JP6876571B2 - Separator manufacturing system for LIB - Google Patents

Description

The present invention relates to a separator manufacturing system for LIB, and in particular, an in-line coater is provided between an extractor and a transverse stretching machine.

A polyolefin-based material is used as a separator for this type of lithium-ion battery (hereinafter referred to as LIB) that has been conventionally used, and as a measure for improving the heat resistance of this separator, an organic material or an inorganic material is applied to the surface thereof. The technique of coating is known.
As the inorganic material, mainly fine particles of ceramics such as alumina and silica are mixed with a slurry-like liquid in which an organic substance for adhesion is mixed with an aqueous or organic solvent and coated on the surface of the separator to generate heat resistance. Improved properties (disclosed in Patent Document 1 Separator for non-aqueous secondary batteries, Slurry for secondary battery porous membranes in Patent Document 2, Porous membranes for secondary batteries and methods for producing them, and applications). ..

In addition, as an organic material, polyamide, polyimide, etc. are coated on a separator alone or mixed with an inorganic material while also acting as a binder to improve heat resistance (patented). Document 3 Non-aqueous secondary battery separator, its manufacturing method and non-aqueous secondary battery, Patent Document 4 Non-aqueous secondary battery separator polyolefin microporous membrane base material, its manufacturing method, non-aqueous secondary battery separator and Disclosure to non-aqueous secondary batteries).

The above-mentioned coating liquid is applied to the separator using a so-called coater (slurry for forming an insulating layer of Patent Document 5, a separator for a lithium ion secondary battery and a method for producing the same, and a lithium ion secondary battery, ), Slit die coaters, gravure coaters, etc. are generally used.
However, it is common sense that the coater winds up the separator once manufactured, then sets it on a batch type coater, and applies the coating liquid to the surface of the separator.

On the other hand, stretched polyethylene terephthalate (PET) films used for optics have been provided with an adhesive coater in the PET film manufacturing system for attaching fine particles for light scattering and prisms for condensing light. A system is used (a film for a lens sheet of Patent Document 6, a laminated biaxially stretched polyester film for optics of Patent Document 7, and a hard coat film using the same).

Japanese Unexamined Patent Publication No. 2013-114751 Japanese Unexamined Patent Publication No. 2014-203680 Japanese Unexamined Patent Publication No. 2009-21265 Japanese Patent No. 4460028 Japanese Unexamined Patent Publication No. 2011-18588 Japanese Unexamined Patent Publication No. 2000-141574 Japanese Unexamined Patent Publication No. 2007-2535112

Since the above-mentioned LIB separator manufacturing system is configured as described above, the following problems exist.
That is, when the surface of the conventional separator for LIB is coated with ceramic fine particles, the configuration thereof is as shown in FIGS. 10 and 11, and the wet separator manufacturing system 1 in FIG. 10 and the offline coater 8 in FIG. 11 are configured. It is composed of and.
In FIG. 10, in the wet separator manufacturing system 1, the extruder 2, the cast roll 3, the longitudinal stretching machine 4, the first transverse stretching machine 5, and the extracting machine 6 are sequentially arranged from the upstream side 9 to the downstream side 10. And the second transverse stretching machine 7, and the downstream side 10 of the second transverse stretching machine 7 or another place is not an in-line configuration but an offline configuration that enters the line of the wet separator manufacturing system 1. Another independent offline coater 8 is provided.

The specific configuration of the offline coater 8 is shown in FIG.
That is, the separator film 22 sent out from the unwinding portion 21 is coated with the solution mixed with the ceramic fine particles by the coater head 20, and then the first, second, and third dryers 23, 24, 25. After that, the sheet-shaped separator 22A for LIB is wound by the winding unit 26 to complete the separator.

Until now, since the ceramic coating was performed only on a part of the separators, the ceramic coating was performed by setting the separator film once wound up in the extruder again. For this reason, mechanically, the coater always required a dryer consisting of a plurality of dryers, and at the same time, it had to have an offline configuration separated from the separator manufacturing system.
Further, considering the manufacturing process, if the coater is incorporated into the separator manufacturing system of FIG. 10, it is generally considered that the coater is after the extractor and before the second transverse stretching machine TD2, but in TD2, it is compatible with the extractor. By extracting the agent, the microporous required for the separator is blocked by shrinkage. Therefore, in general, the pore size is adjusted by re-stretching laterally about 1.1 to 1.5 times, and appropriate heat fixation is performed. (Suppresses shrinkage at high temperatures by applying heat) is required. Since such a process is performed, when the ceramic fine particles are applied, there is a problem that the necessary adhesiveness cannot be maintained and the ceramic fine particles are peeled off.
Further, since it is necessary to install the separator manufacturing system and the offline coater in FIG. 10 separately, the installation area becomes large, which is a big obstacle to the modernization of the factory where space saving is progressing.

The present invention has been made to solve the above problems, and in particular, a system in which a coater is incorporated as an in-line in a separator manufacturing system, which is difficult both mechanically and in terms of manufacturing process, and makes it possible. It is an object of the present invention to provide a manufacturing method.

The LIB separator manufacturing system according to the present invention is a LIB separator manufacturing system in which a film from an extruder is longitudinally stretched and then stretched by a transverse stretching machine via an extractor. An in-line coater is arranged between the two, and a slurry-like coating liquid obtained by mixing ceramic fine particles with an aqueous solvent or an organic solvent is applied onto the film by the in-line coater to obtain a separator for LIB. The ceramic fine particles have a quadrangle of 10 μm ≤ average particle diameter ≤ 400 μm or a configuration having three or more cross sections, and the in-line coater includes a gravure roll, a doctor chamber, and an insert. It is composed of a side near roll, an exit side near roll, and a plurality of guide rolls, and the positional relationship between the gravure roll and each of the near rolls is 0 ° ≤ θ ≤ 150 °. Is a configuration in which a drying function is not provided, and the gravure roll has a quadrangular weir including a rhombus formed on its surface in a regular arrangement, and the angle θ of the vertical line of the quadrangle is the gravure roll. 0 ° ≤ θ <90 ° with respect to the direction of rotation, the ratio of the short side to the long side is 0 <L ≤ 1, the height H of the groove wall is 0 μm <H ≤ 1 mm, and the surface. The film has 0 <N ≦ 500 weirs in 1 inch, and the ratio of the rotation speed of the gravure roll to the transport speed L of the film is in the range of 0 ≦ G / L ≦ 10. The separator is coated and dried, and the temperature and air volume of the separator are adjusted so that the amount of heat given to the film in the preheating step is 1.5 kW / h or less, and the coating liquid is applied. The dry amount of the remaining coating liquid is suppressed to 20% or less, and the temperature and air volume are adjusted so that the amount of heat given to the film is 1.2 kW / h or less in the subsequent transverse stretching step. Is configured to be able to be suppressed to 20% or less.

Since the separator manufacturing system for LIB according to the present invention is configured as described above, the following effects can be obtained.
That is, in a separator manufacturing system for LIB in which a film from an extruder is longitudinally stretched and then stretched by a transverse stretcher via an extractor, an in-line coater is arranged between the extractor and the transverse stretcher. Then, a slurry-like coating liquid obtained by mixing the ceramic fine particles with an aqueous solvent or an organic solvent was applied onto the film by the in-line coater to obtain a separator for LIB. By in-line the coater in the separator manufacturing system, the production of highly heat-resistant separators by coating ceramic fine particles on the separator for LIB, which was previously possible only offline, can be reduced in cost and the separator can be manufactured. By simultaneously coating the ceramic fine particles, the manufacturing productivity of the highly heat-resistant separator can be dramatically improved as compared with the conventional case.
Further, the ceramic fine particles have a spherical shape with an average particle diameter of 10 μm ≦ 400 μm or a structure having three or more cross sections, so that the adhesiveness to the film is improved.
Further, since the in-line coater is composed of a gravure roll, a doctor chamber, an entry side near roll, an exit side near roll, and a plurality of guide rolls, the configuration as an in-line coater is miniaturized. It is easy to dispose between.
Further, since the positional relationship between the gravure roll and each near roll is 0 ° ≤ θ ≤ 150 °, the optimum position at the time of coating can be selected.
Further, since the gravure coater is not provided with the drying function, the dryer of the transverse stretching machine can be used as the dryer for drying, which can greatly contribute to the miniaturization of the gravure coater.
Further, in the gravure roll, a quadrangular weir including a rhombus is formed on the surface thereof in a regular arrangement, and the angle θ of the vertical line of the quadrangle is 0 ° ≤ θ <90 ° with respect to the rotation direction of the gravure roll. The ratio of the short side to the long side is 0 <L ≦ 1, the height H of the groove wall is 0 μm <H ≦ 1 mm, and 0 weirs on the surface <N ≦ 500 in 1 inch. By having the individual pieces, the above-mentioned angle, height and number can be freely changed according to the type and the like of the coating material to be coated on the film, and the optimum coating can be performed on the film.
Further, the coating thickness is increased by coating the film and drying it in a range where the ratio of the rotation speed of the gravure roll to the transport speed L of the film is in the range of 0 ≦ G / L ≦ 10. It can be changed freely.
Further, the separator 22A is adjusted in temperature and air volume so that the amount of heat given to the film in the preheating step is 1.5 kW / h or less to suppress the drying amount of the coating liquid to 20% or less, and then. In the transverse stretching step of the above, the temperature and the air volume were adjusted so that the amount of heat given to the film was 1.2 kW / h or less, and the dry amount of the remaining coating liquid could be suppressed to 20% or less. Thereby, the adhesiveness and cracks on the surface of the separator can be adjusted.

It is a schematic block diagram which shows the separator manufacturing system for LIB by this invention. It is a concrete block diagram of the in-line coater of FIG. It is a schematic block diagram which shows the in-line easy-adhesive coating method for BOPET in another form of FIG. It is a schematic block diagram which shows the in-line ceramics coating method for a separator in another form of FIG. It is a block diagram of the demonstration apparatus of the separator manufacturing system for LIB by this invention. It is a schematic block diagram which shows the main part of the demonstration apparatus of FIG. It is explanatory drawing which shows the coating thickness adjustment condition in the in-line coater of FIG. It is explanatory drawing which shows the lateral stretching / drying condition for an in-line coater of FIG. It is explanatory drawing of the peel strength measurement test with respect to the separator in this invention. It is a schematic block diagram which shows the conventional offline type separator manufacturing system for LIB. It is a schematic block diagram which shows the conventional offline type offline coater.

Regarding the separator manufacturing system for LIB according to the present invention, in particular, an in-line coater is provided between the extractor and the transverse stretching machine.

Hereinafter, preferred embodiments of the separator manufacturing system for LIB according to the present invention will be described together with the drawings.
The same or equivalent parts as those of the conventional example will be described using the same reference numerals.
In FIG. 1, what is indicated by reference numeral 1 is a wet separator manufacturing system having an extruder 2 on the upstream side 9, and the film 22 extruded from the die 2A of the extruder 2 toward the downstream side 10 is vertically formed. After being stretched by the stretcher 4 and the first transverse stretcher (TD1) 5, it is supplied to the extractor 6.

In the extractor 6, after the impurity extraction treatment such as cleaning is performed, a slurry formed by mixing ceramic fine particles with an aqueous solvent or an organic solvent on the film 22 by an in-line coater 8A on the downstream side. The shape of the coating liquid is applied to form the separator 22A. The sheet-shaped separator 22A sent from the inline coater 8A to the downstream side 10 is stretched in width by a second transverse stretching machine (TD2) 7 arranged immediately after the inline coater 8A, and the winding mechanism 23 It is configured to be wound up by.
The ceramic fine particles are formed so as to have a spherical shape with 10 μm <average particle diameter ≦ 400 μm or three or more cross sections.

The inline coater 8A is configured as shown in FIG.
The film 22 extracted by the extractor 6 passes through a plurality of guide rolls 24 to the gravure roll 26 of the doctor chamber 25 and a pair of entry sides located outside the gravure roll 26 in the vicinity of the gravure roll 26. It is configured to be sent to the second transverse stretching machine 7 as a sheet-shaped separator 22A after the above-mentioned coating is performed through the exit side near rolls 27 and 28. The gravure roll 26 has a mechanism for self-rotating one gravure roll 26 (not shown).

The positional relationship between the gravure roll 26 and each of the near rolls 27 and 28 is configured to be variable to 0 ° ≤ θ ≤ 150 ° by a variable mechanism (not shown).
As shown in FIG. 2, the gravure pattern 26A of the gravure roll 26 has a quadrangular weir 40 including a rhombus engraved on its surface in a regular arrangement, and the angle θ of the vertical line of the quadrangle (FIG. 2). In 2, θ is 45 °), but 0 ° ≤ θ90 ° with respect to the rotation direction R of the gravure roll 26, the ratio of the short side to the long side is 0 <L ≤ 1, and the height of the groove wall. The diameter is 0 μm <H ≦ 1 mm, and the number of the dams 40 is 0 <N ≦ 500 in 1 inch.
The in-line coater (gravure coater) 8A does not have the drying function (dryer) of the conventional offline coater 8 only for drying, and also uses the drying function of the second transverse stretching machine 7.

Next, a case where the separator 22A is manufactured by using the in-line coater 8A of the wet separator manufacturing system 1 of FIG. 1 will be described.
In the in-line coater system shown in FIG. 1, the drying furnace required for the offline coater shown in FIG. 10 is omitted because it is also used for the drying function of TD2 in the separator manufacturing system, that is, the second transverse stretching machine 7. Further, since the feeding and winding mechanism 23 is also used in the system, only the in-line coater 8A having the gravure head is arranged after the extractor 6 in the separator manufacturing system 1 and before the TD2, that is, the second transverse stretching machine 7. It will be a system consisting of the above configurations.

Next, the ceramic coating method in the in-line coating system for LIB shown in FIG. 1 will be described.
FIG. 3 shows an example of a coating method used for a conventional well-known BOPET (Bioxially-Oriented Polyethylene terephthalate) or the like. As the adhesive, about 10 wt% of polyurethane resin, acrylic resin, etc. is coated on the film 22 of about 4 μm before lateral stretching in a state where the coating liquid dissolved in about 90 wt% of water contains water. In the preheating step in the transverse stretching machine 7, water is evaporated from this liquid and then stretched about 4 times to finally obtain a state in which a thickness of about 1 μm is laminated in the form of a BOPET film. Since polyurethane resin and acrylic resin are in a glue-like state, even if the film is stretched, it is stretched together with the film in a stuck state.
On the other hand, in order to manufacture a separator coated with ceramics by the in-line coating system, for example, TD2, that is, the ceramic fine particles glued in the second transverse stretching machine 7 are placed on the film 22. It is necessary to stretch it laterally about 1.1 to 1.5 times. In this case, it is necessary to apply the coating so that the ceramics do not peel and crack during the film stretching. Therefore, it is necessary to apply and dry by a method different from the conventional in-line coating method of the adhesive, and an example of this is shown in FIG. Generally, a coating liquid containing ceramic fine particles is an adhesive in which about 30 to 40 wt% of ceramic fine particles and 60 to 70 wt% of other ceramic fine particles are dissolved in water, and after drying, the ceramic fine particles are evenly placed on the glue. It needs to be in a state. Therefore, unlike the one for BOPET, in the preheating zone 30, the water is first passed through the stretching zone 31 in a moist state without being dried too much, and after stretching, the coating liquid is dried and the film is heat-fixed to peel off. It is possible to apply without cracking. However, in this stretching / drying step, it is necessary to change the treatment conditions according to the requirements such as the type of film 22 and the coating thickness.
In the above case, for the heat-resistant separator, the solvent is about 60 wt% in an aqueous system, the alumina is about 40 wt%, and the solvent is stretched and dried by the transverse stretching machine 7. In the drying step of the separator 22A, when the separator 22A is dried, first, a solution of 10% or less is dried, and in the subsequent stretching, the remaining solution is dried by adjusting the air volume and the calorific value. It is configured in. Further, the separator 22A is adjusted in temperature and air volume so that the amount of heat given to the film in the preheating step is 1.5 kW / h or less to suppress the drying amount of the coating liquid to 20% or less, and then. In the transverse stretching step of the above, the temperature and air volume can be adjusted so that the amount of heat given to the film is 1.2 kW / h or less, and the dry amount of the remaining coating liquid can be suppressed to 20% or less. ..

Hereinafter, an example of the separator manufacturing system for LIB according to the present invention will be described with reference to the drawings. In addition, each physical property value obtained by the present invention is a value obtained by the method shown below.
Surface observation: The prepared sheet was subjected to platinum vapor deposition with a thickness of 0.3 nm using a vacuum vapor deposition apparatus (E-1045 manufactured by Hitachi High-Tech). The surface of this sheet was observed using FE-SEM (SUPRA55VP manufactured by Carl Zeiss).
Peeling strength: Performed in accordance with JIS6854-1 using Autograph (AG / 20kNG manufactured by Shimadzu Corporation).
(Example 1)
For coating, a simple coating / stretching experiment was performed using the devices shown in FIGS. 5 and 6. As the film 22, a commercially available polyethylene film (LL-XMTM) manufactured by Futamura Chemical Co., Ltd. was used as a substitute for the separator film. BM-2000M manufactured by Zeon Corporation was used as the coating ceramic.
Further, in order to make the coating thickness condition of the ceramics constant, as shown in FIG. 7, the rotation speed G and the film transfer speed (= line speed) L of the gravure roll 26 of the inline coater 8A are set to 0 ≦ G / L. The transport speed was limited to 6 m / min and the G / L ratio = 2 as a condition for stably and uniformly coating on the film 22 by controlling in the range of ≦ 10. Of the 10 zones of the transverse stretching machine shown in FIG. 8, the film coated under these conditions is shown in Table 1 with the first zone at the entrance as the preheating section, the second zone as the stretching section, and the remaining 8 zones as the heat fixing section. The conditions shown in Example 1 were set, and the film was stretched 1.2 times at the stretched portion.

(Example 2)
The experiment was conducted under the same conditions as in Example 1 and the film transport speed was 12 m / min under the conditions shown in Example 2 in Table 1.
(Example 3)
The experiment was conducted under the same conditions as in Example 1 and the film transport speed was 16 m / min under the conditions shown in Example 3 in Table 1.
(Example 4)
The experiment was conducted under the same conditions as in Example 1 and the film transport speed was 20 m / min under the conditions shown in Example 4 in Table 1.
(Example 5)
The experiment was conducted under the same conditions as in Example 1 and the film transport speed was 24 m / min under the conditions shown in Example 5 in Table 1.
(Comparative Example 1)
Of the 10 zones of the transverse stretching machine shown in FIG. 8, the second zone at the entrance is a preheating section, the third zone is a stretching section, and the remaining four zones are heat fixing sections, which are shown in Example 1 of Table 1 above. The conditions were set, and the other experiments were conducted under the same conditions as in Example 1.
(Comparative Example 2)
Of the 10 zones of the transverse stretching machine shown in FIG. 8, the second zone at the entrance is the preheating section, the third zone is the stretching section, and the remaining four zones are the heat fixing sections, which are the same conditions as in Example 2 of Table 1 described above. I experimented with.

Results comparison The results are shown in Table 2, and in the SEM photographs under the conditions of Examples 1 to 2 and 3, it is observed that the coated ceramics are partially cracked due to film stretching. This is the same phenomenon as in Comparative Examples 1 and 2, but when the separator is coated with ceramics, the stretching / drying method shown in FIG. 4 is required, and the amount of heat given to the preheated portion and the stretched portion is large. It is considered that the cause is that it is supposed to be stretched after the water is removed.
Comparing Examples 1 to 3, the state of cracks tends to be improved and the peel strength tends to be improved as the amount of heat given to the preheated portion and the stretched portion is reduced. Further, looking at the results of Examples 4 and 5, no cracks were observed in the SEM image, and the peel strength was further improved as compared with Examples 1 to 3.
As a reference example, Table 2 shows the results of coating the separator offline under the optimum conditions as shown in FIG. 10, but when this and Examples 4 and 5 are compared, the SEM images are almost the same. Since the peel strength showed a value equal to or higher than that, it can be said that mechanical properties equal to or higher than those of offline can be obtained by optimizing the calorific value and stretching conditions of the preheated portion and the stretched portion.
Further, FIG. 9 shows an outline of a test for measuring the peel strength of the separator 22A, in which a low adhesive tape 52 is attached to a coating film 51 on the separator 22A on the table 50 and a load cell 53 is provided. The coating film 51 is connected to the tool 54 via the low adhesive tape 52, and the maximum load of the jig 54 is measured as the peel strength.

Next, the gist of the separator manufacturing system for LIB according to the present invention is as follows.
That is, in a separator manufacturing system for LIB in which the film 22 from the extruder 2 is vertically stretched and then stretched by the transverse stretching machine 7 via the extracting machine 6, between the extracting machine 6 and the transverse stretching machine 7. An in-line coater 8A is arranged in the film 22, and a slurry-like coating liquid prepared by mixing ceramic fine particles with an aqueous solvent or an organic solvent is applied onto the film 22 by the in-line coater 8A, and a separator for LIB is applied. It is a separator manufacturing system for LIB characterized by being configured to obtain 22A, and the ceramic fine particles are characterized by having a spherical shape of 10 μm ≤ average particle diameter ≤ 400 μm or a configuration having three or more cross sections. The LIB separator manufacturing system according to claim 1, wherein the in-line coater 8A includes a gravure roll 26, a doctor chamber 25, an entry side near roll 27, an exit side near roll 28, and a plurality of guide rolls 24. The LIB separator manufacturing system according to claim 1 or 2, wherein the positional relationship between the gravure roll 26 and the near rolls 27 and 28 is 0 ° ≤ θ ≤ 150 °. The LIB separator manufacturing system according to claim 3, and the LIB separator manufacturing system according to claim 3 or 4, wherein the in-line coater 8A is not provided with a drying function. In the gravure roll 26, square dams 40 including a rhombus are formed on the surface 26a in a regular arrangement, and the angle θ of the vertical line of the square is 0 ° ≦ with respect to the rotation direction R of the gravure roll 26. When θ <90 °, the ratio of the short side to the long side is 0 <L ≦ 1, the height H of the groove wall is 0 μm <H ≦ 1 mm, and the weir 40 on the surface 26a is in 1 inch. The LIB separator manufacturing system according to any one of claims 3, 4, and 5, wherein the system has 0 pieces <N ≦ 500 pieces, and the rotation speed of the gravure roll 26 and the film 22. Any one of claims 3, 4, 5, and 6 characterized in that the film 22 is coated and dried in a range of 0 ≦ G / L ≦ 10 in the ratio of the transport speed L. The LIB separator manufacturing system according to the above item, and the separator 22A dries the coating liquid by adjusting the temperature and air volume so that the amount of heat given to the film in the preheating step is 1.5 kW / h or less. The amount is suppressed to 20% or less, and the fill is added in the subsequent transverse stretching step. The claim is characterized in that the temperature and air volume are adjusted so that the amount of heat given to the system is 1.2 kW / h or less, and the dry amount of the remaining coating liquid can be suppressed to 20% or less. Item 2. The separator system for LIB according to any one of Items 1 to 7.

In the separator manufacturing system for LIB according to the present invention, since an in-line coater is provided between the extractor and the transverse stretching machine, the drying furnace required for the offline coater can also be used as that of the transverse stretching machine, so that it can be omitted. , High heat resistance separator and ceramic coating can be performed at the same time, and the manufacturing productivity can be greatly improved.

1 Wet separator manufacturing system 2 Extruder 2A Die 3 Cast roll (CR)
4 Longitudinal stretching machine (MDO)
5 First transverse stretching machine (TD1)
6 Extractor 7 Second transverse stretching machine (TD2)
(Transverse / Direction / Orientation)
(Drying / heat fixing zone)
8A Inline Coater (ILC)
9 Upstream side 10 Downstream side 22 Film 22A Sheet-shaped separator 23 Winding mechanism (take-up unit / winder)
24 Guide roll 25 Doctor chamber 26 Gravure roll 26A Gravure pattern 27 Enter side near roll 28 Exit side near roll 30 Preheating zone 31 Stretch zone 40 Weir R Rotation direction H Height

Claims (8)

In a separator manufacturing system for LIB in which a film (22) from an extruder (2) is vertically stretched and then stretched by a transverse stretcher (7) via an extractor (6).
An in-line coater (8A) is arranged between the extractor (6) and the transverse stretching machine (7), and a slurry-like coating liquid prepared by mixing ceramic fine particles with an aqueous solvent or an organic solvent is applied. A separator manufacturing system for LIB, which is configured to obtain a separator (22A) for LIB by coating on the film (22) with the in-line coater (8A). The separator manufacturing system for LIB according to claim 1, wherein the ceramic fine particles have a spherical shape having an average particle diameter of 10 μm ≤ 400 μm or a configuration having three or more cross sections. The inline coater (8A) comprises a gravure roll (26), a doctor chamber (25), an inlet near roll (27), an exit near roll (28) and a plurality of guide rolls (24). The separator manufacturing system for LIB according to 1 or 2. The separator manufacturing system for LIB according to claim 3, wherein the positional relationship between the gravure roll (26) and each of the near rolls (27, 28) is 0 ° ≤ θ ≤ 150 °. The separator manufacturing system for LIB according to claim 3 or 4, wherein the in- line coater (8A) is not provided with a drying function. A quadrangular weir (40) including a rhombus is formed on the surface (26a) of the gravure roll (26) in a regular arrangement, and the angle θ of the vertical line of the quadrangle is the rotation direction of the gravure roll (26). 0 ° ≤ θ <90 ° with respect to (R), the ratio of the short side to the long side is 0 <L ≤ 1, the height H of the groove wall is 0 μm <H ≤ 1 mm, and the surface. The separator manufacturing system for LIB according to any one of claims 3, 4, and 5, wherein the weirs (40) of (26a) are provided in 0 pieces <N ≦ 500 pieces in 1 inch. The film (22) is coated and dried when the ratio of the rotation speed of the gravure roll (26) to the transport speed (L) of the film (22) is in the range of 0 ≦ G / L ≦ 10. The separator manufacturing system for LIB according to any one of claims 3, 4, 5, and 6. The temperature and air volume of the separator (22A) are adjusted so that the amount of heat given to the film in the preheating step is 1.5 kW / h or less to suppress the drying amount of the coating liquid to 20% or less, and then In the transverse stretching step of the above, the temperature and the air volume were adjusted so that the amount of heat given to the film was 1.2 kW / h or less, and the dry amount of the remaining coating liquid could be suppressed to 20% or less. The LIB separator manufacturing system according to any one of claims 1 to 7, wherein the LIB separator manufacturing system is characterized.

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