Process for closing a container in metal sheet
a container and metal sheet technology, applied in the direction of containers, rigid containers, packaging, etc., can solve the problems of increasing shipping and storage costs, requiring special care to transport containers, and only carrying out filling, so as to reduce operation time and substantial economic benefits of storage and transportation volum
Inactive Publication Date: 2011-12-08
BRASILATA S A EMBALAGENS METALICAS
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- Summary
- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
[0016]In the proposed solution, the whole cross section of the still open upper end portion can be used during the filling, reducing the operation time before the operation of fitting and retaining the respective end wall in the interior of the peripheral lateral wall, by means of simple and concomitant axial and radial compression operations, to provide the deformation of both the closure hook and the upper retention hook and the concomitant formation of the circumferential rib and groove.
[0017]In case the peripheral lateral wall is constructed so as to taper from one end portion to the other, generally from the upper end portion to the lower end portion, in a continuous or stepped manner, the containers can be stored and shipped without the upper end wall and in a condition in which they remain partially fitted one inside the other in stacks, allowing a substantial economy in storage and transportation volume until they are closed at the filling facility and, preferably, after the filling operation.
Problems solved by technology
Due to the complexity of the double-seaming processes, which require the use of specific and generally expensive equipment, these double-seaming phases in the manufacture of the container considered herein are rarely carried out in the product filling facilities.
Since the containers are shipped with the end walls already double-seamed to the peripheral lateral wall, they cannot be fitted one inside the other, requiring to be arranged side-by-side and stacked in the transport vehicles and also in the storage places, both at the container manufacturer and at the filling facilities, requiring a physical space presenting an undesirable large volume in relation to the mass of the material, considerably increasing the shipping and storage costs and requiring special cares to transport these containers.
Another drawback of these containers supplied to the responsible for the filling operation with the end walls already attached, generally by double-seaming, results from the fact that the filling can be only carried out through the opening of reduced dimension provided in the upper end wall.
Although the provision of the circumferential ribs and grooves leads to a substantial increase in the degree of axial retention of the upper end wall, as well as in the degree of hermeticity in said upper closure of the container, these ribs and grooves are provided separately in the skirt of the upper end wall and in the peripheral lateral wall of the container, by the manufacturer of the latter, requiring an undesirable dimensional precision in the manufacture of the two parts, in order to allow fitting them at the final closure of the container and obtaining the desired degrees of axial retention and additional sealing.
This prior solution, although providing the advantages mentioned in said prior patent application of the same applicant, has the inconvenience of requiring costly manufacturing procedures.
Method used
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Embodiment Construction
[0027]The present closing process is applied to a container formed in metal sheet, usually tinplate, and comprising a tubular body C formed by a peripheral lateral wall 10, with any polygonal cross section, usually circular and having an upper end portion 10a and a lower end portion 10b, in which respective upper end wall 20 and lower end wall 30 are affixed.
[0028]According to the invention, after conforming a metal sheet portion to form the tubular body C, the latter is submitted to an operation for conforming the upper end portion 10a and lower end portion 10b of the peripheral lateral wall 10.
[0029]The conformation of the upper end portion 10a is made so as to provide, therein, an upper peripheral edge 10c which is outwardly and downwardly bent, defining an upper retention hook 11 with a profile in the spa approximate form of an inverted U.
[0030]In the preferred form of the invention, the upper retention hook 11 is conformed to present an inner lateral leg 11a defined by part of ...
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Abstract
The container has a tubular body having a peripheral lateral wall provided with an upper end portion and a lower end portion defining an upper retention hook and a lower retention hook to which is double-seamed a lower end wall. An upper end wall is conformed to incorporate a peripheral upper skirt presenting an end edge defining an inverted U shaped upper closure hook to be seated onto the upper retention hook sandwiching an elastic sealing element therebetween. The upper closure hook and the upper retention hook and also a portion of the peripheral upper skirt and a confronting region of the upper end portion are deformed for seaming the upper closure hook onto the upper retention hook and to form, respectively, a retention rib and a retention groove which tightly fits the retention rib.
Description
FIELD OF THE INVENTION[0001]The present invention refers to a process to provide the upper closure of a container formed in metal sheet, such as a closed pail or other container comprising a peripheral lateral wall, with a cylindrical form or an inverted and slightly frusto-conical form and presenting an upper end portion and a lower end portion, to which respective end walls are attached.PRIOR ART[0002]The containers of the type considered herein have their upper and lower end walls respectively and peripherally double-seamed in the upper end portion and lower end portion of the peripheral lateral wall, the upper end wall being provided with an a generally eccentric opening having a contour substantially smaller than that of the peripheral lateral wall, and with a gripping handle contained in the interior of the axial projection of the contour of the container, in order to allow the latter to be lifted by the gripping handle attached only to the upper end wall. The opening provided...
Claims
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IPC IPC(8): B21D51/30B21D51/32
CPCB21D51/2653B21D51/32B65D17/10B65D7/36B65B7/2857B21D51/26B65B7/28B65D43/02
InventorALVARES, ANTONIO CARLOS TEIXEIRACUNHA, SILVERIO CANDIDO DA
OwnerBRASILATA S A EMBALAGENS METALICAS