CN115038922A

CN115038922A - Extraction drying device

Info

Publication number: CN115038922A
Application number: CN202180011797.3A
Authority: CN
Inventors: 结城拓哉; 佐野孝义; 田村正嗣; 芹泽光明; 水上雄太
Original assignee: Zhipu Machinery Co ltd
Current assignee: Zhipu Machinery Co ltd
Priority date: 2020-11-11
Filing date: 2021-10-27
Publication date: 2022-09-09
Anticipated expiration: 2041-10-27
Also published as: CN115038922B; WO2022102406A1; JP7072623B1; JP2022080319A; KR20220115827A; DE112021000379T5

Abstract

In order to suppress the occurrence of oil stain, an extraction drying device (1) is provided with: a storage tank (3) that stores a solvent (MC) as a liquid through which the film (F) passes; an upstream side drying chamber (10) which communicates with the reservoir tank (3) and which transports the film (F) that has passed through the solvent (MC) stored in the reservoir tank (3); a liquid removal device (11) which is disposed in the upstream drying chamber (10) and which removes the solvent (MC) adhering to the film (F) conveyed in the upstream drying chamber (10); a downstream drying chamber (20) disposed downstream of the upstream drying chamber (10) in the transport direction of the film (F); a partition wall (30) that partitions the upstream drying chamber (10) and the downstream drying chamber (20), and that has a communication section (31) through which the film (F) that is conveyed from the upstream drying chamber (10) toward the downstream drying chamber (20) passes; and a downstream air nozzle (22) that is disposed in the downstream drying chamber (20) and that blows a temperature-adjusted gas onto the film (F) that is conveyed in the downstream drying chamber (20).

Description

Extraction drying device

Technical Field

The present invention relates to an extraction drying device.

Background

As a method for producing a porous film such as a separator used in a lithium ion battery, a method using a plasticizer is known. For example, patent document 1 and patent document 2 describe the following methods: the porous film is produced by mixing a resin composition with a plasticizer, melting and kneading the mixture at a high temperature to form a sheet, drawing the sheet by a drawing machine, extracting the plasticizer with a solvent by an extraction and drying device, and drying the solvent.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2005-239773

Patent document 2: japanese patent laid-open publication No. 2011-42805

Disclosure of Invention

Problems to be solved by the invention

However, if the plasticizer adhering to the film is extracted with a solvent in an extraction step section of the extraction and drying apparatus and then dried in a drying step section, depending on the operating conditions, oil stains may occur on the film surface as a continuous pattern in the form of a band wave or as a pattern of a plurality of transparent dots. The oil stain is generated by the plasticizer dissolved in the solvent remaining on the film without vaporizing and locally remaining on the film when the solvent adhering to the film in the extraction process section is dried in the drying process section. The appearance of oil stains is poor, and defects are detected in an inspection apparatus for inspecting the manufactured porous film, so that there is room for improvement from the viewpoint of suppressing oil stains.

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

Means for solving the problems

In order to solve the above problems and achieve the object, an extraction and drying apparatus according to the present invention includes: a storage tank for storing the liquid through which the membrane passes; an upstream side drying chamber which communicates with the storage tank and through which the film in the liquid stored in the storage tank is transported; a liquid removing device disposed in the upstream drying chamber, for removing the liquid adhering to the film conveyed in the upstream drying chamber; a downstream side drying chamber disposed downstream of the upstream side drying chamber in a transport direction of the film; a partition wall that partitions the upstream drying chamber and the downstream drying chamber and has a communication portion through which the film conveyed from the upstream drying chamber to the downstream drying chamber passes; and a downstream air nozzle disposed in the downstream drying chamber and configured to blow a temperature-adjusted gas onto the film transported in the downstream drying chamber.

Effects of the invention

The extraction drying device according to the present invention has an effect of suppressing the generation of oil stain.

Drawings

Fig. 1 is a schematic diagram showing the device configuration of an extraction and drying device according to an embodiment.

Fig. 2 is an explanatory diagram illustrating a process of drying a film by the extraction and drying device 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 view showing a process of drying the film by the extraction drying device shown in fig. 3.

Fig. 5 is an explanatory diagram of the oil stain.

Detailed Description

Hereinafter, an embodiment of the extraction and drying device according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment. The components of the following embodiments include those that can be replaced and easily conceived by those skilled in the art, or those that are substantially the same.

[ embodiment ]

Fig. 1 is a schematic diagram showing the device configuration of an extraction and drying device 1 according to the embodiment. In the following description, the vertical direction of the extraction and drying device 1 in the normal use state is referred to as the vertical direction Z of the extraction and drying device 1, the upper side of the extraction and drying device 1 in the normal use state is referred to as the upper side of the extraction and drying device 1, and the lower side of the extraction and drying device 1 in the normal use state is referred to as the lower side of the extraction and drying device 1. The horizontal direction in the normal use state of the extraction and drying device 1 will be described as the horizontal direction in the extraction and drying device 1. Further, in the horizontal direction, the direction in which the film F conveyed by the extraction and drying device 1 advances is referred to as a longitudinal direction Y of the extraction and drying device 1, and a direction orthogonal to the longitudinal direction Y in the horizontal direction is referred to as a width direction X of the extraction and drying device 1.

< extraction drying apparatus 1>

The extraction and drying device 1 according to the present embodiment is mainly used for manufacturing a separator used in a lithium ion battery, and includes an extraction device 2 and a drying device 5. In the step upstream of the extraction and drying device 1 in the production of the separator, a resin material as a raw material of the separator and a liquid plasticizer as a liquid plasticizer are melted and kneaded and molded into a sheet shape to obtain a film F as a sheet-shaped film member, but the extraction and drying device 1 is a device for removing the liquid plasticizer from the obtained film F.

Specifically, as a resin material to be a raw material of the separator, for example, polyolefin resin such as polyethylene or polypropylene is used. Further, as the liquid plasticizer, for example, oil, flowing paraffin or the like is used. In the step upstream of the extraction drying apparatus 1 in the production of the separator, these resin materials and the liquid plasticizer are melted and mixed to form a sheet, and the sheet is drawn to form a film F in which a large number of fine holes are opened in the polyolefin-based resin and the liquid plasticizer enters the fine holes. The extraction drying device 1 is configured as a device for performing the following processes: the liquid plasticizer impregnated in the film F is extracted and removed from the film F thus formed, whereby the liquid plasticizer is released from the plurality of fine pores opened in the polyolefin-based resin, and the film F opened with the plurality of fine pores is obtained.

The extraction device 2 of the extraction and drying device 1 extracts the liquid plasticizer from the film F fed to the extraction and drying device 1 using the solvent MC. Therefore, the extraction device 2 has a storage tank 3 as a tank for the liquid solvent MC, and the solvent MC is stored in the storage tank 3. As the solvent MC, for example, dichloromethane is used. In the stock tank 3, a plurality of stock tank rolls 4 are arranged, and in the extraction device 2, the film F is wound around the stock tank roll 4 in the stock tank 3 and is transported while being immersed in the solvent MC in the stock tank 3, so that the liquid plasticizer is extracted and removed from the film F. The reservoir tank 3 is a tank for storing the liquid through which the film F passes.

The drying device 5 included in the extraction and drying device 1 is disposed downstream of the extraction device 2 in the transport 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 device 5 removes the solvent MC adhering to the film F from the film F by the extraction device 2 by drying the film F.

The drying device 5 includes a drying chamber 6 as a processing chamber for drying the film F, and includes an upstream side drying chamber 10 and a downstream side drying chamber 20 disposed downstream of the upstream side drying chamber 10 in the transport direction of the film F as the drying chamber 6. Between the upstream drying chamber 10 and the downstream drying chamber 20, a partition wall 30 is disposed to partition the upstream drying chamber 10 and the downstream drying chamber 20. In the present embodiment, the upstream drying chamber 10 and the downstream drying chamber 20 are disposed adjacent to each other in the horizontal direction with the partition wall 30 interposed therebetween. That is, upstream drying chamber 10 and downstream drying chamber 20 are formed by disposing partition wall 30 that divides the internal space of drying chamber 6 into two spaces inside 1 drying chamber 6, and adjacent to each other with partition wall 30 interposed therebetween. The film F transferred from the extraction device 2 to the drying device 5 is transferred in 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 stock tank 3, and thereby the drying chamber 6 communicates with the extraction device 2 via the stock tank 3. Specifically, the reservoir 3 is open upward, the upstream drying chamber 10 is disposed above the reservoir 3, and the lower surface is open toward the reservoir 3. In the state where the solvent MC is stored in the storage tank 3, the portion of the upstream drying chamber 10 that communicates with the storage tank 3 does not directly communicate with the gas atmosphere outside the upstream drying chamber 10, and the solvent MC stored in the storage tank 3 is interposed between the gas atmosphere inside the upstream drying chamber 10 and the gas atmosphere outside the upstream drying chamber. Thus, the upstream drying chamber 10 communicates with the reservoir tank 3 for storing the solvent MC, and the film F passing through the solvent MC stored in the reservoir 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 control drum 16 are disposed. The liquid removal drum 12 and the upstream air nozzle 13 are disposed 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 the dehumidifying drums 12 are disposed above the reservoir tank 3 in the upstream drying chamber 10, and each of the plurality of dehumidifying drums 12 is formed in a cylindrical shape and disposed in a direction along the width direction X of the extraction drying device 1 in the axial direction of the cylinder. In the present embodiment, in the

upstream drying chamber

10, 3 liquid-removing reels 12 are arranged in the vertical direction Z in such a manner that the positions of the extraction drying device 1 in the longitudinal direction Y are substantially the same and the axial directions of the cylinders are parallel to each other.

The temperature control drums 16 are arranged in the upstream drying chamber 10 in 1 number, are formed in a cylindrical shape similarly to the liquid removal drum 12, and are arranged in a direction along the width direction X of the extraction drying device 1 in the axial direction of the cylinder. The temperature control drum 16 is formed such that the diameter of the cylinder is larger than the diameter of the dewatering drum 12, and is disposed above the dewatering drum 12. In other words, the diameter of the cylinder of the dewatering roll 12 is relatively small, and the diameters of the 3 dewatering rolls 12 are substantially the same.

The film F can be wound around the liquid removal drum 12 and the temperature control drum 16 which are respectively formed in a cylindrical shape, and both the liquid removal drum 12 and the temperature control drum 16 can be rotated about the axial center of the cylinder by power supplied from a power source such as a motor. Therefore, the liquid removal roll 12 and the temperature control roll 16 can transport the wound film F from the reservoir tank 3 side to the downstream drying chamber 20 side by rotating in a state where the film F is wound.

When the film F is wound around the liquid removal roll 12 or the temperature control roll 16, both surfaces of the film F are wound so that the adjacent liquid removal rolls 12 or temperature control rolls 16 alternately contact each other. That is, in a state where the film F is wound around the liquid removal roll 12 or the temperature control roll 16, for example, two adjacent liquid removal rolls 12 are in contact with mutually different surfaces of the film F. In this way, the film F is wound around the liquid removal roll 12 or the temperature control roll 16, and the liquid removal roll 12 and the temperature control roll 16 are rotated in a state where the adjacent liquid removal roll 12 and the adjacent temperature control roll 16 alternately contact both surfaces of the film F, whereby the liquid removal roll 12 and the temperature control roll 16 transport the film F. At this time, the liquid removal rolls 12, which have a smaller diameter than the temperature control roll 16 and are arranged in the vertical direction Z, can convey the film F while applying pressure to the film F.

Further, the temperature can be adjusted by both the liquid removal drum 12 and the temperature adjustment drum 16. More specifically, a flow path through which warm water, the temperature of which is controlled by a temperature controller (not shown) disposed outside the drying chamber 6, flows is formed inside the dewatering roll 12 and the temperature control roll 16, and the warm water can circulate between the inside of the dewatering roll 12 and the temperature control roll 16 and the temperature controller. Accordingly, the temperature of the surface in contact with the film F can be adjusted to any temperature by adjusting the temperature or flow rate of the warm water flowing into the interior of the liquid removal drum 12 and the temperature control drum 16. For example, the temperature control roll 16 can set the temperature of the contact surface 16a in contact with the film F to a temperature equal to or higher than the boiling point of the solvent MC stored in the storage tank 3, and can convey the film F in a state where the temperature of the contact surface 16a is equal to or higher than the boiling point of the solvent MC.

The upstream air nozzle 13 as the liquid removing device 11 is disposed in the vicinity of the temperature control drum 16, and can blow the gas onto the outer peripheral surface of the temperature control drum 16, that is, the surface of the temperature control drum 16 on which the film F is conveyed. Thus, the upstream air nozzle 13 can blow the gas onto the surface of the film F opposite to the surface of the film F in contact with the temperature control roll 16 when the film F is conveyed by the temperature control roll 16.

The upstream air nozzle 13 can blow the gas supplied from the upstream drying chamber 10 toward the film F. More specifically, in the upstream drying chamber 10, a circulation 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 a portion above the upstream drying chamber 10, and the circulation exhaust duct 14 is connected to an upstream blower 17 as a blower via an air blowing path 18. Further, 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 blowing path 18, and the gas supplied from the upstream blower 17 can be supplied to the upstream air nozzle 13. Therefore, the upstream blower 17 can supply the gas obtained by sucking the gas from the circulation exhaust duct 14 side to the upstream air nozzle 13 through the blowing path 18.

Thereby, the upstream air nozzle 13 can blow out the gas supplied from the upstream blower 17 into the upstream drying chamber 10. Therefore, the upstream air nozzle 13 can blow the gas in the upstream drying chamber 10 discharged from the circulation exhaust duct 14 into the upstream drying chamber 10, in other words, the upstream air nozzle 13 can circulate the gas in the upstream drying chamber 10 and blow the gas into the film F in the upstream drying chamber 10.

At this time, the upstream blower 17 can supply the gas obtained by sucking the gas from the circulation exhaust duct 14 side to the upstream air nozzle 13 while adjusting the temperature. 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 can set the temperature of the gas to a set temperature by heating the gas by the heating device or cooling the gas by the cooling device. The upstream air blower 17 can supply the gas having been subjected to the temperature adjustment to the upstream air nozzle 13, and the upstream air nozzle 13 can blow the gas in the upstream drying chamber 10 having been subjected to the temperature adjustment to the film F in the upstream drying chamber 10.

A partition wall 30 disposed between the upstream drying chamber 10 and the downstream drying chamber 20 to partition the upstream drying chamber 10 and the downstream drying chamber 20 has a communicating portion 31 through which the film F conveyed from the upstream drying chamber 10 toward the downstream drying chamber 20 passes. The communication portion 31 is formed in the partition wall 30, and is a hole that communicates the upstream drying chamber 10 with the downstream drying chamber 20. Further, the communicating portion 31 is formed in the vicinity of the temperature control roll 16 disposed in the upstream side drying chamber 10 of the partition wall 30.

An intermediate roll sealing device 40 as a roll sealing device including a sealing roll 41 and a sealing member 42 is disposed in the communication portion 31 of the partition wall 30. The seal roll 41 is formed in a cylindrical shape similarly to the liquid removal roll 12 or the temperature control roll 16 disposed in the upstream drying chamber 10, and is disposed in a direction along the width direction X of the extraction drying device 1 in the axial direction of the cylinder. The film F can be wound around the seal roll 41 in the same manner as the liquid removal roll 12 and the temperature control roll 16 disposed in the upstream drying chamber 10, and the film F is wound around the seal roll 41 in a state where the surface opposite to the surface in contact with the temperature control roll 16 is in contact with the surface.

The seal drum 41 is rotatable about the axis of the column by power supplied from a power source such as a motor. Therefore, the seal roll 41 rotates while the film F is wound, and can convey the wound film F from the upstream drying chamber 10 side to the downstream drying chamber 20 side.

Further, inside the sealed drum 41, a flow path through which warm water whose temperature has been adjusted by a temperature adjuster (not shown) disposed outside the drying chamber 6 flows is formed, as in the case of the liquid removal drum 12 and the temperature adjustment drum 16, and warm water can circulate between the inside of the sealed drum 41 and the temperature adjuster. Thus, the seal 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 interior.

The seal members 42 are disposed at two positions on both sides of the seal roll 41 in the vertical direction Z, and are disposed at positions close to the surface of the seal roll 41. The seal member 42 is formed as a so-called labyrinth seal in which an approaching portion approaching the seal spool 41 and an expanding portion as a space formed between the seal spool 41 are alternately arranged in a circumferential direction around the axial center of the seal spool 41.

The film F that has passed through the communication portion 31 and is conveyed from the upstream drying chamber 10 toward the downstream drying chamber 20 passes through a gap between one of the sealing members 42 and the sealing roll 41, which are disposed at two positions on both sides of the sealing roll 41 in the vertical direction Z, and is conveyed from the upstream drying chamber 10 toward the downstream drying chamber 20. In the present embodiment, the film F passes through a space between the sealing member 42 disposed below the sealing roll 41 and the sealing roll 41, and is conveyed from the upstream drying chamber 10 to the downstream drying chamber 20. Since the film F passes between the sealing member 42 and the sealing roll 41 in this way, the sealing member 42 approaches the film F and faces a surface opposite to a surface of the film F fed by the sealing roll 41 on the side opposite to the sealing roll 41.

In the downstream drying chamber 20, a temperature control drum 21 and a downstream air nozzle 22 are disposed. A plurality of temperature control rolls 21 are disposed in the downstream drying chamber 20, and each of the plurality of temperature control rolls 21 is formed in a cylindrical shape and disposed in a direction along the width direction X of the extraction drying device 1 in the axial direction of the cylinder. In the present embodiment, 4 temperature control rolls 21 are disposed in the downstream drying chamber 20.

The diameters of all cylinders of the 4 temperature control rolls 21 arranged in the downstream drying chamber 20 are formed to be approximately the same size as the diameter of the temperature control roll 16 arranged in the upstream drying chamber 10. The film F can be wound around the temperature control rolls 21 disposed in the downstream drying chamber 20, and all of the 4 temperature control rolls 21 can be rotated about the axis of the cylinder by power supplied from a power source such as a motor. Therefore, the 4 temperature control rolls 21 can convey the wound film F from the side where the upstream drying chamber 10 is located toward the side opposite to the side where the upstream drying chamber 10 is located in the longitudinal direction Y by rotating in the state where the film F is wound.

Specifically, when the film F is wound around the temperature control rolls 21, the film F is wound around the 4 temperature control rolls 21 such that adjacent ones of the 4 temperature control rolls 21 are in different surface contact with each other. Further, among the 4 temperature control rolls 21 disposed in the downstream drying chamber 20, the temperature control roll 21 disposed closest to the upstream drying chamber 10 is wound in a state where the surface of the film F opposite to the surface in contact with the seal roll 41 of the intermediate roll sealing device 40 is in contact with the surface. The temperature control rolls 21 are rotated in a state where the temperature control rolls 21 are wound around 4 temperature control rolls 21 in this manner, whereby the wound film F can be conveyed.

In addition, in the interior of the temperature control drum 21, similarly to the liquid control drum 12 and the temperature control drum 16 disposed in the upstream side drying chamber 10, a flow path through which warm water whose temperature is controlled by a temperature controller (not shown) disposed in the exterior of the drying chamber 6 flows is formed, and the warm water can circulate between the interior of the temperature control drum 21 and the temperature controller. Thus, the temperature control drum 21 can control 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.

Further, the downstream side air nozzles 22 disposed in the downstream side drying chamber 20 are disposed both in the vicinity of the sealing roll 41 provided in the intermediate roll sealing device 40 and in the vicinity of the temperature control roll 21 closest to the upstream side drying chamber 10 among the 4 temperature control rolls 21 disposed in the downstream side drying chamber 20. The downstream air nozzle 22 can blow gas onto the outer peripheral surfaces of the sealing drum 41 and the temperature control drum 21, that is, the surfaces of the sealing drum 41 and the temperature control drum 21 that convey the film F. Thus, the downstream air nozzle 22 can blow the gas onto the surface of the film F opposite to the surface of the film F in contact with the sealing roll 41 or the temperature control roll 21 when the film F is conveyed in the sealing roll 41 or the temperature control roll 21 of the intermediate roll sealing device 40.

At this time, the sealing roll 41 of the intermediate roll sealing device 40 and the temperature control roll 21 closest to the upstream side drying chamber 10 among the 4 temperature control rolls 21 arranged in the downstream side drying chamber 20 are in contact with mutually different surfaces with respect to the film F. Therefore, the downstream air nozzles 22 arranged at two locations in the downstream drying chamber 20 can blow gas onto mutually different surfaces of the film F.

The downstream air nozzle 22 disposed in the downstream drying chamber 20 can blow the temperature-adjusted gas onto the film F. Specifically, the downstream air nozzle 22 is connected to a downstream blower 27 as a blower disposed outside the downstream drying chamber 20 via a blower path 28. The downstream blower 27 can suck the gas around the downstream blower 27 and supply the sucked gas to the downstream air nozzle 22 in the downstream drying chamber 20.

At this time, the downstream blower 27 can adjust the temperature of the sucked gas and supply the temperature-adjusted gas to the downstream air nozzle 22 through the air blowing 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 temperature of the gas can be set to the set temperature by the downstream blower 27 heating the gas by the heating device or cooling the gas by the cooling device. The downstream blower 27 can supply the gas whose temperature has been adjusted in this way to the downstream air nozzle 22, and the downstream air nozzle 22 can blow the gas whose temperature has been adjusted by the downstream blower 27 to the film F in the downstream drying chamber 20.

Further, in the downstream drying chamber 20, an exhaust duct 23 is disposed for discharging the gas in the downstream drying chamber 20 to the outside of the downstream drying chamber 20. The exhaust duct 23 is disposed 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 a blower, and the exhaust blower 24 can discharge the gas in the downstream drying chamber 20 to the outside of the downstream drying chamber 20 through the exhaust duct 23. A damper 25 for adjusting the flow rate of the gas flowing through the exhaust duct 23 is disposed between the downstream side drying chamber 20 of the exhaust duct 23 and the exhaust blower 24. 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.

An opening 26 is formed in a portion of the downstream drying chamber 20 opposite to the upstream drying chamber 10 in the longitudinal direction Y, through which the film F processed by the extraction and drying device 1 is sent out from the downstream drying chamber 20 to the outside of the downstream drying chamber 20, and through which the film F is sent out to a step subsequent to the extraction and drying device 1. An outlet-side roll sealing device 45 as a roll sealing device including a sealing roll 46 and a sealing member 47 is disposed in the opening 26 of the downstream drying chamber 20.

The seal roll 46 is formed in a cylindrical shape, similarly to the seal roll 41 of the intermediate roll sealing device 40, and is disposed in a direction along the width direction X of the extraction drying device 1 in the axial direction of the cylinder. The film F can be wound on the seal roll 46 in the same manner as the seal roll 41 of the intermediate roll sealing device 40. When the film F is wound around the sealing roll 46 of the outlet-side roll sealing device 45, the film F is wound in a state in which the surface of the film F opposite to the surface in contact with the temperature control roll 21 closest to the outlet-side roll sealing device 45 among the 4 temperature control rolls 21 arranged in the downstream drying chamber 20 is in contact with the surface.

The seal spool 46 of the outlet-side spool sealing device 45 is a so-called free spool that is rotated by an external force acting on the seal spool 46 without being supplied with power from a power source such as a motor, unlike the seal spool 41 of the intermediate spool sealing device 40. The temperature of the seal roll 46 of the outlet-side roll sealing device 45 is not adjusted unlike the seal roll 41 of the intermediate roll sealing device 40.

The seal members 47 of the outlet-side roll sealing device 45 are disposed at two positions on both sides of the seal roll 46 in the vertical direction Z, and are disposed at positions close to the surface of the seal roll 46. The seal member 47 of the outlet-side roll seal device 45 is formed as a so-called labyrinth seal in which, similarly to the seal member 42 of the intermediate roll seal device 40, an approaching portion approaching the seal roll 46 and an expanding portion serving as a space formed between the seal roll 46 are alternately arranged in a circumferential direction around the axial center of the seal roll 46.

The film F that has passed through the opening 26 of the downstream drying chamber 20 and has been transported from the inside of the downstream drying chamber 20 to the outside of the downstream drying chamber 20 passes through a space between the sealing member 47 and the sealing roll 46, which is one of the sealing members 47 disposed at two positions on both sides of the sealing roll 46 in the vertical direction Z, and is transported 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 passed between the sealing member 47 disposed above the sealing roll 46 and the sealing roll 46, and is transported from the inside of the downstream drying chamber 20 to the outside of the downstream drying chamber 20. Since the film F passes between the seal member 47 and the seal roll 46 in this way, the seal member 47 approaches the film F and faces a surface opposite to a surface of the film F fed from the seal roll 46 on the side opposite to the seal roll 46.

In the present embodiment, the control device 50, the indoor sensor 51, and the outdoor sensor 52 are further provided. The indoor sensor 51 is disposed in the downstream drying chamber 20 and is capable of detecting the pressure of the gas atmosphere in the downstream drying chamber 20. The outdoor sensor 52 is disposed outside the extraction and drying device 1, and can detect the atmospheric pressure outside the extraction and drying device 1. That is, the outdoor sensor 52 can detect the pressure of the gas atmosphere outside the downstream drying chamber 20.

The control device 50 can perform various controls of the extraction and drying device 1. The control device 50 includes a cpu (central Processing unit) for performing arithmetic Processing, and a ram (random Access memory) and a rom (read Only memory) that function as memories for storing various information. All or a part of the functions of the control device 50 are realized by loading an application program held in the ROM into the RAM and executing the application program by the CPU, and reading and writing data from and into the RAM or the ROM. The control device 50 may be dedicated to the extraction and drying device 1, may be shared with other devices, or may control the entire system in which the extraction and drying device 1 is incorporated.

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. 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 blown by the upstream blower 17 and the downstream blower 27, the temperature of the gas blown from the upstream blower 17 and the downstream blower 27, and the opening degree of the damper 25 can be controlled by the control device 50. Further, the rotation speed and temperature of the liquid removal roll 12 or the temperature control roll 16 disposed in the upstream drying chamber 10, the sealing roll 41 of the intermediate roll sealing device 40, and the temperature control roll 21 disposed in the downstream drying chamber 20 can be controlled by the control device 50.

< action of extraction drying apparatus 1>

The extraction and drying device 1 according to the present embodiment includes the above-described configuration, and its operation will be described below. The extraction and drying apparatus 1 extracts and dries a porous film F used for a separator of a lithium ion battery or the like in a process for producing the film F. When the extraction and drying of the film F is performed using the extraction and drying device 1, the film F is first wound around each roll such as the liquid removal roll 12 or the temperature control roll 16 provided in the extraction and drying device 1 before the operation of the extraction and drying device 1 is started, and the film F can be conveyed from these rolls. Thus, the film F can be continuously conveyed by rotating each of the bobbins.

By starting the operation of the extraction-drying apparatus 1 in the state where the film F is thus arranged, the film F of the thin film formed in the step on the upstream side in the conveying direction of the film F, which has many fine pores opened in the polyolefin-based resin and into which the liquid plasticizer enters, is conveyed to the extraction-drying apparatus 1. The film F is first transported to the extraction device 2 provided in the extraction and drying device 1, and the extraction device 2 dips the film F into the solvent MC stored in the stock tank 3 while transporting the film F from the stock tank roll 4 disposed in the stock tank 3, thereby removing the liquid plasticizer from the film F.

The film F from which the liquid plasticizer has been removed is transported 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 being conveyed, 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 in the film F. This ensures the surface pressure between the film F and the respective rolls that are in contact with the film F and transport the film F, and the friction between the film F and the rolls is ensured by the surface pressure. Therefore, by rotating the roll in a state where the frictional force is generated between the film F and the roll in this manner, the film F can be conveyed by the frictional force between the film F and the roll along with the rotation of the roll.

Fig. 2 is an explanatory diagram illustrating a process of drying the film F by the extraction and drying device 1 according to the embodiment. In order to remove the solvent MC adhering to the film F from the film F, the film F transferred from the extraction device 2 to the drying device 5 is transferred from the stock tank 3 to the upstream side drying chamber 10 located above the stock tank 3 and communicating with the stock tank 3. A plurality of liquid removal rolls 12 are disposed above the reservoir tank 3 in the upstream drying chamber 10, and the film F conveyed from the reservoir tank 3 to the upstream drying chamber 10 is first conveyed to the liquid removal rolls 12. Therefore, since the film F conveyed to the liquid removal roll 12 is the film F immediately after being immersed in the solvent MC in the reservoir tank 3, the film F is conveyed to the liquid removal roll 12 with a large amount of the solvent MC adhering to the surface thereof.

Here, in the stock 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 in the case where the liquid plasticizer is extracted by the solvent MC, 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 reservoir tank 3, the film F is conveyed to the upstream side drying chamber 10, and in a state before the solvent MC adhering to the film F is dried, the solvent MC adheres not only to the surface of the film F but also to the micropores formed in the film F. Therefore, when the liquid plasticizer is dissolved in the solvent MC stored in the reservoir 3, the plasticizer LP dissolved in the solvent MC as the liquid plasticizer enters the micropores of the film F (see fig. 2 and S1).

The film F transported from the storage tank 3 to the position of the dewatering roll 12 is transported by the dewatering roll 12 in a state where the solvent MC adheres to the surface in a large amount and the plasticizer LP enters the micropores. The liquid removing roll 12 has a smaller diameter than the temperature control roll 16, and the contact area between the film F wound on the liquid removing roll 12 and the liquid removing roll 12 is reduced. Therefore, the surface pressure of the contact portion of the film F and the fluid removal roll 12 becomes relatively large. Thus, the solvent MC adhering to the surface of the film F is exuded from between the film F and the dewatering roll 12 by the relatively large surface pressure acting between the film F and the dewatering roll 12, and the solvent MC flows downward.

A plurality of the liquid removing rolls 12 are arranged, and both surfaces of the film F in the thickness direction are brought into contact with one of the liquid removing rolls 12 and conveyed. Thus, the solvent MC adhering to the surface of the film F seeps out from between the film F and the fluid removal roll 12 by the surface pressure with the fluid removal roll 12 in any of the two surfaces of the film F in the thickness direction and flows downward. Therefore, the solvent MC adhering to the surface of the film F passing through the liquid removal roll 12 is removed to some extent by the liquid removal roll 12.

The temperature and the flow rate of the warm water flowing through the inside of the dehydration drum 12 are adjusted, thereby increasing the temperature of the outer peripheral surface of the dehydration drum 12, that is, the temperature of the portion of the dehydration drum 12 in contact with the film F, and increasing the temperature of the solvent MC adhering to the surface of the film F. This promotes vaporization of the solvent MC adhering to the surface of the film F, and the solvent MC also evaporates to remove the solvent MC adhering to the surface of the film F.

When the solvent MC adhering to the surface of the film F transported in the upstream drying chamber 10 is removed to some extent by the liquid removal roll 12, the film F is then transported to a position where the temperature control roll 16 is disposed downstream of the liquid removal roll 12 in the transport direction of the film F. An upstream air nozzle 13 is disposed in the vicinity of the temperature control drum 16, and the upstream air nozzle 13 blows gas onto the surface of the temperature control drum 16 to which the film F is conveyed when the film F is extracted and dried by the extraction and drying device 1. Therefore, when the film F is extracted and dried by the extraction and drying device 1, the upstream air nozzle 13 blows the wet air WA, which is the gas supplied from the upstream drying chamber 10, to the film F transported by the temperature control roll 16. The film F on which the wet air WA is blown from the upstream air nozzle 13 is blown with the wet air WA, and the solvent MC on the surface on which the wet air WA is blown off by the wet air WA. Thereby, the solvent MC on the surface of the film F on which the wet air WA is blown from the upstream air nozzle 13 is removed (see fig. 2 and S2).

In this way, the wet air WA, which is the gas blown onto the film F from the upstream air nozzle 13, becomes the gas supplied from the upstream blower 17. That is, the upstream blower 17 has its suction side of the gas connected to the circulation exhaust duct 14 provided in the upstream drying chamber 10 via the air blowing path 18, and when the upstream blower 17 is operated, the upstream blower 17 sucks the gas in the upstream drying chamber 10 from the circulation exhaust duct 14 and supplies the sucked gas to the upstream air nozzle 13. Thereby, the upstream air nozzle 13 blows the wet air WA, which is a gas supplied from the upstream drying chamber 10, to the film F conveyed by the temperature-adjusting roll 16.

When the gas sucked from the circulation exhaust duct 14 is supplied to the upstream air nozzle 13 by operating the upstream blower 17, the temperature of the gas is adjusted by the upstream blower 17 by a heating device or a cooling device provided in the upstream blower 17, and the gas whose temperature has been adjusted is supplied. By blowing the temperature-adjusted wet air WA toward the film F from the upstream air nozzle 13, vaporization of the solvent MC adhering to the surface of the film F is promoted, and the solvent MC is blown off efficiently.

The temperature of the gas by the upstream-side blower 17 is controlled by the control device 50 so that the heating device or the cooling device provided in the upstream-side blower 17 is operated to set the temperature of the gas to a preset temperature. The set temperature in this case is preferably set in a range from room 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 ℃, the set temperature is preferably set in a range from room temperature to about 60 ℃. The set temperature at the time of temperature adjustment of the gas by the upstream-side blower 17 is determined to be an optimum temperature for efficiently removing the solvent MC adhering to the surface of the film F at the time of trial operation of the extraction drying device 1, and the optimum temperature is set as the set temperature.

Here, the upstream drying chamber 10 communicates with the reservoir tank 3 located below the upstream drying chamber 10, and the reservoir tank 3 is open to the upstream drying chamber 10. Further, the solvent MC is stored in the storage tank 3. Since the solvent MC is liquid, it gradually vaporizes by evaporation, and the solvent MC that becomes gas gradually accumulates in the upstream drying chamber 10. Thereby, the gas atmosphere in the upstream drying chamber 10 is filled with the solvent MC, i.e., the solvent gas MCG, which is a gas. That is, the inside of the upstream drying chamber 10 becomes a gas atmosphere rich in the solvent gas MCG.

Therefore, the wet air WA, which is a gas supplied from the upstream drying chamber 10 and blown by the upstream air nozzle 13, is also a humid gas containing a large amount of the solvent gas MCG. Therefore, the film F blown with the wet air WA from the upstream air nozzle 13 is not dried, and the solvent MC on the surface is blown away. Further, the upstream air nozzle 13 blows the film F with the wet air WA supplied from the inside of the upstream drying chamber 10, not the gas outside the upstream drying chamber 10, but with the gas in the upstream drying chamber 10 being circulated, so that the gas atmosphere rich in the solvent gas MCG is maintained in the upstream drying chamber 10.

When the film F is transported by the temperature control roll 16, the temperature and flow rate of the hot 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 equal to or higher than the boiling point of the solvent MC. Thus, 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 solvent MC in which the plasticizer LP is dissolved, which has entered the micropores of the film F, is boiled. The bumping solvent MC is released out of the membrane F together with the plasticizer LP dissolved in the solvent MC, and micropores H are formed at a portion of the membrane F where the bumping solvent MC containing the plasticizer LP is located.

At this time, since the wet air WA is blown to the film F conveyed by the temperature control roll 16 through the upstream air nozzle 13, the solvent MC that is boiled and released outside the film F is blown off by the wet air WA blown from the upstream air nozzle 13 immediately after being released outside the film F. Thus, the plasticizer LP dissolved in the solvent MC is blown off together with the solvent MC, and therefore 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 solvent MC on the surface is not dried, and the film F blown off by the wet air WA blown from the upstream air nozzle 13 at the position of the temperature-adjusting roll 16 passes through the communicating portion 31 of the partition wall 30 and then is directed toward the downstream drying chamber 20. Here, since the intermediate roll sealing device 40 is disposed in the communication portion 31 of the partition wall 30, the gas atmosphere of the upstream side drying chamber 10 and the gas atmosphere of the downstream side drying chamber 20 are partitioned by the intermediate roll sealing device 40. Therefore, the gas is hard to move between the upstream drying chamber 10 and the downstream drying chamber 20, and the gas atmosphere of the solvent-rich gas MCG in the upstream drying chamber 10 is maintained in the upstream drying chamber 10 by the intermediate roll sealing device 40.

In detail, the intermediate roll sealing device 40 has a sealing roll 41 that conveys the film F, and a sealing member 42 that is close to the sealing roll 41 and has a labyrinth structure; the film F conveyed from the upstream side drying chamber 10 side to the downstream side drying chamber 20 side is conveyed through between the sealing roll 41 and the sealing member 42. That is, on the opposite surface side of the surface of the film F conveyed from the upstream drying chamber 10 side to the downstream drying chamber 20 side by the sealed roll 41 to the surface contacting the sealed roll 41, the seal member 42 having a labyrinth structure with a very small gap from the film F is arranged. Thus, the gas of the solvent-rich 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 conveyed from the upstream drying chamber 10 side to the downstream drying chamber 20 side.

Since the downstream drying chamber 20 is not communicated with the storage tank 3 storing the solvent MC unlike the upstream drying chamber 10, the 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 dried compared to the upstream drying chamber 10. Therefore, the film F conveyed from the upstream drying chamber 10 to the downstream drying chamber 20 by the seal roll 41 of the intermediate roll sealing device 40 is conveyed in the dry gas atmosphere in the downstream drying chamber 20.

Further, a downstream air nozzle 22 is disposed in the vicinity of the seal roll 41 of the intermediate roll sealing device 40, and the downstream air nozzle 22 blows dry air DA as a gas supplied from the outside of the downstream drying chamber 20 onto the surface of the seal roll 41, on which the film F is conveyed, when the film F is extracted and dried by the extraction and drying device 1. Therefore, when the extraction and drying of the film F is performed by the extraction and drying device 1, the downstream air nozzle 22 disposed near the seal roll 41 blows the dry air DA to the film F transported by the seal roll 41. The film F blown with the dry air DA from the downstream air nozzle 22 disposed in the vicinity of the sealing drum 41 is blown with the dry air DA to fly off the solvent MC on the face blown with the dry air DA.

Further, 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 blown with the dry air DA from the downstream air nozzle 22 enters the micropores H of the film F located in the vicinity of the surface blown with the dry air DA, and the solvent MC in which the plasticizer LP is dissolved is easily evaporated by the dry air DA blown from the downstream air nozzle 22. That is, the dry air DA is blown from the downstream air nozzle 22 to the film F in a dry gas atmosphere, whereby the film F is dried quickly. Thus, the plasticizer LP dissolved in the solvent MC is removed together with the solvent MC from the micropores H of the film F located in the vicinity of the surface blown with the dry air DA from the downstream air nozzle 22, and the micropores H are formed in the film F (see fig. 2 and S3).

In the downstream drying chamber 20, a plurality of temperature control rolls 21 are arranged, and the film F conveyed from the sealing roll 41 of the intermediate roll sealing device 40 is sequentially conveyed by the plurality of temperature control 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 first conveyed by the temperature control roll 21 located closest to the sealing roll 41 in the conveying direction of the film F among the plurality of temperature control rolls 21. That is, the film F conveyed by the seal roll 41 of the intermediate roll sealing device 40 is first conveyed by the temperature control roll 21 located on the most upstream side in the conveying direction of the film F among the plurality of temperature control rolls 21.

The downstream air nozzle 22 is disposed in the vicinity of the temperature control roll 21 located closest to the sealing roll 41 among the plurality of temperature control rolls 21, and when the extraction and drying device 1 extracts and dries the film F, the downstream air nozzle 22 blows dry air DA as gas supplied from the outside of the downstream drying chamber 20 onto the surface of the temperature control roll 21 on which the film F is conveyed. Therefore, when the film F is extracted and dried by the extraction and drying device 1, the downstream air nozzle 22 blows the dry air DA to the film F conveyed by the temperature-controlled roll 21.

Here, the downstream air nozzle 22 disposed in the vicinity of the seal roll 41 of the intermediate roll sealing device 40 and the downstream air nozzle 22 disposed in the vicinity of the temperature control roll 21 disposed closest to the seal roll 41 among the plurality of temperature control rolls 21 can blow the dry air DA to the different surfaces of the film F. Therefore, the downstream air nozzle 22 disposed in the vicinity of the temperature control roll 21 blows the dry air DA toward the surface opposite to the surface on which the dry air DA is blown by the downstream air nozzle 22 disposed in the vicinity of the seal roll 41 with respect to the film F conveyed by the temperature control roll 21 positioned on the most upstream side in the conveying direction of the film F among the plurality of temperature control rolls 21.

Thereby, the portion of the film F near the surface of the film F from which the dry air DA is blown by the downstream air nozzle 22 disposed near the temperature control drum 21 is quickly dried, and the solvent MC in which the plasticizer LP is dissolved and which has entered the micropores H of the film F is evaporated. That is, by blowing the dry air DA from the downstream air nozzle 22 disposed in the vicinity of the temperature-adjusting roll 21, the portion of the film F in the vicinity of the surface opposite to the surface dried quickly by the downstream air nozzle 22 disposed in the vicinity of the sealing roll 41 is dried quickly. Therefore, the plasticizer LP dissolved in the solvent MC is also removed together with the solvent MC from the micropores H of the film F located in the vicinity of the surface of the film F to which the dry air DA is blown from the downstream air nozzle 22 disposed in the vicinity of the temperature-adjusting roll 21, and the micropores H are formed in the entire film F in the thickness direction (see fig. 2 and S4).

As described above, the dry air DA blown onto the film F from the sealing roll 41 disposed in the intermediate roll sealing device 40 or the downstream air nozzle 22 disposed in the vicinity of the temperature control roll 21 in the downstream drying chamber 20 is supplied from the downstream blower 27. That is, the downstream blower 27 has its gas suction side communicated with the atmosphere outside the downstream drying chamber 20, and sucks the gas outside the downstream drying chamber 20 and supplies the sucked gas to the downstream air nozzle 22 when the downstream blower 27 is operated. Thus, the downstream air nozzle 22 blows the dry air DA sucked from the outside of the downstream drying chamber 20 to the film F conveyed by the seal roll 41 of the intermediate roll sealing device 40 or the temperature control roll 21 disposed in the downstream drying chamber 20.

When the gas outside the downstream drying chamber 20 is supplied to the downstream air nozzle 22 by operating the downstream blower 27, the temperature of the gas is adjusted by the downstream blower 27 by a heating device or a cooling device provided in the downstream blower 27, and the gas whose temperature has been adjusted is supplied as dry air DA. By blowing the temperature-adjusted dry air DA from the downstream air nozzle 22 toward the film F, vaporization of the solvent MC adhering to the surface of the film F, the solvent MC present in the interior of the film F, and the plasticizer LP is promoted, and the solvent MC and the plasticizer LP are efficiently removed.

The temperature of the gas is adjusted by the downstream blower 27 so that the temperature of the gas becomes a preset temperature by controlling the downstream blower 27 by the control device 50 and operating the heating device or the cooling device provided in the downstream blower 27. The set temperature in this case is preferably set in a range from room temperature to a temperature around the boiling point of the solvent MC. The set temperature at the time of temperature adjustment of the gas by the downstream-side blower 27 is determined to be an optimum temperature for efficiently removing the solvent MC in which the plasticizer LP is dissolved, which has entered the micropores H of the membrane F, during the test operation of the extraction drying apparatus 1, and the optimum temperature is set to be the set temperature.

The film F onto which the dry air DA is blown by the downstream air nozzle 22 at the position of the temperature control roll 21 located on the most upstream side in the transport direction of the film F among the plurality of temperature control rolls 21 arranged in the downstream drying chamber 20 is sequentially transported to the downstream side in the transport direction by the rotation of the temperature control roll 21. Therefore, the film F is fed from the seal roll 41 of the intermediate roll sealing device 40 to the downstream side in the feeding direction while sequentially contacting the plurality of temperature control rolls 21 arranged in the downstream side drying chamber 20. At this time, the sealing roll 41 and the temperature control roll 21 are brought into contact with the film F in a state in which the temperature thereof is controlled by the warm water flowing inside. Accordingly, the temperature of the film F conveyed by the sealing roll 41 and the temperature-adjusting 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 efficiently removed.

Further, an exhaust duct 23 is provided in the downstream drying chamber 20 in which a downstream air nozzle 22 for blowing out the dry air DA supplied from the outside of the downstream drying chamber 20 into the downstream drying chamber 20 is disposed, and the gas in the downstream drying chamber 20 is exhausted from the exhaust duct 23. Since the exhaust blower 24 is connected to the exhaust duct 23 and the damper 25 is disposed, the gas in the downstream drying chamber 20 exhausted from the exhaust duct 23 is sucked by the exhaust blower 24 while adjusting the flow rate by the damper 25, and is exhausted to the outside of the downstream drying chamber 20. The gas in the downstream drying chamber 20 is exhausted from the exhaust duct 23 while the flow rate of the gas is adjusted by the damper 25, whereby the pressure of the gas atmosphere in the downstream drying chamber 20 is adjusted to a negative pressure with respect to the atmospheric pressure around the downstream drying chamber 20. The pressure in the downstream drying chamber 20 is adjusted by the control device 50.

The control device 50 obtains a detection value of the pressure of the gas atmosphere inside the downstream drying chamber 20 obtained by the indoor sensor 51 and a detection value of the pressure of the gas atmosphere outside the downstream drying chamber 20 obtained by the outdoor sensor 52, compares the detection values, and operates the damper 25 based on the comparison result to adjust the opening degree of the damper 25. At this time, the controller 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 detection value of the pressure of the gas atmosphere inside the downstream side drying chamber 20 by the indoor sensor 51 is larger than the detection value of the pressure of the gas atmosphere outside the downstream side drying chamber 20 by the outdoor sensor 52, that is, when the pressure of the gas atmosphere inside the downstream side drying chamber 20 is higher than the atmospheric pressure, the control device 50 increases the opening degree of the damper 25. 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, thereby lowering the pressure of the gas atmosphere in the downstream drying chamber 20. When the pressure of the atmosphere in the downstream drying chamber 20 is higher than the atmospheric pressure, the opening degree of the damper 25 is increased to lower the pressure of the atmosphere in the downstream drying chamber 20, so that the pressure of the atmosphere in the downstream drying chamber 20 becomes negative with respect to the atmospheric pressure around the downstream drying chamber 20.

Further, when the detection value of the pressure of the gas atmosphere inside the downstream side drying chamber 20 by the indoor sensor 51 is smaller than the detection value of the pressure of the gas atmosphere outside the downstream side drying chamber 20 by the outdoor sensor 52, that is, when the pressure of the gas atmosphere inside the downstream side drying chamber 20 is lower than the atmospheric pressure, the control device 50 decreases the opening degree of the damper 25. This reduces the flow rate of the gas in the downstream drying chamber 20 sucked by the exhaust blower 24, reduces the gas exhausted from the exhaust duct 23, and suppresses a decrease in the pressure of the gas atmosphere in the downstream drying chamber 20.

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 nozzle 22, so that the gas exhausted from the exhaust duct 23 is reduced, and thus the pressure drop of the gas atmosphere in the downstream drying chamber 20 can be suppressed. When the pressure of the gas atmosphere in the downstream drying chamber 20 is lower than the atmospheric pressure, the opening degree of the damper 25 is reduced in this manner to suppress a decrease in the pressure of the gas atmosphere in the downstream drying chamber 20, so that the pressure of the gas atmosphere in the downstream drying chamber 20 is not too low relative to the atmospheric pressure around the downstream drying chamber 20.

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

By thus exhausting the pressure of the gas atmosphere in the downstream drying chamber 20 from the exhaust duct 23, the pressure of the gas atmosphere in the downstream drying chamber 20 becomes negative with respect to the atmospheric pressure, and therefore the solvent MC and the plasticizer LP present in the film F are easily vaporized. Thus, the film F conveyed in the downstream drying chamber 20 is dried while being conveyed in the downstream drying chamber 20 without leaving the plasticizer LP 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 sealing device 45 is disposed in the opening 26 of the downstream drying chamber 20, the web is conveyed out of the downstream drying chamber 20 through the outlet-side roll sealing device 45. Here, since the outlet-side roll sealing device 45 is disposed in the opening 26 of the downstream drying chamber 20 in this manner, the gas atmosphere in the downstream drying chamber 20 and the atmosphere outside the downstream drying chamber 20 are partitioned by the outlet-side roll sealing device 45. Therefore, the gas is less likely to move between the inside and the outside of the downstream drying chamber 20, and the gas atmosphere in the downstream drying chamber 20 is maintained at a negative pressure with respect to the atmospheric pressure by the outlet-side roll sealing device 45.

Specifically, the outlet-side roll sealing device 45 includes a seal roll 46 that conveys the film F, and a seal member 47 having a labyrinth structure in proximity to the seal roll 46; the film F conveyed from the inside of the downstream side drying chamber 20 to the outside of the downstream side drying chamber 20 is conveyed through between the seal roll 46 and the seal member 47. That is, on the opposite surface side to the surface of the film F that is conveyed from the inside of 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 seal member 47 having a labyrinth structure with a very small gap from the film F is disposed. Thus, when the film F is fed out from the downstream side drying chamber 20 to the outside of the downstream side drying chamber 20, the atmosphere outside the downstream side drying chamber 20, which is higher in pressure than the gas atmosphere inside the downstream side drying chamber 20, is blocked by the sealing member 47 included in the outlet side roll sealing device 45, and is less likely to enter the downstream side drying chamber 20.

Further, since the downstream drying chamber 20 is at a negative pressure with respect to the atmospheric pressure around the downstream drying chamber 20, the gas in the downstream drying chamber 20 is less likely to flow out of the downstream drying chamber 20 through the gap between the sealing member 47 and the film F or the gap between the sealing roll 46 and the sealing member 47 included in the outlet-side roll sealing device 45. Therefore, the gas vaporized from the solvent MC or the plasticizer LP is less likely to leak from the downstream drying chamber 20 to the outside of the downstream drying chamber 20.

The film F, which has been extracted with the solvent by the extraction device 2, dried by the drying device 5, and sent out of the downstream drying chamber 20 through the outlet-side roll sealing device 45, is transported to the downstream side of the extraction and drying device 1.

< effects of the embodiment >

In the extraction drying device 1 according to the above embodiment, the drying chamber 6 of the drying device 5 includes the upstream side drying chamber 10 and the downstream side drying chamber 20, and the upstream side drying chamber 10 and the downstream side drying chamber 20 are partitioned by the partition wall 30. The upstream drying chamber 10 communicates with the reservoir tank 3 for storing the solvent MC, and the downstream drying chamber 20 is provided with a downstream air nozzle 22 for blowing a temperature-adjusted gas to the film F conveyed in the downstream drying chamber 20. Thus, the solvent MC adhering to the film F can be removed in a liquid state in the upstream drying chamber 10, and the film F can be dried in the downstream drying chamber 20 after the solvent MC is removed without drying the film F. Therefore, it is possible to prevent the liquid plasticizer dissolved in the solvent MC from vaporizing and remaining on the film F due to rapid drying of the film F from which the liquid plasticizer is extracted by the solvent MC.

Here, a 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 illustrating a process of drying the film F by the extraction and drying device 101 shown in fig. 3. As shown in fig. 3, for example, a conventional extraction and drying apparatus 101 includes an extraction apparatus 102 and a drying apparatus 105, and the extraction apparatus 102 includes a reservoir tank 103 in which a reservoir tank roll 104 for transporting a film F is disposed to store a solvent MC. The drying device 105 includes 1 drying chamber 106, and a dehumidifying drum 111, a temperature-adjusting drum 112, an air nozzle 113, and an exhaust duct 114 are disposed in the drying chamber 106. The plurality of liquid removal rolls 111 are formed of rolls having a smaller diameter than the temperature control roll 112, and are disposed above the reservoir tank 103, and the plurality of temperature control rolls 112 are disposed downstream of the liquid removal rolls 111 in the transport direction of the film F. The air nozzle 113 is disposed in the vicinity of the temperature control roll 112, and can blow the gas outside the drying chamber 106 onto the film F conveyed by the temperature control roll 112, and the exhaust duct 114 exhausts the gas inside the drying chamber 106 to the outside of the drying chamber 106.

The conventional extraction and drying apparatus 101 has a water seal structure 120 as shown in fig. 3 as a seal structure of a portion for feeding the film F dried in the drying chamber 106 from the inside of 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 roll 122 for transporting the film F through the water seal structure 120, and a water seal air nozzle 123 for blowing air to the film F transported by the water seal roll 122.

In the water seal 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 the state where the water W is stored in the sealed water tank 121, and the water W stored in the sealed water tank 121 is sealed between the inside gas environment and the outside gas environment of the drying chamber 106. The film F having passed through the water seal structure 120 is fed out from the inside of the drying chamber 106 to the outside of the drying chamber 106 by passing through the water W stored in the seal water tank 121 for sealing, and the film F having passed through the water W is blown away by the gas blown from the water seal air nozzle 123.

In the conventional extraction and drying apparatus 101 configured as described above, 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 chamber 106 of the drying apparatus 105. The film F transferred from the reservoir tank 103 to the drying chamber 106 is first transferred to the liquid removal roll 111 in a state where a large amount of the solvent MC adheres to the surface (see fig. 4 and S11).

In the liquid removal roll 111, the solvent MC adhering to the surface of the film F is removed to some extent. The film F having passed through the liquid removal roll 111 is then transported to a position where the temperature control roll 112 is disposed downstream of the liquid removal roll 111 in the transport direction of the film F. An air nozzle 113 is disposed near the temperature control roll 112, and the air nozzle 113 blows dry air DA as a dry gas supplied from the outside of the drying chamber 106 to the film F conveyed by the temperature control roll 112. As a result, the solvent MC on the surface of the film F blown with the dry air DA from the air nozzle 113 is blown off by the dry air DA, and the solvent MC on the surface of the film F blown with the dry air DA from the air nozzle 113 is removed (see fig. 4 and S12).

The temperature of the film F is increased by adjusting the temperature of the temperature control roll 112 so that the solvent MC containing the plasticizer LP entering the micropores H of the film F can be vaporized. Thus, the solvent MC that has entered the micropores H of the film F is vaporized, but the solvent MC that has adhered to the film F is much and is vaporized in a state that it is easily dried by blowing the dry air DA, and therefore, the plasticizer LP dissolved in the solvent MC may remain as the residual plasticizer RLP in some of the solvent MC that has entered the micropores H. That is, since the solvent MC is vaporized in a state where the solvent MC adheres to the film F in a large amount and is easily vaporized, only the solvent MC is vaporized while leaving the plasticizer LP dissolved in the solvent MC in the micropores H, and the residual plasticizer RLP is easily left in the micropores H.

The film F having the residual plasticizer RLP on the micropores H or the surface thereof is transported by the plurality of temperature control rolls 112 while the plurality of temperature control rolls 112 alternately contact both surfaces of the film F, and the solvent MC adhering to the surface of the film F is vaporized by the temperature control rolls 112 while the temperature of the film F is raised, and is removed (see fig. 4 and S13).

Further, when the solvent MC adhering to the surface of the film F is blown off by the dry air DA blown from the air nozzle 113 disposed in the vicinity of the temperature-adjusting drum 112, a part of the blown-off solvent MC may float in the drying chamber 106 as droplets and adhere to the surface of the film F from which the solvent MC has been removed. In this case, of the solvent MC adhering to the film F, only the solvent MC may be vaporized while the plasticizer LP dissolved in the solvent MC remains, and the residual plasticizer RLP may remain on the surface of the film F.

The membrane F from which the solvent MC has been removed is sent out of the drying chamber 106 through the water seal structure 120, and is sent to the subsequent steps of the extraction and drying apparatus 101. Therefore, the film F with the residual plasticizer RLP is transported from the extraction and drying device 101 to the subsequent step.

Fig. 5 is an explanatory diagram of the oil stain M. The residual plasticizer RLP remaining on the fine holes H of a part of the film F or the surface of the film F appears on the film F as oil stains M in a continuous pattern of a band-like wave shape or a pattern of a plurality of transparent dots. The appearance of the oil stains M is poor and the oil stains M are detected as defects in an inspection apparatus that inspects the manufactured film F, but in the conventional extraction and drying apparatus 101 as shown in fig. 3, the oil stains M are likely to occur on the film F when the extraction and drying of the liquid plasticizer are performed.

In the extraction drying device 1 according to the present embodiment, the upstream drying chamber 10 communicating with the reserve tank 3 is partitioned from the downstream drying chamber 20 by the partition wall 30, and the gas atmosphere in the upstream drying chamber 10 is a solvent-rich gas atmosphere filled with the solvent gas MCG as the solvent MC. Therefore, when the solvent MC adhering to the film F after extraction of the liquid plasticizer with the solvent MC is removed in the upstream drying chamber 10 by the liquid removal roll 12 or the upstream air nozzle 13 of the liquid removal device 11, the solvent MC adhering to the film F transported in the gas atmosphere filled with the solvent gas MCG is difficult to vaporize.

Further, since the inside of the upstream drying chamber 10 is a gas atmosphere rich in the solvent gas MCG, even when droplets of the solvent MC blown off from the film F adhere to the film F in the upstream drying chamber 10, the adhering solvent MC is difficult to vaporize, and the droplets of the solvent MC are difficult to dry.

In the upstream drying chamber 10, the solvent MC adhering to the film F is removed in the gas atmosphere filled with the solvent gas MCG in this manner, thereby reducing the solvent MC adhering to the film F while suppressing vaporization of the solvent MC, and the film F with the reduced adhering solvent MC is conveyed from the upstream drying chamber 10 to the downstream drying chamber 20. In other words, in the upstream drying chamber 10, the amount of the solvent MC adhering to the film F can be reduced by removing the solvent MC adhering to the film F as a liquid, and drying of the solvent MC adhering to the film F as adhering to the film F can be suppressed.

In the downstream drying chamber 20, the temperature-adjusted dry air DA is blown through the downstream air nozzle 22 to the film F with the reduced amount of the adhering solvent MC. Thus, the solvent MC that has been deposited in a small amount and that has entered the micropores H is also blown off by the dry air DA blown from the downstream air nozzle 22 in the film F, and therefore the plasticizer LP dissolved in the solvent MC is not left on the film F and the solvent MC is blown off. The dry air DA blown from the downstream air nozzle 22 onto the film F is a gas whose temperature has been adjusted by the downstream air blower 27, that is, the downstream air nozzle 22 blows warm air onto the film F. Therefore, the small amount of the solvent MC adhering to the film F is accelerated to be vaporized and removed from the film F by the temperature increase due to the warm air blown from the downstream air nozzle 22.

In the extraction drying device 1 according to the present embodiment, the solvent MC adhering to the film F is reduced in a liquid state in the gas atmosphere rich in the solvent gas MCG in the upstream side drying chamber 10, and the solvent MC adhering to the film F is removed in the dry gas atmosphere in the downstream side drying chamber 20, whereby 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, and the solvent MC can be appropriately removed including the plasticizer LP dissolved in the solvent MC, and the residual plasticizer RLP can be suppressed from remaining on the film F as the oil stain M. As a result, the occurrence of oil stain M can be suppressed.

In the conventional extraction and drying apparatus 101 as shown in fig. 3, the solvent MC adhering to the film F is removed by the liquid removal drum 111 in a gas atmosphere in which the solvent MC is easily vaporized, and therefore the film F may be partially dried before the film F is dried by blowing the dry air DA from the air nozzle 113. In this case, the film F may partially shrink due to partial drying, and may be loosened, wrinkled or rippled, or may have unevenness in physical properties such as shrinkage.

On the other hand, in the extraction drying device 1 according to the present embodiment, since the solvent MC adhering to the film F is removed by the liquid removal roll 12 in the gas atmosphere filled with the solvent gas MCG in the upstream drying chamber 10, the film F can be prevented from drying while being transported in the upstream drying chamber 10. This can prevent the film F from being partially dried, and thus can prevent the film F from being loosened, wrinkled or rippled, or from being uneven in physical properties such as shrinkage. As a result, a high-quality film F can be obtained.

As another method for suppressing the generation of the oil stain M on the film F, a method of increasing the capacity of the reservoir tank 3 and increasing the amount of the solvent MC stored in the reservoir tank 3 to lower the concentration of the plasticizer LP dissolved in the solvent MC may be considered. 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 storage tank 3 becomes larger, and the size of the entire extraction and drying apparatus 1 becomes larger, so that the cost of the extraction and drying apparatus 1 increases, or the running cost increases as the solvent MC is used in a larger amount.

On the other hand, in the extraction and drying apparatus 1 according to the present embodiment, the generation of the oil stains M on the film F can be suppressed without increasing the amount of the solvent MC used, and therefore, the generation of the oil stains M can be suppressed without increasing the capacity of the reservoir tank 3. As a result, increases in the equipment cost and the running cost can be suppressed.

As another method for suppressing the generation of the oil stains M on the film F, there is conceivable a method of reducing the forming speed of the film F and increasing the time for immersing the film F in the solvent MC in order to decrease the concentration of the plasticizer LP dissolved in the solvent MC adhering to the film F after extracting the liquid plasticizer from the solvent MC. However, when the film F is formed at a low speed, the overall production time required for producing the film F is also likely to be long.

On the other hand, in the extraction and drying apparatus 1 according to the present embodiment, the time required for the production of the film F can be suppressed from increasing because the plasticizer LP dissolved in the solvent MC adhering to the film F is removed together with the solvent MC without increasing the time required for immersing the film F in the solvent MC. As a result, the generation of the oil stains M on the film F can be suppressed while suppressing the manufacturing time of the film F from becoming long.

Further, since the downstream drying chamber 20 is adjusted to a negative pressure with respect to the atmospheric pressure around the downstream drying chamber 20, the vaporization of the solvent MC that has entered the micropores H of the film F and the solvent MC that has adhered to the surface of the film F can be more reliably promoted in the downstream drying chamber 20. Thus, in the downstream drying chamber 20, the plasticizer LP dissolved in the solvent MC can be more reliably removed 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 the oil stain M can be more reliably suppressed.

Further, since the intermediate roll sealing device 40 including the sealing roll 41 and the sealing member 42 is disposed in the communication portion 31 of the partition wall 30, the film F can be conveyed from the upstream drying chamber 10 to the downstream drying chamber 20 while maintaining the inside of the upstream drying chamber 10 in a gas atmosphere filled with the solvent gas MCG. Thus, in the upstream drying chamber 10, the solvent MC adhering to the film F can be more reliably removed while being in a liquid state, and the solvent MC adhering to the film F can be more reliably prevented from being dried while adhering to the film F. Therefore, it is possible to more reliably suppress the residual plasticizer RLP from remaining on the film F by the solvent MC adhering to the film F drying as it adheres to the film F. As a result, the occurrence of the oil stain M can be more reliably suppressed.

Further, since the liquid removing roll 12 that conveys the film F while applying pressure to the film F is used as the liquid removing device 11 that removes the solvent MC adhering to the film F conveyed in the upstream drying chamber 10, the solvent MC adhering to the film F can be removed while conveying the film F by the liquid removing roll 12. This can simplify the structure for removing the solvent MC adhering to the film F, and can suppress an increase in the number of components when the liquid removing device 11 is disposed in the upstream drying chamber 10. As a result, the generation of the oil stain M can be suppressed while suppressing the increase in the manufacturing cost of the extraction drying device 1.

Further, since the upstream air nozzle 13 for blowing the gas supplied from the upstream drying chamber 10 toward the film F is used as the liquid removing device 11 for removing the solvent MC adhering to the film F conveyed in the upstream drying chamber 10, the gas can be blown toward the film F while maintaining the inside of the upstream drying chamber 10 in a gas atmosphere filled with the solvent gas MCG. This can more reliably suppress vaporization of the solvent MC adhering to the film F in the upstream drying chamber 10, and can more reliably remove the solvent MC adhering to the film F as a liquid. Therefore, the solvent MC adhering to the film F can be more reliably inhibited from drying as it adheres to the film F, and the residual plasticizer RLP remaining on the film F as it dries as it adheres to the film F can be more reliably inhibited from drying. As a result, the occurrence of the oil stain M can be more reliably suppressed.

Further, since the temperature control roll 16 capable of conveying the film F by bringing the temperature of the contact surface 16a with the film F to a temperature equal to or higher than the boiling point of the solvent MC is disposed in the upstream drying chamber 10, the solvent MC entering the micropores H of the film F can be boiled when the film F is conveyed by the temperature control roll 16. This allows the solvent MC that has entered the micropores H to be released outside the film F together with the plasticizer LP dissolved in the solvent MC, thereby more reliably preventing the plasticizer L from remaining in the micropores H as the residual plasticizer RLP. As a result, the occurrence of the oil stain M can be more reliably suppressed.

Further, since the exhaust duct 23 disposed in the downstream side drying chamber 20 is disposed on the bottom surface of the downstream side drying chamber 20, it is possible to suppress the droplets of the solvent MC blown off by the downstream side air nozzle 22 in the downstream side drying chamber 20 from adhering to the film F. That is, the mist of the solvent MC blown off by the downstream air nozzle 22 falls downward by gravity, but since the exhaust duct 23 is disposed on the bottom surface of the downstream drying chamber 20 and exhausts the gas in the downstream drying chamber 20 from the lower side of the downstream drying chamber 20, the mist of the solvent MC falling downward can be efficiently discharged to the outside of the downstream drying chamber 20. This can more reliably prevent the droplets passing through the solvent MC from floating in the downstream drying chamber 20 and easily adhering to the film F. Therefore, the residual plasticizer RLP can be more reliably suppressed from remaining on the surface of the film F due to the adhesion of the droplets of the solvent MC to the film F. As a result, the occurrence of the oil stain M can be more reliably suppressed.

[ modified examples ]

In the above-described embodiment, the solvent MC for extracting the liquid plasticizer impregnated in the film F is stored in the storage tank 3 of the extraction device 2, but the liquid stored in the storage tank 3 may be other than the solvent MC. The extraction apparatus 2 may be, 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 film F; the reservoir for storing the solvent MC is disposed upstream of the reservoir 3 for storing water in the transport direction of the film F, and the upstream drying chamber 10 communicates with the reservoir 3 for storing water. That is, the film F passing through the water stored in the storage tank 3 may be conveyed to the upstream side drying chamber 10.

In the case where the film F passed through the solvent MC is removed by the water stored in the storage tank 3, the liquid plasticizer impregnated in the film F may slightly remain on the film F conveyed to the upstream drying chamber 10. Therefore, even in such a case, the gas atmosphere in the upstream drying chamber 10 can be changed to a gas atmosphere filled with the vapor of the water stored in the storage tank 3 by communicating the upstream drying chamber 10 with the storage tank 3, and the water adhering to the film F can be removed and reduced in the upstream drying chamber 10 as a liquid. This can suppress drying of the water adhering to the film F as it adheres to the film F, and can suppress the plasticizer LP slightly remaining on the film F from remaining as the residual plasticizer RLP and can suppress the generation of the oil stain M.

The liquid removal drum 12, the upstream air nozzle 13, and the temperature control drum 16 disposed in the upstream drying chamber 10 may be disposed in different numbers or in different arrangements from those of the above-described embodiments. Similarly, the temperature control rolls 21 and the downstream air nozzles 22 disposed in the downstream drying chamber 20 may be disposed in different numbers or arrangement forms from those of the above-described embodiment.

Description of the reference symbols

1 … extraction drying device; 2 … extraction device; 3 … storage tank; 4 … reservoir drum; 5 … drying device; 6 … drying chamber; 10 … upstream side drying chamber; 11 … liquid removing device; 12 … liquid removal drum; 13 … upstream side air nozzle; 14 … circulation exhaust duct; 16 … temperature regulating roll; 16a … contact surface; 17 … upstream side blower; 18 … air supply path; 20 … downstream side drying chamber; 21 … temperature regulating roller; 22 … downstream side air nozzles; 23 … exhaust duct; 24 … exhaust blower; 25 … dampers; 26 … opening part; 27 … downstream side blower; 28 … air supply path; 30 … partition wall; 31 … communication part; 40 … intermediate roll seal arrangement; 41 … sealing the reel; 42 … sealing member; 45 … outlet side spool seal; 46 … sealing the reel; 47 … sealing member; 50 … control device; 51 … indoor sensor; 52 … outdoor sensors; 101 … extracting and drying device; f … film; MC … solvent; h … micro holes; LP … plasticizer; RLP … residual plasticizer; WA … wet air; DA … dry air; m … oil stain.

The claims (modification according to treaty clause 19)

(corrected) an extraction drying apparatus, characterized in that,

the disclosed device is provided with:

a storage tank for storing the liquid through which the membrane passes;

an upstream side drying chamber which communicates with the storage tank and through which the film in the liquid stored in the storage tank is transported;

a liquid removing device disposed in the upstream drying chamber, for removing the liquid adhering to the film conveyed in the upstream drying chamber;

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

a downstream side drying chamber disposed downstream of the upstream side drying chamber in a transport direction of the film;

a partition wall that partitions the upstream drying chamber and the downstream drying chamber and has a communication portion through which the film conveyed from the upstream drying chamber to the downstream drying chamber passes; and

and a downstream air nozzle disposed in the downstream drying chamber, and configured to blow a temperature-adjusted gas onto the film transported in the downstream drying chamber.

2. The extraction drying apparatus of claim 1,

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

3. The extraction drying apparatus according to claim 1 or 2,

a roll sealing device is disposed in the communication portion, and the roll sealing device includes:

a sealing roll for transporting the film from the upstream drying chamber side to the downstream drying chamber side; and

and a sealing member that faces a surface of the film conveyed by the sealing roll, the surface being opposite to a surface of the film facing the sealing roll.

4. The extraction drying apparatus according to any one of claims 1 to 3,

the liquid removing device includes a liquid removing roll for conveying the film while applying pressure to the film.

5. The extraction drying apparatus according to any one of claims 1 to 4,

the liquid removing device includes an upstream air nozzle for blowing the gas supplied from the upstream drying chamber to the film.

(deletion)

Claims

1. An extraction and drying device is characterized in that,

the disclosed device is provided with:

a storage tank for storing the liquid through which the membrane passes;

a partition wall that partitions the upstream drying chamber and the downstream drying chamber and has a communication portion through which the film transported from the upstream drying chamber to the downstream drying chamber passes; and

and a downstream air nozzle disposed in the downstream drying chamber, and configured to blow a temperature-adjusted gas to the film transported in the downstream drying chamber.

2. The extraction drying apparatus according to claim 1,

3. The extraction drying apparatus as set forth in claim 1 or 2,

4. The extraction drying apparatus according to any one of claims 1 to 3,

5. The extraction drying apparatus according to any one of claims 1 to 4,

6. The extraction drying apparatus according to any one of claims 1 to 5,

in the upstream side drying chamber, a temperature control roll is disposed which can convey the film by setting a temperature of a contact surface with the film to a temperature equal to or higher than a boiling point of the liquid.