US3716906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making food containers
Assignee: RHEEM PACIFIC PACKAGING CORP
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Filing: 1970-04-06
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Granted: 1973-02-20
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Expires: 1990-04-06
Abstract
Abstract A method of making tin lines drums and other large containers adapted for use in storing and shipping food products. The method is particularly concerned with making the shell or body tube for such container, and utilizes as the starting material a flat metal sheet plated along at least one side with a layer of tin. The plated sheet is formed into a tube having overlapped longitudinal edges which are then seam welded to each other from end to end thereof. Finally, the welded seam and surface portions bordering the same along the interior of the shell are sprayed with molten tin which is reflowed after impact with the shell because the temperature thereof along the sprayed band is maintained at a value above the melting temperature of the tin by utilizing for this purpose a component of the residual heat from the seam welding process.
Inventors
- 👤 T Troughton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:58
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26; B21D51/2676; B23; B23K; B23K1/00; B23K1/14; B23K1/16; B65; B65D; B65D7/00; B65D7/12; B65D7/34; B65D7/38; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
185 words
In a method of making a body tube for a relatively large metal container adapted to receive and store food products and the like therein from a metal sheet plated along one side thereof with a coating of tin, the steps after formation of such a sheet into a tubular configuration with the longitudinal edge portions thereof overlapping and elevating the temperature of such edge portions to a value exceeding the melting temperature of tin and sufficient to weld the edge portions and thereby constrain the sheet in tubular form with the tin coating thereon oriented along the inner surface thereof, and, within the time interval subsequent to said temperature elevation and prior to substantial temperature reduction thereafter by dissipation of the heat attributable thereto, depositing molten tin onto the inner surface of said tube along a longitudinally extending band having a transverse width embodying said weld and corresponding generally to the width of the area elevated at least in part to the reflow temperature of the molten tin by the welding heat dissipating transversely through said tube from the site of the weld therealong.
Claim 2
Dependent Claim
185 words
In a method of making a body tube for a relatively large metal container adapted to receive and store food products and the like therein from a metal sheet plated along one side thereof with a coating of tin, the steps after formation of such a sheet into a tubular configuration with the longitudinal edge portions thereof overlapping and elevating the temperature of such edge portions to a value exceeding the melting temperature of tin and sufficient to weld the edge portions and thereby constrain the sheet in tubular form with the tin coating thereon oriented along the inner surface thereof, and, within the time interval subsequent to said temperature elevation and prior to substantial temperature reduction thereafter by dissipation of the heat attributable thereto, depositing molten tin onto the inner surface of said tube along a longitudinally extending band having a transverse width embodying said weld and corresponding generally to the width of the area elevated at least in part to the reflow temperature of the molten tin by the welding heat dissipating transversely through said tube from the site of the weld therealong.
Claim 3
Dependent Claim
184 words
In a method of making the body tube for a relatively large metal container adapted to receive and store food products and the like therein from a metal sheet plated along one side thereof with a coating of tin, the steps after formation of such a sheet into a tubular configuration with the longitudinal edge portions thereof overlapping and elevating the temperature of such edge portions to a value sufficient to weld the same and thereby constrain the sheet in tubular form with the tin coating thereon oriented along in inner surface thereof, heating tin to the melting temperature thereof, and, within the time interval subsequent to said temperature elevation and prior to substantial temperature reduction thereafter by dissipation of the heat attributable thereto, spraying the molten tin onto the inner surface of said tube along a longitudinally extending band having a transverse width embodying said weld and corresponding generally to the width of the area elevated at least in part to the reflow temperature of the tin by the welding heat dissipating transversely through said tube from the site of the weld therealong.
Claim 4
Dependent Claim
184 words
In a method of making the body tube for a relatively large metal container adapted to receive and store food products and the like therein from a metal sheet plated along one side thereof with a coating of tin, the steps after formation of such a sheet into a tubular configuration with the longitudinal edge portions thereof overlapping and elevating the temperature of such edge portions to a value sufficient to weld the same and thereby constrain the sheet in tubular form with the tin coating thereon oriented along in inner surface thereof, heating tin to the melting temperature thereof, and, within the time interval subsequent to said temperature elevation and prior to substantial temperature reduction thereafter by dissipation of the heat attributable thereto, spraying the molten tin onto the inner surface of said tube along a longitudinally extending band having a transverse width embodying said weld and corresponding generally to the width of the area elevated at least in part to the reflow temperature of the tin by the welding heat dissipating transversely through said tube from the site of the weld therealong.
Claim 5
Dependent Claim
46 words
The method of claim 2 in which the step of spraying molten tin onto the inner surface of said tube is continued until the layer of sprayed tin is somewhat greater in thickness than the original coating of tin along the inner surface of the tube.
Claim 6
Dependent Claim
64 words
The method of claim 2 in which the step of elevating the temperature of said overlapping edge portions is effected by resistance welding the same, and in which the step of spraying molten tin onto the inner surface of said tube closely follows the welding step so as to minimize escape of heat from said tube to the ambient environment in which it resides.
Claim 7
Dependent Claim
29 words
The method of claim 4 in which said welding and spraying steps are respectively effected at spaced stations, and in which said tube is continuously moved through said stations.
Claim 8
Dependent Claim
46 words
The method of claim 5 in which the step of spraying molten tin onto the inner surface of said tube is continued until the layer of sprayed tin is somewhat greater in thickness than the original coating of tin along the inner surface of the tube.
Claim 9
Dependent Claim
182 words
In a method of making the body tube for a relatively large metal container adapted to receive and store food products and the like therein from a metal sheet pLated along one side thereof with a coating of tin, the steps after formation of such a sheet into a tubular configuration with the longitudinal edge portions thereof overlapping and elevating the temperature of such edge portions to a value sufficient to weld the same and thereby constrain the sheet in tubular form with the tin coating thereon oriented along the inner surface thereof, spraying molten tin onto the inner surface of said tube along a longitudinally extending band having a transverse width embodying said weld and corresponding generally to the width of the area elevated at least in part to the reflow temperature of the molten tin by the welding heat dissipating transversely through said tube from the site of the weld therealong, and adding supplemental heat to said tube along the longitudinally extending band thereof subsequent to welding said overlapping edge portions and prior to spraying molten tin along said band.
Claim 10
Dependent Claim
182 words
In a method of making the body tube for a relatively large metal container adapted to receive and store food products and the like therein from a metal sheet pLated along one side thereof with a coating of tin, the steps after formation of such a sheet into a tubular configuration with the longitudinal edge portions thereof overlapping and elevating the temperature of such edge portions to a value sufficient to weld the same and thereby constrain the sheet in tubular form with the tin coating thereon oriented along the inner surface thereof, spraying molten tin onto the inner surface of said tube along a longitudinally extending band having a transverse width embodying said weld and corresponding generally to the width of the area elevated at least in part to the reflow temperature of the molten tin by the welding heat dissipating transversely through said tube from the site of the weld therealong, and adding supplemental heat to said tube along the longitudinally extending band thereof subsequent to welding said overlapping edge portions and prior to spraying molten tin along said band.
Claim 11
Dependent Claim
86 words
The method of claim 7 in which the step of elevating the temperature of said overlapping edge portions is effected by resistance welding the same, in which the step of depositing tin onto the inner surface of said tube closely follows the welding step so as to minimize escape of heat from said tube to the ambient environment in which it resides, in which said welding and depositing steps are respectively effected at spaced stations, and in which said tube is continuously moved through said stations.
Claim 12
Dependent Claim
184 words
In a method of making the body tube for a relatively large metal container adapted to receive and store food products and the like therein from a metal sheet plated along one side thereof with a coating of tin, the steps after formation of such a sheet into a tubular configuration with the longitudinal edge portions thereof overlapping and elevating the temperature of such edge portions to a value sufficient to weld the same and thereby constrain the sheet in tubular form with the tin coating thereon oriented along the inner surface thereof, spraying molten tin onto the inner surface of said tube along a longitudinally extending band having a transverse width embodying said weld and corresponding generally to the width of the area elevated at least in part to the reflow temperature of the molten tin by the welding heat dissipating transversely through said tube from the site of the weld therealong, and scaling the inner surface of said tube along said longitudinally extending band subsequent to welding said longitudinal edge portions and prior to spraying molten tin along the longitudinally extending band.
Claim 13
Dependent Claim
184 words
In a method of making the body tube for a relatively large metal container adapted to receive and store food products and the like therein from a metal sheet plated along one side thereof with a coating of tin, the steps after formation of such a sheet into a tubular configuration with the longitudinal edge portions thereof overlapping and elevating the temperature of such edge portions to a value sufficient to weld the same and thereby constrain the sheet in tubular form with the tin coating thereon oriented along the inner surface thereof, spraying molten tin onto the inner surface of said tube along a longitudinally extending band having a transverse width embodying said weld and corresponding generally to the width of the area elevated at least in part to the reflow temperature of the molten tin by the welding heat dissipating transversely through said tube from the site of the weld therealong, and scaling the inner surface of said tube along said longitudinally extending band subsequent to welding said longitudinal edge portions and prior to spraying molten tin along the longitudinally extending band.
Claim 14
Dependent Claim
86 words
The method of claim 9 in which the step of elevating the temperature of said overlapping edge portions is effected by resistance welding the same, in which the step of depositing tin onto the inner surface of said tube closely follows the welding step so as to minimize escape of heat from said tube to the ambient environment in which it resides, in which said welding and depositing steps are respectively effected at spaced stations, and in which said tube is continuously moved through said stations.
Claim 15
Dependent Claim
38 words
The method of claim 9 in which the further step includes adding supplemental heat to said tube along the longitudinally extending band thereof subsequent to welding said overlapping edge portions and prior to depositing tin along said band.
Claim 16
Dependent Claim
86 words
The method of claim 11 in which the step of elevating the temperature of said overlapping edge portions is effected by resistance welding the same, in which the step of depositing tin onto the inner surface of said tube closely follows the welding step so as to minimize escape of heat from said tube to the ambient environment in which it resides, in which said welding and depositing steps are respectively effected at spaced stations, and in which said tube is continuously moved through said stations.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |