KR20200004526A - Manufacturing method of uv paint coating layer on film - Google Patents

Manufacturing method of uv paint coating layer on film Download PDF

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KR20200004526A
KR20200004526A KR1020180077459A KR20180077459A KR20200004526A KR 20200004526 A KR20200004526 A KR 20200004526A KR 1020180077459 A KR1020180077459 A KR 1020180077459A KR 20180077459 A KR20180077459 A KR 20180077459A KR 20200004526 A KR20200004526 A KR 20200004526A
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film
coating layer
coating
curing
paint
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KR1020180077459A
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Korean (ko)
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KR102183226B1 (en
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여인식
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주식회사 유비테크
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/007—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/061—Special surface effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Disclosed by the present invention is a method for forming a UV curing coating layer of a film. The method for forming a UV curing coating layer of a film according to the present invention includes: a UV paint coating step of coating UV paint on the surface of a film; a UV paint polarizing step of polarizing UV paint by applying a direct current high voltage in a range capable of polarizing the UV paint on the UV paint coated on the film before curing; and a UV curing coating layer forming step of forming a UV curing coating layer by irradiating UV light to the polarized UV paint coated on the film surface. The present invention: uniformizes the thickness of an UV curing coating layer; smoothens the surface of the UV curing coating layer without irregularities; and increases transparency by removing the diffuse reflection of light from the surface of the UV curing coating layer.

Description

필름의 UV경화코팅층 형성 방법{MANUFACTURING METHOD OF UV PAINT COATING LAYER ON FILM}UV curing coating layer formation method of film {MANUFACTURING METHOD OF UV PAINT COATING LAYER ON FILM}

본 발명은 필름의 UV경화코팅층 형성 방법에 관한 것으로, 더 상세하게는 PET필름 등의 합성수지 필름 표면에 UV 도료를 코팅하고 경화시켜 UV경화코팅층을 형성함에 있어서, UV경화코팅층의 두께를 균일하게 하고, UV경화코팅층의 표면을 요철 없이 평활하게 할 뿐만 아니라, UV경화코팅층 표면에서 빛의 난반사를 제거하여 투명성을 높일 수 있는 UV경화코팅층 형성 방법에 관한 것이다.
The present invention relates to a method of forming a UV cured coating layer of a film, and more particularly, in forming a UV cured coating layer by coating and curing a UV paint on the surface of a synthetic resin film such as PET film, and makes the thickness of the UV cured coating layer uniform. In addition, the surface of the UV-curable coating layer is not only smooth, but also relates to a method of forming a UV-curable coating layer that can increase the transparency by removing the diffuse reflection of light from the surface of the UV-curable coating layer.

종래, PET 필름, PVC 필름, PE 필름, PP 필름 등의 필름 표면에 UV도료를 코팅하여 필름의 표면 경도, 내스크래치성, 내약품성 및 광택을 개선하는 방법이 알려져 있다.
Conventionally, a method of improving the surface hardness, scratch resistance, chemical resistance and gloss of a film by coating a UV coating on the surface of a film such as a PET film, a PVC film, a PE film, and a PP film is known.

그 예로, 한국 공개특허공보 제10-2000-0021807는 자외선 경화형 조성물 및 이를 이용한 하드코트 필름을 개시하고 있다. 한국 공개특허공보 제10-2000-0021807에는, 조성물의 총중량을 기준으로 하여, 자외선 경화형 아크릴레이트계 올리고머 30 ~ 90중량%, 자외선 반응성 희석제 1 ~ 30중량%, 광중합 개시제 0.1 ~ 10중량%, 레벨링제 0.05 ~ 20중량%, 광학특성조절제 0.1 ~ 70중량% 및 나머지량의 용제를 포함하는 자외선 경화형 조성물을 필름에 코팅함으로써, 내스크래치성, 내약품성, 내용제성, 내열성, 엠보싱 부분의 내구성이 우수하고, 인쇄잉크에 대한 적성이 탁월하며, 표면광택이 낮고 광투과율이 높으면서 차폐성이 뛰어난 광학특성이 있으며, 대전방지성이 우수하여 내오염성도 우수한 필름을 얻을 수 있다고 설명되어 있다.
For example, Korean Patent Laid-Open Publication No. 10-2000-0021807 discloses an ultraviolet curable composition and a hard coat film using the same. Korean Laid-Open Patent Publication No. 10-2000-0021807, based on the total weight of the composition, UV curable acrylate oligomer 30 to 90% by weight, UV reactive diluent 1 to 30% by weight, photopolymerization initiator 0.1 to 10% by weight, leveling Excellent scratch resistance, chemical resistance, solvent resistance, heat resistance, embossed portion by coating the film with a UV curable composition comprising 0.05 to 20% by weight, 0.1 to 70% by weight of the optical property control agent and the remaining amount of the solvent to the film In addition, the film has excellent aptitude for printing ink, low surface gloss, high light transmittance, excellent optical shielding property, excellent antistatic property, and excellent stain resistance.

일반적으로, 자외선 경화 도료(이하, UV도료라고 함)는 필름에 도포함에 있어서는, 롤러 코터, 커튼 플로우 코터, 또는 스프레이를 사용한다. 또한 필름에 도포된 UV도료를 경화(curing)시킴에 있어서는 자외선 램프를 구비한 자외선 경화 장치를 사용한다.
In general, an ultraviolet curable paint (hereinafter referred to as a UV paint) uses a roller coater, a curtain flow coater, or a spray when applying to a film. In curing the UV coating applied to the film, an ultraviolet curing device equipped with an ultraviolet lamp is used.

롤러 코터, 커튼 플로우 코터, 또는 스프레이를 사용하여 필름 표면에 UV도료를 도포할 경우, UV도료의 유동성으로 인하여 도포 두께가 불균일하고, 표면이 평활하지 않을 뿐만 아니라, 표면에서 빛의 난반사로 인하여 투명성이 저감된다. 이러한 상태에서 UV도료가 도포된 필름을 그대로 자외선 경화 장치에 투입하여 자외선 경화 처리를 할 경우, UV경화코팅층을 갖는 필름의 두께가 불균일할 뿐만 아니라 표면 의 조도(粗度)가 낮고 투명성도 저감된다.
When UV paint is applied to the film surface using a roller coater, curtain flow coater, or spray, the coating thickness is uneven due to the flowability of the UV paint, the surface is not smooth, and transparency is caused by the diffuse reflection of light on the surface. This is reduced. In this state, when the film coated with UV coating is put into the UV curing device as it is, UV curing treatment is not only uniform in thickness of the film having the UV curing coating layer, but also low surface roughness and transparency is reduced. .

한국 공개특허공보 공개번호 제10-2000-0021807호(공개일 : 2000.04.25)Korean Laid-Open Patent Publication No. 10-2000-0021807 (published date: April 25, 2000)

본 발명은 상술한 종래 UV경화코팅층을 갖는 필름의 문제점을 해결하기 위하여 이루어진 것으로, 본 발명이 해결하고자 하는 제1과제는, UV경화코팅층의 두께를 균일하게 할 수 있는 필름의 UV경화코팅층 형성 방법을 제공하는 데 있다.
The present invention is made to solve the problems of the film having a conventional UV curing coating layer described above, the first problem to be solved by the present invention, UV curing coating layer forming method of the film which can make the thickness of the UV curing coating layer uniform To provide.

본 발명이 해결하고자 하는 제2과제는, UV경화코팅층의 표면이 평활하고 매끄러운 필름의 UV경화코팅층 형성 방법을 제공하는 데 있다.
A second object of the present invention is to provide a method of forming a UV cured coating layer of a film having a smooth and smooth surface of the UV cured coating layer.

본 발명이 해결하고자 하는 제3과제는, UV경화코팅층의 빛 난반사를 제거하여 투명성을 높일 수 있는 필의 UV경화코팅층 형성 방법을 제공하는 데 있다.
The third problem to be solved by the present invention is to provide a method of forming a UV curing coating layer of the peel to improve the transparency by removing the light reflection of the UV curing coating layer.

상술한 본 발명의 과제들은, 필름 표면에 UV도료를 도포하는 UV도료 도포 단계와, 필름에 도포된 경화전 UV도료에 UV도료가 분극화될 수 있는 범위의 직류 고전압을 가하여 UV도료를 분극화(polarization)하는 UV도료 분극화 단계와, 필름 표면에 도포된 분극화된 UV도료에 UV를 조사하여 UV경화코팅층을 형성하는 UV경화코팅층 형성 단계를 포함하는 필름의 UV경화코팅층 형성 방법에 의하여 해결할 수 있다.
The above object of the present invention, the UV coating step of applying a UV coating on the surface of the film, and polarizing the UV coating by applying a direct current high voltage in the range that the UV coating can be polarized to the UV coating before curing applied to the film UV coating polarization step, and a UV curing coating layer forming step of forming a UV curing coating layer to form a UV curing coating layer by irradiating UV to the polarized UV coating applied to the film surface can be solved.

상기 UV도료 도포 단계와, UV도료 도포층 분극화 단계와, UV경화코팅층 형성단계는 연속 공정에 의하여 이루어진다.
The UV paint coating step, UV coating layer polarization step, UV curing coating layer forming step is made by a continuous process.

상기 직류 고전압은 20KV/cm ~ 40KV/cm의 전계를 형성하는 직류 고전압을 사용한다.
The direct current high voltage uses a direct current high voltage which forms an electric field of 20 KV / cm to 40 KV / cm.

본 발명에 의하면, UV경화코팅층의 두께를 균일하게 하고, UV경화코팅층의 표면을 요철 없이 평활하게 할 뿐만 아니라, UV경화코팅층 표면에서 빛의 난반사를 제거하여 투명성을 높여주는 효과가 있다.
According to the present invention, the thickness of the UV cured coating layer is uniform, and the surface of the UV cured coating layer is smoothed without irregularities, and the transparency of the UV cured coating layer is removed by removing the diffused reflection of the light.

도 1은 본 발명에 따른 필름의 UV경화코팅층 형성 방법의 공정도이다.
도 2는 본 발명에 따른 필름의 UV경화코팅층 형성 방법의 각 공정에 사용되는 장치의 구성도이다. 1 is a process chart of the UV curing coating layer forming method of the film according to the present invention.
Figure 2 is a block diagram of a device used in each step of the UV curing coating layer forming method of the film according to the present invention.

이하, 첨부한 도면을 참조하여 본 발명에 따른 필름의 UV경화코팅층 형성 방법에 대한 구체적인 실시 예를 상세히 설명한다.
Hereinafter, with reference to the accompanying drawings will be described in detail a specific embodiment of the UV curing coating layer forming method of the film according to the present invention.

도 1 및 도 2에 도시된 바와 같이, 본 발명에 따른 필름의 UV경화코팅층 형성 방법은 필름(1)상에 UV도료(118)를 도포하는 UV도료 도포 장치(100)와, 필름상에 도포된 UV도료(2a)를 UV경화 처리하기 전에 분극화시키는 UV도료 분극화 장치(120)와, 분극화된 UV도료(2b)를 자외선을 조사하여 경화(curing)시켜 UV경화코팅층(2c)을 형성하는 UV도료 경화 장치(140)를 사용한다.
As shown in Figure 1 and Figure 2, the method of forming a UV curing coating layer of the film according to the present invention is applied to the UV coating device 100 and the film coating UV coating 118 on the film (1) UV coating polarizing device 120 for polarizing the UV coating (2a) before the UV curing treatment, and UV curing the polarized UV coating (2b) by curing the UV (curing) to form a UV curing coating layer (2c) The paint curing apparatus 140 is used.

본 발명에 따른 필름의 UV경화코팅층 형성 방법은, 상기 UV도료 도포 장치(100)에 의하여 필름(1) 표면에 UV도료(118)를 도포하는 UV도료 도포 단계와, 상기 UV도료 분극화 장치(120)에 의하여 필름(1)에 도포된 경화전 UV도료(2a)에 UV도료(2a)가 분극화될 수 있는 범위의 직류 고전압을 가하여 UV도료(2a)를 분극화(polarization)하는 UV도료 분극화 단계와, 필름(1) 표면에 도포된 분극화된 UV도료(2b)에 UV도료 경화 장치(140)에 의하여 UV를 조사하여 UV경화코팅층(2c)을 형성하는 UV경화코팅층 형성 단계를 포함한다.
UV curing coating layer forming method of the film according to the present invention, the UV paint coating step of applying a UV paint 118 to the surface of the film (1) by the UV coating device 100, and the UV coating polarization device 120 UV coating polarization step of polarizing the UV coating (2a) by applying a direct current high voltage in the range that the UV coating (2a) can be polarized to the pre-curing UV coating (2a) applied to the film (1) by , UV curing coating the polarized UV coating (2b) applied to the surface of the film (1) by the UV paint curing device 140 to form a UV curing coating layer (2c) to form a UV curing coating layer (2c).

상기 필름(1)은 PET 필름, PVC 필름, PE 필름, PP 필름 등의 합성수지 필름이다.
The film 1 is a synthetic resin film such as PET film, PVC film, PE film, PP film.

상기 UV도료(118)는 올리고머(프리폴리머), 반응성 희석제(관능성 모노머) 및 광개시제를 포함한다. 광개시제는 자외선(UV)을 받아 라디컬을 발생시키거나 양이온 결합을 촉진하여 올리고머(oligomer)와 반응성 희석제(monomer)의 중합 및 가교를 통해 경화를 진행시킨다. 올리고머로는 불포화폴리에스테르, 에폭시 아크릴레이트, 우레탄 아크릴레이트, 아크릴 아크릴레이트, 폴리에스터 아크릴레이트 등을 사용할 수 있다. 상기 반응성 희석제(monomer)로는 스틸렌, 비닐톨루엔, 다양한 종류의 아크릴계 모노머, 비닐 모노머 등을 사용할 수 있다. 광개시제로는 α-하이드록시 알킬페논, 벤조인 에테르, 벤질 케탈, α-아민 아세토페논 등을 사용할 수 있다.
The UV paint 118 includes an oligomer (prepolymer), a reactive diluent (functional monomer) and a photoinitiator. The photoinitiator undergoes ultraviolet radiation (UV) to generate radicals or promote cationic bonds, thereby curing through polymerization and crosslinking of oligomers and reactive monomers. As the oligomer, unsaturated polyester, epoxy acrylate, urethane acrylate, acrylic acrylate, polyester acrylate and the like can be used. As the reactive diluent, styrene, vinyltoluene, various kinds of acrylic monomers, vinyl monomers, and the like may be used. As the photoinitiator, α-hydroxy alkylphenone, benzoin ether, benzyl ketal, α-amine acetophenone and the like can be used.

폴리머에 충분한 전기장을 가하면 그 영향으로 일반적으로 전기쌍극자모멘트가 생겨서 전기편극 또는 전기분극이 일어날 수 있다.
If a sufficient electric field is applied to the polymer, its effects generally create an electric dipole moment, which can lead to an electric or polarization.

UV도료(118)는 자외선을 조사하여 중합 및 가교가 이루어지기 전, 즉 경화되기 전에는 20KV/cm~40KV/cm의 직류 전계하에서 용이하게 분극화(polarization)되어 올리고머, 반응성 희석제 및 광개시제 등이 균일한 두께와 평활한 면을 형성하면서 정렬됨을 확인하였다. 올리고머와 반응성 희석제는 상용성이 있기 때문에 자외선을 조사하기 전의 UV도료는 얼마간의 유동성을 갖는데, 이러한 유동성 때문에 용이하게 분극되는 것으로 추측되었다. 한편, UV도료(118)가 자외선에 의하여 중합 및 가교가 이루어져 경화된 후에는 20KV/cm~40KV/cm의 직류 전계하에서도 분극화 되지 않고 표면의 산화(코로나 방전에 의한 산화)만 발생함을 확인하였다. 전기쌍극자모멘트가 작용하여 두께가 균일화되고 표면은 평활해지며 그 결과 빛에 대한 난반사도 없어지게 된다. 따라서, UV도료가 분극화된 상태에서 경화시키면 매우 투명하고 매끄러운 UV표면코팅층을 얻을 수 있다.
The UV paint 118 is easily polarized under a direct current electric field of 20 KV / cm to 40 KV / cm before polymerization and crosslinking by curing ultraviolet rays, that is, curing, thereby uniformizing oligomers, reactive diluents, and photoinitiators. It was confirmed that the alignment while forming the thickness and smooth surface. Because oligomers and reactive diluents are compatible, UV paints before irradiating ultraviolet light have some fluidity, which is thought to be easily polarized due to such fluidity. On the other hand, after the UV coating 118 is polymerized and crosslinked by UV light and cured, only the surface oxidation (oxidation by corona discharge) occurs without polarization even under a DC electric field of 20 KV / cm ~ 40KV / cm. It was. The electric dipole moment acts to make the thickness uniform and the surface smooth, resulting in no diffuse reflection of light. Therefore, when the UV coating is cured in a polarized state, a very transparent and smooth UV surface coating layer can be obtained.

도 2에 도시된 바와 같이, 상기 UV도료 도포 장치(100)로는 고무코팅롤(112)과 백업롤(116) 사이를 통과하는 필름(1) 표면에 UV도료를 조정하여 투입하는 스틸코팅롤(114)을 포함하는 롤 코터를 사용할 수 있다. 상기 UV도료 도포 장치(100)로는 롤 코터 뿐만 아니라 커튼 코터 또는 스프레이를 사용할 수도 있다. 필름(1)이 UV도료 도포 장치(100)를 통과하면 UV도료가 도포된 필름(3a)이 된다. 필름의 두께는 20㎛ ~ 2,000㎛일 수 있다. UV도료의 도포 두께는 5㎛~40㎛일 수 있다.
As shown in FIG. 2, the UV coating device 100 is a steel coating roll for adjusting the UV coating on the surface of the film (1) passing between the rubber coating roll 112 and the backup roll 116 ( A roll coater can be used. The UV coating device 100 may be used not only a roll coater but also a curtain coater or a spray. When the film 1 passes through the UV paint coating device 100, the film 3 is coated with the UV paint. The thickness of the film may be 20 μm to 2,000 μm. Coating thickness of the UV paint may be 5㎛ ~ 40㎛.

도 2에 도시된 바와 같이, UV도료가 도포된 필름(3a)은 UV도료 분극화 장치(120)에 투입된다. UV도료 분극화 장치(120)는 상원전원(128)을 정류하여 직류전원을 공급하는 AD컨버터(126)와 상기 AD컨버터에 의하여 직류 전압이 인가되는 양극전극(122)과, 상기 양극전극(122)과 일정한 간극을 두고 배치된 접지전극(124)을 포함한다. 상기 양극전극(122)에 가해지는 전압은 20KV/cm - 40KV/cm의 전계를 형성할 수 있는 직류 전압이다. 직류전압은 20KV/cm ~40KV/cm의 범위에서 UV도료의 도포 두께에 따라 가변한다. 두께가 두꺼울수록 높은 전압의 전계를 가한다. UV도료가 도포된 필름(3a)은 양극전극(122)과 접지전극(124) 사이를 통과하면서 분극화되어 분극화된 UV도료가 도포된 필름(3b)이 된다.
As shown in FIG. 2, the film 3a coated with the UV paint is introduced into the UV paint polarization device 120. The UV paint polarization device 120 includes an AD converter 126 for rectifying the Senate power supply 128 to supply a DC power, a positive electrode 122 to which a DC voltage is applied by the AD converter, and the positive electrode 122. And a ground electrode 124 disposed with a predetermined gap therebetween. The voltage applied to the anode electrode 122 is a direct current voltage capable of forming an electric field of 20 KV / cm-40 KV / cm. The DC voltage varies depending on the coating thickness of the UV paint in the range of 20KV / cm ~ 40KV / cm. The thicker the thickness, the higher the voltage. The film 3a coated with the UV paint is polarized while passing between the anode electrode 122 and the ground electrode 124 to become a film 3b coated with the polarized UV paint.

분극화된 UV도료가 도포된 필름(3b)은 UV도료 경화 장치(140)에 투입되고, 표면의 분극화된 UV도료는 자외선(UV)에 의하여 경화된다. UV도료 경화 장치(140)는 UV램프(142)와 컨베이어(144)를 포함하고, 컨베이어(144)를 통해 이송되는 분극화된 UV도료가 도포된 필름(3b)의 상면에 자외선을 조사한다. 그 결과 UV도료는 분극화된 상태에서 중합 및 가교가 되어 경화코팅층이 된다.
The polarized UV coating film 3b is applied to the UV paint curing apparatus 140, the surface of the polarized UV coating is cured by ultraviolet (UV). The UV paint curing apparatus 140 includes a UV lamp 142 and a conveyor 144 and irradiates ultraviolet rays to the upper surface of the polarized UV paint-coated film 3b transferred through the conveyor 144. As a result, the UV paint is polymerized and crosslinked in a polarized state to become a hard coat layer.

상기 UV도료 도포 단계와, UV도료 도포층 분극화 단계와, UV경화코팅층 형성단계는 연속 공정에 의하여 이루어진다. 즉, UV도료 도포 후 적어도 수분 이내에 UV도료으 분극화 공정을 거치고, 분극화 공정을 거치 UV도료는 수분 이내에 UV 경화 공정을 거쳐야 한다.
The UV paint coating step, UV coating layer polarization step, UV curing coating layer forming step is made by a continuous process. That is, the UV coating should be polarized within at least a few minutes after the UV coating is applied, and the UV coating should go through a UV curing process within a few minutes.

<실시 예><Example>

실시 예로서, 100㎛ 두께의 PET필름에 UV도료를 10㎛의 두께로 도포한 후, 10cm의 간극을 두고 배치된 전극 사이에 30kV를 직류전압을 가하여 전계를 형성하고, UV도료 도포 필름을 전극 사이의 전계를 통과시키면서 분극화하고, 이를 다시 UV경화장치를 2m/min의 속도로 통과시켜 UV경화코팅층을 갖는 PET필름을 제조하였다.
As an example, after UV coating is applied to a PET film having a thickness of 100 μm with a thickness of 10 μm, an electric field is formed by applying a direct current voltage of 30 kV between electrodes disposed with a gap of 10 cm, and the UV coating film is coated with an electrode. Polarization while passing through the electric field between, and passed through the UV curing device at a speed of 2m / min to prepare a PET film having a UV curing coating layer.

비교 예로서, 100㎛ 두께의 PET필름에 UV도료를 10㎛의 두께로 도포한 후, 이를 다시 UV경화장치를 2m/min의 속도로 통과시켜 UV경화코팅층을 갖는 PET필름을 제조하였다.
As a comparative example, after applying a UV coating to a thickness of 10㎛ 100㎛ PET film, it was passed through the UV curing device at a speed of 2m / min to prepare a PET film having a UV curing coating layer.

실시 예와 비교 예에 대한 두께의 균일성, 표면 거칠기 및 투명도를 확인하기 위하여, 최대두께와 최소두께간의 편차, 조도 및 헤이즈 값을 구하였다. 편차측정는 마이크로미터를, 조도 측정에는 만능 표면 형상 측정기를, 헤이즈 값 측정에는 헤이즈 머신을 각각 사용하여 각각 10회씩 측정였고, 모두 상온, 대기압 및 상대습도 35%에서 측정이 이루어져 졌다. 또한, 이들 측정은 UV경화코팅층만을 분리하지 않고 UV경화코팅을 갖는 필름에 대하여 이루어졌다.
In order to confirm the uniformity of the thickness, the surface roughness and the transparency of the Examples and Comparative Examples, the deviation, roughness and haze value between the maximum thickness and the minimum thickness were determined. Deviation measurement was performed 10 times using micrometer, universal surface shape measuring device for roughness measurement, and haze machine for haze value measurement, respectively. All measurements were performed at room temperature, atmospheric pressure, and relative humidity of 35%. In addition, these measurements were made on a film having a UV curing coating without separating only the UV curing coating layer.

아래 표는 10회씩 측정한 두께 편차, 조도 및 헤이즈 값에 대한 평균값을 나타낸다.
The table below shows average values for thickness deviation, roughness and haze values measured 10 times.



두께 편차(평균)
Thickness deviation (average)

표면 조도(평균)
Surface roughness (average)
투 명 도(평균)
Transparency (average)
실 시 예
Example

1.9㎛
1.9 μm
0.03Ra(㎛)
0.03Ra (㎛)
2.8
2.8
비 교 예
Comparative Example

5.2㎛
5.2 μm
0.16Ra(㎛)
0.16Ra (㎛)
3.5
3.5

이 시험 결과를 통해, UV코팅필름은 UV 도료의 분자 배열에 따라 두께 편차, 표면 조도 및 투명도가 명확히 달라질 수 있음을 확인하였다.
Through the test results, it was confirmed that the UV coating film can be clearly different in thickness variation, surface roughness and transparency depending on the molecular arrangement of the UV paint.

1 : 필름
2a : 도포된 UV도료
2b : 분극화된 UV도료
2c : UV경화코팅층
3a : UV도료가 도포된 필름
3b : 분극화된 UV도료가 도포된 필름
3c : UV경화코팅층을 갖는 필름
100 : UV도료 도포 장치
112 : 고무코팅롤
114 : 스틸코팅롤
116 : 백업롤
118 : UV도료
120 : UV도료 분극화 장치
122,124 : 전극
126 : AD 컨버터
128 : 상용교류전원
140 : UV도료 경화 장치
142 : UV램프
144 : 컨베이어1: film
2a: applied UV paint
2b: polarized UV paint
2c: UV Curing Coating Layer
3a: UV coating film
3b: film coated with polarized UV paint
3c: film having a UV curing coating layer
100: UV coating device
112: rubber coating roll
114: steel coating roll
116: backup roll
118: UV Paint
120: UV paint polarization device
122,124: electrodes
126: AD converter
128: Commercial AC Power
140: UV paint curing device
142: UV Lamp
144: Conveyor

Claims (3)

필름 표면에 UV도료를 도포하는 UV도료 도포 단계;
필름에 도포된 경화전 UV도료에, UV도료가 분극화될 수 있는 범위의 직류 고전압을 가하여 UV도료를 분극화(polarization)하는 UV도료 분극화 단계;
필름 표면에 도포된 분극화된 UV도료에 UV를 조사하여 UV경화코팅층을 형성하는 UV경화코팅층 형성 단계;를 포함하는 필름의 UV경화코팅층 형성 방법.
UV paint coating step of applying a UV paint on the film surface;
UV coating polarization step of polarizing the UV coating by applying a direct current high voltage in the range that the UV coating can be polarized to the UV coating applied to the film;
UV curing coating layer forming step of forming a UV curing coating layer by irradiating UV to the polarized UV coating applied to the surface of the film; UV curing coating layer forming method of a film comprising a.
제1항에 있어서,
UV도료 도포 단계와, UV도료 도포층 분극화 단계와, UV경화코팅층 형성단계는 연속 공정에 의하여 이루어지는 것을 특징으로 하는 필름의 UV경화코팅층 형성 방법.
The method of claim 1,
UV coating coating step, UV coating layer polarization step, UV curing coating layer forming step is a UV curing coating layer forming method of the film, characterized in that made by a continuous process.
제1항에 있어서,
상기 직류 고전압은 20KV/cm ~ 40KV/cm의 전계를 형성하는 직류 고전압인 것을 특징으로 하는 필름의 UV경화코팅층 형성 방법.


The method of claim 1,
The direct current high voltage is a UV curing coating layer forming method of the film, characterized in that the direct current high voltage to form an electric field of 20KV / cm ~ 40KV / cm.


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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240058301A (en) 2022-10-26 2024-05-03 주식회사 디에스시동탄 Gear box

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000021807A (en) 1998-09-30 2000-04-25 장용균 Ultraviolet curable composition and hard coat film utilizing it
JP2011181748A (en) * 2010-03-02 2011-09-15 Daikin Industries Ltd Method of manufacturing polarized resin film
KR20130041503A (en) * 2011-10-17 2013-04-25 이상용 Manufacturing method of ultraviolet embossing coating extrudate continuously and the device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000021807A (en) 1998-09-30 2000-04-25 장용균 Ultraviolet curable composition and hard coat film utilizing it
JP2011181748A (en) * 2010-03-02 2011-09-15 Daikin Industries Ltd Method of manufacturing polarized resin film
KR20130041503A (en) * 2011-10-17 2013-04-25 이상용 Manufacturing method of ultraviolet embossing coating extrudate continuously and the device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240058301A (en) 2022-10-26 2024-05-03 주식회사 디에스시동탄 Gear box

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