WO2023229275A1 - Colored stainless steel manufacturing method using plasma processing - Google Patents

Colored stainless steel manufacturing method using plasma processing Download PDF

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Publication number
WO2023229275A1
WO2023229275A1 PCT/KR2023/006580 KR2023006580W WO2023229275A1 WO 2023229275 A1 WO2023229275 A1 WO 2023229275A1 KR 2023006580 W KR2023006580 W KR 2023006580W WO 2023229275 A1 WO2023229275 A1 WO 2023229275A1
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stainless steel
plasma treatment
temperature
colored
temperature plasma
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PCT/KR2023/006580
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French (fr)
Korean (ko)
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김태영
김민재
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김태영
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/02Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment 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
    • B05D3/08Pretreatment 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 flames
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment 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
    • B05D3/14Pretreatment 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents

Definitions

  • the present invention relates to a method of manufacturing colored stainless steel using plasma treatment, and more specifically, to a method of manufacturing colored stainless steel using plasma treatment capable of forming a coating film of various colors through a continuous process in a general roll-to-roll method. will be.
  • production method 1 In the automobile market, the automobile molding parts market is generally sought to become more advanced by anodizing aluminum after post-processing and color painting (production method 1) or attaching a color film during post-processing (production method 2). .
  • Aluminum or aluminum alloy is widely used because it is easy to process and can be made lightweight, but its structural strength is weak, so it can pose a serious threat to the safety of drivers and passengers due to damage and severe deformation during a collision.
  • Patent No. 10-0897169 “Method for manufacturing colored steel sheets using magnetic force and colored steel sheets manufactured by this method” (hereinafter referred to as prior art).
  • a chrome coating layer is formed through a chromate coating process, and then an undercoat is applied on the chrome coating layer to form an undercoat layer, and the undercoat layer contains carbonyl iron that exhibits deflection due to magnetic force.
  • magnetic force is applied to form a pattern on the top coat, followed by heating and drying at 210 to 250°C to form a top coat layer.
  • Patent Document 1 Registered Patent No. 10-0897169
  • the present invention was invented to improve the above problems, and is intended to provide a method of manufacturing colored stainless steel using plasma treatment, which enables the formation of a coating film of various colors through a continuous process in a general roll-to-roll method.
  • the present invention applies high-temperature plasma treatment to the surface of uncoiled and unidirectionally supplied stainless steel to remove moisture from the surface of the stainless steel, followed by low-temperature plasma treatment and removal of the passive film to remove moisture from the stainless steel surface.
  • a method of manufacturing colored stainless steel using plasma treatment can be provided, characterized in that the surface of the steel is colored by painting.
  • the flame temperature applied to the surface of the stainless steel during the high-temperature plasma treatment is 600°C to 800°C, and the surface temperature of the stainless steel is maintained at room temperature during the low-temperature plasma treatment.
  • the present invention includes a first step of seating stainless steel wound in a coiled form on an uncoiler, uncoiling it, and supplying it in one direction;
  • a first step of seating stainless steel wound in a coiled form on an uncoiler By maintaining the surface of the stainless steel at 40°C to 100°C by high-temperature plasma treatment by spraying the surface of the stainless steel with a flame formed of LPG and oxygen mixed gas at 600°C to 800°C for 6 to 18 seconds, A second step of removing moisture from the stainless steel surface;
  • a third step of removing the passive film of the stainless steel by maintaining the surface of the stainless steel at room temperature through low-temperature plasma treatment by applying a discharge voltage of 7000V to 8000V for 0.1 to 3 seconds to the surface of the stainless steel.
  • the high-temperature plasma treatment, the low-temperature plasma treatment, and the painting treatment are characterized in that they are performed continuously.
  • a plurality of different drying chambers are lined up in a row along the transfer direction of the stainless steel so that the drying temperature of the stainless steel gradually increases from 100°C to 250°C along the transfer direction. It is characterized by being placed.
  • the present invention involves surface treatment of the stainless steel coil itself received from a leading steel company through a general roll-to-roll production method, that is, treatment with high-temperature plasma and low-temperature plasma, painting, drying, cooling, and recoil. It has the advantage of enabling mass production of highly reliable colored stainless steel products, that is, tinted stainless steel products.
  • the present invention can provide customers with stainless steel products colored with paints of various colors by breaking away from the material characteristics and limitations of stainless steel, which cannot be colored due to chrome oxide film and passive film, and thus meet the diverse needs of vehicle manufacturers. It can be said to be very efficient in that it can actively respond to requests.
  • the present invention will be able to make a technological contribution to the development of the automobile industry in that it was first applied to automobile parts made of stainless steel.
  • FIG. 1 is a block diagram showing a method of manufacturing colored stainless steel using plasma processing according to an embodiment of the present invention.
  • 2 to 7 are conceptual diagrams sequentially showing a method of manufacturing colored stainless steel using plasma processing according to another embodiment of the present invention.
  • Figure 8 is a perspective conceptual diagram showing the coloring state of tinted steel manufactured through a method of manufacturing colored stainless steel using plasma processing according to various embodiments of the present invention and the appearance of automobile molding parts manufactured through this method.
  • Figure 1 is a block diagram showing a method of manufacturing colored stainless steel using plasma processing according to an embodiment of the present invention.
  • 2 to 7 are conceptual diagrams sequentially showing a method of manufacturing colored stainless steel using plasma processing according to another embodiment of the present invention.
  • Figure 8 is a perspective conceptual diagram showing the coloring state of tinted steel manufactured through a method of manufacturing colored stainless steel using plasma processing according to various embodiments of the present invention and the appearance of an automobile molding part manufactured through the method.
  • the surface of stainless steel 70 which is uncoiled and supplied in one direction, is treated with high-temperature plasma to remove moisture from the surface of the stainless steel 70, and then treated with low-temperature plasma to remove the passive film to produce stainless steel ( 70), an embodiment in which coloring is performed by painting the surface may be applied.
  • the flame temperature applied to the surface of stainless steel 70 during high-temperature plasma treatment is 600°C to 800°C, and during low-temperature plasma treatment, the surface temperature of stainless steel 70 is preferably maintained at room temperature for smooth painting processing. do.
  • the stainless steel 70 wound in the form of a coil can be placed on an uncoiler 10, uncoiled, and supplied in one direction (S1: first step).
  • the surface of the stainless steel 70 is subjected to high-temperature plasma treatment by spraying a flame formed of LPG and oxygen mixed gas at 600 °C to 800 °C for 6 to 18 seconds.
  • a flame formed of LPG and oxygen mixed gas at 600 °C to 800 °C for 6 to 18 seconds.
  • the operation of removing moisture from the surface of the stainless steel 70 can be performed (S2: second step).
  • the flame spray time is less than 6 seconds, moisture removal may not be achieved properly, and if the flame spray time exceeds 18 seconds, there is a risk of surface deterioration and material deterioration of the stainless steel 70, which is the base material.
  • the flame temperature is less than 600°C, moisture removal may not be achieved properly, and if the flame temperature exceeds 800°C, there is a risk of surface deterioration and material deterioration of the stainless steel 70, which is the base material.
  • the stainless steel By maintaining the surface of the stainless steel 70 at room temperature, the passivating film of the stainless steel 70 can be removed (S3: third step).
  • the passivation film may not be completely removed, and if the discharge voltage exceeds 8000V, there is a risk of surface deterioration and material deterioration of the stainless steel 70, which is the base material.
  • the passive film may not be completely removed, and if the application time of high-frequency plasma is more than 3 seconds, there is a risk of surface deterioration and material deterioration of the stainless steel (70), which is the base material. There is.
  • paint of a specific color is applied to the surface of the stainless steel 70 from which the passive film has been removed, which is introduced into the painting booth 40 and transferred in one direction, from the ceiling side of the painting booth 40 toward the floor side.
  • Coloring the paint of a specific color can be performed by maintaining the temperature between 15°C and 25°C using an electrostatic painting device that sprays forcefully (S4: fourth step).
  • the colored stainless steel 70 may be put into the drying chamber 50 and dried at a temperature of 100°C to 250°C (S5: fifth step).
  • the dried stainless steel 70 can be cooled and recoiled (S6: sixth step).
  • the stainless steel 70 is seated on the uncoiler 10 as shown in FIG. 2 and uncoiled, and then the packaging material of the stainless steel 70 is removed.
  • the surface of the stainless steel 70 is removed by high-temperature flame sprayed through the flame spray nozzle assembly 20 as shown in FIG. 3 to ensure smooth removal of the passive film before electrostatic painting.
  • the process of removing moisture is carried out.
  • the third step (S3) is to apply paint to the surface of the stainless steel 70 through a high-frequency corona discharger 30 as shown in FIG. 4 so that the paint can be smoothly colored on the surface of the stainless steel 70 before electrostatic painting. It can be said to be a process for removing the formed passive film.
  • step (S3) surface activation, surface hydrophilicity and adhesion can be increased, and adhesion can be improved when applying paint.
  • the stainless steel 70 forms a passive film with a high tendency to passivity, and accordingly, it is impossible to paint the stainless steel 70 using general methods.
  • the surface of the stainless steel 70 is colored or tinted to enable color implementation through the bell painting equipment 41 in the painting booth 40 as shown in FIG. 5. It can be said to be a process for carrying out.
  • a pair of bell painting equipment (41), i.e. electrostatic painting devices, are placed side by side to paint the stainless steel (70) steel sheets.
  • the paint is sprayed on the surface of the stainless steel 70 along the transfer direction.
  • the high-temperature plasma treatment, low-temperature plasma treatment, and painting treatment are performed continuously.
  • the high-temperature plasma treatment in the second step (S2), the low-temperature plasma treatment in the third step (S3), and the painting treatment in the fourth step (S4) must be performed continuously without any rest time.
  • the high-temperature plasma processing device, the low-temperature plasma processing device, and the electrostatic coating device that perform the second step (S2) to the fourth step (S4) must be arranged continuously or in line along the transfer direction of the stainless steel 70. will be.
  • the passive film is removed in the low-temperature plasma treatment, and the stainless steel ( 70)
  • a series of process equipment that colors paint on the surface can be called a tinted painting system.
  • the fifth step (S5) can be said to be a process of drying the stainless steel 70, which has been colored through a tinted painting system, to the required temperature.
  • the stainless steel 70 is placed in a plurality of different drying chambers 50 so that the drying temperature is gradually increased from 100° C. to 250° C. along the transfer direction as shown in FIG. 6. It is preferable that they are arranged in a row along the transport direction of the stainless steel 70.
  • the purpose of arranging a plurality of different drying chambers 50 along the transport direction is to prevent overcuring of the colored paint on the stainless steel 70 after completion of the fourth step (S4).
  • Cooling in the sixth step (S6) is performed by using a plurality of cooling fans 61 as shown in FIG. 7(a) on the lower side of the conveyor 65 through which the stainless steel 70 discharged from the drying chamber 50 is transferred. It is accomplished by operation.
  • an additional operation of attaching a protective film to the stainless steel 70 may be performed before recoiling the stainless steel 70 to the recoiler 62 as shown in FIG. 7(b). .
  • the raw material, stainless steel (70), is STS430, with a maximum coil width of 1,200 mm, a maximum weight of 5 tons, and a maximum length of 1,300 m.
  • the protective film or packaging material on the surface of the stainless steel (70) is recovered and removed.
  • the surface of the stainless steel 70 is painted continuously without intervals through the fourth step (S4). .
  • the stainless steel 70 is cooled through the cooling fan 61 and sent to the recoiler 62 to manage the film thickness, color difference, and gloss on the surface of the stainless steel 70 before recoiling. Inspect the appearance and adhesion of the coating film.
  • a protective film is attached to the surface of the stainless steel 70 and recoiled together.
  • the first step (S1) to the sixth step (S6) may be repeated at least twice or more in accordance with the requirements for the thickness of the coating film formed on the surface of the stainless steel 70 at the customer and ordering place.
  • the present applicant applied a 4-5 ⁇ m thick primer to the stainless steel surface through the first step (S1) to the sixth step (S6) at an actual manufacturing site, and then again applied the primer to the first step (S1) to the sixth step.
  • the primer was applied to the first step (S1) to the sixth step.
  • tinted stainless steel (71 to 74) of various colors is produced as shown in FIG. 8, and the paint is clearly and neatly colored. Tinted molded parts 75 can also be produced.
  • the basic technical idea of the present invention is to provide a method for manufacturing colored stainless steel using plasma treatment, which enables the formation of a coating film of various colors through a continuous process in a general roll-to-roll method.

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Abstract

The present invention relates to a colored stainless steel manufacturing method using plasma processing in which high-temperature plasma processing is performed on the surface of a stainless steel uncoiled and supplied in one direction, so that moisture is removed from the surface of the stainless steel, and then low-temperature plasma processing is performed on same so that a passivation layer is removed and the surface of the stainless steel is painted to be colored, and thus paint film having various colors can be formed through continuous normal roll-to-roll processing.

Description

플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법Method for manufacturing colored stainless steel using plasma treatment
본 발명은 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법에 관한 것으로, 더욱 상세하게는 일반적인 롤 투 롤 방식으로 연속 공정을 통한 다양한 색상의 도막 형성이 가능한 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법에 관한 것이다.The present invention relates to a method of manufacturing colored stainless steel using plasma treatment, and more specifically, to a method of manufacturing colored stainless steel using plasma treatment capable of forming a coating film of various colors through a continuous process in a general roll-to-roll method. will be.
자동차 시장의 경우 일반적으로 후가공 후 알루미늄을 아노다이징 처리하여 컬러 도장을 실시(생산방식 1)하거나, 후가공시 컬러 필름을 부착하는 방법(생산방식2)으로 자동차 몰딩 부품 시장의 고급화를 도모하고 있는 실정이다.In the automobile market, the automobile molding parts market is generally sought to become more advanced by anodizing aluminum after post-processing and color painting (production method 1) or attaching a color film during post-processing (production method 2). .
생산방식1과 생산방식2 등을 포함한 기존의 공정들은 원가가 비싼 문제가 있었다.Existing processes, including production method 1 and production method 2, had the problem of being expensive.
알루미늄 또는 알루미늄 합금은 소재 가공이 용이하고 경량화 구현이 가능하다는 점에서 널리 사용되고 있지만, 구조적 강도가 약하므로 충돌시 파손과 심한 변형으로 운전자 및 탑승자의 안전에 심각한 위협이 될 수 있다.Aluminum or aluminum alloy is widely used because it is easy to process and can be made lightweight, but its structural strength is weak, so it can pose a serious threat to the safety of drivers and passengers due to damage and severe deformation during a collision.
이러한 관점에서 최근 자동차 몰딩 부품 시장에서 구조적 강도가 우수한 소재인 스테인리스 스틸이 각광받고 있다.From this perspective, stainless steel, a material with excellent structural strength, has recently been in the spotlight in the automobile molding parts market.
하지만, 스테인리스 스틸은 크롬산화피막과 부동태피막이 상시 형성되어 있는 그 소재 특성상 일반 도료 자체의 도장 및 이에 따른 착색 자체가 불가능한 문제점이 있었다. However, due to the nature of stainless steel, in which a chromium oxide film and a passive film are always formed, there was a problem in that it was impossible to paint with general paint itself and color it accordingly.
상기와 같은 관점에서 발명된 것으로 등록특허 제10-0897169호의 "자력을 이용한 칼라강판의 제조방법 및 이 방법으로 제조된칼라강판"(이하 선행기술) 등과 같은 것을 들 수 있다.Examples of inventions from the above-described viewpoint include Patent No. 10-0897169, “Method for manufacturing colored steel sheets using magnetic force and colored steel sheets manufactured by this method” (hereinafter referred to as prior art).
선행기술은 크로메이트 피막처리 공정을 거쳐 크롬 도장층을 형성한 후, 크롬 도장층 상에 하도 도료를 도장하여 하도 도장층을 형성하고, 하도 도장층 상에 자력에 의한 편향성을 나타내는 카르보닐 철이 포함된 상도 도료를 도장한 다음, 자력을 가하여 상기 상도 도료에 무늬 패턴을 형성한 후, 210 ~ 250℃로 가열 건조하여 상도 피막층을 형성하는 방식을 채택하고 있다.In the prior art, a chrome coating layer is formed through a chromate coating process, and then an undercoat is applied on the chrome coating layer to form an undercoat layer, and the undercoat layer contains carbonyl iron that exhibits deflection due to magnetic force. After applying the top coat, magnetic force is applied to form a pattern on the top coat, followed by heating and drying at 210 to 250°C to form a top coat layer.
그러나, 선행기술 또한 도장층을 여러번 형성하고 카르보닐 철을 포함한 상도 도료 등의 원가가 매우 높아 제조 현장에서 쉽게 적용할 수 없어 경제적으로 매우 비효율적인 것이다. However, the prior art also requires the formation of multiple coating layers and the cost of top coats containing carbonyl iron is very high, so it cannot be easily applied at manufacturing sites, making it economically very inefficient.
특히, 선행기술은 도막 형성을 위하여 서로 다른 도료들을 수차례 도포하는 번거롭고 복잡한 공정이 수반되어야 하므로, 제조 시간과 비용의 측면에서도 매우 비효율적이라 할 수 있다.In particular, the prior art requires a cumbersome and complicated process of applying different paints several times to form a coating film, so it can be said to be very inefficient in terms of manufacturing time and cost.
<선행기술문헌><Prior art literature>
(특허문헌 1) 등록특허 제10-0897169호(Patent Document 1) Registered Patent No. 10-0897169
본 발명은 상기와 같은 문제점을 개선하기 위하여 발명된 것으로, 일반적인 롤 투 롤 방식으로 연속 공정을 통한 다양한 색상의 도막 형성이 가능하게 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 제공하기 위한 것이다.The present invention was invented to improve the above problems, and is intended to provide a method of manufacturing colored stainless steel using plasma treatment, which enables the formation of a coating film of various colors through a continuous process in a general roll-to-roll method.
상기와 같은 목적을 달성하기 위하여, 본 발명은 언코일링되어 일방향으로 공급된 스테인리스 스틸의 표면에 고온 플라즈마 처리하여 상기 스테인리스 스틸 표면의 수분을 제거한 후 저온 플라즈마 처리하고 상기 부동태피막을 제거하여 상기 스테인리스 스틸의 표면에 도장 처리함으로써 착색되는 것을 특징으로 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 제공할 수 있다.In order to achieve the above object, the present invention applies high-temperature plasma treatment to the surface of uncoiled and unidirectionally supplied stainless steel to remove moisture from the surface of the stainless steel, followed by low-temperature plasma treatment and removal of the passive film to remove moisture from the stainless steel surface. A method of manufacturing colored stainless steel using plasma treatment can be provided, characterized in that the surface of the steel is colored by painting.
여기서, 상기 고온 플라즈마 처리시 상기 스테인리스 스틸의 표면에 적용되는 화염 온도는 600℃ 내지 800℃이며, 상기 저온 플라즈마 처리시 상기 스테인리스 스틸의 표면 온도는 상온으로 유지되는 것을 특징으로 한다. Here, the flame temperature applied to the surface of the stainless steel during the high-temperature plasma treatment is 600°C to 800°C, and the surface temperature of the stainless steel is maintained at room temperature during the low-temperature plasma treatment.
한편, 본 발명은 코일 형태로 권취된 스테인리스 스틸을 언코일러(uncoiler)에 안착시키고 언코일링하여 일방향으로 공급하는 제1 단계; 상기 스테인리스 스틸의 표면에 600℃ 내지 800℃의 LPG와 산소 혼합 가스로 형성되는 화염으로 6 내지 18초간 분사하는 고온 플라즈마 처리에 의해, 상기 스테인리스 스틸의 표면을 40℃ 내지 100℃로 유지시킴으로써, 상기 스테인리스 스틸 표면의 수분을 제거하는 제2 단계; 상기 스테인리스 스틸의 표면에 7000V 내지 8000V의 방전 전압을 0.1초 내지 3초 동안 적용하는 저온 플라즈마 처리에 의해, 상기 스테인리스 스틸의 표면을 상온으로 유지시킴으로써, 상기 스테인리스 스틸의 부동태피막을 제거하는 제3 단계; 도장 부스로 투입되어 일방향으로 이송되는 상기 부동태피막이 제거된 상기 스테인리스 스틸의 표면에, 상기 도장 부스의 천장측으로부터 바닥측을 향하여 특정 색상의 도료를 강제 분사하는 정전 도장 장치에 의해 15℃ 내지 25℃를 유지하며 도장 처리함으로써, 상기 특정 색상의 도료를 착색시키는 제4 단계; 건조 챔버로 투입되어 착색이 완료된 상기 스테인리스 스틸을 100℃ 내지 250℃의 온도에서 건조시키는 제5 단계; 및 건조가 완료된 상기 스테인리스 스틸을 냉각시키고 리코일(recoil)하는 제6 단계를 포함하는 것을 특징으로 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 제공할 수도 있을 것이다. Meanwhile, the present invention includes a first step of seating stainless steel wound in a coiled form on an uncoiler, uncoiling it, and supplying it in one direction; By maintaining the surface of the stainless steel at 40°C to 100°C by high-temperature plasma treatment by spraying the surface of the stainless steel with a flame formed of LPG and oxygen mixed gas at 600°C to 800°C for 6 to 18 seconds, A second step of removing moisture from the stainless steel surface; A third step of removing the passive film of the stainless steel by maintaining the surface of the stainless steel at room temperature through low-temperature plasma treatment by applying a discharge voltage of 7000V to 8000V for 0.1 to 3 seconds to the surface of the stainless steel. ; 15°C to 25°C by an electrostatic painting device that forcibly sprays paint of a specific color from the ceiling side of the painting booth toward the floor side of the stainless steel surface from which the passive film has been removed, which is introduced into the painting booth and transported in one direction. A fourth step of coloring the paint of the specific color by painting while maintaining it; A fifth step of drying the stainless steel that has been colored by entering it into a drying chamber at a temperature of 100°C to 250°C; And a sixth step of cooling and recoiling the dried stainless steel may be provided.
여기서, 상기 고온 플라즈마 처리와 상기 저온 플라즈마 처리 및 상기 도장 처리는 연속적으로 실시되는 것을 특징으로 한다.Here, the high-temperature plasma treatment, the low-temperature plasma treatment, and the painting treatment are characterized in that they are performed continuously.
이때, 상기 제5 단계에서 상기 스테인리스 스틸은, 이송되는 방향을 따라 건조 온도가 상기 100℃부터 상기 250℃까지 단계적으로 상승되도록, 복수의 서로 다른 건조 챔버가 상기 스테인리스 스틸의 이송 방향을 따라 일렬로 배치되는 것을 특징으로 한다. At this time, in the fifth step, a plurality of different drying chambers are lined up in a row along the transfer direction of the stainless steel so that the drying temperature of the stainless steel gradually increases from 100°C to 250°C along the transfer direction. It is characterized by being placed.
상기와 같은 구성의 본 발명에 따르면, 다음과 같은 효과를 도모할 수 있다.According to the present invention configured as described above, the following effects can be achieved.
우선, 본 발명은 일반적인 롤 투 롤(roll to roll) 생산 방식을 통하여 유수의 철강회사로부터 입고된 스테인리스 스틸 코일 자체를 표면 처리, 즉 고온 플라즈마와 저온 플라즈마 처리후 도장 처리하고 건조 냉각하여 리코일링함으로써 신뢰성이 우수한 컬러 스테인리스 스틸, 즉 틴티드 스테인리스 스틸 제품의 대량 생산이 가능하게 되는 특장점을 가진다.First, the present invention involves surface treatment of the stainless steel coil itself received from a leading steel company through a general roll-to-roll production method, that is, treatment with high-temperature plasma and low-temperature plasma, painting, drying, cooling, and recoil. It has the advantage of enabling mass production of highly reliable colored stainless steel products, that is, tinted stainless steel products.
무엇보다 본 발명은 크롬산화피막과 부동태피막으로 인한 착색 자체가 불가능한 스테인리스 스틸의 소재 특성과 제약을 탈피하여 다양한 색상의 도료가 착색된 스테인리스 스틸 제품을 수요처에 제공할 수 있으므로 차량 메이커들의 다양한 수요와 요구에 적극적으로 대응할 수 있다는 점에서 매우 효율적이라 하겠다.Above all, the present invention can provide customers with stainless steel products colored with paints of various colors by breaking away from the material characteristics and limitations of stainless steel, which cannot be colored due to chrome oxide film and passive film, and thus meet the diverse needs of vehicle manufacturers. It can be said to be very efficient in that it can actively respond to requests.
특히 본 발명은 스테인레스 스틸 재질로 이루어진 자동차부품에 최초로 적용되었다는 점에서 자동차 산업발달에 획기적인 기여를 할 수 있을 것이다.In particular, the present invention will be able to make a groundbreaking contribution to the development of the automobile industry in that it was first applied to automobile parts made of stainless steel.
도 1은 본 발명의 일 실시예에 따른 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 도시한 블록 선도1 is a block diagram showing a method of manufacturing colored stainless steel using plasma processing according to an embodiment of the present invention.
도 2 내지 도 7은 본 발명의 다른 실시예에 따른 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 순차적으로 도시한 개념도 2 to 7 are conceptual diagrams sequentially showing a method of manufacturing colored stainless steel using plasma processing according to another embodiment of the present invention.
도 8은 본 발명의 다양한 실시예에 따른 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 통하여 제조된 틴티드 스틸의 착색 상태 및 이를 통하여 제작된 자동차 몰딩 부품의 외관을 나타낸 사시 개념도 Figure 8 is a perspective conceptual diagram showing the coloring state of tinted steel manufactured through a method of manufacturing colored stainless steel using plasma processing according to various embodiments of the present invention and the appearance of automobile molding parts manufactured through this method.
<부호의 설명><Explanation of symbols>
10...언코일러10...Uncoiler
20...화염분사 노즐 어셈블리20...Flame spray nozzle assembly
30...고주파 코로나 방전기30...High frequency corona discharger
40...도장 부스40...Painting booth
41...벨 도장 장비41...Bell painting equipment
50...건조 챔버50...drying chamber
61...냉각팬61...Cooling fan
62...리코일러62...recoiler
65...컨베이어65...Conveyor
70...스테인리스 스틸70...stainless steel
S1...제1 단계S1...First stage
S2...제2 단계S2...second stage
S3...제3 단계S3...third stage
S4...제4 단계 S4...Step 4
S5...제5 단계S5...Stage 5
S6...제6 단계S6...Sixth step
본 발명의 이점 및 특징, 그리고 그것들을 달성하는 방법은 첨부되는 도면과 함께 상세하게 후술되는 실시예를 참조하면 명확해질 것이다.The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings.
그러나, 본 발명은 이하에서 개시되는 실시예로 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 것이다.However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms.
본 명세서에서 본 실시예는 본 발명의 개시가 완전하도록 하며, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이다.The examples herein are provided to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the invention.
그리고 본 발명은 청구항의 범주에 의해 정의될 뿐이다.And the present invention is only defined by the scope of the claims.
따라서, 몇몇 실시예에서, 잘 알려진 구성 요소, 잘 알려진 동작 및 잘 알려진 기술들은 본 발명이 모호하게 해석되는 것을 피하기 위하여 구체적으로 설명되지 않는다.Accordingly, in some embodiments, well-known components, well-known operations and well-known techniques are not specifically described in order to avoid ambiguous interpretation of the present invention.
또한, 명세서 전체에 걸쳐 동일 참조 부호는 동일 구성 요소를 지칭하고, 본 명세서에서 사용된(언급된) 용어들은 실시예를 설명하기 위한 것이며 본 발명을 제한하고자 하는 것은 아니다.In addition, the same reference numerals refer to the same components throughout the specification, and the terms used (mentioned) in the specification are for explaining embodiments and are not intended to limit the present invention.
본 명세서에서, 단수형은 문구에서 특별히 언급하지 않는 한 복수형도 포함하며, '포함(또는, 구비)한다'로 언급된 구성 요소 및 동작은 하나 이상의 다른 구성요소 및 동작의 존재 또는 추가를 배제하지 않는다.In this specification, the singular also includes the plural unless specifically stated in the phrase, and elements and operations referred to as 'including (or, including)' do not exclude the presence or addition of one or more other elements and operations. .
다른 정의가 없다면, 본 명세서에서 사용되는 모든 용어(기술 및 과학적 용어를 포함)는 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에게 공통적으로 이해될 수 있는 의미로 사용될 수 있을 것이다.Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains.
또 일반적으로 사용되는 사전에 정의되어 있는 용어들은 정의되어 있지 않은 한 이상적으로 또는 과도하게 해석되지 않는다.Additionally, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless they are defined.
이하, 첨부된 도면을 참고로 본 발명의 바람직한 실시예에 대하여 설명한다.Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.
우선, 도 1은 본 발명의 일 실시예에 따른 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 도시한 블록 선도이다. First, Figure 1 is a block diagram showing a method of manufacturing colored stainless steel using plasma processing according to an embodiment of the present invention.
그리고, 도 2 내지 도 7은 본 발명의 다른 실시예에 따른 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 순차적으로 도시한 개념도이다. 2 to 7 are conceptual diagrams sequentially showing a method of manufacturing colored stainless steel using plasma processing according to another embodiment of the present invention.
또한, 도 8은 본 발명의 다양한 실시예에 따른 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 통하여 제조된 틴티드 스틸의 착색 상태 및 이를 통하여 제작된 자동차 몰딩 부품의 외관을 나타낸 사시 개념도이다. In addition, Figure 8 is a perspective conceptual diagram showing the coloring state of tinted steel manufactured through a method of manufacturing colored stainless steel using plasma processing according to various embodiments of the present invention and the appearance of an automobile molding part manufactured through the method.
본 발명은 도시된 바와 같이 언코일링되어 일방향으로 공급된 스테인리스 스틸(70)의 표면에 고온 플라즈마 처리하여 스테인리스 스틸(70) 표면의 수분을 제거한 후 저온 플라즈마 처리하고 부동태피막을 제거하여 스테인리스 스틸(70)의 표면에 도장 처리함으로써 착색되는 실시예를 적용할 수 있을 것이다.In the present invention, as shown, the surface of stainless steel 70, which is uncoiled and supplied in one direction, is treated with high-temperature plasma to remove moisture from the surface of the stainless steel 70, and then treated with low-temperature plasma to remove the passive film to produce stainless steel ( 70), an embodiment in which coloring is performed by painting the surface may be applied.
본 발명은 상기와 같은 실시예의 적용이 가능하며 다음과 같은 다양한 실시예의 적용 또한 가능함은 물론이다. The present invention can be applied to the above-mentioned embodiments, and of course, it is also possible to apply the following various embodiments.
우선, 고온 플라즈마 처리시 스테인리스 스틸(70)의 표면에 적용되는 화염 온도는 600℃ 내지 800℃이며, 저온 플라즈마 처리시 스테인리스 스틸(70)의 표면 온도는 상온으로 유지되는 것이 원활한 도장 처리를 위하여 바람직하다.First, the flame temperature applied to the surface of stainless steel 70 during high-temperature plasma treatment is 600°C to 800°C, and during low-temperature plasma treatment, the surface temperature of stainless steel 70 is preferably maintained at room temperature for smooth painting processing. do.
한편, 도 2와 같이 코일 형태로 권취된 스테인리스 스틸(70)을 언코일러(10, uncoiler)에 안착시키고 언코일링하여 일방향으로 공급하는 작업이 이루어질 수 있다(S1: 제1 단계). Meanwhile, as shown in FIG. 2, the stainless steel 70 wound in the form of a coil can be placed on an uncoiler 10, uncoiled, and supplied in one direction (S1: first step).
이후, 도 3과 같이 스테인리스 스틸(70)의 표면에 600℃ 내지 800℃의 LPG와 산소 혼합 가스로 형성되는 화염으로 6 내지 18초간 분사하는 고온 플라즈마 처리에 의해, 스테인리스 스틸(70)의 표면을 40℃ 내지 100℃로 유지시킴으로써, 스테인리스 스틸(70) 표면의 수분을 제거하는 작업이 이루어질 수 있다(S2: 제2 단계). Thereafter, as shown in FIG. 3, the surface of the stainless steel 70 is subjected to high-temperature plasma treatment by spraying a flame formed of LPG and oxygen mixed gas at 600 ℃ to 800 ℃ for 6 to 18 seconds. By maintaining the temperature at 40°C to 100°C, the operation of removing moisture from the surface of the stainless steel 70 can be performed (S2: second step).
화염 분사 시간이 6초 미만일 경우 수분 제거가 제대로 이루어지지 못할 수 있으며, 화염 분사 시간이 18초를 초과할 경우 기재인 스테인리스 스틸(70)의 표면 열화 및 소재 변성의 우려가 있다.If the flame spray time is less than 6 seconds, moisture removal may not be achieved properly, and if the flame spray time exceeds 18 seconds, there is a risk of surface deterioration and material deterioration of the stainless steel 70, which is the base material.
화염 온도가 600℃ 미만일 경우 수분 제거가 제대로 이루어지지 못할 수 있으며, 화염 온도가 800℃를 초과할 경우 기재인 스테인리스 스틸(70)의 표면 열화 및 소재 변성의 우려가 있다.If the flame temperature is less than 600°C, moisture removal may not be achieved properly, and if the flame temperature exceeds 800°C, there is a risk of surface deterioration and material deterioration of the stainless steel 70, which is the base material.
계속하여, 도 4와 같이 스테인리스 스틸(70)의 표면에 방전 전압 7000V 내지 8000V의 고주파 플라즈마를 0.1초 내지 3초, 더욱 바람직하게는 1~2초 동안 적용하는 저온 플라즈마 처리에 의해, 스테인리스 스틸(70)의 표면을 상온으로 유지시킴으로써, 스테인리스 스틸(70)의 부동태피막을 제거하는 작업이 이루어질 수 있다(S3: 제3 단계). Subsequently, as shown in FIG. 4, the stainless steel ( By maintaining the surface of the stainless steel 70 at room temperature, the passivating film of the stainless steel 70 can be removed (S3: third step).
방전 전압이 7000V 미만일 경우 부동태피막의 제거가 완전하게 이루어지지 못할 수 있으며, 방전 전압이 8000V를 초과하는 경우 기재인 스테인리스 스틸(70)의 표면 열화 및 소재 변성의 우려가 있다.If the discharge voltage is less than 7000V, the passivation film may not be completely removed, and if the discharge voltage exceeds 8000V, there is a risk of surface deterioration and material deterioration of the stainless steel 70, which is the base material.
고주파 플라즈마의 적용 시간이 0.1초 미만일 경우 부동태피막의 제거가 완전하게 이루어지지 못할 수 있으며, 고주파 플라즈마의 적용 시간이 3초를 초과하는 경우 기재인 스테인리스 스틸(70)의 표면 열화 및 소재 변성의 우려가 있다.If the application time of high-frequency plasma is less than 0.1 seconds, the passive film may not be completely removed, and if the application time of high-frequency plasma is more than 3 seconds, there is a risk of surface deterioration and material deterioration of the stainless steel (70), which is the base material. There is.
다음으로, 도 5와 같이 도장 부스(40)로 투입되어 일방향으로 이송되는 부동태피막이 제거된 스테인리스 스틸(70)의 표면에, 도장 부스(40)의 천장측으로부터 바닥측을 향하여 특정 색상의 도료를 강제 분사하는 정전 도장 장치에 의해 15℃ 내지 25℃를 유지하며 도장 처리함으로써, 특정 색상의 도료를 착색시키는 작업이 이루어질 수 있다(S4: 제4 단계). Next, as shown in FIG. 5, paint of a specific color is applied to the surface of the stainless steel 70 from which the passive film has been removed, which is introduced into the painting booth 40 and transferred in one direction, from the ceiling side of the painting booth 40 toward the floor side. Coloring the paint of a specific color can be performed by maintaining the temperature between 15°C and 25°C using an electrostatic painting device that sprays forcefully (S4: fourth step).
도장 부스(40) 내부의 온도 조건 범위, 즉 15℃ 내지 25℃를 벗어나는 경우 도료가 스테인리스 스틸(70)의 표면에 제대로 착색되지 않거나 흘러내리는 등의 문제가 발생하게 될 것이다.If the temperature condition range inside the painting booth 40 is outside the range, that is, 15°C to 25°C, problems such as paint not being properly colored or flowing down on the surface of the stainless steel 70 will occur.
이후, 도 6과 같이 건조 챔버(50)로 투입되어 착색이 완료된 스테인리스 스틸(70)을 100℃ 내지 250℃의 온도에서 건조시키는 작업이 이루어질 수 있다(S5: 제5 단계). Thereafter, as shown in FIG. 6, the colored stainless steel 70 may be put into the drying chamber 50 and dried at a temperature of 100°C to 250°C (S5: fifth step).
최종적으로, 도 7과 같이 건조가 완료된 스테인리스 스틸(70)을 냉각시키고 리코일(recoil)하는 작업이 이루어질 수 있다(S6: 제6 단계).Finally, as shown in FIG. 7, the dried stainless steel 70 can be cooled and recoiled (S6: sixth step).
제1 단계(S1)에서는 스테인리스 스틸(70)을 도 2와 같이 언코일러(10)에 안착시켜 언코일링한 후 스테인리스 스틸(70)의 포장재를 제거하는 작업이 추가적으로 실시될 수 있다.In the first step (S1), the stainless steel 70 is seated on the uncoiler 10 as shown in FIG. 2 and uncoiled, and then the packaging material of the stainless steel 70 is removed.
제2 단계(S2)는 정전 도장 실시전에 부동태피막 제거가 원활하게 이루어질 수 있도록 도 3에 도시된 바와 같은 화염분사 노즐 어셈블리(20)를 통하여 분사되는 고온의 화염에 의하여 스테인리스 스틸(70) 표면의 수분 제거를 하는 공정이 이루어지는 것이다.In the second step (S2), the surface of the stainless steel 70 is removed by high-temperature flame sprayed through the flame spray nozzle assembly 20 as shown in FIG. 3 to ensure smooth removal of the passive film before electrostatic painting. The process of removing moisture is carried out.
제2 단계(S2)에서는 수분과 함께 불필요한 이물질 또한 제거하는 효과를 도모할 수 있다.In the second step (S2), it is possible to achieve the effect of removing unnecessary foreign substances along with moisture.
국내 유수의 업체에서도 전처리 공정으로서 고온 플라즈마를 이용한 제2 단계(S2) 공정을 실시하는 사례가 없는 것으로 확인된다.It has been confirmed that even leading domestic companies have not implemented the second stage (S2) process using high-temperature plasma as a pretreatment process.
제3 단계(S3)는 정전 도장 전에 스테인리스 스틸(70)의 표면에 도료가 원활하게 착색될 수 있도록, 도 4에 도시된 바와 같은 고주파 코로나 방전기(30)를 통하여 스테인리스 스틸(70)의 표면에 형성된 부동태피막을 제거하기 위한 공정이라 할 수 있다.The third step (S3) is to apply paint to the surface of the stainless steel 70 through a high-frequency corona discharger 30 as shown in FIG. 4 so that the paint can be smoothly colored on the surface of the stainless steel 70 before electrostatic painting. It can be said to be a process for removing the formed passive film.
제3 단계(S3)에서는 표면 활성화와 표면 친수성 및 점착력을 증대시키고 도료의 도장시 부착력을 향상시키는 효과를 도모할 수 있다.In the third step (S3), surface activation, surface hydrophilicity and adhesion can be increased, and adhesion can be improved when applying paint.
스테인리스 스틸(70)은 대기 중에 노출되는 즉시 표면에 크롬산화 피막층이 생기므로 외부로부터 원소가 침투할 수 없게 되므로, 부식에 대하여 강한 저항성을 띄게 되며, 이러한 강한 저항성을 가지는 것을 부동태 경향이 크다고 하는 것이다.As soon as stainless steel (70) is exposed to the atmosphere, a chromium oxide film layer is formed on the surface, making it impossible for elements to penetrate from the outside, so it has strong resistance to corrosion. This strong resistance is said to have a high tendency to passivity. .
따라서, 스테인리스 스틸(70)은 부동태 경향이 큰 부동태피막을 형성하게 되며, 이에 따라 스테인리스 스틸(70)에는 일반적인 방법으로는 도장 자체가 불가능하다는 것이 당업계에서는 널리 알려진 사실이다.Therefore, it is widely known in the art that the stainless steel 70 forms a passive film with a high tendency to passivity, and accordingly, it is impossible to paint the stainless steel 70 using general methods.
제4 단계(S4)에서는 도 5에 도시된 바와 같은 도장 부스(40) 내에서 벨 도장 장비(41)를 통하여 스테인리스 스틸(70)의 표면에 컬러 구현이 가능하게 착색하거나 틴티드 도장(tinted painting)을 실시하기 위한 공정이라 할 수 있다.In the fourth step (S4), the surface of the stainless steel 70 is colored or tinted to enable color implementation through the bell painting equipment 41 in the painting booth 40 as shown in FIG. 5. It can be said to be a process for carrying out.
최대 1200mm 폭을 가진 코일로부터 언코일링된 STS430 스테인리스 스틸(70) 강판에 효율적인 정전 도장이 이루어지기 위해서는 벨 도장 장비(41), 즉 정전 도장 장치 한 쌍을 나란히 배치하여 스테인리스 스틸(70) 강판의 이송 방향을 따라 도료를 스테인리스 스틸(70)의 표면에 분사시킨다.In order to achieve efficient electrostatic painting of STS430 stainless steel (70) steel sheets uncoiled from coils with a width of up to 1200 mm, a pair of bell painting equipment (41), i.e. electrostatic painting devices, are placed side by side to paint the stainless steel (70) steel sheets. The paint is sprayed on the surface of the stainless steel 70 along the transfer direction.
제4 단계(S4)에서는 내후성과 가공성 향상을 도모할 수 있을 것이다.In the fourth step (S4), weather resistance and processability can be improved.
이를 위하여, 고온 플라즈마 처리와 저온 플라즈마 처리 및 도장 처리는 연속적으로 실시되는 것이 바람직하다.For this purpose, it is preferable that the high-temperature plasma treatment, low-temperature plasma treatment, and painting treatment are performed continuously.
전술한 바와 같이 제2 단계(S2)의 고온 플라즈마 처리와 제3 단계(S3)의 저온 플라즈마 처리 및 제4 단계(S4)의 도장 처리는 휴게 시간 없이 연속적으로 이루어져야만 한다.As described above, the high-temperature plasma treatment in the second step (S2), the low-temperature plasma treatment in the third step (S3), and the painting treatment in the fourth step (S4) must be performed continuously without any rest time.
왜냐하면, 제2 단계(S2)의 고온 플라즈마 처리후 스테인리스 스틸(70) 표면의 전술한 고온 플라즈마 처리에 따른 수분 및 이물질 제거 효과는 1분 내외이면 상실되고, 제3 단계(S3)의 저온 플라즈마 처리후 스테인리스 스틸(70) 표면의 전술한 저온 플라즈마 처리에 따른 부동태피막 제거 효과는 역시 1분 내외이면 상실되기 때문이다. This is because, after the high-temperature plasma treatment in the second step (S2), the effect of removing moisture and foreign substances due to the above-described high-temperature plasma treatment on the surface of the stainless steel 70 is lost in about 1 minute, and the low-temperature plasma treatment in the third step (S3) This is because the effect of removing the passive film due to the above-described low-temperature plasma treatment on the surface of the stainless steel 70 is lost in about 1 minute.
따라서, 제2 단계(S2) 내지 제4 단계(S4)를 실시하는 고온 플라즈마 처리 장치와 저온 플라즈마 처리 장치 및 정전 도장 장치는 스테인리스 스틸(70)의 이송 방향을 따라 연속적으로 또는 일렬로 배치되어야 하는 것이다.Therefore, the high-temperature plasma processing device, the low-temperature plasma processing device, and the electrostatic coating device that perform the second step (S2) to the fourth step (S4) must be arranged continuously or in line along the transfer direction of the stainless steel 70. will be.
본 발명에 따른 고온 플라즈마 처리의 수분 제거후 저온 플라즈마 처리의 부동태피막 제거 및 이러한 수분 제거 상태와 부동태피막 제거 상태가 유지되는 동안 미세하고 균일한 도포가 가능한 벨 도장, 즉 정전 도장 방식으로 스테인리스 스틸(70)의 표면에 도료를 착색시키는 일련의 공정 설비를 틴티드 도장 시스템(Tinted painting system)이라 할 수 있다.After removing the moisture in the high-temperature plasma treatment according to the present invention, the passive film is removed in the low-temperature plasma treatment, and the stainless steel ( 70) A series of process equipment that colors paint on the surface can be called a tinted painting system.
제5 단계(S5)는 틴티드 도장 시스템을 통하여 착색이 완료된 스테인리스 스틸(70)을 요구하는 온도에 맞춰 건조시키는 공정이라 할 수 있다.The fifth step (S5) can be said to be a process of drying the stainless steel 70, which has been colored through a tinted painting system, to the required temperature.
제5 단계(S5)에서 스테인리스 스틸(70)은, 도 6에 도시된 바와 같이 이송되는 방향을 따라 건조 온도가 100℃부터 250℃까지 단계적으로 상승되도록, 복수의 서로 다른 건조 챔버(50)가 스테인리스 스틸(70)의 이송 방향을 따라 일렬로 배치되는 것이 바람직하다.In the fifth step (S5), the stainless steel 70 is placed in a plurality of different drying chambers 50 so that the drying temperature is gradually increased from 100° C. to 250° C. along the transfer direction as shown in FIG. 6. It is preferable that they are arranged in a row along the transport direction of the stainless steel 70.
서로 다른 복수의 건조 챔버(50)를 이송 방향을 따라 배치하는 것은, 제4 단계(S4) 완료후 스테인리스 스틸(70)에 착색된 도료의 과경화를 방지하기 위함이다.The purpose of arranging a plurality of different drying chambers 50 along the transport direction is to prevent overcuring of the colored paint on the stainless steel 70 after completion of the fourth step (S4).
제6 단계(S6)에서의 냉각은 건조 챔버(50)로부터 배출되는 스테인리스 스틸(70)이 이송되는 컨베이어(65) 하부측에 도 7(a)에 도시된 바와 같은 복수의 냉각팬(61) 가동에 의하여 이루어진다.Cooling in the sixth step (S6) is performed by using a plurality of cooling fans 61 as shown in FIG. 7(a) on the lower side of the conveyor 65 through which the stainless steel 70 discharged from the drying chamber 50 is transferred. It is accomplished by operation.
제6 단계(S6)에서, 도 7(b)와 같이 리코일러(62)에 대하여 스테인리스 스틸(70)을 리코일하기 전에 스테인리스 스틸(70)에 보호필름을 부착시키는 작업이 추가적으로 실시될 수도 있을 것이다.In the sixth step (S6), an additional operation of attaching a protective film to the stainless steel 70 may be performed before recoiling the stainless steel 70 to the recoiler 62 as shown in FIG. 7(b). .
이하, 본 출원인의 실제 제조 현장에서 스테인리스 스틸(70)의 도장 및 리코일링에 이르는 보다 구체적인 실시예에 대하여 다음과 같이 언급하고자 한다.Hereinafter, more specific examples of painting and recoiling of stainless steel 70 at the applicant's actual manufacturing site will be mentioned as follows.
원소재인 스테인리스 스틸(70)은 STS430이며, 최대 코일폭 1,200mm, 최대 중량은 5톤, 최대 길이는 1,300m이다.The raw material, stainless steel (70), is STS430, with a maximum coil width of 1,200 mm, a maximum weight of 5 tons, and a maximum length of 1,300 m.
입고된 스테인리스 스틸(70)의 육안 및 수입 검사를 실시하고, 제1 단계(S1) 실시를 위하여 호이스트나 코일 대차를 이용하여 스테인리스 스틸 코일을 이송한다.Visual and import inspection of the received stainless steel 70 is performed, and the stainless steel coil is transported using a hoist or coil bogie to perform the first step (S1).
언코일러(10)를 설치하고 스테인리스 스틸 코일을 거치한 다음, 스테인리스 스틸(70) 표면의 보호필름 또는 포장재를 회수하여 분리 제거한다.After installing the uncoiler (10) and mounting the stainless steel coil, the protective film or packaging material on the surface of the stainless steel (70) is recovered and removed.
제2 단계(S2)를 통하여 고온 플라즈마 처리하고 제3 단계(S3)를 통하여 저온 플라즈마 처리한 후 제4단계(S4)를 통하여 스테인리스 스틸(70) 표면에 도장 처리하는 것을 간격없이 연속적으로 실시한다.After high-temperature plasma treatment through the second step (S2) and low-temperature plasma treatment through the third step (S3), the surface of the stainless steel 70 is painted continuously without intervals through the fourth step (S4). .
도장처리가 완료된 스테인리스 스틸(70)을 100℃ 내지 250℃의 범위 내에서 스테인리스 스틸(70)의 이송 방향을 따라 점차 온도가 높아지게 설정된 건조 챔버(50)를 통과시키며 착색된 도료를 고온 건조시키는 제5 단계(S5)를 실시한다.A process for drying the colored paint at high temperature by passing the painted stainless steel (70) through a drying chamber (50) whose temperature is set to gradually increase along the transfer direction of the stainless steel (70) within the range of 100°C to 250°C. Carry out step 5 (S5).
이후 제6 단계(S6)에서 냉각팬(61)을 통하여 스테인리스 스틸(70)을 냉각시키고 리코일러(62)로 보내어 리코일링하기 전에 스테인리스 스틸(70) 표면의 도막 두께와 색차와 광택을 관리하고 도막의 외관 및 부착력을 검사한다.Thereafter, in the sixth step (S6), the stainless steel 70 is cooled through the cooling fan 61 and sent to the recoiler 62 to manage the film thickness, color difference, and gloss on the surface of the stainless steel 70 before recoiling. Inspect the appearance and adhesion of the coating film.
계속하여 제6 단계(S6)에서 리코일(62)측으로 리코일링하기 직전에 보호필름을 스테인리스 스틸(70) 표면에 부착시켜 함께 리코일링시킨다. Immediately before recoiling toward the recoil 62 in the sixth step (S6), a protective film is attached to the surface of the stainless steel 70 and recoiled together.
이렇듯, 제1 단계(S1) 내지 제6 단계(S6)는, 수요처 및 발주처에서 스테인리스 스틸(70) 표면에 형성되는 도막의 두께 요구조건에 맞춰서 적어도 2회 이상 반복 실시될 수 있을 것이다.In this way, the first step (S1) to the sixth step (S6) may be repeated at least twice or more in accordance with the requirements for the thickness of the coating film formed on the surface of the stainless steel 70 at the customer and ordering place.
따라서, 본 출원인은 실제 제조 현장에서 제1 단계(S1) 내지 제6 단계(S6)를 통하여 스테인리스 표면에 4~5㎛ 두께의 프라이머를 도포한 후, 재차 제1 단계(S1) 내지 제6 단계(S6)를 실시하여 12~14㎛ 두께의 특정 색상 도료를 도포함으로써 최종 출고 제품을 제작할 수 있었다.Therefore, the present applicant applied a 4-5㎛ thick primer to the stainless steel surface through the first step (S1) to the sixth step (S6) at an actual manufacturing site, and then again applied the primer to the first step (S1) to the sixth step. By performing (S6) and applying a specific color paint with a thickness of 12 to 14㎛, the final shipped product was manufactured.
따라서, 상기와 같은 본 발명의 다양한 실시예에 따른 제조 방법을 통하여 도 8에 도시된 바와 같이 다양한 색상의 틴티드 스테인리스 스틸(tinted stainless steel, 71~74)이 생산되고, 도료가 확실하고 깔끔하게 착색된 틴티드 몰딩 부품(75)들 또한 생산될 수 있는 것이다.Therefore, through the manufacturing method according to various embodiments of the present invention as described above, tinted stainless steel (71 to 74) of various colors is produced as shown in FIG. 8, and the paint is clearly and neatly colored. Tinted molded parts 75 can also be produced.
이상과 같이 본 발명은 일반적인 롤 투 롤 방식으로 연속 공정을 통한 다양한 색상의 도막 형성이 가능하게 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법을 제공하는 것을 기본적인 기술적 사상으로 하고 있음을 알 수 있다.As described above, it can be seen that the basic technical idea of the present invention is to provide a method for manufacturing colored stainless steel using plasma treatment, which enables the formation of a coating film of various colors through a continuous process in a general roll-to-roll method.
그리고, 본 발명의 기본적인 기술적 사상의 범주 내에서 당해 업계 통상의 지식을 가진 자에게 있어서는 다른 많은 변형 및 응용 또한 가능함은 물론이다.And, of course, many other modifications and applications are possible for those skilled in the art within the scope of the basic technical idea of the present invention.

Claims (5)

  1. 언코일링되어 일방향으로 공급된 스테인리스 스틸의 표면에 고온 플라즈마 처리하여 상기 스테인리스 스틸 표면의 수분을 제거한 후 저온 플라즈마 처리하고 상기 부동태피막을 제거하여 상기 스테인리스 스틸의 표면에 도장 처리함으로써 착색되는 것을 특징으로 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법.The surface of stainless steel that has been uncoiled and supplied in one direction is treated with high-temperature plasma to remove moisture from the stainless steel surface, then treated with low-temperature plasma, the passivation film is removed, and the surface of the stainless steel is painted, thereby coloring the stainless steel. Method for manufacturing colored stainless steel using plasma treatment.
  2. 청구항 1에 있어서, In claim 1,
    상기 고온 플라즈마 처리시 상기 스테인리스 스틸의 표면에 적용되는 화염 온도는 600℃ 내지 800℃이며, The flame temperature applied to the surface of the stainless steel during the high-temperature plasma treatment is 600°C to 800°C,
    상기 저온 플라즈마 처리시 상기 스테인리스 스틸의 표면 온도는 상온으로 유지되는 것을 특징으로 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법.A method of manufacturing colored stainless steel using plasma treatment, characterized in that the surface temperature of the stainless steel is maintained at room temperature during the low-temperature plasma treatment.
  3. 코일 형태로 권취된 스테인리스 스틸을 언코일러(uncoiler)에 안착시키고 언코일링하여 일방향으로 공급하는 제1 단계; A first step of seating stainless steel wound in a coiled form on an uncoiler, uncoiling it, and supplying it in one direction;
    상기 스테인리스 스틸의 표면에 600℃ 내지 800℃의 LPG와 산소 혼합 가스로 형성되는 화염으로 6 내지 18초간 분사하는 고온 플라즈마 처리에 의해, 상기 스테인리스 스틸의 표면을 40℃ 내지 100℃로 유지시킴으로써, 상기 스테인리스 스틸 표면의 수분을 제거하는 제2 단계; By maintaining the surface of the stainless steel at 40°C to 100°C by high-temperature plasma treatment by spraying the surface of the stainless steel with a flame formed of LPG and oxygen mixed gas at 600°C to 800°C for 6 to 18 seconds, A second step of removing moisture from the stainless steel surface;
    상기 스테인리스 스틸의 표면에 7000V 내지 8000V의 방전 전압을 0.1초 내지 3초 동안 적용하는 저온 플라즈마 처리에 의해, 상기 스테인리스 스틸의 표면을 상온으로 유지시킴으로써, 상기 스테인리스 스틸의 부동태피막을 제거하는 제3 단계; A third step of removing the passive film of the stainless steel by maintaining the surface of the stainless steel at room temperature through low-temperature plasma treatment by applying a discharge voltage of 7000V to 8000V for 0.1 to 3 seconds to the surface of the stainless steel. ;
    도장 부스로 투입되어 일방향으로 이송되는 상기 부동태피막이 제거된 상기 스테인리스 스틸의 표면에, 상기 도장 부스의 천장측으로부터 바닥측을 향하여 특정 색상의 도료를 강제 분사하는 정전 도장 장치에 의해 15℃ 내지 25℃를 유지하며 도장 처리함으로써, 상기 특정 색상의 도료를 착색시키는 제4 단계; 15°C to 25°C by an electrostatic painting device that forcibly sprays paint of a specific color from the ceiling side of the painting booth toward the floor side of the stainless steel surface from which the passive film has been removed, which is introduced into the painting booth and transported in one direction. A fourth step of coloring the paint of the specific color by painting while maintaining it;
    건조 챔버로 투입되어 착색이 완료된 상기 스테인리스 스틸을 100℃ 내지 250℃의 온도에서 건조시키는 제5 단계; 및 A fifth step of drying the stainless steel that has been colored by entering it into a drying chamber at a temperature of 100°C to 250°C; and
    건조가 완료된 상기 스테인리스 스틸을 냉각시키고 리코일(recoil)하는 제6 단계를 포함하는 것을 특징으로 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법.A method for producing colored stainless steel using plasma treatment, comprising a sixth step of cooling and recoiling the dried stainless steel.
  4. 청구항 1 또는 청구항 2에 있어서, In claim 1 or claim 2,
    상기 고온 플라즈마 처리와 상기 저온 플라즈마 처리 및 상기 도장 처리는 연속적으로 실시되는 것을 특징으로 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법.A method of manufacturing colored stainless steel using plasma processing, wherein the high-temperature plasma treatment, the low-temperature plasma treatment, and the painting treatment are performed continuously.
  5. 청구항 2에 있어서, In claim 2,
    상기 제5 단계에서 상기 스테인리스 스틸은, In the fifth step, the stainless steel,
    이송되는 방향을 따라 건조 온도가 상기 100℃부터 상기 250℃까지 단계적으로 상승되도록, 복수의 서로 다른 건조 챔버가 상기 스테인리스 스틸의 이송 방향을 따라 일렬로 배치되는 것을 특징으로 하는 플라즈마 처리를 이용한 착색 스테인리스 스틸의 제조 방법.Colored stainless steel using plasma treatment, characterized in that a plurality of different drying chambers are arranged in a row along the transfer direction of the stainless steel so that the drying temperature gradually increases from 100 ° C to 250 ° C along the transfer direction. How to make steel.
PCT/KR2023/006580 2022-05-23 2023-05-16 Colored stainless steel manufacturing method using plasma processing WO2023229275A1 (en)

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