GB2194466A - Method of cleaning a metallic surface - Google Patents

Method of cleaning a metallic surface Download PDF

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Publication number
GB2194466A
GB2194466A GB08716328A GB8716328A GB2194466A GB 2194466 A GB2194466 A GB 2194466A GB 08716328 A GB08716328 A GB 08716328A GB 8716328 A GB8716328 A GB 8716328A GB 2194466 A GB2194466 A GB 2194466A
Authority
GB
United Kingdom
Prior art keywords
cleaning
coating
keg
cleaned
mix
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.)
Withdrawn
Application number
GB08716328A
Other versions
GB8716328D0 (en
Inventor
Ralph Watson
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.)
Heineken UK Ltd
Original Assignee
Scottish and Newcastle Breweries PLC
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 Scottish and Newcastle Breweries PLC filed Critical Scottish and Newcastle Breweries PLC
Publication of GB8716328D0 publication Critical patent/GB8716328D0/en
Publication of GB2194466A publication Critical patent/GB2194466A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • B05D2202/15—Stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al

Abstract

There is described a method of cleaning a metallic surface which involves pre-treatment of the surface to reduce the surface to the base metal having a desired surface finish and applying a protective coating to the pre-treated surface. The method of protecting the cleaned surface is also described and comprises applying a synthetic resin coating to the surface of the container, the coating having a base of reactive acrylic polymer. Suitable cleaning methods include directing cleaning fluid at the metallic surface, eg a water and air mix containing abrasive material and etching wire acid. Inhibitors or detergents may be add to the water/air/abrasive mix. The protective coating may be applied to the surface by a spray gun which may utilise electrostatic attraction. Aluminium alloy or stainless steel beer kegs or barrels may be treated in this way.

Description

SPECIFICATION Method of cleaning a metallic surface This invention relates to a method of cleaning a metallic surface.
The invention has particular application to the cleaning of the outer surfaces of aluminium alloy or stainless steel beer kegs.
The brewing industry transports and stores much of the beer it produces in metal containers, notably in aluminium alloy or stainless steel beer kegs.
Beer kegs may be used satisfactorily for many years without requiring replacement or repair. However, through use and handling kegs become soiled and of unacceptable appearance. Also, the continual application and removal of glued identification labels from the kegs leads to a build up of glue on parts of the keg, the glue being baked onto the keg surface by the heat necessary for internal sterilisation of the keg and the gradual oxidation of the metal surface also detracts from the appearance of the keg.
Cleaning methods, such as dry sand blasting, have been used but tend to leave a residue of salts on the cleaned metal surface which increases the rate of surface metal oxidation after cleaning.
It is an object of this invention to provide a more effective method of cleaning such containers.
According to the present invention there is provided a method of cleaning a metallic surface comprising pre-treatment of the surface to reduce the surface to the base metal having a desired surface finish, and applying a protective coating to the pre-treated surface.
The pre-treatment of the surface may comprise directing cleaning fluid at the surface.
Preferably, the cleaning fluid is in the form of a water and air mix carrying an abrasive material.
Alternatively, the cleaning fluid may be an etching acid.
The desired surface finish may have a peak to trough depth of one thousandth of an inch.
The protective coating may be in the form of a synthetic resin and may be applied to the surface by means of a spray gun or by a spray gun utilising electro-static attraction.
When the cleaning fluid is in the form of a water/air/abrasive mix, inhibitors or detergents may be added to the mix, which is preferably blasted through a single nozzle.
The cleaning method is especially suited for use in the cleaning of aluminium alloy or stainless steel beer kegs or barrels.
According to a further aspect of the present invention there is provided a method of protecting the cleaned surface of a metallic container comprising applying a synthetic resin coating to the surface of the container, the coating having a base of reactive acrylic polymer.
Preferably, the polymer is prepared in two parts, the first part being an acrylic polymer and the second part being a polyisocyanate adduct containing unsaturated hydrocarbon and ketone with added toluene.
Preferably, the polyisocyanate adduct contains methylene and ethylene.
Embodiments of the present invention will now be described, by way of example.
A method of cleaning a metallic surface, such as the outer surface of an aluminium alloy or stainless steel beer keg, comprises wet blasting the surface of the keg such that the surface is reduced to the base metal and applying a protective coating to the cleaned surface.
The wet blasting is achieved by blasting a water/air/fine sand mix through a single nozzle. Inhibitors and detergents are added to the mix. The mix removes labels, label glue, oxides, paint and dirt and renders the surface with a peak to trough depth of one thousandth of an inch. The mix is also capable of scouring out corrosion and surface salts which may have been left on the surface from previous dry blasting. The wet blasting cleans the surface without removing metal and does not produce dust, obviating the need for air fed helmets and other cumbersome protective clothing.
The protective coating is applied to the cleaned keg by means of a spray gun and electro-static attraction may be utilised. The coating is a clear synthetic resin, having a base of reactive acrylic polymer.
The resin may be a single pack product comprising polyisocyanate pre-polymer and, if required, auxiliary stabilisers. A typical resin of this type comprises 98-100 per cent, by weight, of pre-polymer and 0.1-2 per cent of stabilisers.
Alternatively, the resin may be a two pack product, the first pack comprising hydroxylated polymer, such as polyacrylic polyester, and the second pack comprising a polyisocyanate adduct containing methylene, ethylene and ketone with toluene added. Typically, the first pack represents 60-75 per cent of the total weight of the product.
The coating helps to prevent soil build up on the newly cleaned keg and reduces the rate of oxidation of newly cleaned aluminium alloy kegs. The coating is also quick drying and curing, reducing operation times, and is capable of withstanding the abrasion and heating which a keg is subject to in use.
Modifications and improvements may be made without departing from the scope of the invention, for example, the surface may be cleaned by acid etching rather than by wet biasting.
1. A method of cleaning a metallic surface
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of cleaning a metallic surface This invention relates to a method of cleaning a metallic surface. The invention has particular application to the cleaning of the outer surfaces of aluminium alloy or stainless steel beer kegs. The brewing industry transports and stores much of the beer it produces in metal containers, notably in aluminium alloy or stainless steel beer kegs. Beer kegs may be used satisfactorily for many years without requiring replacement or repair. However, through use and handling kegs become soiled and of unacceptable appearance. Also, the continual application and removal of glued identification labels from the kegs leads to a build up of glue on parts of the keg, the glue being baked onto the keg surface by the heat necessary for internal sterilisation of the keg and the gradual oxidation of the metal surface also detracts from the appearance of the keg. Cleaning methods, such as dry sand blasting, have been used but tend to leave a residue of salts on the cleaned metal surface which increases the rate of surface metal oxidation after cleaning. It is an object of this invention to provide a more effective method of cleaning such containers. According to the present invention there is provided a method of cleaning a metallic surface comprising pre-treatment of the surface to reduce the surface to the base metal having a desired surface finish, and applying a protective coating to the pre-treated surface. The pre-treatment of the surface may comprise directing cleaning fluid at the surface. Preferably, the cleaning fluid is in the form of a water and air mix carrying an abrasive material. Alternatively, the cleaning fluid may be an etching acid. The desired surface finish may have a peak to trough depth of one thousandth of an inch. The protective coating may be in the form of a synthetic resin and may be applied to the surface by means of a spray gun or by a spray gun utilising electro-static attraction. When the cleaning fluid is in the form of a water/air/abrasive mix, inhibitors or detergents may be added to the mix, which is preferably blasted through a single nozzle. The cleaning method is especially suited for use in the cleaning of aluminium alloy or stainless steel beer kegs or barrels. According to a further aspect of the present invention there is provided a method of protecting the cleaned surface of a metallic container comprising applying a synthetic resin coating to the surface of the container, the coating having a base of reactive acrylic polymer. Preferably, the polymer is prepared in two parts, the first part being an acrylic polymer and the second part being a polyisocyanate adduct containing unsaturated hydrocarbon and ketone with added toluene. Preferably, the polyisocyanate adduct contains methylene and ethylene. Embodiments of the present invention will now be described, by way of example. A method of cleaning a metallic surface, such as the outer surface of an aluminium alloy or stainless steel beer keg, comprises wet blasting the surface of the keg such that the surface is reduced to the base metal and applying a protective coating to the cleaned surface. The wet blasting is achieved by blasting a water/air/fine sand mix through a single nozzle. Inhibitors and detergents are added to the mix. The mix removes labels, label glue, oxides, paint and dirt and renders the surface with a peak to trough depth of one thousandth of an inch. The mix is also capable of scouring out corrosion and surface salts which may have been left on the surface from previous dry blasting. The wet blasting cleans the surface without removing metal and does not produce dust, obviating the need for air fed helmets and other cumbersome protective clothing. The protective coating is applied to the cleaned keg by means of a spray gun and electro-static attraction may be utilised. The coating is a clear synthetic resin, having a base of reactive acrylic polymer. The resin may be a single pack product comprising polyisocyanate pre-polymer and, if required, auxiliary stabilisers. A typical resin of this type comprises 98-100 per cent, by weight, of pre-polymer and 0.1-2 per cent of stabilisers. Alternatively, the resin may be a two pack product, the first pack comprising hydroxylated polymer, such as polyacrylic polyester, and the second pack comprising a polyisocyanate adduct containing methylene, ethylene and ketone with toluene added. Typically, the first pack represents 60-75 per cent of the total weight of the product. The coating helps to prevent soil build up on the newly cleaned keg and reduces the rate of oxidation of newly cleaned aluminium alloy kegs. The coating is also quick drying and curing, reducing operation times, and is capable of withstanding the abrasion and heating which a keg is subject to in use. Modifications and improvements may be made without departing from the scope of the invention, for example, the surface may be cleaned by acid etching rather than by wet biasting. CLAIMS
1. A method of cleaning a metallic surface comprising pre-treatment of the surface to reduce the surface to the base metal having a desired surface finish, and applying a protective coating to the pre-treated surface.
2. A method as claimed in Claim 1, wherein the pre-treatment of the surface comprises directing cleaning fluid at the surface.
3. A method as claimed in Claim 2, wherein the cleaning fluid is in the form of a water and air mix carrying an abrasive material.
4. A method as claimed in Claim 2, wherein the cleaning fluid is an etching acid.
5. A method as claimed in any preceding claim, wherein the desired surface finish has a peak to trough depth of between one half and one and one half thousandth of an inch.
6. A method as claimed in any preceding claim, wherein the protective coating is in the form of a synthetic resin and may be applied to the surface by means of a spray gun or by a spray gun utilising electro-static attraction.
7. A method as claimed in Claim 2, wherein inhibitors or detergents areadded to the mix, which is blasted through a single nozzle.
8. A method of protecting the cleaned surface of a metallic container comprising applying a synthetic resin coating to the surface of the container, the coating having a base of reactive acrylic polymer.
9. A method as claimed in Claim 8, wherein the polymer is prepared in two parts, the first part being an acrylic polymer and the second part being a polyisocyanate adduct containing unsaturated hydrocarbon and ketone with added toluene.
10. A method as claimed in Claim 9, wherein the polyisocyanate adduct contains methylene and ethylene.
11. A method as claimed in any preceding claim applied to the cleaning of aluminium alloy or stainless steel beer kegs or barrels.
12. A method of cleaning a metalic surface substantially as hereinbefore described.
13. A method of protecting the cleaned surface of a metallic container substantially as hereinbefore described.
GB08716328A 1986-07-10 1987-07-10 Method of cleaning a metallic surface Withdrawn GB2194466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB868616877A GB8616877D0 (en) 1986-07-10 1986-07-10 Cleaning metallic surface

Publications (2)

Publication Number Publication Date
GB8716328D0 GB8716328D0 (en) 1987-08-19
GB2194466A true GB2194466A (en) 1988-03-09

Family

ID=10600858

Family Applications (2)

Application Number Title Priority Date Filing Date
GB868616877A Pending GB8616877D0 (en) 1986-07-10 1986-07-10 Cleaning metallic surface
GB08716328A Withdrawn GB2194466A (en) 1986-07-10 1987-07-10 Method of cleaning a metallic surface

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB868616877A Pending GB8616877D0 (en) 1986-07-10 1986-07-10 Cleaning metallic surface

Country Status (1)

Country Link
GB (2) GB8616877D0 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1006207A (en) * 1963-10-09 1965-09-29 Reynolds Metals Co Improvements in the treatment of aluminium and aluminium base alloy surfaces
GB1108346A (en) * 1964-05-26 1968-04-03 Rheinische Blattmetall Ag A method of improving the adhesion of substances to metal surfaces
GB1201312A (en) * 1966-06-03 1970-08-05 Coussinets Ste Indle Improvements in and relating to the electrolytic surface treatment of metals
GB1322381A (en) * 1970-01-02 1973-07-04 British Aluminium Co Ltd Protective coated aluminium and a process for the application of a protective coating to aluminium
US3997694A (en) * 1973-12-12 1976-12-14 E. I. Du Pont De Nemours And Company Container coated with a ductile coating of an acrylic polymer having reactive sites and an epoxy resin
GB2083377A (en) * 1980-07-30 1982-03-24 Energy The Secretary Of State Formation of metal/resin bonds
US4380560A (en) * 1981-12-17 1983-04-19 Occidental Chemical Corporation Process for treatment of black plate containers
GB2152065A (en) * 1983-12-21 1985-07-31 Inmont Corp Water dilutable acrylated epoxy-phenolic coating compositions

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1006207A (en) * 1963-10-09 1965-09-29 Reynolds Metals Co Improvements in the treatment of aluminium and aluminium base alloy surfaces
GB1108346A (en) * 1964-05-26 1968-04-03 Rheinische Blattmetall Ag A method of improving the adhesion of substances to metal surfaces
GB1201312A (en) * 1966-06-03 1970-08-05 Coussinets Ste Indle Improvements in and relating to the electrolytic surface treatment of metals
GB1322381A (en) * 1970-01-02 1973-07-04 British Aluminium Co Ltd Protective coated aluminium and a process for the application of a protective coating to aluminium
US3997694A (en) * 1973-12-12 1976-12-14 E. I. Du Pont De Nemours And Company Container coated with a ductile coating of an acrylic polymer having reactive sites and an epoxy resin
GB2083377A (en) * 1980-07-30 1982-03-24 Energy The Secretary Of State Formation of metal/resin bonds
US4380560A (en) * 1981-12-17 1983-04-19 Occidental Chemical Corporation Process for treatment of black plate containers
GB2152065A (en) * 1983-12-21 1985-07-31 Inmont Corp Water dilutable acrylated epoxy-phenolic coating compositions

Also Published As

Publication number Publication date
GB8716328D0 (en) 1987-08-19
GB8616877D0 (en) 1986-08-20

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)