Can end and method for fixing the same to a can body

The tip of a can and the process of attaching it to the body of the can

Full description

Background of the invention:-

This invention relates to an end wall, and in particular, but not necessarily, to an end wall

For the box body and the process of attaching the end wall to the box body by double welding.

US Patent No. 0931020 (KRASKA) describes an enclosure end comprising an outer cover dog, an chuck wall overhanging the inner surface of the cover dog, an externally concave supporting annular protrusion extending radially inward from the chuck wall, and a center plate attached to the inner wall of the supporting protrusion by An externally convex annular bulge. The end of the can bears an internal pressure of 90 pounds per square inch thanks to the inclination or slope of the chuck wall, the outer wall of the protrusion, and the inner wall of it towards a perpendicular line on the central plate. The slope of the envelope wall ranges from 140 D to 16, the slope of the outer wall B is less than 4, and the slope of the inner wall ranges from C10 to 16, which leads to the externally convex bulge. We have found that metal utilization can be improved by increasing the slope of the chuck wall and reducing the width of the supporting ridge.

US Patent No. 2,178,130 (KRASKA) describes a design

An alternative to the case end in which the boring hole has flat inner and outer walls, and the bottom radius is less than three times the thickness of the metal. The wall of the envelope at the end of the can extends at an angle of about 24 verticals. In contrast, our European Patent Application 340559 describes a can end in which the chuck wall extends at an angle between 12 and 20 vertical.

Our European Patent No. 0153115 describes a process for manufacturing a can end suitable for sealing the body of a can containing a beverage such as beer or soft drinks. This enclosure end consists of an outer lip or cover dog, an chuck wall that hangs from the inner surface of the cover dog, and a concave supporting protrusion on the outside extending radially toward

The inside of the chuck wall is the thickened point of contact of the chuck wall with the bulge, and a central plate supported by the interior of the supporting bulge. This case end is usually formed from a coated aluminum alloy such as aluminum magnesium alloy such as alloy 5182.

Our International Patent Application No. 17864/93 describes a can end that fits into a beverage can and consists of a sheet of aluminum/magnesium alloy coated with a semi-crystalline thermoplastic polyester film. This polyester/aluminum alloy plate allows the end of a case to be manufactured with a narrower and stronger supporting protrusion than the cheaper aluminum magnesium alloy.

During the double seaming process, these known types are attached to the end of the box with an annular flange in the chuck, where the flange is of a width and height suitable for insertion into the supporting protrusion, the anti-peaking bead. There is a risk of scuffing if this tight ring slips. Furthermore, the narrow ring lip of the chuck is susceptible to damage

With the development of a can end using less metal while maintaining the possibility of stacking filled cans permitting one on top of another, this invention shows a can end consisting of an outer cover hook, an chuck wall hanging from the inner surface of the chuck wall, and an annular protrusion An externally concave support extending radially inward from the envelope wall, and a central plate supported by the inner part of the supporting protrusion, characterized by the fact that the envelope wall is inclined towards an axis perpendicular to the outer surface of the central plate at an angle between 30 and 60, and the concave protrusion is less than 1.5 mm (0.060 in). It is preferable that the angle between the envelope wall and the vertical axis be between 40 and 45.

In one preferred embodiment of the case end, the outer wall of the supporting protrusion is reinforcing toward a line perpendicular to the center plate.

The central panel has an angle ranging between -15 and +15 and the height of the outer wall

Up to 2.5 mm.

General description of the invention:-

In one embodiment, the supporting protrusion has an inner portion parallel to the outer portion and connected to the hollow radial portion.

It is preferable that the ratio of the diameter of the central plate to the diameter of the outer circumference is 80% or less.

The can end may be made of a sheet consisting of a thin layer of thermopolymer and an aluminum alloy sheet, such as a PET film sheet over an aluminum manganese or iron alloy sheet, usually less than 0.010 (0.25 mm) thick for beverage containers. . A welding liner can be placed in the cover dogs

External.

Another aspect presented by this invention is the double seam process between the can body and the can end according to any of the previous elements. The aforementioned method includes the following steps:

Place the part wrapped around the end of the can on the flange of the can body fixed on a metal plate base, and place the chuck inside the wall of the chuck of the can end so that the can end is centered on the flange of the can body, where the aforementioned end device includes a moving conical surface with an inclination equal to the wall of the chuck at the end of the can and a cylindrical surface part. It extends away from the moving surface inside the envelope wall, causing a relative movement between the tip of the can and the body of the can, where the first welding process cylinder completes the first welding process, and then there is a relative movement between the welding that was completed in the first welding process and the cylinder. Second welding process

To complete a double welding process, during these two processes the wall of the chuck is raised to touch the cylindrical part of the machine chuck.

Explanation of shapes and drawings:-

The following is a description of the different models through examples, with reference to the accompanying illustrations, as follows:

Figure (1) A schematic drawing of a well-known double welding device.

Figure (2) An enlarged cross-sectional side view of a known chuck and a can end before operation

welding;

Figure (3) a cross-sectional view of part of a well-known double welding process;

Figure (4) a cross-sectional side view of the tip of a can according to this invention before the edge;

Figure (5): A cross-sectional side view of the tip of the can shown in Figure (4) placed on the body of the can before completing the double welding process.

Figure (6): A diagram showing the tip of the can and the body of the can during the first welding process.

Figure (7): A diagram showing the tip of the can and the body of the can during the second and final welding process to complete the double welding process.

Figure (8) Partial section of the envelope and the envelope wall;

Figure (9): A side view of the metal cans stacked on top of each other.

Detailed description:-

In Figure 1, the double welding device includes a base plate 1, a stand 2, and a plate

Alia 3.

The lever 4 installed in the base plate can be moved towards or away from the chuck 5 installed in the upper plate. The upper plate includes a cylinder 6 of the first welding process, which is mounted on an arm 7 that allows it to be moved axially toward or away from the envelope. The upper plate also includes a cylinder 8 of the second welding process, which is mounted on an arm 9 that allows it to be moved.

In the direction of the chuck and away from it, where its role comes after the relative movement between the first welding process cylinder and the tip of the can installed on the chuck leads to the completion of the first welding process.

As shown in Figure (1), the chuck 5 secures the tip of the can 10 well to the flange 11 of the body of the can 12, which in turn is mounted opposite the jack plate 4. Cylinder 6 also clearly shows the first welding process and Cylinder 7 the second welding process of the envelope before starting the welding process for each of the two cylinders in their turn to complete the process of bending the tip of the can and the flange of the can body in the double welding process as in Figure (3).

Figure (2) is an enlarged drawing showing the chuck 5 and the end of the case 10. The end of the case includes an outer wraparound bend 13, a chuck wall 14 overhanging the inner surface of the bend, and an externally concave supporting protrusion 15 extending inward from the chuck wall to support the central plate 16. It expands The envelope wall gradually moves outward from the vertical axis at an angle C ranging between 12 and 15.

The chuck 5 includes a chuck body 17 and has a grooved cylindrical cavity 18 that allows the remaining portion of the device to be installed (not shown). An annular protrusion 19 protrudes from the chuck body 17, forming a cavity with the end surface of the body to receive the central plate 16 of the case end. The center plate 16 can be mounted in the ring 19 freely between a wall

The plate and the envelope.

The outer surface of the protruding protrusion 19 extends upward toward the chuck body at an obtuse angle B of about 12 from the vertical axis to connect with the outer surface of the chuck body 17, which tapers at an angle A of about 4 in the direction of a vertical axis perpendicular to the central plate. The outer wall of the chuck contacts the chuck wall at a low position marked with the letter &D& in the part that is inclined at an angle of 12 to the protrusion of the chuck 15.

To develop a case end with a narrower supporting protrusion, the chuck 19's protrusion became narrower and more susceptible to breakage. There is also a risk of rubbing the tip of the can at position 5, which can leave unsightly and unacceptable black marks after the pasteurization process.

Figure (3) shows a section of a standard double welding process, showing the desired overlap of the 21 body pin and the 20 can tip between the 10 can tip and the can 12 body.

Figure 4 shows a can end, according to this invention, comprising an outer cover dog 23, an chuck wall 24, extending axially and inward from the inner surface of the outer cover dog, an externally concave supporting protrusion 25 that extends radially inward from the chuck wall, and a center plate. 26 Supported by an internal part 27. The plate wall is in an upright position that allows the metal to return to its original position after any pressure. The wall of the envelope is inclined towards

an axis perpendicular to the outer surface of the central plate at an angle C1 between 20 and 60;

Preferably between 40 and 45. It is usually half the cross-sectional diameter of the supporting bulge

About 0.5 mm.

The supporting protrusion 25 should preferably be parallel-sided, however the outer wall can be inclined towards a line perpendicular to the central plate at an angle between -15 and +15 and the height h1 of the outer wall can reach up to 2.5 mm.

It is preferable to make this end of the box from a sheet of metal plate and a polymeric coating. It is also preferable that the plate include a plate of aluminum magnesium alloy, such as a plate of alloy 5182 or aluminum manganese 3004, covered with a thin layer of polyester on one side. A thin layer of polypropylene can also be used on the other side. The typical dimensions of the example used in the invention are as follows:

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From the previous dimensions, it can be concluded that the ratio between the diameter of the central plate, 47.24 mm, to the total diameter of the case end, 65.84, is about 0.72 to 1.

For cost saving purposes, the aluminum alloy is made into sheet metal less than 0.010 inch (0.25 mm). The polyester layer covering the metal panel is usually 0.0005 inches (0.0125 mm).

Although this example shows that the overall height h2 is 6.86 mm, we also found that good examples of the case end can be made with an overall height of less than this, up to 6.35 mm (0.25

inch).

Figure No. (5) shows the outer lip 23 of the tip of the can 22 shown in Figure No. (4) installed on the flange 11 of the body of the can 12 before completing the double welding process, as we explained by referring to Figure No. (1).

In Figure No. (5), the modified chuck 30 includes the chuck body 31 and has a movable conical surface 32 that interfaces with the wall of the chuck 34 for the end of the can 22.

The conical moving surface tilts outward axially at an angle equal to the inclination angle C between 20 and 60. In this particular example, it is preferable for the envelope angle C to be 43. The moving surface 32 is slightly shorter than the chuck wall 24 by the chuck body. The part of the cylindrical surface 33, which is above the moving surface 32, can be inclined at an angle between 40 and -4 towards the longitudinal axis of the chuck. As shown in Figure No. (2), this modified chuck 30 has a slot that is drilled to allow the installation of the remaining part of the double welding machine (not shown).

In contrast to the chuck shown in Figure (2), the modified chuck 30 is designed to initially deal with the relatively large wall of the chuck 32 without entering a deep space within the supporting protrusion 25. There is another connection at the point where the chuck wall 32 meets the cylindrical wall 33, where the chuck wall is formed for the end of the can during the first and second welding processes, Figures (6) and (7). Envelope 30 shown in Figure No. (5) has a circular protrusion with a curved section, but this protrusion is designed to enter the wall of the envelope without causing a scratch or friction with the paint on the surface of the tip of the can. Or deal with the concave extrusion surface

As shown in Figure No. (2).

It is clear that the first welding process is carried out using a device as we previously mentioned

Referring to Figure No. (1).

Figure No. 6 shows the modified chuck and can end during the first welding process shown on the left of Figure No. (2), where we use the first welding cylinder 34 near the bent outer lip of the can end and the flange 11 of the can body 12.

During the relative rotation process between the can end 22 and the first welding cylinder 34, the boundary between the movable chuck wall 32 and the cylindrical wall 33 exerts a compressive force between the chuck 30 and the cylinder 34 to form the chuck wall at the can end as shown.

After completing the first welding process, the first welding cylinder rotates on its axis away from the welding area of the first process and the second welding cylinder 38 moves axially inward to support the first welding process fixed on the chuck 30. The relative rotational movement between the second welding cylinder 38 and the first process weld fixed on the envelope wall 30 completes the double welding process, as shown in Figure (7), so it tightly joins the upper part 24 of the envelope wall 24 with the neck of the can body in a horizontal position, where the double welding takes place. By pressure between the second process cylinder 38 and the chuck 30.

According to the invention, the case end models are made of 5182 aluminum alloy and 3004 aluminum alloy/polymer sheet sold by Carnode Metalbox Company.

CarnaudMetalbox under the ALULITE brand. Each of the can end models was installed by double welding to the can bodies that were drawn and unfolded. The installation process was carried out using different angles of the envelope and the envelope wall, as shown in Table No. (1), which lists the maximum internal pressure that the can end can withstand:

<img file="SA1289B1_D0003.tif" />

<img file="SA1289B1_D0004.tif" />

All pressure values listed are calculated in bar (psi) for new cans. 5182 is a manganese-magnesium-aluminum alloy. The allolite used is an aluminum alloy plate and a thin layer of polyester.

The results presented in Table 1 show that the can tip model was indeed useful in sealing cans with relatively low pressure. It is also noted that installing the double weld with the “D” weld ring improved the pressure retention process. Further tests were also conducted using an angle between the chuck wall and the moving chuck surface of about 45. Table No. (2) shows the improvements observed as a result of this process:

<img file="SA1289B1_D0005.tif" />

Table No. (2) is based on observations recorded regarding case end models made of aluminum coated with a thin layer of polymer (alolite) to obtain an envelope wall length of 5.029 mm (0.198 in) with a slope of 43.

It is noted that the vascular pressures obtained in samples J, K, and L recorded 4.89 bar (70.9 psi), 4.83 bar (70.0 psi), and 4.74 bar. (68.7 psi) respectively has been greatly improved by sealing using double welding.

To enhance the weld strength without using the tension ring, modified envelopes were used in which the inclination angle C was about 43 and the inclination of the cylindrical surface 33 generally ranged between +4 and -4. Table No. (3) shows these results.

<img file="SA1289B1_D0006.tif" />

All pressure values are in bar (psi) All codes

Improvement liner diameter 47.24 mm (1.860 in) (202 diameter).

6.86 mm (0.270 in) unit depth h2 2.39 mm (0.094 in) plate depth

Table No. (3) shows that the sample code &amp;O&amp; is made of 0.25 mm allolite and recorded 6.62 bar (95 psi) in the pressure test result, which indicates that the can tip is suitable for pressurized beverages. Other models of envelopes with different slope lengths were also tried, as shown in Table (4).

<img file="SA1289B1_D0007.tif" />

All pressure values are calculated in bar (psi) code

7=0.25 mm allolite, 47.24 mm (1.860 in) improvement liner, 6.86 mm (0.270 in) h2 depth, 2.38 mm (0.094 in) plate; Depth h2 = 2.29 mm (0.09 in)

8=0.23 mm ALULITE, 47.24 mm (1.860 in.) improvement liner, 7.11 mm (0.280 in.) depth h2, 2.64 mm (0.104 in.) plate; Depth h4 = 2.54 mm (0.10 in)

9=0.23 mm ALULITE 47.24 mm (1.860 in) improvement liner,

7.37 mm (0.290 in) depth, 2.90 mm (0.114 in) board; h4 depth

= 2.79 mm (0.11 inch)

Table No. (4) shows the results of optimizing the setting of the welding chuck values to approximate the pressure resistance for the two double welding processes with and without the use of the tension ring.

The table provides the overall length values of the vertical cylindrical surface 33 attached to the welding chuck 30, and also displays the positional relationship between the chuck wall 24 of the can end and the final double weld. It is clear from Figure (7) that the forces generated by heat treatment or products saturated with carbon dioxide are directed towards the resistor through the stronger parts of the final double weld.

Table No. 5 shows the results obtained from a typical welding chuck designed to provide a double-spent weld with the values and relationships shown in Table No. (4). As shown in Figure No. (8), a typical chuck consists of a cylindrical surface with a length of &amp;1&amp;1.9 mm (0.075 inches) and a moving conical surface 32 inclined at an angle Y of 43 towards the cylinder to which it is connected via a radius R of 0.5 mm ( 0.020 inch). The angle &amp;X&amp; is usually 90 degrees.

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<img file="SA1289B1_D0009.tif" />

All variant models are made of ALULITE; 10 boxes for each model.

The cost of making a can end can be saved by making it from thinner sheets of metal if pressure retention requirements permit, as these can end models feature relatively small center plates in stiffer rings.

Figure No. (9) shows a box 12a, closed in accordance with this invention, stacked on top of a similar box 12b, its cross-section shown such that the protrusion 31a of the upper box rests within the wall of the chuck 24 of the lower box and such that the bottom of the upper box rests above the double weld 34 of the end of the lower box.

The space between the bottom of the upper can body and the lower can end can be used to place a tension ring (not shown) at the end of the can or other additions such as placing a coiled suction tube or guide signs.

Using the experimental data mentioned above, a computer program was created to estimate the resistance of the can tip to pressure when attached to the can containing the compressed syrup. The last two entries in the following table relate to the tip of the drink can, which is known to have a diameter of 206 and the value mentioned in Kraska’s patent, as far as we know.

<img file="SA1289B1_D0010.tif" />

<img file="SA1289B1_D0011.tif" />

All experiments were designed based on a hypothetical aluminum alloy with a strength of 310 MPa and a thickness of 0.25 mm. The value of the standard model also reached 310 MPa, but with a thickness of 0.275 mm.