JP2017053061A - Coating method to nonwoven fabric - Google Patents

Coating method to nonwoven fabric Download PDF

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JP2017053061A
JP2017053061A JP2015177486A JP2015177486A JP2017053061A JP 2017053061 A JP2017053061 A JP 2017053061A JP 2015177486 A JP2015177486 A JP 2015177486A JP 2015177486 A JP2015177486 A JP 2015177486A JP 2017053061 A JP2017053061 A JP 2017053061A
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nonwoven fabric
coating
coating liquid
fabric
woven fabric
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加藤 真
Makoto Kato
真 加藤
友洋 佐藤
Tomohiro Sato
友洋 佐藤
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Mitsubishi Paper Mills Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a coating method capable of highly avoiding occurrence of defects such as pinholes caused by strike-through of coating liquid without producing a lot of wastes, in the coating method to a nonwoven fabric which carries out coating of the coating liquid prepared by dispersing or dissolving a nonvolatile matter in a medium.SOLUTION: There is provided a coating method to a nonwoven fabric comprising: laminating a nonwoven fabric (A) and conveyance support; applying coating liquid (I) to a side which is not in contact with the conveyance support of the nonwoven fabric (A); drying and removing at least a portion of a medium; and releasing the nonwoven fabric (A) from the conveyance support, wherein the conveyance support is a nonwoven fabric (B). The coating method comprises applying coating liquid (II) to the nonwoven fabric (B) that is released from the nonwoven fabric (A).SELECTED DRAWING: Figure 1

Description

本発明は、不織布への塗工方法に関する。   The present invention relates to a method for coating a nonwoven fabric.

不揮発分を媒体に分散又は溶解させた塗工液を、不織布に塗工して機能性を付与することが行われている。例えば、リチウムイオン電池用セパレータ、分離膜等の用途では、不揮発分である樹脂、無機粒子、有機粒子等を媒体に分散又は溶解させた塗工液を、不織布に塗工してリチウムイオン電池用セパレータ、分離膜が製造されている。リチウムイオン電池用セパレータとしては、厚さ30μm以下という薄いセパレータが要求される。また、分離膜においても、濾過性能を向上させるために、モジュール内に収める分離膜の量を増やすために、分離膜を薄くすることが求められている。リチウムイオン電池用セパレータ、分離膜等の製品の厚さを薄くするためには、薄い不織布を使用する必要がある。薄い不織布を使用する場合、塗工液の裏抜け、すなわち、塗工液が不織布の反対面に滲み出す現象によって、塗工装置中での搬送が困難になる問題、塗工液の搬送ロールへの付着と不織布への再付着に起因する塗工均一性の低下という問題やピンホール生成の問題等を生じていた。特に、リチウムイオン電池用セパレータや分離膜等においては、所望の物質又はイオン以外の物質又はイオンを透過させないことが要求されるため、ピンホールの生成による製品性能の低下が問題になる場合が多い。   A coating solution in which a nonvolatile component is dispersed or dissolved in a medium is applied to a nonwoven fabric to impart functionality. For example, in applications such as separators and separation membranes for lithium ion batteries, a non-volatile resin, inorganic particles, organic particles, etc., dispersed or dissolved in a medium, are coated on a nonwoven fabric and used for lithium ion batteries. Separators and separation membranes are manufactured. As a separator for a lithium ion battery, a thin separator having a thickness of 30 μm or less is required. Also in the separation membrane, in order to improve the filtration performance, it is required to make the separation membrane thin in order to increase the amount of the separation membrane contained in the module. In order to reduce the thickness of products such as lithium ion battery separators and separation membranes, it is necessary to use a thin non-woven fabric. When using thin non-woven fabrics, it is difficult to transport in the coating device due to the back-through of the coating solution, that is, the phenomenon that the coating solution oozes to the opposite side of the non-woven fabric, to the coating solution transport roll There has been a problem that the coating uniformity is reduced due to the adhesion of the resin and the reattachment to the nonwoven fabric, the problem of pinhole generation, and the like. In particular, in lithium ion battery separators and separation membranes, it is required not to allow a substance or ions other than the desired substance or ions to pass therethrough, and thus deterioration in product performance due to the generation of pinholes is often a problem. .

塗工液の裏抜け(以下、「塗工液の裏抜け」を「裏抜け」と記す場合がある)に伴うこれら諸問題を解決するために、以下のような技術が提案されている。例えば、不織布と、塗工液を塗工してなる塗工層とを、搬送支持体と積層し、乾燥後に搬送支持体を剥離して製品を得る方法が提案されている(例えば、特許文献1〜4参照)。搬送支持体としては、裏抜けが発生しない、緻密な紙や樹脂フィルムが開示されている。また、2層の不織布を積層し、双方の不織布に塗工液を含浸し、片面から塗工液を凝固させた後、2層の不織布を剥離してその一方を製品として得る方法が提案されている(例えば、特許文献5参照)。しかし、これらの方法には、使用後の搬送支持体や一方の不織布を廃棄することから、コストが高くなるのみならず、大量の廃棄物が生じる等の問題があった。   In order to solve these various problems associated with coating solution strikethrough (hereinafter, “coating solution breakthrough” may be referred to as “breakthrough”), the following techniques have been proposed. For example, a method of obtaining a product by laminating a nonwoven fabric and a coating layer formed by coating a coating liquid with a transport support and peeling the transport support after drying has been proposed (for example, Patent Documents). 1-4). As the transport support, a dense paper or resin film that does not cause back-through is disclosed. Also proposed is a method of laminating two layers of non-woven fabric, impregnating the non-woven fabric with a coating solution, coagulating the coating solution from one side, and then peeling the two layers of non-woven fabric to obtain one of them as a product. (For example, see Patent Document 5). However, these methods have a problem that not only the cost is increased but also a large amount of waste is generated because the transport support after use and one of the nonwoven fabrics are discarded.

また、塗工液を付与した後の不織布を特定のロールを用いて搬送することによって、裏抜けに伴う面質の悪化を回避する方法も提案されている(例えば、特許文献6〜8参照)。しかし、これらの方法では、ピンホール等の欠点が発生する場合があった。   Moreover, the method of avoiding the deterioration of the surface quality accompanying back-through by conveying the nonwoven fabric after giving a coating liquid using a specific roll is also proposed (for example, refer patent documents 6-8). . However, these methods sometimes have drawbacks such as pinholes.

特定の物性の不織布を使用する方法(例えば、特許文献9及び10参照)、特定の物性の塗工液を使用する方法(例えば、特許文献11参照)によって、裏抜けを回避する方法も提案されている。しかし、これらの方法では、不織布や塗工液の選択の幅が狭いために、製品性能やコストの観点から最適な不織布や塗工液が選択できなくなる場合があった。とりわけ、裏抜けが少ない不織布は、必然的に液体や気体の透過性が低い不織布となってしまうため、リチウムイオン電池用セパレータや分離膜と言った、物質やイオンの透過を目的とした製品においては、著しい制約となる場合が多い。   There have also been proposed methods for avoiding show-through by a method using a non-woven fabric having specific physical properties (for example, see Patent Documents 9 and 10) and a method using a coating liquid having specific physical properties (for example, see Patent Document 11). ing. However, in these methods, since the range of selection of the nonwoven fabric and the coating liquid is narrow, there are cases where the optimal nonwoven fabric and coating liquid cannot be selected from the viewpoint of product performance and cost. In particular, non-woven fabrics with low back-through will inevitably become non-woven fabrics with low liquid and gas permeability. Therefore, in products intended for the permeation of substances and ions, such as lithium ion battery separators and separation membranes. Is often a significant limitation.

特開2005−268096号公報JP 2005-268096 A 特開2005−302341号公報Japanese Patent Laying-Open No. 2005-302341 特開2013−186958号公報JP 2013-186958 A 特開2013−229118号公報JP 2013-229118 A 国際特許公報WO2008/153117号パンフレットInternational Patent Publication WO2008 / 153117 Pamphlet 特開2014−192027号公報JP 2014-192027 A 特開2014−192147号公報JP 2014-192147 A 特開2015−8109号公報Japanese Patent Laying-Open No. 2015-8109 特開2013−154304号公報JP 2013-154304 A 特開2013−154341号公報JP 2013-154341 A 特開2014−44857号公報JP 2014-44857 A

本発明の課題は、不揮発分を媒体に分散又は溶解させた塗工液を不織布に塗工する不織布への塗工方法において、塗工液の裏抜けに起因するピンホール等の欠陥の発生を、多量の廃棄物を生じさせることなく、高度に回避できる塗工方法を提供することにある。   An object of the present invention is to generate defects such as pinholes due to back-through of the coating liquid in a coating method on a nonwoven fabric in which a coating liquid in which a nonvolatile content is dispersed or dissolved in a medium is applied to the nonwoven fabric. An object of the present invention is to provide a coating method that can be avoided to a high degree without generating a large amount of waste.

(1)不織布(A)と搬送支持体とを積層し、不織布(A)の搬送支持体と接していない側に塗工液(I)を付与し、媒体の少なくとも一部を乾燥除去した後に、不織布(A)と搬送支持体とを剥離する不織布への塗工方法であって、搬送支持体が不織布(B)であり、不織布(A)から剥離された不織布(B)に塗工液(II)を付与することを特徴とする不織布への塗工方法。 (1) After laminating the nonwoven fabric (A) and the transport support, applying the coating liquid (I) to the side of the nonwoven fabric (A) that is not in contact with the transport support, and drying and removing at least a part of the medium A coating method for applying a nonwoven fabric (A) to the nonwoven fabric (B), which is a nonwoven fabric (B), wherein the nonwoven fabric (A) is separated from the nonwoven fabric (A). (II) is given, The coating method to the nonwoven fabric characterized by the above-mentioned.

(2)不織布(A)と不織布(B)が同種である(1)記載の不織布への塗工方法。 (2) The coating method to the nonwoven fabric according to (1), wherein the nonwoven fabric (A) and the nonwoven fabric (B) are the same type.

(3)塗工液(I)を塗工液(II)が同種である(1)又は(2)記載の不織布への塗工方法。 (3) The coating method to the nonwoven fabric according to (1) or (2), wherein the coating liquid (I) is the same type as the coating liquid (I).

(4)不織布(A)と不織布(B)が連続したウェブである(2)記載の不織布への塗工方法。 (4) The coating method to the nonwoven fabric according to (2), wherein the nonwoven fabric (A) and the nonwoven fabric (B) are continuous webs.

不織布への塗工方法(1)〜(2)により、不織布への塗工における、裏抜けに起因する悪影響を、多量の廃棄物を生じさせることなく、高度に回避できるようになる。   By the coating methods (1) to (2) for the nonwoven fabric, it is possible to highly avoid the adverse effects caused by the back-through in the coating to the nonwoven fabric without causing a large amount of waste.

不織布への塗工方法(3)により、不織布(A)に塗工した塗工液(I)の裏抜けによる不織布(B)への汚染が、不織布(B)に塗工液(II)を塗工して得られる製品の品質に影響を及ぼしにくいため、品質の高い製品を得ることができる。   Contamination to the non-woven fabric (B) due to the back-through of the coating liquid (I) applied to the non-woven fabric (A) by the coating method (3) on the non-woven fabric causes the coating liquid (II) to be applied to the non-woven fabric (B). Since it hardly affects the quality of the product obtained by coating, a high-quality product can be obtained.

不織布への塗工方法(4)により、塗工装置及び塗工の操業を簡略化することができる。   By the coating method (4) for the nonwoven fabric, the coating apparatus and the coating operation can be simplified.

本発明の不織布への塗工方法に用いる塗工装置の一例を示した概略図である。It is the schematic which showed an example of the coating apparatus used for the coating method to the nonwoven fabric of this invention. 本発明の不織布への塗工方法に用いる塗工装置の一例を示した概略図である。It is the schematic which showed an example of the coating apparatus used for the coating method to the nonwoven fabric of this invention. 図2に示した塗工装置に用いるウェブ横取り装置の一例を示した概略図である。It is the schematic which showed an example of the web intercepting apparatus used for the coating apparatus shown in FIG.

本発明は、不織布への塗工方法(以下、単に「塗工方法」と記す場合がある)である。より詳しくは、不織布(A)に不揮発分を媒体に分散又は溶解させた塗工液を塗工するための方法である。本発明は、基材である不織布(A)と搬送支持体とを積層し、不織布(A)の搬送支持体と接していない側に塗工液を付与し、媒体の少なくとも一部を乾燥除去した後に、不織布(A)と搬送支持体とを剥離する不織布への塗工方法であって、搬送支持体が不織布(B)であり、不織布(A)から剥離された不織布(B)に塗工液(II)を付与することを特徴とする   The present invention is a coating method (hereinafter sometimes simply referred to as “coating method”) to a nonwoven fabric. More specifically, it is a method for coating a non-woven fabric (A) with a coating solution in which a nonvolatile component is dispersed or dissolved in a medium. The present invention laminates a nonwoven fabric (A) as a base material and a conveyance support, applies a coating solution to the side of the nonwoven fabric (A) that is not in contact with the conveyance support, and removes at least a part of the medium by drying. After that, the nonwoven fabric (A) is applied to the nonwoven fabric (B), which is a nonwoven fabric (B), which is a nonwoven fabric (B). It is characterized by applying industrial fluid (II)

本発明では、不織布(A)の表面に、不揮発分を媒体に溶解又は分散させた塗工液(I)を付与し、塗工液の媒体を乾燥除去させることによって、不織布(A)に塗工層を形成させた製品を得る。本発明において、搬送支持体とは、工程上、不織布(A)の搬送を補助するために用いられるウェブ状の材料である。搬送支持体は、塗工液(I)を不織布(A)に付与した際に、塗工液を付与された面と反対側の面から滲み出す塗工液が、不織布(A)の搬送に用いられるロールに付着することを防ぎ、塗工層にピンホール等の欠陥を生じることを抑制する。   In the present invention, a coating liquid (I) in which a non-volatile component is dissolved or dispersed in a medium is applied to the surface of the nonwoven fabric (A), and the medium of the coating liquid is dried and removed to apply the coating liquid to the nonwoven fabric (A). A product with a construction layer is obtained. In this invention, a conveyance support body is a web-like material used in order to assist conveyance of a nonwoven fabric (A) on a process. When the transfer support is applied to the nonwoven fabric (A) with the coating liquid (I), the coating liquid that exudes from the surface opposite to the surface to which the coating liquid is applied is used to transfer the nonwoven fabric (A). It prevents sticking to the roll used and suppresses the occurrence of defects such as pinholes in the coating layer.

従来、搬送支持体としては、緻密な紙や樹脂フィルムが使用されてきた。本発明では、搬送支持体として、不織布(B)を使用する。従来の技術と比較して、本発明は以下の点で相違しており、この相違に基づく効果を有する。第一に、搬送支持体が不織布(B)であることによって、不織布(A)と搬送支持体間での不均一な塗工液の分配が起こりにくく、より高度にピンホール等の欠陥を生じることを抑制することができる。第二に、搬送支持体である不織布(A)から剥離された不織布(B)を使い捨てとせず、不織布(B)に塗工液(II)を付与して他の製品を得ることによって、無為に廃棄物を発生することが無く、経済的であるのみならず、環境保全の観点からも好ましいという効果が得られる。   Conventionally, dense paper and resin films have been used as the transport support. In this invention, a nonwoven fabric (B) is used as a conveyance support body. Compared with the prior art, the present invention is different in the following points and has an effect based on this difference. First, since the conveyance support is the nonwoven fabric (B), uneven distribution of the coating liquid between the nonwoven fabric (A) and the conveyance support is unlikely to occur, and defects such as pinholes are caused to a higher degree. This can be suppressed. Secondly, the non-woven fabric (B) peeled from the non-woven fabric (A) that is the transport support is not made disposable, but by applying the coating liquid (II) to the non-woven fabric (B) to obtain other products, In addition to being economical, it is advantageous not only in terms of economy but also from the viewpoint of environmental protection.

本発明において、不織布(A)と不織布(B)が同種であることが好ましい。これによって、不織布(A)と不織布(B)間での不均一な塗工液の分配が非常に起こりにくく、更に高度に裏抜けに起因する悪影響を回避することができる。   In this invention, it is preferable that a nonwoven fabric (A) and a nonwoven fabric (B) are the same kind. As a result, uneven distribution of the coating liquid between the non-woven fabric (A) and the non-woven fabric (B) is very difficult to occur, and the adverse effects caused by the strikethrough can be avoided to a high degree.

また、本発明において、塗工液(I)と塗工液(II)が同種であることが好ましい。この場合、不織布(A)に塗工した塗工液(I)の裏抜けによる不織布(B)への汚染が、不織布(B)に塗工液(II)(=塗工液(I))を塗工して得られる製品の品質に影響を及ぼしにくいためである。   In the present invention, the coating liquid (I) and the coating liquid (II) are preferably the same. In this case, the non-woven fabric (B) is contaminated by the back-through of the coating liquid (I) applied to the non-woven fabric (A), and the non-woven fabric (B) is coated with the coating liquid (II) (= the coating liquid (I)). This is because it does not easily affect the quality of products obtained by coating.

また、本発明において、不織布(A)と不織布(B)が連続したウェブであることが好ましい。言い換えれば、不織布(A)から剥離された不織布(B)を、そのまま不織布(A)として連続的に用いることが好ましい。これによって、不織布(B)の取り扱いに必要な独立した巻き出し装置、巻き取り装置が不要になり、塗工装置が簡略化されるばかりでなく、不織布(B)のロール交換作業が不要となり、塗工装置の操業に必要な手間も少なくできるからである。   Moreover, in this invention, it is preferable that a nonwoven fabric (A) and a nonwoven fabric (B) are the continuous webs. In other words, it is preferable to continuously use the nonwoven fabric (B) peeled from the nonwoven fabric (A) as it is as the nonwoven fabric (A). This eliminates the need for an independent unwinding device and winding device necessary for handling the nonwoven fabric (B), which not only simplifies the coating device, but also eliminates the need for roll replacement of the nonwoven fabric (B). This is because the labor required for the operation of the coating apparatus can be reduced.

図1及び図2は、本発明の不織布への塗工方法に用いる塗工装置の一例を示した概略図である。図1は、不織布(A)と不織布(B)が独立したウェブである場合の塗工装置の一例を示している。不織布(A)の巻き出し装置1から送り出された不織布(A)は、不織布(B)の巻き出し装置2から送り出された不織布(B)と、不織布(A)と不織布(B)の積層装置3によって積層される。積層された不織布の不織布(A)側の表面に、塗工液(I)の付与装置4によって塗工液(I)が付与され、乾燥装置5によって、媒体が乾燥除去される。その後、不織布(A)と不織布(B)の剥離装置6によって、不織布(A)と不織布(B)が剥離され、不織布(A)から剥離された不織布(B)は、不織布(B)の巻き取り装置7によって巻き取られる。そして、後で、不織布(B)に塗工液(II)が付与されて製品となる。不織布(A)に塗工液(I)が塗工されて、塗工層が形成された製品は、製品の巻き取り装置8によって巻き取られ、そのままで又は更なる加工が施されて、用いられる。図1において、符号が付いていないロールは、搬送に用いられるロールである。   FIG.1 and FIG.2 is the schematic which showed an example of the coating apparatus used for the coating method to the nonwoven fabric of this invention. FIG. 1 shows an example of a coating apparatus when the nonwoven fabric (A) and the nonwoven fabric (B) are independent webs. The nonwoven fabric (A) sent out from the unwinding device 1 of the nonwoven fabric (A) is a nonwoven fabric (B) sent out from the unwinding device 2 of the nonwoven fabric (B), and a laminating device of the nonwoven fabric (A) and the nonwoven fabric (B). 3 are stacked. The coating liquid (I) is applied to the surface of the laminated nonwoven fabric (A) side by the coating liquid (I) applying device 4, and the medium is dried and removed by the drying device 5. Thereafter, the non-woven fabric (A) and the non-woven fabric (B) are peeled off by the non-woven fabric (A) and the non-woven fabric (B) peeling device 6, and the non-woven fabric (B) peeled from the non-woven fabric (A) is wound on the non-woven fabric (B). It is wound up by the take-up device 7. Thereafter, the coating liquid (II) is applied to the non-woven fabric (B) to obtain a product. The product in which the coating liquid (I) is applied to the nonwoven fabric (A) and the coating layer is formed is wound up by the product winding device 8 and used as it is or after further processing. It is done. In FIG. 1, rolls without reference numerals are rolls used for conveyance.

図2は、不織布(A)と不織布(B)が連続したウェブである場合の塗工装置の一例を示している。不織布(B)は、不織布(B)の巻き出し装置2から送り出され、不織布(A)と不織布(B)の積層装置3によって、不織布(A)と積層される。積層された不織布の不織布(A)側の表面に、塗工液(I)の付与装置4によって塗工液(I)が付与され、乾燥装置5によって、媒体が乾燥除去される、その後、不織布(A)と不織布(B)の剥離装置6によって、不織布(A)と不織布(B)が剥離される。塗工液(I)が塗工されて塗工層が形成された不織布(A)は製品の巻き取り装置8によって巻き取られ、そのままで、又は更なる加工を施して、用いられる。不織布(A)から剥離された不織布(B)は、2台のウェブの横取り装置9を使用することで、不織布(B)の経路の外側に導かれ、不織布(A)と不織布(B)の積層装置3を経由して、今度は、直ちに不織布(A)として用いられる。図2において、符号が付いていないロールは、搬送に用いられるロールである。   FIG. 2 shows an example of a coating apparatus when the nonwoven fabric (A) and the nonwoven fabric (B) are continuous webs. The nonwoven fabric (B) is fed out from the unwinding device 2 of the nonwoven fabric (B), and laminated with the nonwoven fabric (A) by the laminating device 3 of the nonwoven fabric (A) and the nonwoven fabric (B). The coating liquid (I) is applied to the surface of the laminated nonwoven fabric (A) side by the coating liquid (I) applying device 4, and the medium is dried and removed by the drying device 5. The non-woven fabric (A) and the non-woven fabric (B) are peeled off by the peeling device 6 for (A) and the non-woven fabric (B). The non-woven fabric (A) on which the coating liquid (I) has been applied to form a coating layer is wound up by the product winding device 8 and used as it is or after further processing. The non-woven fabric (B) peeled from the non-woven fabric (A) is guided to the outside of the non-woven fabric (B) path by using two web intercepting devices 9, and the non-woven fabric (A) and the non-woven fabric (B). This time, it is immediately used as a nonwoven fabric (A) via the laminating apparatus 3. In FIG. 2, rolls without reference numerals are rolls used for conveyance.

図3には、図2に示した塗工装置に用いる、ウェブ横取り装置の概略図の一例を示している。不織布(B)であるウェブ11は、2本の方向変換ロール10によって、その経路を水平方向に移動され、不織布(A)となる。   FIG. 3 shows an example of a schematic diagram of a web intercepting device used in the coating apparatus shown in FIG. The web 11 which is the nonwoven fabric (B) is moved in the horizontal direction by the two direction change rolls 10 to become the nonwoven fabric (A).

本発明において、塗工液(I)又は(II)の付与装置に特に制限は無い。ただし、余りにも多量の塗工液(I)又は(II)が裏抜けした場合、本発明によっても裏抜けに起因する悪影響を回避することが困難になることから、多量の裏抜けが発生しにくい塗工液の付与装置を用いることが好ましい。具体的には、キスタッチグラビアコーター、キスロールコーター、ダイコーター、スプレーコーター等の塗工液の付与装置が好ましく用いられる。   In this invention, there is no restriction | limiting in particular in the application apparatus of coating liquid (I) or (II). However, if too much of the coating liquid (I) or (II) breaks through, it will be difficult to avoid the adverse effects caused by the breakthrough even by the present invention, resulting in a large amount of breakthrough. It is preferable to use an apparatus for applying a difficult coating liquid. Specifically, a coating liquid application device such as a kiss touch gravure coater, a kiss roll coater, a die coater, or a spray coater is preferably used.

本発明において、乾燥装置にも特に制限は無い。不織布の表面に熱風や乾燥空気を吹きつけて乾燥するエアドライヤー、加熱した金属製円筒の表面に不織布を接触させることで加熱乾燥するシリンダードライヤー、赤外線により不織布を加熱する赤外線ドライヤー等の乾燥装置を用いることができる。   In the present invention, the drying apparatus is not particularly limited. Drying equipment such as an air dryer that blows hot air or dry air on the surface of the nonwoven fabric, a cylinder dryer that heats and dryes the nonwoven fabric by contacting the surface of a heated metal cylinder, or an infrared dryer that heats the nonwoven fabric with infrared rays Can be used.

本発明において、不織布(A)及び(B)にも特に制限は無い。ただし、厚い不織布を用いる場合には、そもそも裏抜けが生じにくく、本発明の技術を使用する動機に乏しい。逆に、薄い不織布、具体的には、その厚さが30μm以下である不織布を用いる場合には、本発明によって、塗工の均一性を大幅に向上させられる。   In the present invention, the nonwoven fabrics (A) and (B) are not particularly limited. However, in the case of using a thick nonwoven fabric, it is difficult for the back-through to occur in the first place, and the motivation for using the technique of the present invention is poor. Conversely, when a thin nonwoven fabric, specifically, a nonwoven fabric having a thickness of 30 μm or less is used, the present invention can greatly improve the coating uniformity.

以下、本発明を実施例により更に詳細に説明するが、本発明は本実施例に限定されるものではない。   EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to a present Example.

[不織布1]
繊度0.1dtex、カット長3mmの延伸結晶化ポリエチレンテレフタレートステープル70質量部及び繊度0.2dtex、カット長3mmの非延伸ポリエチレンテレフタレートステープル30質量部からなり、表面温度200℃の熱カレンダーにより強度の付与及び厚み調整を行った、坪量10g/m、厚み18μmの湿式抄造不織布を、不織布1とした。
[Nonwoven fabric 1]
It consists of 70 parts by mass of stretched crystallized polyethylene terephthalate staples with a fineness of 0.1 dtex and a cut length of 3 mm, and 30 parts by mass of non-stretched polyethylene terephthalate staples with a fineness of 0.2 dtex and a cut length of 3 mm. A wet papermaking nonwoven fabric having a basis weight of 10 g / m 2 and a thickness of 18 μm, which was adjusted in thickness, was designated as the nonwoven fabric 1.

[不織布2]
繊度0.3dtex、カット長3mmの延伸結晶化ポリエチレンテレフタレートステープル70質量部及び繊度0.2dtex、カット長3mmの非延伸ポリエチレンテレフタレートステープル30質量部からなり、表面温度200℃の熱カレンダーにより強度の付与及び厚み調整を行った、坪量10g/m、厚み18μmの湿式抄造不織布を、不織布2とした。
[Nonwoven fabric 2]
It consists of 70 parts by mass of stretched crystallized polyethylene terephthalate staples with a fineness of 0.3 dtex and a cut length of 3 mm, and 30 parts by mass of non-stretched polyethylene terephthalate staples with a fineness of 0.2 dtex and a cut length of 3 mm. A wet papermaking nonwoven fabric having a basis weight of 10 g / m 2 and a thickness of 18 μm, which was adjusted in thickness, was designated as the nonwoven fabric 2.

[塗工液]
不揮発分の質量構成比が、アルミナ水和物(ベーマイト):アクリル系ポリマーのラテックス:マレイン酸−アクリル酸共重合体のナトリウム塩:1質量%水溶液の粘度が7000mPa・secであるカルボキシメチルセルロース=40.0:2.0:0.4:0.2である、固形分濃度20質量%の塗工液を調製した。
[Coating fluid]
Carboxymethylcellulose having a nonvolatile mass composition ratio of alumina hydrate (boehmite): acrylic polymer latex: maleic acid-acrylic acid copolymer sodium salt: viscosity of 7000 mPa · sec of 1% by mass aqueous solution = 40 A coating solution having a solid content concentration of 20% by mass, which was 0.0: 2.0: 0.4: 0.2, was prepared.

[実施例1]
不織布(A)及び不織布(B)として不織布1を用い、図1に概略を示す塗工装置によって、前記塗工液を、媒体(水)を含むWET塗工量が50g/mとなるように塗工した。塗工液の付与装置4としては、ダイコーターを使用した。乾燥装置5としては、塗工液を付与しない面をロールで支持する、有効長100cmの両面エアドライヤーを用いた。不織布(A)及び不織布(B)の幅は200mm、塗工速度は2m/minとした。
[Example 1]
The non-woven fabric 1 is used as the non-woven fabric (A) and the non-woven fabric (B), and the WET coating amount including the medium (water) is 50 g / m 2 using the coating apparatus schematically shown in FIG. Coated. A die coater was used as the coating liquid application device 4. As the drying device 5, a double-sided air dryer with an effective length of 100 cm that supports a surface to which the coating liquid is not applied with a roll was used. The width of the nonwoven fabric (A) and the nonwoven fabric (B) was 200 mm, and the coating speed was 2 m / min.

[実施例2]
不織布(A)及び不織布(B)として不織布2を用いた以外は、実施例1と同様にして、不織布(A)への塗工を行った。
[Example 2]
The nonwoven fabric (A) was coated in the same manner as in Example 1 except that the nonwoven fabric 2 was used as the nonwoven fabric (A) and the nonwoven fabric (B).

[実施例3]
不織布(A)として不織布2を用い、不織布(B)として不織布1を用いた以外は、実施例1と同様にして、不織布(A)への塗工を行った。
[Example 3]
The nonwoven fabric (A) was coated in the same manner as in Example 1 except that the nonwoven fabric 2 was used as the nonwoven fabric (A) and the nonwoven fabric 1 was used as the nonwoven fabric (B).

[実施例4]
不織布(A)として不織布1を用い、不織布(B)として不織布2を用いた以外は、実施例1と同様にして、不織布(A)への塗工を行った。
[Example 4]
The nonwoven fabric (A) was coated in the same manner as in Example 1 except that the nonwoven fabric 1 was used as the nonwoven fabric (A) and the nonwoven fabric 2 was used as the nonwoven fabric (B).

[実施例5]
不織布(A)として、実施例1の不織布(B)として一度使用された不織布1を用いた以外は、実施例1と同様にして、不織布(A)への塗工を行った。
[Example 5]
The nonwoven fabric (A) was coated in the same manner as in Example 1 except that the nonwoven fabric 1 used once as the nonwoven fabric (B) of Example 1 was used as the nonwoven fabric (A).

[実施例6]
不織布(A)として、実施例2の不織布(B)として一度使用された不織布2を用いた以外は、実施例2と同様にして、不織布(A)への塗工を行った。
[Example 6]
The nonwoven fabric (A) was coated in the same manner as in Example 2 except that the nonwoven fabric 2 used once as the nonwoven fabric (B) of Example 2 was used as the nonwoven fabric (A).

[実施例7]
塗工装置として、図2に概略を示す装置を使用し、不織布(B)(塗工装置内で、そのまま不織布(A)として使用される)として不織布1を用いた以外は、実施例1と同様にして塗工を行った。
[Example 7]
As the coating apparatus, Example 1 is used except that the apparatus schematically shown in FIG. 2 is used and the nonwoven fabric 1 is used as the nonwoven fabric (B) (used as the nonwoven fabric (A) as it is in the coating apparatus). Coating was performed in the same manner.

[比較例1]
不織布(A)として不織布1を用い、搬送支持体として、不織布(B)の代わりに表面をポリエチレン樹脂でラミネートした紙を用いた以外は、実施例1と同様にして、不織布(A)への塗工を行った。
[Comparative Example 1]
The nonwoven fabric (A) was used in the same manner as in Example 1 except that the nonwoven fabric 1 was used as the nonwoven fabric (A), and the transport support was a paper laminated with a polyethylene resin on the surface instead of the nonwoven fabric (B). Coating was performed.

[比較例2]
搬送支持体として、比較例1で一度使用されたポリエチレン樹脂でラミネートした紙を用いた以外は、比較例1と同様にして、不織布(A)への塗工を行った。
[Comparative Example 2]
The nonwoven fabric (A) was coated in the same manner as in Comparative Example 1 except that the paper laminated with the polyethylene resin once used in Comparative Example 1 was used as the transport support.

[評価]
塗工後の不織布(A)の100mm×100mmの領域を、解像度600dpiの透過式スキャナでスキャンし、得られたヒストグラムの主たるピークから、5σ以上高い輝度を有するピクセルをピンホールとみなし、そのピクセル数により、均一性を判断した。ピクセル数が少ない程、均一性の高い塗工になったと判断できる。結果を表1に示す。
[Evaluation]
A 100 mm × 100 mm area of the nonwoven fabric (A) after coating is scanned with a transmission scanner with a resolution of 600 dpi, and a pixel having a brightness higher than 5σ from the main peak of the obtained histogram is regarded as a pinhole. Uniformity was judged by the number. It can be determined that the smaller the number of pixels, the more uniform the coating. The results are shown in Table 1.

Figure 2017053061
Figure 2017053061

搬送支持体として不織布(B)を用いた実施例1〜7のピンホールのピクセル数が9〜36個であったのに対し、搬送支持体としてポリエチレン樹脂でラミネートした紙を用いた比較例1〜2のピンホールのピクセル数は51〜620個であり、搬送支持体として不織布(B)を用いる本発明により、ピンホール等の欠陥が少ない良好な塗工品質を得ることができることが分かる。   Comparative Example 1 using paper laminated with polyethylene resin as the conveyance support, whereas the number of pixels of the pinholes of Examples 1 to 7 using the nonwoven fabric (B) as the conveyance support was 9 to 36 It can be seen that the number of pixels of ˜2 pinholes is 51 to 620, and good coating quality with few defects such as pinholes can be obtained by the present invention using the nonwoven fabric (B) as the transport support.

不織布(A)が不織布1の場合、不織布(A)として塗工液の成分が付着していない不織布1を用いた実施例1のピンホールのピクセル数12個に対し、不織布(A)として、搬送支持体である不織布(B)として使用され、塗工液の成分が付着した不織布1を使用した実施例5のピンホールのピクセル数は9個であり、不織布(B)として使用された不織布を不織布(A)として用いたことの悪影響は見られないばかりか、むしろピンホールのピクセル数が減少する傾向にあった。   When the non-woven fabric (A) is the non-woven fabric 1, the non-woven fabric (A) is a non-woven fabric (A), and the non-woven fabric 1 to which the components of the coating liquid are not attached is used as the non-woven fabric (A). Nonwoven fabric used as nonwoven fabric (B), which is used as nonwoven fabric (B) as a transport support, and has 9 pinholes in Example 5 using nonwoven fabric 1 to which the components of the coating liquid are attached There was no adverse effect of using as a nonwoven fabric (A), but rather the number of pinhole pixels tended to decrease.

不織布(A)が不織布2の場合も、不織布(A)として塗工液の成分が付着していない不織布2を用いた実施例2のピンホールのピクセル数20個に対し、不織布(A)として、搬送支持体である不織布(B)として使用され、塗工液の成分が付着した不織布2を使用した実施例6のピンホールのピクセル数は16個であり、やはり不織布(B)として使用された不織布を不織布(A)として用いたことの悪影響は見られないばかりか、むしろピンホールのピクセル数が減少する傾向にあった。   When the non-woven fabric (A) is the non-woven fabric 2, the non-woven fabric (A) is 20 non-woven fabric (A). The number of pixels of the pinhole of Example 6 using the non-woven fabric 2 to which the components of the coating liquid are attached is 16 and is also used as the non-woven fabric (B). In addition, there was no adverse effect of using the non-woven fabric as the non-woven fabric (A), but rather the number of pinhole pixels tended to decrease.

一方、搬送支持体としてポリエチレン樹脂でラミネートした紙を用いた場合には、塗工液の成分が付着していないポリエチレン樹脂でラミネートした紙を用いた比較例1のピンホールのピクセル数51個に対し、搬送支持体として使用され、塗工液の成分が付着したポリエチレン樹脂でラミネートした紙を、再度搬送支持体として使用した比較例2ではピンホールのピクセル数が620個と大幅に増えている。   On the other hand, when a paper laminated with polyethylene resin is used as the transport support, the number of pixels of the pinhole of Comparative Example 1 using 51 paper laminated with polyethylene resin to which no component of the coating solution is attached is 51. On the other hand, the number of pinhole pixels is significantly increased to 620 in Comparative Example 2 in which paper used as a transport support and laminated with a polyethylene resin to which the components of the coating solution are attached is used again as a transport support. .

不織布(A)が不織布1の場合、不織布(B)も不織布1である実施例1及び5のピンホールのピクセル数が9〜12個であったのに対し、不織布(B)が不織布2である実施例4のピンホールのピクセル数は21個であった。また、不織布(A)が不織布2の場合、不織布(B)も不織布2である実施例2及び6のピンホールのピクセル数が16〜20個であったのに対し、不織布(B)が不織布1である実施例3のピンホールのピクセル数は36個であった。これらより、本発明の好ましい実施態様である、不織布(A)と搬送支持体である不織布(B)が同種であることにより、ピンホール等の欠陥がより少ない、非常に良好な塗工品質を得ることができることが分かる。   When the non-woven fabric (A) is the non-woven fabric 1, the non-woven fabric (B) is also the non-woven fabric 1, while the non-woven fabric (B) is the non-woven fabric 2 while the number of pinholes in Examples 1 and 5 is 9-12. In Example 4, the number of pixels in the pinhole was 21. Moreover, when the nonwoven fabric (A) is the nonwoven fabric 2, the nonwoven fabric (B) is also the nonwoven fabric 2, while the number of pinholes in Examples 2 and 6 in which the nonwoven fabric (B) is the nonwoven fabric 2 is 16 to 20, whereas the nonwoven fabric (B) is the nonwoven fabric. The number of pixels of the pinhole of Example 3, which is 1, was 36. From these, the non-woven fabric (A) which is a preferred embodiment of the present invention and the non-woven fabric (B) which is a conveyance support are the same type, so that there are fewer defects such as pinholes and a very good coating quality. It can be seen that it can be obtained.

また、不織布(A)と不織布(B)が連続したウェブであり、不織布(A)から剥離された不織布(B)を、装置内で直ちに不織布(A)として用いる実施例7のピンホールのピクセル数は7個であり、不織布1を不織布(B)として用いた後一旦巻き取り、その後、不織布(A)として再利用する実施例5のピンホールのピクセル数(9個)よりも少なくなっている。   The pinhole pixel of Example 7 in which the nonwoven fabric (A) and the nonwoven fabric (B) are continuous webs, and the nonwoven fabric (B) peeled from the nonwoven fabric (A) is immediately used as the nonwoven fabric (A) in the apparatus. The number is 7, and after the nonwoven fabric 1 is used as the nonwoven fabric (B), it is wound up, and then reused as the nonwoven fabric (A), which is less than the number of pixels of the pinhole of Example 5 (9). Yes.

なお、本実施例では、乾燥装置の有効長の関係で塗工速度が2m/minに制限されているが、塗工液の裏抜けは経時で進む(悪化する)現象であるため、塗工速度が高速になることはむしろ有利であり、有効長の長いエアドライヤーを使用すれば、高速化は容易である。   In this example, the coating speed is limited to 2 m / min due to the effective length of the drying apparatus, but the coating liquid breakthrough is a phenomenon that progresses (deteriorates) with time, and thus the coating speed is reduced. It is rather advantageous to increase the speed, and if an air dryer having a long effective length is used, the speed can be increased easily.

本発明の不織布への塗工方法は、不織布に各種の塗工液を塗工してなる製品の製造、例えば、不織布に無機粒子を塗工してなるリチウムイオン二次電池用セパレータの製造に用いる不織布への塗工方法として好適に使用できる。   The coating method on the nonwoven fabric of the present invention is for the manufacture of products obtained by applying various coating liquids to the nonwoven fabric, for example, the manufacture of a separator for lithium ion secondary batteries formed by coating inorganic particles on the nonwoven fabric. It can use suitably as a coating method to the nonwoven fabric to be used.

1 不織布(A)の巻き出し装置
2 不織布(B)の巻き出し装置
3 不織布(A)と不織布(B)の積層装置
4 塗工液(I)の付与装置
5 乾燥装置
6 不織布(A)と不織布(B)の剥離装置
7 不織布(B)の巻き取り装置
8 製品の巻き取り装置
9 ウェブの横取り装置
10 方向変換ロール
11 ウェブ
DESCRIPTION OF SYMBOLS 1 Unwoven device (A) unwinding device 2 Unwoven fabric (B) unwinding device 3 Nonwoven fabric (A) and nonwoven fabric (B) laminating device 4 Coating liquid (I) applying device 5 Drying device 6 Nonwoven fabric (A) Non-woven fabric (B) stripping device 7 Non-woven fabric (B) winding device 8 Product winding device 9 Web horizontal scanning device 10 Direction changing roll 11 Web

Claims (4)

不織布(A)と搬送支持体とを積層し、不織布(A)の搬送支持体と接していない側に塗工液(I)を付与し、媒体の少なくとも一部を乾燥除去した後に、不織布(A)と搬送支持体とを剥離する不織布への塗工方法であって、搬送支持体が不織布(B)であり、不織布(A)から剥離された不織布(B)に塗工液(II)を付与することを特徴とする不織布への塗工方法。   After the nonwoven fabric (A) and the transport support are laminated, the coating liquid (I) is applied to the side of the nonwoven fabric (A) that is not in contact with the transport support, and at least a part of the medium is dried and removed. It is a coating method to the nonwoven fabric which peels A) and a conveyance support body, Comprising: A conveyance support body is a nonwoven fabric (B), and coating liquid (II) is applied to the nonwoven fabric (B) peeled from the nonwoven fabric (A). A method of coating on a non-woven fabric, characterized in that 不織布(A)と不織布(B)が同種である請求項1記載の不織布への塗工方法。   The method for coating a nonwoven fabric according to claim 1, wherein the nonwoven fabric (A) and the nonwoven fabric (B) are the same type. 塗工液(I)と塗工液(II)が同種である請求項1又は2記載の不織布への塗工方法。   The coating method for a nonwoven fabric according to claim 1 or 2, wherein the coating liquid (I) and the coating liquid (II) are the same. 不織布(A)と不織布(B)が連続したウェブである請求項2記載の不織布への塗工方法。   The method for coating a nonwoven fabric according to claim 2, wherein the nonwoven fabric (A) and the nonwoven fabric (B) are continuous webs.
JP2015177486A 2015-09-09 2015-09-09 Coating method to nonwoven fabric Pending JP2017053061A (en)

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