CN115038922A - Extraction drying device - Google Patents

Abstract

In order to suppress the occurrence of oil stains, the extraction and drying apparatus (1) is provided with: a storage tank (3) for storing the solvent (MC) as the liquid passing through the membrane (F); ) is connected, and is transported through the membrane (F) in the solvent (MC) stored in the storage tank (3); the liquid removal device (11), arranged in the upstream drying chamber (10), will be dried on the upstream side The solvent (MC) adhering to the film (F) being conveyed in the chamber (10) is removed; the downstream side drying chamber (20) is arranged on the downstream side of the upstream side drying chamber (10) in the conveying direction of the film (F) a dividing wall (30) separating the upstream drying chamber (10) and the downstream drying chamber (20) and having a membrane (F) transported from the upstream drying chamber (10) towards the downstream drying chamber (20) The communication part (31) passing through; and the downstream air nozzle (22), which are arranged in the downstream drying chamber (20), and spray the film (F) conveyed in the downstream drying chamber (20) to adjust the temperature gas after.

Description

Extraction drying device

technical field

The present invention relates to an extraction drying device.

Background technique

As a method of manufacturing a porous film such as a separator used in a lithium ion battery, a method of manufacturing using a plasticizer is known. For example, Patent Document 1 and Patent Document 2 describe a method in which a resin composition and a plasticizer are mixed, melted and kneaded at a high temperature to form a sheet, and then drawn with a drawing machine, The plasticizer is extracted with a solvent using an extraction and drying apparatus, and the solvent is dried to produce a porous membrane.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2005-239773

Patent Document 2: Japanese Patent Laid-Open No. 2011-42805

SUMMARY OF THE INVENTION

The problem to be solved by the invention

However, if the plasticizer adhering to the film is extracted with a solvent by the extraction process section of the extraction and drying apparatus, and then dried in the drying process section, depending on the operating conditions, continuous band-like waves may occur on the film surface. pattern or multiple transparent dot-like patterns in the case of oil smears. Oil stain occurs when the solvent adhering to the film in the extraction step is dried in the drying step, and the plasticizer dissolved in the solvent does not vaporize and remains on the film, and the plasticizer partially remains. of. Oil stains have poor appearance and are detected as defects in an inspection apparatus for inspecting the manufactured porous membrane, so there is room for improvement from the viewpoint of suppressing oil stains.

The present invention has been made in view of the above, and an object of the present invention is to provide an extraction and drying apparatus capable of suppressing the occurrence of oil stains.

means to solve the problem

In order to solve the above-mentioned problems and achieve the objectives, an extraction and drying apparatus according to the present invention includes a storage tank for storing the liquid through which the membrane has passed, and an upstream drying chamber that communicates with the storage tank and conveys the liquid stored in the storage tank through the upstream drying chamber. the film in the liquid; a liquid removal device disposed in the upstream drying chamber to remove the liquid adhering to the film conveyed in the upstream drying chamber; and a downstream drying chamber disposed in the film The downstream side of the upstream drying chamber in the conveying direction; a partition wall separating the upstream drying chamber and the downstream drying chamber, and having the film passing through the film conveyed from the upstream drying chamber toward the downstream drying chamber and a downstream air nozzle, which is arranged in the downstream drying chamber, and blows the temperature-regulated gas to the film conveyed in the downstream drying chamber.

Invention effect

The extraction and drying apparatus according to the present invention has the effect of suppressing the occurrence of oil stains.

Description of drawings

FIG. 1 is a schematic diagram showing an apparatus configuration of an extraction drying apparatus according to an embodiment.

FIG. 2 is an explanatory diagram showing a process of drying a film by the extraction and drying apparatus according to the embodiment.

FIG. 3 is a schematic diagram showing an example of a conventional extraction and drying apparatus.

FIG. 4 is an explanatory diagram showing a process of drying the film by the extraction and drying apparatus shown in FIG. 3 .

FIG. 5 is an explanatory diagram of oil stains.

Detailed ways

Hereinafter, embodiments of the extraction and drying apparatus according to the present invention will be described in detail based on the drawings. In addition, this invention is not limited by this embodiment. In addition, among the components of the following embodiments, those skilled in the art can be replaced and can be easily conceived, or those that are substantially the same are included.

[Embodiment]

FIG. 1 is a schematic diagram showing an apparatus configuration of an extraction drying apparatus 1 according to an embodiment. In addition, in the following description, the up-down direction in the normal use state of the extraction-drying apparatus 1 is set as the up-down direction Z of the extraction-drying apparatus 1, and the upper side in the normal use state of the extraction-drying apparatus 1 is set as The upper side of the extraction and drying apparatus 1 will be described assuming that the lower side in the normal use state of the extraction and drying apparatus 1 is the lower side of the extraction and drying apparatus 1 . In addition, the horizontal direction in the normal use state of the extraction-drying apparatus 1 is demonstrated as a horizontal direction also in the extraction-drying apparatus 1. FIG. Furthermore, in the horizontal direction, the direction in which the film F conveyed by the extraction and drying apparatus 1 advances is the longitudinal direction Y of the extraction and drying apparatus 1 , and the direction orthogonal to the longitudinal direction Y in the horizontal direction is the longitudinal direction Y of the extraction and drying apparatus 1 . The width direction X will be described.

<Extraction and drying device 1>

The extraction and drying apparatus 1 according to the present embodiment is mainly used for the manufacture of separators used in lithium ion batteries, and includes an extraction apparatus 2 and a drying apparatus 5 . In the upstream process of the extraction and drying apparatus 1 in the production of the separator, the resin material which is the raw material of the separator and the liquid plasticizer which is the liquid plasticizer are melt-kneaded and formed into a sheet shape, Although the film F as a sheet-like film member was obtained, the extraction and drying apparatus 1 is an apparatus for removing the liquid plasticizer from the obtained film F.

Specifically, as a resin material used as a raw material of the separator, for example, a polyolefin-based resin such as polyethylene or polypropylene is used. Moreover, as a liquid plasticizer, for example, oil, a fluid paraffin, etc. are used. In the process on the upstream side of the extraction and drying apparatus 1 during the production of the separator, these resin materials and the liquid plasticizer are melt-mixed and formed into a sheet, and the sheet is drawn to form a polyolefin resin. A film F of a thin film in which many fine pores are opened, and the liquid plasticizer enters into the fine pores. The extraction and drying apparatus 1 is configured as an apparatus for performing a process of extracting and removing the liquid plasticizer impregnated in the film F from the film F thus formed, so that the liquid plasticizer is pore-opened into the polyolefin-based resin. Many of the micropores are detached to form a membrane F with many micropores perforated.

The extraction device 2 included in the extraction-drying device 1 extracts the liquid plasticizer using the solvent MC with respect to the film F sent to the extraction-drying device 1 . Therefore, the extraction apparatus 2 has the storage tank 3 which is a tank of the solvent MC of the liquid, and the solvent MC is stored in the storage tank 3 . As the solvent MC, for example, dichloromethane is used. In the storage tank 3, a plurality of storage tank reels 4 are arranged, and in the extraction device 2, the film F is immersed in the storage tank 3 by winding the film F on the storage tank reel 4 in the storage tank 3. The film F is transported in the solvent MC inside, the liquid plasticizer is extracted, and the liquid plasticizer is removed from the film F. The storage tank 3 serves as a tank for storing the liquid through which the film F passes in this way.

The drying device 5 included in the extraction drying device 1 is disposed on the downstream side of the extraction device 2 in the conveying direction of the film F, and the solvent MC adhering to the film F is dried by the extraction device 2 . That is, the drying apparatus 5 dries the film F, and the solvent MC adhering to the film F is removed from the film F by the extraction apparatus 2 .

The drying device 5 has a drying chamber 6 as a processing chamber for drying the film F, and as the drying chamber 6 , has an upstream drying chamber 10 and a downstream side disposed on the downstream side of the upstream drying chamber 10 in the conveying direction of the film F Drying chamber 20. Between the upstream drying chamber 10 and the downstream drying chamber 20, a partition wall 30 partitioning the upstream drying chamber 10 and the downstream drying chamber 20 is arranged. In the present embodiment, the upstream drying chamber 10 and the downstream drying chamber 20 are arranged adjacent to each other in the horizontal direction with the partition wall 30 interposed therebetween. That is, the upstream drying chamber 10 and the downstream drying chamber 20 are formed by arranging the partition wall 30 dividing the interior space of the drying chamber 6 into two spaces inside one drying chamber 6 and being adjacent to each other with the partition wall 30 interposed therebetween. The film F conveyed from the extraction device 2 to the drying device 5 is conveyed in this order from the extraction device 2 to the upstream drying chamber 10 of the drying device 5 and from the upstream drying chamber 10 to the downstream drying chamber 20 of the drying device 5 .

Of the upstream drying chamber 10 and the downstream drying chamber 20 , the upstream drying chamber 10 communicates with the storage tank 3 , whereby the drying chamber 6 communicates with the extraction device 2 via the storage tank 3 . Specifically, the storage tank 3 is open toward the upper side, the upstream drying chamber 10 is arranged on the upper side of the storage tank 3 , and the lower surface is opened toward the storage tank 3 . In addition, in the state where the solvent MC is stored in the storage tank 3 , the part of the upstream drying chamber 10 that communicates with the storage tank 3 does not directly communicate with the gas environment outside the upstream drying chamber 10 , and becomes a part of the upstream drying chamber 10 . The state of the solvent MC stored in the storage tank 3 is interposed between the inner gas atmosphere and the outer gas atmosphere. In this way, the upstream drying chamber 10 communicates with the storage tank 3 storing the solvent MC, and the film F that has passed through the solvent MC stored in the storage tank 3 can be transported in the upstream drying chamber 10 .

In the upstream drying chamber 10, a liquid removal drum 12, an upstream air nozzle 13, and a temperature adjustment drum 16 are arranged. Among them, the liquid removal drum 12 and the upstream air nozzle 13 are arranged in the upstream drying chamber 10 as a liquid removal device 11 for removing the solvent MC adhering to the film F conveyed by the upstream drying chamber 10 . A plurality of liquid removal drums 12 are arranged on the upper side of the storage tank 3 in the upstream drying chamber 10 , and the plurality of liquid removal drums 12 are each formed in a cylindrical shape, and the axial direction of the column is along the extraction and drying apparatus 1 . The orientation of the width direction X is arranged. In the present embodiment, in the upstream drying chamber 10, the positions in the longitudinal direction Y of the extraction and drying device 1 are substantially the same, and the axial directions of the cylinders are parallel to each other in the vertical direction Z. A liquid removal drum 12 .

One temperature regulation drum 16 is arranged in the upstream drying chamber 10 , is formed in a cylindrical shape like the liquid removal drum 12 , and is arranged in the direction of the width direction X of the extraction and drying apparatus 1 with the axial direction of the column. The diameter of the cylinder of the temperature control drum 16 is formed to be larger than the diameter of the liquid removal drum 12 , and is arranged on the upper side of the liquid removal drum 12 . In other words, the diameter of the cylinder of the liquid removal drum 12 is relatively small, and the diameters of the three liquid removal drums 12 are substantially the same size.

The film F can be wound around the liquid removal reel 12 and the temperature adjustment reel 16 which are formed in a cylindrical shape, respectively. Rotate around the axis. Therefore, the liquid removal roll 12 and the temperature control roll 16 can be conveyed from the storage tank 3 side toward the downstream drying chamber 20 side by rotating the film F in the state wound.

When the film F is wound on the liquid removal roll 12 or the temperature adjustment roll 16, the film F is wound so that both sides of the film F are alternately contacted between the adjacent liquid removal rolls 12 or temperature adjustment rolls 16. around. That is, in a state where the film F is wound around the liquid removal roll 12 or the temperature adjustment roll 16 , for example, two adjacent liquid removal rolls 12 are in contact with the surfaces of the film F which are different from each other. In this way, the film F is wound around the liquid removal reel 12 or the temperature adjustment reel 16, and the adjacent liquid removal reel 12 and the temperature adjustment reel 16 are alternately contacted with respect to both surfaces of the film F. The liquid removal reel 12 and the temperature adjustment reel 16 rotate, and the liquid removal reel 12 and the temperature adjustment reel 16 convey the film F. At this time, the diameter of the cylinder is smaller than that of the temperature regulation drum 16 , and the plurality of liquid removal drums 12 arranged in a row in the vertical direction Z can convey the film F while applying pressure to the film F.

Furthermore, the temperature of the liquid removal drum 12 and the temperature adjustment drum 16 can be adjusted. Specifically, inside the liquid removal drum 12 and the temperature adjustment drum 16 , a flow path for the flow of warm water whose temperature is adjusted by a temperature regulator (not shown) arranged outside the drying chamber 6 is formed, and the warm water flows. It can circulate between the inside of the liquid removal drum 12 and the temperature control drum 16 and the temperature regulator. Thereby, the liquid removal roll 12 and the temperature control roll 16 can adjust the temperature of the surface which contacts the film F to arbitrary temperature by adjusting the temperature or flow volume of the warm water which flows into the inside. For example, the temperature control drum 16 can make the temperature of the contact surface 16a in contact with the film F a temperature equal to or higher than the boiling point of the solvent MC stored in the storage tank 3, and the temperature of the contact surface 16a can be made a temperature equal to or higher than the boiling point of the solvent MC. The film F was conveyed in the state of temperature.

In addition, the upstream air nozzle 13 as the liquid removing device 11 is arranged in the vicinity of the temperature regulation roll 16, and can blow gas to the outer peripheral surface of the temperature regulation roll 16, that is, the surface of the temperature regulation roll 16 on which the film F is conveyed . Thereby, when the film F is conveyed by the temperature control roll 16, the upstream air nozzle 13 can blow gas to the surface on the opposite side of the surface which contacts the temperature control roll 16 of the film F.

In addition, the upstream air nozzle 13 can blow the gas supplied from the upstream drying chamber 10 to the film F. Specifically, in the upstream drying chamber 10, a circulating exhaust duct 14 for discharging the gas in the upstream drying chamber 10 to the outside of the upstream drying chamber 10 is provided in the upper part of the upstream drying chamber 10, The circulating exhaust duct 14 is connected to an upstream-side blower 17 serving as a blower via a blower path 18 . Furthermore, the gas delivery side of the upstream blower 17 is connected to the upstream air nozzle 13 in the upstream drying chamber 10 via the air supply path 18 , and the gas supplied from the upstream blower 17 can be supplied to the upstream air nozzle 13 . Therefore, the upstream side blower 17 can supply the gas obtained by suctioning the gas from the circulating exhaust duct 14 side to the upstream side air nozzle 13 via the air blowing path 18 .

Thereby, the upstream side air nozzle 13 can blow out the gas supplied from the upstream side blower 17 in the upstream side drying chamber 10. Therefore, the upstream side air nozzle 13 can blow the gas in the upstream side drying chamber 10 discharged from the circulating exhaust duct 14 into the upstream side drying chamber 10 , in other words, the upstream side air nozzle 13 can make the gas in the upstream side drying chamber 10 The gas circulates and is blown toward the film F in the upstream drying chamber 10 .

At this time, the upstream side blower 17 can adjust the temperature of the gas obtained by suctioning the gas from the circulating exhaust duct 14 side and supply it to the upstream side air nozzle 13 . Specifically, the upstream blower 17 includes a heating device (not shown) for heating the gas and a cooling device (not shown) for cooling the gas, and the upstream blower 17 heats the gas by the heating device or cools the gas by the cooling device. By cooling the gas, the temperature of the gas can be set to a predetermined temperature. The upstream-side blower 17 can supply the gas whose temperature has been adjusted in this way to the upstream-side air nozzle 13 , and the upstream-side air nozzle 13 can blow the gas in the upstream-side drying chamber 10 whose temperature has been adjusted toward the film F in the upstream-side drying chamber 10 . .

The partition wall 30 which is arranged between the upstream drying chamber 10 and the downstream drying chamber 20 and separates the upstream drying chamber 10 and the downstream drying chamber 20 has a film conveyed from the upstream drying chamber 10 toward the downstream drying chamber 20 The communicating portion 31 through which F passes. The communication portion 31 is formed in the partition wall 30 and is a hole that communicates the upstream drying chamber 10 and the downstream drying chamber 20 . Moreover, the communication part 31 is formed in the vicinity of the temperature control drum 16 arrange|positioned in the upstream drying chamber 10 of the partition wall 30.

In the communication part 31 which the partition wall 30 has, the intermediate roll sealing apparatus 40 which is a roll sealing apparatus provided with the sealing roll 41 and the sealing member 42 is arrange|positioned. Among them, the sealing roll 41 is formed in a cylindrical shape like the liquid removing roll 12 or the temperature adjusting roll 16 arranged in the upstream drying chamber 10 , and the axial direction of the column is along the width direction of the extraction and drying apparatus 1 . X orientation configuration. The film F can be wound around the sealing roll 41 in the same manner as the liquid removal roll 12 and the temperature adjustment roll 16 arranged in the upstream drying chamber 10 , and the film F can be wound on the opposite surface of the film F which is in contact with the temperature adjustment roll 16 . The side surfaces are wound around the seal roll 41 in a state of contact with each other.

In addition, the seal drum 41 can be rotated about the axis of the cylinder by the power supplied from a power source such as a motor. Therefore, by rotating the seal roll 41 in a state where the film F is wound, the wound film F can be conveyed from the upstream drying chamber 10 side to the downstream drying chamber 20 side.

Furthermore, inside the sealing drum 41 , like the liquid removal drum 12 and the temperature adjustment drum 16 , a flow of warm water whose temperature is adjusted by a temperature regulator (not shown) arranged outside the drying chamber 6 is formed. The flow path is formed, and warm water can circulate between the inside of the sealing drum 41 and the temperature controller. Thereby, the sealing roll 41 can adjust the temperature of the surface in contact with the film F to an arbitrary temperature by adjusting the temperature or flow rate of the warm water flowing into the inside.

In addition, the seal members 42 are arranged at two places on both sides of the seal roll 41 in the vertical direction Z, and are arranged at positions close to the surface of the seal roll 41 . The sealing member 42 is formed such that an approaching portion that is close to the sealing drum 41 and an expanding portion that is a space formed between the sealing drum 41 and the sealing drum 41 are alternately arranged in the circumferential direction around the axis of the sealing drum 41 . The so-called labyrinth seal.

The film F conveyed from the upstream drying chamber 10 toward the downstream drying chamber 20 through the communication portion 31 passes through one of the sealing members 42 disposed on both sides of the seal roll 41 in the vertical direction Z. The member 42 and the seal roll 41 are conveyed from the upstream drying chamber 10 to the downstream drying chamber 20 . In the present embodiment, the film F is conveyed from the upstream drying chamber 10 to the downstream drying chamber 20 through between the sealing member 42 arranged on the lower side of the sealing roll 41 and the sealing roll 41 . Since the film F passes between the sealing member 42 and the sealing roll 41 in this way, the sealing member 42 is close to the film F and faces the surface of the film F conveyed by the sealing roll 41 on the side of the sealing roll 41 . face on the opposite side.

In the downstream drying chamber 20, the temperature control drum 21 and the downstream air nozzle 22 are arranged. Among them, a plurality of temperature regulation drums 21 are arranged in the downstream drying chamber 20 , and the plurality of temperature regulation drums 21 are each formed in a cylindrical shape, and the axial direction of the column is along the width direction X of the extraction and drying device 1 . towards configuration. In the present embodiment, four temperature control drums 21 are arranged in the downstream drying chamber 20 .

The diameters of all the cylinders of the four temperature regulation rolls 21 arranged in the downstream drying chamber 20 are formed to be approximately the same size as the diameter of the temperature regulation rolls 16 arranged in the upstream drying room 10 . The film F can be wound around the temperature regulation roll 21 arranged in the downstream drying chamber 20, and all the four temperature regulation rolls 21 can be rotated around the axis of the cylinder by power supplied from a power source such as a motor. Therefore, by rotating the four temperature control reels 21 in the state where the film F is wound, the wound film F can be positioned toward the upstream drying chamber 10 in the longitudinal direction Y from the side where the upstream drying chamber 10 is located. Conveying on the opposite side of the side.

Specifically, when the film F is wound around the temperature control rolls 21, the film F is brought into contact with the mutually different surfaces of the film F between the adjacent temperature control rolls 21 among the four temperature control rolls 21. It is wound onto 4 tempering reels 21 . In addition, among the four temperature regulation rolls 21 arranged in the downstream drying chamber 20, the temperature regulation roll 21 arranged closest to the upstream drying room 10, the film F and the intermediate roll sealing device 40 The seal roll 41 is wound in a state in which the surface on the opposite side to the surface with which the seal roll 41 is in contact is in contact with each other. The temperature control roll 21 can be wound around the film F by rotating the temperature control roll 21 in a state of being wound around the four temperature control rolls 21 in this way.

In addition, in the inside of the temperature regulation drum 21 , like the liquid removal drum 12 and the temperature regulation drum 16 arranged in the upstream drying chamber 10 , there is formed a temperature controller arranged outside the drying chamber 6 . (illustration omitted) The flow path in which the temperature-adjusted warm water flows, and the warm water can circulate between the inside of the temperature-adjustment drum 21 and the temperature controller. Thereby, the temperature control roll 21 can adjust the temperature of the surface which contacts the film F to arbitrary temperature by adjusting the temperature or flow volume of the warm water which flows into the inside.

In addition, the downstream air nozzles 22 arranged in the downstream drying chamber 20 are arranged in the vicinity of the sealing drum 41 included in the intermediate drum sealing device 40 and the four temperature control drums arranged in the downstream drying chamber 20 Among the 21, these two places are in the vicinity of the temperature control drum 21 closest to the upstream drying chamber 10. The downstream air nozzle 22 can blow gas to the outer peripheral surfaces of the seal roll 41 and the temperature control roll 21 , that is, the surfaces of the seal roll 41 and the temperature control roll 21 on which the film F is conveyed. As a result, the downstream air nozzle 22 is able to connect the film F with the sealing roll 41 or the temperature adjusting roll 21 when the film F is conveyed in the sealing roll 41 or the temperature adjusting roll 21 of the intermediate roll sealing device 40 . The gas is sprayed on the surface on the opposite side of the contact surface.

At this time, the sealing roll 41 of the intermediate roll sealing device 40 and the temperature adjusting roll 21 closest to the upstream drying chamber 10 among the four temperature adjusting rolls 21 arranged in the downstream drying chamber 20 are relative to the film F. contact with mutually different faces. Therefore, the downstream side air nozzles 22 arranged at two places in the downstream side drying chamber 20 can blow gas on mutually different surfaces of the film F. As shown in FIG.

Moreover, the downstream air nozzle 22 arrange|positioned in the downstream drying chamber 20 can blow the temperature-regulated gas to the film F. Specifically, the downstream side air nozzle 22 is connected to the downstream side blower 27 as a blower arranged outside the downstream side drying chamber 20 via the blower path 28 . The downstream side blower 27 can suck the gas around the downstream side blower 27 , and can supply the sucked gas to the downstream side air nozzle 22 in the downstream side drying chamber 20 .

At this time, the downstream side blower 27 can adjust the temperature of the sucked gas, and can supply the temperature-adjusted gas to the downstream side air nozzle 22 through the ventilation path 28 . That is, the downstream blower 27 includes a heating device (not shown) for heating the gas and a cooling device (not shown) for cooling the gas, and the downstream blower 27 heats the gas by the heating device or cools the gas by the cooling device. By cooling, the temperature of the gas can be set to the set temperature. The downstream side blower 27 can supply the gas whose temperature has been adjusted in this way to the downstream side air nozzle 22 , and the downstream side air nozzle 22 can blow the gas whose temperature has been adjusted by the downstream side blower 27 to the film F in the downstream side drying chamber 20 .

Moreover, in the downstream drying chamber 20, the exhaust duct 23 which discharges the gas in the downstream drying chamber 20 to the outside of the downstream drying chamber 20 is arrange|positioned. The exhaust duct 23 is arranged on the bottom surface which is the lower surface of the downstream drying chamber 20 . The exhaust duct 23 is connected to an exhaust blower 24 as an air blower, and the exhaust blower 24 can discharge the gas in the downstream drying chamber 20 from the exhaust duct 23 to the outside of the downstream drying chamber 20 . Further, between the drying chamber 20 on the downstream side of the exhaust duct 23 and the exhaust blower 24, a damper 25 for adjusting the flow rate of the gas flowing through the exhaust duct 23 is arranged. Therefore, the flow rate of the gas when the gas in the downstream drying chamber 20 is discharged from the exhaust duct 23 to the outside of the downstream drying chamber 20 can be adjusted by the damper 25 .

On a portion of the downstream drying chamber 20 on the opposite side to the side where the upstream drying chamber 10 in the longitudinal direction Y is located, the film F processed by the extraction drying apparatus 1 is formed from the downstream drying chamber 20 to the downstream. The side drying chamber 20 is sent out of the opening portion 26 through which the film F is sent out to the process subsequent to the extraction and drying apparatus 1 . At the opening 26 of the downstream drying chamber 20, an outlet-side roll seal device 45 as a roll seal device including a seal roll 46 and a seal member 47 is disposed.

Here, the seal roll 46 is formed in a cylindrical shape like the seal roll 41 of the intermediate roll seal device 40 , and is arranged with the axial direction of the column along the width direction X of the extraction and drying apparatus 1 . The film F can be wound on the seal roll 46 similarly to the seal roll 41 of the intermediate roll seal device 40 . When the film F is wound around the sealing roll 46 of the exit-side roll sealing device 45, the distance between the film F and the four temperature-adjusting rolls 21 arranged in the downstream drying chamber 20 is the distance from the exit-side roll sealing device 45 is wound in a state in which the surface on the opposite side to the surface with which the nearest temperature regulation drum 21 is in contact is in contact with each other.

In addition, the seal drum 46 of the outlet-side drum seal device 45 is different from the seal drum 41 of the intermediate drum seal device 40 in that power is not supplied from a power source such as a motor, but is caused by an external force acting on the seal drum 46 While spinning the so-called free reel. In addition, unlike the seal roll 41 of the intermediate roll seal device 40, the seal roll 46 of the exit-side roll seal device 45 is not temperature-regulated.

In addition, the seal members 47 of the outlet-side roll sealing device 45 are arranged at two places on both sides of the seal roll 46 in the vertical direction Z, and are arranged at positions close to the surface of the seal roll 46 . Similar to the sealing member 42 of the intermediate roll sealing device 40 , the sealing member 47 of the outlet-side roll sealing device 45 is formed so as to be alternately arranged adjacent to the sealing roll 46 in the circumferential direction centered on the axis of the sealing roll 46 . and a so-called labyrinth seal as an inflated portion formed in the space between the seal drum 46 .

The film F conveyed from the inside of the downstream drying chamber 20 to the outside of the downstream drying chamber 20 through the opening 26 of the downstream drying chamber 20 passes through two places on both sides of the seal roll 46 arranged in the vertical direction Z. One of the sealing members 47 and the sealing drum 46 is conveyed from the inside of the downstream drying chamber 20 to the outside of the downstream drying chamber 20 . In the present embodiment, the film F is conveyed from the inside of the downstream drying chamber 20 to the outside of the downstream drying chamber 20 through between the sealing member 47 arranged on the upper side of the seal roll 46 and the seal roll 46 . Since the film F passes between the sealing member 47 and the sealing roll 46 in this way, the sealing member 47 is close to the film F and faces the surface of the film F conveyed by the sealing roll 46 on the side of the sealing roll 46 . face on the opposite side.

In this embodiment, a control device 50 , an indoor sensor 51 , and an outdoor sensor 52 are further provided. Among them, the indoor sensor 51 is arranged in the downstream drying chamber 20 and can detect the pressure of the gas environment in the downstream drying chamber 20 . In addition, the outdoor sensor 52 is arranged outside the extraction and drying apparatus 1 and can detect the atmospheric pressure outside the extraction and drying apparatus 1 . That is, the outdoor sensor 52 can detect the pressure of the gas environment outside the downstream drying chamber 20 .

In addition, the control device 50 can perform various controls of the extraction drying device 1 . The control device 50 includes a CPU (Central Processing Unit) that performs arithmetic processing, a RAM (Random Access Memory), a ROM (Read Only Memory), and the like that function as a memory for storing various kinds of information. All or part of each function of the control device 50 is realized by loading an application program held in the ROM into the RAM, executing it by the CPU, and reading and writing data in the RAM or the ROM. The control device 50 may be used exclusively for the extraction-drying device 1 , may be shared with other devices, or may control the entire system in which the extraction-drying device 1 is assembled.

Both the indoor sensor 51 and the outdoor sensor 52 are connected to the control device 50 , and the detection results of the indoor sensor 51 and the outdoor sensor 52 can be acquired by the control device 50 . In addition, the upstream blower 17, the downstream blower 27, and the damper 25 are also connected to the control device 50, and the amount of air sent from the upstream blower 17 and the downstream blower 27 and the gas sent from the upstream blower 17 and the downstream blower 27 vary. The temperature and the degree of opening of the damper 25 can be controlled by the control device 50 . Furthermore, the liquid removal drum 12 or the temperature adjustment drum 16 arranged in the upstream drying chamber 10 , the sealing drum 41 included in the intermediate drum sealing device 40 , and the temperature adjustment drum 21 arranged in the downstream drying chamber 20 The rotational speed and temperature of the s can also be controlled by the control device 50 .

<Function of Extraction Drying Device 1>

The extraction and drying apparatus 1 according to the present embodiment includes the above-described configuration, and the operation thereof will be described below. The extraction and drying apparatus 1 performs extraction and drying of the membrane F in the manufacturing process of the porous membrane F used for the separator of a lithium ion battery or the like. When the extraction and drying of the film F is performed using the extraction and drying apparatus 1 , before the operation of the extraction and drying apparatus 1 is started, the film F is first wound around the liquid removal reel 12 or the temperature adjustment reel 16 or the like included in the extraction and drying apparatus 1 . On each roll, the film F can be conveyed by these rolls. Thereby, by rotating each roll, the film F can be conveyed continuously.

By starting the operation of the extraction and drying apparatus 1 in the state where the film F is arranged in this way, the polyolefin-based resin formed in the process on the upstream side in the conveying direction of the film F has many fine pores and is plasticized in a liquid state. The film F of the thin film in which the agent has entered the fine pores is transported to the extraction and drying apparatus 1 . The film F is first conveyed to the extraction device 2 included in the extraction and drying device 1, and in the extraction device 2, the film F is immersed and stored in the storage tank while being conveyed by the storage tank reel 4 arranged in the storage tank 3. In the solvent MC in the tank 3, the liquid plasticizer is removed from the film F.

The film F from which the liquid plasticizer has been removed is conveyed from the extraction device 2 to the drying device 5 . In the drying device 5 , the film F is dried in the drying chamber 6 while the film F is being transported, and the solvent MC adhering to the film F is removed from the film F. Here, when the film F is conveyed by the drying device 5, the film F is conveyed in a state where tension is generated. Thereby, the surface pressure between the film F and each reel which is in contact with the film F and conveys the film F is ensured, and the frictional force between the film F and the reel is ensured by the surface pressure. Therefore, by rotating the reel in a state in which frictional force is generated between the film F and the reel, the film F can be conveyed with the rotation of the reel by the frictional force between the two.

FIG. 2 is an explanatory diagram showing a process of drying the film F by the extraction drying apparatus 1 according to the embodiment. In order to remove the solvent MC adhering to the film F from the film F, the film F conveyed from the extraction device 2 to the drying device 5 is dried from the storage tank 3 to the upstream side located above the storage tank 3 and communicated with the storage tank 3 chamber 10 delivery. A plurality of liquid removal reels 12 are arranged above the storage tank 3 in the upstream drying chamber 10 , and the film F conveyed from the storage tank 3 to the upstream drying chamber 10 is first conveyed to the liquid removal reel 12 . Therefore, since the film F conveyed to the liquid removal reel 12 is the film F immediately after being immersed in the solvent MC in the storage tank 3, the film F is removed to the surface with a large amount of the solvent MC attached to the surface. The liquid reel 12 is conveyed.

Here, in the storage tank 3, the film F is immersed in the solvent MC for the purpose of extracting the liquid plasticizer from the film F and removing the liquid plasticizer from the film F, but after the liquid plasticizer is extracted by the solvent MC In the case of , the extracted liquid plasticizer is dissolved in the solvent MC. On the other hand, after the film F is immersed in the solvent MC in the storage tank 3, the film F is transported to the upstream drying chamber 10, and the solvent MC adhering to the film F in the state before drying of the solvent MC not only adheres to the On the surface of the film F, the micropores formed in the film F also enter. Therefore, when the liquid plasticizer is dissolved in the solvent MC stored in the storage tank 3, the plasticizer LP, which is the liquid plasticizer dissolved in the solvent MC, also enters the fine pores of the film F. (refer to FIG. 2, S1).

The film F conveyed from the storage tank 3 to the position of the liquid removal roll 12 is conveyed by the liquid removal roll 12 in a state in which the solvent MC and the plasticizer LP are adhered to the surface and enter into the fine pores. The diameter of the liquid removal drum 12 is smaller than that of the temperature adjustment drum 16 and the like, and the contact area between the film F wound on the liquid removal drum 12 and the liquid removal drum 12 becomes small. Therefore, the surface pressure of the contact part of the film F and the liquid removal roll 12 becomes comparatively large. Thereby, the film F conveyed by the liquid removal roll 12 is subjected to a relatively large surface pressure acting between the film F and the liquid removal roll 12, and the solvent MC adhering to the surface of the film F is removed from the film F and the liquid removal roll 12. Bleeding out between the cylinders 12, the solvent MC flows downward.

In addition, a plurality of liquid removal rolls 12 are arranged, and both surfaces in the thickness direction of the film F are brought into contact with a liquid removal roll 12 and conveyed. Therefore, the solvent MC adhering to the surface of the film F permeates from between the film F and the liquid removal roll 12 by the surface pressure between the film F and the liquid removal roll 12 in either of the two surfaces in the thickness direction of the film F out and flow down the side. Therefore, the solvent MC adhering to the surface of the film F which passed the liquid removal roll 12 is removed by the liquid removal roll 12 to some extent.

In addition, by adjusting the temperature and flow rate of the warm water flowing in the liquid removal drum 12, the temperature of the outer peripheral surface of the liquid removal drum 12, that is, the temperature of the part in contact with the film F of the liquid removal drum 12 is increased, and the The temperature of the solvent MC adhering to the surface of the film F increases. Thereby, the vaporization of the solvent MC adhering to the surface of the film F is promoted, and the solvent MC adhering to the surface of the film F can also be removed by vaporizing the solvent MC.

Once the film F conveyed in the upstream drying chamber 10 is removed by the liquid removal roll 12 to some extent, the solvent MC adhering to the surface is removed to a certain extent, and then the film F is moved to the liquid removal roll 12 located in the conveying direction of the film F. The temperature control drum 16 on the downstream side is conveyed at the position where it is arranged. The upstream air nozzle 13 is disposed near the temperature adjustment roll 16 , and the upstream air nozzle 13 sprays the surface of the temperature adjustment roll 16 on which the film F is conveyed during extraction and drying of the film F by the extraction and drying device 1 . gas. Therefore, when the extraction and drying apparatus 1 performs extraction and drying of the film F, the upstream air nozzle 13 blows moist air as a gas supplied from the upstream drying chamber 10 to the film F conveyed by the temperature control reel 16 . wa. The solvent MC on the surface of the film F to which the moist air WA has been blown from the upstream air nozzle 13 is blown away by the moist air WA. As a result, the solvent MC on the surface of the film F to which the moist air WA has been blown from the upstream air nozzle 13 is removed (see FIGS. 2 and S2 ).

In this way, the moist air WA which is the gas blown from the upstream side air nozzle 13 to the film F becomes the gas supplied from the upstream side blower 17 . That is, the gas suction side of the upstream side blower 17 is connected to the circulating exhaust duct 14 provided in the upstream side drying chamber 10 via the air supply path 18. When the upstream side blower 17 operates, the upstream side blower 17 blows the upstream side. The gas in the side drying chamber 10 is sucked from the circulating exhaust duct 14 , and the sucked gas is supplied to the upstream side air nozzle 13 . Thereby, the upstream side air nozzle 13 blows the moist air WA which is the gas supplied from the inside of the upstream side drying chamber 10 to the film F conveyed by the temperature control roll 16 .

Further, by operating the upstream side blower 17, when the gas sucked from the circulating exhaust duct 14 is supplied to the upstream side air nozzle 13, the upstream side blower 17 is heated by the heating device or the cooling device provided in the upstream side blower 17. The temperature is adjusted, and the temperature-adjusted gas is supplied. By blowing the temperature-controlled humid air WA toward the film F from the upstream air nozzle 13, the vaporization of the solvent MC adhering to the surface of the film F is accelerated, and the solvent MC is efficiently blown away.

The temperature adjustment of the gas by the upstream side blower 17 controls the upstream side blower 17 by the control device 50 to operate the heating device or the cooling device provided in the upstream side blower 17 so that the temperature of the gas becomes a preset set temperature. . The set temperature in this case is preferably set within a range from normal temperature to a temperature around the boiling point of the solvent MC. For example, when the boiling point of the solvent MC is about 40°C, the setting temperature is preferably set within a range from normal temperature to about 60°C. The set temperature when the temperature of the gas is adjusted by the upstream blower 17 is determined during the trial operation of the extraction and drying apparatus 1 to efficiently remove the solvent MC adhering to the surface of the membrane F, and the optimum temperature is determined. The optimal temperature setting is the set temperature.

Here, the upstream drying chamber 10 communicates with the storage tank 3 located below the upstream drying chamber 10 , and the storage tank 3 is open to the upstream drying chamber 10 . In addition, the solvent MC is stored in the storage tank 3 . Since the solvent MC is a liquid, it is gradually vaporized by evaporation, and the gaseous solvent MC is gradually accumulated in the upstream drying chamber 10 . As a result, the gas atmosphere in the upstream drying chamber 10 is filled with the solvent gas MCG, which is the solvent MC that becomes a gas. That is, the inside of the upstream drying chamber 10 becomes a gas atmosphere rich in the solvent gas MCG.

Therefore, the humid air WA that is supplied from the upstream drying chamber 10 and blown from the upstream air nozzle 13 also becomes a humid gas containing a large amount of the solvent gas MCG. Therefore, the film F to which the moist air WA has been sprayed from the upstream air nozzle 13 is not dried but the solvent MC on the surface is blown away. In addition, the upstream air nozzle 13 blows the moist air WA supplied from the upstream drying chamber 10 to the film F instead of the gas outside the upstream drying chamber 10 , while making the air in the upstream drying chamber 10 blow. Since the gas is blown while circulating, a gas atmosphere rich in the solvent gas MCG is maintained in the upstream drying chamber 10 .

In addition, when the film F is conveyed by the temperature control roll 16, the temperature and flow rate of the warm water flowing inside the temperature control roll 16 are adjusted so that the temperature of the contact surface 16a of the temperature control roll 16 with the film F becomes The temperature above the boiling point of solvent MC. Thereby, the solvent MC in which the plasticizer LP is dissolved, which has entered the fine pores of the film F, is bumped while the film F conveyed by the temperature control roll 16 is in contact with the contact surface 16a of the temperature control roll 16 . The bumped solvent MC is released to the outside of the film F together with the plasticizer LP dissolved in the solvent MC, and fine pores H are formed at the portion of the film F where the bumped solvent MC containing the plasticizer LP is located.

At this time, since the moist air WA is sprayed through the upstream side air nozzle 13 to the film F conveyed by the temperature control reel 16 , the solvent MC that is bumped and released to the outside of the film F is immediately removed from the film F after being released to the outside of the film F. The moist air WA blown from the upstream side air nozzle 13 is blown away. Thereby, since the plasticizer LP dissolved in the solvent MC is also blown away together with the solvent MC, the plasticizer LP released to the outside of the film F is appropriately removed from the film F without remaining on the film F.

In the upstream drying chamber 10 , the film F after the solvent MC on the surface is not dried and blown away by the moist air WA blown from the upstream air nozzle 13 at the position of the temperature control drum 16 passes through the communication portion of the partition wall 30 31 toward the downstream drying chamber 20 . Here, since the intermediate roll seal 40 is disposed at the communication portion 31 of the partition wall 30 , the gas atmosphere of the upstream drying chamber 10 and the gas atmosphere of the downstream drying chamber 20 are separated by the intermediate roll seal 40 . Therefore, it is difficult to move the gas between the upstream drying chamber 10 and the downstream drying chamber 20 , and the gas atmosphere rich in the solvent gas MCG in the upstream drying chamber 10 passes through the intermediate drum seal 40 to the upstream drying chamber maintained within 10.

Specifically, the intermediate roll sealing device 40 includes a sealing roll 41 that transports the film F, and a sealing member 42 that is close to the sealing roll 41 and has a labyrinth structure; from the upstream drying chamber 10 side to the downstream drying chamber The film F conveyed on the 20 side is conveyed through between the seal roll 41 and the seal member 42 . That is, on the surface side opposite to the surface of the film F which is conveyed by the sealing roll 41 from the upstream drying chamber 10 side to the downstream drying chamber 20 side with the sealing roll 41, the gap with the film F is arranged as The sealing member 42 is extremely small and has a labyrinth configuration. Thereby, the gas rich in solvent gas MCG in the upstream drying chamber 10 is blocked by the sealing member 42 included in the intermediate roll sealing device 40, and only the film F is transported from the upstream drying chamber 10 side to the downstream drying chamber 20 side .

Unlike the upstream drying chamber 10 , the downstream drying chamber 20 does not communicate with the storage tank 3 for storing the solvent MC. Therefore, the amount of solvent gas MCG contained in the gas atmosphere of the downstream drying chamber 20 is reduced, and the gas atmosphere of the downstream drying chamber 20 is reduced. Compared with the upstream drying chamber 10, it becomes dry. Therefore, the film F transported from the upstream drying chamber 10 to the downstream drying chamber 20 by the sealing roll 41 of the intermediate roll sealing device 40 is transported within the downstream drying chamber 20 in a dry gas atmosphere.

Further, in the vicinity of the seal roll 41 of the intermediate roll seal device 40, a downstream air nozzle 22 is arranged, and the downstream air nozzle 22 acts on the seal roll 41 when the extraction and drying apparatus 1 performs extraction and drying of the film F. The surface on which the film F is conveyed is sprayed with dry air DA, which is a gas supplied from outside the downstream drying chamber 20 . Therefore, when extracting and drying the film F by the extraction and drying apparatus 1 , the downstream air nozzle 22 disposed near the seal roll 41 blows dry air DA on the film F conveyed by the seal roll 41 . The film F to which the dry air DA was sprayed from the downstream air nozzle 22 disposed near the seal roll 41 is blown away by the dry air DA to blow away the solvent MC on the surface to which the dry air DA was sprayed.

Furthermore, since the downstream drying chamber 20 is a dry gas atmosphere, the film F conveyed in the downstream drying chamber 20 is easily dried. Therefore, the film F to which the dry air DA has been blown from the downstream air nozzle 22 enters into the fine pores H of the film F near the surface to which the dry air DA has been blown, and the solvent MC in which the plasticizer LP is dissolved passes through. The dry air DA blown from the downstream side air nozzle 22 is easily evaporated. That is, by blowing the dry air DA to the film F from the downstream side air nozzle 22 in a dry gas atmosphere, the film F is rapidly dried. As a result, the plasticizer LP dissolved in the solvent MC is removed from the fine pores H in the vicinity of the surface of the film F where the dry air DA is blown from the downstream air nozzle 22 , and the plasticizer LP dissolved in the solvent MC is removed, and the film F is formed on the film F. Micropore H (refer to FIG. 2, S3).

In the downstream drying chamber 20 , a plurality of temperature regulation rolls 21 are arranged, and the film F conveyed by the sealing roll 41 of the intermediate roll sealing device 40 is sequentially transported by the plurality of temperature regulation rolls 21 . When the film F is conveyed by the plurality of temperature control rolls 21 , the film F conveyed by the sealing roll 41 of the intermediate roll sealing device 40 is firstly transported by the plurality of temperature control rolls 21 in the conveying direction of the film F The temperature-adjusting drum 21 located closest to the sealing drum 41 is conveyed. That is, the film F conveyed by the sealing roll 41 of the intermediate roll sealing device 40 is first conveyed by the temperature adjustment roll 21 located on the most upstream side in the conveyance direction of the film F among the plurality of temperature adjustment rolls 21 .

The downstream air nozzle 22 is arranged near the temperature adjustment drum 21 that is closest to the sealing drum 41 among the plurality of temperature adjustment drums 21 , and the downstream air nozzle 22 extracts the film F by the extraction and drying device 1 . , At the time of drying, dry air DA, which is a gas supplied from the outside of the downstream drying chamber 20 , is sprayed on the surface of the temperature control drum 21 on which the film F is conveyed. Therefore, when extraction and drying of the film F are performed by the extraction and drying apparatus 1 , the downstream air nozzle 22 blows the dry air DA with respect to the film F conveyed by the temperature control reel 21 .

Here, the downstream air nozzle 22 arranged near the seal roll 41 of the intermediate roll sealing device 40 and the temperature regulation roll 21 arranged closest to the seal roll 41 among the plurality of temperature regulation rolls 21 The adjacent downstream side air nozzles 22 can blow dry air DA on mutually different surfaces of the film F. As shown in FIG. Therefore, with respect to the film F conveyed by the temperature adjustment reel 21 located on the most upstream side in the conveyance direction of the film F among the plurality of temperature adjustment reels 21 , the downstream air nozzles are arranged in the vicinity of the temperature adjustment reel 21 . 22 Blows the dry air DA to the surface opposite to the surface on which the dry air DA is sprayed by the downstream side air nozzles 22 arranged in the vicinity of the seal roll 41 .

Thereby, the portion of the film F near the surface where the dry air DA is sprayed from the downstream air nozzle 22 disposed near the temperature control drum 21 is rapidly dried, and the dissolution into the fine pores H of the film F is increased. The solvent MC of the plasticizer LP evaporates. That is, by blowing the dry air DA from the downstream air nozzles 22 arranged in the vicinity of the temperature control roll 21, the surface of the film F that is rapidly dried by the downstream air nozzles 22 arranged in the vicinity of the sealing roll 41 The part near the face on the opposite side dries quickly. Therefore, the plasticizer LP dissolved in the solvent MC is also dissolved from the fine pores H of the film F in the vicinity of the surface of the film F where the dry air DA is blown from the downstream air nozzle 22 arranged in the vicinity of the temperature control drum 21 . It is removed together with the solvent MC, and fine pores H are formed in the film F over the entire thickness direction (see FIGS. 2 and S4 ).

As described above, the dry air DA blown on the film F from the downstream air nozzle 22 in the vicinity of the sealing roll 41 of the intermediate roll sealing device 40 or the temperature control roll 21 disposed in the downstream drying chamber 20 is blown onto the film F. It is gas supplied from the downstream side blower 27 . That is, the gas suction side of the downstream side blower 27 communicates with the atmosphere outside the downstream side drying chamber 20, and when the downstream side blower 27 operates, the gas outside the downstream side drying chamber 20 is sucked, and the sucked gas is It is supplied to the downstream air nozzle 22 . Thereby, the dry air DA sucked from the outside of the downstream drying chamber 20 by the downstream air nozzle 22 is directed to the sealing drum 41 of the intermediate drum sealing device 40 or the temperature regulating drum 21 arranged in the downstream drying chamber 20 . The conveyed film F is blown.

In addition, by operating the downstream side blower 27, when the gas outside the downstream side drying chamber 20 is supplied to the downstream side air nozzles 22, the downstream side blower 27 performs temperature adjustment of the gas by the heating device or the cooling device included in the downstream side blower 27. , and supply the tempered gas as dry air DA. By blowing the temperature-controlled dry air DA toward the film F from the downstream air nozzle 22, the gas of the solvent MC adhering to the surface of the film F, the solvent MC existing in the interior of the film F, and the plasticizer LP is promoted The solvent MC and the plasticizer LP are efficiently removed.

The temperature of the gas is adjusted by the downstream side blower 27, and the downstream side blower 27 is controlled by the control device 50 to operate the heating device or the cooling device provided in the downstream side blower 27, so that the temperature of the gas becomes a preset setting temperature. The set temperature in this case is preferably set within a range from normal temperature to a temperature around the boiling point of the solvent MC. The set temperature when the temperature of the gas is adjusted by the downstream blower 27 is determined at the time of the test operation of the extraction and drying apparatus 1 to be effective for the solvent MC in which the plasticizer LP is dissolved, which will enter the fine pores H of the membrane F. The optimal temperature is removed, and the optimal temperature is set as the set temperature.

Among the plurality of temperature regulation rolls 21 arranged in the downstream drying chamber 20, the position of the temperature regulation roll 21 located on the most upstream side in the conveying direction of the film F is blown dry by the downstream air nozzle 22. The film F of the air DA is sequentially conveyed to the downstream side in the conveyance direction by the rotation of the temperature control drum 21 . Therefore, the film F is transported to the downstream side in the transport direction from the sealing roll 41 of the intermediate roll sealing device 40 while sequentially contacting the plurality of temperature regulating rolls 21 arranged in the downstream drying chamber 20 . At this time, these sealing rolls 41 and the temperature adjustment rolls 21 are brought into contact with the film F in a state in which the temperature of the warm water flowing into the inside is adjusted. Thereby, the temperature of the film F conveyed by the sealing roll 41 and the temperature regulating roll 21 also rises, so that the solvent MC and the plasticizer LP existing in the film F are easily vaporized, and the solvent MC and the plasticizer LP are easily vaporized. be removed more efficiently.

In addition, in the downstream drying chamber 20 where the downstream air nozzles 22 for blowing the dry air DA supplied from the outside of the downstream drying chamber 20 into the downstream drying chamber 20 are arranged, an exhaust duct 23 is provided, and an exhaust duct 23 is provided. The duct 23 exhausts the gas in the downstream drying chamber 20 . An exhaust blower 24 is connected to the exhaust duct 23, and a damper 25 is arranged. Therefore, the air in the downstream drying chamber 20 exhausted from the exhaust duct 23 is evacuated by the exhaust blower 24 while adjusting the flow rate with the damper 25. Suction and exhaust to the outside of the downstream drying chamber 20 . The pressure of the gas atmosphere in the downstream drying chamber 20 is adjusted to the atmospheric pressure around the downstream drying chamber 20 by exhausting the gas in the downstream drying chamber 20 from the exhaust duct 23 while adjusting the flow rate with the damper 25 . negative pressure. The adjustment of the pressure of the downstream drying chamber 20 is performed by the control device 50 .

The control device 50 obtains the detected value of the pressure of the gas environment in the downstream drying chamber 20 obtained by the indoor sensor 51 and the detected value of the pressure of the gas environment outside the downstream drying chamber 20 obtained by the outdoor sensor 52, and combines the two. Based on the comparison of the detected values, the damper 25 is actuated and the opening degree of the damper 25 is adjusted. At this time, the control device 50 adjusts the pressure of the downstream drying chamber 20 so that the pressure of the gas atmosphere in the downstream drying chamber 20 becomes a negative pressure within a predetermined range with respect to the atmospheric pressure around the downstream drying chamber 20 .

For example, when the detected value of the pressure of the gas environment in the downstream drying chamber 20 obtained by the indoor sensor 51 of the control device 50 is larger than the detected value of the pressure of the gas environment outside the downstream drying chamber 20 obtained by the outdoor sensor 52 When the pressure of the gas environment in the downstream drying chamber 20 is higher than the atmospheric pressure, the opening degree of the damper 25 is increased. As a result, the flow rate of the gas in the downstream drying chamber 20 sucked by the exhaust blower 24 is increased, and more gas is exhausted from the exhaust duct 23, so that the gas atmosphere in the downstream drying chamber 20 is reduced. Pressure drops. When the pressure of the gas atmosphere in the downstream drying chamber 20 is higher than the atmospheric pressure, by increasing the opening degree of the damper 25 in this way, the pressure of the gas atmosphere in the downstream drying chamber 20 is lowered, and the downstream drying chamber 20 is reduced. The pressure of the gas atmosphere inside becomes a negative pressure with respect to the atmospheric pressure around the downstream drying chamber 20 .

In addition, when the detected value of the pressure of the gas environment in the downstream drying chamber 20 obtained by the indoor sensor 51 of the control device 50 is smaller than the detected value of the pressure of the gas environment outside the downstream drying chamber 20 obtained by the outdoor sensor 52 When the pressure of the gas environment in the downstream drying chamber 20 is lower than the atmospheric pressure, the opening degree of the damper 25 is reduced. Thereby, the flow rate of the gas in the downstream drying chamber 20 sucked by the exhaust blower 24 is reduced, and the gas exhausted from the exhaust duct 23 is reduced, thereby suppressing the change of the gas environment in the downstream drying chamber 20 . drop in pressure.

That is, in the downstream drying chamber 20, the gas supplied from the outside of the downstream drying chamber 20 by the downstream blower 27 is continuously blown out through the downstream air nozzles 22, so that the gas exhausted from the exhaust duct 23 is reduced. Thereby, the pressure drop of the gas atmosphere in the downstream side drying chamber 20 can be suppressed. When the pressure of the gas atmosphere in the downstream drying chamber 20 is lower than atmospheric pressure, by reducing the opening degree of the damper 25 in this way, the decrease in the pressure of the gas atmosphere in the downstream drying chamber 20 is suppressed, so that the downstream drying chamber 20 The pressure of the gas atmosphere inside does not become too low with respect to the atmospheric pressure around the downstream drying chamber 20 .

In this way, the control device 50 obtains the detection value of the indoor sensor 51 and the detection value of the outdoor sensor 52, compares the detection values of the two, and adjusts the opening degree of the damper 25 based on the comparison result, thereby adjusting the gas environment in the downstream drying chamber 20. pressure. As a result, the pressure of the gas atmosphere in the downstream drying chamber 20 is reduced within a range of a preset value relative to the atmospheric pressure around the downstream drying chamber 20, that is, the pressure in the downstream drying chamber 20 is reduced. The pressure of the gas atmosphere becomes a negative pressure within a predetermined range with respect to the atmospheric pressure around the downstream drying chamber 20 . In addition, the pressure of the gas atmosphere in the downstream drying chamber 20 becomes a negative pressure with respect to the atmospheric pressure in this way, and becomes lower than the pressure of the gas atmosphere in the upstream drying chamber 10, and the pressure of the gas atmosphere in the upstream drying chamber 10 becomes lower than that of the gas atmosphere in the upstream drying chamber 10. The pressure also becomes negative pressure.

Since the pressure of the gas atmosphere in the downstream drying chamber 20 is exhausted from the exhaust duct 23 in this way, the pressure of the gas atmosphere in the downstream drying chamber 20 becomes a negative pressure with respect to the atmospheric pressure, and the pressure of the gas atmosphere in the downstream drying chamber 20 is lowered, so it exists inside the film F. The solvent MC or plasticizer LP is easily vaporized. Thereby, the film F conveyed in the downstream drying chamber 20 is dried while being conveyed in the downstream drying chamber 20 without the plasticizer LP remaining on the film F.

The film F conveyed in the downstream drying chamber 20 is conveyed toward the opening 26 formed in the downstream drying chamber 20 . Since the outlet-side roll seal device 45 is disposed in the opening 26 of the downstream-side drying chamber 20 , it is transported to the outside of the downstream-side drying chamber 20 via the outlet-side roll seal device 45 . Here, since the outlet-side spool seal 45 is arranged in the opening 26 of the downstream-side drying chamber 20 in this way, the gas atmosphere of the downstream-side drying chamber 20 and the atmosphere outside the downstream-side drying chamber 20 are blocked by the outlet-side spool seal 45 . separated. Therefore, the movement of gas between the inside and the outside of the downstream drying chamber 20 becomes difficult, and the gas environment in the downstream drying chamber 20 is maintained at a negative pressure with respect to atmospheric pressure by the outlet spool seal 45 .

Specifically, the outlet-side roll sealing device 45 includes a sealing roll 46 that conveys the film F, and a sealing member 47 that is close to the sealing roll 46 and has a labyrinth structure; it is dried from the downstream drying chamber 20 to the downstream side. The film F conveyed outside the chamber 20 is conveyed through between the seal roll 46 and the seal member 47 . That is, on the surface side opposite to the surface in contact with the seal roll 46 of the film F, which is conveyed from the downstream side drying chamber 20 to the outside of the downstream side drying chamber 20 while being in contact with the seal roll 46 , the The gap of the film F is extremely small and has the sealing member 47 of the labyrinth configuration. As a result, when the film F is sent out from the downstream drying chamber 20 to the outside of the downstream drying chamber 20, the air outside the downstream drying chamber 20 whose pressure is higher than the gas atmosphere in the downstream drying chamber 20 is sealed by the outlet roll. The sealing member 47 included in the device 45 is blocked, and it is difficult to enter the downstream drying chamber 20 .

In addition, since the downstream drying chamber 20 has a negative pressure with respect to the atmospheric pressure around the downstream drying chamber 20, the gas in the downstream drying chamber 20 cannot easily pass through the sealing member 47 and the film F of the outlet roll sealing device 45. The gap or the gap between the seal roll 46 and the seal member 47 flows out of the downstream drying chamber 20 . Therefore, the vaporized gas of the solvent MC or the plasticizer LP is less likely to leak from the inside of the downstream drying chamber 20 to the outside of the downstream drying chamber 20 .

The liquid plasticizer is extracted with the solvent by the extraction device 2 , the solvent is dried by the drying device 5 , and the film F sent out of the downstream drying chamber 20 through the outlet-side roll sealing device 45 is sent downstream of the extraction and drying device 1 . side process transport.

<Effect of Embodiment>

In the extraction drying apparatus 1 of the above-described embodiment, the drying chamber 6 of the drying apparatus 5 includes the upstream drying chamber 10 and the downstream drying chamber 20 which are partitioned by the partition wall 30 . Among them, the upstream drying chamber 10 communicates with the storage tank 3 storing the solvent MC, and the downstream drying chamber 20 is provided with a downstream side for blowing the temperature-controlled gas to the film F conveyed in the downstream drying chamber 20 Air nozzles 22 . Thereby, in the upstream drying chamber 10 , the solvent MC adhering to the film F can be removed in a liquid state, and after removing the solvent MC without drying the film F, the film F can be removed in the downstream drying chamber 20 . dry. Therefore, it can suppress that the liquid plasticizer dissolved in the solvent MC does not vaporize and remains on the film F because the film F from which the liquid plasticizer is extracted from the solvent MC is rapidly dried.

Here, the step of drying the film F by the conventional extraction and drying apparatus 101 will be described. FIG. 3 is a schematic diagram showing an example of a conventional extraction and drying apparatus 101 . FIG. 4 is an explanatory diagram showing a process of drying the film F by the extraction and drying apparatus 101 shown in FIG. 3 . The conventional extraction and drying apparatus 101 has an extraction apparatus 102 and a drying apparatus 105, for example, as shown in FIG. Further, the drying device 105 has one drying chamber 106, and the drying chamber 106 is provided with a liquid removal drum 111, a temperature adjustment drum 112, an air nozzle 113, and an exhaust duct 114. The liquid removing reel 111 is formed of a reel having a diameter smaller than that of the temperature regulating reel 112, and a plurality of them are arranged above the storage tank 103. The temperature adjusting reel 112 is on the downstream side of the liquid removing reel 111 in the conveying direction of the film F. There are multiple configurations. The air nozzle 113 is arranged near the temperature adjustment reel 112 , and can spray the air outside the drying chamber 106 to the film F conveyed by the temperature adjustment reel 112 , and the exhaust duct 114 sends the air in the drying chamber 106 to the outside of the drying chamber 106 . exhaust.

In addition, the conventional extraction and drying apparatus 101 has a water sealing structure 120 as shown in FIG. 3 as a sealing structure for a portion where the film F dried in the drying chamber 106 is sent out from the drying chamber 106 to the outside of the drying chamber 106 . The water seal structure 120 includes a seal water tank 121 for storing water W, a water seal reel 122 for conveying the film F in the water seal structure 120 , and a water seal air nozzle 123 for blowing gas to the film F conveyed by the water seal reel 122 . .

In the water-tight structure 120 shown in FIG. 3 , the portion of the drying chamber 106 that communicates with the sealed water tank 121 does not directly communicate with the atmosphere outside the drying chamber 106 in a state where the water W is stored in the sealed water tank 121 , and the drying chamber 106 The water W stored in the sealed water tank 121 is interposed between the inner gas environment and the outer gas environment, and is sealed by the water W. The film F passing through the water sealing structure 120 is sent out from the drying chamber 106 to the outside of the drying chamber 106 by passing through the water W stored in the sealing water tank 121 for sealing, and the film F passing through the water W is removed from the water by the water W. The sealing air nozzle 123 blows gas, and the adhering water W is blown away.

In the conventional extraction and drying apparatus 101 having such a configuration, in order to remove the solvent MC adhering to the film F from the film F, the film F conveyed from the extraction apparatus 102 to the drying apparatus 105 is conveyed from the storage tank 103 to the drying apparatus 105 The drying chamber 106. The film F transported from the storage tank 103 to the drying chamber 106 is first transported to the liquid removal roll 111 in a state where a large amount of the solvent MC adheres to the surface (see FIG. 4 , S11 ).

In the liquid removal drum 111, the solvent MC adhering to the surface of the film F is removed to some extent. Next, the film F that has passed through the liquid removal roll 111 is conveyed to a position where the temperature adjustment roll 112 located on the downstream side of the liquid removal roll 111 in the conveyance direction of the film F is arranged. The air nozzle 113 is arrange|positioned in the vicinity of the temperature control roll 112, and the air nozzle 113 blows the dry air DA which is a drying gas supplied from the outside of the drying chamber 106 with respect to the film F conveyed by the temperature control roll 112. Thereby, the film F to which the dry air DA was sprayed from the air nozzle 113, the solvent MC on the surface to which the dry air DA was sprayed was blown away by the dry air DA, and the film F was sprayed dry from the air nozzle 113. The solvent MC on the surface of the air DA is removed (see FIG. 4 , S12 ).

In addition, the temperature of the temperature control roll 112 is adjusted to raise the temperature of the film F so that the solvent MC containing the plasticizer LP that has entered the fine pores H of the film F can be vaporized. As a result, the solvent MC entering the fine pores H of the membrane F is vaporized, but the solvent MC adhering to the membrane F is largely in a state of being easily dried by being blown with the dry air DA. The plasticizer LP dissolved in the solvent MC may remain as a residual plasticizer RLP in a part of the solvent MC in the solvent MC in the fine pores H. That is, since the solvent MC is vaporized in a state where a large amount of the solvent MC adheres to the membrane F and the solvent MC is easily vaporized, a part of the solvent MC that has entered the fine pores H of the membrane F will be dissolved in the solvent MC. The plasticizer LP remains in the micropores H as it is, and only the solvent MC is vaporized, and the residual plasticizer RLP is likely to remain in the micropores H.

The film F with the residual plasticizer RLP remaining on the fine pores H or the surface is conveyed by the plurality of temperature control rolls 112 while the plurality of temperature control rolls 112 are in contact with both surfaces of the film F alternately, and adheres to the film The temperature of the film F is raised by the temperature control roll 112, and the solvent MC on the surface of F is vaporized and removed (see FIG. 4, S13).

Furthermore, when the solvent MC adhering to the surface of the film F is blown off by the dry air DA blown from the air nozzles 113 arranged in the vicinity of the temperature control drum 112, a part of the solvent MC that has been blown off It floats in the drying chamber 106 as droplets, and may adhere to the surface of the film F from which the solvent MC has been removed. In this case, in the solvent MC adhering to the film F, only the solvent MC is vaporized while the plasticizer LP dissolved in the solvent MC remains as it is, and residual plasticization remains on the surface of the film F. In the case of agent RLP.

The film F from which the solvent MC has been removed is sent to the outside of the drying chamber 106 through the water sealing structure 120 , and is sent to the process subsequent to the extraction and drying apparatus 101 . Therefore, the film F in the state where the residual plasticizer RLP remains is conveyed from the extraction and drying apparatus 101 to the subsequent process.

FIG. 5 is an explanatory diagram of the oil stain M. FIG. The residual plasticizer RLP remaining on the surface of a part of the fine pores H of the film F or the film F appears on the film F as oil stains M as a continuous pattern of band-like wavy or a plurality of transparent dot-like patterns. The oil stains M have poor appearance and are detected as defects in the inspection apparatus for inspecting the produced film F. However, in the conventional extraction and drying apparatus 101 as shown in FIG. 3 , extraction of the liquid plasticizer is performed. , Oil stains M easily occur on the film F during drying.

On the other hand, in the extraction and drying apparatus 1 according to the present embodiment, the upstream drying chamber 10 communicated with the storage tank 3 is separated from the downstream drying chamber 20 by the partition wall 30, and the gas atmosphere in the upstream drying chamber 10 is filled with gas. The gas environment of the solvent gas MCG rich in the solvent gas MCG as the solvent MC. Therefore, the solvent MC adhering to the film F after extraction of the liquid plasticizer with the solvent MC is used as the liquid removing drum 12 or the upstream side air nozzle 13 of the liquid removing device 11 in the upstream side drying chamber 10 During removal, the solvent MC attached to the film F transported in the gas atmosphere filled with the solvent gas MCG is difficult to vaporize.

In addition, since the inside of the upstream drying chamber 10 becomes a gas atmosphere rich in the solvent gas MCG, even if the spray of the solvent MC blown off from the film F in the upstream drying chamber 10 adheres to the film F, it adheres to the film F. The solvent MC is also difficult to vaporize, and the droplets of the solvent MC are difficult to dry.

In the upstream drying chamber 10, by removing the solvent MC adhering to the film F in the gas atmosphere filled with the solvent gas MCG in this way, the solvent MC adhering to the film F is reduced while the vaporization of the solvent MC is suppressed, and the solvent MC adhering to the film F is reduced. The film F in which the adhered solvent MC is reduced is transported from the upstream drying chamber 10 to the downstream drying chamber 20 . In other words, in the upstream drying chamber 10 , by removing the solvent MC adhering to the film F as a liquid, the amount of the adhering solvent MC can be reduced, and it is possible to prevent the solvent MC adhering to the film F from adhering to the film F Dry as is.

In the downstream drying chamber 20 , the dry air DA whose temperature has been adjusted is blown through the downstream air nozzle 22 to the film F in which the adhering solvent MC is reduced. As a result, the film F also includes the solvent MC that has entered the fine pores H, and the amount of the solvent MC that adheres to a small amount is blown away by the dry air DA blown from the downstream side air nozzle 22 , so it is dissolved in the solvent MC. The plasticizer LP in the film does not remain on the film F, and the solvent MC is blown away. In addition, the dry air DA blown to the film F from the downstream air nozzle 22 becomes the gas whose temperature is adjusted by the downstream blower 27 , that is, the downstream air nozzle 22 blows warm air to the film F. Therefore, the temperature of the small amount of solvent MC adhering to the film F is increased by the warm air blown from the downstream side air nozzle 22 , and is thereby promoted to be vaporized and removed from the film F.

In the extraction drying apparatus 1 according to the present embodiment, the solvent MC adhering to the membrane F is reduced in a liquid state in the gas atmosphere rich in the solvent gas MCG in the upstream drying chamber 10 in this way, and is dried on the downstream side. In the chamber 20, the solvent MC adhering to the film F is removed in a dry gas atmosphere, and the solvent MC can be appropriately removed. Therefore, the plasticizer LP dissolved in the solvent MC does not remain on the film F as the residual plasticizer RLP, the solvent MC can be appropriately removed including the plasticizer LP dissolved in the solvent MC, and residual plasticization can be suppressed Agent RLP remains on film F as oil trace M. As a result, the occurrence of oil stains M can be suppressed.

In addition, in the conventional extraction and drying apparatus 101 as shown in FIG. 3, since the solvent MC adhering to the membrane F is removed by the liquid removal drum 111 in a gas atmosphere in which the solvent MC is easily vaporized, there is a possibility that the Before drying the film F by blowing dry air DA from the air nozzle 113, the film F is partially dried. In this case, there is a possibility that the film F is partially shrunk due to partial drying to cause slack, wrinkles, or waves, or unevenness in physical properties such as shrinkage rate.

On the other hand, in the extraction and drying apparatus 1 according to the present embodiment, in order to remove the solvent MC adhering to the film F by the liquid removal drum 12 in the upstream drying chamber 10 in a gas atmosphere filled with the solvent gas MCG, it is possible to suppress the The film F is dried while being conveyed in the upstream drying chamber 10 . Thereby, partial drying of the film F can be suppressed, and the occurrence of slack, wrinkle, or waviness caused by the partial drying of the film F, or occurrence of unevenness in physical properties such as shrinkage rate can be suppressed. As a result, a high-quality film F can be obtained.

In addition, as another method for suppressing the occurrence of oil stains M on the film F, it is conceivable to increase the capacity of the storage tank 3 and increase the amount of the solvent MC stored in the storage tank 3 to plasticize the solvent MC dissolved in the solvent MC. A method of reducing the concentration of the agent LP. However, when the capacity of the storage tank 3 is increased and the amount of the solvent MC stored in the storage tank 3 is increased, the size of the extraction and drying apparatus 1 as a whole increases due to the enlargement of the storage tank 3. Therefore, the extraction and drying apparatus 1 The cost of MC increases, or the operating cost increases with the use of more solvent MC.

On the other hand, in the extraction and drying apparatus 1 according to the present embodiment, since the occurrence of the oil stains M on the membrane F can be suppressed without increasing the amount of the solvent MC used, it is possible to suppress the oil stains M without increasing the capacity of the storage tank 3 . occur. As a result, it is possible to suppress increases in equipment costs and running costs.

In addition, as another method for suppressing the occurrence of oil stains M on the film F, it is conceivable to make the plasticizer LP dissolved in the solvent MC adhered to the film F after the liquid plasticizer is extracted from the solvent MC. When the concentration becomes low, the forming speed of the film F is reduced, and the immersion time of the film F in the solvent MC is prolonged. However, when the molding speed of the film F is lowered, the entire production time required for the production of the film F tends to be long.

On the other hand, in the extraction and drying apparatus 1 according to the present embodiment, the plasticizer LP dissolved in the solvent MC adhering to the film F is removed together with the solvent MC without increasing the immersion time of the film F in the solvent MC. It can suppress that the time required for manufacture of the film F becomes long. As a result, the generation of the oil stains M on the film F can be suppressed while the production time of the film F becomes longer.

In addition, since the downstream drying chamber 20 is adjusted to a negative pressure with respect to the atmospheric pressure around the downstream drying chamber 20 , in the downstream drying chamber 20 , the entry of the solvent into the fine pores H of the membrane F can be promoted more reliably Vaporization of MC and the solvent MC adhering to the surface of the membrane F. Thereby, in the downstream drying chamber 20, the plasticizer LP dissolved in the solvent MC can also be removed more reliably together with the solvent MC, and the residual plasticizer RLP can be suppressed from remaining on the film F. As a result, the occurrence of oil stains M can be suppressed more reliably.

In addition, since the intermediate roll sealing device 40 including the sealing roll 41 and the sealing member 42 is disposed at the communication portion 31 of the partition wall 30, the upstream drying chamber 10 can be maintained in a gas atmosphere filled with the solvent gas MCG At the same time, the film F is transported from the upstream drying chamber 10 to the downstream drying chamber 20 . Thereby, in the upstream drying chamber 10, the solvent MC adhering to the film F can be removed more reliably in the liquid state, and the solvent MC adhering to the film F can be more reliably suppressed from adhering to the film F dry in its original state. Therefore, the residual plasticizer RLP can be more reliably suppressed from remaining on the film F due to the solvent MC adhering to the film F being dried as it is adhering to the film F. As a result, the occurrence of oil stains M can be suppressed more reliably.

Moreover, since the liquid removal roll 12 which conveys the film F while applying pressure to the film F is used as the liquid removal device 11 for removing the solvent MC adhering to the film F conveyed in the upstream drying chamber 10, it is possible to The solvent MC adhering to the film F is removed while conveying the film F by the liquid removal roll 12 . Accordingly, the structure for removing the solvent MC adhering to the film F can be simplified, and an increase in the number of parts when the liquid removing device 11 is arranged in the upstream drying chamber 10 can be suppressed. As a result, the occurrence of oil stains M can be suppressed while suppressing an increase in the manufacturing cost of the extraction drying apparatus 1 .

Further, as the liquid removing device 11 for removing the solvent MC adhering to the film F conveyed in the upstream drying chamber 10, the upstream air for blowing the gas supplied from the upstream drying chamber 10 to the film F is used Since the nozzle 13 is used, the film F can be sprayed with gas while maintaining the gas atmosphere in the upstream drying chamber 10 filled with the solvent gas MCG. Thereby, the vaporization of the solvent MC adhering to the membrane F in the upstream drying chamber 10 can be suppressed more reliably, and the solvent MC adhering to the membrane F can be removed more reliably as a liquid. Therefore, it is possible to more reliably prevent the solvent MC adhering to the film F from drying as it is adhering to the film F, and it is possible to more reliably suppress the residual plasticizer RLP due to drying of the solvent MC adhering to the film F as it is remained on the film F. As a result, the occurrence of oil stains M can be suppressed more reliably.

Moreover, since the temperature control roll 16 which can convey the film F by making the temperature of the contact surface 16a with the film F to be equal to or higher than the boiling point of the solvent MC is arranged in the upstream drying chamber 10, the temperature control roll 16 is used in the upstream drying chamber 10. 16 When the membrane F is transported, the solvent MC that has entered the fine pores H of the membrane F can be bumped. Thereby, since the solvent MC that has entered the fine pores H can be released to the outside of the film F together with the plasticizer LP dissolved in the solvent MC, the plasticizer L can be more reliably prevented from remaining as the residual plasticizer RLP. in the micropore H. As a result, the occurrence of oil stains M can be suppressed more reliably.

In addition, since the exhaust duct 23 arranged in the downstream drying chamber 20 is arranged on the bottom surface of the downstream drying chamber 20 , it is possible to suppress the solvent MC blown away by the downstream air nozzle 22 in the downstream drying chamber 20 from flying away. The foam adhered to the membrane F. That is, the droplets of the solvent MC blown away by the downstream air nozzles 22 fall downward by gravity, but the exhaust duct 23 is arranged on the bottom surface of the downstream drying chamber 20 , and is discharged from the lower side of the downstream drying chamber 20 . Since the gas in the downstream drying chamber 20 is exhausted, the droplets of the solvent MC falling toward the lower side can be efficiently discharged to the outside of the downstream drying chamber 20 . Thereby, it can suppress more reliably that the spray which passed the solvent MC floats in the downstream drying chamber 20, and adheres to the film F easily. Therefore, the residual plasticizer RLP can be suppressed from remaining on the surface of the film F because the droplets of the solvent MC adhere to the film F more reliably. As a result, the occurrence of oil stains M can be suppressed more reliably.

[Variation]

In the above-described embodiment, the storage tank 3 of the extraction device 2 stores the solvent MC for extracting the liquid plasticizer impregnated in the film F, but the liquid stored in the storage tank 3 may be a solvent Outside of MC. The extraction device 2 may include, for example, a storage tank for storing the solvent MC and a storage tank 3 for storing water from which the solvent MC is removed from the membrane F; On the upstream side in the conveying direction, the upstream drying chamber 10 communicates with the storage tank 3 storing water. That is, the membrane F that has passed through the water stored in the storage tank 3 may be sent to the upstream drying chamber 10 .

Even when the film F that has passed through the solvent MC is removed with the water stored in the storage tank 3 , the liquid plasticizer impregnated in the film F may remain slightly on the film F sent to the upstream drying chamber 10 . situation of the agent. Therefore, even in such a case, by making the upstream drying chamber 10 communicate with the storage tank 3, the gas atmosphere in the upstream drying chamber 10 can be filled with the vapor of the water stored in the storage tank 3. In the upstream drying chamber 10, the water adhering to the membrane F can be removed as a liquid and reduced. Thereby, it is possible to prevent the water adhering to the film F from drying as it is adhering to the film F, to suppress the plasticizer LP slightly remaining on the film F from continuing to remain as the residual plasticizer RLP, and to suppress the generation of oil Trace M.

In addition, the liquid removal rolls 12, the upstream air nozzles 13, and the temperature adjustment rolls 16 arranged in the upstream drying chamber 10 may be arranged in a different number or arrangement form from those in the above-described embodiment. Likewise, the temperature control drums 21 or the downstream air nozzles 22 arranged in the downstream drying chamber 20 may be arranged in a different number or arrangement form from those in the above-described embodiment.

Label description

1...extraction drying device; 2...extraction device; 3...storage tank; 4...storage tank reel; 5...drying device; 6...drying chamber; 10...upstream drying chamber; 13...upstream air nozzles; 14...circulating exhaust ducts; 16...tempering drums; 16a...contact surfaces; 17...upstream blowers; 18...air supply paths; 20...downstream drying chambers; 22...downstream air nozzle; 23...exhaust duct; 24...exhaust blower; 25... damper; 26...opening part; 27...downstream blower; 28...air supply path; 31...connecting portion; 40...intermediate reel seal; 41...seal reel; 42...seal member; 45...outlet side reel seal; 46...seal reel; 47...seal member; 50...control device; 51 ...indoor sensor; 52...outdoor sensor; 101...extraction drying device; F...membrane; MC...solvent; H...micropore; LP...plasticizer; RLP...residual plasticizer; WA...wet air; DA...dry air ; M... oil stains.

Claims (as amended by Article 19 of the Treaty)

1. (after correction) a kind of extraction drying device, it is characterized in that,

have:

Storage tank, which stores the liquid through which the membrane passes;

an upstream drying chamber, communicated with the storage tank, and conveys the membrane through the liquid stored in the storage tank;

A liquid removing device is disposed in the upstream drying chamber, and removes the liquid adhering to the film transported in the upstream drying chamber;

a temperature-adjusting drum that is disposed in the upstream drying chamber, and transports the film so that the temperature of the contact surface with the film becomes a temperature equal to or higher than the boiling point of the liquid;

The downstream drying chamber is arranged on the downstream side of the upstream drying chamber in the conveying direction of the film;

a partition wall partitioning the upstream drying chamber and the downstream drying chamber, and having a communication portion through which the film conveyed from the upstream drying chamber toward the downstream drying chamber passes; and

A downstream side air nozzle is arrange|positioned in the said downstream side drying chamber, and blows the temperature-regulated gas to the said film conveyed in the said downstream side drying chamber.

2. The extraction and drying device according to claim 1, characterized in that,

The said downstream side drying chamber is adjusted to a negative pressure with respect to the atmospheric pressure around the said downstream side drying chamber.

3. The extraction and drying device according to claim 1 or 2, characterized in that,

A reel sealing device is arranged in the communication portion, and the reel sealing device includes:

sealing the roll and conveying the film from the upstream drying chamber side to the downstream drying chamber side; and

The sealing member faces a surface on the opposite side of the surface of the film conveyed by the sealing roll, which faces the side of the sealing roll.

4. The extraction and drying apparatus according to any one of claims 1 to 3, characterized in that:

The said liquid removal apparatus is equipped with the liquid removal drum which conveys the said film|membrane while applying a pressure to the said film|membrane.

5. The extraction and drying apparatus according to any one of claims 1 to 4, characterized in that:

The said liquid removal apparatus is equipped with the upstream side air nozzle which blows the gas supplied from the said upstream side drying chamber to the said film|membrane.

6. (deleted)

Claims (6)

1. An extraction drying device, characterized in that, have: Storage tank, which stores the liquid through which the membrane passes; an upstream drying chamber, communicated with the storage tank, and conveys the membrane through the liquid stored in the storage tank; A liquid removing device is disposed in the upstream drying chamber, and removes the liquid adhering to the film transported in the upstream drying chamber; The downstream drying chamber is arranged on the downstream side of the upstream drying chamber in the conveying direction of the film; a partition wall partitioning the upstream drying chamber and the downstream drying chamber, and having a communication portion through which the film conveyed from the upstream drying chamber toward the downstream drying chamber passes; and A downstream side air nozzle is arrange|positioned in the said downstream side drying chamber, and blows the temperature-regulated gas to the said film conveyed in the said downstream side drying chamber. 2. The extraction and drying device according to claim 1, characterized in that, The said downstream side drying chamber is adjusted to a negative pressure with respect to the atmospheric pressure around the said downstream side drying chamber. 3. The extraction and drying device according to claim 1 or 2, characterized in that, A reel sealing device is arranged in the communication portion, and the reel sealing device includes: sealing the roll and conveying the film from the upstream drying chamber side to the downstream drying chamber side; and The sealing member faces a surface on the opposite side of the surface of the film conveyed by the sealing roll, which faces the side of the sealing roll. 4. The extraction and drying apparatus according to any one of claims 1 to 3, characterized in that: The said liquid removal apparatus is equipped with the liquid removal drum which conveys the said film|membrane while applying a pressure to the said film|membrane. 5. The extraction and drying apparatus according to any one of claims 1 to 4, characterized in that: The said liquid removal apparatus is equipped with the upstream side air nozzle which blows the gas supplied from the said upstream side drying chamber to the said film|membrane. 6. The extraction and drying apparatus according to any one of claims 1 to 5, characterized in that: In the said upstream drying chamber, the temperature control roll which can make the temperature of the contact surface with the said film become the boiling point of the said liquid or more and can convey the said film is arrange|positioned.

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