CA2109871A1 - A metallic can seaming process - Google Patents
A metallic can seaming processInfo
- Publication number
- CA2109871A1 CA2109871A1 CA 2109871 CA2109871A CA2109871A1 CA 2109871 A1 CA2109871 A1 CA 2109871A1 CA 2109871 CA2109871 CA 2109871 CA 2109871 A CA2109871 A CA 2109871A CA 2109871 A1 CA2109871 A1 CA 2109871A1
- Authority
- CA
- Canada
- Prior art keywords
- seaming
- seam
- micro
- dimensions
- roll
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
- B21D51/30—Folding the circumferential seam
- B21D51/32—Folding the circumferential seam by rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
Abstract
A can making process for forming a seam between a can end and a body of a can by micro-seaming includes the step of taking a flanged body of a can and at least one curled can end, the can body and the curled can end each having profile and curling dimensions necessary for connecting one to the other; the can end is made of sheet material double reduced and the can body is made of any commercially available material. The process includes also the step of micro-seaming the can end to body of the can to provide reduction of cover and body hooks as well as length of seam and fixing folds without changing the volumetric capacity of the can.
Description
. - -I 2109g71 ~A METALLIC CAN SEAMING PROCESS~
The object of the present invention patent is a metallic can manufacturing process and refers particularly to the means of seaming the top and the bottom by which, due to a subs-tancial reduction of the`dimensions of the hooks and other fixing folds, a considerable and advantageous reduction of the diameters of the cut-outs of the material employed for the manufacture of the top and end of a can is obtained, as well as, consequently, a significative reduction of the height of the can body and this without change of the holding capacity of the can. This is a process from which substantial savings of metal sheet result, both in quantity as well as by employing a thinner and harder sheet metal, i.
e., of 0,16mm thickness and by using DR8 heat treatment, the price of which is 21.2 to 28.3% lower than that of the conventionally used metal sheet, i.e., of 0.22 to 0,24mm thickness and the normal temper required As is known to those with knowledge of the matter, the currently used conventional cans designed to serve as packing for the most diverse products, particularly for food products and the so-called sanitary cans, are normally obtained by using tinplate of 0.22 to 0.24mm thickness with the normal temper required for the top and the end of a-can, features which would also allow the employment of this metal sheet for micro-seaming, however, without the advantages of large savings of 21.2 to 28.3% obtained a~ a result of the use of a metal sheet of 0.16mm thickness and DR8 temper, as outlined by this new process.
, The subject new metallic can manufacturing process will provide substantial savings, both by the substantial reduction of diameters of the cut-outs for the top and the end of a can, and this as a consequence of the reduction of the dimensions of the hooks and other fixing folds, as well as by the reduction of height provided to the can body without changing its holding capacity, savings which become - 2 - ~109871 more significant due to the employment of a thinner and harder metal sheet, i.e. of 0.16mm thickness with DR8 temper, as compared to the conventionally used metal sheet of 0.22 to 0.24mm thickness and the normal temper required for the top and the end of a can.
This new process is possible for metallic can with an electri-cally welded (3 piece cans) or deep drawn body (2 piece cans), i.e., those bodies with no lap or two thicknesses where the joint is obtained by folds soldered with tin or lead or thermoplasts, a condition which renders this new process infeasible.
The new metallic can manufacturing process as stated before is represented in the attached drawings which show, for comparison purposes, both the cut-out discs of the top and end, as well as the fixed parts and the can body, with their respective dimensions, as follows:
Fig. 1 is a sectional view, showing the seam obtained by the conventional process, i.e., by employing a metal sheet of 0.22mm thickness with relatively larger seaming dimensions;
Fig. 2 is a sectional view, showing a micro-seam obtained by the new process, i.e., by employing a metal sheet of lesser thickness, i.e., 0.16mm and a harder one, i.e., with DR8 temper, of which the seaming dimensions are considerably reduced in comparison with the conventional process;
Fig. 3 is a side view of a r.eady or seamed can with conventional seam, thé height of its body being considerably greater as compared to the can obtained by the new seaming process;
Fig. 4 is a side view of a ready or seamed can, the seam of whicn has been o~tained by the new process, the height of its body showing to be considerably lower, without cha~ging its volumetric capacity;
. ~ 3 ~ ~l ~9~7 1 Fig. S is a top view of the disc designed for the top and end of a can, cut with the normally used diameter employed with conventional seaming process;
Fig. 6 is a top view of a disc designed for the top and end of a can, ~cut with a considerably smaller diameter, used for the micro-seaming and in accordance to the object of the new process;
Fig. 7 is a top view of an already stamped top and end of a can, according to the dimensions used for conventional seaming process;
Fig. 8 is a top view of an already stamped top and end of a can, according to the dimensions used for the new seaming process;
Fig. 9 is a sectional view of an already stamped top and end of a can, showing the profile and curling dimensions used for conventional seaming process;
Fig. 10 is a sectional view of an already stamped top and end of a can, showing the profile and reduction of curling dimensions for the new seaming process;
Fig. 11 is a side view of a cylindrical can body with the height dimension designed for conventional seaming process;
Fig. 12 is a side view of a cylindrical can body with the considerably reduced heiqht, destinated for the new micro-seaming process;
Fig. 13 is a side view of a flanged can body and its dimensions normally used for conventional seaming process;
Fig. 14 side view of a flanged can body showing sensibly reduced dimensions according to the micro-seaming process;
.. ... . , . . ,. .. . .. . , . _. .
, ~ 4 ~ ~ 109871 Fig- 15 is a diagram of seamer head chuck and rolls used for seaming the cans;
Fig. 16 shows a profile and dimensions of a first seam roll for micro-seam;
Fig. 17 shows aprofile and dimensions of a second seam roll for micro-seam;
Fig. 18 is a side view of the cover or can end and the can body before the first seaming operation;
Fig. 19 is a side view of the micro-seam after the first seam roll operation;
Fig. 20 is a side view of the micro-seam after the second seam roll operation;
Fig. 21 shows a profile and dimensions of a first seam roll for conventional seam;
Fig. 22 shows a profile and dimensions of a second seam roll for conventional seam;
Fig. 23 is a side view of the conventional seam after the first seam roll operation; and Fig. 24 is a side view of the conventional seam after the second seam roll operation.
Describing in more detail the new can manufacturing process consists in using seaming equipment well known in the art.
Seaming operations are currently effected by using a type of machine of which the essential components are comprised of at least (Fig. 15); one or more stations for the closing machine, having a base plate 8, a seaming chuck 1, at least one first operation roll 4, and one second operation roll 5.
The base plate; or can holding chuck, of the machine, supports the can body 6. The snug fitting seaming chuck holds the can cover (can end) 7 in place on the can body and acts as a back-up for the seaming roll pressure.
The current micro-seaming uses seaming equipment exactly the same as the tradi~ional seaming equipment described above, except for the redesigning and redimensioning of the first and second operation rolls (Figs 16 and 17).
f~09871 ~he redesigning and redimensioning of the first and second operation rolls vary according to the thickness and hardness of the metallic material as well as the diameter of the can.
This applies both to cans produced by micro-seaming and cans produced by conventional seaming. Therefore, the designs and dimensions of the first and second operation rolls shown in Figs. 16 and 17 are valid for micro-seaming can ends ( to bodies of cans) with 73mm diameter produced with 0.16mm thick material and DR8 temper. Comparatively the Figs. 21 and 22 show the designs and dimensions of the first and second operation rolls for conventionally seaming can ends ~to bodies of cans) with 73mm diameter produced with 0.22 thick material and T61 hardness.
The above example is one illustration of micro-seaming. It is unde~tood that other dimensions can be used for micro-seaming and the present application is not limited to this one example.
Consequently, for can ends having diameters greater or smaller than 73mm, the measurements shown in Figs. 16, 17, 21 and 22 (units are calibrated in mm) should be revised accordingly with reference to the above illustrated example.
This applies both to conventional seaming and micro-seaming.
All the stages of formation of micro-seam are illustrated in Figs. 18, 19, 20 and 2. In the first operation, Figs. 18 and 19, the micro-curl of the end is interlocked (sometimes referred to as engaged) with the micro-flange 3 of the can body of a first operation roll 4 having a specially contoured groove to be pressed against the seaming chuck 1.
After the first seam operation is completed, the first operation roll is retracted and no longer contacts the can cover (can end). The second operation roll 5 (Fig. 20) has a different groove profile from that of the first operation roll. This groove is flatter than the first operation groove and is designed to press the preformed hooks together; to iron out wrinkles in the cover hook and to obtain micro-seam tightness. A good and uniform seaming is obtained with this new can manufacturing process and with , . ... ..... ..
- 6 ~ 210987 ~
Sp~cial measurements in the cover hook, body hook, length of the micro-seam and other folds (see Fig. 2).
The designing of the curves and dimensioning of the first and second operation rolls for a conventional seam are shown in Figs. 21 and~22. All the stages of formation of a conventional seam are illustrated in Figs. 23 and 24. In the first operation, Fig. 23, the curling of the can end 10 is interlocked with the flange 11 of the can body of a first operation roll 12 having a specially contoured groove to be pressed against the seaming chuck 1. After the first seam operation is completed, the first operation roll 12 is retracted and no longer contacts the can cover (can end).
The second operation roll 13 (Fig. 24) has a different groove profile from that of the first operation roll. This groove is flatter than the first operation groove and is designed to press the preformed hooks together to obtain a seam tightness with special measurements in the cover hook, body hook, length of seam and other folds (see Fig. 1).
The micro-seam improvements enables one to obtain cans with substantial materials savings, due to the use of a thinner metal sheet, i.e., of 0.16mm thickness which is relatively harder, i.e., with DR8 temper, thus replacing the conventio-nally used metal sheet for the known seaming process, where what is normally employed is a metal sheet of 0.22 to 0.24mm, which is relatively softer, and this without affecting the volumetric capacity of the cans thus obtained.
This new can manufacturing process allows many advantageous material savings, these savings result from the considerable reduction of the diameters of the discs which form the top and end of a can, as shown in Figs. 5 and 6, as well as a reduction of the hooks dimensions and others seaming dimensions as shown on Figs. 1 and 2 and Figs. 9 and 10 in addition more material savings result from a reducdtion of the heigth of the cylindrical body of the can, as shown on Figs. 3 and 4 and on Figs. 11 through 14 of the attached drawings. These reductions are obtained without affecting the volumetric capacity of the cans thus obtained through the new micro-seaming process.
~ 7 ~
~or a perfect evaluation of the actua~ ~ Q~t7ages resulting from this new process it is worthwile to note that, in addition to this substan~ial materials savings, allowed by the use of a double reduced metal shee~, i.e., with DR8 temper and 0.16mm thickness in manufacturing of the tops and ends of cans, the~use of this lower price metal sheet is not possible for the conventional type of seaming. The high hardness of the material and its thinness would cause folds on the hooks to develop enormous deformations which would be transmitted into a general seaming deformation which, in addition to an extremely bad appearance of the can, leading to its technical condemnation for not providing a perfect seal and, consequently, an ideal hermetic seam, which represent the fundamental requirements of a good seaming and quality of these containers.
The object of the present invention patent is a metallic can manufacturing process and refers particularly to the means of seaming the top and the bottom by which, due to a subs-tancial reduction of the`dimensions of the hooks and other fixing folds, a considerable and advantageous reduction of the diameters of the cut-outs of the material employed for the manufacture of the top and end of a can is obtained, as well as, consequently, a significative reduction of the height of the can body and this without change of the holding capacity of the can. This is a process from which substantial savings of metal sheet result, both in quantity as well as by employing a thinner and harder sheet metal, i.
e., of 0,16mm thickness and by using DR8 heat treatment, the price of which is 21.2 to 28.3% lower than that of the conventionally used metal sheet, i.e., of 0.22 to 0,24mm thickness and the normal temper required As is known to those with knowledge of the matter, the currently used conventional cans designed to serve as packing for the most diverse products, particularly for food products and the so-called sanitary cans, are normally obtained by using tinplate of 0.22 to 0.24mm thickness with the normal temper required for the top and the end of a-can, features which would also allow the employment of this metal sheet for micro-seaming, however, without the advantages of large savings of 21.2 to 28.3% obtained a~ a result of the use of a metal sheet of 0.16mm thickness and DR8 temper, as outlined by this new process.
, The subject new metallic can manufacturing process will provide substantial savings, both by the substantial reduction of diameters of the cut-outs for the top and the end of a can, and this as a consequence of the reduction of the dimensions of the hooks and other fixing folds, as well as by the reduction of height provided to the can body without changing its holding capacity, savings which become - 2 - ~109871 more significant due to the employment of a thinner and harder metal sheet, i.e. of 0.16mm thickness with DR8 temper, as compared to the conventionally used metal sheet of 0.22 to 0.24mm thickness and the normal temper required for the top and the end of a can.
This new process is possible for metallic can with an electri-cally welded (3 piece cans) or deep drawn body (2 piece cans), i.e., those bodies with no lap or two thicknesses where the joint is obtained by folds soldered with tin or lead or thermoplasts, a condition which renders this new process infeasible.
The new metallic can manufacturing process as stated before is represented in the attached drawings which show, for comparison purposes, both the cut-out discs of the top and end, as well as the fixed parts and the can body, with their respective dimensions, as follows:
Fig. 1 is a sectional view, showing the seam obtained by the conventional process, i.e., by employing a metal sheet of 0.22mm thickness with relatively larger seaming dimensions;
Fig. 2 is a sectional view, showing a micro-seam obtained by the new process, i.e., by employing a metal sheet of lesser thickness, i.e., 0.16mm and a harder one, i.e., with DR8 temper, of which the seaming dimensions are considerably reduced in comparison with the conventional process;
Fig. 3 is a side view of a r.eady or seamed can with conventional seam, thé height of its body being considerably greater as compared to the can obtained by the new seaming process;
Fig. 4 is a side view of a ready or seamed can, the seam of whicn has been o~tained by the new process, the height of its body showing to be considerably lower, without cha~ging its volumetric capacity;
. ~ 3 ~ ~l ~9~7 1 Fig. S is a top view of the disc designed for the top and end of a can, cut with the normally used diameter employed with conventional seaming process;
Fig. 6 is a top view of a disc designed for the top and end of a can, ~cut with a considerably smaller diameter, used for the micro-seaming and in accordance to the object of the new process;
Fig. 7 is a top view of an already stamped top and end of a can, according to the dimensions used for conventional seaming process;
Fig. 8 is a top view of an already stamped top and end of a can, according to the dimensions used for the new seaming process;
Fig. 9 is a sectional view of an already stamped top and end of a can, showing the profile and curling dimensions used for conventional seaming process;
Fig. 10 is a sectional view of an already stamped top and end of a can, showing the profile and reduction of curling dimensions for the new seaming process;
Fig. 11 is a side view of a cylindrical can body with the height dimension designed for conventional seaming process;
Fig. 12 is a side view of a cylindrical can body with the considerably reduced heiqht, destinated for the new micro-seaming process;
Fig. 13 is a side view of a flanged can body and its dimensions normally used for conventional seaming process;
Fig. 14 side view of a flanged can body showing sensibly reduced dimensions according to the micro-seaming process;
.. ... . , . . ,. .. . .. . , . _. .
, ~ 4 ~ ~ 109871 Fig- 15 is a diagram of seamer head chuck and rolls used for seaming the cans;
Fig. 16 shows a profile and dimensions of a first seam roll for micro-seam;
Fig. 17 shows aprofile and dimensions of a second seam roll for micro-seam;
Fig. 18 is a side view of the cover or can end and the can body before the first seaming operation;
Fig. 19 is a side view of the micro-seam after the first seam roll operation;
Fig. 20 is a side view of the micro-seam after the second seam roll operation;
Fig. 21 shows a profile and dimensions of a first seam roll for conventional seam;
Fig. 22 shows a profile and dimensions of a second seam roll for conventional seam;
Fig. 23 is a side view of the conventional seam after the first seam roll operation; and Fig. 24 is a side view of the conventional seam after the second seam roll operation.
Describing in more detail the new can manufacturing process consists in using seaming equipment well known in the art.
Seaming operations are currently effected by using a type of machine of which the essential components are comprised of at least (Fig. 15); one or more stations for the closing machine, having a base plate 8, a seaming chuck 1, at least one first operation roll 4, and one second operation roll 5.
The base plate; or can holding chuck, of the machine, supports the can body 6. The snug fitting seaming chuck holds the can cover (can end) 7 in place on the can body and acts as a back-up for the seaming roll pressure.
The current micro-seaming uses seaming equipment exactly the same as the tradi~ional seaming equipment described above, except for the redesigning and redimensioning of the first and second operation rolls (Figs 16 and 17).
f~09871 ~he redesigning and redimensioning of the first and second operation rolls vary according to the thickness and hardness of the metallic material as well as the diameter of the can.
This applies both to cans produced by micro-seaming and cans produced by conventional seaming. Therefore, the designs and dimensions of the first and second operation rolls shown in Figs. 16 and 17 are valid for micro-seaming can ends ( to bodies of cans) with 73mm diameter produced with 0.16mm thick material and DR8 temper. Comparatively the Figs. 21 and 22 show the designs and dimensions of the first and second operation rolls for conventionally seaming can ends ~to bodies of cans) with 73mm diameter produced with 0.22 thick material and T61 hardness.
The above example is one illustration of micro-seaming. It is unde~tood that other dimensions can be used for micro-seaming and the present application is not limited to this one example.
Consequently, for can ends having diameters greater or smaller than 73mm, the measurements shown in Figs. 16, 17, 21 and 22 (units are calibrated in mm) should be revised accordingly with reference to the above illustrated example.
This applies both to conventional seaming and micro-seaming.
All the stages of formation of micro-seam are illustrated in Figs. 18, 19, 20 and 2. In the first operation, Figs. 18 and 19, the micro-curl of the end is interlocked (sometimes referred to as engaged) with the micro-flange 3 of the can body of a first operation roll 4 having a specially contoured groove to be pressed against the seaming chuck 1.
After the first seam operation is completed, the first operation roll is retracted and no longer contacts the can cover (can end). The second operation roll 5 (Fig. 20) has a different groove profile from that of the first operation roll. This groove is flatter than the first operation groove and is designed to press the preformed hooks together; to iron out wrinkles in the cover hook and to obtain micro-seam tightness. A good and uniform seaming is obtained with this new can manufacturing process and with , . ... ..... ..
- 6 ~ 210987 ~
Sp~cial measurements in the cover hook, body hook, length of the micro-seam and other folds (see Fig. 2).
The designing of the curves and dimensioning of the first and second operation rolls for a conventional seam are shown in Figs. 21 and~22. All the stages of formation of a conventional seam are illustrated in Figs. 23 and 24. In the first operation, Fig. 23, the curling of the can end 10 is interlocked with the flange 11 of the can body of a first operation roll 12 having a specially contoured groove to be pressed against the seaming chuck 1. After the first seam operation is completed, the first operation roll 12 is retracted and no longer contacts the can cover (can end).
The second operation roll 13 (Fig. 24) has a different groove profile from that of the first operation roll. This groove is flatter than the first operation groove and is designed to press the preformed hooks together to obtain a seam tightness with special measurements in the cover hook, body hook, length of seam and other folds (see Fig. 1).
The micro-seam improvements enables one to obtain cans with substantial materials savings, due to the use of a thinner metal sheet, i.e., of 0.16mm thickness which is relatively harder, i.e., with DR8 temper, thus replacing the conventio-nally used metal sheet for the known seaming process, where what is normally employed is a metal sheet of 0.22 to 0.24mm, which is relatively softer, and this without affecting the volumetric capacity of the cans thus obtained.
This new can manufacturing process allows many advantageous material savings, these savings result from the considerable reduction of the diameters of the discs which form the top and end of a can, as shown in Figs. 5 and 6, as well as a reduction of the hooks dimensions and others seaming dimensions as shown on Figs. 1 and 2 and Figs. 9 and 10 in addition more material savings result from a reducdtion of the heigth of the cylindrical body of the can, as shown on Figs. 3 and 4 and on Figs. 11 through 14 of the attached drawings. These reductions are obtained without affecting the volumetric capacity of the cans thus obtained through the new micro-seaming process.
~ 7 ~
~or a perfect evaluation of the actua~ ~ Q~t7ages resulting from this new process it is worthwile to note that, in addition to this substan~ial materials savings, allowed by the use of a double reduced metal shee~, i.e., with DR8 temper and 0.16mm thickness in manufacturing of the tops and ends of cans, the~use of this lower price metal sheet is not possible for the conventional type of seaming. The high hardness of the material and its thinness would cause folds on the hooks to develop enormous deformations which would be transmitted into a general seaming deformation which, in addition to an extremely bad appearance of the can, leading to its technical condemnation for not providing a perfect seal and, consequently, an ideal hermetic seam, which represent the fundamental requirements of a good seaming and quality of these containers.
Claims (3)
- Claim 1. A can making process for forming a seam between a can end and a body of a can by micro-seaming which comprises the following steps:
Taking a flanged body of a can and at least one curled can end, said can body and said curled can end each having profile and curling dimensions necessary for connecting one to the other, said can end being made of sheet material double reduced; and said can body being made of any commercially available material; and micro-seaming said can end to body of said can to provide reduction of cover and body hooks as well as length of seam and fixing folds without changing the olumetric capacity of the can. - Claim 2, A process according to claim 3, wherein said can end is made of sheet material double reduced having a thickness of 0.16mm or less.
- Claim 3. A process according to claim 3, wherein said can end is made of sheet material double reduced having a thickness greater than 0.16mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2109871 CA2109871A1 (en) | 1993-11-24 | 1993-11-24 | A metallic can seaming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2109871 CA2109871A1 (en) | 1993-11-24 | 1993-11-24 | A metallic can seaming process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2109871A1 true CA2109871A1 (en) | 1995-05-25 |
Family
ID=4152529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2109871 Abandoned CA2109871A1 (en) | 1993-11-24 | 1993-11-24 | A metallic can seaming process |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2109871A1 (en) |
-
1993
- 1993-11-24 CA CA 2109871 patent/CA2109871A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |