US3850660A - Method for coating the inner surface of metal pipes - Google Patents

Method for coating the inner surface of metal pipes Download PDF

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Publication number
US3850660A
US3850660A US00342939A US34293973A US3850660A US 3850660 A US3850660 A US 3850660A US 00342939 A US00342939 A US 00342939A US 34293973 A US34293973 A US 34293973A US 3850660 A US3850660 A US 3850660A
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US
United States
Prior art keywords
pipe
coating
metal pipe
particles
interior
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00342939A
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English (en)
Inventor
T Okoshi
K Inamura
T Tatsuno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kansai Paint Co Ltd
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Kansai Paint Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kansai Paint Co Ltd filed Critical Kansai Paint Co Ltd
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Publication of US3850660A publication Critical patent/US3850660A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0645—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies the hollow bodies being rotated during treatment operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/12—Plant for applying liquids or other fluent materials to objects specially adapted for coating the interior of hollow bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Definitions

  • ABSTRACT A method for coating the inner surface of a metal pipe having an inner diameter of about 1 to 15 cm, which comprises feeding negatively charged dry particles of a coating compositioninto the interior of said metal pipe electrically grounded from one end of the pipe, sucking air at the same time from the other end of the 'metal pipe so as to form an air stream carrying the particles-and flowing in the interior of the pipe at a flow rate of about 2 to 15 m/sec and to allow the particles to deposit electrostatically on the inner surface of the pipe, and fusing the deposited particles at a reduced pressure of
  • One object of the invention is accordingly to provide a method for coating the interior of'a metal pipe, which is capable of forming a uniform and continuous coating having excellent surface-smoothness free from pinholes on the inner surface of the pipe having such a small inner diameter as about 1 to cm.
  • uniform and continuous fllm coating free from pinhole can be produced on the inner surface of a metal pipe having such a small inner diameter that it has been difficult or impossible to form such a uniform pinhole-free film on the inner surface thereof by the conventional methods.
  • the inner surface of a metal pipe having an inner diameter smallerthan about 15 cm, particularly-about l to 10 cm can be effectively coated by the method of the invention.
  • the method of this invention makes it possible to form a continuous coating film having excellent surface-smoothness on the inner surface of a pipe not greater than about 15 cm in its inner diameter.
  • the metal pipe which can be coated by the invention includes those having an inner diameter of about l to 15 cm and made of steel, stainless-steel,-aluminum, copper and like metals.
  • polyvinyl chloride polyethylene, polypropylene, polyamide, polyester, chlorinated polyether, epoxy resin, phenol resin, polyvinyl fluoride and like thermoplastic or thermosetting resins
  • a coating composition in the invention in the form of dry powder, to which may be added, if necessary, plasticizers, stabilizers, coloring agents and like additives.
  • Preferable particle size of the cocating compositions is in the range of about several microns to 500 a.
  • the machine for giving electrostatic charge to the particles of the coating composition may be used various dry electrostatic coating machines available under the Trade Mark, such as REP Gun” sold by Ransberg Japan Ltd., Stajet and-*Stafluid by Societe Anonyme de Machines Electrostatician, France, etc.
  • a metal pipe to be coated is electrically grounded.
  • the metal pipe is preferably positioned horizontally, though it may be positioned vertically or in any direction desired.
  • dry powder of the coating composition is fed continuously into the interior of the pipe by a suitable dry electrostatic coating machine.
  • air is sucked from the other end of the pipe by a suitable sucking device, such as suction pump, suction fan, etc.,- whereby an air stream is produced in the interior of the pipe.
  • the dry powder fed from one end, while being carried by such air stream is deposited electrostatically on the inner surface of the grounded pipe, resulting in uniform deposition of the powder on the entire surface of the pipe.
  • the flow rate of the air stream flowing in the interior of the pipe in the range of about 2 to 15 m/sec.
  • the powder is mainly deposited on a portion near the inlet of the pipe without uniform deposition being effected over the entire inner surface of the pipe, and at a higher flow rate of about 15 m/sec almost all powder particles are carried away with air and effective deposition can no longer be achieved.
  • Particularlypreferable flow rate is in the range of @to 13 mlsec. a '7
  • the preferable rotation rate may be about to 50 r.p.m. though it may be increased to such a high rate as about 200 r.p.m.
  • the powder thus deposited on the inner surface of the pipe is then heated to fuse into a continuous coating film at a temperature lower than the decomposition temperature of the composition but higher than the melting point thereof.
  • it is essential to fuse the composition especially at a reduced pressure of up to 100 mm Hg, preferably to 70 mm Hg, in terms of absolute pressure.
  • the fusing conducted at the reduced pressure of up to I00 mm Hg achieves an outstanding effect of imparting remarkably improved surface-smoothness to the continuous coating film obtained.
  • the continuous smooth coating formed on the inner surface of pipe reduces the resistance to fluids when the pipe is used for conveying water and other fluids, assuring a great advantage in the transportation of fluids. As the absolute pressure increases over 100 mm Hg, the surface-smoothness tends to reduce.
  • the interior pressure of the hollow metal pipe must be at a level not exceeding I00 mm Hg when the powder deposited on its inner surface is substantially fused. Accordingly, the interior pressure may be reduced to the above-mentioned level before or when the deposited powder reaches a temperature at which it starts to fuse. If the pressure is reduced after the deposited powder has already started fusing, a smooth-surfaced continuous film will not be formed on the inner surface of the pipe.
  • the reduced pressure to be applied is up to I00 mm Hg, preferably in the range of about 10 to 70 mm Hg.
  • the pressure reducing means is not limited in any way, but various means such as vacuum pump can be used effectively.
  • the thickness ofthe film thus obtained may vary over a wide range in accordance with the kinds of the coating compositions used and the time for coating, but usually it is in the range of about 100 to 700 u.
  • the metal pipe to be coated may be preheated at a temperature I of from a softening point of the coating composition to bellow a metling point thereof.
  • softening point shows a value measured in accordance with ASTM D 1525-58 T
  • melting point shows a value determined in accordance with ASTM D 1238-57 T, using a load of 2,160 g at a flow rate of lOi 1 g/lO min.
  • FIG. 1 shows a side view partically in section of one preferred apparatus for carrying out the method of the invention
  • FIG. 2 is a front view of rotating means shown in FIG.
  • a couple of rotating means for a metal pipe to be coated each of which comprises a driving roll 2, idle roll 3, set roll 4'and supporting means 5 for these rolls.
  • the driving roll 2 and idle roll 3 are rotatably supported on shafts 6 and 7 on the supporting means 5, and the driving roll 2 is driven by bevel gears 8 and 9 which are driven through a reduction gear (not shown) by a motor (not shown), these reduction gear and motor being disposed in a case 10.
  • the set roll 4 is rotatably supported on an arm 11 fixed to supporting means 5 with a screw 12.
  • a metal pipe A the inner surface of which is to be coated, is electrically grounded and mounted horizontally on the couple of rotating means 1 and held in posi tion by the set roll 4 so as to be rotated by means of the driving roll 2.
  • the metal pipe A is airtightly connected to a baffle 14 at the front end and to a rubber pipe 15 at the back end by means of socket and spigot joints 16 and union joints 17 respectively. Each union joint is supported by a frame 18.
  • Designated at 13 is a heating furnace for the pipe A.
  • the rubber pipe 15 is connected to a powder recovery hopper l9, and is further connected to air-sucking means (not shown) with a powder recovery box 20 disposed therebetween.
  • the box is provided with a bag filter or screen 21 to prevent escape of the powder.
  • Designated at 22 is a barrel head of a dry electrostatic coating machine (not shown).
  • the pressure reducing means may usually be a vacuum pump.
  • the electrostatically coated hollow pipe is placed in an oven, and one end of the pipe is tightly closed with a heatresistant rubber cork, with the other end connected to the suction opening of a vacuum pump.
  • the pipe mounted on the rotating means 1 and electrically grounded was rotated at 5 r.p.m. and heated at a temperature of about C.
  • a powdery coating composition comprising epoxy resin, hardener and pigment and having the particle size of 20 to p. was charged negatively to a voltage of -90 KV and blown through the electrostatic gun head 22, REP Gun" (Trade Mark), to the baffle 14 at the rate of 300 g/min.
  • REP Gun Trade Mark
  • the dry powder blown was carried by the air stream and deposited electrostatically on the inner surface of the pipe. This procedure was continued for 2 minutes.
  • the hollow steel pipe A with the coating composition electrostatically deposited on its inner surface was tightly closed at its one end by silicon rubber cork and connected at the other end thereof to a suction opening ofa vacuum pump by way ofa manometer. While maintaining the interior of the steel pipe A at a reduced pressure of 30 mm Hg, the pipe A was heated in an oven to l C for about 10 minutes (i.e.,
  • the resultant film was uniform free of pinholes and had a thickness of 210 a.
  • the film was highly smoothsurfaced.
  • EXAMPLE 4 The inner surfaces of the steel pipes having different inner diameters were electrostatically coated in the same manner as in Example I, with the results shown in Table 1 below, in which the surface conditions of the resultant film were inspected in the same manner as in Example 1.
  • Example 2 posited on pipes in the same manner as in Example 1 was heated and fused to form a continuous coating film by followin g the same procedure as in'Example 1 ex-- cept that the fusing of the deposited particles was conducted at varying reduced pressures. The results are given' in Table 2 below.
  • EXAMPLE 7 The electrostatic coating was conducted in the same manner as in Example 6, except that the flow rate of the air stream was 13 m/sec.
  • the resultant film of 380 p. was formed on the entire inner surface of the pipe and was uniform free of pinhole.
  • Example 6 For comparison electrostatic coating the same as in Example 6 was carried out at the flow rate of 0 m/sec and 18 m/sec. In the formercase dry powder was deposited only on the front part of the pipe with almost no deposition on the back part, failing to produce uniform film, and in the latter case almost no deposition of the'dry powder was observed.
  • Example 6 The inner surface of a steel pipe, 5.5 m in length and 35.7 mm in inner diameter was electrostatically coated in the same manner as in Example 6 withvarious dry coating compositions of a particle size of about to 200 p. shown in Table 5 below, in which the results are'- also shown.
  • a method for coating the inner surface of a metal pipe having an inner diameter of l-l5 cm with a dry coating composition which comprises the steps of:

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
US00342939A 1972-03-25 1973-03-20 Method for coating the inner surface of metal pipes Expired - Lifetime US3850660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47029911A JPS4896630A (US07122603-20061017-C00045.png) 1972-03-25 1972-03-25

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904930A (en) * 1974-04-17 1975-09-09 Estey Dynamics Corp Automatic powder spray apparatus and method for spraying the inside surfaces of containers
US3974306A (en) * 1972-10-06 1976-08-10 Kansai Paint Company, Ltd. Method for coating the inner surface of metal pipes
FR2402488A1 (fr) * 1977-09-09 1979-04-06 Continental Group Formation d'un revetement electrostatique de poudre a l'interieur d'une piece tubulaire, notamment corps de boite
US4170074A (en) * 1976-12-06 1979-10-09 Owens-Illinois, Inc. Powder dryer including fluidized bed aspirator
US4179883A (en) * 1976-10-21 1979-12-25 Nippon Oil Seal Industry Co., Ltd. Reed valve assembly
US4273798A (en) * 1978-07-12 1981-06-16 Metallgesellschaft Aktiengesellschaft Process for coating metal tubes with plastic materials
US4288466A (en) * 1978-07-12 1981-09-08 Owens-Illinois, Inc. Power preconditioning for electrostatic application
US4304179A (en) * 1978-12-15 1981-12-08 Fuji Photo Film Co., Ltd. Marking method and device
US4497837A (en) * 1977-01-14 1985-02-05 Kaiser Steel (Delaware), Inc. Method for electrostatic, epoxy coating of steel drum interiors and product thereof
US5029821A (en) * 1989-12-01 1991-07-09 The Carborundum Company Apparatus for controlling the magnesium content of molten aluminum
US5681623A (en) * 1995-01-27 1997-10-28 Technology Licensing Company Process for producing electrostatic clad conduit innerduct liner
US20020127332A1 (en) * 2001-03-06 2002-09-12 Nordson Corporation Method and apparatus for powder coating hollow objects
US20150024140A1 (en) * 2012-02-29 2015-01-22 Mitsubishi Heavy Industries, Ltd. Resin coating layer and life-extension method for piping
US9162245B1 (en) 2012-03-29 2015-10-20 BTD Wood Powder Coating, Inc. Powder coating conveyor support
US9950332B2 (en) 2015-04-15 2018-04-24 Joe C. McQueen Apparatus and method for rotating cylindrical members and coating internal surface of tubulars

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58220368A (ja) * 1982-06-15 1983-12-21 Toshiba Corp 燃料電池

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280240A (en) * 1938-09-23 1942-04-21 Bertram C Kathe Method and apparatus for impinging powdered material
US2869511A (en) * 1954-10-27 1959-01-20 Michigan Abrasive Company Apparatus for propelling particulate matter
US2880109A (en) * 1955-09-22 1959-03-31 United States Steel Corp Method of coating the interior of cylinders
US2974059A (en) * 1957-12-20 1961-03-07 Knapsack Ag Fluidized bed coating process
US2974060A (en) * 1958-07-18 1961-03-07 Polymer Corp Fluidized bed coating method
US3019126A (en) * 1959-03-24 1962-01-30 United States Steel Corp Method and apparatus for coating metal strip and wire
US3028251A (en) * 1956-11-20 1962-04-03 Polymer Corp Method of coating an article with a powdered resin composition and method of making the composition
US3074808A (en) * 1959-10-19 1963-01-22 Phillips Petroleum Co Method and apparatus for coating the interior of a pipe
US3186860A (en) * 1956-11-13 1965-06-01 Phillips Petroleum Co Process for coating surfaces
US3199491A (en) * 1961-03-24 1965-08-10 Degussa Apparatus for coating one surface of a strip by a fluid bed sintering procedure
US3207618A (en) * 1961-08-03 1965-09-21 Internat Protected Metals Inc Method and apparatus for applying protective coatings
US3394450A (en) * 1965-01-25 1968-07-30 Gen Cable Corp Method for cating the inside of continuously welded pipe
US3432326A (en) * 1956-05-28 1969-03-11 Dow Chemical Co Method for coating pipe
US3439649A (en) * 1965-03-15 1969-04-22 Ransburg Electro Coating Corp Electrostatic coating apparatus
US3468691A (en) * 1965-10-23 1969-09-23 Lipoma Electronics Co Method of and apparatus for the electrostatic application of solid particles to articles

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280240A (en) * 1938-09-23 1942-04-21 Bertram C Kathe Method and apparatus for impinging powdered material
US2869511A (en) * 1954-10-27 1959-01-20 Michigan Abrasive Company Apparatus for propelling particulate matter
US2880109A (en) * 1955-09-22 1959-03-31 United States Steel Corp Method of coating the interior of cylinders
US3432326A (en) * 1956-05-28 1969-03-11 Dow Chemical Co Method for coating pipe
US3186860A (en) * 1956-11-13 1965-06-01 Phillips Petroleum Co Process for coating surfaces
US3028251A (en) * 1956-11-20 1962-04-03 Polymer Corp Method of coating an article with a powdered resin composition and method of making the composition
US2974059A (en) * 1957-12-20 1961-03-07 Knapsack Ag Fluidized bed coating process
US2974060A (en) * 1958-07-18 1961-03-07 Polymer Corp Fluidized bed coating method
US3019126A (en) * 1959-03-24 1962-01-30 United States Steel Corp Method and apparatus for coating metal strip and wire
US3074808A (en) * 1959-10-19 1963-01-22 Phillips Petroleum Co Method and apparatus for coating the interior of a pipe
US3199491A (en) * 1961-03-24 1965-08-10 Degussa Apparatus for coating one surface of a strip by a fluid bed sintering procedure
US3207618A (en) * 1961-08-03 1965-09-21 Internat Protected Metals Inc Method and apparatus for applying protective coatings
US3394450A (en) * 1965-01-25 1968-07-30 Gen Cable Corp Method for cating the inside of continuously welded pipe
US3439649A (en) * 1965-03-15 1969-04-22 Ransburg Electro Coating Corp Electrostatic coating apparatus
US3468691A (en) * 1965-10-23 1969-09-23 Lipoma Electronics Co Method of and apparatus for the electrostatic application of solid particles to articles

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974306A (en) * 1972-10-06 1976-08-10 Kansai Paint Company, Ltd. Method for coating the inner surface of metal pipes
US3904930A (en) * 1974-04-17 1975-09-09 Estey Dynamics Corp Automatic powder spray apparatus and method for spraying the inside surfaces of containers
US4179883A (en) * 1976-10-21 1979-12-25 Nippon Oil Seal Industry Co., Ltd. Reed valve assembly
US4170074A (en) * 1976-12-06 1979-10-09 Owens-Illinois, Inc. Powder dryer including fluidized bed aspirator
US4497837A (en) * 1977-01-14 1985-02-05 Kaiser Steel (Delaware), Inc. Method for electrostatic, epoxy coating of steel drum interiors and product thereof
FR2402488A1 (fr) * 1977-09-09 1979-04-06 Continental Group Formation d'un revetement electrostatique de poudre a l'interieur d'une piece tubulaire, notamment corps de boite
US4158071A (en) * 1977-09-09 1979-06-12 The Continental Group, Inc. Method and apparatus for power coating of three-piece cans
US4273798A (en) * 1978-07-12 1981-06-16 Metallgesellschaft Aktiengesellschaft Process for coating metal tubes with plastic materials
US4288466A (en) * 1978-07-12 1981-09-08 Owens-Illinois, Inc. Power preconditioning for electrostatic application
US4304179A (en) * 1978-12-15 1981-12-08 Fuji Photo Film Co., Ltd. Marking method and device
US5029821A (en) * 1989-12-01 1991-07-09 The Carborundum Company Apparatus for controlling the magnesium content of molten aluminum
US5681623A (en) * 1995-01-27 1997-10-28 Technology Licensing Company Process for producing electrostatic clad conduit innerduct liner
US20020127332A1 (en) * 2001-03-06 2002-09-12 Nordson Corporation Method and apparatus for powder coating hollow objects
US6827780B2 (en) * 2001-03-06 2004-12-07 Nordson Corporation Method and apparatus for powder coating hollow objects
US20050037151A1 (en) * 2001-03-06 2005-02-17 Nordson Corporation Method and apparatus for powder coating hollow objects
US20150024140A1 (en) * 2012-02-29 2015-01-22 Mitsubishi Heavy Industries, Ltd. Resin coating layer and life-extension method for piping
US10139033B2 (en) * 2012-02-29 2018-11-27 Mitsubishi Heavy Industries, Ltd. Resin coating layer and life-extension method for piping
US9162245B1 (en) 2012-03-29 2015-10-20 BTD Wood Powder Coating, Inc. Powder coating conveyor support
US9950332B2 (en) 2015-04-15 2018-04-24 Joe C. McQueen Apparatus and method for rotating cylindrical members and coating internal surface of tubulars
US10543501B2 (en) 2015-04-15 2020-01-28 Joe C. McQueen Apparatus and method for rotating cylindrical members and coating internal surface of tubulars

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Publication number Publication date
JPS4896630A (US07122603-20061017-C00045.png) 1973-12-10

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