APPARATUS FOR SEALING UPPER CLOSURE COVERS OF CONTAINERS

United States Patent 3660965

A method of and apparatus for sealing containers for food products, comprising the steps of and means, respectively, simultaneously effecting the sealing of the peripheral zone of the cover on a corresponding flange of the neck of the container and effectively cooling the remainder of the surface of the closure cover, to obtain a pore-free hermetically tight closure.

04/856014

05/09/1972

09/08/1969

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Alimentas Ibericos S.A. (Barcelona, ES)

53/329.3

53/478, 156/282, 156/498

B23K31/02; B29C65/00; B29C65/18; B29C65/78; B65B7/28; B29C35/16; (IPC1-7): B65B7/28

53/30,42,39,184,287,300,329,373 156

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3555769

N/A

January 1971

Sternau

Spruill, Robert L.

I claim

1. An apparatus for sealing a circular closure cover onto a container having a flat annular flange, defining an open end of the container, comprising

2. An apparatus for sealing a circular closure onto a container having a flat annular flange, defining an open end of the container, comprising

3. The apparatus, as set forth in claim 1, wherein

4. The apparatus, as set forth in claim 1, wherein

5. The apparatus, as set forth in claim 4, wherein

The present invention relates to a process of and apparatus for sealing upper closure covers of containers for food products.

As is known, there has been a considerable increase in the use of hermetically sealed plastic containers for containing food products of various types, including vegetable products, such as olives and the like. It is essential in the processing of these products to obtain a hermetic closure of the container after it has been filled with the food product in order to avoid the harmful effect of the ambient air. For this purpose various closure methods have been used in order to attempt in all cases a perfect isolation from the surrounding air.

However, many of the methods presently known suffer defects, since a perfect hermetic closure is not absolutely guaranteed, and consequently in certain cases the food products spoil. In other cases the high resultant cost of the known methods has a substantial effect on the marketing of the product.

It is an object of the present invention to provide a very high quality closure of the container cover, as well as a substantial reduction in cost, which can be applied in particular to systems of closing containers of food products and which comprises the sealing of an upper closure cover on the edges of the container proper. In this case the covers are customarily of a different material than that of the container, covers made from a thin aluminum sheet being frequently employed.

It is another object of the present invention to provide a sealing closure cover which overcomes the heretofore substantial drawbacks which frequently occur in the known sealing of covers on containers when there are pores present, as is very frequent upon use of covers of such type which consist of very thin sheets of aluminum sealed to the edges of the receptacle or container which is to contain the food products.

It is yet another object of the present invention to provide a method of and apparatus for sealing containers whereby there is simultaneously sealed onto the neck of the container, a peripheral annular rim of a cover closure sheet and the rest of the cover plate is cooled. There is necessarily provided a means for producing these effects simultaneously upon the sealing of the cover to the neck of the container.

It is yet still another object of the present invention to provide an apparatus for sealing containers comprising a hollow, cylindrical body having electric heating resistors therein and having a lower edge, the surface of which coincides with that of an annular rim to be sealed. An inner core is mounted within the hollow cylindrical body having a lower surface substantially flush with the lower edge of the cylindrical body and having as an essential feature an internal cooling means which may comprise especially a means for the forced circulation of water. By this combination the result is obtained that simultaneously with the sealing of a circular rim on the periphery of the preferably metal cover, the rest of the surface of the metal cover is subjected to the cooling resulting from the internal cooling means constituting the inner assembly.

It is yet still another object of the present invention to provide an apparatus for sealing containers in accordance with the above-mentioned objectives and further comprising two arched parts which are moved over a plane perpendicular to the axis of the container and which come into coincidence below the flange of the container which is desired to be sealed. The arched parts when so positioned together cooperate with a sealing device. The advance and withdrawal of the arched parts can easily be mechanized, thereby generally mechanizing the operation of the apparatus of the present invention.

With these and other objects in view which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

FIG. 1 is an axial cross-sectional view of the arrangement of means for effecting the sealing of the mouth of a container;

FIG. 2 is a plan view of the structure of FIG. 1;

FIG. 3 is a section along the lines 4--4 of FIG. 4, partially broken away;

FIG. 4 is a top plan view of the closed container, partially broken away;

FIG. 5 is a section along the lines 5--5 of FIG. 6; and

FIG. 6 is a plan view of another embodiment of the present invention illustrating a sealing unit with circumferential heating resistors.

Referring now to the drawings, and more particularly to FIGS. 1 - 4, it is essential in the present invention to effect the sealing of an essentially metal cover 1, of reduced thickness onto an upper flange 2 having the shape of an outwardly directed annular shoulder which forms part of a container 3 made preferably of synthetic material, and particularly thermoplastic material, or the like, intended to contain food products therewithin. In order to effect the sealing a hollow cylindrical member 4 of annular cross-section is provided which has a flat annular bottom surface 4a of a width desired for the sealing of the cover 1 and the shoulder of the flange 2, and substantially of the same shape and size as that of the annular flange 2, the annular member 4 having a vertical projection corresponding to a circular rim. The member 4 has on its inside, in its cylindrical walls, independent heating elements, such as resistors, housed in cavities 5, the latter having a shape complementary to the shape of the resistors.

A cooling device is provided, essential to the present invention, which can substantially maintain the thermal equilibrium of a portion of the cover 1, which portion is limited or bounded at its outermost periphery by the annular sealing zone, for which purpose, in accordance with the present invention, there can be provided a cylindrical core or cooling member 6 housed within the hollow member 4 and having a flat lower closed circular surface 7 substantially abuttingly flush with and in the same plane as the annular bottom surface 4a of the member 4, whereby, by direct contact, the refrigeration or cooling of the cover 1 is facilitated. The cooling member 6 includes refrigeration or cooling means which are represented, although not limited thereto, by two tubes 8 and 9 for the entrance and discharge of cooling water, respectively, and an intermediate partition 10 defining a lower refrigerant chamber 11 adjacent the closed circular surface 7.

For the operation to be carried out in accordance with the present invention, there are provided two complementary clamping and supporting parts 12 and 13 (FIGS. 1 and 2), which are formed with semicircular arcuate recesses 14 and 15 such that when they are moved so that they abut each other, they form a circular central opening complementary to and surounding the zone of the neck of the container 3 adjacent and below the flange 2 on which the cover of the container is sealed. In this manner it is possible to mechanize the entire positioning, as well as, removal of the container before and after the sealing and the bringing together of the parts 12 and 13, so that the flange 2 can rest thereupon and can therefore resist the pressure of the sealing element 4.

For the mechanization of the movement, a longitudinal guiding of the parts 12 and 13 may be provided, the actuation thereof effected by means of individual rollers 16 and 17, whereby, by the cooperation of the parts with suitable outer guides 12a and 13a, preferably of a machine, the desired displacement of the parts can be effected. In this manner it is possible to establish with great ease, a means for completely mechanizing the sealing of the containers, the parts 12 and 13 moving via the guide means until coinciding with the sealing zone at which position the parts 12 and 13 are surrounding the neck of each container as illustrated in FIG. 2 After the sealing is effected, the parts 12 and 13 are immediately withdrawn, leaving the container free, so that the container can be removed by ordinary mechanical means.

Referring now again to the drawings, and more particularly to FIGS. 5 and 6 another embodiment of the present invention is illustrated in which a sealing member 18 effects the sealing and has the shape of a hollow cylindrical element. The member 18 has a group of inner resistors 19 which are disposed traversely or circumferentially and contain a cooling element 20 which has internal passageways 21 and 22 for the passage of a refrigerant fluid, which may be water, or any other coolant. Furthermore, two parts of half-moon 23 and 24 assure the sealing operation upon a displacement toward each other by means of guide members 23a and 24a of the machine, via rollers 25 and 26.

While I have disclosed several embodiments of the present invention, it is to be understood that these embodiments are given by example only and not in a limiting sense.