CA1236781A - Top end for a tin - Google Patents
Top end for a tinInfo
- Publication number
- CA1236781A CA1236781A CA000467866A CA467866A CA1236781A CA 1236781 A CA1236781 A CA 1236781A CA 000467866 A CA000467866 A CA 000467866A CA 467866 A CA467866 A CA 467866A CA 1236781 A CA1236781 A CA 1236781A
- Authority
- CA
- Canada
- Prior art keywords
- top end
- substantially flat
- tin
- circumfering
- shaped portion
- 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
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/06—Integral, or permanently secured, end or side closures
- B65D17/08—Closures secured by folding or rolling and pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
- B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
- B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls
- B65D7/34—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A top end for a tin, can or similar container, provided with a seaming edge all round a circumfering groove surrounding the actual wall of the top end, the improvement being that of the actual wall of the top end is provided with a central, at least substantially flat portion (2) and with at least one circumfering, at least substantially flat portion(6, 7) all round the central flat portion, said flat portions being all situated at mutually different levels.
A top end for a tin, can or similar container, provided with a seaming edge all round a circumfering groove surrounding the actual wall of the top end, the improvement being that of the actual wall of the top end is provided with a central, at least substantially flat portion (2) and with at least one circumfering, at least substantially flat portion(6, 7) all round the central flat portion, said flat portions being all situated at mutually different levels.
Description
The invention relates to a top end for a tin can or similar container, in which said top end has been pr~vided with a seaming edge all round a circumfering groove surrounding the actual wall of the top end, in which the wall of the top end has been provided with reinforcing deformations.
The known top ends generally applied until the time of invention, have been provided with one or more concentric reinforcing deformations in the form of circular buckles or ribs in the top end wall~ The top end wall is, with the possible exception of these reinforcing ribs, situated at a lower level with respect to the seaming edge. This lower level is necessary for working the seaming edge by means of a seaming head in order to attach the top end to a cylinder wall for manufacturing a tin.
A drawback of such known top ends is that they bulge out and/or are plastic-deformed at the circumfering groove when high pressure which will arise during for instance sterilizing the tin and its contents to prevent this bulging phenomenom from occurring, the top end may be provided with several ribs that improve the elasticity of the top end, or the top end may be made of thicker sheet metal, but in this way more material is used and, moreover, the bending ability is reduced, so a stronger force is needed for manufacturing and shaping the top end.
It i5 also a drawback that the seaming edge may be overloaded under high internal pressure in the tin, which may cause leakages. In most cases this drawback may be prevented by applying an elastic cooking ridge in the top end.
~L~3~7~
Another drawback of the known top ends is that, due to the strong profiling because of the ribs, there is little flat surface left on the top end for applying information such as batch codes, dates etc.
It is an object of the present invention to remove the drawbacks stated above. The top end according to the invention is characterized in that the actual wall of the top end is provided with a central, at least substantially 1at portion and with at least one circumfering, at least substantially flat portion all around the central flat poxtion, said flat portions all being situated at mutually different levels. The circumfering flat portion adjacent to the circumfering groove is situated higher than the bottom of the circumfering groove and the possibly present second flat circular portion adjacent to said circumfering flat portion is situated lower than the circumfering flat portion, whereas the central, flat portion is situated lower or higher than the second flat portion.
By a flat portion of the top end wall of a flat or nearly flat (slightly conical) surface is meant that is parallel to or nearly parallel to the surface in which the seaming edge is situated.
The top end according to the present invention has been especially designed for a tin with content which has to undergo a sterilization process. The product with which the tin has to be filled, is either at room temperature or cold, and will have about the same pressure after sterilizing as during the filling of the tin. During sterilizing pressures up to 2.5 atmospheres above atmospheric pressure arise inside the tin, so the top end has to be flexible, otherwise the seaming edge is overloaded, which may cause leakages.
The present invention covers a flexible top end which, with the same thickness of shee-t metal as with the known top ends, offers a larger resistance against bulging out and lasting deformation than the known top ends.
By selecting a smaller material thickness, material can be saved whereas the resistance against bulging out and lasting deformation is as with known top ends.
Further saving of material is obtained because the top end according to the invention can ~e made from a piece of material having a smaller surface, because it has less profiling than the top ends known.
Moreover, on the top end invented there are flat surfaces of sufficient size for applying information, such as batch codes, dates etc., for example by depressing, imprinting and the like.
Other small unevenesses, such as prepressed indents for the sake of opening the tin (pouring indents), impressed logos and the like can be present on these flat surfaces. Furthermore, means known per se for opening tins without tools such as a pull ring and a pull tab, can be present in these flat surfaces.
The present top end may be used for tins containing all kinds of sterilized or non-sterilized products which cause no or little underpressure in the tin when the product is cooled down to at least room temperature.
And, finally, the ring-shaped disc-shaped flat surfaces of the top end give the tin a nice appearance.
The invention will now be elucidated with the help of the appended drawing.
Fig. 1 is a plan view of a top end according to the present invention in a modification having two concentric flat surfaces.
Fig. 2 is a cross section of the top end along the line II~II in Fig. 1.
Fig. 3 is a plan view of a top end according to the present invention in a modification having three concentric flat surfaces.
Fig. ~ is a cross section of the top end according to the line IV-IV in Fig. 3.
~3~
The top end according to Fig. 1 and 2 has been provided with a circumfering groove 3 all around a ring-shaped flat surface 6 which is situated higher than the bottom of the circumfering groove 3, but lower than the top .surface 4 of the seaming edge all around the circumfering groove. The distance (e) between the back side of sur~ace 6 and the bottom surface of the circumfering groove 3 amounts to at least one-sixth, five-sixth at the most and preferably between one-third and two-third of the total height of the lid (h).
A disc-shaped flat surface 2 is centrally situated within the ring-shaped surface 6 at a lower level with respect to said ring-shaped surface.
The width of the circumfering groove 3 has to be at least sufficient for receiving seaming implements in order to seam the seaming edge 5 onto a cylinder wall to, in this way, attach the top end to the cylinder wall for manufacturing a tin, can or similar container.
In Fig. 3 and 4 another modification of the top end according to the present invention is shown, in which the only difference with respect to the modification according to figures 1 and 2 is that between the central surface 2 and the ring-shaped surface 6 adjacent to the circumfering groove a thircl flat surface 7 is presen-t. This third surface 7 is situated lower than the ring-shaped surface 6 adjacent -to the circumfering groove 3, whereas the central surface 2 may be situated higher than the third surface 7 as is indicated in Fig. 4 with a line drawing, but the central surface 2 may also be situated lower than the third surface 7 as is indicated by a dotted line in Fig. ~.
The top ends according to the present invention may be made of thin sheet metal, such as tin plate, electrolytically chromium coated steel (ECCS) or aluminum.
The flat surfaces 2, 6 and 7 may also be slightly cone-shaped and/or may be provided with pouring indents, ~3~
impressed inscriptions, rupture lines, pull tabs and/or pull rings which are known per se and therefore have not been indicated in the drawing.
It is obvious that minor changes in the details and the arrangement of the portions of the top ends may be made without departing from the spirit of the invention as set forth in the appended claims.
It is obvious also that the invented and claimed top end may be used as a bottom end as well for manufacturing a tin, can or similar container.
The known top ends generally applied until the time of invention, have been provided with one or more concentric reinforcing deformations in the form of circular buckles or ribs in the top end wall~ The top end wall is, with the possible exception of these reinforcing ribs, situated at a lower level with respect to the seaming edge. This lower level is necessary for working the seaming edge by means of a seaming head in order to attach the top end to a cylinder wall for manufacturing a tin.
A drawback of such known top ends is that they bulge out and/or are plastic-deformed at the circumfering groove when high pressure which will arise during for instance sterilizing the tin and its contents to prevent this bulging phenomenom from occurring, the top end may be provided with several ribs that improve the elasticity of the top end, or the top end may be made of thicker sheet metal, but in this way more material is used and, moreover, the bending ability is reduced, so a stronger force is needed for manufacturing and shaping the top end.
It i5 also a drawback that the seaming edge may be overloaded under high internal pressure in the tin, which may cause leakages. In most cases this drawback may be prevented by applying an elastic cooking ridge in the top end.
~L~3~7~
Another drawback of the known top ends is that, due to the strong profiling because of the ribs, there is little flat surface left on the top end for applying information such as batch codes, dates etc.
It is an object of the present invention to remove the drawbacks stated above. The top end according to the invention is characterized in that the actual wall of the top end is provided with a central, at least substantially 1at portion and with at least one circumfering, at least substantially flat portion all around the central flat poxtion, said flat portions all being situated at mutually different levels. The circumfering flat portion adjacent to the circumfering groove is situated higher than the bottom of the circumfering groove and the possibly present second flat circular portion adjacent to said circumfering flat portion is situated lower than the circumfering flat portion, whereas the central, flat portion is situated lower or higher than the second flat portion.
By a flat portion of the top end wall of a flat or nearly flat (slightly conical) surface is meant that is parallel to or nearly parallel to the surface in which the seaming edge is situated.
The top end according to the present invention has been especially designed for a tin with content which has to undergo a sterilization process. The product with which the tin has to be filled, is either at room temperature or cold, and will have about the same pressure after sterilizing as during the filling of the tin. During sterilizing pressures up to 2.5 atmospheres above atmospheric pressure arise inside the tin, so the top end has to be flexible, otherwise the seaming edge is overloaded, which may cause leakages.
The present invention covers a flexible top end which, with the same thickness of shee-t metal as with the known top ends, offers a larger resistance against bulging out and lasting deformation than the known top ends.
By selecting a smaller material thickness, material can be saved whereas the resistance against bulging out and lasting deformation is as with known top ends.
Further saving of material is obtained because the top end according to the invention can ~e made from a piece of material having a smaller surface, because it has less profiling than the top ends known.
Moreover, on the top end invented there are flat surfaces of sufficient size for applying information, such as batch codes, dates etc., for example by depressing, imprinting and the like.
Other small unevenesses, such as prepressed indents for the sake of opening the tin (pouring indents), impressed logos and the like can be present on these flat surfaces. Furthermore, means known per se for opening tins without tools such as a pull ring and a pull tab, can be present in these flat surfaces.
The present top end may be used for tins containing all kinds of sterilized or non-sterilized products which cause no or little underpressure in the tin when the product is cooled down to at least room temperature.
And, finally, the ring-shaped disc-shaped flat surfaces of the top end give the tin a nice appearance.
The invention will now be elucidated with the help of the appended drawing.
Fig. 1 is a plan view of a top end according to the present invention in a modification having two concentric flat surfaces.
Fig. 2 is a cross section of the top end along the line II~II in Fig. 1.
Fig. 3 is a plan view of a top end according to the present invention in a modification having three concentric flat surfaces.
Fig. ~ is a cross section of the top end according to the line IV-IV in Fig. 3.
~3~
The top end according to Fig. 1 and 2 has been provided with a circumfering groove 3 all around a ring-shaped flat surface 6 which is situated higher than the bottom of the circumfering groove 3, but lower than the top .surface 4 of the seaming edge all around the circumfering groove. The distance (e) between the back side of sur~ace 6 and the bottom surface of the circumfering groove 3 amounts to at least one-sixth, five-sixth at the most and preferably between one-third and two-third of the total height of the lid (h).
A disc-shaped flat surface 2 is centrally situated within the ring-shaped surface 6 at a lower level with respect to said ring-shaped surface.
The width of the circumfering groove 3 has to be at least sufficient for receiving seaming implements in order to seam the seaming edge 5 onto a cylinder wall to, in this way, attach the top end to the cylinder wall for manufacturing a tin, can or similar container.
In Fig. 3 and 4 another modification of the top end according to the present invention is shown, in which the only difference with respect to the modification according to figures 1 and 2 is that between the central surface 2 and the ring-shaped surface 6 adjacent to the circumfering groove a thircl flat surface 7 is presen-t. This third surface 7 is situated lower than the ring-shaped surface 6 adjacent -to the circumfering groove 3, whereas the central surface 2 may be situated higher than the third surface 7 as is indicated in Fig. 4 with a line drawing, but the central surface 2 may also be situated lower than the third surface 7 as is indicated by a dotted line in Fig. ~.
The top ends according to the present invention may be made of thin sheet metal, such as tin plate, electrolytically chromium coated steel (ECCS) or aluminum.
The flat surfaces 2, 6 and 7 may also be slightly cone-shaped and/or may be provided with pouring indents, ~3~
impressed inscriptions, rupture lines, pull tabs and/or pull rings which are known per se and therefore have not been indicated in the drawing.
It is obvious that minor changes in the details and the arrangement of the portions of the top ends may be made without departing from the spirit of the invention as set forth in the appended claims.
It is obvious also that the invented and claimed top end may be used as a bottom end as well for manufacturing a tin, can or similar container.
Claims
1. A top end for a tin, can or similar container, provided with a circumferential rolled seaming edge surrounding an annular groove defining the perimeter of the top end wall, in which the top end wall is provided with a substantially flat, central, circular disc-shaped portion and at least one substantially flat, ring-shaped portion at the circumference of said disc-shaped portion, said substantially flat portions ]ying in planes at different levels, wherein the substantially flat, ring-shaped portion vicinal to the annular groove lies at a lower level than the rolled seaming edge and at a higher level than the adjacent inwards situated, substantially flat portion, characterized in that said annular groove lies directly adjacent to said vicinal, substantially flat, ring-shaped portion without bead between said groove and said portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8303931 | 1983-11-16 | ||
| NL8303931A NL8303931A (en) | 1983-11-16 | 1983-11-16 | SIDE LID FOR SERVER BUSHING. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1236781A true CA1236781A (en) | 1988-05-17 |
Family
ID=19842720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000467866A Expired CA1236781A (en) | 1983-11-16 | 1984-11-15 | Top end for a tin |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0144102B1 (en) |
| AT (1) | ATE43550T1 (en) |
| CA (1) | CA1236781A (en) |
| DE (1) | DE3478427D1 (en) |
| NL (1) | NL8303931A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005024219B3 (en) * | 2005-05-25 | 2006-07-13 | Ball Packaging Europe Gmbh | Lid with surround to connect it to container using guide columns or pins jutting out vertically from lid which can be used to hold other parts if required |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL72920C (en) * | 1900-01-01 | |||
| US2119533A (en) * | 1937-05-10 | 1938-06-07 | Continental Can Co | Easy opening container |
| FR1421122A (en) * | 1964-01-23 | 1965-12-10 | Carnation Co | Metal box closure |
| US3912109A (en) * | 1973-11-15 | 1975-10-14 | American Can Co | Metal container and method for making same |
-
1983
- 1983-11-16 NL NL8303931A patent/NL8303931A/en not_active Application Discontinuation
-
1984
- 1984-11-09 EP EP84201620A patent/EP0144102B1/en not_active Expired
- 1984-11-09 DE DE8484201620T patent/DE3478427D1/en not_active Expired
- 1984-11-09 AT AT84201620T patent/ATE43550T1/en not_active IP Right Cessation
- 1984-11-15 CA CA000467866A patent/CA1236781A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0144102B1 (en) | 1989-05-31 |
| ATE43550T1 (en) | 1989-06-15 |
| EP0144102A1 (en) | 1985-06-12 |
| DE3478427D1 (en) | 1989-07-06 |
| NL8303931A (en) | 1985-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |