 |
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| Closing ? Seaming ? |
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| Closing of metal cans is performed by a can seamer. This machine seals the can bottom and lid to the can body. The seam that is formed in this process is leak-proof. |
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| The metal food can is more than 200 years old. Today it remains one of the most economical, environmentally friendly and, above all, safest packaging forms. |
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| History: |
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It all started in 1809 when frenchman Nicholas Appert had the idea of packing food into bottles, like wine. It was only in the early 1900s that double seaming was first applied.
The first modern cans were three-piece soldered cans. In 1963 the first two-piece cans were introduced and were received with enthusiasm because they typically used less steel. Today, grocery shoppers today can select from an array of easy-to-use and convenient metal packages, including: containers with twist-top, resealable lids, easy-open cans with pull-tab lids made with steel, aluminum or plastic and even distinct, easy-to-grasp metal cans shaped like bowls, kettles and even squares. |
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| Environmental and nutritional benefits: |
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| Environmental conscious consumers can rejoice because the food can is 100 percent recyclable. Theyre recycling rate is more than two-and-a-half times higher than that of most other packaging options. Steel food containers can be recycled again and again without losing strength or quality. Once the cans are sealed and heat processed, the food maintains its high quality for more than two years. |
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| Seaming: |
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| The seam is made by mechanically overlapping the two layers to form a hook. Different parameters of the hook are measured and monitored to check the integrity of the seam under different conditions. The shape of the double seam is determined by the shape of the seamer roll profile and the relative position. During the can seaming process, the seamer chuck holds the can while the rolls rotate around it. |
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| Can , Tin Can General Dimensions |
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|
NAME |
DIMENSIONS |
Total Capacity, avoir oz. of Water at 68degF |
No. 2 Can Equivalent |
|
6 OZ |
202 x 308 |
6.08 |
0.295 |
|
8 OZ Short |
211 x 300 |
7.93 |
0.386 |
|
8 OZ Tall |
211 x 304 |
8.68 |
0.422 |
|
No. I (Picnic) |
211 x 400 |
10.94 |
0.532 |
|
No. 211 Cylinder |
211 x 414 |
13.56 |
0.660 |
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No. 300 |
300 x 407 |
15.22 |
0.741 |
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No. 300 Cylinder |
300 x 509 |
19.40 |
0.945 |
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No. I Tall |
301 x 411 |
16.70 |
0.813 |
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No. 303 |
303 x 406 |
16.88 |
0.821 |
|
No. 303 Cylinder |
303 x 509 |
21.86 |
1.060 |
|
No. 2 Vacuum |
307 x 306 |
14.71 |
0.716 |
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No. 2 |
307 x 409 |
20.55 |
1.000 |
|
Jumbo |
307 x 510 |
25.80 |
1.2537 |
|
No. 2 Cylinder |
307 x 512 |
26.40 |
1.284 |
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No. 1.25 |
401 x 206 |
13.81 |
0.672 |
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No. 2.5 |
401 x 411 |
29.79 |
1.450 |
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No. 3 Vacuum |
404 x 307 |
23.90 |
1.162 |
|
No. 3 Cylinder |
404 x 700 |
51.70 |
2.515 |
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No. 5 |
502 x 510 |
59.10 |
2.8744 |
|
No. 10 |
603 x 700 |
109.43 |
5.325 |
| The capacity of a 16-oz. glass jar is approximately No. 303 tin can. |
| The capacity of a No. 2.5 glass jar is approximately the same as the No. 2.5 tin can. | |
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| Explanation of Dimensional Food Can Standards |
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| Metal can sizes used in industry in the U.S.A. are derived from nominal outside dimensions. Measurements are made of the empty round can before seaming on the packers' end. |
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| While such dimensions may be expressed in inches, the custom is to use a conventionalized method in which three-digit numbers are used to express each dimension. The first digit indicates the number of whole inches in a dimension, and the second and third digits indicate the fractional inches as sixteenths of an inch. Thus: |
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303 x 406 means 3-3/16 x 4-6/16 inches
307 x 512 means 3-7/16 x 5-12/16 inches
603 x 700 means 6-3/16 x 7 inches |
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| The first three-digit number describing a round can indicates the diameter measured across the outside of the chime on the seamed end. The second three-digit number indicates the overall height of the can with one end on. |
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| In stating the dimensions of oval, obround, or obrotund cans, outside dimensions are used, the dimensions of the opening stated first, followed by the height. Thus, there will be three sets of figures: the first two being the long and short axis of the opening. Their interpretation in inches and sixteenths of an inch is the same as with round cans. An oval can might have the size given as 402 x 304 x 612, which would mean that the oval opening was 4-2/16 x 3-4/16 inches and the height was 6-12/16 inches. |
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| In the table below the "No.2 Equivalent" indicates the number of No.2 cans equal to each of the cans designated in Column 1. |
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|
202 Can Specifications |
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| ENDS |
| Curl Diameter |
2.340 ± .006 |
| Curl Height* |
0.080 ± .005 |
| Curl Opening Diameter |
2.270 Min. |
| Countersink Depth |
0.270 ± .005 |
| Countersink Radius |
0.020 Ref. |
| Countersink Diameter |
1.913 Ref. |
| Chuck Wall Angle |
12° Ref. |
| Panel Height |
0.090 ± .005 |
| End Flange Width |
0.215 Ref. | |
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| *BMC .083 Nominal | |
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|
202 End Specifications |
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| CANS |
| Body Outside Diameter* |
2.602 ± .007 |
| Flange Radius |
0.050 Ref. |
| Flange Width |
0.082 ± .008 |
| Flange Can Height |
4.812 ± .015 |
| Flange Diameter |
2.255 Max. |
| Neck Plug Diameter |
2.063 ± .007 |
| Neck Seaming Clearance |
0.120 Min. |
| Headspace |
0.470 ± .020 | | | |
