KR200187498Y1 - A manufacturing Apparatus of waveform steel pipe which Polyethylene sheet welded to the inside and outside wall by high - frequency induction heating - Google Patents

A manufacturing Apparatus of waveform steel pipe which Polyethylene sheet welded to the inside and outside wall by high - frequency induction heating Download PDF

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Publication number
KR200187498Y1
KR200187498Y1 KR2019990025796U KR19990025796U KR200187498Y1 KR 200187498 Y1 KR200187498 Y1 KR 200187498Y1 KR 2019990025796 U KR2019990025796 U KR 2019990025796U KR 19990025796 U KR19990025796 U KR 19990025796U KR 200187498 Y1 KR200187498 Y1 KR 200187498Y1
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South Korea
Prior art keywords
steel pipe
sheet
corrugated
frequency induction
induction heating
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KR2019990025796U
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Korean (ko)
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김한곤
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김한곤
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/08—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by combined methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/10—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form into a peculiar profiling shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
    • B21D39/021—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder for panels, e.g. vehicle doors
    • B21D39/023—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder for panels, e.g. vehicle doors using rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/28—Associations of cutting devices therewith
    • B21D43/287—Devices for handling sheet or strip material

Abstract

본 고안은 아연도강판 표면과 이면에 폴리에틸렌 시트를 고주파 유도가열에 의하여 용착하여 소재철판을 제조하고 이러한 폴리에틸렌시트 피복강판을 파형절곡하여 주벽이 파형주름이 형성된 폴리에틸렌시트피복파형강관을 일관작업으로서 적은 작업인원과 청결한 작업분위기에서 제조하되 특히 고주파 유도가열에 의하여 깨끗하고 신속한 용착작업을 행하므로서 공기오염이 없이 파형강관을 균일하게 대량생산할 수 있도록 한 고안에 대한 것이다.The present invention manufactures steel sheet by welding polyethylene sheet on the surface and the back of galvanized steel sheet by high frequency induction heating and bending the polyethylene sheet-coated steel sheet to form a corrugated sheet with corrugated wrinkles. It is designed to manufacture uniformly mass production of corrugated steel pipe without air pollution by performing clean and quick welding work by high frequency induction heating.

Description

내, 외주벽에 폴리에틸렌시트가 고주파 유도가열에 의해 용착된 파형강관 제조장치{A manufacturing Apparatus of waveform steel pipe which Polyethylene sheet welded to the inside and outside wall by high - frequency induction heating}A manufacturing Apparatus of waveform steel pipe which Polyethylene sheet welded to the inside and outside wall by high-frequency induction heating}

본 고안은 내 외주면에 폴리에틸렌시트가 용착된 파형강관을 일관작업으로 제조하는 장치분야에 대한 것으로 통상적으로 하수를 처리하기 위하여 지하에 매설되는 배수구조물은 콘크리트재로 되는 흄관을 주로 사용하게 되나 흄관 제조하기 위한 원,부자재인 골재등의 국내부존자원부족과 환경생태 보전으로 인한 골재 채취의 난항으로 제품공급량이 절대 부족하여 콘크리트 배수구조물의 수급차질로 인한 공기지연등의 제문제가 있어 현금에는 철판제(아연도 강판)강판을 나선파형강관으로 제조하여 이 나선파형강관으로 콘크리트 흄관을 대체하도록 하고있는 바 이 강판재 강관은 부식을 고려하여 아연도금 강판을 사용하고 있으나 강관의 제작, 운반 시공등을 함에 있어서 표면에 쉽게 흠집이 생겨 빠른 속도로 부식이 되므로 이를 방지하기 위하여 파형강관을 일정길이로 성형한 다음 이 파형강관 내,외주면에 분말 용착식 방법으로 폴리에틸렌을 피복한 강관이 제공되고 있다.The present invention is for the field of apparatus for manufacturing corrugated steel pipes with polyethylene sheets deposited on the inner and outer circumferential surfaces. The drainage structure buried underground for the treatment of sewage is usually made of concrete. Due to the lack of domestic resources such as raw and subsidiary aggregates, and the difficulty of collecting aggregates due to environmental conservation, there is a problem that there is a problem such as air delay due to supply and demand problems of concrete drainage structure. (Galvanized steel sheet) Steel plate is made of spiral corrugated steel pipe to replace concrete fume pipe with spiral corrugated steel pipe. This steel plate is made of galvanized steel sheet to prevent corrosion, In order to prevent this, because the surface is easily scratched and corroded quickly. For example, steel pipes formed by forming a corrugated steel pipe to a certain length and then coated with polyethylene on the inner and outer circumferential surfaces of the corrugated steel pipe are provided.

상기 폴리에틸렌용착피복파형강관은 파형으로 형성되므로 좌굴하중에 강하고 충격을 용이하게 흡수하며 수분침투 및 흡수가 거의 없고 산, 알카리에 대한 내약품성 및 내식성, 내구성이 우수한 제품으로 인정되고 있으나 상기와 같은 파형강관 내, 외주면에 폴리에틸렌 분말을 용착하는 방식은 파형강관에 일정한 온도가 되도록 가스를 연소시켜서 발생되는 열을 가열하고 파형강관 표면에는 자동, 또는 반자동등의 바이브레이터에 의하여 분말을 뿌려서 일정한 두께로 용착되게 하고 강관 내주면에는 수공으로 삽등을 사용하여 폴리에틸렌분말을 투입하게 되므로 폴리에틸렌 용착층이 균일하지 못할 뿐 아니라 분말 투입등의 작업시 분말이 공기중에 비산되어 작업환경이 매우 열악하고 작업자의 건강에도 악영향을 미치게 되며 이러한 작업을 하기 위한 별도의 작업공간이 필요하므로서 제품생산설비투자액이 엄청나게 소요되고 생산인원과다로 인건비 상승 및 가스를 연소시킴에 따라 화제위험등의 여러문제점이 상존하여왔다.The polyethylene coated corrugated corrugated steel pipe is formed into a wave shape, so it is strong in buckling load, easily absorbs impact, has little penetration and absorption of water, and is recognized as a product having excellent chemical resistance, corrosion resistance, and durability against acids and alkalis, The method of welding polyethylene powder on the outer circumferential surface of the steel pipe heats the heat generated by burning the gas to a certain temperature in the corrugated steel pipe, and sprays the powder on the surface of the corrugated steel pipe by vibrators such as automatic or semi-automatic to be welded to a certain thickness. In addition, since the polyethylene powder is injected into the inner circumferential surface of the steel pipe by hand using a shovel, the polyethylene welding layer is not uniform, and the powder is scattered in the air during the powder injection, and the working environment is very poor and adversely affects the health of workers. To do this As a separate working space is required, the investment of product production equipment is enormous, and there are many problems such as fire risk due to the increase of labor cost and the burning of gas due to the excessive production staff.

도 1 은 본 고안상으로 실시되는 내, 외주벽에 폴리에틸렌시트가 용착된 파형강관의 제조공정도1 is a manufacturing process diagram of the corrugated steel pipe welded polyethylene sheet on the inner, outer circumferential wall carried out in accordance with the present invention

도 2 는 도 1 에서 폴리에틸렌시트가 용착된 철판을 파형으로 절곡하는 철판파형절곡기의 측면개략도Figure 2 is a side schematic view of the iron plate waveform bending machine for bending the iron sheet welded polyethylene sheet in Figure 1

도 3 은 본 고안상으로 실시되는 파형강관의 소재 철판 단면도Figure 3 is a cross-sectional view of the raw material of corrugated steel pipe is carried out according to the present invention

도 4 는 본 고안상으로 제조되는 파형강관 이음매(Lock seam)구조를 나타내는 파형강관 횡단면도Figure 4 is a cross-sectional view of the corrugated steel pipe showing the structure of the corrugated steel pipe (Lock seam) manufactured by the present invention

도 5 는 본 고안상으로 제조된 파형강관 외관사시도5 is a perspective view of a corrugated steel pipe manufactured according to the present invention

(도면의 주요부분에 대한 부호설명)(Code description of main parts of drawing)

1.언코일러(Un-coiler) 2.철판 3. 쇼트 브라스터(Shot-Blast)1. Un-coiler 2. Iron plate 3. Shot-Blast

4.분사노즐 5.고주파유도가열기(High-frequency induction heating M/C)4. Spray nozzle 5. High-frequency induction heating M / C

6,6a.권치롤 7,7a.폴리에틸렌시트 8,8a.상하압착롤러6,6a.Sound roll 7,7a.Polyethylene sheet 8,8a.Up and down compression roller

9.P.E 시트용착기 10.쿨링턴넬(coolling Tunnel)9.P.E Sheet Welder 10. Cooling Tunnel

11,11a,.....11n,11an. 상하파형절곡롤러 12.파형절곡기11,11a, .... 11n, 11an. Vertical Wave Bending Roller 12.Wave Bending Machine

13.제관로울러 14.제관기 15.이음매(Lock Seam)13. Canning roller 14. Canning machine 15. Lock seam

P.파형관 S.제품소재판 Sa.파형절곡판P. Wave Tube S. Product Material Plate Sa. Wave Curved Plate

본 고안은 상기와 같은 종래에 발생되었던 여러문제점을 해결하고 풀리에틸렌수지피복파형강관의 우수한 점만을 발휘할 수 있도록 하면서도 그 작업공정을 재료 철판의 인입부터 파형강관완성품의 제조까지를 쾌적한 작업환경하에서 일관 작업공정으로 생산하도록 장치를 구성하므로서 환경오염문제와 제품의 균일화에 따르는 제품의 신뢰성을 확보할 수 있도록 철판 표리면에 미리 판상으로 구비된 상하 2 개소에 폴리에틸렌시트롤을 구비하여 청정에너지 기술인 고주파유도가열(高周波誘導加熱 : high - frequency induction heating)에 의한 폴리에틸렌피복층을 용착한 다음 이 폴리에틸렌피복층이 표리면에 용착된 강관제조용 철판을 파형으로 연속적으로 절곡형성하면서 전진 이동시킴과 아울러 그 선단부를 소정의 비틀림 각도(Twist angle)로 원호로 절곡하여 일정한 직경의 파형 강관이 될 수 있도록 제관공정을 거쳐 그 나선 대접부 이음매를 록심(Lock seam)하므로서 폴리에틸렌시트 용착파형강관을 일관작업으로 연속제조하게 되는 바 이를 첨부한 도면에 의거하여 상술하면 다음과 같다.The present invention solves the various problems that occurred in the related art as described above, and can exhibit only the excellent points of the pulley polyethylene resin coated corrugated steel pipe, and the work process is consistent under the comfortable working environment from the introduction of the steel sheet to the manufacture of the finished corrugated steel pipe. In order to secure the reliability of the product due to the environmental pollution problem and the uniformity of the product by constructing the device in the work process, the polyethylene sheet is provided on the upper and lower sides of the front and back of the iron plate in advance so that the high frequency induction is a clean energy technology. After the polyethylene coating layer is deposited by high-frequency induction heating, the polyethylene coating layer continuously moves forward while bending the steel pipe manufacturing steel plate fabricated on the front and back in a wave form, Bending in circular arc at twist angle Through the manufacturing process to make corrugated steel pipes of constant diameter, the seam of the spiral seam is continuously manufactured by the continuous operation of polyethylene sheet welded corrugated steel pipes by locking seam. Same as

본 고안상으로 실시되는 폴리에틸렌(이하 P.E라 함)시트 용착파형강관(P)을 제조하기 위한 장치는 먼저 소정의 폭으로 절단된 철판(아연도 강판)코일이 권치된 언- 코일러(Un-coiler)(1) 로 부터 철판(2)이 쇼트브라스터(Shot Blast)(3)기로 수평적으로 장입되면 쇼트 브라스터(3) 내부에 상하로 장착된 다수개의 분사노즐(4)에 의하여 강한 압력으로 토출되는 쇼트볼들이 철판(2) 표리면을 타격하여 이 충돌 충격에 의하여 철판(2)표리면에 점착된 피막등의 불순물을 탈리 처리하게하고 이 쇼트 브라스터(3)로 부터 나온 철판(2)은 연속적으로 고주파 유도가열기(high -frequency induction heating M/C)(5)에 수평장입되어 철판(2)표리면을 일정한 온도(온도범위 120℃ ~ 500℃)로 순간적으로 가열하게 되고 이렇게 일정한 온도로 가열된 철판(2)은 P.E시트 용착기(9)에 장입하되 P.E시트 용착기(9)는 상, 하에 각각 별도로 구비된 권치롤(6)(6a)에 권치된 소정두께의 P.E시트(7)(7a)가 철판(2)표면과 이면에 장착된 다수쌍의 상하압착롤러(8)(8a)의 압착에 의하여 압착되면서 철판(2)에 개재된 고열에 의하여 표리면에 P.E시트 대접면이 용융 부착되어 P.E시트가 피복된 파형강관의 제품소재판(S)이 1 차 가공되되 이 때 철판(2)의 이송속도와 P.E시트 공급속도는 동일하다. 1 차 가공된 제품소재판(S)은 계속하여 이동하면서 고주파 유도가열기(5)로부터 흡열된 고온을 대기중의 상온과 유사하게 온도를 하강시키는 쿨링턴넬(coolling Tunnel)(10)을 거치므로서 상온으로 냉각된 상태에서 계속이동하여 파형절곡기(12)의 상하로 구비된 다수쌍의 파형절곡롤러(11)(11a)...(11n)(11na)를 지나면서 일정한 피치의 요철 파형절곡판(Sa)으로 절곡되므로서 2 차 가공되고 2 차가공된 일정한 피치의 요철파형판(Sa)은 계속이송하여 파형관(P)의 직경을 제관로울러(13)의 상하위치조정에 의하여 임의로 조정하여서 되는 제관기(14)를 거치면 요철파형판(Sa)은 소정의 비틀림각도(Twist angle)상태로 원호로 나선절곡되면서 3차 가공되므로서 파형관(P)이 완성되도록 본 고안상의 폴리에틸렌시트가 용착된 파형강관이 일관공정으로 제조된다.The apparatus for producing a polyethylene (hereinafter referred to as PE) sheet welded corrugated steel pipe (P) according to the present invention is first manufactured by winding an uncoiler (Un-coiler) coiled with an iron plate (zinc steel sheet) cut to a predetermined width. When the iron plate 2 is horizontally charged from the coiler 1 to the shot blaster 3, it is strong by a plurality of injection nozzles 4 mounted up and down inside the shot blaster 3. The shot balls discharged under pressure hit the front and back surface of the iron plate (2) to remove the impurities such as the film adhered to the front and back surface of the iron plate (2) by this collision impact, and the iron plate from the shot braster (3). (2) is continuously loaded horizontally into high-frequency induction heating (M / C) (5) to instantaneously heat the surface of the iron plate (2) to a constant temperature (temperature range 120 ℃ ~ 500 ℃) The steel sheet (2) heated to a constant temperature is loaded into the PE sheet welding machine (9), but the PE sheet The welding machine 9 has a plurality of pairs of vertical presses of PE sheets 7 and 7a of predetermined thickness wound on the winding rolls 6 and 6a provided separately on the upper and lower sides. The product material plate (S) of the corrugated steel pipe coated with PE sheet is melt-attached to the front and back surface by the high temperature interposed on the iron plate (2) by pressing the roller (8) (8a). In this case, the feed rate and the sheet feed rate of the iron sheet (2) is the same. Since the primary processed product material plate (S) continues to move through a cooling tunnel (10) that lowers the temperature of the high temperature absorbed from the high-frequency induction heater (5) similar to the normal temperature in the air. In the state of cooling to room temperature, and continues to move up and down a plurality of waveform bending rollers (11) (11a) (11n) (11na) provided above and below the waveform bending machine (12) The uneven wavy plate Sa of the constant pitch, which is secondary and secondary processed while being bent into the bending plate Sa, is continuously transferred to arbitrarily adjust the diameter of the corrugated pipe P by adjusting the up and down position of the steel tube roller 13. The uneven corrugated plate (Sa) is subjected to a three-dimensional process while spirally bending in a circular arc at a predetermined twist angle to weld the polyethylene sheet of the present invention to complete the corrugated pipe (P). Corrugated steel pipe is manufactured in a consistent process.

이 때 파형강관은 제관기(13)에 의하여 제관성형될 시 나선원호로 절곡되므로 그 나선대접부의 이음매(15)를 록심(Lock weam)이음이 되도록 제관한다.At this time, since the corrugated steel pipe is bent into a spiral arc when the steel tube is formed by the steel tube 13, the seam 15 of the spiral weld portion is piped so as to become a lock weam.

상기와 같이 고주파 유도가열기(5)에 의하여 1차 가공과 파형절곡기(12)에 의하여 2 차 가공되고 제관기(14)에 의하여 3 차 완성된 파형관(9)을 제조하도록 하므로서 종래 폴리에틸렌 분말 용착식 피복파형강관을 제조할 시의 제문제점인 별도의 작업공간이 필요없음에 따른 막대한 시설비가 소요되는 생산시설이 필요없고 일관 작업을 함에 따라 많은 인원이 필요없으며 가스를 사용함에 따른 화재위험이 없으며 P.E분말을 뿌리기때문에 발생되는 환경오염에 따르는 문제점이 원천적으로 제거될 뿐 아니라 특히 P.E시트의 피복은 고주파유도가열에 의한 용착방식이므로 제품의 균일성을 확보하므로 제품 신뢰성을 높이는 등의 효과가 있다.As described above, the conventional polyethylene powder is prepared by the high frequency induction heater (5) and the secondary processing by the corrugation bending machine (12) and the third finished corrugated pipe (9) by the tube making machine (14). There is no need for a production facility that requires enormous facility costs due to the need for a separate work space, which is a problem in the manufacture of welded corrugated corrugated steel pipes. In addition, the problems caused by environmental pollution caused by spraying PE powder are not only eliminated at the source, but also the PE sheet's coating is a welding method by high frequency induction heating. .

Claims (1)

내, 외주면에 폴리에틸렌시트가 용착된 파형강관을 제조하기 위하여 일정한 폭과 길이의 철판(아연도강판)(2)을 권치한 언-코일러(Un -Colier)(1)로부터 철판(2)을 쇼트브라스터(Shot Blaster)(3)로 수평장입하여 쇼트브라스터(3)내부에 장착된 분사노즐(4)에서 토출되는 쇼트볼의 타격에 의하여 철판(2)표리면의 불순물을 탈리처리한 다음 철판(2)을 진행시켜 고주파 유도가열기(5)(high -Frequency Induction heating M/C)를 통과시키므로서 철판(2)을 일정한 온도(120℃~500℃)로 순간 가열하고 이 고온으로 가열된 철판(2)의 고온에 의하여 P.E시트 용착기(9) 내부 상,하측에 구비된 P.E시트(7)(7a)가 철판(2) 표리면에 용착 피복되고 이러한 제품소재판(S)은 쿨링턴넬(coolling Tunnel)(9)을 경유하여 상온으로 냉각된 상태에서 파형절곡기(12)에 의하여 일정한 피치로 파형절곡판(Sa)이 형성되고 이 파형절곡판(Sa)은 계속 진행하여 제관기(14)를 통과하면서 소정의 비틀림각도로 나선절곡되면서 파형강관(9)이 형성됨과 동시에 이 파형강관(9)의 나선 대접부 선단을 나선이음매(13)(Lock seam)로 이음하여서 제조되도록하는 내, 외주벽에 폴리에틸렌시트가 고주파 유도가열에 의해 용착된 파형강관제조장치.In order to manufacture a corrugated steel pipe in which polyethylene sheets are welded on the inner and outer circumferential surfaces thereof, a steel sheet 2 is unrolled from an uncoiler 1 wound around a steel sheet of a predetermined width and length. Desorption of impurities on the front and back surface of the iron plate (2) by hitting the shot ball discharged from the injection nozzle (4) mounted in the shot blaster (3) horizontally by the shot blaster (3) Next, the iron plate 2 is advanced to pass a high-frequency induction heating M / C, thereby instantaneously heating the iron plate 2 to a constant temperature (120 ° C. to 500 ° C.). Due to the high temperature of the heated iron plate 2, the PE sheets 7 and 7a provided on the upper and lower sides of the PE sheet welding machine 9 are welded and coated on the front and back surfaces of the steel sheet 2, and the product material plate S is The waveform bending plate Sa is formed at a constant pitch by the waveform bending machine 12 while being cooled to room temperature via a cooling tunnel 9. The corrugated bending plate Sa continues to pass through the steel tube 14 and spirally bends at a predetermined torsion angle to form a corrugated steel pipe 9, and at the same time, helix the end of the spiral weld of the corrugated steel pipe 9 Corrugated steel pipe manufacturing apparatus in which a polyethylene sheet is welded to the inner and outer circumferential walls by welding with a seam (13) (Lock seam) by high frequency induction heating.
KR2019990025796U 1999-11-23 1999-11-23 A manufacturing Apparatus of waveform steel pipe which Polyethylene sheet welded to the inside and outside wall by high - frequency induction heating KR200187498Y1 (en)

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KR20010048311A (en) * 1999-11-26 2001-06-15 안우정 double PE sheet corrugated steel pipe, apparatus and method thereof
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KR101984871B1 (en) 2019-01-03 2019-05-31 주식회사 뉴펠 Coated corrugated steel pipe with a film that is easy to repair the damaged coating layer
KR102032202B1 (en) 2019-05-16 2019-10-15 (주) 한국유화 Coated corrugated steel pipe with a film that is easy to repair the damaged coating layer
KR102004726B1 (en) 2019-05-17 2019-07-29 대한강관 주식회사 Cladding waveguide with film that is easy to combine with organic compounds

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