GB1558464A - Method and apparatus for providing flame cured coatings - Google Patents
Method and apparatus for providing flame cured coatings Download PDFInfo
- Publication number
- GB1558464A GB1558464A GB3178275A GB3178275A GB1558464A GB 1558464 A GB1558464 A GB 1558464A GB 3178275 A GB3178275 A GB 3178275A GB 3178275 A GB3178275 A GB 3178275A GB 1558464 A GB1558464 A GB 1558464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- flame
- container body
- coatings
- mandrel
- 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
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
- 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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
-
- 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
- B05D3/08—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 flames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
- B41M1/28—Printing on other surfaces than ordinary paper on metals
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
Description
(54) METHOD AND APPARATUS FOR PROVIDING FLAME CURED COATINGS
(71) We, METAL Box LIMITED, of
Queens House, Forbury Road, Reading RG1 3JH, Berkshire, a British Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to the coating of container bodies using two or more coatings at least the first applied of said coatings is of a cross-linkage material in a solvent.
Containers are known, which are made by drawing sheet metal into thin-walled/cylindrical shapes having one end closed. Such containers are passed through dies which reduce the wall thickness by ironing and in so doing subject the container wall to stresses which could disrupt any surface coatings thereon. It is therefore customary to coat such containers after forming. The coating may be in the form of a base coating and subsequent printed coatings. It is customary to stove each coating in an oven to cure each coat completely before the application of the next coating.
In this specification the word "cured" is used in relation to a cross-linkable coating and deemed to indicate that no further cross linking of the coating material is possible; "partially cured" therefore means that further cross linking of the coating material is possible. The word "dried" is used in relation to a coating having solvents and indicates that the solvents have been driven off.
In a first aspect this invention provides method of coating a container body with at least two successive coatings, said method comprising the steps of applying a first coating of an organic coating material to a container body; passing the coated container body rapidly before at least one flame source to only partially cure the first coating but sufficiently to permit application of a second coating; applying a second coating of organic coating material to the only partially cured first coating; and thereafter fully curing the two coatings.
In a preferred embodiment of the method the first coating is of a base coating material and the second coating is of a printihg ink.
Tn a second aspect this invention provides apparatus for coating a container body, said apparatus comprising a first coating means for applying a first coating to a container body; a flame source, support means for exposing said container body having a first coating thereon to the flame with the flame directly impinging on the coating to partially cure the first coating; second coating means for applying a second coating to the first coating while it is only partially cured; and means for fully curing the first and second coatings simultaneously.
The support means may effect the container movement mechanically, pneumatically or electrically, along a linear or a curved path.
Various embodiments will now be described, by way of example, and with reference to the accompanying drawings in which: Fig. 1 is a block diagram illustrating a prior art method of coating;
Fig. 2 similarly illustrates one embodiment of the invention;
Fig. 3A is a side elevation of a first apparatus arranged for putting the method of Fig. 2 into effect and in which a container being coated is conveyed along a linear path;
Fig. 3B is an end elevation of the apparatus, taken on line A-A1 in Fig. 3A;
Fig. 4A is a side elevation of a second apparatus in accordance with the invention, in which the container being coated is conveyed along a linear path;
Fig. 4B is an end elevation of the apparatus of Fig. 4A, taken on the line B-B1 of that
Figure;
Fig. 5A is a side elevation of a third apparatus in accordance with the invention, in which the container being coated is conveyed along a curved path; and
Fig. 5B is a front elevation of the apparatus of Fig. 5A, taken on line C-C1 of that Figure.
Referring to Fig. 1, during the conventional manufacture of wall ironed cans the cans are first coated with a base coating material and then passed to an oven where the coating is cured. A second coating is then applied on top of the base coating whereafter the cans are passed to a second oven for curing of the second coating before any subsequent coatings are applied or additional operations performed as desired.
Typical gas fired ovens for such known stoving operations comprise a thermally insulated tunnel oblong in cross section. A chain having horizontal pegs, one for each can passes through the oven. Such ovens have a large volume and require considerable amounts of energy to heat them. A typical stoving cycle for can coatings or print would include a period of 2 minutes at 2050C, and time for raising and lowering the temperature of the can to make a total time in the oven of up to 6 minutes, dependent upon line speed. Such extended stoving results in fully cured coatings which are completely crosslinked.
Applicants have discovered that coating need only be dried or partially cured before the application of a further coating thereon.
In the method shown diagrammatically in
Fig. 2 a first coating is applied to a can and then dried or cured to produce a surface stable enough to permit the application of a second coating. The drying or curing of the first coating may be induced by heat from a gas flame. The second coating may be dried or cured in readiness to receive further coatings (as shown by the continuous line) or alternatively the combination of first and second coatings may be stoved to completely dry or cure both coatings, (as indicated by the dashed line).
Suitable conditions for achieving the desired degree of drying or curing depend on the characteristics of the coating materials used (e.g. base coatings, printing inks, or varnishes or lacquers). However, it has been found that by using the method of Fig. 2 the drying or curing time required can be reduced to the order of seconds from the minutes required in the prior art method. Preferred coating materials will require less than 10 seconds.
The temperature of the flam= used to bring about the desired degree of drying or partial curing is high and in order to prevent scorching or ignition of the coatings, the coated surfaces of the cans are passed rapidly before the flame.
Ideally, it is only necessary to heat the coating and not the can so less heat should be necessary than in prior art methods where the whole can is heated.
EXPERIMENTAL EXAMPLE.
The principle of the invention can be demonstrated by means of a simple apparatus (not shown) in which a rotatable mandrel or fixed peg adapted to receive a container is used to present the container before a gas burner.
A can having a wet base coating (for example an acrylic coating No. W758 sold in the
United Kingdom by Ault and Wiborg Ltd.) was placed on the mandrel and rotated at a high speed, e.g. 900 revolutions per minute.
Flames from the burner bar were brought to impinge upon the surface of the base coating for a period of 1.3 seconds to dry or partially cure the coating. The coating so produced was capable of receiving a subsequent coating of printed ink (such as a red printing ink No.
GP 25 sold in the United Kingdom by Edward
Marsden Ltd).
Figs. 3A, 3B, 4A, 4B, 5A and 5B show apparatus to illustrate, by way of non-limiting examples, ways in ehich the coatings on a can body may be presented to a flame.
Referring to Figs. 3A it will be seen that the apparatus has can carrying mandrels (such as that denoted at 1) which are each carried on the arm 2 of a chain link 3. Linear movements of the chain 4 moves the mandrels along and above a burner 5. Guides 6, best seen in Fig.
3B, are provided to control the spacing of the mandrels above the burner bar. Each mandrel 1 is rotated about its axis which is substantially parallel with the burner bar 5. Rotation is derived from a stationary rack 7 and pinions such as 8, which are attached'to a shaft 9 on each of the arms 2. Suitable bevelled gears attached to the shaft 9 are used to rotate each mandrel 1. The temperature to which the coating is raised is governed by the characteristics of the flames from the burner 5 and the time of impingement. The time of impingement is controllee either by the rate of linear passage of the mandrels over the burner or the length of the burner, or combination of these parameters.
Referring to Figs. 4A, 4B, a can body 10 is shown carried by an air conveyor 12. Such conveyors are known in which the cans are carried by air issuing from an elongate orifice 11 above a plenum chamber of the conveyor 12. By suitable adaption of the conveyor it is possible to not only convey each can along the conveyor but also rotate it before impinging upon it flames from a burner 5, thereby providing the conditions for the required degree of drying or partial curing according to the invention as already described. Hot air may be used to not only convey the cans but also assist in partially curing the coating. The degree of curing is controlled by controlling the temperature of the flame, hot air and the time the coating is exposed to the heat.
Referring to Fig. 5A, a rotary apparatus is shown in which a plurality of mandrels, such as the two denoted 14 and depicted, are rotatably mounted on a rotating hub 15 which is mounted on a shaft 16, driven by known means. As the hub rotates, as shown in Fig.
5B, each mandrel passes a feed position F at which a coated can body is fed onto it. As rotation of the hub 15 continues each can is therefore carried to pass, while rotating on its axis before a burner having a plurality of bars 5. In Fig. 5B the burner has a main supply pipe 17 through which gas is fed to the burner bars such as those denoted at 5. It is thought that there may be some advantage in the cyclic heating and cooling applied to the cooling applied to the coating on a can as it passes from bar to bar. As described previously the parameters of temperature and time of exposure are controlled to achieve partial curing.
After heating to effect the desired degree of drying or partial cure of the coating, the can body may optionally be carried through a cooling location in which cold air is directed onto the surface of the can body from a nozzle 18.
Thereafter each can is removed from the mandrel and ejected from the machine at a position E, and one or more further coatings are applied and dried or completely cured as described in relation to the method of Fig. 2.
In Fig. 5A, each mandrel 14 is carried by a shaft 29 mounted on the hub 15 and carrying a pinion 28 which coacts with a gear wheel 19 fixed to the machine frame 20, so that as the hub 15 rotates, each mandrel is rotated continuously, so permitting the entire surface coating of each can carried thereon to be presented, by rotation, to the burners. A flue 21 is provided to conduct the fumes, if any, away from the machine.
The coating materials used may be known materials or alternatively may be modified by the addition of a high level of lubricant incorporated to produce a high degree of slip in the coating which aids subsequent conveying of the cans.
When base coatings having high levels of lubricant are stoved in the manner of the prior art, the lubricant residing on the surface after the relatively low temperature curing interferes with the deposition of further coatings.
However, if the methods shown in Fig. 2 is used any residual lubricant in or near the surface of the base coating is driven off so leaving the surface receptive to a second coating of, for instance, a printing ink. The subsequent final stoving of the combined coating reblooms the surface to a lustrous quality and satisfactory slip.
While the invention has been described in terms of rotating mandrels to carry the coated article, where rotation is not essential, a known peg chain may be used to carry the article before the flame.
WHAT WE CLAIM IS:- 1. A method of coating a container body with at least two successive coatings, said method comprising the steps of applying a first coating of an organic coating material to a container body; passing the coated container body rapidly before at least one flame source to only partially cure the first coating but sufficiently to permit application of a second coating; applying a second coating of organic coating material to the only partially cured first coating; and thereafter fully curing the two coatings.
2. A method according to claim 1 wherein the first coating is presented to the gas flame for a period of time in the order of seconds as opposed to minutes.
3. A method according to claim 2 wherein the flame impinges simultaneously on the first coating for a period of time of less than 10.0 seconds.
4. A method according to any preceding claim wherein the container body is rotated to present the entire container body to a flame on a fixed burner.
5. A method according to any preceding claim wherein the first coating includes a lubricant, at least part of which is removed from the surface of the first coating by the flame, and the second coating also has a lubricant.
6. A method according to claim 1 wherein the first coating is a base coating and the second coating is a printing ink.
7. A method according to any preceding claim wherein the first and second coatings are fully cured after the application of the second coating and thereafter a further coating is applied.
8. Apparatus for coating acontainerbody, said apparatus comprising a first coating means for applying a first coating to a container body; a flame source, support means for exposing said container body having a first coating thereon to the flame with the flame directly impinging on the coating to partially cure the first coating; second coating means for applying a second coating to the first coating while it is only partially cured; and means for fully curing the first and second coatings simultaneously.
9. Apparatus according to claim 8 wherein the support means includes a rotatable mandrel and drive means for rotating said mandrel.
10. Apparatus according to claim 9 wherein the mandrel is carried on a chain link and said drive means includes a pinion, attached to a shaft in the link and which pinion coacts with a stationary rack.
11. Apparatus according to claim 8 wherein said flame source includes a plurality of burner bars disposed in adjacent relation, and said support means includes a hub mounted for rotation and carrying at least one shaft for movement past said burner bars, a mandrel rotatably mounted on said shaft, and means for effecting rotation of said mandrel.
12. Apparatus according to claim 11 wherein said burner bars are spaced apart.
13. Apparatus according to claim 8 wherein the support means is an air conveyor and includes a burner bar extending alongside the conveyor to direct flames therefrom onto the container body.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (19)
1. A method of coating a container body with at least two successive coatings, said method comprising the steps of applying a first coating of an organic coating material to a container body; passing the coated container body rapidly before at least one flame source to only partially cure the first coating but sufficiently to permit application of a second coating; applying a second coating of organic coating material to the only partially cured first coating; and thereafter fully curing the two coatings.
2. A method according to claim 1 wherein the first coating is presented to the gas flame for a period of time in the order of seconds as opposed to minutes.
3. A method according to claim 2 wherein the flame impinges simultaneously on the first coating for a period of time of less than 10.0 seconds.
4. A method according to any preceding claim wherein the container body is rotated to present the entire container body to a flame on a fixed burner.
5. A method according to any preceding claim wherein the first coating includes a lubricant, at least part of which is removed from the surface of the first coating by the flame, and the second coating also has a lubricant.
6. A method according to claim 1 wherein the first coating is a base coating and the second coating is a printing ink.
7. A method according to any preceding claim wherein the first and second coatings are fully cured after the application of the second coating and thereafter a further coating is applied.
8. Apparatus for coating acontainerbody, said apparatus comprising a first coating means for applying a first coating to a container body; a flame source, support means for exposing said container body having a first coating thereon to the flame with the flame directly impinging on the coating to partially cure the first coating; second coating means for applying a second coating to the first coating while it is only partially cured; and means for fully curing the first and second coatings simultaneously.
9. Apparatus according to claim 8 wherein the support means includes a rotatable mandrel and drive means for rotating said mandrel.
10. Apparatus according to claim 9 wherein the mandrel is carried on a chain link and said drive means includes a pinion, attached to a shaft in the link and which pinion coacts with a stationary rack.
11. Apparatus according to claim 8 wherein said flame source includes a plurality of burner bars disposed in adjacent relation, and said support means includes a hub mounted for rotation and carrying at least one shaft for movement past said burner bars, a mandrel rotatably mounted on said shaft, and means for effecting rotation of said mandrel.
12. Apparatus according to claim 11 wherein said burner bars are spaced apart.
13. Apparatus according to claim 8 wherein the support means is an air conveyor and includes a burner bar extending alongside the conveyor to direct flames therefrom onto the container body.
14. Apparatus according to claim 8
wherein the support means is a peg mounted on a chain.
15. A container body coated by the method according to any of claims 1 to 7.
16. A method substantially as herein before described with reference to Fig. 2 of the accompanying drawings.
17. Apparatus substantially as herein before described with reference to Figs. 3A and 3B of the accompanying drawings.
18. Apparatus substantially as herein before described with reference to Figs. 4A and 4B of the accompanying drawings.
19. Apparatus substantially as herein before described with reference to Figs. 5A and 5B of the accompanying drawings.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3178275A GB1558464A (en) | 1975-07-29 | 1975-07-29 | Method and apparatus for providing flame cured coatings |
CA256,396A CA1103107A (en) | 1975-07-29 | 1976-07-06 | Coating of articles |
JP8829576A JPS5217532A (en) | 1975-07-29 | 1976-07-26 | Method of coating container body with coating of two layers or more |
US06/424,711 US4730575A (en) | 1975-07-29 | 1982-09-27 | Coating of articles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3178275A GB1558464A (en) | 1975-07-29 | 1975-07-29 | Method and apparatus for providing flame cured coatings |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1558464A true GB1558464A (en) | 1980-01-03 |
Family
ID=10328338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3178275A Expired GB1558464A (en) | 1975-07-29 | 1975-07-29 | Method and apparatus for providing flame cured coatings |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPS5217532A (en) |
CA (1) | CA1103107A (en) |
GB (1) | GB1558464A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1985001678A1 (en) * | 1983-10-12 | 1985-04-25 | Basf Farben + Fasern Aktiengesellschaft | Process for producing two- or multi-colour lacquer and plant for carrying out such process |
EP0167923A2 (en) * | 1984-07-11 | 1986-01-15 | Schmalbach-Lubeca AG | Process for applying a decoration and an anticorrosive lacquer to metallic can bodies |
EP0201268A2 (en) * | 1985-05-03 | 1986-11-12 | Cooper Coated Coil Limited | Process for producing pre-coated metal sheet |
WO1997005965A1 (en) * | 1995-08-07 | 1997-02-20 | Mida S.R.L. | Method for coating and decorating surfaces in general |
EP0818248A1 (en) * | 1996-06-12 | 1998-01-14 | Esterina Vergani | Method and device for painting metal plates and sections |
WO1998036852A1 (en) * | 1997-02-22 | 1998-08-27 | The Aerogen Company Limited | Curing of coatings |
GB2369790A (en) * | 2000-12-08 | 2002-06-12 | Northpoint Ltd | Method of protecting a surface |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5349587A (en) * | 1976-10-15 | 1978-05-06 | Toyo Ink Mfg Co | Method of correcting bonded portion of can drum |
-
1975
- 1975-07-29 GB GB3178275A patent/GB1558464A/en not_active Expired
-
1976
- 1976-07-06 CA CA256,396A patent/CA1103107A/en not_active Expired
- 1976-07-26 JP JP8829576A patent/JPS5217532A/en active Granted
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1985001678A1 (en) * | 1983-10-12 | 1985-04-25 | Basf Farben + Fasern Aktiengesellschaft | Process for producing two- or multi-colour lacquer and plant for carrying out such process |
EP0139274A1 (en) * | 1983-10-12 | 1985-05-02 | Audi Ag | Method and apparatus for producing a two- or multicoloured coat of lacquer |
EP0167923A2 (en) * | 1984-07-11 | 1986-01-15 | Schmalbach-Lubeca AG | Process for applying a decoration and an anticorrosive lacquer to metallic can bodies |
EP0167923A3 (en) * | 1984-07-11 | 1986-09-03 | Schmalbach-Lubeca Ag | Process for applying a decoration and an anticorrosive lacquer to metallic can bodies |
US4693801A (en) * | 1984-07-11 | 1987-09-15 | Schmalbach-Lubeca Ag | Method of decorating and inhibiting corrosion of metallic articles |
EP0201268A2 (en) * | 1985-05-03 | 1986-11-12 | Cooper Coated Coil Limited | Process for producing pre-coated metal sheet |
EP0201268A3 (en) * | 1985-05-03 | 1987-07-01 | Cooper Coated Coil Limited | Process for producing pre-coated metal sheet |
WO1997005965A1 (en) * | 1995-08-07 | 1997-02-20 | Mida S.R.L. | Method for coating and decorating surfaces in general |
EP0843598A1 (en) | 1995-08-07 | 1998-05-27 | Mida S.R.L. | Method for coating and decorating surfaces in general |
EP0818248A1 (en) * | 1996-06-12 | 1998-01-14 | Esterina Vergani | Method and device for painting metal plates and sections |
WO1998036852A1 (en) * | 1997-02-22 | 1998-08-27 | The Aerogen Company Limited | Curing of coatings |
GB2369790A (en) * | 2000-12-08 | 2002-06-12 | Northpoint Ltd | Method of protecting a surface |
Also Published As
Publication number | Publication date |
---|---|
CA1103107A (en) | 1981-06-16 |
JPS5217532A (en) | 1977-02-09 |
JPS6111674B2 (en) | 1986-04-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |