water and removed from the film. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2017 / 0313056 (paragraphs 0084-0089, Figure 6) Summary of the Invention [Problem to be solved by the invention]

[0004] However, the cleaning liquid that dissolves the ink as described above is expensive, and there is a demand for recovery and reuse of as much of it as possible.

[0005] However, in the method of using a wiper blade to scrape off and recover the cleaning liquid adhering to the film, as in Patent Document 1, the amount of cleaning liquid scraped off by the wiper blade varies depending on factors such as the film transport speed and the dissolution state of the ink, resulting in a low recovery rate of the cleaning liquid.

[0006] In addition, when the cleaning liquid adhering to the film is scraped off with a wiper blade, small clumps of ink contained in the cleaning liquid may be rubbed onto the film surface, scratching the film and making it difficult to reuse the film.

[0007] The present invention has been made in consideration of these points, and its object is to provide a film cleaning device that can increase the recovery rate of cleaning liquid without damaging the film, thereby reducing the cost spent on cleaning liquid. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention is characterized in that the cleaning liquid adhering to the film is removed by using a nonwoven fabric and a suction means.

[0009] Specifically, the present inventors have taken the following measures to address a film cleaning device that is configured to use a cleaning liquid to clean and remove ink adhering to a continuously transported film from the film.

[0010] That is, in the first invention, an ink stripping unit that applies the cleaning liquid to the film to strip the ink from the film, a cleaning liquid recovery unit that recovers the cleaning liquid applied to the film by the ink stripping unit, and a water washing unit that washes the film with water are provided in this order in a film transport direction, and the cleaning liquid recovery unit has an outer peripheral layer made of nonwoven fabric that comes into contact with the film while rotating, and a cleaning liquid suction roll that sucks the cleaning liquid applied to the film into the inside of the rotating shaft through gaps in the nonwoven fabric by a first suction means. The film is continuously conveyed while being guided by a plurality of guide rollers, and the surfaces of the guide rollers are mirror-finished. It is characterized by the fact that

[0011] No. 2 In the present invention, 1 of In the present invention, the ink stripping unit is configured to spray the cleaning liquid toward the film using a plurality of cleaning liquid shower nozzles to cause the cleaning liquid to adhere to the film.

[0012] No. 3 In the present invention, 2 In the invention, the ink stripping unit is characterized by having a plurality of stripping rolls which rotate in a reverse direction to the film transport direction while coming into contact with the film to strip the ink.

[0013] No. 4 In the present invention, 3 In the invention, the multiple peeling rolls include at least one first peeling roll whose outer layer is a brush made of flexible resin material, and at least one second peeling roll whose outer layer is a sponge obtained by foaming resin material, and the first peeling roll is located upstream of the second peeling roll in the film transport direction.

[0014] In a fifth aspect of the present invention, there is provided a film cleaning device configured to clean and remove ink adhering to a continuously transported film with a cleaning liquid from the film, the device including an ink stripping unit that applies the cleaning liquid to the film to strip the ink from the film, a cleaning liquid recovery unit that recovers the cleaning liquid adhered to the film by the ink stripping unit, and a water washing unit that washes the film with water, which are provided in this order in a film transport direction, and the cleaning liquid recovery unit includes a cleaning liquid suction unit that contacts the film with an outer peripheral layer made of nonwoven fabric while rotating, and a first suction means that sucks the cleaning liquid adhering to the film into the interior of a rotating shaft through gaps in the nonwoven fabric. The ink peeling unit is configured to spray the cleaning liquid toward the film using a plurality of cleaning liquid shower nozzles to cause the cleaning liquid to adhere to the film, and the ink peeling unit is configured to have a plurality of peeling rolls that rotate in the opposite direction to the film transport direction while contacting the film to peel off the ink, and the plurality of peeling rolls include at least one first peeling roll having an outer peripheral layer made of a brush formed of a flexible resin material and at least one second peeling roll having an outer peripheral layer made of a sponge obtained by foaming the resin material, and the first peeling roll is located upstream of the second peeling roll in the film transport direction.

[0015] The sixth invention is characterized in that in any one of the first to fifth inventions, the water-washing unit is configured to spray water toward the film using a plurality of water shower nozzles to cause the water to adhere to the film.

[0016] In the seventh invention, a film cleaning device configured to clean and remove ink adhering to a continuously transported film with cleaning liquid, the device comprising: an ink stripping unit that applies the cleaning liquid to the film to remove the ink from the film; a cleaning liquid recovery unit that recovers the cleaning liquid applied to the film by the ink stripping unit; and a water washing unit that washes the film with water, which are provided in this order in a film transport direction; the cleaning liquid recovery unit has an outer peripheral layer made of nonwoven fabric that comes into contact with the film while rotating, and includes a cleaning liquid suction roll that uses a first suction means to suck the cleaning liquid adhering to the film through gaps in the nonwoven fabric into the interior of the rotating shaft; and the water washing unit is configured to spray water toward the film using a plurality of water shower nozzles to cause the water to adhere to the film; The water washing unit is characterized by having a plurality of brush-off rolls that rotate in a reverse direction relative to the film transport direction and come into contact with the film to brush off adhering water.

[0017] The eighth invention is characterized in that, in the seventh invention, the multiple brush-off rolls include at least one first brush-off roll whose outer layer is made of a brush formed of flexible resin material, and at least one second brush-off roll whose outer layer is made of a sponge obtained by foaming resin material, and the first brush-off roll is located upstream of the second brush-off roll in the film transport direction.

[0018] The ninth invention is characterized in that, in any one of the first to eighth inventions, a water recovery unit for recovering water adhering to the film is provided downstream of the water washing unit in the film transport direction, and the water recovery unit has an outer layer made of nonwoven fabric that rotates in contact with the film and has an adhering water suction roll that sucks the water adhering to the film through the gaps in the nonwoven fabric into the inside of the rotating shaft by a second suction means.

[0019] A tenth invention is any one of the first to ninth inventions, characterized in that a drive roll is provided on the downstream side of the water washing unit in the film transport direction, the drive roll sending out the film in the film transport direction by a rotational action, and the drive roll includes a cylindrical roll body whose outer circumferential surface is in contact with the film, a drive shaft provided inside the roll body for driving and rotating the roll body, and a sliding bushing provided between the roll body and the drive shaft for rotating the roll body relative to the drive shaft when a predetermined load is applied to the roll body. Effect of the Invention

[0020] In the first invention, the cleaning liquid adhering to the film is gradually sucked into the nonwoven fabric of the outer peripheral layer as the cleaning liquid suction roll rotates, and the cleaning liquid absorbed into the nonwoven fabric is gradually collected by being sucked by the first suction means. Therefore, the cleaning liquid adhering to the film can be efficiently collected, and the cleaning liquid collection rate of the device can be increased. In addition, the area of ​​the cleaning liquid suction roll that comes into contact with the film is made of soft nonwoven fabric, and the cleaning liquid adhering to the film is not scraped off by a wiper blade as in Patent Document 1, so that the film can be prevented from being scratched by the cleaning liquid suction roll. In addition, in the first invention, the contact area of ​​each guide roller with the film is free of uneven surfaces, and the surface of each guide roller does not get caught on the film during film transport, thereby preventing the film from being scratched by each guide roller.

[0021] No. 2 In the invention, ink adhering to the film is washed away with new cleaning liquid successively supplied from the cleaning liquid shower nozzle. This makes it possible to prevent small clumps of ink, etc., that gradually accumulate in the cleaning liquid stored in the first storage tank after cleaning as in Patent Document 1 from adhering to the film that passes through while being immersed in the cleaning liquid stored in the first storage tank, and causing scratches on the film.

[0022] No. 3 In the invention, since ink that is firmly attached to the film can be efficiently peeled off, the ink attached to the film can be removed more efficiently.

[0023] Fourth and In the fifth invention, a coarse-toothed brush is used to roughly remove the ink from the film, and then a sponge with finer mesh than the brush is used to thoroughly remove the ink from the film, thereby enabling the ink to be efficiently removed in a short film transport section.

[0024] In the sixth invention, the ink adhering to the film is washed away with new water successively supplied from the water shower nozzle, which makes it possible to prevent small clumps of ink that gradually accumulate in the water stored in the second tank after washing as in Patent Document 1 from adhering to the film as it passes through the water stored in the second tank and causing scratches on the film.

[0025] In the seventh aspect of the invention, water adhering to the film can be efficiently brushed off downward in a short film transport section, making it possible to make the device compact in overall length.

[0026] In the eighth invention, a coarse-meshed brush is used to roughly brush off the water and ink adhering to the film, and then a sponge with finer mesh than the brush is used to thoroughly brush off the water and ink adhering to the film, thereby enabling the film to be efficiently washed with water in a short film transport section.

[0027] In the ninth aspect of the invention, as the water suction roll rotates, the water adhering to the film is gradually absorbed into the nonwoven fabric of the outer peripheral layer, and the water absorbed into the nonwoven fabric is gradually collected by being sucked by the second suction means. Therefore, the water adhering to the film can be efficiently collected, and the wastewater recovery rate of the device can be increased. In addition, the area of ​​the water suction roll that comes into contact with the film is made of soft nonwoven fabric, so that the film can be prevented from being damaged by the water suction roll.

[0028] In the tenth aspect of the invention, when the transport speed of the film suddenly changes, the relative position between the roll body and the film does not shift in the circumferential direction of the roll body, but the sliding bush shifts the relative angle between the drive shaft and the roll body, thereby preventing the film from being scratched due to the outer circumferential surface of the roll body shifting relative to the film. [Brief description of the drawings]

[0029] [Figure 1] 1 is a schematic configuration diagram of a film cleaning device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of the ink peeling process in FIG. [Diagram 3] FIG. 2 is an enlarged view of the water washing step of FIG. [Figure 4] FIG. 2 is an enlarged view of the outfeed process in FIG. 1. [Diagram 5] FIG. 3 is an enlarged view of part V in FIG. 2. [Figure 6] FIG. 4 is an enlarged view of a portion VI in FIG. [Figure 7] FIG. 7 is an enlarged view of part VII in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which: It should be noted that the following description of the preferred embodiments is merely exemplary in nature.

[0031] 1 shows a film cleaning device 1 according to an embodiment of the present invention. The film cleaning device 1 includes, in order from the upstream side, a film unwinding process 2, an ink stripping process 3, a water rinsing process 4, a drying process 5, an outfeed process 6, and a film winding process 7, and is designed to remove ink adhering to the front and back surfaces of a resin film W1 that is continuously transported while being guided by a number of guide rollers 8 whose surfaces have been subjected to a mirror finish.

[0032] In the film unwinding process 2, an unwinding roll 2a on which the film W1 is wound in a roll shape and a first roll support stand 2b that supports the unwinding roll 2a so that it can rotate freely are arranged, and the film W1 is unwound from the unwinding roll 2a to the ink peeling process 3.

[0033] As shown in FIG. 2, the ink stripping process 3 is composed of an ink stripping unit 3A that uses a cleaning liquid L1 capable of dissolving the ink to strip the ink from the film W1, and a cleaning liquid recovery unit 3B that recovers the cleaning liquid L1.

[0034] The cleaning liquid L1 is a dissolving liquid derived from plants, and for example, PAINTSOLV-W (registered trademark) manufactured by Infinity Co., Ltd. can be used.

[0035] In the upstream half of the ink stripping unit 3A, six guide rollers 8 transport the film W1 in a serpentine manner up and down in a pleated shape, while in the downstream half, three guide rollers 8 transport the film W1 in a serpentine manner up and down so that it forms an approximately W shape when viewed from the front.

[0036] The ink stripping unit 3A includes a first storage tank 3a for storing cleaning liquid L1, a first pump 3b for pumping up the cleaning liquid L1 from the first storage tank 3a, a first filter 3c for passing the cleaning liquid L1 pumped up by the first pump 3b through it to collect foreign matter with a particle size of 5 to 10 μm, a plurality of cleaning liquid shower nozzles 3d for depositing the cleaning liquid L1 that has passed through the first filter 3c onto the film W1, and a plurality of peeling rolls 3e for peeling the ink from the film W1.

[0037] The cleaning liquid shower nozzles 3d are disposed near the respective guide rollers 8, and are adapted to spray cleaning liquid L1 onto the front and back surfaces of the film W1 to cause the cleaning liquid L1 to adhere thereto.

[0038] Incidentally, the cleaning liquid L1 that falls without adhering to the film W1 after being sprayed from the cleaning liquid shower nozzle 3d is collected in the first storage tank 3a.

[0039] Each peeling roll 3e is positioned so as to sandwich the film W1 between itself and three guide rollers 8 (hereinafter, for convenience, they will be referred to as guide rollers 8a to 8c, in order from the upstream side in the film transport direction) located in the downstream half of the ink peeling unit 3A, and is adapted to rotate in the opposite direction to the film transport direction while coming into contact with the film W1 to peel off the ink.

[0040] Each peeling roll 3e includes three first peeling rolls 3f whose outer layer is made of a brush formed of flexible resin material, and two second peeling rolls 3g whose outer layer is made of a sponge obtained by foaming resin material, and the three first peeling rolls 3f are located upstream of the two second peeling rolls 3g in the film transport direction.

[0041] Two of the three first peeling rolls 3f sandwich the film W1 between themselves and the guide roller 8a and are in contact with the front side of the film W1, and one of the three first peeling rolls 3f sandwiches the film W1 between itself and the guide roller 8b and is in contact with the back side of the film W1.

[0042] On the other hand, one of the two second peeling rolls 3g sandwiches the film W1 between itself and the guide roller 8b and is in contact with the back side of the film W1, and the other of the two second peeling rolls 3g sandwiches the film W1 between itself and the guide roller 8c and is in contact with the front side of the film W1.

[0043] The cleaning liquid recovery unit 3B is disposed downstream of the guide roller 8c in the film transport direction, and, as shown in FIG. 5, is equipped with a pair of cleaning liquid suction rolls 30 positioned vertically at a predetermined distance from each other, and a first vacuum unit 31 (first suction means) connected to both cleaning liquid suction rolls 30.

[0044] The cleaning liquid suction roll 30 comprises a cylindrical rotating shaft 32 with a number of suction holes 32a formed in its outer wall, and a nonwoven fabric 33 located on the outside of the rotating shaft 32 and constituting the outer layer of the cleaning liquid suction roll 30.

[0045] The cleaning liquid suction roll 30 located on the lower side rotates so that the nonwoven fabric 33 comes into contact with the front side of the film W1, while the cleaning liquid suction roll 30 located on the upper side rotates so that the nonwoven fabric 33 comes into contact with the back side of the film W1, and the first vacuum unit 31 sucks the cleaning liquid L1 adhering to the film W1 through the gaps between the nonwoven fabrics 33 and each suction hole 32a into the inside of the rotating shaft 32.

[0046] The cleaning liquid L1 collected inside the rotating shaft 32 of each cleaning liquid suction roll 30 is returned to the first storage tank 3a and is reused.

[0047] As shown in FIG. 3, the water-washing step 4 is composed of a water-washing unit 4A for washing the film W1 with water and an adhering water recovery unit 4B for recovering the adhering water adhering to the film W1.

[0048] In the water-washing unit 4A, the film W1 is transported in a vertically serpentine manner so that it forms a roughly W-shape when viewed from the front, by means of four guide rollers 8. For convenience, the four guide rollers 8 in the water-washing unit 4A will be referred to as guide rollers 8d to 8g, in order from the upstream side in the film transport direction.

[0049] The water washing unit 4A includes a second storage tank 4a for storing wastewater, a second pump 4b for pumping up water (city water), a second filter 4c through which the water pumped up by the second pump 4b passes to collect foreign matter having a particle size of 1 to 10 μm, a plurality of water shower nozzles 4d for depositing the water that has passed through the second filter 4c onto the film W1, and a plurality of brush-off rolls 4e for brushing off water adhering to the film W1.

[0050] The water shower nozzles 4d are disposed near the respective guide rollers 8, and are adapted to spray water onto the front and back surfaces of the film W1 to cause the water to adhere thereto.

[0051] Incidentally, the water that falls after being sprayed from the water shower nozzle 4d without adhering to the film W1 is collected in the second storage tank 4a.

[0052] Each of the brush-off rolls 4e is disposed so as to sandwich the film W1 between itself and the guide rollers 8e to 8g, and rotates in the opposite direction to the film transport direction while coming into contact with the film W1 to brush off any adhering water.

[0053] Each brush-off roll 4e includes three first brush-off rolls 4f whose outer layer is made of a brush formed of flexible resin material, and two second brush-off rolls 4g whose outer layer is made of a sponge obtained by foaming resin material. The three first brush-off rolls 4f are located upstream of the two second brush-off rolls 4g in the film transport direction.

[0054] Two of the three first brush-off rolls 4f sandwich the film W1 between themselves and the guide roller 8e and are in contact with the front side of the film W1, and one of the three first brush-off rolls 4f sandwiches the film W1 between itself and the guide roller 8f and is in contact with the back side of the film W1.

[0055] On the other hand, one of the two second brush-off rolls 4g sandwiches the film W1 between itself and the guide roller 8f and is in contact with the back side of the film W1, and the other of the two second brush-off rolls 4g sandwiches the film W1 between itself and the guide roller 8g and is in contact with the front side of the film W1.

[0056] The adhering water recovery unit 4B is disposed downstream of the guide roller 8g in the film transport direction, and, as shown in FIG. 6, is equipped with a pair of adhering water suction rolls 40 positioned vertically at a predetermined distance from each other, and a second vacuum unit 41 (second suction means) connected to both of the adhering water suction rolls 40.

[0057] The adhering water suction roll 40 comprises a cylindrical rotating shaft 42 having a number of suction holes 42a formed in its outer wall, and a nonwoven fabric 43 located on the outside of the rotating shaft 42 and constituting the outer layer of the adhering water suction roll 40.

[0058] The lower water suction roll 40 rotates so that the nonwoven fabric 43 comes into contact with the front side of the film W1, while the upper water suction roll 40 rotates so that the nonwoven fabric 43 comes into contact with the back side of the film W1, and the second vacuum unit 41 sucks the water adhering to the film W1 through the gaps between the nonwoven fabrics 43 and the suction holes 42a into the inside of the rotating shaft 42.

[0059] The water collected inside the rotating shaft 42 of each adhering water suction roll 40 is returned to the second storage tank 4a as drainage water.

[0060] A floating dryer 5a is installed in the drying step 5. As shown in Fig. 1, the floating dryer 5a is equipped with a plurality of air nozzles 5b that blow air toward the film W1, and air pipes 5c that introduce air to each of the air nozzles 5b.

[0061] The air nozzles 5b are arranged alternately on the upper and lower sides of the film W1, which is transported horizontally, in a staggered pattern at predetermined intervals in the film transport direction, so that the film W1 is transported in a meandering manner when viewed from the front, due to the air blown out from each air nozzle 5b.

[0062] The air pipes 5c are disposed on the upper and lower sides of the film W1, respectively, are linearly extended in the film transport direction, and are connected to the air nozzles 5b.

[0063] Air introduced from a blower (not shown) is blown from each air nozzle 5b through each air pipe 5c toward the film W1 that is being continuously transported, thereby drying the film W1.

[0064] As shown in FIG. 4, a driving roll 6a and a driven roll 6b are provided midway through the outfeed process 6, which sandwich the film W1 that has passed through the drying process 5 and send it out to the film winding process 7 by rotating them.

[0065] As shown in FIG. 7, the drive roll 6a includes a cylindrical roll body 6c whose outer circumferential surface is in contact with the film W1, a drive shaft 6d that is provided inside the roll body 6c and drives the roll body 6c to rotate, and a sliding bush 6e that is provided between the roll body 6c and the drive shaft 6d and rotates the roll body 6c relative to the drive shaft 6d when a predetermined load is applied to the roll body 6c.

[0066] As shown in FIG. 1, the film winding process 7 includes a winding roll 7a that winds up the film W1 that has passed through the outfeed process 6 into a roll, and a second roll support stand 7b that rotatably supports the winding roll 7a. The film W1 from which any adhering ink has been removed by cleaning liquid L1 is wound onto the winding roll 7a.

[0067] As described above, according to the embodiment of the present invention, the cleaning liquid L1 adhering to the film W1 is sequentially sucked into the nonwoven fabric 33 of the outer peripheral layer as each cleaning liquid suction roll 30 rotates, and the cleaning liquid L1 sucked into the nonwoven fabric 33 is sequentially collected by being sucked by the first vacuum unit 31. Therefore, the cleaning liquid L1 adhering to the film W1 can be efficiently collected, and the recovery rate of the cleaning liquid L1 of the film cleaning device 1 can be increased. In addition, the area of ​​each cleaning liquid suction roll 30 that contacts the film W1 is made of soft nonwoven fabric 33, and the cleaning liquid adhering to the film is not scraped off by a wiper blade as in Patent Document 1, so that the film W1 can be prevented from being scratched by the cleaning liquid suction roll 30.

[0068] In addition, since the outer peripheral surface of each guide roller 8 is mirror-finished, there are no uneven surfaces in the contact area between each guide roller 8 and the film W1. This means that the surface of each guide roller 8 will not get caught on the film W1 when the film W1 is transported, thereby preventing scratches on the film W1 caused by each guide roller 8.

[0069] In addition, the ink adhering to the film W1 is washed away by new cleaning liquid L1 sequentially supplied from each cleaning liquid shower nozzle 3d. This prevents small clumps of ink that gradually accumulate in the cleaning liquid stored in the first storage tank after cleaning as in Patent Document 1 from adhering to the film that passes through the cleaning liquid stored in the first storage tank and causing scratches on the film.

[0070] In addition, since each peeling roll 3e rotates in the opposite direction to the film transport direction while contacting the film W1 and peeling off the ink, ink that is firmly attached to the film W1 can be efficiently peeled off, and the ink adhering to the film W1 can be removed even more efficiently.

[0071] In addition, in the ink stripping unit 3A, after the ink is roughly stripped off from the film W1 with a coarse brush, the ink is thoroughly stripped off from the film W1 with a sponge that is finer than the brush, so that the ink can be efficiently stripped off in a short film transport section.

[0072] In addition, the ink adhering to the film W1 is washed away with new water successively supplied from the water shower nozzle 4d. This prevents small clumps of ink that gradually accumulate in the water stored in the second tank after washing with water as in Patent Document 1 from adhering to the film that passes through the water stored in the second tank and causing scratches on the film.

[0073] In addition, since each brush-off roll 4e rotates in the opposite direction to the film transport direction while contacting the film W1 and brushing off the adhering water, the water adhering to the film W1 can be efficiently brushed downward in a short film transport section, and the overall length of the film cleaning device 1 can be made compact.

[0074] In addition, in the water washing unit 4A, a coarse brush is used to roughly brush off the adhering water and ink from the film W1, and then a sponge with finer mesh than the brush is used to thoroughly brush off the adhering water and ink from the film W1, so that the film W1 can be efficiently washed with water in a short film transport section.

[0075] As the water suction roll 40 rotates, the water adhering to the film W1 is gradually sucked into the nonwoven fabric 43 of the outer peripheral layer, and the water absorbed into the nonwoven fabric 43 is gradually collected by being sucked up by the second vacuum unit 41. This makes it possible to efficiently collect the water adhering to the film W1, thereby increasing the wastewater recovery rate of the film washing device 1. Furthermore, because the area of ​​the water suction roll 40 that comes into contact with the film W1 is made of soft nonwoven fabric 43, it is possible to prevent the film W1 from being scratched by the water suction roll 40.

[0076] Furthermore, when the transport speed of the film W1 suddenly changes, the relative position between the roll body 6c and the film W1 does not shift in the circumferential direction of the roll body 6c, but the sliding bush 6e shifts the relative angle between the drive shaft 6d and the roll body 6c. This makes it possible to prevent the film W1 from being scratched due to the outer circumferential surface of the roll body 6c shifting relative to the film W1. [Industrial Applicability]

[0077] The present invention is suitable for a film cleaning device that uses a cleaning liquid to clean and remove ink adhering to a continuously transported film. [Explanation of symbols]

[0078] 1 Film cleaning device 3A Ink stripping unit 3B Cleaning solution recovery unit 3d Cleaning solution shower nozzle 3e Peel roll 3f First peeling roll 3g 2nd peel roll 4A Water washing unit 4B Adherent water recovery unit 4d Water Shower Nozzle 4e Dust removal roll 4F No. 1 brushing roll 4g Second dusting roll 6a Driving Roll 6c Roll body 6d Drive shaft 6e Sliding bush 8 Guide roller 30 Cleaning fluid suction roll 31 First vacuum unit (first suction means) 32 Rotation axis 33 Nonwoven fabrics 40 Adherent water suction roll 41 Second vacuum unit (second suction means) 42 Rotation axis 43 Nonwoven fabrics W1 Film L1 cleaning solution

Claims

1. A film cleaning device configured to remove ink adhering to a continuously transported film by cleaning the film with a cleaning liquid, an ink stripping unit that applies the cleaning liquid to the film to strip the ink from the film, a cleaning liquid recovery unit that recovers the cleaning liquid applied to the film by the ink stripping unit, and a water washing unit that washes the film with water, which are provided in this order in a film transport direction; the cleaning liquid recovery unit includes a cleaning liquid suction roll having an outer peripheral layer made of nonwoven fabric that rotates and comes into contact with the film, and a first suction means that sucks the cleaning liquid adhering to the film through gaps in the nonwoven fabric into the inside of a rotating shaft; The film is continuously transported while being guided by a plurality of guide rollers, A film cleaning device characterized in that the surfaces of the guide rollers are mirror-finished.

2. The film cleaning device according to claim 1, The ink stripping unit is configured to spray the cleaning liquid toward the film using a plurality of cleaning liquid shower nozzles to cause the cleaning liquid to adhere to the film.

3. The film cleaning device according to claim 2, The ink stripping unit is provided with a plurality of stripping rolls which rotate in a reverse direction relative to a film transport direction while contacting the film to strip the ink therefrom.

4. The film cleaning device according to claim 3, The plurality of peeling rolls include at least one first peeling roll, the outer circumferential layer of which is a brush made of a flexible resin material, and at least one second peeling roll, the outer circumferential layer of which is a sponge obtained by foaming the resin material, The film cleaning device, wherein the first peeling roll is located upstream of the second peeling roll in a film transport direction.

5. A film cleaning device configured to remove ink adhering to a continuously transported film by cleaning the film with a cleaning liquid, comprising: an ink stripping unit that applies the cleaning liquid to the film to strip the ink from the film, a cleaning liquid recovery unit that recovers the cleaning liquid applied to the film by the ink stripping unit, and a water washing unit that washes the film with water, which are provided in this order in a film transport direction; the cleaning liquid recovery unit includes a cleaning liquid suction roll having an outer peripheral layer made of nonwoven fabric that rotates and comes into contact with the film, and a first suction means that sucks the cleaning liquid adhering to the film through gaps in the nonwoven fabric into the inside of a rotating shaft; the ink stripping unit is configured to spray the cleaning liquid toward the film using a plurality of cleaning liquid shower nozzles to cause the cleaning liquid to adhere to the film; the ink stripping unit includes a plurality of stripping rolls that rotate in a reverse direction relative to a film transport direction while contacting the film to strip the ink therefrom; The plurality of peeling rolls include at least one first peeling roll, the outer circumferential layer of which is a brush made of a flexible resin material, and at least one second peeling roll, the outer circumferential layer of which is a sponge obtained by foaming the resin material, The film cleaning device, wherein the first peeling roll is located upstream of the second peeling roll in a film transport direction.

6. The film cleaning device according to any one of claims 1 to 5, The water washing unit is configured to spray water toward the film using a plurality of water shower nozzles to cause the water to adhere to the film.

7. A film cleaning device configured to remove ink adhering to a continuously transported film by cleaning the film with a cleaning liquid, comprising: an ink stripping unit that applies the cleaning liquid to the film to strip the ink from the film, a cleaning liquid recovery unit that recovers the cleaning liquid applied to the film by the ink stripping unit, and a water washing unit that washes the film with water, which are provided in this order in a film transport direction; the cleaning liquid recovery unit includes a cleaning liquid suction roll having an outer peripheral layer made of nonwoven fabric that rotates and comes into contact with the film, and a first suction means that sucks the cleaning liquid adhering to the film through gaps in the nonwoven fabric into the inside of a rotating shaft; the water washing unit is configured to spray water toward the film using a plurality of water shower nozzles to cause the water to adhere to the film; The water washing unit is provided with a plurality of brush-off rolls that rotate in a reverse direction relative to a film transport direction to come into contact with the film and brush off adhering water.

8. The film cleaning device according to claim 7, The plurality of brush-off rolls include at least one first brush-off roll having an outer peripheral layer formed of a brush whose bristles are made of a flexible resin material, and at least one second brush-off roll having an outer peripheral layer formed of a sponge obtained by foaming the resin material, The film cleaning device according to claim 1, wherein the first brushing roll is located upstream of the second brushing roll in a film transport direction.

9. 9. The film cleaning device according to claim 1, a water recovery unit for recovering water adhering to the film is provided downstream of the water washing unit in the film transport direction, The film cleaning device is characterized in that the adhering water recovery unit is equipped with an adhering water suction roll in which an outer layer made of nonwoven fabric rotates in contact with the film and a second suction means sucks the adhering water on the film through the gaps in the nonwoven fabric into the inside of the rotating shaft.

10. 10. The film cleaning device according to claim 1, a drive roll disposed downstream of the washing unit in the film transport direction and configured to feed the film in the film transport direction by a rotational motion; The drive roll is characterized in that it comprises a cylindrical roll body whose outer peripheral surface is in contact with the film, a drive shaft provided inside the roll body for driving and rotating the roll body, and a sliding bush provided between the roll body and the drive shaft for rotating the roll body relative to the drive shaft when a predetermined load is applied to the roll body.

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