JP5365718B2 - Coating film drying method - Google Patents

Coating film drying method Download PDF

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JP5365718B2
JP5365718B2 JP2012084320A JP2012084320A JP5365718B2 JP 5365718 B2 JP5365718 B2 JP 5365718B2 JP 2012084320 A JP2012084320 A JP 2012084320A JP 2012084320 A JP2012084320 A JP 2012084320A JP 5365718 B2 JP5365718 B2 JP 5365718B2
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support
film
coating film
coating
belt
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JP2012157861A (en
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大樹 南野
一郎 宮川
直紀 清水
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Konica Minolta Inc
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<P>PROBLEM TO BE SOLVED: To provide a coating film drying method for preparing a functional film with higher quality and higher productivity, in vaporizing and removing a solvent in a coating film formed by applying a coating liquid on a continuously carried support body. <P>SOLUTION: In this coating film drying method, the coating film is formed by applying the coating liquid with a solid component dissolved or dispersed in the solvent on the continuously carried band-shaped plastic film support body, and then the solvent in the coating film is vaporized to obtain the functional film while the band-shaped plastic film support body having the coating film is carried. Width smoothness of the surface of the band-shaped plastic film support body is set 100% or less of thickness of the coating film of the functional film while solid content concentration in the coating film is 80 vol.% or less. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

本発明は、連続走行する帯状プラスチックフィルム支持体上に塗布液を塗布して形成された塗膜中の溶媒を蒸発させ機能性膜を得る塗膜乾燥方法に関する。更に詳しくは、帯状プラスチックフィルム支持体上に塗布液を塗布して形成された塗膜中の溶媒を蒸発させる時、塗膜の流動することにより生じる膜厚の不均一を抑制した塗膜乾燥方法に関する。   The present invention relates to a coating film drying method for obtaining a functional film by evaporating a solvent in a coating film formed by applying a coating liquid on a continuously running belt-shaped plastic film support. More specifically, a coating film drying method that suppresses non-uniform film thickness caused by the flow of the coating film when the solvent in the coating film formed by applying the coating liquid on the belt-shaped plastic film support is evaporated. About.

従来より連続走行している帯状支持体に塗布液を塗布する方法としては、各種提案されており、例えばこれらの各種塗布方式については、Edward Cohen、Edgar Gutoff著「Modern Coating and Drying Technology」に述べられている。又、単層塗布のみならず、スライドコータやエクストルージョンコータやカーテンコータなど複数のスリットを有するコーティングダイを用いることにより、同時に重層塗布することも知られている。
一般用及び産業用ハロゲン化銀感光材料、感熱材料、熱現像感光材料、フォトレジスト、LCDや有機EL等に代表される電機光学パネルのデバイス等はコータから有機溶剤系又は水系の塗布液を連続搬送する帯状支持体の上に塗布して塗膜面を形成し、その後、塗膜を有する帯状支持体を乾燥装置で乾燥することで製造されている。
Various methods have been proposed as a method for applying a coating solution to a belt-like support that is continuously running. For example, these coating methods are described in Edward Cohen and Edgar Gutoff, “Modern Coating and Drying Technology”. It has been. In addition to single layer coating, it is also known to simultaneously apply multiple layers by using a coating die having a plurality of slits such as a slide coater, an extrusion coater and a curtain coater.
General and industrial silver halide photosensitive materials, heat-sensitive materials, photothermographic materials, photoresists, electro-optical panel devices such as LCD and organic EL, etc. are continuously coated with organic solvent or water-based coating solutions from the coater. It is manufactured by coating on a belt-like support to be transported to form a coating film surface, and then drying the belt-like support having the coating film with a drying device.

又、連続走行している支持体に塗布液を塗布した後乾燥する方法としては、先述のEdward Cohen、Edgar Gutoff著「Modern Coating and Drying Technology」に述べられている各種の方法が提案されてきた。最も一般的には乾燥ボックスに温風を供給し、その温風によって塗膜を乾燥させ、気化した溶媒を気流とともに系外へ排出する方法である。又、可燃性有機溶剤を用いる場合にはエアの代わりに不活性ガスを供給し、実質的に爆発のない安全な仕組みにする装置も知られている。本発明の適用は、温風によって乾燥させる方式、装置であれば、エアであっても、不活性ガスであっても特に限定されない。   In addition, various methods described in “Modern Coating and Drying Technology” by Edward Cohen and Edgar Gutoff described above have been proposed as a method of drying after applying a coating liquid to a continuously running support. . The most general method is to supply warm air to a drying box, dry the coating film with the warm air, and discharge the vaporized solvent to the outside of the system together with the air current. In addition, when a flammable organic solvent is used, an apparatus that supplies an inert gas instead of air to make a safe mechanism substantially free of explosion is also known. The application of the present invention is not particularly limited as long as it is a system or apparatus that is dried by warm air, whether it is air or an inert gas.

乾燥工程は、塗布直後の塗膜面を加熱した雰囲気、気体が当たる雰囲気にさらすために、塗膜面の性状に影響を与える重要な工程となっている。一般的に乾燥工程における塗膜面に与える問題として気体が当たることにより塗膜表面が乱され、表面の平滑度を失い、所謂まだらムラが生じたり、乾燥工程内の温度、気体の風量等のバラツキにより乾燥ムラが生じたりすることが知られている。特に、塗布液の溶媒に有機溶剤を使用している場合は、この様な傾向が強いことが知られている。   The drying process is an important process that affects the properties of the coating film surface in order to expose the coating film surface immediately after coating to a heated atmosphere or an atmosphere that is exposed to gas. Generally, as a problem given to the coating film surface in the drying process, the surface of the coating film is disturbed by hitting the gas, losing the smoothness of the surface, so-called mottled unevenness, temperature in the drying process, gas flow rate, etc. It is known that unevenness of drying occurs due to variation. In particular, it is known that such a tendency is strong when an organic solvent is used as the solvent of the coating solution.

乾燥が正常に行われなかった場合には、得られる塗膜の外観にムラや欠陥を生じたり、塗膜中の残留溶媒が適正量でなかったり、残留溶媒量にバラツキを生じたりして、最終的な塗膜品質に影響を与えることが知られている。   If drying is not performed normally, unevenness or defects may occur in the appearance of the resulting coating, the residual solvent in the coating may not be appropriate, or the amount of residual solvent may vary, It is known to affect the final coating quality.

これまでに、塗膜面の乾燥に関して多くの検討がなされて来た。例えば、塗膜面に乾燥風を供給する複数の乾燥風供給装置の幅を塗膜面の幅よりも顕著に長くならないようにし、塗膜の幅方向の両端を越える乾燥風の量を最小限に抑え、塗膜の幅方向の両端近傍に発生するまだらムラを防止することが知られている(例えば特許文献1を参照。)。
支持体上に塗布した塗膜を乾燥する乾燥工程で、塗布後10秒以内はマイクロウェーブによる加熱により乾燥を行い、10秒から20秒までは温度を制御した乾燥風を風速が0.1〜10m/秒で塗布面へ吹き付けることにより吹かれムラを防止した乾燥を行う方法が知られている(例えば、特許文献2を参照。)。
例えば供給風の温度制御による方法が知られている(例えば、非特許文献1を参照。)。
So far, many studies have been made on the drying of the coating surface. For example, the width of a plurality of drying air supply devices that supply drying air to the coating surface should not be significantly longer than the width of the coating surface, and the amount of drying air that exceeds both ends in the width direction of the coating film should be minimized. It is known to suppress the unevenness that occurs near both ends in the width direction of the coating film (see, for example, Patent Document 1).
In the drying step of drying the coating film coated on the support, drying is performed by heating with microwaves within 10 seconds after coating, and the drying speed is 10 to 20 seconds, and the temperature of the drying air is 0.1 to 10. A method is known in which drying is performed by spraying on an application surface at 10 m / sec to prevent unevenness (see, for example, Patent Document 2).
For example, a method based on temperature control of supply air is known (see, for example, Non-Patent Document 1).

特許文献1、特許文献2、非特許文献1に記載の乾燥方法は、塗膜面の故障対策には有効な技術であるが、より高品質を求められる最近のLCDや有機EL等に代表される電機光学パネルのデバイスに必要とする機能性膜の作製に対しては未だ十分な対策となっておらず、仕上がり品の品質検査を行い、生産率を下げて対応しているのが現状である。この様な状況から、品質検査に頼ることなく、より高品質で、より高生産率の機能性膜を作製する塗膜乾燥方法の開発が望まれている。   The drying methods described in Patent Document 1, Patent Document 2, and Non-Patent Document 1 are effective techniques for countermeasures against coating surface failure, but are typified by recent LCDs and organic EL devices that require higher quality. It is not yet a sufficient measure for the production of functional films required for electro-optical panel devices, and the quality of finished products is inspected and the production rate is reduced. is there. Under such circumstances, development of a coating film drying method for producing a functional film with higher quality and higher production rate without relying on quality inspection is desired.

特表2001−506178Special table 2001-506178 特開2000−329463号公報JP 2000-329463 A

最新コーティング技術(増補版)総合技術センター発行 p.449−458Latest coating technology (enhanced version) issued by General Technology Center p. 449-458

本発明は、上記状況に鑑みなされたものであり、その目的は、連続搬送される帯状プラスチックフィルム支持体(以下、支持体とも言う)上に塗布液を塗布して形成した塗膜中の溶媒を蒸発除去する際、より高品質で、より高生産率の機能性膜を作製する塗膜乾燥方法を提供することである。   The present invention has been made in view of the above circumstances, and its object is to provide a solvent in a coating film formed by applying a coating liquid onto a continuously conveyed belt-like plastic film support (hereinafter also referred to as a support). It is to provide a coating film drying method for producing a functional film with higher quality and higher production rate when evaporating and removing water.

本発明の上記目的は、下記の構成により達成された。   The above object of the present invention has been achieved by the following constitution.

(請求項1)
連続搬送される帯状プラスチックフィルム支持体上に、溶媒中に固形分を溶解又は分散した塗布液を塗布して塗膜を形成した後、前記塗膜を有する前記帯状プラスチックフィルム支持体を搬送しながら前記塗膜中の溶媒を蒸発させて機能性膜を得る塗膜乾燥方法において、
前記塗膜中の固形分濃度が80体積%以下の間は、
前記帯状プラスチックフィルム支持体の表面の幅手平滑度を、乾燥後の前記機能性膜の塗膜の厚さの100%以下とし、
前記塗膜中の溶媒を蒸発させる時、帯状プラスチックフィルム支持体の温度を30℃以上、該帯状プラスチックフィルム支持体のガラス転移点より20℃低い温度以下とし、該帯状プラスチックフィルム支持体の搬送方向と直交する方向の該帯状プラスチックフィルム支持体の単位断面積あたりの張力を0.2〜10MPaとすることを特徴とする塗膜乾燥方法。
(Claim 1)
A coating film in which a solid content is dissolved or dispersed in a solvent is applied onto a continuously conveyed belt-shaped plastic film support to form a coating film, and then the belt-shaped plastic film support having the coating film is transported. In the coating film drying method for obtaining a functional film by evaporating the solvent in the coating film,
While the solid content concentration in the coating film is 80% by volume or less,
The width smoothness of the surface of the belt-shaped plastic film support is 100% or less of the thickness of the coating film of the functional film after drying,
When the solvent in the coating film is evaporated, the temperature of the belt-shaped plastic film support is 30 ° C. or more and 20 ° C. or lower than the glass transition point of the belt-shaped plastic film support, and the transport direction of the belt-shaped plastic film support A coating film drying method, wherein a tension per unit cross-sectional area of the belt-shaped plastic film support in a direction orthogonal to the unit is 0.2 to 10 MPa.

(請求項2)
前記帯状プラスチックフィルム支持体の搬送方向と直交する方向への張力を付加する手段がテンターであることを特徴とする請求項1に記載の塗膜乾燥方法。
(Claim 2)
The coating film drying method according to claim 1, wherein the means for applying tension in a direction perpendicular to the conveying direction of the belt-like plastic film support is a tenter.

(請求項3)
前記帯状プラスチックフィルム支持体の搬送方向と直交する方向への張力を付加する手段がスパイラルロールであることを特徴とする請求項1に記載の塗膜乾燥方法。
(Claim 3)
2. The coating film drying method according to claim 1, wherein the means for applying tension in a direction perpendicular to the conveying direction of the belt-shaped plastic film support is a spiral roll.

(請求項4)
前記帯状プラスチックフィルム支持体の搬送方向と直交する方向への張力を付加する手段がクラウンロールであることを特徴とする請求項1に記載の塗膜乾燥方法。
(請求項5)
連続搬送される帯状プラスチックフィルム支持体上に、溶媒中に固形分を溶解又は分散した塗布液を塗布して塗膜を形成した後、前記塗膜を有する前記帯状プラスチックフィルム支持体を搬送しながら前記塗膜中の溶媒を蒸発させて機能性膜を得る機能性膜の製造方法において、
前記塗膜中の固形分濃度が80体積%以下の間は、
前記帯状プラスチックフィルム支持体の表面の幅手平滑度を、乾燥後の前記機能性膜の塗膜の厚さの100%以下とし、
前記塗膜中の溶媒を蒸発させる時、帯状プラスチックフィルム支持体の温度を30℃以上、該帯状プラスチックフィルム支持体のガラス転移点より20℃低い温度以下とし、該帯状プラスチックフィルム支持体の搬送方向と直交する方向の該帯状プラスチックフィルム支持体の単位断面積あたりの張力を0.2〜10MPaとすることを特徴とする機能性膜の製造方法。
(Claim 4)
The method for drying a coating film according to claim 1, wherein the means for applying tension in a direction perpendicular to the conveying direction of the belt-shaped plastic film support is a crown roll.
(Claim 5)
A coating film in which a solid content is dissolved or dispersed in a solvent is applied onto a continuously conveyed belt-shaped plastic film support to form a coating film, and then the belt-shaped plastic film support having the coating film is transported. In the method for producing a functional film to obtain a functional film by evaporating the solvent in the coating film,
While the solid content concentration in the coating film is 80% by volume or less,
The width smoothness of the surface of the belt-shaped plastic film support is 100% or less of the thickness of the coating film of the functional film after drying,
When the solvent in the coating film is evaporated, the temperature of the belt-shaped plastic film support is 30 ° C. or more and 20 ° C. or lower than the glass transition point of the belt-shaped plastic film support, and the transport direction of the belt-shaped plastic film support A method for producing a functional membrane, wherein a tension per unit cross-sectional area of the belt-shaped plastic film support in a direction orthogonal to the unit is 0.2 to 10 MPa.

発明者らは、上記課題を達成するために鋭意検討を加えた結果、連続搬送される支持体上に塗布液を塗布し、塗膜中の溶媒を除去することで機能性膜を形成する場合、機能性膜の平滑性劣化、膜厚のバラツキ等が発生する原因として、流動性のある状態の塗膜に対して吹き付ける乾燥風の影響の他に、塗膜中の溶媒を除去する時の支持体の温度と外力とによる支持体の変形に伴い発生することが判明した。   As a result of intensive studies to achieve the above-mentioned problems, the inventors apply a coating liquid on a continuously transported support and form a functional film by removing the solvent in the coating film. In addition to the influence of the drying wind sprayed on the coating film in a fluid state, as a cause of the deterioration of the smoothness of the functional film, the film thickness variation, etc., when removing the solvent in the coating film It has been found that this occurs with the deformation of the support due to the temperature and external force of the support.

支持体は一般的に、加熱した状態で張力を掛けると容易に伸ばされ、冷やすと収縮する性質を有している。この支持体の変形に対して、発明者らは鋭意検討を加えた結果、次のことを見出した。   In general, the support has a property of being easily stretched when tension is applied in a heated state and contracting when cooled. As a result of intensive studies on the deformation of the support, the inventors have found the following.

1)塗膜中の溶媒を除去する際、支持体には搬送するための張力と、溶媒を除去するために温度が掛けられることで搬送方向に伸ばされ変形が発生する。   1) When removing the solvent in the coating film, the support is stretched in the transport direction by being applied with a tension for transport and a temperature for removing the solvent, and deformation occurs.

2)支持体上に塗布された塗膜は塗布時に均一に支持体上に形成しても塗膜中の溶媒を蒸発除去するまでに支持体表面に凹凸が発生すると重力や表面張力によるレベルングにより液表面が平滑となりこのまま乾燥固化すると塗膜の厚みが支持体内で異なってしまう。   2) Even if the coating film applied on the support is uniformly formed on the support at the time of application, if unevenness is generated on the surface of the support before the solvent in the coating is evaporated and removed, it is leveled by gravity and surface tension. As a result, the liquid surface becomes smooth, and when it is dried and solidified as it is, the thickness of the coating film differs in the support.

これらの結果より、支持体上の塗膜中の溶媒の蒸発除去する際、加熱中の支持体の変形量を幅方向と搬送方向で出来るだけ少なく、均一にすることで、膜厚安定性、膜平滑性がが改良されることが判明し、本発明に至った次第である。   From these results, when evaporating and removing the solvent in the coating film on the support, the amount of deformation of the support during heating is as small as possible in the width direction and the transport direction, making the film thickness stable, It has been found that the film smoothness is improved and it is up to the present invention.

連続搬送される帯状プラスチックフィルム支持体(以下、支持体とも言う)上に塗布液を塗布して形成した塗膜中の溶媒を蒸発除去する際、より高品質で、より高生産率の機能性膜を作製する塗膜乾燥方法を提供することが出来、高品位で生産性の高い製品の安定生産が可能となった。   When evaporating and removing the solvent in the coating film formed by applying the coating liquid on the belt-shaped plastic film support (hereinafter also referred to as support) that is transported continuously, it has higher quality and higher productivity. A coating film drying method for producing a film could be provided, and stable production of a high-quality and highly productive product became possible.

連続搬送される支持体上に塗布液を塗布して形成した塗膜中の溶媒を蒸発除去する塗布・乾燥装置の模式図である。It is a schematic diagram of a coating / drying apparatus for evaporating and removing a solvent in a coating film formed by coating a coating solution on a continuously conveyed support. 図1に示す塗布・乾燥装置の乾燥ボックスに支持体の支持手段を配設した場合の模式図である。It is a schematic diagram at the time of arrange | positioning the support means of a support body to the drying box of the application | coating and drying apparatus shown in FIG. 図1に示す塗布・乾燥装置の乾燥ボックスに支持体の他の支持手段を配設した場合の模式図である。It is a schematic diagram at the time of arrange | positioning the other support means of a support body in the drying box of the application | coating and drying apparatus shown in FIG.

本発明の実施の形態を図1〜図3を参照して説明するが、本発明はこれに限定されるものではない。   Embodiments of the present invention will be described with reference to FIGS. 1 to 3, but the present invention is not limited thereto.

図1は連続搬送される支持体上に塗布液を塗布して形成した塗膜中の溶媒を蒸発除去する塗布・乾燥装置の模式図である。   FIG. 1 is a schematic view of a coating / drying apparatus for evaporating and removing a solvent in a coating film formed by coating a coating solution on a continuously conveyed support.

図中、1は塗布・乾燥装置を示す。101はバックアップロール102に支持され、連続搬送される支持体103上に塗布液を塗布するダイコータを示す。105は支持体上に塗布された塗膜104a中の溶媒を除去する乾燥ボックスを示す。105aは乾燥ボックス105の入り口を示し、105bは出口を示す。104bは溶媒が除去され支持体103上に形成された機能性膜を示す。106は塗布液調製タンクを示し、送液ポンプ107によりダイコータ101に送る様になっている。108は塗布を安定に行うための減圧室を示す。ダイコータ101としては特に限定はなく、例えばスライド型ダイコータ、エクストルージョン型ダイコータ、カーテン型ダイコータ、カーテンスプレー型ダイコータ等が挙げられ必要に応じて適宜選択が可能となっている。本図はエクストルージョン型ダイコータを使用した場合を示している。尚、塗布方式によっては減圧室108は必要なく、単に未塗布時の液受けとして使用することも可能である。   In the figure, 1 indicates a coating / drying apparatus. Reference numeral 101 denotes a die coater that is supported by a backup roll 102 and applies a coating solution onto a support 103 that is continuously conveyed. Reference numeral 105 denotes a drying box for removing the solvent in the coating film 104a applied on the support. 105a shows the entrance of the drying box 105, and 105b shows the exit. A functional film 104b is formed on the support 103 after the solvent is removed. A coating liquid preparation tank 106 is sent to the die coater 101 by a liquid feed pump 107. Reference numeral 108 denotes a decompression chamber for performing coating stably. The die coater 101 is not particularly limited, and examples thereof include a slide type die coater, an extrusion type die coater, a curtain type die coater, a curtain spray type die coater, and the like, which can be appropriately selected as necessary. This figure shows the case where an extrusion type die coater is used. Depending on the application method, the decompression chamber 108 is not necessary, and it can be used simply as a liquid receiver when not applied.

支持体103上に塗布された塗膜104aは、乾燥ボックス105内で温風を吹き付けることで塗膜104a中の溶媒が蒸発除去され、乾燥ボックス105を出る時点で塗膜104a中の溶媒は実質上除去された状態となっている。乾燥ボックス105で、塗膜104a中の溶媒を蒸発除去する際、塗膜104aが流動性を有している間が塗膜故障が発生し易い区間である。この区間で、支持体103に変形が生じた場合、支持体上に塗布された塗膜104aが塗布時には均一に支持体上に形成しても、重力や表面張力によるレベルングにより塗膜表面が平滑となりこのまま乾燥固化すると機能性膜の厚みが支持体内で異なり、塗膜厚のバラツキが発生してしまう。   The coating film 104a applied on the support 103 is sprayed with warm air in the drying box 105 to evaporate and remove the solvent in the coating film 104a. It has been removed. When the solvent in the coating film 104a is removed by evaporation in the drying box 105, the coating film failure is likely to occur while the coating film 104a has fluidity. In this section, when the support 103 is deformed, even if the coating 104a applied on the support is uniformly formed on the support at the time of application, the surface of the coating 103 is caused by leveling due to gravity or surface tension. When it becomes smooth and dried and solidified as it is, the thickness of the functional film differs within the support, and the coating thickness varies.

発明者らは、鋭意検討を加えた結果、塗膜厚のバラツキが最も発生し易い区間は、塗膜中の固形分濃度が80体積%以下の区間であり、この区間Tで支持体の平滑度を維持することで塗膜厚のバラツキを防止することを見出した。尚、80体積%以下の区間とは、例えば塗布液調製時固形分濃度が50体積%であったものが、塗布後塗膜中の溶媒が蒸発除去されることで体積中に占める固形分濃度が上昇し80体積%となるまでの区間ことを言う。Tは、ある塗布液条件、ある乾燥条件での乾燥ボックス105の入り口105aから入り、乾燥風により加温されることにより、支持体の温度が30℃を越えてから塗膜中の固形分濃度が80体積%以下となるまでの区間を模式的に示したものである。   As a result of diligent investigations, the inventors have found that the section where the coating thickness variation is most likely to occur is a section where the solid content concentration in the coating film is 80% by volume or less. It was found that by maintaining the degree, the coating thickness variation is prevented. The section of 80% by volume or less means, for example, that the solid content concentration at the time of preparing the coating liquid is 50% by volume, and the solid content concentration in the volume is obtained by evaporating and removing the solvent in the coating film after coating. Refers to the interval until the volume rises to 80% by volume. T enters from the entrance 105a of the drying box 105 under a certain coating solution condition and a certain drying condition, and is heated by drying air, so that the solid content concentration in the coating film after the temperature of the support exceeds 30 ° C. FIG. 6 schematically shows a section until 80% by volume or less.

区間Tでの支持体の平面性は次の3通りで規定されている。1)区間Tでの支持体表面の幅手平滑度は、機能性膜の塗膜厚の100%以下であり、より好ましくは50%以下、更に好ましくは10%以下である。区間Tでの支持体表面の幅手平滑度が、機能性膜の塗膜厚の100%を越える場合、支持体上に塗布された塗膜は塗布時に均一に支持体上に形成しても塗膜中の溶媒を蒸発除去するまでに支持体表面に凹凸が発生すると重力や表面張力によるレベルングにより液表面が平滑となりこのまま乾燥固化すると塗膜の厚みが支持体内で異なってしまい、仕上がり機能性膜の塗膜厚のバラツキが発生し、機能性膜の均一性を得ることが出来ないため好ましくない。区間Tでの支持体表面の幅手平滑度を、塗膜厚の100%以下とすることで、塗膜中の溶媒を蒸発除去するまでに支持体表面の凹凸の発生を防止し、仕上がり機能性膜の塗膜厚のバラツキを防止し、機能性膜の均一性を得ることが可能となる。
2)区間Tでの支持体表面の凹凸の隣接する極大点と極小点の距離は、塗膜厚方向の変位量の50〜1×106倍である。50倍未満の場合は、支持体上に塗布された塗膜は塗布時に均一に支持体上に形成しても塗膜中の溶媒を蒸発除去するまでに支持体表面に凹凸が発生すると重力や表面張力によるレベルングにより液表面が平滑となりこのまま乾燥固化すると塗膜の厚みが支持体内で異なってしまい、仕上がり機能性膜の塗膜厚のバラツキが発生し、機能性膜の均一性を得ることが出来ないため好ましくない。1×106倍を越える場合は、プラスチックフィルム支持体の温度を30℃未満に維持する必要があり、塗膜の乾燥時間が長くかかり生産効率が著しく低下するため好ましくない。
3)区間Tでの支持体表面の幅手平滑度は、機能性膜の塗膜厚の100%以下であり、且つ区間Tでの支持体表面の凹凸の隣接する極大点と極小点の距離は、塗膜厚方向の変位量の50〜1×106倍である。
The flatness of the support in the section T is defined by the following three types. 1) The width smoothness of the support surface in the section T is 100% or less, more preferably 50% or less, still more preferably 10% or less of the coating thickness of the functional film. When the width smoothness of the surface of the support in section T exceeds 100% of the coating thickness of the functional film, the coating applied on the support may be uniformly formed on the support at the time of application. If unevenness occurs on the surface of the support before the solvent in the coating is removed by evaporation, the surface of the liquid becomes smooth due to leveling due to gravity and surface tension. The coating thickness of the functional film varies, and the uniformity of the functional film cannot be obtained. By making the width smoothness of the support surface in the section T 100% or less of the coating film thickness, it is possible to prevent the unevenness of the support surface from occurring before the solvent in the coating film is removed by evaporation, and the finished function It is possible to prevent variation in the coating thickness of the functional film and obtain uniformity of the functional film.
2) The distance between the adjacent maximum point and minimum point of the unevenness on the support surface in the section T is 50 to 1 × 10 6 times the amount of displacement in the coating film thickness direction. In the case of less than 50 times, even if the coating film applied on the support is uniformly formed on the support at the time of application, if unevenness is generated on the surface of the support before evaporation of the solvent in the coating, gravity or If the liquid surface becomes smooth due to leveling due to surface tension and is dried and solidified as it is, the thickness of the coating will vary within the support, resulting in variations in the coating thickness of the finished functional membrane, and obtaining the uniformity of the functional membrane It is not preferable because it cannot be done. When it exceeds 1 × 10 6 times, it is necessary to maintain the temperature of the plastic film support at less than 30 ° C., which is not preferred because the drying time of the coating film is long and the production efficiency is remarkably lowered.
3) The width smoothness of the support surface in the section T is 100% or less of the coating thickness of the functional film, and the distance between the adjacent maximum and minimum points on the support surface irregularities in the section T. Is 50 to 1 × 10 6 times the amount of displacement in the coating thickness direction.

区間Tでの支持体の上記1)〜3)に示される平面性を得るための方法は、次の2通りの方法が挙げられる。1)区間Tでの支持体の温度は、搬送張力に伴う変形、乾燥時間等を考慮し、30℃以上、支持体のガラス転移点より20℃低い温度以下とし、支持体の搬送方向の支持体単位断面積あたりの張力を、2〜50MPaとすることが好ましい。搬送方向の張力が2MPa未満の場合は、支持体の搬送性が安定しないため、支持体の幅方向に横段ムラが発生する場合がある。張力が50MPaを越える場合は、新たに支持体に変形が生じる場合がある。2)区間Tでの支持体の温度は、搬送張力に伴う変形、乾燥時間等を考慮し、30℃以上、支持体のガラス転移点より20℃低い温度以下とし、支持体搬送方向と直交する方向の支持体単位断面積あたりの張力を、0.2〜10MPaとすることが好ましい。搬送方向と直交する方向の張力が0.2MPa未満の場合は、支持体の搬送方向の変形を矯正することが不十分となり、塗膜の膜厚バラツキが発生する場合もある。搬送方向と直交する方向の張力が10MPaを越える場合は、新たに支持体に変形が生じる場合がある。 As the method for obtaining the flatness shown in the above 1) to 3) of the support in the section T, the following two methods may be mentioned. 1) The temperature of the support in the section T is set to 30 ° C. or more and 20 ° C. lower than the glass transition point of the support in consideration of deformation due to the transport tension, drying time, etc., and support in the transport direction of the support The tension per body unit cross-sectional area is preferably 2 to 50 MPa. When the tension in the transport direction is less than 2 MPa, the transportability of the support is not stable, and therefore, horizontal unevenness may occur in the width direction of the support. If the tension exceeds 50 MPa, the support may be newly deformed. 2) The temperature of the support in the section T is set to 30 ° C. or more and 20 ° C. or less lower than the glass transition point of the support in consideration of deformation due to transport tension, drying time, etc., and orthogonal to the support transport direction. The tension per support unit cross-sectional area in the direction is preferably 0.2 to 10 MPa. When the tension in the direction orthogonal to the transport direction is less than 0.2 MPa, it is insufficient to correct the deformation of the support in the transport direction, and the coating thickness may vary. When the tension in the direction orthogonal to the transport direction exceeds 10 MPa, the support may be newly deformed.

図2は図1に示す塗布・乾燥装置の乾燥ボックスに支持体の支持手段を配設した場合の模式図である。図2の(a)は支持体の支持手段として、バックアップロールを配設した場合の模式図である。図2の(b)は支持体の支持手段として、コンベアベルトを配設した場合の模式図である。図2の(c)は支持体の支持手段として、プレートを配設した場合の模式図である。図2の(d)は支持体の支持手段として、エアの吹き付け装置を配設した場合の模式図である。   FIG. 2 is a schematic view when the support means for the support is disposed in the drying box of the coating / drying apparatus shown in FIG. FIG. 2A is a schematic view when a backup roll is provided as a support means for the support. FIG. 2B is a schematic view when a conveyor belt is provided as support means for the support. FIG. 2C is a schematic view when a plate is provided as a support means for the support. FIG. 2D is a schematic view when an air blowing device is provided as a support means for the support.

支持体が乾燥ボックス105の入り口105aから入り、乾燥風により加温されることにより、支持体の温度が30℃を越えてから塗膜中の固形分濃度が80体積%以下の区間Tに、搬送方向に張力を付与した状態で、フィルムの平滑性を更に向上させる支持体の支持手段として、変形の起こる位置で裏面から支持体を支持するバックアップロール107、コンベアベルト108、プレート109、空気の吹き付け装置110を配設することが好ましい。勿論、乾燥ボックス105の入り口105aから出口105bの区間に配設してもかまわない。他の符号は図1と同義である。   When the support enters from the entrance 105a of the drying box 105 and is heated by the drying air, after the temperature of the support exceeds 30 ° C., the solid content concentration in the coating film reaches the section T of 80% by volume or less, As a support means for the support that further improves the smoothness of the film with tension applied in the transport direction, a backup roll 107, a conveyor belt 108, a plate 109, an air A spraying device 110 is preferably provided. Of course, you may arrange | position in the area from the entrance 105a of the drying box 105 to the exit 105b. Other reference numerals are the same as those in FIG.

コンベアベルト108は2つ以上の支持ロールに支持されたエンドレスベルトであれば金属やゴムなどどのようなものでも使用出来るが、支持体への傷付きを防止するためにはゴムであることが好ましい。プレート109の場合、動作機構を持たないため最も精密に支持体の位置を規定することが出来る。プレートを使用した場合支持体裏面はプレートと接触しながら移動することになるので擦り傷が生じないように処理する必要がある。例えば、表面の摩擦係数を下げることでフッ素コートなどの樹脂素材を表面にライニング又はプレート自体を樹脂材料とすることである。又、別の方法としてはプレート表面の平面性を平滑とすることである。又別の方法は、プレートと支持体が接触、又は離間する位置でプレートが面取りされていることである。面取りは平面による面取りでもよいが曲率を持つ面取りの方が擦り傷防止には効果が高い。これら3つの方法は随時組み合わせて使用することで擦り傷を防止する効果が高くなることは言うまでもない。   The conveyor belt 108 can be made of any material such as metal or rubber as long as it is an endless belt supported by two or more support rolls, but is preferably rubber in order to prevent damage to the support. . In the case of the plate 109, since it does not have an operation mechanism, the position of the support can be defined most precisely. When a plate is used, the back surface of the support moves while being in contact with the plate, and therefore it is necessary to treat it so as not to cause scratches. For example, by reducing the friction coefficient of the surface, a resin material such as a fluorine coat is used on the surface, or the plate itself is used as the resin material. Another method is to smooth the flatness of the plate surface. Another method is that the plate is chamfered at a position where the plate and the support come into contact with or apart from each other. The chamfering may be a chamfering with a flat surface, but a chamfering with a curvature is more effective in preventing scratches. Needless to say, the effect of preventing scratches is enhanced by using these three methods in combination at any time.

又被塗布体である支持体を支持する他の手段として支持体の裏面からエアを吹き付ける方法が挙げられる。空気の吹き付けは離散型のノズルでもよいし、面保持型の複数の噴出し穴を有するパンチ板や幅手に一様な間隙を有するスリットから支持体裏面へ空気を吹き付けることにより行うことが出来る。又、井上金属(株)製 エアーキャンを使用することも可能である。   Further, as another means for supporting the support body to be coated, there is a method of blowing air from the back surface of the support body. The air may be blown by discrete nozzles or by blowing air from the punch plate having a plurality of face-holding nozzles or a slit having a uniform gap across the width to the back of the support. . It is also possible to use an air can manufactured by Inoue Metal Co., Ltd.

図3は図1に示す塗布・乾燥装置の乾燥ボックスに支持体の他の支持手段を配設した場合の模式図である。   FIG. 3 is a schematic diagram in the case where other support means is provided in the drying box of the coating / drying apparatus shown in FIG.

図中、111は支持体が乾燥ボックス105の入り口105aから入り、乾燥風により加温されることにより、支持体の温度が30℃を越えてから塗膜中の固形分濃度が80体積%以下の区間Tに配設したテンターを示す。テンター111はクリップ状の把持治具により支持体端部を幅手両端で保持し、幅手方向に広げる機構を有しており、これにより区間Tで支持体は幅手方向に張力を付与することが出来、平滑面に保つことが可能となる。   In the figure, reference numeral 111 indicates that the support enters from the entrance 105a of the drying box 105 and is heated by the drying air, so that the solid content concentration in the coating film is 80% by volume or less after the temperature of the support exceeds 30 ° C. The tenter disposed in the section T is shown. The tenter 111 has a mechanism for holding the end portion of the support body at both width ends by a clip-shaped gripping jig and expanding it in the width direction, whereby the support body applies tension in the width direction in the section T. Can be maintained on a smooth surface.

幅手方向に張力を付与する他の手段として、搬送ロールの一部としてスパイラスロール、クラウンロールを用いることも可能である。スパイラルロールは搬送支持ロール表面に回転に伴い支持体を幅手方向に広げるようロール表面に回転軸と傾斜して溝を設けたロールで、ロール全面に溝を設けてもよいし、一部分だけに設けてもよい。これにより乾燥工程で支持体は平滑面に保つことが出来る。クラウンロールは幅手中央部の径が端部の径に比べて太いものである。これにより乾燥工程で支持体は平滑面に保つことが出来る。   As another means for applying tension in the width direction, it is also possible to use a spiral roll or a crown roll as a part of the transport roll. A spiral roll is a roll in which a groove is provided on the surface of the roll so as to spread the support in the width direction with rotation on the surface of the conveyance support roll, and the groove may be provided on the entire surface of the roll. It may be provided. Thereby, a support body can be kept at a smooth surface in a drying process. The crown roll has a thick central width compared to the end diameter. Thereby, a support body can be kept at a smooth surface in a drying process.

図1〜図3を参照しながら説明した如く、支持体が乾燥ボックスの入り口から入り、乾燥風により加温されることにより、支持体の温度が30℃を越えてから塗膜中の固形分濃度が80体積%以下の区間Tで、本発明の乾燥条件により乾燥することで次の効果が得られる。   As described with reference to FIGS. 1 to 3, the support enters from the entrance of the drying box and is heated by the drying air, so that the solid content in the coating after the temperature of the support exceeds 30 ° C. The following effects can be obtained by drying in the section T having a concentration of 80% by volume or less under the drying conditions of the present invention.

1)支持体の平滑度を維持することが可能となり、仕上がり塗膜の膜厚バラツキを防止することが可能となった。   1) It became possible to maintain the smoothness of the support, and to prevent variations in the film thickness of the finished coating film.

2)高品質の塗膜を有する製品の生産が可能になり、LCDや有機EL等に代表される電機光学パネルのデバイス用の塗膜の生産も可能となり適用範囲の拡大が可能となった。   2) Products with high-quality coating films can be produced, and coating films for electro-optical panel devices typified by LCD and organic EL can be produced, thereby expanding the applicable range.

3)高品質化に伴い生産効率の向上が可能となった。   3) The production efficiency can be improved with the improvement of quality.

本発明に係る支持体は、熱により軟化するプラスチックフィルムであれば特に限定はなく、ポリオレフィンフィルム(例えばポリエチレンフィルム、ポリプロピレンフィルムなど)、ポリエステルフィルム(例えば、ポリエチレンテレフタレートフィルム、ポリエチレン2,6−ナフタレートフィルムなど)、ポリアミドフィルム(例えば、ポリエーテルケトンフィルムなど)、セルロースアセテートフィルム(例えば、セルローストリアセテートフィルムなど)などが挙げられる。又、使用する支持体の厚さ、幅、物性等に付いても特に制限はなく、製造する製品に合わせ適宜選択することが可能である。   The support according to the present invention is not particularly limited as long as it is a plastic film that is softened by heat. Polyolefin film (for example, polyethylene film, polypropylene film, etc.), polyester film (for example, polyethylene terephthalate film, polyethylene 2,6-naphthalate) Film), polyamide film (eg, polyetherketone film), cellulose acetate film (eg, cellulose triacetate film), and the like. Moreover, there is no restriction | limiting in particular also about the thickness of a support body to be used, a physical property, etc., It can select suitably according to the product to manufacture.

本発明に係る塗布液はとしては、高分子成分を0.5〜20質量%含んでいることが好ましい。高分子成分としては、ゼラチン、メチルセルロース、カルボキシメチルセルロース、ポリアクリル酸、ポリビニルエーテル、ポリビニルアルコール、ポリビニルピロリドン、天然ゴム等が挙げられる。   The coating liquid according to the present invention preferably contains 0.5 to 20% by mass of a polymer component. Examples of the polymer component include gelatin, methyl cellulose, carboxymethyl cellulose, polyacrylic acid, polyvinyl ether, polyvinyl alcohol, polyvinyl pyrrolidone, and natural rubber.

これらの高分子成分を含んだ塗布液としては特に制限はなく、例えば、一般用及び産業用ハロゲン化銀感光材料、感熱材料、熱現像感光材料、フォトレジスト、LCDや有機EL等に代表される電機光学パネルのデバイス用の塗布液が挙げられる。電気光学パネル用のデバイスとしてはCRTや液晶表示装置の視認性を改善するために、表示装置前面に張り付ける反射防止層が形成された光学フィルム挙げられる。ところで、テレビのような大画面の表示装置では、直接、物が接触することがあり傷が付き易い。そこで、通常は傷つき防止のためにハードコート層を支持体上に形成し、その上に反射防止層が形成されたハードコート層付き反射防止フィルムが用いられる。   The coating liquid containing these polymer components is not particularly limited, and is represented by, for example, general-purpose and industrial silver halide photosensitive materials, heat-sensitive materials, photothermographic materials, photoresists, LCDs, organic ELs, and the like. A coating solution for a device of an electro-optical panel can be mentioned. Examples of the device for the electro-optical panel include an optical film in which an antireflection layer attached to the front surface of the display device is formed in order to improve the visibility of a CRT or a liquid crystal display device. By the way, in a large-screen display device such as a television, an object may come in direct contact with and is easily damaged. Therefore, an antireflection film with a hard coat layer in which a hard coat layer is usually formed on a support for preventing scratches and an antireflection layer is formed thereon is used.

反射防止フィルムの基本的な構成を説明する。例えば、好ましい反射防止フィルムは、透明支持体、ハードコート層、中屈折率層、高屈折率層、低屈折率層の順序の層構成を有する。透明支持体、中屈折率層、高屈折率層及び低屈折率層は、以下の関係を満足する屈折率を有する。低屈折率層の屈折率< 透明支持体の屈折率< 中屈折率層の屈折率< 高屈折率層の屈折率。ハードコート層は、紫外線により硬化する紫外線硬化化合物(樹脂)を含有する層であることが好ましく、耐擦り傷性に優れた反射防止フィルムを得ることが出来る。これら各層の具体的な構成に関しては特開2005−77795に記載されているようなものを使用することが出来る。ただし屈折率層の組み合わせはこれらに限定されるものではなく、他の好ましい反射防止フィルムは、透明支持体、ハードコート層、中屈折率層、低屈折率層の順序の層構成を有する。   The basic configuration of the antireflection film will be described. For example, a preferred antireflection film has a layer structure in the order of a transparent support, a hard coat layer, a medium refractive index layer, a high refractive index layer, and a low refractive index layer. The transparent support, the middle refractive index layer, the high refractive index layer, and the low refractive index layer have a refractive index that satisfies the following relationship. The refractive index of the low refractive index layer <the refractive index of the transparent support <the refractive index of the medium refractive index layer <the refractive index of the high refractive index layer. The hard coat layer is preferably a layer containing an ultraviolet curable compound (resin) that is cured by ultraviolet rays, and an antireflection film excellent in scratch resistance can be obtained. With respect to the specific configuration of each of these layers, those described in JP-A-2005-77795 can be used. However, the combination of the refractive index layers is not limited to these, and another preferable antireflection film has a layer structure in the order of a transparent support, a hard coat layer, a medium refractive index layer, and a low refractive index layer.

以下に本発明の実施例を挙げて具体的に説明するが、本発明の実施態様はこれらの例に限定されるものではない。   Examples of the present invention will be specifically described below, but the embodiments of the present invention are not limited to these examples.

実施例1
(支持体の準備)
厚さ75μm、幅600mm、長さ1000mのポリエチレンテレフタレート(PET)フィルムを準備した。このPETフィルムのガラス転移点は140℃であった。
Example 1
(Preparation of support)
A polyethylene terephthalate (PET) film having a thickness of 75 μm, a width of 600 mm, and a length of 1000 m was prepared. The glass transition point of this PET film was 140 ° C.

(塗布液の調製)
純水にポリビニルアルコールを固形分濃度として、1質量%となるように溶解して塗布液を調製した。この塗布液を、B型粘度計で25℃における粘度を測定したところ5.2mPa・sであった。
(Preparation of coating solution)
A coating liquid was prepared by dissolving polyvinyl alcohol in pure water at a solid content concentration of 1% by mass. When the viscosity of this coating solution at 25 ° C. was measured with a B-type viscometer, it was 5.2 mPa · s.

(塗布)
図1に示す塗布装置を使用した。バックアップロール上に支持された支持体上にエクストルージョンコータを用い、準備した塗布液を減圧押出し塗布により塗布した。支持体の搬送速度は10m/minとし、ウェット膜厚が10μmとなるようにプランジャーポンプによりエクストルージョンコータへ塗布液を供給した。その後塗膜を設けた支持体を連続的に搬送し、塗布工程の下流側に設けられた乾燥工程で表1に示すように、PETフィルムの平滑度を維持する区間の塗膜中の固形分濃度と、PETフィルムの平滑度を変化させ試料を作製しNo.101〜103とした。尚、平滑度の変化は塗膜中の溶媒を蒸発させる時のPETフィルムの温度とPETフィルムの搬送方向の支持体単位断面積あたりの張力を変化することで行った。
(Application)
The coating apparatus shown in FIG. 1 was used. The prepared coating solution was coated on the support supported on the backup roll using an extrusion coater by reduced pressure extrusion coating. The conveying speed of the support was 10 m / min, and the coating liquid was supplied to the extrusion coater by a plunger pump so that the wet film thickness was 10 μm. Thereafter, the support provided with the coating film is continuously conveyed, and as shown in Table 1 in the drying process provided on the downstream side of the coating process, the solid content in the coating film in the section maintaining the smoothness of the PET film Samples were prepared by changing the density and smoothness of the PET film. 101-103. The smoothness was changed by changing the temperature of the PET film when the solvent in the coating film was evaporated and the tension per unit cross-sectional area of the support in the PET film transport direction.

平滑度はキーエンス(株)製 CCDレーザー変位計 LK−G を用い、5cm間隔で支持体幅手に測定した支持体の垂直方向の変形量の最大値と最小値との差とした。乾燥進行に伴う塗膜中の固形分濃度の変化は、オフラインで事前にシート状のフィルムに同液を塗布し、本特許の乾燥条件を再現し溶媒の乾燥過程を再現した時の時間経過と塗膜を含むフィルムの重量の変化から算出した。   The smoothness was defined as the difference between the maximum value and the minimum value of the deformation amount in the vertical direction of the support measured at 5 cm intervals using a CCD laser displacement meter LK-G manufactured by Keyence Corporation. The change in the solid content concentration in the coating film as the drying progresses is the time elapsed when the same liquid was applied to the sheet-like film in advance offline, the drying conditions of this patent were reproduced, and the drying process of the solvent was reproduced. It calculated from the change of the weight of the film containing a coating film.

(評価)
作製した試料No.101〜103に付き、以下に示す方法で塗膜厚のバラツキを測定し、以下に示す評価ランクに従って評価した結果を表1に示す。尚、表中のDはPETフィルムの表面の幅手平滑度を維持する区間終点での塗膜中の固形分濃度を示す。PETフィルムの表面の幅手平滑度は塗膜の厚さに対する%を示す。
(Evaluation)
The prepared sample No. Table 1 shows the results of measuring the variation in the thickness of the coating film according to the method shown below according to the evaluation ranks shown below. In addition, D in a table | surface shows the solid content concentration in the coating film in the area end point which maintains the width smoothness of the surface of PET film. The width smoothness of the surface of the PET film indicates% relative to the thickness of the coating film.

塗膜厚のバラツキ測定方法
塗布開始から100mの十分に安定して加工された試料より、幅方向に20cm角の試料を3枚切り取り、2mm間隔で大塚電子(株)製 光干渉膜厚計 FE−3000を用い、膜厚を測定し、次式により計算で求めた。
Measurement method of coating thickness variation Three samples of 20cm square in the width direction were cut from a sufficiently processed sample of 100m from the start of application. Optical interference film thickness meter FE made by Otsuka Electronics Co., Ltd. at intervals of 2mm. The film thickness was measured using -3000, and was calculated by the following formula.

塗膜厚のバラツキA=(最大膜厚−最小膜厚)/平均膜厚
塗膜厚のバラツキの評価ランク
◎:A≦0.05
○:0.05<A≦0.1
×:0.1<A
Coating thickness variation A = (maximum film thickness−minimum film thickness) / average film thickness Evaluation rank of coating film thickness variation ◎: A ≦ 0.05
○: 0.05 <A ≦ 0.1
×: 0.1 <A

Figure 0005365718
Figure 0005365718

本発明の有効性が確認された。   The effectiveness of the present invention was confirmed.

実施例2
(支持体の準備)
実施例1と同じPETフィルムを準備した。
Example 2
(Preparation of support)
The same PET film as in Example 1 was prepared.

(塗布液の調製)
実施例1と同じ塗布液を調製した。
(Preparation of coating solution)
The same coating solution as in Example 1 was prepared.

(塗布)
図1に示す塗布装置を使用した。バックアップロール上に支持された支持体上にエクストルージョンコータを用い、準備した塗布液を減圧押出し塗布により塗布した。支持体の搬送速度は10m/minとし、ウェット膜厚が10μmとなるようにプランジャーポンプによりエクストルージョンコータコータへ塗布液を供給した。その後塗膜を設けた支持体を連続的に搬送し、塗布工程の下流側に設けられた乾燥工程で表2に示すように、PETフィルムの平面性を維持する区間の塗膜中の固形分濃度と、PETフィルムの平面性を変化させ試料を作製しNo.201〜203とした。尚、平面性の変化は塗膜中の溶媒を蒸発させる時のPETフィルムの温度とPETフィルムの搬送方向の支持体単位断面積あたりの張力を変化することで行った。
(Application)
The coating apparatus shown in FIG. 1 was used. The prepared coating solution was coated on the support supported on the backup roll using an extrusion coater by reduced pressure extrusion coating. The conveying speed of the support was 10 m / min, and the coating liquid was supplied to the extrusion coater coater by a plunger pump so that the wet film thickness was 10 μm. Thereafter, the support provided with the coating film is continuously conveyed, and as shown in Table 2 in the drying process provided on the downstream side of the coating process, the solid content in the coating film in the section for maintaining the flatness of the PET film Samples were prepared by changing the concentration and the flatness of the PET film. 201-203. The flatness was changed by changing the temperature of the PET film when the solvent in the coating film was evaporated and the tension per unit cross-sectional area of the support in the PET film transport direction.

具体的にはPETフィルムの表面の凹凸の隣接する極大点と極小点の距離の割合を言う。PETフィルムの表面凹凸の変位量測定は、キーエンス(株)製 CCDレーザー変位計 LK−Gを用い、支持体幅手中央の20cmの間隔を幅手方向に連続的に測定することにより行い、これにより得られたプロフィールから決定された隣接する極大点と極小点との垂直方向距離に対する水平方向距離の比を平面性とした時、測定範囲内で最も小さい値となるものを評価値(表中のFを示す)とした。尚、平滑度及び塗膜中の固形分濃度は実施例1と同じ方法で測定した。   Specifically, it refers to the ratio of the distance between the adjacent maximum and minimum points on the surface of the PET film. The measurement of the displacement of the surface irregularities of the PET film is performed by continuously measuring the distance of 20 cm in the center of the width of the support in the width direction using a CCD laser displacement meter LK-G manufactured by Keyence Corporation. When the ratio of the horizontal distance to the vertical distance between adjacent local maxima and minima determined from the profile obtained from the above is defined as flatness, the evaluation value (in the table) is the smallest value in the measurement range. Of F). The smoothness and the solid content concentration in the coating film were measured by the same method as in Example 1.

(評価)
作製した試料No.201〜203に付き、塗膜厚のバラツキを実施例1と同じ方法で測定し、実施例1と同じ評価ランクに従って評価した結果を表2に示す。尚、表中のEはPETフィルムの表面の平面性を維持する区間の塗膜中の固形分濃度(体積%)を示す。表中のFは、PETフィルムの表面の隣接する凹凸の極大点と極小点の垂直方向の距離に対する水平方向の距離を示す。
(Evaluation)
The prepared sample No. Table 2 shows the results obtained by measuring the variation in the coating film thickness by the same method as in Example 1 and evaluating according to the same evaluation rank as in Example 1. In the table, E represents the solid content concentration (% by volume) in the coating film in the section where the planarity of the surface of the PET film is maintained. F in the table indicates the distance in the horizontal direction with respect to the distance in the vertical direction between the maximum point and the minimum point of the adjacent unevenness on the surface of the PET film.

Figure 0005365718
Figure 0005365718

本発明の有効性が確認された。   The effectiveness of the present invention was confirmed.

実施例3
実施例1で作製した試料No.101を作製する時、塗膜中の溶媒を蒸発する時のPETフィルムの温度と、PETフィルム搬送方向のPETフィルムの単位断面積あたりの張力を表3に示すように変化した他は同じ条件で試料を作製しNo.301〜310とした。
Example 3
Sample No. 1 prepared in Example 1 was used. When producing 101, the temperature of the PET film when the solvent in the coating film was evaporated and the tension per unit cross-sectional area of the PET film in the PET film transport direction were changed as shown in Table 3 under the same conditions. A sample was prepared and no. 301 to 310.

評価
作製した試料No.301〜311に付き、塗膜厚のバラツキ、横段ムラに付き以下の方法により測定し、以下に示す評価ランクに従って評価した結果を表3に示す。塗膜厚のバラツキは実施例1と同じ方法で測定し、実施例1と同じ評価ランクに従って評価した。横段ムラは、塗布先頭から100mの十分に安定して加工された試料を、目視により幅方向の段状のムラの有無を観察した。
Evaluation The produced sample No. Table 3 shows the results of the measurement according to the following evaluation ranks, which are measured by the following method, with respect to 301 to 311 and with respect to coating thickness variation and lateral unevenness. The coating thickness variation was measured by the same method as in Example 1 and evaluated according to the same evaluation rank as in Example 1. As for horizontal step unevenness, the presence or absence of stepwise unevenness in the width direction was visually observed on a sample processed sufficiently stably 100 m from the top of application.

横段ムラの評価ランク
○:横段ムラの発生がない
△:実技上問題とならない僅かな横段ムラの発生が認められる
×:横段ムラが多発している
Evaluation rank of horizontal unevenness ○: No occurrence of horizontal unevenness △: Slight horizontal unevenness that does not cause a practical problem is observed ×: Many horizontal unevennesses occur

Figure 0005365718
Figure 0005365718

試料No.308は乾燥不良となり、試料の作製が出来なかった。乾燥を終了させるには乾燥ボックスを長くする必要があり設備の改造を必要とする。本発明の有効性が確認された。   Sample No. 308 was poorly dried and the sample could not be prepared. To finish drying, it is necessary to lengthen the drying box and to modify the equipment. The effectiveness of the present invention was confirmed.

実施例4
実施例1で作製した試料No.101を作製する時、図2の(a)に示す様に乾燥ボックス中にPETフィルムの平滑度を維持する区間にPETフィルムの支持手段として、直径150mmのバックアップロールを160mm間隔で5本配設し、送方向のPETフィルムの単位断面積あたりの張力を表4に示すように変化した他は同じ条件で試料を作製しNo.401〜407とした。
Example 4
Sample No. 1 prepared in Example 1 was used. When producing 101, as shown in FIG. 2 (a), five backup rolls with a diameter of 150 mm are arranged at intervals of 160 mm as a means for supporting the PET film in a section that maintains the smoothness of the PET film in the drying box. A sample was prepared under the same conditions except that the tension per unit cross-sectional area of the PET film in the feeding direction was changed as shown in Table 4. 401 to 407.

評価
作製した試料No.401〜407に付き、塗膜厚のバラツキ、横段ムラに付き評価をした結果を表4に示す。尚、塗膜厚のバラツキは実施例1と同じ方法で測定し、実施例1と同じ評価ランクに従って評価し、横段ムラは実施例3と同じ方法で測定し、実施例3と同じ評価ランクに従って評価した。
Evaluation The produced sample No. Table 4 shows the results of evaluations on variations in coating thickness and lateral unevenness on 401 to 407. The coating thickness variation was measured by the same method as in Example 1, and evaluated according to the same evaluation rank as in Example 1. The horizontal unevenness was measured by the same method as in Example 3, and the same evaluation rank as in Example 3. Evaluated according to.

Figure 0005365718
Figure 0005365718

本発明の有効性が確認された。   The effectiveness of the present invention was confirmed.

実施例5
実施例1で作製した試料No.101を作製する時、図2の(b)に示す様に乾燥ボックス中にPETフィルムの平滑度を維持する区間にPETフィルムの支持手段として、ブチルゴム製のコンベアベルトを配設し、搬送方向のPETフィルムの単位断面積あたりの張力を表5に示すように変化した他は同じ条件で試料を作製しNo.501〜507とした。
Example 5
Sample No. 1 prepared in Example 1 was used. When producing 101, as shown in FIG. 2 (b), a conveyor belt made of butyl rubber is disposed as a means for supporting the PET film in a section that maintains the smoothness of the PET film in the drying box, A sample was prepared under the same conditions except that the tension per unit cross-sectional area of the PET film was changed as shown in Table 5. 501-507.

評価
作製した試料No.501〜507に付き、塗膜厚のバラツキ、横段ムラに付き評価をした結果を表5に示す。尚、塗膜厚のバラツキは実施例1と同じ方法で測定し、実施例1と同じ評価ランクに従って評価し、横段ムラは実施例3と同じ方法で測定し、実施例3と同じ評価ランクに従って評価した。
Evaluation The produced sample No. Table 5 shows the results of evaluations on 501 to 507, and evaluations on variations in coating film thickness and lateral unevenness. The coating thickness variation was measured by the same method as in Example 1, and evaluated according to the same evaluation rank as in Example 1. The horizontal unevenness was measured by the same method as in Example 3, and the same evaluation rank as in Example 3. Evaluated according to.

Figure 0005365718
Figure 0005365718

本発明の有効性が確認された。   The effectiveness of the present invention was confirmed.

実施例6
実施例1で作製した試料No.101を作製する時、
図2の(c)に示す様に乾燥ボックス中にPETフィルムの平滑度を維持する区間にPETフィルムの支持手段として、表面をフッ素樹脂で加工したプレートを配設し、搬送方向のPETフィルムの単位断面積あたりの張力を表6に示すように変化した他は同じ条件で試料を作製しNo.601〜607とした。
Example 6
Sample No. 1 prepared in Example 1 was used. When making 101,
As shown in FIG. 2 (c), a plate whose surface is processed with a fluororesin is disposed as a PET film support means in a section where the smoothness of the PET film is maintained in the drying box, and the PET film in the transport direction is arranged. A sample was prepared under the same conditions except that the tension per unit cross-sectional area was changed as shown in Table 6. 601-607.

評価
作製した試料No.601〜607に付き、塗膜厚のバラツキ、横段ムラに付き評価をした結果を表6に示す。尚、塗膜厚のバラツキは実施例1と同じ方法で測定し、実施例1と同じ評価ランクに従って評価し、横段ムラは実施例3と同じ方法で測定し、実施例3と同じ評価ランクに従って評価した。
Evaluation The produced sample No. Table 6 shows the results of evaluation on 601 to 607 and evaluations on coating thickness variation and lateral unevenness. The coating thickness variation was measured by the same method as in Example 1, and evaluated according to the same evaluation rank as in Example 1. The horizontal unevenness was measured by the same method as in Example 3, and the same evaluation rank as in Example 3. Evaluated according to.

Figure 0005365718
Figure 0005365718

本発明の有効性が確認された。   The effectiveness of the present invention was confirmed.

実施例7
実施例1で作製した試料No.101を作製する時、図2の(d)に示す様に乾燥ボックス中にPETフィルムの平滑度を維持する区間にPETフィルムの支持手段として、3mm幅のスリットを3cm間隔で空気の吹き付装置を配設し、搬送方向のPETフィルムの単位断面積あたりの張力を表7に示すように変化した他は同じ条件で試料を作製しNo.801〜807とした。尚、空気の吹き付けは、吹き出し口位置での風速が5m/sとなるようにした。
Example 7
Sample No. 1 prepared in Example 1 was used. When producing 101, as shown in FIG. 2 (d), as a means for supporting the PET film in the section for maintaining the smoothness of the PET film in the drying box, a 3 mm wide slit is blown at an interval of 3 cm. A sample was prepared under the same conditions except that the tension per unit cross-sectional area of the PET film in the transport direction was changed as shown in Table 7. 801 to 807. The air was blown so that the wind speed at the outlet was 5 m / s.

評価
作製した試料No.701〜707に付き、塗膜厚のバラツキ、横段ムラに付き評価をした結果を表7に示す。尚、塗膜厚のバラツキは実施例1と同じ方法で測定し、実施例1と同じ評価ランクに従って評価し、横段ムラは実施例3と同じ方法で測定し、実施例3と同じ評価ランクに従って評価した。
Evaluation The produced sample No. Table 7 shows the results of evaluation on 701 to 707, and evaluation on variations in coating film thickness and lateral unevenness. The coating thickness variation was measured by the same method as in Example 1, and evaluated according to the same evaluation rank as in Example 1. The horizontal unevenness was measured by the same method as in Example 3, and the same evaluation rank as in Example 3. Evaluated according to.

Figure 0005365718
Figure 0005365718

本発明の有効性が確認された。   The effectiveness of the present invention was confirmed.

実施例8
実施例1で作製した試料No.101を作製する時、塗膜中の溶媒を蒸発する時のPETフィルムの温度と、PETフィルムの搬送方向と直交する方向のPETフィルムの単位断面積あたりの張力を表8に示すように変化した他は同じ条件で試料を作製しNo.801〜814とした。尚、張力の変化は図3に示す様なテンターを使用して行った。
Example 8
Sample No. 1 prepared in Example 1 was used. When producing 101, the temperature of the PET film when the solvent in the coating film was evaporated and the tension per unit cross-sectional area of the PET film in the direction perpendicular to the direction of transport of the PET film were changed as shown in Table 8. Other samples were prepared under the same conditions, and No. 801-814. The tension was changed using a tenter as shown in FIG.

評価
作製した試料No.801〜814に付き、塗膜厚のバラツキを実施例1と同じ方法で測定し、実施例1と同じ評価ランクに従って評価した結果を表8に示す。
Evaluation The produced sample No. Table 8 shows the results obtained by measuring variations in the coating film thickness by the same method as in Example 1 and evaluating according to the same evaluation rank as in Example 1.

Figure 0005365718
試料No.808は乾燥不良となり、試料の作製が出来なかった。乾燥を終了させるには乾燥ボックスを長くする必要があり設備の改造を必要とする。本発明の有効性が確認された。
Figure 0005365718
Sample No. No. 808 was poorly dried and the sample could not be prepared. To finish drying, it is necessary to lengthen the drying box and to modify the equipment. The effectiveness of the present invention was confirmed.

実施例9
実施例8において、テンターの代わりに直径150mmのスパイラルロールを使用し、溝の本数と角度を変え搬送方向と直交する方向の張力を実施例8と同じに変えて試料を作製し、塗膜厚のバラツキを評価した結果、表8に示す結果と同じ結果を得た。
Example 9
In Example 8, a spiral roll having a diameter of 150 mm was used instead of the tenter, the number and angle of the grooves were changed, the tension in the direction perpendicular to the conveying direction was changed to the same as in Example 8, and a sample was prepared. As a result of evaluating the variation, the same results as shown in Table 8 were obtained.

実施例10
実施例8において、テンターに代わり、中央径170mm、両端径150mm、長さ1100mmのクラウンロール使用し、中央の径と端部の径を変え搬送方向と直交する方向の張力を実施例8と同じに変えて試料を作製し、塗膜厚のバラツキを評価した結果、表8に示す結果と同じ結果を得た。
Example 10
In Example 8, instead of the tenter, a crown roll having a center diameter of 170 mm, both end diameters of 150 mm, and a length of 1100 mm was used, and the tension in the direction perpendicular to the conveying direction was changed by changing the center diameter and the end diameter. As a result of preparing samples and evaluating variations in coating film thickness, the same results as shown in Table 8 were obtained.

1 塗布・乾燥装置
101 ダイコータ
102、107 バックアップロール
103 支持体
104a 塗膜
104b 機能性膜
105 乾燥ボックス
108 コンベアベルト
109 プレート
110 吹き付け装置
111 テンター
T 区間
DESCRIPTION OF SYMBOLS 1 Application | coating and drying apparatus 101 Die coater 102, 107 Backup roll 103 Support body 104a Coating film 104b Functional film 105 Drying box 108 Conveyor belt 109 Plate 110 Spraying apparatus 111 Tenter T Section

Claims (5)

連続搬送される帯状プラスチックフィルム支持体上に、溶媒中に固形分を溶解又は分散した塗布液を塗布して塗膜を形成した後、前記塗膜を有する前記帯状プラスチックフィルム支持体を搬送しながら前記塗膜中の溶媒を蒸発させて機能性膜を得る塗膜乾燥方法において、
前記塗膜中の固形分濃度が80体積%以下の間は、
前記帯状プラスチックフィルム支持体の表面の幅手平滑度を、乾燥後の前記機能性膜の塗膜の厚さの100%以下とし、
前記塗膜中の溶媒を蒸発させる時、帯状プラスチックフィルム支持体の温度を30℃以上、該帯状プラスチックフィルム支持体のガラス転移点より20℃低い温度以下とし、該帯状プラスチックフィルム支持体の搬送方向と直交する方向の該帯状プラスチックフィルム支持体の単位断面積あたりの張力を0.2〜10MPaとすることを特徴とする塗膜乾燥方法。
A coating film in which a solid content is dissolved or dispersed in a solvent is applied onto a continuously conveyed belt-shaped plastic film support to form a coating film, and then the belt-shaped plastic film support having the coating film is transported. In the coating film drying method for obtaining a functional film by evaporating the solvent in the coating film,
While the solid content concentration in the coating film is 80% by volume or less,
The width smoothness of the surface of the belt-shaped plastic film support is 100% or less of the thickness of the coating film of the functional film after drying,
When the solvent in the coating film is evaporated, the temperature of the belt-shaped plastic film support is 30 ° C. or more and 20 ° C. or lower than the glass transition point of the belt-shaped plastic film support, and the transport direction of the belt-shaped plastic film support A coating film drying method, wherein a tension per unit cross-sectional area of the belt-shaped plastic film support in a direction orthogonal to the unit is 0.2 to 10 MPa.
前記帯状プラスチックフィルム支持体の搬送方向と直交する方向への張力を付加する手段がテンターであることを特徴とする請求項1に記載の塗膜乾燥方法。   The coating film drying method according to claim 1, wherein the means for applying tension in a direction perpendicular to the conveying direction of the belt-like plastic film support is a tenter. 前記帯状プラスチックフィルム支持体の搬送方向と直交する方向への張力を付加する手段がスパイラルロールであることを特徴とする請求項1に記載の塗膜乾燥方法。   2. The coating film drying method according to claim 1, wherein the means for applying tension in a direction perpendicular to the conveying direction of the belt-shaped plastic film support is a spiral roll. 前記帯状プラスチックフィルム支持体の搬送方向と直交する方向への張力を付加する手段がクラウンロールであることを特徴とする請求項1に記載の塗膜乾燥方法。   The method for drying a coating film according to claim 1, wherein the means for applying tension in a direction perpendicular to the conveying direction of the belt-shaped plastic film support is a crown roll. 連続搬送される帯状プラスチックフィルム支持体上に、溶媒中に固形分を溶解又は分散した塗布液を塗布して塗膜を形成した後、前記塗膜を有する前記帯状プラスチックフィルム支持体を搬送しながら前記塗膜中の溶媒を蒸発させて機能性膜を得る機能性膜の製造方法において、A coating film in which a solid content is dissolved or dispersed in a solvent is applied onto a continuously conveyed belt-shaped plastic film support to form a coating film, and then the belt-shaped plastic film support having the coating film is transported. In the method for producing a functional film to obtain a functional film by evaporating the solvent in the coating film,
前記塗膜中の固形分濃度が80体積%以下の間は、  While the solid content concentration in the coating film is 80% by volume or less,
前記帯状プラスチックフィルム支持体の表面の幅手平滑度を、乾燥後の前記機能性膜の塗膜の厚さの100%以下とし、  The width smoothness of the surface of the belt-shaped plastic film support is 100% or less of the thickness of the coating film of the functional film after drying,
前記塗膜中の溶媒を蒸発させる時、帯状プラスチックフィルム支持体の温度を30℃以上、該帯状プラスチックフィルム支持体のガラス転移点より20℃低い温度以下とし、該帯状プラスチックフィルム支持体の搬送方向と直交する方向の該帯状プラスチックフィルム支持体の単位断面積あたりの張力を0.2〜10MPaとすることを特徴とする機能性膜の製造方法。  When the solvent in the coating film is evaporated, the temperature of the belt-shaped plastic film support is 30 ° C. or more and 20 ° C. or lower than the glass transition point of the belt-shaped plastic film support, and the transport direction of the belt-shaped plastic film support A method for producing a functional membrane, wherein a tension per unit cross-sectional area of the belt-shaped plastic film support in a direction orthogonal to the unit is 0.2 to 10 MPa.
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