JP2020177817A - Battery separator manufacturing system and manufacturing method - Google Patents

Abstract

To improve the efficiency of solidification of a coating film.SOLUTION: A battery separator manufacturing system (1) includes conveying rollers (R2 to R7) that are arranged on the non-coated surface side of a coating film in the solidified portion (30) and convey the coating film, and a nozzle (33) that is arranged in a region opposite to the conveying rollers (R2 to R7) with respect to the coating film (F) in a solidification portion (30) and is formed with an opening (33a) that supplies a poor solvent substance for solidifying the coating film.SELECTED DRAWING: Figure 2

Description

The present invention relates to a battery separator manufacturing system and manufacturing method.

Patent Document 1 describes (1) a coating liquid adjusting step of adjusting a coating liquid containing a polyvinylidene fluoride resin, and (2) a coating layer obtained by applying the coating liquid to a porous substrate. And (3) a coagulation step of bringing the coating layer into contact with a coagulating liquid to solidify the polyvinylidene fluoride resin to obtain a composite film having an adhesive porous layer, and (4). A film-forming method for forming an adhesive porous layer on a porous substrate by performing a washing step of washing the composite film with water and (5) a drying step of drying the composite film is disclosed. .. Further, in Patent Document 1, a stretching step may be provided before and after the washing step or the drying step for the purpose of controlling the area strength ratio of the β crystal-derived peak and the half width of the endothermic peak of the adhesive porous layer. Is disclosed.

Patent Document 2 describes (1) a configuration in which a coating film is formed on the upper surface of a strip-shaped base material and a gas is sprayed from the upper surface side to dry the coating film, and (2) the strip-shaped coating film is dried until the coating film is dried. A configuration in which a roller is arranged on the lower surface side of the base material is disclosed.

JP-A-2017-135111 (published on August 03, 2017) Republished Patent WO2015 / 194547 (International publication on December 23, 2015)

However, the above-mentioned conventional technique has a problem that the solidification of the coating film is inefficient.

An object of the present invention is to realize a manufacturing system and a manufacturing method of a battery separator in which the solidification of a coating film is efficient.

In order to solve the above problems, in the battery separator manufacturing system according to one aspect of the present invention, a coating liquid containing a resin is applied to a base material to form a coating film on the surface of the base material. The working part, the solidifying part for solidifying the coating film, the transport roller arranged on the non-coated surface side of the base material in the solidifying part and conveying the base material, and the solidifying part for the base material. The poor solvent substance supply unit is provided in a region opposite to the transport roller and has a supply port for supplying the poor solvent substance for solidifying the coating film. Is a substance that acts as a poor solvent with respect to the solid content of the coating film.

According to the above configuration, the poor solvent substance supplied from the supply port easily acts on the coating film, and efficient solidification is possible.

In the battery separator manufacturing system according to one aspect of the present invention, the supply port may have a shape flattened in the width direction of the base material. According to this configuration, it is possible to suppress variations in the solidification rate of the coating film in the width direction of the base material.

In the battery separator manufacturing system according to one aspect of the present invention, the poor solvent substance is supplied from the supply port, and the poor solvent substance flows more upstream than the downstream side in the transport direction of the base material. In addition, the above supply port may be arranged. According to this configuration, convection of the poor solvent substance on the coating film is further promoted, and efficient solidification is possible.

In the battery separator manufacturing system according to one aspect of the present invention, the solidified portion includes an exhaust portion in which an exhaust port is formed.
The exhaust port may be arranged on the downstream side of the supply port in the transport direction of the base material. According to this configuration, the poor solvent substance supplied from the supply port can be more evenly distributed in the solidified portion, and the variation in solidification can be suppressed.

In the battery separator manufacturing system according to one aspect of the present invention, the poor solvent substance is supplied from the supply port, and the supply direction of the poor solvent gas from the supply port is larger than the normal direction of the base material. The configuration may be close to the tangential direction. According to this configuration, the poor solvent substance supplied from the supply port can be more evenly distributed on the coated surface, and the variation in solidification can be suppressed.

In the battery separator manufacturing system according to one aspect of the present invention, the transport roller forms a convex transport path that projects toward the coated surface side of the base material, and the convex transport is performed in the solidified portion. It may be configured so that facing surfaces along at least a part of the route are configured. According to this configuration, more antisolvent substances supplied from the supply port act on the coating film, and efficient solidification is possible.

In order to solve the above problems, in the method for producing a battery separator according to another aspect of the present invention, a coating liquid containing a resin is applied to a base material to form a coating film on the surface of the base material. The coating process includes a coating step for solidifying the coating film and a solidification step for solidifying the coating film. In the solidification step, the substrate is conveyed by a transfer roller arranged on the non-coated surface side of the substrate. A poor solvent substance for solidifying the coating film is supplied to the region opposite to the transport roller with respect to the base material, and the poor solvent substance is poor with respect to the solid content of the coating film. A method that is a substance that acts as a solvent.

According to the above method, the supplied poor solvent substance easily acts on the coating film, and efficient solidification is possible.

According to one aspect of the present invention, the efficiency of solidification of the coating film can be improved.

It is a flow figure which illustrates the outline of the manufacturing process of the separator with a functional layer. FIG. 2A is a schematic diagram of a main part showing a part of a configuration example of a manufacturing system according to an embodiment of the present invention, and FIG. 2B is a normal line of FIG. 2A. It is sectional drawing of the opening of a coating film and a nozzle in. It is a block diagram which shows an example of the drive control of the drive roller in the manufacturing system shown in FIG. It is a schematic diagram of the main part which shows a part of the structural example of the manufacturing system which concerns on another Embodiment of this invention.

(Manufacturing flow of separator with functional layer)
The manufacturing flow of the separator with a functional layer will be described.

FIG. 1 is a flow chart illustrating an outline of a manufacturing process of a separator with a functional layer. The flow illustrated is a flow in which a totally aromatic polyamide (aramid resin) is used as a functional layer, and the total aromatic polyamide (aramid resin) is laminated on a polyolefin-based porous film as a base material. The functional layer containing the aramid resin functions as a heat-resistant layer of the separator with a heat-resistant layer.

The manufacturing process of the heat-resistant separator having a functional layer made of aramid resin includes each of the steps (a) to (f).

That is, in order, (a) a separator (film) unwinding step as a base material, (b) a coating solution (functional material) coating step, (c) a solidification step by humidification or the like, (d) a cleaning step, ( e) A drying step and (f) a winding step are included. Further, in addition to the above (a) to (f), a base material manufacturing (deposition) step is provided before the (a) unwinding step, and a slit step is provided before or after the (g) winding step. In some cases.

Hereinafter, (b) and (c) will be described.

(B) Coating process of coating liquid This is a step of applying the coating liquid to the base material (film) unwound in (a) to form a coating film on the surface of the base material. A coating film is obtained by this step.

Specifically, an NMP (N-methyl-pyrrolidone) solution of aramid is applied to the base material as a coating solution for the functional layer. The functional layer is not limited to the above-mentioned aramid coat layer. For example, as a coating liquid for a functional layer, a coating liquid containing an inorganic filler (such as a coating liquid containing alumina, a polyvinylidene fluoride-hexafluoropropylene copolymer and NMP (N-methyl-pyrrolidone)) is applied. You may work.

The method of applying the coating liquid to the base material is not particularly limited as long as it can be uniformly wet-coated, and various methods can be adopted. For example, a capillary coating method, a slit die coating method, a spray coating method, a dip coating method, a roller coating method, a screen printing method, a flexographic printing method, a gravure coating method, a bar coating method, a die coating method and the like can be adopted.

The thickness of the functional layer can be controlled by adjusting the thickness of the coating film or the solid content concentration in the coating film.

The functional layer may be provided on only one side of the base material or on both sides.

(C) Solidification step The solidification step is a step of solidifying the coating film formed in (b). When the coating liquid is an NMP solution of aramid, the proportion of water in the coating film can be increased, for example, by giving water vapor to the coating film. As a result, the solvent of the coating film becomes poorer than that of the aramid, so that the aramid is precipitated from the coating film and the coating film is solidified.

One of the uses of such a separator with a functional layer is a battery separator.

In the following, (b) and (c) will be described in detail.

[Embodiment 1]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2 to 3.

FIG. 2A is a schematic diagram of a main part showing a part of a configuration example of the manufacturing system 1 according to the first embodiment of the present invention, and FIG. 2B is the method of FIG. 2A. It is sectional drawing of the coating film F and the opening 33a of a nozzle 33 at line N.

As shown in FIG. 2A, in the manufacturing system 1 (manufacturing method), a coating liquid is applied to the film f to form a coating film on the surface of the film f to obtain a coating film F. The coating unit 20 (coating process) is included. As described above, the coating unit 20 is not particularly limited as long as it can uniformly wet-coat the coating liquid on the base material, and various methods can be adopted.

Further, the manufacturing system 1 includes a solidification unit 30 (solidification step) for solidifying the coating film of the coating film F. The solidifying unit 30 will be described in detail later.

In addition, the manufacturing system 1 includes a transport device that transports the objects to be transported (film f and coating film F) across the coating unit 20, the solidification unit 30, and other process units. The transfer device includes a plurality of transfer rollers including transfer rollers R1 to R7, a plurality of expander rollers including expander rollers E1 and E2, and a first drive roller D1 and a solidification section 30 on the upstream side of the solidification section 30. It includes a plurality of drive rollers including a second drive roller D2 on the downstream side, and a drive mechanism for driving each drive roller. The first drive roller D1 is the drive roller closest to the solidifying unit 30 when the transport device includes a plurality of driving rollers on the upstream side of the solidifying unit 30. The second drive roller D2 is the drive roller closest to the solidification unit 30 when the transport device includes a plurality of drive rollers on the downstream side of the solidification unit 30.

The "expander roller" in the present specification is a roller having a function of expanding and widening the transported object, and by using this as a transport roller of the transported object, wrinkles are generated in the transported object. Can be prevented. Moreover, even if a small amount of wrinkles occur, the wrinkles can be smoothed out.

The "drive roller" in the present specification is a roller having a function of driving the transportation of an object to be transported, and a rotating shaft is connected to a drive mechanism including a power source such as a motor. Further, by adjusting the peripheral speed of the drive roller, the tension and / or the stretching ratio of the coating film F to be conveyed in the conveying direction can be adjusted.

Further, in the manufacturing system 1, the first tension measuring unit 13 (tension measuring step) for measuring the tension in the transport direction of the transported object by the first drive roller D1 and the transport direction of the transported object by the second drive roller D2 It includes a second tension measuring unit 14 (tension measuring step) for measuring tension. The first tension measuring unit 13 is located between the first drive roller D1 and the roller located immediately before the first drive roller D1 among the plurality of transfer rollers and the plurality of expander rollers included in the transfer device. The second tension measuring unit 14 is located between the second drive roller D2 and the roller located immediately before the second drive roller D2 among the plurality of transfer rollers and the plurality of expander rollers included in the transfer device. To do. In the example shown in FIG. 2, the first tension measuring unit 13 is located between the first driving roller D1 and the expander roller E1 immediately before the first tension measuring unit 13, and the second tension measuring unit 14 is the second driving roller D2. It is located between the transfer roller R8 immediately before that.

Further, the manufacturing system 1 is installed in a clean room where the temperature and humidity are adjusted by the air conditioner 12 (humidity control device, humidity control process). Therefore, the temperature and humidity outside the solidification unit 30 are substantially maintained at the temperature and humidity adjusted by the air conditioner 12.

(Solidification part)
As shown in FIG. 2A, the solidifying portion 30 includes a housing 31 provided with a slit-shaped inlet 31a and an outlet 31b, and an exhaust portion formed with an exhaust port 32 for discharging air in the housing 31. A nozzle 33 (poor solvent substance supply unit) having an opening 33a (supply port) for supplying the poor solvent substance is provided in the housing 31.

As used herein, the term "poor solvent substance" means a substance that acts as a poor solvent with respect to the solid content of the coating film as compared with the non-solid content of the coating film, regardless of whether it is a liquid or a gas. The poor solvent substance is (1) a gas containing a poor solvent for the solid content of the coating film as a dispersoid (so-called aerosol), or (2) a gas corresponding to the vaporized state of the poor solvent outside the housing 31. It is preferably a gas contained in a higher concentration than air. Further, one type of solvent may be used or a plurality of types of solvents may be used in combination as the poor solvent for the solid content of the coating film.

When the coating liquid is an NMP solution of aramid, water (H ₂ O) is used as a poor solvent for aramid, and the poor solvent substance has an absolute humidity (g / m ³ ) higher than that of mist or air outside the housing 31. Highly humid air is preferred. Such fog or humid air can be easily realized by heating liquid water to generate water vapor (gaseous water). Even in the clean room outside the housing 31, a certain degree of absolute humidity is maintained for the purpose of taking measures against static electricity. As an example, the air in the clean room outside the housing 31 is maintained at 25 degrees Celsius and 50% relative humidity by the air conditioner 12, and the antisolvent substance supplied inside the housing 31 is 50 degrees Celsius and 70% relative humidity. It is hot and humid air around%.

As used herein, "solvent" means a substance that is liquid at room temperature (20 degrees Celsius), unless otherwise stated. "Absolute humidity (g / m ³ )" means the mass of gaseous water (H ₂ O) contained in 1 cubic meter of air. "Relative humidity (%)" means the percentage of the actual water vapor pressure of the air to the saturated water vapor pressure of the air.

If the transport roller comes into contact with the coated surface of the coating film F in a state where the coating film is not solidified, the coating film is transferred to the transport roller and the coating film is damaged. Therefore, the transport roller R1 between the coating portion 20 and the solidifying portion 30, the transport rollers R2 to R7 in the housing 31, and the first drive roller D1 are arranged on the non-coated surface side of the coating film F. Has been done. It is preferable that the expander roller E2 and the second driving roller D2, which come into contact immediately after the coating film is solidified, are also arranged on the non-coated surface side of the coating film F.

When the coating film solidifies, the coating film tends to shrink. Therefore, in order to resist the shrinking force of the coating film, the transport rollers R2 to R7 in the solidifying portion 30 are stretched on the coating surface side of the coating film F. It is arranged so as to form a convex transport path to be discharged. With this arrangement, since the transport rollers R2 to R7 hold the coating film F, they can function as pressure rollers that pressurize the coating film F so as to resist shrinkage in the transport direction and the width direction. Further, although not shown, the convex transport path formed by the transport rollers R2 to R7 in the solidified portion may be convex upward or laterally.

The coating film solidifies as a result of precipitation of resin, which is a solid content in the coating film, while the coating film F passes through the solidifying portion 30. Therefore, the transport roller on the downstream side of the solidifying portion 30 such as the transport roller R8 can be arranged on the coating surface side of the coating film F. This is because the coating film is solidified, so that there is little risk of damage even if the transport roller R8 comes into contact with it.

The exhaust unit discharges the air inside the housing 31 from the exhaust port 32 so as to maintain the inside of the housing 31 at a negative pressure with respect to the outside of the housing 31. This prevents the poor solvent substance from leaking out of the housing 31 and solidifying the coating film in a portion other than the solidifying portion 30 (specifically, the coating portion 20). In addition, a good solvent such as NMP volatilized from the coating film can be recovered through the exhaust unit. The air in the housing 31 tends to leak from the outlet 31b rather than the inlet 31a following the coating film F. Therefore, the exhaust port 32 of the exhaust unit is provided closer to the outlet 31b than the inlet 31a. A plurality of exhaust ports 32 may be provided.

The opening 33a of the nozzle 33 is arranged in a region opposite to the transport rollers R2 to R7 with respect to the coating film F, that is, on the coating surface side of the coating film F. Therefore, since the nozzle 33 can directly spray the poor solvent substance onto the coating film, the poor solvent substance easily acts on the coating film, and the precipitation of the resin from the coating film becomes efficient. That is, the solidification of the coating film becomes efficient. Although not shown, nozzles may be additionally arranged on the non-coated surface side of the coating film F.

As shown in FIG. 2B, the opening 33a of the nozzle 33 has a flat shape in the width direction of the coating film F. As a result, the nozzle 33 can supply the poor solvent gas substantially uniformly in the width direction, so that it is possible to suppress variations in the deposition rate of the resin from the coating film in the width direction of the coating film F. That is, it is possible to suppress variations in the solidification rate of the coating film.

The nozzle 33 directs the opening 33a so that the poor solvent substance flows more upstream side than the downstream side in the transport direction of the coating film F. By blowing out the poor solvent substance so as to face each other toward the upstream, convection of the poor solvent substance on the coating surface (that is, on the coating film) of the coating film F is promoted, and the coating film is solidified. Be more efficient. In this case, the exhaust port 32 of the exhaust section is arranged so as to avoid a short circuit in order to uniformly distribute the poor solvent substance in the housing 31 and suppress the variation in solidification. Specifically, the exhaust port 32 of the exhaust portion is arranged on the downstream side in the transport direction of the coating film F with respect to the opening 33a of the nozzle 33.

In the nozzle 33, the direction in which the poor solvent substance is blown out from the opening 33a (supply direction) is in the direction of the tangent line T (tangential direction) rather than the direction of the normal line N (normal line direction) in the coating film F closest to the opening 33a. The opening 33a is directed so that it is close. As a result, the poor solvent substance supplied from the opening 33a can be more evenly distributed near the coating surface, and the variation in the precipitation of the resin from the coating film can be suppressed. That is, it is possible to suppress variations in the solidification of the coating film. Here, at one point of the transported object, the normal line N is a straight line passing through the point, orthogonal to the transport direction of the transported object at the point, and orthogonal to the width direction of the transported object at the point. Yes, the tangent line T is a straight line passing through the point and parallel to the transport direction of the object to be transported at the point. Although not shown, a wind direction adjusting portion may be provided in the housing 31 for the purpose of promoting convection of the antisolvent substance. The wind direction adjusting portion preferably includes a facing surface along at least a part of the convex transport path.

(Example of drive control of drive roller)
FIG. 3 is a block diagram showing an example of drive control of the drive rollers D1 and D2 in the manufacturing system 1 shown in FIG.

As shown in FIG. 3, for example, the manufacturing system 1 includes a control unit 50 (control process) that controls the behavior of the transfer device 40 (convey process). The control unit 50 includes a first tension measurement unit 13, a second tension measurement unit 14, a first motor M1 for driving the first drive roller D1, a second motor M2 for driving the second drive roller D2, and a drive control unit 16. (Drive control process) is provided.

The control unit 50 controls the tension in the transport direction and the stretch ratio in the transport direction of the coating film F between the first drive roller D1 and the second drive roller D2. In the present embodiment, since there is a solidifying unit 30 between the first driving roller D1 and the second driving roller D2, the control unit 50 controls the tension and the stretching ratio in the solidifying unit 30.

The drive control unit 16 is connected to the first tension measurement unit 13, the second tension measurement unit 14, the first motor M1, and the second motor M2. The drive control unit 16 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by the processor executing a program (software).

The drive control unit 16 inputs the measurement result of the first tension measurement unit 13 and the measurement result of the second tension measurement unit 14, and feedback-controls the rotation speeds of the motors M1 and M2 based on these measurement results. As a result, the drive control unit 16 controls the peripheral speed ratios of the drive rollers D1 and D2 to control the tension and the stretching ratio of the coating film F in the solidification unit 30 in the transport direction. Although not shown, the rotation speed of one of the motors M1 and M2 is fixed, and only the rotation speed of the other may be feedback-controlled by the drive control unit 16.

As shown in Table 1, the rotation speeds of the motors M1 and M2 are feedback-controlled so as to maintain the tension in the second tension measuring unit 14, and a separator with a functional layer (laminated separator) is used in the manufacturing system according to the present embodiment. Manufactured.

The “base material film thickness (μm)” shown in Table 1 is a value obtained by measuring and averaging the film thickness of the base material used in each example at a plurality of places other than the end portion. The tension (N / mm) shown in Table 1 is the tension measured by the second tension measuring unit 14. The stretch ratio (%) shown in Table 1 is a value obtained by dividing the peripheral speed of the second drive roller D2 by the peripheral speed of the first drive roller. The air permeability (s / 100 ml) shown in Table 1 is the air permeability of the obtained laminated separator.

(Comparative Example 1)
2200 g of N-methyl-2-pyrrolidone (NMP) and 151 g of calcium chloride powder were added to a 3 liter separable flask having a stirring blade, a thermometer, a nitrogen inflow pipe and a powder addition port. The contents of the separable flask were then heated to 100 degrees Celsius to completely dissolve the calcium chloride powder. Then, after cooling the contents of the separable flask to room temperature, 68.23 g of para-phenylenediamine was added to completely dissolve the contents. Then, 124.97 g of terephthalic acid dichloride was added to the separable flask, and the mixture was stirred at 20 degrees Celsius for 1 hour. This gave a 6 weight percent solution of poly (paraphenylene terephthalamide).

To 100 g of the obtained poly (paraphenylene terephthalamide) solution, 300 g of NMP was added to obtain a 1.5% by weight solution of poly (paraphenylene terephthalamide). Alumina C (manufactured by Nippon Aerosil Co., Ltd.) and 6 g of Advanced Alumina AA-03 (manufactured by Sumitomo Chemical Co., Ltd.) were added to the obtained 1.5 wt% solution, and the mixture was stirred for 240 minutes. Further, 0.73 g of calcium carbonate was added, and the mixture was stirred for 240 minutes to obtain a coating liquid.

By fixing a polyethylene porous film having a thickness of 13.5 μm on a PET (Polyethylene terephthalate) film having a thickness of 100 μm and applying the above coating liquid to the surface of the polyethylene porous film using a bar coater. , A coating film having a coating film formed on the surface of the polyethylene porous film was obtained. The obtained coating film was placed in an atmosphere of 50 ° C. and 70% relative humidity to precipitate poly (paraphenylene terephthalamide) (PPTA), and the coating film was solidified. The stretch ratio of the polyethylene porous film at the time of solidification was 0%, and the solidification time was 60 seconds. The coating film in which the coating film was solidified due to the precipitation of PPTA was immersed in ion-exchanged water. Then, it dried in the oven of 70 degreeC, and the laminated separator was obtained. The air permeability of the obtained laminated separator was 349 s / 100 ml.

(Example 1)
By applying the same coating liquid as in Comparative Example 1 to the surface of the polyethylene porous film conveyed by the conveying roller on the side opposite to the surface with which the conveying roller contacts, using a bar coater. A coating film having a coating film formed on the surface of the polyethylene porous film was obtained. Humid air at 50 ° C. and 70% relative humidity is applied to the surface of the film coating film conveyed by the transfer roller, which is the surface opposite to the surface on which the transfer roller contacts, on which the coating film is formed. By transporting the coating film while spraying, PPTA was precipitated and the coating film was solidified. The stretch ratio of the polyethylene porous film film at the time of solidification was 1.1%, and the passage time of the solidified atmosphere filled with the humid air was 4.5 seconds. The coating film whose coating film was solidified by solidifying PPTA was washed by immersing it in ion-exchanged water and then dried to obtain a laminated separator. The air permeability of the obtained laminated separator was 294 s / 100 ml.

(Example 2)
A laminated separator was obtained in the same procedure as in Example 1 except that the stretch ratio of the polyethylene porous film at the time of solidification was adjusted to 2.4% and the passage time of the solidification atmosphere was set to 5.0 seconds. The air permeability of the obtained laminated separator was 265 s / 100 ml.

(Example 3)
Same as in Example 1 except that the thickness of the polyethylene porous film was 12 μm, the stretch ratio of the polyethylene porous film at the time of solidification was adjusted to 6.0%, and the passage time of the solidified atmosphere was 5.0 seconds. A laminated separator was obtained by the above procedure. The air permeability of the obtained laminated separator was 272 s / 100 ml.

(Comparative Example 2)
A laminated separator was obtained in the same procedure as in Example 3 except that the stretch ratio of the polyethylene porous film at the time of solidification was adjusted to 7.0%. The air permeability of the obtained laminated separator was 273 s / 100 ml.

As shown in Table 1, in Comparative Example 1, the air permeability of the laminated separator, which is an index of ion permeability, exceeds 300 s / 100 ml, and it can be seen that the ion permeability is low. On the other hand, in Examples 1 to 3, the air permeability of the laminated separator is less than 300 s / ml, which is sufficiently low. Therefore, in order to make the air permeability of the laminated separator suitable, the length of the coating film F being transported in the solidified portion 30 in the transport direction is stretched by more than 0.5% as compared with the unconveyed state. Is preferable.

Further, in Comparative Example 1, it took 60 seconds to solidify the coating film, whereas in Examples 1 to 3, the solidification of the coating film was 5.0 seconds or less. Compared with Example 1, the coating film could be solidified more efficiently.

On the other hand, in Comparative Example 2, although the air permeability is as low as that in Example 3, the porous film is necked between the first drive roller D1 and the second drive roller D2 in the width direction of the coating film F. Woke up the inn. Therefore, in order to prevent the occurrence of neck-in and prevent the neck-in state from being maintained when the neck-in occurs, the length of the coating film F being conveyed in the solidifying portion 30 in the conveying direction. It is preferable that the drive control unit 16 controls the rotation speeds of the motors M1 and M2 so that the film is stretched by 6% or less as compared with the unconveyed state. By preventing neck-in, deterioration of manufacturing yield and bending of the battery separator can be suppressed.

Here, the "unconveyed state" means the state of the object to be transported on the downstream side of the first drive roller D1.
(Another example of drive control of drive rollers)
In addition or instead, the drive control unit 16 calculates the peripheral speed of the first drive roller D1 based on the diameter of the first drive roller D1 and the rotation speed of the first motor M1, and similarly, the second drive roller D2. The peripheral speed of the second drive roller D2 may be calculated with respect to the first drive roller D1. Then, the drive control unit 16 controls the peripheral speed ratios of the drive rollers D1 and D2 by feedback-controlling the rotation speeds of the motors M1 and M2 based on the peripheral speed ratio, and the coating film F in the solidification unit 30. The tension and stretching ratio in the transport direction can be controlled.

[Embodiment 2]
Other embodiments of the present invention will be described below. For convenience of explanation, the same reference numerals will be added to the members having the same functions as the members described in the above embodiment, and the description will not be repeated.

FIG. 4 is a schematic view of a main part showing a part of a configuration example of the manufacturing system 2 according to the second embodiment of the present invention.

As shown in FIG. 4, in the manufacturing system 2 according to the second embodiment, unlike the manufacturing system 1 according to the first embodiment, (i) the first drive roller D1 is coated together with the first tension measuring unit 13. It is arranged on the upstream side of the portion 20, and (ii) includes a solidifying portion 30A in place of the solidifying portion 30. Further, the transport device 40 further includes a transport roller R9 on the upstream side of the coating unit 20.

As a result, in the present embodiment, since the coating unit 20 and the solidifying unit 30A are located between the first driving roller D1 and the second driving roller D2, the drive control unit 16 is the coating unit 20 and the solidifying unit 30A. Tension and stretch ratio in. Therefore, the film f coated by the coating unit 20 is also under the control of the draw ratio by the drive control unit 16.

Further, as shown in FIG. 4, in the solidifying section 30A according to the second embodiment, unlike the solidifying section 30 according to the first embodiment, a plurality of nozzles 33 on the coated surface side are arranged. By arranging a plurality of nozzles 33 on the coating surface side, convection of the poor solvent substance on the coating surface (that is, on the coating film) of the coating film F is promoted, and the solidification of the coating film becomes more efficient. .. Further, a nozzle 35 on the non-coated surface side is also arranged.

The manufacturing system 2 according to the second embodiment may include the solidifying section 30 according to the above-described first embodiment instead of the solidifying section 30A according to the second embodiment. The manufacturing system 1 according to the first embodiment may include the solidifying unit 30A according to the second embodiment instead of the solidifying unit 30 according to the first embodiment.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

1, 2, manufacturing system (manufacturing method)
12 Air conditioner (humidity control device, humidity control process)
13 First tension measurement unit (tension measurement unit, tension measurement process)
14 Second tension measurement unit (tension measurement unit, tension measurement process)
16 Drive control unit 20 Coating unit (coating process)
30, 30A, 30B, 30C solidification part (solidification process)
32 Exhaust port 33 Nozzle (poor solvent supply unit)
33a Aperture 40 Conveyor device (conveyance process)
50 Control unit (control process)
D1 1st drive roller (drive roller)
D2 2nd drive roller (drive roller)
f film (base material)
F Coating film R1, R8, R9 Conveying roller R2 to R7 Conveying roller (pressurized roller)

Claims (7)

A coating portion that coats a base material with a coating liquid containing a resin to form a coating film on the surface of the base material, and a coating portion.
The solidified part that solidifies the coating film and
A transport roller that is arranged on the non-coated surface side of the base material in the solidified portion and conveys the base material, and
In the solidification section, the poor solvent substance supply section is arranged in a region opposite to the transport roller with respect to the base material, and a supply port for supplying the poor solvent substance for solidifying the coating film is formed. Is equipped with
The poor solvent substance is a manufacturing system for a battery separator, which is a substance that acts as a poor solvent with respect to the solid content of the coating film. The battery separator manufacturing system according to claim 1, wherein the supply port has a flat shape in the width direction of the base material. The poor solvent substance is supplied from the supply port,
The battery separator manufacturing system according to claim 1 or 2, wherein the supply port is arranged so that the poor solvent substance flows more upstream side than the downstream side in the transport direction of the base material. The solidified portion includes an exhaust portion in which an exhaust port is formed.
The battery separator manufacturing system according to claim 3, wherein the exhaust port is arranged on the downstream side of the supply port in the transport direction of the base material. The poor solvent substance is supplied from the supply port,
The battery separator manufacturing system according to any one of claims 1 to 4, wherein the supply direction of the poor solvent substance from the supply port is closer to the tangential direction than the normal direction of the base material. The transport roller forms a convex transport path that projects toward the coated surface side of the base material.
The battery separator manufacturing system according to any one of claims 1 to 5, wherein a facing surface along at least a part of the convex transport path is formed in the solidified portion. A coating process in which a coating liquid containing a resin is applied to a base material to form a coating film on the surface of the base material.
It includes a solidification step of solidifying the coating film.
In the above solidification process
The base material is conveyed by a transfer roller arranged on the non-coated surface side of the base material.
A poor solvent substance for solidifying the coating film was supplied to the region of the base material opposite to the transport roller.
The poor solvent substance is a method for producing a battery separator, which is a substance that acts as a poor solvent with respect to the solid content of the coating film.

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