US4376024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of containers
Assignee: Rexam AB
•
Filing: 1980-12-23
•
Granted: 1983-03-08
•
Expires: 2000-12-23
Abstract
Abstract Ironing, drawing and/or other non chip-producing process is used to form a metal workpiece into an article which is then coated with a protective layer. The lubricating agents used in the non-chip-producing process are removed from the surfaces of the formed article in conjunction with the coating of the article with the protective layer. This is done by dissolving the lubricating agents in the liquid which is used in the application of the protective layer and which contains one or more bonding agents which form the protective layer after the treatment is complete. In one preferred embodiment, at least that protective layer which is closest to the material of the container is applied by electrolytic deposition.
Inventors
- 👤 Torsten Andersson
- 👤 Bengt Jeppsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:48
CPC Classifications
C; C25; C25D; C25D13/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A method for producing a metal article with a protective coating layer in which a workpiece is formed into the article by a non chip-producing operation with the use of lubricating agents, said method comprising placing the thus formed article after the forming operation in a liquid containing a bonding agent, dissolving said lubricating agents from the article into said liquid, and coating said bonding agents onto said article to form a protective coating layer thereon.
Claim 2
Independent Claim
76 words
A method for producing a metal article with a protective coating layer in which a workpiece is formed into the article by a non chip-producing operation with the use of lubricating agents, said method comprising placing the thus formed article after the forming operation in a liquid containing a bonding agent, dissolving said lubricating agents from the article into said liquid, and coating said bonding agents onto said article to form a protective coating layer thereon.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 wherein the forming of the article includes drawing the workpiece followed by ironing to produce a container.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 1 wherein the protective layer is coated on the article by electrolytically depositing the bonding agents from said liquid onto the article, said liquid constituting an electrolyte.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 1 wherein the lubricating agent is in the form of polyethylene-polypropylene dispersed in a mixture of monoethyl glycol ether and water.
Claim 6
Dependent Claim
37 words
A method as claimed in claim 4 wherein the composition of the lubricating agent is as follows, in percent by weight: ______________________________________
polyethylene-polypropylene
20 to 30
monoethyl glycol ether
30 to 40
water 30 to 50
______________________________________
Claim 7
Dependent Claim
93 words
A method as claimed in claim 4 or 5 wherein the liquid composition forms an electrolyte consisting essentially of water in which said lubricating agent is present in solution and in which ionized bonding agent is dispersed, and the bonding agent consisting essentially of, in percentby weight. ______________________________________
acrylic resin 0.1 to 9
polyester resin 0.1 to 9
plasticized melamine resin
0.1 to 4
monomer melamine resin
0.1 to 1
water soluble solvents
0.5 to 3
water-insoluble solvents
0.5 to 2
and
primary, secondary or tertiary
amines with a pH of 7.8-8.6
______________________________________
Claim 8
Dependent Claim
33 words
A method as claimed in claim 6 wherein for a white color for said protective layer, said electrolyte further contains titanium dioxide in an amount of between 4 and 5 percent by weight.
Claim 9
Dependent Claim
18 words
A method as claimed in claim 1 whereinsaid lubricating agents are water soluble and said liquid comprises water.
Claim 10
Dependent Claim
55 words
A method as claimed in claim 8 wherein said article is placed in the said liquid by immersing the article therein so that its corner and outer surfaces are brought into contact with the liquid to dissolve said lubricating agents and provide for the coating of the entire surface thereof with said protective coating layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |