KR20110136785A - Process for closing a container in metal sheet - Google Patents

Abstract

The vessel is a tube having an upper end 10a and a lower side end 10b having an upper end 10a and a lower end 10b forming an upper retaining hook 11 and a lower retaining hook 12 in which the lower end wall 30 is double seamed. It has a shape (C). The upper end wall 20 has a periphery representing an end edge 22c which forms an inverted U-shaped upper sealed hook 23 to be seated on the upper holding hook 11 via an elastic sealing element 40 therebetween. It is matched so that the upper skirt part 22 may be provided. The upper sealing hook 23 and the upper holding hook 11 and a part of the peripheral upper skirt 22 and the corresponding area of the upper end 10a seam the upper sealing hook 23 on the upper holding hook 11. The retaining ribs 24 and the retaining grooves 14 which tightly sandwich the retaining ribs 24 are deformed, respectively.

Description

PROCESS FOR CLOSING A CONTAINER IN METAL SHEET}

The present invention seals the upper side of a container formed of a metal plate, such as a sealing bucket or other container, including a perimeter sidewall and having a cylindrical or inverted or slightly truncated conical shape and representing the upper and lower ends to which each end wall is attached. It is about how to.

Containers of the type contemplated here have upper and lower end walls double seamed along the circumference, respectively, at the upper and lower ends of the peripheral side wall, the upper end wall having an eccentric opening having an appearance substantially smaller than the peripheral side wall. And a gripping handle contained within the axial protrusion of the outer shape of the container so as to be lifted by the gripping handle attached only to the upper end wall. The opening provided in the upper end wall is generally configured to form a sheet to which a lid formed of a plastic material is applied.

Because of the complexity of the double seam process, which requires the use of special and generally expensive equipment, this double seam step in the manufacture of the containers under consideration here is rarely carried out in product filling facilities.

The containers are thus double seamed on the peripheral side wall of the container and then transported to the manufacturer's facility for sealing the product to be commercialized and sealed at the manufacturer's facility. Containers should be stacked side by side in line with transport and storage at the container manufacturer and filling facility as one container cannot be fitted inside the other because the end walls are already double seamed to the peripheral side wall. There is a need for physical space that represents an undesirably large volume with respect to the amount of material, which significantly increases transportation and storage costs and requires special care in transporting these containers.

Another drawback of these containers supplied for filling operation with the end wall already attached by double seams arises from the fact that filling is possible only through small openings provided in the upper end wall. Therefore, the time for filling the product is longer than the filling time performed without the upper end wall, since the upper part is sealed with a removable lid to fill the container provided with a suspension handle applied to the peripheral side wall instead of being applied to the lid. .

In order to overcome the above inconvenience, a constructive solution of the "metal plate container" of the Brazilian patent application PI 0804305-1 filed by the applicant on September 10, 2008 was proposed. In this conventional solution, the upper end wall can be easily, quickly, securely and securely attached to the peripheral side wall of the container by the charger of the product without the need for double seam operation.

According to the above conventional constructive solution of the same applicant, the upper peripheral edge of the peripheral side wall and the outer peripheral edge of the upper wall are combined so that they are securely and sealed to each other through a simple and simultaneous deformation operation to be performed by the charger. This is generally accomplished by an elastic sealing element in the form of a compressed gasket between the peripheral side wall and the modified edge of the upper wall.

In the case of the application requiring a large axial holding force between the upper side wall provided with the suspension handle and the peripheral side wall of the container, the upper peripheral skirt portion of the upper end of the container and the upper end wall is provided with one or more circumferential ribs and grooves. They interact with each other when the upper end wall is fitted inside the upper end of the peripheral side wall.

Providing circumferential ribs and grooves significantly increases the axial holding force of the upper end wall and the sealability of the upper closure of the container, but these ribs and grooves are separately separated by the container manufacturer from the skirt of the upper end wall and the peripheral side wall of the container. In order to combine them in the final closure of the container, undesirable dimensional precision is required in the manufacture of both parts in order to obtain the desired degree of axial holding force and further sealing. This conventional solution provides the advantages mentioned in the prior patent application of the same applicant but has the disadvantage of requiring an expensive manufacturing process.

Because of the inconveniences mentioned above in connection with the conventional solutions, the object of the present invention is to provide a quick and easy access to the peripheral sidewalls by means of a charger of the product to be packaged and equipped with a peripheral sidewall, a lower end wall, and a small outlet and suspension handle. It is to provide a method of sealing a metal plate container having an upper end wall that can be securely attached in a sealed state without the need for expensive operation or double seam operation to join the peripheral side wall and the upper end wall with a small dimensional tolerance.

The method of the present invention is applied to sealing a metal plate container of the type comprising a tubular body formed by a peripheral side wall having an upper end and a lower end to which respective upper and lower end walls are attached.

According to the invention, the sealing method comprises the steps of forming a tubular body of a metal plate, in which the upper and lower ends are mated with the upper and lower ends to provide the upper retaining hooks and the lower retaining hooks which are generally double seamed to the lower end walls, respectively. Steps.

The upper end wall is mated with a metal plate to represent a peripheral upper skirt with the end edge bent to form the upper hermetic hook when the container is sealed at the top, emptied empty or already filled with the product.

The upper hermetic hook and the upper retaining hook and the peripheral upper skirt of the upper end wall and the upper end of the peripheral side wall are deformed together to seam the hooks when compressing the intermediate elastic sealing element, and at least one outer circumference of the peripheral upper skirt. Forming the respective inner circumferential retaining grooves at the upper ends of the directional retaining ribs and the peripheral sidewalls makes the retaining ribs tight.

The sealing method proposed by the present invention is sealed in the upper end wall without the need for expensive and complicated work of double seaming or preforming the retaining ribs and grooves with expensive dimensional tolerances that obstruct the manufacturer and increase the cost of these containers. It can be secured to the tubular body of the container.

Due to this proposed method, the container can be made without retaining ribs and grooves and conveyed for filling, while the upper end wall is still a separate part while the lower end wall is already properly double seamed into the tubular body.

In the above proposed solution, the entire cross section of the open upper end can still be used during filling, thus allowing simple and simultaneous axial and radial compression operations to deform the sealing hook and the upper retaining hook and simultaneously form circumferential ribs and grooves. This shortens the work time before the work of keeping each end wall in the interior of the peripheral side wall.

When the peripheral sidewalls are configured to taper continuously or stepwise from one end to the other, generally from the upper end to the lower end, the containers are without the upper wall and one is partially fitted inside the other to remain stacked. Since it can be stored and transported, it allows for significant savings in storage and transport volume until it is sealed in the filling facility and preferably after the filling operation.

The invention will now be described with reference to the accompanying drawings, which are given as examples of possible embodiments of the invention:
1 shows a top view of a container of the present invention with a peripheral sidewall showing a circular appearance;
FIG. 2 is a partial radial cross-sectional view of the vessel taken along line II-II of FIG. 1, showing an upper end wall and a lower end wall attached to a peripheral side wall; FIG.
3 is an enlarged exploded view of the area of FIG. 2 showing the upper end wall fitted to the upper end of the peripheral side wall, showing the shape of the components before placing the upper end wall on the peripheral side wall;
FIG. 4 shows the same view as FIG. 3 but with the upper end wall already seated on the peripheral side wall and temporarily held;
FIG. 5 shows a reduced side view of the container shown in FIG. 4 when a seaming device is applied to compress the closure hook and the upper retaining hook to form an axial retaining rib and groove; FIG.
FIG. 5A shows a view similar to FIG. 4, but with a seam device for simultaneously deforming the closure hook and the upper retaining hook and the peripheral upper skirt with the upper end of the peripheral side wall to form circumferential ribs and grooves to be tightly fitted to each other. Indicates to apply;
FIG. 6 shows a view similar to FIG. 5 but only a container; FIG.
7 shows a radial partial cross-sectional view of two containers constructed in accordance with the present invention with the upper end wall removed and partially fitted together.

The sealing method of the present invention is formed of a metal plate, generally a tin plate, having an arbitrary polygonal cross section, generally a circular cross section, and formed of a peripheral side wall 10, with each of the upper end wall 20 and the lower end wall 30 attached thereto. And a tubular body (C) having an upper end (10a) and a lower end (10b).

According to the present invention, after joining the metal plate portions to form the tubular body C, the tubular body is subjected to the work for joining the upper end 10a and the lower end 10b of the peripheral side wall 10.

The mating process of the upper end 10a is to provide the upper peripheral edge 10c into the upper end 10a, which is bent outwardly and downwardly to form an upper retaining hook 11 having a contour of a substantially inverted U shape. Is done.

In a preferred embodiment of the present invention, the upper retaining hook 11 has an inner side leg 11a, an arcuate foundation leg 11b and an inner side leg 11a formed by a part of the upper end 10a of the peripheral side wall 10. ) To match the outer side legs 11c of the shape gathering.

The mating process of the lower end 10b of the peripheral side wall 10 is made to provide a lower peripheral edge 10d bent outwardly to form the lower retaining hook 12, the lower retaining hook 12 being an example. For example, any known conventional structure capable of securing a mating peripheral edge of the lower end wall 30, which also has any conventional configuration of a metal sheet, can be represented by a double seam. The solution used to securely and securely attach the lower end wall 30 to the tubular body C is not a special feature of the method of the present invention and the fixing may be carried out at the manufacturer's facility in any suitable way.

After joining the tubular body C, the upper retaining hook 11 and the lower retaining hook 12, the peripheral edge of the lower end wall 30 is generally attached to the tubular body C by double seams.

In accordance with the formation of the tubular body (C) and the sealing of the lower end wall 30, the metal plate portion is joined to form the upper end wall 20 including the center panel 21. It has a known prior art stiff circumferential ridge and a peripheral upper skirt 22 projecting axially outward, and configured to fit tightly while interfering with the interior of the upper end 10a of the peripheral side wall 10. .

The peripheral upper skirt portion 22 has end edges 22c that are bent in the outward, downward and inward directions to form a sealing hook 23 having a contour in the form of an inverse U shape.

In a preferred form of illustration, the closure hook 23 has an inner side portion 23a, an arcuate base portion 23b, and an inner side portion formed by an upper portion of the peripheral upper skirt portion 22 of the upper end wall 20. It is matched so that it may show the outer side part 23c which has an end flange 23d which gathers about 23a and protrudes upwards inside.

According to the method of the present invention, the peripheral upper skirt portion 22 of the upper end wall 20 can be fitted and seated inside the upper end 10a of the peripheral side wall 10, wherein the container is empty or already Filled with the product, the fitting process is carried out by seating the sealing hook 23 on the upper retaining hook 11 to interpose an elastic sealing element 40 provided in advance between the hooks 23, 11 (Fig. 4, FIGS. 5A and 6).

In the solution shown in the figure, the process of fitting the sealing hook 23 over the upper retaining hook 11 is such that the elastic sealing element 40, for example a plastisol film, is arched with the arcuate base 23b. The arched base portion 23b of the closing hook is placed on the arched base leg 11b of the upper retaining hook 11 in a state disposed between the base legs 11b.

As shown, the resilient sealing element 40 preferably has an arcuate foundation leg of the upper retaining hook 11 when the upper end wall 20 is fitted and seated inside the upper end 10a of the peripheral side wall 10. It is applied underneath the arcuate base 23b of the closure hook 23 so that it can be seated with respect to 11b.

The exploded view of FIG. 3 shows the form of the parts before closing the container. In this step, the diameter of the free end edge of the outer side leg 11c of the upper retaining hook 11 is slightly smaller than the diameter of the free upper edge of the end flange 23d protruding upward and outward. Therefore, when the upper end wall 20 is seated in the state shown in Fig. 4, the both side parts are elastically deformed so that the end flange 23d is free end edge of the outer side leg 11c of the upper holding hook 11. Make sure it fits underneath.

In general, when the container is ready to be sealed with the upper end wall 20 already fitted into the interior of the upper end 10a of the peripheral side wall 10 after it has already been filled with the product to be packaged, the sealing hook 23 ) And the upper retaining hook 11 and a portion of the peripheral upper skirt 22 and the corresponding area of the upper end 10a are subjected to a co-deformation operation to seam the sealing hook 23 to the upper retaining hook 11. Compress the elastic sealing element 40 therebetween and further form at least one outer circumferential retaining rib 24 in the peripheral upper skirt portion 22 and one inner side in the upper end 10a of the peripheral side wall 10. A circumferential retaining groove 14 is further formed. The retaining rib 24 is tightly fitted into the retaining groove 14 so that the retaining rib 24 completely follows the inner contour of the retaining groove 14. Tubular bodies (C without special manufacturing precautions) ) And a tight and secure connection between the upper end wall (20).

The process of deforming the sealing hook 23 and the upper retaining hook 11 together includes the upper end 10a and the upper upper skirt of the peripheral side wall 10 to simultaneously form the retaining rib 24 and the retaining groove 14. This is achieved by applying radially inward and upward forces as opposed to applying radially outward forces with respect to (22).

In a preferred construction of the structure, the process of fitting the sealing hook 23 on the upper retaining hook 11 is such that the arcuate base 23b of the sealing hook 23 is placed on the arcuate foundation leg 11b of the upper retaining hook 11. The process of seaming the sealing hook 23 on the upper retaining hook 11 is performed by mounting the inner side portion 23a, the arcuate base portion 23b and the outer side portion 23c of the sealing hook 23, respectively. The elastic sealing element 40 is compressed by seating against the inner side leg 11a, the arched base leg 11b and the outer side leg 11c of the upper retaining hook 11 and the outer side leg of the upper retaining hook 11. It is made to have an end flange 23d projecting upward to the inside of the upper holding hook 11 between 11b and the inner side leg 11a.

As shown in FIGS. 5 and 5A, variations for seaming the hooks and forming retaining ribs 24 and retaining grooves 14 may include a plurality of outer peripheral fingers 51 and a plurality of inner peripheral fingers 52. It can be easily carried out after the filling of the product by the containing seam device 50, the outer peripheral finger 51 and the inner peripheral finger 52 is a circular alignment having a variable diameter according to the operation of the seam device 50 The seam deformation and retaining ribs 24 of the upper hermetic hook 23 and the upper retaining hook 11 are configured so that they form together and act simultaneously on the hook from the outer side of the container and on the peripheral upper skirt 22. And it is possible to achieve the formation of the retaining groove 14 at the same time. As can be seen in FIG. 5A, the outer peripheral finger 51 and the inner peripheral finger 52 have seams of the hooks on each of the parts on which they are seated and the upper end of the peripheral upper skirt 22 and the peripheral side walls 10 ( 10a) gives a desired mating process to achieve a fit between the tubular body C of the container and the upper end wall 20 to ensure a strong axial holding force between the sealing hook 23 and the upper retaining hook 11 And a sealing area in addition to that formed by the seam of the sealing hook 23 and the upper retaining hook 11 with the elastic sealing element 40 provided therein.

Further, as shown, after the deformation of the sealing hook 23 and the upper retaining hook 11 is completed, the outer side leg 11c of the upper retaining hook 11 and the outer side portion 23c of the sealing hook 23. Takes a substantially straight downward and radially inwardly inclined contour to ensure that the upper end wall 20 is firmly, firmly and tightly fixed to the peripheral sidewall 10.

Inner side leg 11a and sealing hook 23 of upper retaining hook 11 for the purpose of accommodating two parts to be fixed to each other and to facilitate the plastic deformation of the metal plate at the initial and final formation of the two hooks. The inner side surface portion 23a of the c) is initially matched to have a contour that is slightly inclined substantially upwardly and radially outward.

According to the shown embodiment, it is comprised so that it may show the cross section which has a round V shape of a convex arc and a concave arc, respectively.

According to the application feature of the elastic sealing element 40, as shown in Figure 5 is compressed and penetrated between the inner side leg (11a) of the upper retaining hook 11 and the inner side portion (23a) of the sealing hook 23 It may have a portion of the extension.

In consideration of the purpose of obtaining a seal capable of easily carrying out the structure of the container of the present invention and satisfying the safety conditions applied to the container for dangerous products, the peripheral side wall may be provided with energy absorbing means by controlled plastic deformation. Can be. Thus, the perimeter sidewall 10 is adjacent to the upper end 10a and the lower end 10b, respectively, and occupies about 10% to 15% of the height of the perimeter sidewall 10 and is a lying V-shaped with rounded vertices. It can represent two regions that coincide with a plurality of circumferential grooves 10e delineating. These areas exhibit a corrugated structure that is susceptible to deformation before the container is overly deformed in the area where the end walls 20, 30 are attached to the peripheral sidewall 10.

1 and 2, considering that the two upper end walls 10 and the lower end walls 30 are attached to the peripheral side wall 10 in a non-removable manner, the center of the upper end wall 20 The panel 21 has a small diameter generally eccentric opening 21a and a grip handle 60 located in the central area of the upper end wall 20, where the grip handle 60 is filled with a container. It is also integrally attached to the upper end wall 20 in order to be lifted by the grip handle (60). In this type of structure, the small diameter openings 21a are usually sealed with a removable lid (not shown), which preferably consists of a plastic material and does not form part of the present invention.

As already mentioned above and shown in FIG. 7 of the accompanying drawings, the peripheral sidewall 10 of the container may be configured to be partially stretchable between two overlapping containers. In the illustrated embodiment, the peripheral sidewall 10 has a slightly inverted, truncated cone shape, with the small underside coinciding with the lower end wall 30 and the large underside preferably mounted with the upper end wall 20. It is located on a surface spaced axially back relative to the surface, wherein the peripheral sidewall 10 is deformed to form an outer circumferential protrusion 19.

Due to this structure, the container can be stretched and fitted inside the container disposed below the other without the upper end wall, and this fitting process is performed by placing the outer circumferential protrusion 19 downward as shown in FIG. The containers thus stacked are seated on the free edge of the upper end 10a of the peripheral side wall 10 of the finished container until the occupied container occupies a total volume significantly less than the volume occupied by the same number of down and upper sealed containers stacked up and down. Is carried out. This partial fitting arrangement allows the containers to be greatly economical in volume and therefore cost and economical in storage.

Here, only one embodiment of the present invention is shown, but the sealing method of the present invention can be changed in the deformation characteristics of the accompanying components without departing from the configuration concept defined in the appended claims.

Claims (7)

A metal plate of the type comprising a tubular body C formed by a peripheral side wall 10 having an upper end 10a and a lower end 10b to which the upper end wall 20 and the lower end wall 30 are respectively attached. In a method of sealing a container:
Joining the metal plate portions to form a peripheral side wall 10 of the tubular body C;
Joining the peripheral side wall 10 to provide an upper peripheral edge 10c at its upper end 10a that is bent outwardly and downwardly to form an upper retaining hook 11 having an inverted U-shaped contour; Providing at its lower end a lower peripheral edge 10d bent to form a lower retaining hook 12;
Attaching the lower end wall 30 to the lower retaining hook 12 of the tubular body C peripherally;
Peripheral upper skirt portion 22 and center panel 21 showing end edges 22c that are bent in the outward, downward and inward directions to join the metal plate portions to form an upper closed hook 23 having an inverted U-shaped contour. Forming an upper end wall (20) having a diameter;
When the container is empty or already filled with the product, the peripheral upper skirt portion 22 is inserted into the upper end portion 10a so that the upper sealing hook 23 rests on the upper holding hook 11 so that the hook 23, 11) interposing an elastic sealing element 40 already provided therebetween; And
The upper sealing hook 23 and the upper retaining hook 11, and a part of the peripheral upper skirt portion 22 and the corresponding areas of the upper end 10a are simultaneously deformed to deform the upper sealing hook 23 to the upper holding hook 11 Seam on to compress the elastic sealing element 40 and at least one outer circumferential retaining rib 24 of the peripheral upper skirt 22 and a corresponding inner circumference of the upper end 10a of the peripheral side wall 10. Forming a directional retaining groove (14) to tightly fit the retaining rib (24). 2. The upper retaining hook (11) according to claim 1, wherein the upper retaining hooks (11) having an inverted U-shape outline are formed by a portion of the upper end portion (10a), an arcuate foundation leg (11b), and an inner side leg. The inner side hook portion 11c of the shape gathered with respect to 11a, and the upper closed hook 23 having an inverted U-shape outline is mated and formed by the upper portion of the peripheral upper skirt portion 22 ( 23a), an outer side surface portion 23c having a shape gathered with respect to the arcuate base portion 23b and the inner side surface portion 23a and having an upwardly projecting end flange 23d therein, and having an upper sealed hook 23 on the upper side. The process of fitting on the retaining hook 11 is performed by placing the arcuate base 23b of the upper hermetic hook 23 on the upper retaining hook 11 and between the arched base 23b and the arched base leg 11b. The elastic sealing element 40 is made to be arranged, the upper sealing hook (23) Seaming of the upper retaining hook 11 includes the inner side portion 23a, the arcuate base portion 23b, and the outer side portion 23c of the upper retaining hook 23, respectively. The elastic sealing element 40 is compressed by being seated on the leg 11a, the arched base leg 11b and the outer side leg 11c, and the outer side leg 11b and the inner side leg 11a of the upper retaining hook 11. And an end flange (23) projecting upwards to the inside of the upper retaining hook (11) therebetween. 3. The method of claim 2, wherein the deformation of the sealing hook (23) and the upper holding hook (11) is such that the peripheral upper skirt (22) and the peripheral side wall (10) to simultaneously form the holding rib (24) and the holding groove (14). A radial inward and upward force as opposed to applying a force radially outward with respect to the upper end (10a). The outer side leg 11c of the upper holding hook 11 and the outer side portion 23c of the upper hermetic hook 23 are respectively inclined in a substantially straight radially inner and lower direction. Characterized in that the method. 5. The inner side leg 11a of the upper retaining hook 11 and the inner side portion 23a of the upper hermetic hook 23 are each substantially linearly radially upper and And slightly inclined outwardly. 7. The elastic sealing element (40) according to claim 2, 3, 4, 5 or 6, wherein an extension portion of the elastic sealing element (40) is sealed upwardly with the inner side leg (11a) of the upper holding hook (11). And is compressed between the inner side portions (23a) of the hook (23). 7. The retaining ribs 24 and the retaining grooves 14 according to any one of claims 2, 3, 5 or 6 are formed by deforming the metal plates of the respective parts, and are substantially convex arc and concave circles. And a cross section having an arc-shaped round V shape.

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