Liquid treatment method for film and liquid treatment device for film

Abstract

Provided is a liquid treatment method for a film, said liquid treatment method comprising: a step for preparing a film roll of a film wound into a roll shape; a step for feeding out the film from the film roll; a liquid treatment step for treating the fed-out film using a treatment liquid; a first liquid removal step for removing the liquid from the film (for example, base material film (91)) by passing the film after the liquid treatment step through a first liquid removal roller (81), which has an outer diameter that is larger at the center part than at the both end parts in the axial direction, while a first surface (9a) of the film is in contact with the first liquid removal roller (81), and blowing gas onto a second surface which is on the opposite side from the first surface (9a) of the film; and a film collection step for collecting, by winding the film into a roll shape, the film from which the liquid has been removed in the first liquid removal step.

Description

Liquid treatment method for film and liquid treatment apparatus for film

[0001] The present invention relates to a liquid treatment method for a film and a liquid treatment apparatus for a film.

[0002] When performing treatment such as cleaning with a liquid in a roll-to-roll manner, it is necessary to remove the liquid remaining on the film. In the method of removing the liquid by drying, energy consumption is high and the environmental load is large. For this reason, a method of draining the liquid adhering to the film without causing as much energy consumption as possible has been studied. For example, in Patent Document 1, in a fabric conveying device that conveys a fabric by an endless conveying belt to which a double-sided adhesive film is attached to the surface, means for cleaning the conveying belt and the double-sided adhesive film, a draining means for removing the cleaning water, a first wiping means having the same width as the draining means, and a second wiping means having a narrower width are disclosed. Patent Document 2 discloses a web processing apparatus having at least a conveying system that arranges a plurality of conveying rollers in the conveying direction of a web to convey the web, and a wet processing unit that performs wet processing on the web, wherein a portion of the conveying roller in the wet processing unit that contacts the web is made of a material having a receding contact angle with water of 90 degrees or more and 115 degrees or less. Patent Document 3 discloses a liquid draining roll characterized in that a material having a low hardness and high water absorption and a material having a low water absorption and high hardness are alternately arranged around the roll shaft without unevenness in the rotational direction.

[0003] Japanese Patent Application Laid-Open No. 2001-122486, Japanese Patent Application Laid-Open No. 2016-088705, Japanese Patent Application Laid-Open No. 2017-020609

[0004] As means for draining the film, a pair of mangle rollers are described in Patent Document 1, a conveying roller made of a water-repellent material is described in Patent Document 2, and a liquid draining roll made of a low-hardness and high-water-absorption material and a high-hardness and low-water-absorption material is described in Patent Document 3. However, even when these liquid draining means are used, the liquid adhering to the film may not be sufficiently removed.

[0005] The object of the present invention is to provide a film liquid treatment method and a film liquid treatment apparatus that can efficiently remove liquid adhering to the film in a roll-to-roll manner.

[0006] [1] A method for liquid processing a film, comprising: a step of preparing a film roll in which a film is wound in a roll shape; a step of unwinding the film from the film roll; a liquid processing step of processing the unwinded film with a processing liquid; a first liquid cutting step of passing the film after the liquid processing step through a first liquid cutting roller, the first surface of the film being brought into contact with the first liquid cutting roller, the first surface of the film being brought into contact with the first liquid cutting roller, and blowing gas onto the second surface of the film opposite to the first surface to cut the liquid off the film; and a film recovery step of winding the film that has been cut in the first liquid cutting step into a roll shape for recovery. [2] The method for liquid processing a film according to [1], wherein the first liquid cutting step is performed by blowing the gas from a direction perpendicular to the axial direction of the first liquid cutting roller toward the position of the maximum diameter of the first liquid cutting roller. [3] The liquid treatment method for a film according to [1] or [2], wherein the film is a laminated film having a base film and a coating layer, the liquid treatment step is a step of spraying pressurized water onto the coating layer of the laminated film as the laminated film passes through a backup roller to remove the coating layer, and the film that is de-liquidated in the first de-liquid step after the liquid treatment step is the base film. [4] The liquid treatment method for a film according to [3], further comprising a step of filtering the water containing the coating layer removed in the liquid treatment step and circulating it to a pump. [5] The liquid treatment method for a film according to [3] or [4], wherein the coating layer includes a release agent layer. [6] The liquid treatment method for a film according to [5], wherein the coating layer includes a ceramic green sheet. [7] The liquid treatment method for a film according to any one of [1] to [6], further comprising a second de-liquid step different from the first de-liquid step, the second de-liquid step de-liquidating the first surface of the film.[8] The second liquid removal step is a step of passing the film through a second liquid removal roller, which is different from the first liquid removal roller, while bringing the second surface of the film into contact with it, and blowing gas onto the first surface of the film, wherein the outer diameter of the central part in the axial direction of the second liquid removal roller is larger than the outer diameter of both ends in the axial direction, the liquid treatment method for a film according to [7]. [9] A liquid processing apparatus for a film, comprising: a dispensing shaft for dispensing the film from a film roll in which the film is wound in a roll shape; a liquid processing unit disposed downstream of the dispensing shaft for processing the film with a processing liquid; a first de-liquid unit disposed downstream of the liquid processing unit for de-liquidating the film processed in the liquid processing unit; and a winding shaft disposed downstream of the first de-liquid unit for winding the film de-liquidated in the first de-liquid unit into a roll shape, wherein the first de-liquid unit comprises a first de-liquid roller having an outer diameter at its axial center greater than the outer diameters at both ends in the axial direction, and a first gas blowing unit, and the first gas blowing unit includes one or more first gas nozzles disposed opposite to the first de-liquid roller, and blows gas onto a second surface of the film opposite to the first surface as the film passes the first de-liquid roller while in contact with the first surface of the film.

[10] The liquid processing apparatus for a film according to [9], wherein the film is a laminated film having a base film and a coating layer on the second side, and the liquid processing unit comprises a backup roller disposed downstream of the feed shaft for transporting the laminated film downstream, an injection unit which includes one or more liquid nozzles disposed opposite to the backup roller and injects pressurized water from the one or more liquid nozzles onto the coating layer of the laminated film as the laminated film passes the backup roller, and a pressurized water supply unit which pressurizes water and supplies pressurized water to the injection unit, the pressurized water supply unit which includes a pump, and the injection unit which is connected to the pump.

[11] The liquid processing apparatus for a film according to [9] or

[10] , wherein at least one of the one or more first gas nozzles is disposed to face directly opposite at the position of the maximum diameter of the first liquid cutting roller.

[12] The liquid processing apparatus for a film according to any one of [9] to

[11] , further comprising a second liquid cutting section disposed downstream of the first liquid cutting section for cutting the first surface of the film that has been cut by the first liquid cutting section.

[13] The liquid processing apparatus for a film according to

[12] , wherein the second liquid cutting section comprises a second liquid cutting roller and a second gas spraying section, the second gas spraying section includes one or more second gas nozzles disposed opposite to the second liquid cutting roller, and sprays gas onto the first surface of the film as the film passes the second liquid cutting roller while in contact with the side of the second surface of the film.

[14] The liquid processing apparatus for a film according to

[13] , wherein the outer diameter of the central part in the axial direction of the second liquid cutting roller is larger than the outer diameters of both ends in the axial direction.

[0007] According to one aspect of the present invention, a film liquid treatment method and a film liquid treatment apparatus can be provided that can efficiently remove liquid adhering to the film in a roll-to-roll manner.

[0008] A cross-sectional view of a first example of a film used in the liquid processing method of the first embodiment. A cross-sectional view of a second example of a film used in the liquid processing method of the first embodiment. A perspective view of a third example of a film used in the liquid processing method of the first embodiment. A diagram illustrating the first liquid cutting process of the first embodiment. A schematic diagram of an example of a liquid processing apparatus of the second embodiment. A schematic diagram of an example of a liquid processing apparatus of the third embodiment.

[0009] In this specification, "film" includes single-layer films and laminated films. In this specification, ordinal numbers such as "first" and "second" are used to distinguish between components and do not indicate order. In this specification, expressions without ordinal numbers, such as "drip roller," are a general term for drip rollers and are used when describing drip rollers that have ordinal numbers such as "first" and "second." For example, when a description is made that applies to multiple components that are indicated with ordinal numbers, such as "first drip roller" and "second drip roller," the "first drip roller" and "second drip roller" are expressed collectively by omitting the ordinal number and simply using "drip roller."

[0010] [First Embodiment] [Liquid Treatment Method for Coating Layer] The liquid treatment method for film according to this embodiment includes the steps of: preparing a film roll in which the film is wound in a roll shape; unwinding the film from the film roll; a liquid treatment step of treating the unwinded film with a treatment liquid; a first liquid cutting step of passing the film after the liquid treatment step through a first liquid cutting roller, the first surface of the film being brought into contact with the first liquid cutting roller, the first surface of the film being brought into contact with the first surface of the film, and blowing gas onto the second surface of the film opposite to the first surface to cut off the liquid; and a film recovery step of winding the film that has been cut off in the first liquid cutting step into a roll shape and recovering it.

[0011] (Film) First, the first to third examples of films used in the liquid treatment method of this embodiment will be described. The first to third examples are films before the liquid treatment process. The film before the liquid treatment process may be a single-layer film or a laminated film. Figure 1 is a cross-sectional view of the first example of the film. The film 90 of the first example is a single-layer film. The film 90 of the first example may be a laminated film with a different configuration from the laminated films shown in Figures 2 and 3. The film 90 has a first surface 9a and a second surface 9b opposite to the first surface 9a. Figure 2 is a cross-sectional view of the second example of the film. The film of the second example is a laminated film 90A, which has a base film 91 and a coating layer 92. The laminated film 90A has a first surface 9a on the side of the base film 91 and a second surface 9b on the side of the coating layer 92. The base film 91 has a first surface 9a and a second base surface 9c opposite to the first surface 9a. The base film 91 and the coating layer 92 are directly laminated together.

[0012] Figure 3 is a perspective view of a third example of the film. The third example of the film is a laminated film 90B used in the manufacture of a multilayer ceramic capacitor (MLCC), after the necessary portion of the ceramic green sheet has been peeled off. The laminated film 90B has a base film 91 and a coating layer 92A. The coating layer 92A includes a release agent layer 921 and a ceramic green sheet 922 (residue) from the side of the base film 91. The laminated film 90B is wound around a core 1G to form a roll (laminated film roll). An insertion hole 2G is provided in the central part of the core 1G. Preferably, the ceramic green sheet 922 is a green sheet composed of a dielectric as an active ingredient. The coating layer 92A may be a multilayer including a release agent layer 921, a ceramic green sheet 922, and a conductive layer composed of a conductor as an active ingredient, from the side of the base film 91. A green sheet is an unfired sheet-like material, and a green sheet with ceramics as an active ingredient is called a ceramic green sheet. The base film 91 and the release agent layer 921 are directly laminated, and the release agent layer 921 and the ceramic green sheet 922 are directly laminated. The ceramic green sheet 922 is partially provided on the surface of the release agent layer 921. After the ceramic green sheet 922 is peeled off, a recess 930 is formed, and the release agent layer 921 is exposed from the recess 930.

[0013] Next, an example of a liquid treatment method according to this embodiment will be described. In the following description, the case in which (1) to (3) are adopted will be described. The film structure, liquid treatment process and first liquid removal process are not limited to the following. (1) A laminated film 90A shown in Figure 2 is used as the film (film before the liquid treatment process). (2) Pressurized water (an example of a treatment liquid) is sprayed as the liquid treatment process to remove the coating layer 92 from the laminated film 90A. (3) Water droplets originating from pressurized water are removed from the base film 91 as the first liquid removal process.

[0014] First, the laminated film 90A is unwound from the prepared laminated film roll (preparation step, unwound step). As the unwound laminated film 90A passes through the backup roller, pressurized water is sprayed onto the coating layer 92 of the laminated film 90A, removing the coating layer 92 (liquid treatment step). The base film 91 after the liquid treatment step is deliqued (first deliquing step). The deliqued base film 91 is wound into a roll and recovered (film recovery step). The first deliquing step will be explained with reference to Figure 4. Figure 4 shows the state in which the base film 91 after the liquid treatment step is deliqued by the first deliquing unit 801. The surface of the base film 91 that is deliqued is the second surface 9c of the base film on which pressurized water was sprayed. Water droplets are formed on the second surface 9c of the base film by the water that adhered during the liquid treatment step. The first deliquing unit 801 includes a first deliquing roller 81 and a first gas spraying unit 81A. The symbol G represents the central axis of the first liquid-cutting roller 81, and the symbol 811 represents the support portion. In the axial cross-sectional view, the first liquid-cutting roller 81 has a convex shape in the center and a shape that slopes from the center to both ends. Specifically, the outer diameter R1 of the central part of the first liquid-cutting roller 81 in the axial direction is larger than the outer diameter R2 of the first end portion 1 in the axial direction (similarly the outer diameter of the second end portion 2). In the first liquid-cutting process, the base film 91 is passed in the +X direction (from front to back) while the first surface 9a of the base film 91 is in contact with the first liquid-cutting roller 81, and gas is blown from the first gas-blowing portion 81A onto the surface of the base film 91 opposite to the first surface 9a (the second surface 9c of the base film). In the first liquid removal step, water droplets adhering to the second substrate surface 9c (liquid removal surface) of the substrate film 91 are guided by the spraying of gas by the first gas spraying unit 81A and the inclined surface of the first liquid removal roller 81, and are blown away in the direction of the "water droplet flow" in Figure 4, and released to the outside of the first liquid removal roller 81. Therefore, according to the liquid treatment method of this embodiment, liquid adhering to the film (in the above case, the substrate film 91) can be efficiently removed roll-to-roll. Note that the above liquid treatment step is just an example. The first liquid removal step of this embodiment can be used to remove liquid from a film after any liquid treatment step.

[0015] The steps of the liquid processing method according to the first embodiment will be described below.

[0016] <Preparation Process, Unwinding Process> The preparation process involves preparing a film roll in which the film is wound into a roll shape. The unwinding process involves unwinding the film from the film roll. The dimensions of the film are, for example, a width of 100 mm or more and 1000 mm or less, preferably 200 mm or more and 600 mm or less. The length of the film is, for example, 50 m or more and 30000 m or less, preferably 100 m or more and 10000 m or less. The winding diameter of the film roll (the diameter of the roll including the core) is, for example, 100 mm or more and 1500 mm or less, preferably 150 mm or more and 1000 mm or less.

[0017] <Liquid Processing Process> The liquid processing process involves treating the unwound film with a processing liquid. The processing liquid used in the liquid processing process can be water, an alkaline aqueous solution, or a non-aqueous liquid. Alternatively, a known cleaning solution may be used as the processing liquid. First, the case where water is used as the processing liquid will be explained.

[0018] The water used as the treatment liquid means "ordinary water," that is, preferably industrial water, and may be purified water or distilled water. It may also be recycled wastewater used in various industrial productions, or recycled wastewater after it has been used in the implementation of this embodiment. If wastewater is recycled, it may be treated to regenerate the wastewater as appropriate. From the viewpoint of improving work efficiency, the water used as the treatment liquid may contain additives that add functionality as appropriate, but it is preferable not to include them. Examples of additives include surfactants and water-soluble organic solvents. If the water used as the treatment liquid contains additives, the concentration of the active ingredient of the additive in the treatment liquid is preferably 0.2% by mass or less, more preferably 0.1% by mass or less, relative to the total amount of the treatment liquid, and furthermore, it is preferable that the water used as the treatment liquid is not water to which additives have been intentionally added. Furthermore, since wastewater may be treated with a simple recycling process, the water used as the treatment solution may contain basic and acidic substances as additives. In that case, it is preferable that the pH of the treatment solution be between 5.8 and 8.6 in accordance with the uniform wastewater discharge standards (other items) based on the Water Pollution Control Law.

[0019] When water is used as the processing solution, the water temperature is preferably at room temperature, and it may be cold water or warm water.

[0020] An alkaline aqueous solution may be used as the processing solution. When an alkaline aqueous solution is used as the processing solution, for example, the liquid processing step is a step in which the coating layer is removed from the laminated film by immersing at least a part of the laminated film (preferably the entire laminated film) in the alkaline aqueous solution. Alternatively, the liquid processing step may be a step in which the film is washed by immersing the film in the alkaline aqueous solution. Examples of the alkaline aqueous solution include one or more aqueous solutions selected from sodium hypochlorite aqueous solution, sodium hydroxide aqueous solution, and potassium hydroxide aqueous solution. The alkaline aqueous solution is preferably a sodium hydroxide aqueous solution or a potassium hydroxide aqueous solution, and more preferably a potassium hydroxide aqueous solution. The alkaline aqueous solution may further contain auxiliary agents. Examples of auxiliary agents include surfactants, water-soluble inorganic compounds, water-soluble organic compounds, and water-soluble solvents. Specific examples of auxiliary agents include nonionic surfactants, water-soluble inorganic salts, water-soluble organic salts, water-soluble polymers, polysaccharides, alcohols, glycols, and water-soluble organic solvents. Examples of glycols include ethylene glycol, diethylene glycol, and propylene glycol. Examples of water-soluble organic solvents include dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and ethylene glycol ethers (various cellosolves). The auxiliary agents may be used alone or in combination of two or more.

[0021] In the liquid treatment process, the concentration of the alkaline aqueous solution used when immersing the film in the alkaline aqueous solution is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and even more preferably 3.0% by mass or more. The concentration of the alkaline aqueous solution is preferably 60% by mass or less, more preferably 55% by mass or less, even more preferably 50% by mass or less, even more preferably 47% by mass or less, and even more preferably 45% by mass or less. If the alkaline aqueous solution contains an auxiliary agent, the concentration of the alkaline aqueous solution refers to the total concentration of alkaline components in the alkaline aqueous solution. After carrying out the liquid treatment process, the alkaline aqueous solution used as the treatment liquid is neutralized so that it can be disposed of.

[0022] A non-aqueous liquid may be used as the processing solution. An example of a non-aqueous liquid is an organic solvent. Known non-aqueous cleaning solutions can be used as the non-aqueous liquid. Examples of non-aqueous cleaning solutions include hydrocarbon-based cleaning solutions, alcohol-based cleaning solutions, chlorine-based cleaning solutions, and fluorine-based cleaning solutions.

[0023] The liquid processing steps are not particularly limited, but examples include the following steps L1 to L3. In the case of steps L1 and L2, the film that is de-liquidated in the de-liquid step is the base film. (Step L1) A step in which a laminated film having a base film and a coating layer is used, and pressurized water (an example of a processing solution) is sprayed onto the coating layer of the laminated film as the laminated film passes through a backup roller to remove the coating layer. (Step L2) A step in which a laminated film having a base film and a coating layer is used, and the coating layer is removed by immersing the laminated film in water or an alkaline aqueous solution (an example of a processing solution). (Step L3) A step in which a saponified cellulose ester resin is washed with water in the manufacturing process of a cellulose resin film for polarizing plate elements. The processing solution used in the water washing step is preferably water.

[0024] <First Liquid Removal Process> In the first liquid removal process, the film is passed through the first liquid removal roller while the first surface of the film after the liquid treatment process is in contact with it, and gas is blown onto the second surface of the film opposite to the first surface to remove the liquid. The gas used in the first liquid removal process may be air or an inert gas such as nitrogen gas. The first liquid removal roller is a roller in which the outer diameter of the central part in the axial direction is larger than the outer diameter of both ends in the axial direction. The first liquid removal roller is not particularly limited, but a crown roll is an example. Examples of crown rolls include (i) a roll that is processed so that the dimensions decrease in an arc from the central part in the axial direction to both ends in the axial direction (radial roll), and (ii) a roll that is processed by connecting tapers so that the dimensions decrease from the central part in the axial direction to both ends in the axial direction (tapered crown). In the first liquid dewatering step, it is preferable that the film after the liquid treatment step passes through the first liquid dewatering roller while deforming in an arc shape so as to follow the bulge of the first liquid dewatering roller, and that the film is dewatered by blowing gas onto the second surface of the film. The first surface of the film is the surface that is in contact with the first liquid dewatering roller.

[0025] The first liquid removal process is preferably carried out while blowing gas from a direction perpendicular to the axial direction of the first liquid removal roller toward the position of the maximum diameter of the first liquid removal roller.

[0026] The outer diameter of the central part of the first liquid-spraying roller in the axial direction (outer diameter R1 in the case of Figure 4) is, for example, 20 mm or more and 500 mm or less, preferably 50 mm or more and 250 mm or less. The outer diameters of both ends of the first liquid-spraying roller in the axial direction (outer diameter R2 in the case of Figure 4) are, for example, 10 mm or more and 490 mm or less, preferably 40 mm or more and 240 mm or less. The difference between the outer diameter of the central part of the first liquid-spraying roller in the axial direction and the outer diameters of both ends in the axial direction (the difference between outer diameter R1 and outer diameter R2 in the case of Figure 4) is, for example, 5 mm or more and 50 mm or less, preferably 10 mm or more and 30 mm or less. The axial length of the first liquid-spraying roller is, for example, 20 cm or more and 250 cm or less.

[0027] <Second Liquid Dehydration Step> The liquid treatment method according to this embodiment has a second liquid dehydration step that is different from the first liquid dehydration step, and it is preferable that the second liquid dehydration step is a step of dehydrating the first surface of the film. When the liquid treatment method according to this embodiment has a second liquid dehydration step, the second liquid dehydration step may be performed after the first liquid dehydration step, or the second liquid dehydration step may be performed before the first liquid dehydration step. One embodiment of the liquid treatment method according to this embodiment has a preparation step, a dispensing step, a liquid treatment step, a first liquid dehydration step, a second liquid dehydration step, and a film recovery step in this order. In this case, at least the film surface treated with liquid in the liquid treatment step (second surface 9b in Figure 1, and second surface 9c of the base material in Figure 2) is dehydrated first (first liquid dehydration step), and then the surface opposite to the film surface (first surface 9a in Figures 1 and 2) is dehydrated (second liquid dehydration step). Another embodiment of the liquid processing method according to this embodiment includes a preparation step, a dispensing step, a liquid processing step, a second liquid de-draining step, a first liquid de-draining step, and a film recovery step in this order. In this case, first, the first surface of the film (first surface 9a in Figures 1 and 2) is de-dried (second liquid de-draining step), and then the surface opposite to the film surface (second surface 9b in Figure 1, and second surface 9c of the substrate in Figure 2) is de-dried (first liquid de-draining step).

[0028] The liquid removal means in the second liquid removal process is not particularly limited. Examples of liquid removal means include a second liquid removal roller and a residue removal device. An example of a second liquid removal roller is a crown roll. The second liquid removal roller may have the same configuration as the first liquid removal roller or a different configuration. Examples of a residue removal device include a water removal nozzle (also called an air knife) and a dryer. In this embodiment, the second liquid removal process is preferably a process in which the second side of the film is brought into contact with a second liquid removal roller, which is different from the first liquid removal roller, while the film is passed through the roller and gas is blown onto the first side of the film. It is preferable that the outer diameter of the central part in the axial direction of the second liquid removal roller is larger than the outer diameters of both ends in the axial direction. In other words, it is preferable that the second liquid removal roller is a crown roll. It is preferable that the outer diameter of the central part in the axial direction of the second liquid removal roller, the outer diameters of both ends in the axial direction, the difference between the outer diameter of the central part and the outer diameters of both ends, and the length in the axial direction are within the same range as the dimensions of the first liquid removal roller. When the second liquid-cutting roller is a crown roll, the second liquid-cutting step preferably involves the film after the liquid treatment step passing through the second liquid-cutting roller while deforming in an arc shape to follow the bulge of the second liquid-cutting roller, and simultaneously cutting the film by blowing gas onto the first surface of the film. The second surface of the film is the surface that contacts the second liquid-cutting roller.

[0029] <Circulation Process> In this embodiment, if the film is a laminated film having a base film and a coating layer, and the liquid treatment process is a process of removing the coating layer, the liquid treatment method according to this embodiment preferably includes a step of filtering the water containing the coating layer removed in the liquid treatment process and circulating it to a pump. The means for filtering the water containing the coating layer is, for example, a filter. The water circulated to the pump is preferably reused as pressurized water used in the liquid treatment process.

[0030] <Film Recovery Process> The film recovery process involves winding the liquid-drained film into a roll for recovery. The film is recovered using a known method.

[0031] [Second Embodiment] [Film Liquid Processing Apparatus] In the second embodiment, the X-axis, Y-axis, and Z-axis are orthogonal to each other, the X-axis and Y-axis are axes in a predetermined plane, and the Z-axis is an axis orthogonal to the predetermined plane. Furthermore, in the second embodiment, when directions are indicated based on the view from the front direction of Figure 5, which is parallel to the Y-axis, "up" is the direction of the Z-axis arrow and "down" is the opposite direction, "right" is the direction of the X-axis arrow and "left" is the opposite direction, and "front" is the front direction of Figure 3, which is parallel to the Y-axis and "back" is the opposite direction. Also, in Figure 5, the side closer to the feed shaft 10 is called the "upstream side", and the side closer to the winding shaft 40 is called the "downstream side".

[0032] Figure 5 is a schematic diagram of the liquid processing apparatus 100 for film according to the second embodiment. The liquid processing apparatus 100 is a device that removes the coating layer from a laminated film using a processing liquid (an example of liquid processing) and drains the liquid from the film after the coating layer has been removed. In the second embodiment, the case in which the laminated film 90A shown in Figure 2 is used as the film will be described.

[0033] The liquid processing apparatus 100 according to the second embodiment includes a dispensing shaft 10 that dispenses a film (in the case of Figure 5, a laminated film 90A) from a film roll in which the film is wound in a roll shape, a liquid processing unit 30 located downstream of the dispensing shaft 10 that processes the film using a processing liquid, a first liquid de-liquid unit 801 located downstream of the liquid processing unit 30 that de-liquidates the film processed in the liquid processing unit 30, and a winding shaft 40 located downstream of the first liquid de-liquid unit 801 that winds the film de-liquidated in the first liquid de-liquid unit 801 into a roll shape. In the liquid processing apparatus 100, the processing liquid is water. The liquid processing apparatus 100 also includes a second liquid de-liquid unit 82A located downstream of the first liquid de-liquid unit 801 that de-liquidates the first surface 9a of the film. The liquid processing apparatus 100 also includes a water recovery and recycling device 60, a residual detection device 75, nip rollers NR1 and NR2, and a plurality of guide rollers GR. A known roller can be used as the guide roller GR.

[0034] The liquid processing apparatus 100 according to the second embodiment includes a first liquid removal section 801 (a first liquid removal roller 81 and a first gas spraying section 81A). As a result, water droplets adhering to the base film 91 are blown away from the center to both ends in the width direction of the base film 91 by the gas spraying from the first gas spraying section 81A and guided by the inclined surface of the first liquid removal roller 81, and are released to the outside of the first liquid removal roller 81. Therefore, according to the liquid processing apparatus 100 according to the second embodiment, liquid adhering to the base film 91 can be efficiently removed roll-to-roll.

[0035] The components of the liquid processing apparatus 100 according to the second embodiment will now be described.

[0036] <Feeding shaft 10> The feeding shaft 10 feeds out the laminated film 90A from the film roll in which the film is wound in a roll shape. The feeding shaft 10 is connected to a drive roller (not shown).

[0037] <Liquid Processing Unit 30> The liquid processing unit 30 is located downstream of the feed shaft 10 and processes the laminated film 90A using a processing liquid. In the second embodiment, the liquid processing unit 30 includes a backup roller 20, a spray unit 31, and a pressurized water supply unit 50.

[0038] (Backup roller 20) The backup roller 20 is positioned downstream of the feed shaft 10 and transports the laminated film 90A downstream.

[0039] (Injection section 31) The injection section 31 includes one or more liquid nozzles positioned opposite the backup roller 20, and injects pressurized water from one or more liquid nozzles onto the coating layer 92 of the laminated film 90A as the laminated film 90A passes over the backup roller 20. In the injection section 31, when viewed in a cross-section perpendicular to the central axis 20a of the backup roller 20, it is preferable that the central axes of the one or more nozzles in the injection section 31 are perpendicular to the tangent to the backup roller 20. The injection section 31 is located in the injection chamber 301 and is configured so that the injected water is guided to the second tank 63 of the water recovery and regeneration device 60 via the outlet 1a.

[0040] The shape of the liquid nozzle is not particularly limited, but it is preferably a constricted flow nozzle. A constricted flow nozzle is a nozzle that ejects water from a constricted outlet, such as an orifice or a flow nozzle. When the liquid nozzle is a constricted flow nozzle, the inner diameter of the nozzle outlet is the inner diameter of the constricted section. The nozzle pattern is not particularly limited, but examples include a flat pattern (ejection in a fan shape from the outlet), a full cone pattern (ejection in a cone shape from the outlet), and a straight pattern (ejection in a linear shape from the outlet). Among these, a flat pattern is preferred. As shown in Figure 5, when removing the coating layer with a roll-to-roll method, a flat pattern can break up and remove the coating layer with fewer nozzles and less water compared to a straight pattern.

[0041] (Pressurized water supply unit 50) The pressurized water supply unit 50 pressurizes water and supplies pressurized water W3 to the injection unit 31. The pressurized water supply unit 50 includes a pump (in the case of Figure 5, a supply pump 51), and the injection unit 31 is connected to the pump. The pressurized water supply unit 50 is, for example, a known pressurized water generator. The pressurized water supply unit 50 comprises a water source 55, a first tank 53 for storing water W1 supplied from the water source 55, piping 54 connecting the water source 55 and the first tank 53, and a supply pump 51. The supply pump 51 is connected to tanks 53 and 63 via piping 531 and 631, respectively, and is also connected to the injection unit 31 via piping 511. The second tank 63 stores used and recycled water (also referred to as recycled water W2). In the pressurized water supply unit 50, water W1 stored in the first tank 53 and recycled water W2 stored in the second tank 63 are used to generate pressurized water. The supply pump 51 pressurizes the water W1 and recycled water W2 and supplies the pressurized water W3 to the injection unit 31.

[0042] <First liquid removal section 801> The first liquid removal section 801 is located downstream of the liquid processing section 30 and removes liquid from the base film 91 processed in the liquid processing section 30. Figure 4 is a cross-sectional view of the first liquid removal section 801 as seen from the upstream side. The upstream side is the upstream side with respect to the transport direction of the laminated film 90A. The first liquid removal section 801 has a first liquid removal roller 81 whose outer diameter at the axial center is larger than the outer diameter at both ends in the axial direction, and a first gas spraying section 81A. The first gas spraying section 81A includes one or more first gas nozzles located opposite the first liquid removal roller 81, and sprays gas onto the second surface 9b side (second surface 9c of the base film) opposite to the first surface 9a of the film (in the case of Figure 5, the base film 91) as the film passes the first liquid removal roller 81, while in contact with the first surface 9a of the film. In the first gas spraying section 81A, it is preferable that at least one of the one or more first gas nozzles is positioned to face the first liquid removal roller 81 at the position of its maximum diameter (outer diameter R1 in Figure 4). For the first gas spraying section 81A, for example, a known air nozzle can be used. The shape of the air nozzle is not particularly limited. For the first liquid removal roller 81, the first liquid removal roller described in the first liquid removal process can be used.

[0043] <Second liquid removal section 82A> The second liquid removal section 82A is located downstream of the first liquid removal section 801 and removes liquid from the first surface 9a of the base film that is opposite to the second surface 9c of the base film that has been removed by the first liquid removal section. In the second embodiment, the second liquid removal section 82A is a residue removal device. The residue removal device is not particularly limited, but examples include a water-removing nozzle and a dryer. The residue removal device is preferably located on the side of the first surface 9a of the base film 91. In the case of Figure 5, the residue removal device is a water-removing nozzle combined with a backup roller with a flat side surface.

[0044] <Water Recovery and Recycling Device 60>The water recovery and recycling device 60 separates water and the coating layer (detachment product) by passing the water ejected from the injection part 31 through the filtration filter 71. The water recovery and recycling device 60 includes a second tank 63, a filtration filter 71, and a recovery pump 61 disposed between the second tank 63 and the filtration filter 71. The second tank 63 is connected to the supply pump 51 via a pipe 631.

[0045] <Residual Detection Device 75>The residual detection device 75 is a device that detects the residue of the coating layer and is disposed on the downstream side of the backup roller 20 and the upstream side of the winding shaft 40. The residual detection device 75 is, for example, a film thickness gauge that measures the film thickness of the coating layer. The residual detection device 75 may have not only the function of detecting the residue of the coating layer but also a foreign matter detection function.

[0046] <Winding Shaft 40> The winding shaft 40 is disposed on the downstream side of the first liquid drainage part 801 and winds the liquid-drained base material film 91 in a roll shape. The winding shaft 40 is connected to a drive roller (not shown).

[0047] [Third Embodiment] [Film Liquid Processing Apparatus] A film liquid processing apparatus 101 according to the third embodiment will be described. In the third embodiment, the differences from the second embodiment will be described in detail, and explanations of similar matters will be omitted or simplified by using the same reference numerals. Figure 6 is a schematic diagram of the film liquid processing apparatus 101 according to the third embodiment. The liquid processing apparatus 101 according to the third embodiment includes a second liquid removal section 802 as a second liquid removal section. Except for this point, the configuration is the same as in the second embodiment. The second liquid removal section 802 is arranged downstream of the first liquid removal section 801 and removes liquid from the first surface 9a of the base film 91. In the third embodiment, the second liquid removal section 802 has a second liquid removal roller 82 and a second gas spraying section 82B. The second gas spraying section 82B includes one or more second gas nozzles positioned opposite the second liquid removal roller 82, and sprays gas onto the first surface 9a of the film (in the case of Figure 6, the base film 91) as the film passes the second liquid removal roller 82 while in contact with the second surface 9b of the film. Preferably, the outer diameter of the central part of the second liquid removal roller 82 in the axial direction is larger than the outer diameter of both ends in the axial direction. The liquid processing apparatus 101, by including the second liquid removal section 802 (second liquid removal roller 82 and second gas spraying section 82B), operates in the same manner as the first liquid removal section 801, causing water droplets adhering to the base film 91 to be blown away from the center to both ends in the width direction of the base film 91 by the spraying of gas by the second gas spraying section 82B and guided by the inclined surface of the second liquid removal roller 82, and released to the outside of the first liquid removal roller 81. This allows for efficient removal of liquid adhering to both sides of the base film. For the second gas spraying section 82B, for example, a known air nozzle can be used. For the second liquid removal roller 82, the first liquid removal roller described in the first liquid removal step can be used. The first gas spraying section 81A and the second gas spraying section 82B may have the same configuration or different configurations. The first liquid removal roller 81 and the second liquid removal roller 82 may have the same configuration or different configurations.

[0048] The present invention is not limited to the above-described embodiments. The present invention can include modifications, improvements, etc. within the scope that can achieve the object of the present invention. For example, in the second embodiment, the arrangements of the first liquid cutoff portion 801 and the second liquid cutoff portion 82A may be interchanged, and the second liquid cutoff portion 82A may be configured to first cutoff the first surface 9a of the base material film 91, and then the first liquid cutoff portion 801 may cutoff the second surface 9c of the base material of the base material film 91. Similarly, in the third embodiment, the arrangements of the first liquid cutoff portion 801 and the second liquid cutoff portion 802 may be interchanged, and the second liquid cutoff portion 802 may be configured to first cutoff the first surface 9a of the base material film 91, and then the first liquid cutoff portion 801 may cutoff the second surface 9c of the base material of the base material film 91. For example, in the second and third embodiments, an example having two liquid cutoff portions has been described, but the liquid cutoff portion may include only the first liquid cutoff portion 801. Further, the structure of the first liquid cutoff portion 801 is not limited to that shown in FIG. 4.

[0049] The configuration of the film will be described.

[0050] 〔Film〕The film used in the above-described embodiments may be a single-layer film or a laminated film. The configuration of the laminated film is not particularly limited, but it preferably has a base material film and a coating layer. As the single-layer film and the base material film, the resin films described later can be used. The coating layer may be a single layer or a multi-layer composed of two or more coating layers of the same or different types.

[0051] Hereinafter, the case where the film is a laminated film having a base material film and a coating layer will be mainly described. From the viewpoint of facilitating the removal of the coating layer from the laminated film and recovering the remaining base material film, the base material film and the coating layer preferably have a configuration in which they are directly laminated. Here, "directly laminated" refers to a configuration in which, for example, the base material film and the coating layer are in direct contact with each other without having another layer therebetween.

[0052] <Base Film> The base film used is a resin film on which the resin component intended for recovery has been formed. Suitable resin films include polyester films such as polyethylene terephthalate film, polybutylene terephthalate, and polyethylene naphthalate; polyolefin films such as polyethylene film and polypropylene film; polyimide film; polyamide film; polycarbonate film; polyacetate film; ethylene-vinyl acetate copolymer (EVA) film; ethylene-(meth)acrylic acid copolymer film; ethylene-(meth)acrylic acid ester copolymer film; cycloolefin polymer film; polyurethane film; polyphenylene sulfide film; cellophane; and others. Among the base films, polyester film is preferred due to its excellent heat resistance and strength. As for polyester films, polyester films with polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate as the main constituent component are preferred from the viewpoint of facilitating resin recovery and regeneration. In this specification, the main constituent component or principal component means that the proportion of the total mass of the material is 50% by mass or more. Furthermore, the resin film may contain known fillers, colorants, antistatic agents, antioxidants, organic lubricants, and catalysts. The resin film may be transparent or colored as desired. In addition, at least one surface of the base film may be subjected to surface treatment such as sputtering, corona discharge, flame, ultraviolet irradiation, electron beam irradiation, and oxidation etching as needed.

[0053] There are no particular restrictions on the thickness of the base film, but from the viewpoint of strength, rigidity, etc., it is preferably 10 μm to 500 μm, more preferably 15 μm to 300 μm, and even more preferably 20 μm to 200 μm.

[0054] <Coating Layer> The coating layer is preferably a functional layer. Examples of functional layers include a release agent layer, an intermediate layer, a printing layer, a hard coat layer, an easy-adhesion layer, and an adhesive layer. The coating layer may include a functional layer and a ceramic green sheet, or a functional layer, a ceramic green sheet, and a conductive layer. The coating layer preferably includes at least a release agent layer.

[0055] (Release Agent Layer) When the coating layer is a release agent layer, it is preferable that the release agent layer is formed from a release agent composition. The release agent composition used to form the release agent layer is not particularly limited as long as it has release properties, and for example, release agent compositions mainly composed of silicone compounds, fluorine compounds, long-chain alkyl group-containing compounds, thermoplastic resin materials such as olefin resins and diene resins can be used. It is also preferable to use a release agent composition mainly composed of an energy ray curable or thermosetting resin. These release agent compositions may be used individually or in combination of two or more.

[0056] In a release agent composition mainly composed of a silicone compound, the silicone compound may include a silicone compound having an organopolysiloxane as its basic structure. Other examples of the silicone compound include thermosetting silicone compounds such as addition reaction type and condensation reaction type; and energy ray curing silicone compounds such as ultraviolet curing type and electron beam curing type.

[0057] In a release agent composition mainly composed of a fluorine compound, examples of the fluorine compound include fluorosilicone compounds, fluoroboron compounds, and poly(perfluoroalkylene ether) chain-containing compounds.

[0058] In a release agent composition mainly composed of a long-chain alkyl group-containing compound, examples of the long-chain alkyl group-containing compound include polyvinyl carbamate obtained by reacting a long-chain alkyl isocyanate with a polyvinyl alcohol polymer, alkylurea derivatives obtained by reacting a long-chain alkyl isocyanate with polyethyleneimine, or copolymers of long-chain alkyl (meth)acrylates. Furthermore, a long-chain alkyl-modified alkyd resin obtained by a condensation reaction of a polyhydric alcohol and a polybasic acid, using a long-chain fatty acid as a modifying agent, may also be used.

[0059] Preferably, the release agent composition mainly composed of an energy-ray curable resin contains, for example, an energy-ray curable compound having a reactive functional group selected from a (meth)acryloyl group, an alkenyl group, and a maleimide group, and a polyorganosiloxane. In the release agent layer formed by this release agent composition, since the energy-ray curable compound and the polyorganosiloxane have different molecular structures, polarities, and molecular weights, components derived from the polyorganosiloxane segregate near the outer surface of the release agent layer before curing, and then the segregation is fixed by curing with energy rays. This improves the release properties of the release agent layer. The release agent composition mainly composed of an energy-ray curable resin may further contain a photopolymerization initiator.

[0060] Examples of release agent compositions mainly composed of thermosetting resins include release agent compositions mainly composed of melamine resin and release agent compositions mainly composed of epoxy resin. Examples of release agent compositions mainly composed of melamine resin include a composition containing melamine resin as the main component, an acid catalyst for thermosetting the melamine resin, and a polyorganosiloxane that imparts release properties to the release agent layer. Examples of release agent compositions mainly composed of epoxy resin include a composition containing epoxy resin as the main component, an acid or basic thermosetting catalyst for thermosetting the epoxy resin, and a polyorganosiloxane that imparts release properties to the release agent layer. Before curing, components derived from polyorganosiloxane segregate near the outer surface of the release agent layer, and then the segregation is fixed after curing. This improves the release properties of the release agent layer.

[0061] Furthermore, the coating layer may contain other additives in addition to the resin components mentioned above. Examples of other additives include anti-aging agents, light stabilizers, flame retardants, conductive agents, antistatic agents, and plasticizers.

[0062] The thickness of the coating layer can be selected as appropriate and is not particularly limited, but for example, it is preferably 0.02 μm to 5 μm, more preferably 0.03 μm to 2 μm, and even more preferably 0.05 μm to 1.5 μm.

[0063] (Ceramic Green Sheet) When the coating layer includes a release agent layer and a ceramic green sheet, it is preferable that the laminated film is directly laminated in the order of the base film, the release agent layer, and the ceramic green sheet.

[0064] A ceramic green sheet can be obtained, for example, by coating the surface of a coating layer opposite the substrate film with a ceramic slurry, and then drying the ceramic slurry. Coating can be performed using, for example, a slot die coating method or a doctor blade method. The ceramic slurry contains ceramic powder, a binder component, and a solvent. Examples of ceramic powders include dielectric powders such as barium titanate, titanium oxide, alumina, zirconia, zinc oxide, aluminum silicate, and silicon nitride. When dielectric powder is used as the ceramic powder, a green sheet used in the manufacture of multilayer ceramic capacitors (MLCCs) can be obtained (specifically, a green sheet composed of dielectric as the active ingredient). The ceramic powder may also be a ceramic powder other than a dielectric. The thickness of the ceramic green sheet is, for example, 0.1 μm to 10 μm.

[0065] (Conductive layer) When the coating layer includes a release agent layer, a ceramic green sheet, and a conductive layer, it is preferable that the laminated film is directly laminated in this order: the base film, the release agent layer, the ceramic green sheet, and the conductive layer. The conductive layer is not particularly limited, and a conductive layer used in the manufacture of electronic components can be used. The conductive layer is formed on the ceramic green sheet, for example, by applying a conductive paste. The thickness of the conductive layer is, for example, 0.1 μm or more and 5 μm or less.

[0066] (Intermediate layer) The coating layer may include a release agent layer and an intermediate layer. In this case, it is preferable that the intermediate layer and the release agent layer are directly laminated in this order from the base film side. Alternatively, the coating layer may be directly laminated with the intermediate layer, release agent layer and ceramic green sheet in this order from the base film side. Or, the coating layer may be directly laminated with the intermediate layer, release agent layer, ceramic green sheet and conductive layer in this order from the base film side. Examples of intermediate layers include a water-soluble intermediate layer, an alkali-degradable intermediate layer, and a layer that is hydrophilic and water-insoluble.

[0067] (Water-soluble intermediate layer) When the intermediate layer is a water-soluble intermediate layer, examples of water-soluble resins included in the intermediate layer include water-soluble polyvinyl alcohol resin, water-soluble acrylic resin, water-soluble polyester resin, water-soluble polyester urethane resin, water-soluble ethylene ionomer resin, water-soluble polyvinylpyrrolidone resin, water-soluble poly-N-vinylacetamide resin, water-soluble polyamide resin, water-soluble ethylene-vinyl alcohol resin, and water-soluble starch. The content of water-soluble resin in the intermediate layer is preferably 30% by mass or more and 90% by mass or less, and more preferably 40% by mass or more and 80% by mass or less, based on the total mass of the intermediate layer. The upper limit of the content of water-soluble resin in the intermediate layer is 100% by mass.

[0068] (Alkali-degradable intermediate layer) When the intermediate layer is an alkali-degradable intermediate layer, examples of alkali-degradable resins included in the intermediate layer include phenolic resin, polyacrylic acid, polyamide resin, polyester resin, and polylactic acid. The content of alkali-degradable resin in the intermediate layer is preferably 30% by mass or more and 90% by mass or less, and more preferably 40% by mass or more and 80% by mass or less, based on the total mass of the intermediate layer. The upper limit of the content of water-soluble resin in the intermediate layer is 100% by mass.

[0069] (Hydrophilic and water-insoluble layer) When the intermediate layer is a hydrophilic and water-insoluble layer, it is preferable that the intermediate layer is made of a silane compound that exhibits polycondensation by hydrolysis, from the viewpoint of more easily separating the coating layer from the substrate film side surface of the intermediate layer.

[0070] When the intermediate layer is hydrophilic and water-insoluble, the silane compound is preferably a tetraalkoxysilane. More preferred specific examples of the tetraalkoxysilane include tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, and tetrabutoxysilane. Among these, from the viewpoint of ease of availability and reactivity of the hydrolysis reaction, at least one of tetramethoxysilane and tetraethoxysilane, or a mixture of tetramethoxysilane and tetraethoxysilane, is preferred. Commercially available products can also be used as the hydrolysis polycondensate of the silane compound.

[0071] When the intermediate layer contains a hydrophilic and water-insoluble resin (preferably the silane compound), the content of the hydrophilic and water-insoluble resin is preferably 30% to 90% by mass, and more preferably 40% to 80% by mass, relative to the total mass of the intermediate layer. The upper limit for the content of the hydrophilic and water-insoluble resin in the intermediate layer is 100% by mass.

[0072] The thickness of the intermediate layer is preferably 0.01 μm to 1 μm, more preferably 0.03 μm to 0.5 μm, and even more preferably 0.05 μm to 0.3 μm, from the viewpoint of facilitating moisture penetration when the intermediate layer comes into contact with water.

[0073] When the film used in each embodiment is a laminated film, the laminated film is generally used to protect the surface of other functional sheets and various parts used for specific applications during manufacturing, transportation, and storage. After actually fulfilling its role in protecting these parts, it is often peeled off the surface and discarded. Therefore, by using the laminated film, the coating layer and the base film can be easily separated from the laminated film, making it a highly beneficial application from the standpoint of resource conservation and environmental protection.

[0074] 1...First end, 2...Second end, 10...Feeding shaft, 20...Backup roller, 30...Liquid processing unit, 31...Injection unit, 40...Winding shaft, 50...Pressurized water supply unit, 51...Supply pump, 53...First tank, 54...Piping, 55...Water source, 60...Water recovery and recycling device, 61...Recovery pump, 63...Second tank, 71...Filtration filter, 75...Residual detection device, 81...First liquid removal roller, 81A...First gas spraying unit, 82...Second Liquid removal roller, 82A...Second liquid removal section, 82B...Second gas spraying section, 90...Film, 90A, 90B...Laminated film, 91...Base film, 92, 92A...Coating layer, 100, 101...Liquid processing device, 301...Injection chamber, 511, 531, 631...Piping, 801...First liquid removal section, 802...Second liquid removal section, 921...Release agent layer, 922...Ceramic green sheet, 1a...Discharge port, 20a...Central axis.

Claims

1. A method for liquid processing a film, comprising: a step of preparing a film roll in which a film is wound into a roll shape; a step of unwinding the film from the film roll; a liquid processing step of processing the unwinded film with a processing liquid; a first liquid cutting step of passing the film after the liquid processing step through a first liquid cutting roller, the first surface of the film being brought into contact with the first liquid cutting roller, the first surface of the film being brought into contact with the first surface of the film, and blowing gas onto the second surface of the film opposite to the first surface to cut off the liquid; and a film recovery step of winding the film that has been cut off in the first liquid cutting step into a roll shape for recovery.

2. The liquid treatment method for a film according to claim 1, wherein the first liquid removal step is performed while blowing the gas from a direction perpendicular to the axial direction of the first liquid removal roller toward the position of the maximum diameter of the first liquid removal roller.

3. The liquid treatment method for a film according to claim 1 or claim 2, wherein the film is a laminated film having a base film and a coating layer, the liquid treatment step is a step of spraying pressurized water onto the coating layer of the laminated film as the laminated film passes through a backup roller to remove the coating layer, and the film that is de-liquidated in the first de-liquid step after the liquid treatment step is the base film.

4. The liquid treatment method for a film according to claim 3, further comprising the step of filtering the water containing the coating layer removed in the liquid treatment step and circulating it to a pump.

5. The liquid treatment method for a film according to claim 3, wherein the coating layer includes a release agent layer.

6. The liquid treatment method for a film according to claim 5, wherein the coating layer includes a ceramic green sheet.

7. A method for liquid treatment of a film according to claim 1 or claim 2, comprising a second liquid dehydration step different from the first liquid dehydration step, wherein the second liquid dehydration step dehydrates the first surface of the film.

8. The second liquid removal step is a step of passing the film through a second liquid removal roller, which is different from the first liquid removal roller, while bringing the second surface of the film into contact with it, and blowing gas onto the first surface of the film, wherein the outer diameter of the central part in the axial direction of the second liquid removal roller is larger than the outer diameter of both ends in the axial direction, as described in claim 7.

9. A liquid processing apparatus for a film, comprising: a dispensing shaft for dispensing the film from a film roll in which the film is wound in a roll shape; a liquid processing unit disposed downstream of the dispensing shaft for processing the film with a processing liquid; a first de-liquid unit disposed downstream of the liquid processing unit for de-liquidating the film processed in the liquid processing unit; and a rewinding shaft disposed downstream of the first de-liquid unit for winding the film de-liquidated in the first de-liquid unit into a roll shape, wherein the first de-liquid unit comprises a first de-liquid roller having an outer diameter at its axial center greater than the outer diameters at both ends in the axial direction, and a first gas blowing unit, and the first gas blowing unit includes one or more first gas nozzles disposed opposite to the first de-liquid roller, and blows gas onto a second surface of the film opposite to the first surface as the film passes the first de-liquid roller while in contact with the first surface of the film.

10. The liquid processing device for a film according to claim 9, wherein the film is a laminated film having a base film and a coating layer on the second side, the liquid processing device comprises: a backup roller disposed downstream of the feed shaft for transporting the laminated film downstream; an injection unit including one or more liquid nozzles disposed opposite the backup roller for injecting pressurized water from the one or more liquid nozzles onto the coating layer of the laminated film as the laminated film passes the backup roller; and a pressurized water supply unit for pressurizing water and supplying pressurized water to the injection unit, the pressurized water supply unit including a pump, and the injection unit connected to the pump.

11. The liquid processing apparatus for a film according to claim 9 or 10, wherein at least one of the one or more first gas nozzles is positioned to face the position of the maximum diameter of the first liquid cutting roller.

12. The liquid processing apparatus for a film according to claim 9 or claim 10, further comprising a second liquid-draining section disposed downstream of the first liquid-draining section for draining the first surface of the film that has been drained by the first liquid-draining section.

13. The liquid processing apparatus for a film according to claim 12, wherein the second liquid removal section comprises a second liquid removal roller and a second gas spraying section, and the second gas spraying section includes one or more second gas nozzles arranged opposite to the second liquid removal roller, and sprays gas onto the first surface of the film as the film passes the second liquid removal roller while in contact with the second surface side of the film.

14. The liquid processing apparatus for film according to claim 13, wherein the outer diameter of the central part in the axial direction of the second liquid-cutting roller is larger than the outer diameters of both ends in the axial direction.

Images